15872517631

Committed 25 Jun 2025 09:22AM UTC coverage: 67.648% (-0.2%) from 67.8%

Build # 15872517631

Build Type

Pull #9939

github

Committed by

web-flow

Commit Message

Merge e875183c4 into 33e6f2854

Pull Request Pull Request #9939: [15] graph/db: SQL prune log

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/graph/db/sql_store.go

package graphdb

import (
        "bytes"
        "context"
        "database/sql"
        "encoding/hex"
        "errors"
        "fmt"
        "maps"
        "math"
        "net"
        "slices"
        "strconv"
        "sync"
        "time"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/wire"
        "github.com/lightningnetwork/lnd/aliasmgr"
        "github.com/lightningnetwork/lnd/batch"
        "github.com/lightningnetwork/lnd/fn/v2"
        "github.com/lightningnetwork/lnd/graph/db/models"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/routing/route"
        "github.com/lightningnetwork/lnd/sqldb"
        "github.com/lightningnetwork/lnd/sqldb/sqlc"
        "github.com/lightningnetwork/lnd/tlv"
        "github.com/lightningnetwork/lnd/tor"
)

// pageSize is the limit for the number of records that can be returned
// in a paginated query. This can be tuned after some benchmarks.
const pageSize = 2000

// ProtocolVersion is an enum that defines the gossip protocol version of a
// message.
type ProtocolVersion uint8

const (
        // ProtocolV1 is the gossip protocol version defined in BOLT #7.
        ProtocolV1 ProtocolVersion = 1
)

// String returns a string representation of the protocol version.
func (v ProtocolVersion) String() string {
        return fmt.Sprintf("V%d", v)
}

// SQLQueries is a subset of the sqlc.Querier interface that can be used to
// execute queries against the SQL graph tables.
//
//nolint:ll,interfacebloat
type SQLQueries interface {
        /*
                Node queries.
        */
        UpsertNode(ctx context.Context, arg sqlc.UpsertNodeParams) (int64, error)
        GetNodeByPubKey(ctx context.Context, arg sqlc.GetNodeByPubKeyParams) (sqlc.Node, error)
        GetNodeIDByPubKey(ctx context.Context, arg sqlc.GetNodeIDByPubKeyParams) (int64, error)
        GetNodesByLastUpdateRange(ctx context.Context, arg sqlc.GetNodesByLastUpdateRangeParams) ([]sqlc.Node, error)
        ListNodesPaginated(ctx context.Context, arg sqlc.ListNodesPaginatedParams) ([]sqlc.Node, error)
        ListNodeIDsAndPubKeys(ctx context.Context, arg sqlc.ListNodeIDsAndPubKeysParams) ([]sqlc.ListNodeIDsAndPubKeysRow, error)
        IsPublicV1Node(ctx context.Context, pubKey []byte) (bool, error)
        GetUnconnectedNodes(ctx context.Context) ([]sqlc.GetUnconnectedNodesRow, error)
        DeleteNodeByPubKey(ctx context.Context, arg sqlc.DeleteNodeByPubKeyParams) (sql.Result, error)
        DeleteNode(ctx context.Context, id int64) error

        GetExtraNodeTypes(ctx context.Context, nodeID int64) ([]sqlc.NodeExtraType, error)
        UpsertNodeExtraType(ctx context.Context, arg sqlc.UpsertNodeExtraTypeParams) error
        DeleteExtraNodeType(ctx context.Context, arg sqlc.DeleteExtraNodeTypeParams) error

        InsertNodeAddress(ctx context.Context, arg sqlc.InsertNodeAddressParams) error
        GetNodeAddressesByPubKey(ctx context.Context, arg sqlc.GetNodeAddressesByPubKeyParams) ([]sqlc.GetNodeAddressesByPubKeyRow, error)
        DeleteNodeAddresses(ctx context.Context, nodeID int64) error

        InsertNodeFeature(ctx context.Context, arg sqlc.InsertNodeFeatureParams) error
        GetNodeFeatures(ctx context.Context, nodeID int64) ([]sqlc.NodeFeature, error)
        GetNodeFeaturesByPubKey(ctx context.Context, arg sqlc.GetNodeFeaturesByPubKeyParams) ([]int32, error)
        DeleteNodeFeature(ctx context.Context, arg sqlc.DeleteNodeFeatureParams) error

        /*
                Source node queries.
        */
        AddSourceNode(ctx context.Context, nodeID int64) error
        GetSourceNodesByVersion(ctx context.Context, version int16) ([]sqlc.GetSourceNodesByVersionRow, error)

        /*
                Channel queries.
        */
        CreateChannel(ctx context.Context, arg sqlc.CreateChannelParams) (int64, error)
        GetChannelBySCID(ctx context.Context, arg sqlc.GetChannelBySCIDParams) (sqlc.Channel, error)
        GetChannelByOutpoint(ctx context.Context, outpoint string) (sqlc.GetChannelByOutpointRow, error)
        GetChannelsBySCIDRange(ctx context.Context, arg sqlc.GetChannelsBySCIDRangeParams) ([]sqlc.GetChannelsBySCIDRangeRow, error)
        GetChannelBySCIDWithPolicies(ctx context.Context, arg sqlc.GetChannelBySCIDWithPoliciesParams) (sqlc.GetChannelBySCIDWithPoliciesRow, error)
        GetChannelAndNodesBySCID(ctx context.Context, arg sqlc.GetChannelAndNodesBySCIDParams) (sqlc.GetChannelAndNodesBySCIDRow, error)
        GetChannelFeaturesAndExtras(ctx context.Context, channelID int64) ([]sqlc.GetChannelFeaturesAndExtrasRow, error)
        HighestSCID(ctx context.Context, version int16) ([]byte, error)
        ListChannelsByNodeID(ctx context.Context, arg sqlc.ListChannelsByNodeIDParams) ([]sqlc.ListChannelsByNodeIDRow, error)
        ListChannelsWithPoliciesPaginated(ctx context.Context, arg sqlc.ListChannelsWithPoliciesPaginatedParams) ([]sqlc.ListChannelsWithPoliciesPaginatedRow, error)
        ListChannelsPaginated(ctx context.Context, arg sqlc.ListChannelsPaginatedParams) ([]sqlc.ListChannelsPaginatedRow, error)
        GetChannelsByPolicyLastUpdateRange(ctx context.Context, arg sqlc.GetChannelsByPolicyLastUpdateRangeParams) ([]sqlc.GetChannelsByPolicyLastUpdateRangeRow, error)
        GetChannelByOutpointWithPolicies(ctx context.Context, arg sqlc.GetChannelByOutpointWithPoliciesParams) (sqlc.GetChannelByOutpointWithPoliciesRow, error)
        GetPublicV1ChannelsBySCID(ctx context.Context, arg sqlc.GetPublicV1ChannelsBySCIDParams) ([]sqlc.Channel, error)
        GetSCIDByOutpoint(ctx context.Context, arg sqlc.GetSCIDByOutpointParams) ([]byte, error)
        DeleteChannel(ctx context.Context, id int64) error

        CreateChannelExtraType(ctx context.Context, arg sqlc.CreateChannelExtraTypeParams) error
        InsertChannelFeature(ctx context.Context, arg sqlc.InsertChannelFeatureParams) error

        /*
                Channel Policy table queries.
        */
        UpsertEdgePolicy(ctx context.Context, arg sqlc.UpsertEdgePolicyParams) (int64, error)
        GetChannelPolicyByChannelAndNode(ctx context.Context, arg sqlc.GetChannelPolicyByChannelAndNodeParams) (sqlc.ChannelPolicy, error)
        GetV1DisabledSCIDs(ctx context.Context) ([][]byte, error)

        InsertChanPolicyExtraType(ctx context.Context, arg sqlc.InsertChanPolicyExtraTypeParams) error
        GetChannelPolicyExtraTypes(ctx context.Context, arg sqlc.GetChannelPolicyExtraTypesParams) ([]sqlc.GetChannelPolicyExtraTypesRow, error)
        DeleteChannelPolicyExtraTypes(ctx context.Context, channelPolicyID int64) error

        /*
                Zombie index queries.
        */
        UpsertZombieChannel(ctx context.Context, arg sqlc.UpsertZombieChannelParams) error
        GetZombieChannel(ctx context.Context, arg sqlc.GetZombieChannelParams) (sqlc.ZombieChannel, error)
        CountZombieChannels(ctx context.Context, version int16) (int64, error)
        DeleteZombieChannel(ctx context.Context, arg sqlc.DeleteZombieChannelParams) (sql.Result, error)
        IsZombieChannel(ctx context.Context, arg sqlc.IsZombieChannelParams) (bool, error)

        /*
                Prune log table queries.
        */
        GetPruneTip(ctx context.Context) (sqlc.PruneLog, error)
        UpsertPruneLogEntry(ctx context.Context, arg sqlc.UpsertPruneLogEntryParams) error
        DeletePruneLogEntriesInRange(ctx context.Context, arg sqlc.DeletePruneLogEntriesInRangeParams) error
}

// BatchedSQLQueries is a version of SQLQueries that's capable of batched
// database operations.
type BatchedSQLQueries interface {
        SQLQueries
        sqldb.BatchedTx[SQLQueries]
}

// SQLStore is an implementation of the V1Store interface that uses a SQL
// database as the backend.
//
// NOTE: currently, this temporarily embeds the KVStore struct so that we can
// implement the V1Store interface incrementally. For any method not
// implemented,  things will fall back to the KVStore. This is ONLY the case
// for the time being while this struct is purely used in unit tests only.
type SQLStore struct {
        cfg *SQLStoreConfig
        db  BatchedSQLQueries

        // cacheMu guards all caches (rejectCache and chanCache). If
        // this mutex will be acquired at the same time as the DB mutex then
        // the cacheMu MUST be acquired first to prevent deadlock.
        cacheMu     sync.RWMutex
        rejectCache *rejectCache
        chanCache   *channelCache

        chanScheduler batch.Scheduler[SQLQueries]
        nodeScheduler batch.Scheduler[SQLQueries]

        srcNodes  map[ProtocolVersion]*srcNodeInfo
        srcNodeMu sync.Mutex

        // Temporary fall-back to the KVStore so that we can implement the
        // interface incrementally.
        *KVStore
}

// A compile-time assertion to ensure that SQLStore implements the V1Store
// interface.
var _ V1Store = (*SQLStore)(nil)

// SQLStoreConfig holds the configuration for the SQLStore.
type SQLStoreConfig struct {
        // ChainHash is the genesis hash for the chain that all the gossip
        // messages in this store are aimed at.
        ChainHash chainhash.Hash
}

// NewSQLStore creates a new SQLStore instance given an open BatchedSQLQueries
// storage backend.
func NewSQLStore(cfg *SQLStoreConfig, db BatchedSQLQueries, kvStore *KVStore,
        options ...StoreOptionModifier) (*SQLStore, error) {

        opts := DefaultOptions()
        for _, o := range options {
                o(opts)
        }

        if opts.NoMigration {
                return nil, fmt.Errorf("the NoMigration option is not yet " +
                        "supported for SQL stores")
        }

        s := &SQLStore{
                cfg:         cfg,
                db:          db,
                KVStore:     kvStore,
                rejectCache: newRejectCache(opts.RejectCacheSize),
                chanCache:   newChannelCache(opts.ChannelCacheSize),
                srcNodes:    make(map[ProtocolVersion]*srcNodeInfo),
        }

        s.chanScheduler = batch.NewTimeScheduler(
                db, &s.cacheMu, opts.BatchCommitInterval,
        )
        s.nodeScheduler = batch.NewTimeScheduler(
                db, nil, opts.BatchCommitInterval,
        )

        return s, nil
}

// AddLightningNode adds a vertex/node to the graph database. If the node is not
// in the database from before, this will add a new, unconnected one to the
// graph. If it is present from before, this will update that node's
// information.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) AddLightningNode(ctx context.Context,
        node *models.LightningNode, opts ...batch.SchedulerOption) error {

        r := &batch.Request[SQLQueries]{
                Opts: batch.NewSchedulerOptions(opts...),
                Do: func(queries SQLQueries) error {
                        _, err := upsertNode(ctx, queries, node)
                        return err
                },
        }

        return s.nodeScheduler.Execute(ctx, r)
}

// FetchLightningNode attempts to look up a target node by its identity public
// key. If the node isn't found in the database, then ErrGraphNodeNotFound is
// returned.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) FetchLightningNode(ctx context.Context,
        pubKey route.Vertex) (*models.LightningNode, error) {

        var node *models.LightningNode
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var err error
                _, node, err = getNodeByPubKey(ctx, db, pubKey)

                return err
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch node: %w", err)
        }

        return node, nil
}

// HasLightningNode determines if the graph has a vertex identified by the
// target node identity public key. If the node exists in the database, a
// timestamp of when the data for the node was lasted updated is returned along
// with a true boolean. Otherwise, an empty time.Time is returned with a false
// boolean.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) HasLightningNode(ctx context.Context,
        pubKey [33]byte) (time.Time, bool, error) {

        var (
                exists     bool
                lastUpdate time.Time
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbNode, err := db.GetNodeByPubKey(
                        ctx, sqlc.GetNodeByPubKeyParams{
                                Version: int16(ProtocolV1),
                                PubKey:  pubKey[:],
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return nil
                } else if err != nil {
                        return fmt.Errorf("unable to fetch node: %w", err)
                }

                exists = true

                if dbNode.LastUpdate.Valid {
                        lastUpdate = time.Unix(dbNode.LastUpdate.Int64, 0)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return time.Time{}, false,
                        fmt.Errorf("unable to fetch node: %w", err)
        }

        return lastUpdate, exists, nil
}

// AddrsForNode returns all known addresses for the target node public key
// that the graph DB is aware of. The returned boolean indicates if the
// given node is unknown to the graph DB or not.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) AddrsForNode(ctx context.Context,
        nodePub *btcec.PublicKey) (bool, []net.Addr, error) {

        var (
                addresses []net.Addr
                known     bool
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var err error
                known, addresses, err = getNodeAddresses(
                        ctx, db, nodePub.SerializeCompressed(),
                )
                if err != nil {
                        return fmt.Errorf("unable to fetch node addresses: %w",
                                err)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return false, nil, fmt.Errorf("unable to get addresses for "+
                        "node(%x): %w", nodePub.SerializeCompressed(), err)
        }

        return known, addresses, nil
}

// DeleteLightningNode starts a new database transaction to remove a vertex/node
// from the database according to the node's public key.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) DeleteLightningNode(ctx context.Context,
        pubKey route.Vertex) error {

        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                res, err := db.DeleteNodeByPubKey(
                        ctx, sqlc.DeleteNodeByPubKeyParams{
                                Version: int16(ProtocolV1),
                                PubKey:  pubKey[:],
                        },
                )
                if err != nil {
                        return err
                }

                rows, err := res.RowsAffected()
                if err != nil {
                        return err
                }

                if rows == 0 {
                        return ErrGraphNodeNotFound
                } else if rows > 1 {
                        return fmt.Errorf("deleted %d rows, expected 1", rows)
                }

                return err
        }, sqldb.NoOpReset)
        if err != nil {
                return fmt.Errorf("unable to delete node: %w", err)
        }

        return nil
}

// FetchNodeFeatures returns the features of the given node. If no features are
// known for the node, an empty feature vector is returned.
//
// NOTE: this is part of the graphdb.NodeTraverser interface.
func (s *SQLStore) FetchNodeFeatures(nodePub route.Vertex) (
        *lnwire.FeatureVector, error) {

        ctx := context.TODO()

        return fetchNodeFeatures(ctx, s.db, nodePub)
}

// DisabledChannelIDs returns the channel ids of disabled channels.
// A channel is disabled when two of the associated ChanelEdgePolicies
// have their disabled bit on.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) DisabledChannelIDs() ([]uint64, error) {
        var (
                ctx     = context.TODO()
                chanIDs []uint64
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbChanIDs, err := db.GetV1DisabledSCIDs(ctx)
                if err != nil {
                        return fmt.Errorf("unable to fetch disabled "+
                                "channels: %w", err)
                }

                chanIDs = fn.Map(dbChanIDs, byteOrder.Uint64)

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch disabled channels: %w",
                        err)
        }

        return chanIDs, nil
}

// LookupAlias attempts to return the alias as advertised by the target node.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) LookupAlias(ctx context.Context,
        pub *btcec.PublicKey) (string, error) {

        var alias string
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbNode, err := db.GetNodeByPubKey(
                        ctx, sqlc.GetNodeByPubKeyParams{
                                Version: int16(ProtocolV1),
                                PubKey:  pub.SerializeCompressed(),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return ErrNodeAliasNotFound
                } else if err != nil {
                        return fmt.Errorf("unable to fetch node: %w", err)
                }

                if !dbNode.Alias.Valid {
                        return ErrNodeAliasNotFound
                }

                alias = dbNode.Alias.String

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return "", fmt.Errorf("unable to look up alias: %w", err)
        }

        return alias, nil
}

// SourceNode returns the source node of the graph. The source node is treated
// as the center node within a star-graph. This method may be used to kick off
// a path finding algorithm in order to explore the reachability of another
// node based off the source node.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) SourceNode(ctx context.Context) (*models.LightningNode,
        error) {

        var node *models.LightningNode
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                _, nodePub, err := s.getSourceNode(ctx, db, ProtocolV1)
                if err != nil {
                        return fmt.Errorf("unable to fetch V1 source node: %w",
                                err)
                }

                _, node, err = getNodeByPubKey(ctx, db, nodePub)

                return err
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch source node: %w", err)
        }

        return node, nil
}

// SetSourceNode sets the source node within the graph database. The source
// node is to be used as the center of a star-graph within path finding
// algorithms.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) SetSourceNode(ctx context.Context,
        node *models.LightningNode) error {

        return s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                id, err := upsertNode(ctx, db, node)
                if err != nil {
                        return fmt.Errorf("unable to upsert source node: %w",
                                err)
                }

                // Make sure that if a source node for this version is already
                // set, then the ID is the same as the one we are about to set.
                dbSourceNodeID, _, err := s.getSourceNode(ctx, db, ProtocolV1)
                if err != nil && !errors.Is(err, ErrSourceNodeNotSet) {
                        return fmt.Errorf("unable to fetch source node: %w",
                                err)
                } else if err == nil {
                        if dbSourceNodeID != id {
                                return fmt.Errorf("v1 source node already "+
                                        "set to a different node: %d vs %d",
                                        dbSourceNodeID, id)
                        }

                        return nil
                }

                return db.AddSourceNode(ctx, id)
        }, sqldb.NoOpReset)
}

// NodeUpdatesInHorizon returns all the known lightning node which have an
// update timestamp within the passed range. This method can be used by two
// nodes to quickly determine if they have the same set of up to date node
// announcements.
//
// NOTE: This is part of the V1Store interface.
func (s *SQLStore) NodeUpdatesInHorizon(startTime,
        endTime time.Time) ([]models.LightningNode, error) {

        ctx := context.TODO()

        var nodes []models.LightningNode
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbNodes, err := db.GetNodesByLastUpdateRange(
                        ctx, sqlc.GetNodesByLastUpdateRangeParams{
                                StartTime: sqldb.SQLInt64(startTime.Unix()),
                                EndTime:   sqldb.SQLInt64(endTime.Unix()),
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to fetch nodes: %w", err)
                }

                for _, dbNode := range dbNodes {
                        node, err := buildNode(ctx, db, &dbNode)
                        if err != nil {
                                return fmt.Errorf("unable to build node: %w",
                                        err)
                        }

                        nodes = append(nodes, *node)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch nodes: %w", err)
        }

        return nodes, nil
}

// AddChannelEdge adds a new (undirected, blank) edge to the graph database. An
// undirected edge from the two target nodes are created. The information stored
// denotes the static attributes of the channel, such as the channelID, the keys
// involved in creation of the channel, and the set of features that the channel
// supports. The chanPoint and chanID are used to uniquely identify the edge
// globally within the database.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) AddChannelEdge(ctx context.Context,
        edge *models.ChannelEdgeInfo, opts ...batch.SchedulerOption) error {

        var alreadyExists bool
        r := &batch.Request[SQLQueries]{
                Opts: batch.NewSchedulerOptions(opts...),
                Reset: func() {
                        alreadyExists = false
                },
                Do: func(tx SQLQueries) error {
                        err := insertChannel(ctx, tx, edge)

                        // Silence ErrEdgeAlreadyExist so that the batch can
                        // succeed, but propagate the error via local state.
                        if errors.Is(err, ErrEdgeAlreadyExist) {
                                alreadyExists = true
                                return nil
                        }

                        return err
                },
                OnCommit: func(err error) error {
                        switch {
                        case err != nil:
                                return err
                        case alreadyExists:
                                return ErrEdgeAlreadyExist
                        default:
                                s.rejectCache.remove(edge.ChannelID)
                                s.chanCache.remove(edge.ChannelID)
                                return nil
                        }
                },
        }

        return s.chanScheduler.Execute(ctx, r)
}

// HighestChanID returns the "highest" known channel ID in the channel graph.
// This represents the "newest" channel from the PoV of the chain. This method
// can be used by peers to quickly determine if their graphs are in sync.
//
// NOTE: This is part of the V1Store interface.
func (s *SQLStore) HighestChanID(ctx context.Context) (uint64, error) {
        var highestChanID uint64
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                chanID, err := db.HighestSCID(ctx, int16(ProtocolV1))
                if errors.Is(err, sql.ErrNoRows) {
                        return nil
                } else if err != nil {
                        return fmt.Errorf("unable to fetch highest chan ID: %w",
                                err)
                }

                highestChanID = byteOrder.Uint64(chanID)

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return 0, fmt.Errorf("unable to fetch highest chan ID: %w", err)
        }

        return highestChanID, nil
}

// UpdateEdgePolicy updates the edge routing policy for a single directed edge
// within the database for the referenced channel. The `flags` attribute within
// the ChannelEdgePolicy determines which of the directed edges are being
// updated. If the flag is 1, then the first node's information is being
// updated, otherwise it's the second node's information. The node ordering is
// determined by the lexicographical ordering of the identity public keys of the
// nodes on either side of the channel.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) UpdateEdgePolicy(ctx context.Context,
        edge *models.ChannelEdgePolicy,
        opts ...batch.SchedulerOption) (route.Vertex, route.Vertex, error) {

        var (
                isUpdate1    bool
                edgeNotFound bool
                from, to     route.Vertex
        )

        r := &batch.Request[SQLQueries]{
                Opts: batch.NewSchedulerOptions(opts...),
                Reset: func() {
                        isUpdate1 = false
                        edgeNotFound = false
                },
                Do: func(tx SQLQueries) error {
                        var err error
                        from, to, isUpdate1, err = updateChanEdgePolicy(
                                ctx, tx, edge,
                        )
                        if err != nil {
                                log.Errorf("UpdateEdgePolicy faild: %v", err)
                        }

                        // Silence ErrEdgeNotFound so that the batch can
                        // succeed, but propagate the error via local state.
                        if errors.Is(err, ErrEdgeNotFound) {
                                edgeNotFound = true
                                return nil
                        }

                        return err
                },
                OnCommit: func(err error) error {
                        switch {
                        case err != nil:
                                return err
                        case edgeNotFound:
                                return ErrEdgeNotFound
                        default:
                                s.updateEdgeCache(edge, isUpdate1)
                                return nil
                        }
                },
        }

        err := s.chanScheduler.Execute(ctx, r)

        return from, to, err
}

// updateEdgeCache updates our reject and channel caches with the new
// edge policy information.
func (s *SQLStore) updateEdgeCache(e *models.ChannelEdgePolicy,
        isUpdate1 bool) {

        // If an entry for this channel is found in reject cache, we'll modify
        // the entry with the updated timestamp for the direction that was just
        // written. If the edge doesn't exist, we'll load the cache entry lazily
        // during the next query for this edge.
        if entry, ok := s.rejectCache.get(e.ChannelID); ok {
                if isUpdate1 {
                        entry.upd1Time = e.LastUpdate.Unix()
                } else {
                        entry.upd2Time = e.LastUpdate.Unix()
                }
                s.rejectCache.insert(e.ChannelID, entry)
        }

        // If an entry for this channel is found in channel cache, we'll modify
        // the entry with the updated policy for the direction that was just
        // written. If the edge doesn't exist, we'll defer loading the info and
        // policies and lazily read from disk during the next query.
        if channel, ok := s.chanCache.get(e.ChannelID); ok {
                if isUpdate1 {
                        channel.Policy1 = e
                } else {
                        channel.Policy2 = e
                }
                s.chanCache.insert(e.ChannelID, channel)
        }
}

// ForEachSourceNodeChannel iterates through all channels of the source node,
// executing the passed callback on each. The call-back is provided with the
// channel's outpoint, whether we have a policy for the channel and the channel
// peer's node information.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ForEachSourceNodeChannel(cb func(chanPoint wire.OutPoint,
        havePolicy bool, otherNode *models.LightningNode) error) error {

        var ctx = context.TODO()

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                nodeID, nodePub, err := s.getSourceNode(ctx, db, ProtocolV1)
                if err != nil {
                        return fmt.Errorf("unable to fetch source node: %w",
                                err)
                }

                return forEachNodeChannel(
                        ctx, db, s.cfg.ChainHash, nodeID,
                        func(info *models.ChannelEdgeInfo,
                                outPolicy *models.ChannelEdgePolicy,
                                _ *models.ChannelEdgePolicy) error {

                                // Fetch the other node.
                                var (
                                        otherNodePub [33]byte
                                        node1        = info.NodeKey1Bytes
                                        node2        = info.NodeKey2Bytes
                                )
                                switch {
                                case bytes.Equal(node1[:], nodePub[:]):
                                        otherNodePub = node2
                                case bytes.Equal(node2[:], nodePub[:]):
                                        otherNodePub = node1
                                default:
                                        return fmt.Errorf("node not " +
                                                "participating in this channel")
                                }

                                _, otherNode, err := getNodeByPubKey(
                                        ctx, db, otherNodePub,
                                )
                                if err != nil {
                                        return fmt.Errorf("unable to fetch "+
                                                "other node(%x): %w",
                                                otherNodePub, err)
                                }

                                return cb(
                                        info.ChannelPoint, outPolicy != nil,
                                        otherNode,
                                )
                        },
                )
        }, sqldb.NoOpReset)
}

// ForEachNode iterates through all the stored vertices/nodes in the graph,
// executing the passed callback with each node encountered. If the callback
// returns an error, then the transaction is aborted and the iteration stops
// early. Any operations performed on the NodeTx passed to the call-back are
// executed under the same read transaction and so, methods on the NodeTx object
// _MUST_ only be called from within the call-back.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ForEachNode(cb func(tx NodeRTx) error) error {
        var (
                ctx          = context.TODO()
                lastID int64 = 0
        )

        handleNode := func(db SQLQueries, dbNode sqlc.Node) error {
                node, err := buildNode(ctx, db, &dbNode)
                if err != nil {
                        return fmt.Errorf("unable to build node(id=%d): %w",
                                dbNode.ID, err)
                }

                err = cb(
                        newSQLGraphNodeTx(db, s.cfg.ChainHash, dbNode.ID, node),
                )
                if err != nil {
                        return fmt.Errorf("callback failed for node(id=%d): %w",
                                dbNode.ID, err)
                }

                return nil
        }

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                for {
                        nodes, err := db.ListNodesPaginated(
                                ctx, sqlc.ListNodesPaginatedParams{
                                        Version: int16(ProtocolV1),
                                        ID:      lastID,
                                        Limit:   pageSize,
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to fetch nodes: %w",
                                        err)
                        }

                        if len(nodes) == 0 {
                                break
                        }

                        for _, dbNode := range nodes {
                                err = handleNode(db, dbNode)
                                if err != nil {
                                        return err
                                }

                                lastID = dbNode.ID
                        }
                }

                return nil
        }, sqldb.NoOpReset)
}

// sqlGraphNodeTx is an implementation of the NodeRTx interface backed by the
// SQLStore and a SQL transaction.
type sqlGraphNodeTx struct {
        db    SQLQueries
        id    int64
        node  *models.LightningNode
        chain chainhash.Hash
}

// A compile-time constraint to ensure sqlGraphNodeTx implements the NodeRTx
// interface.
var _ NodeRTx = (*sqlGraphNodeTx)(nil)

func newSQLGraphNodeTx(db SQLQueries, chain chainhash.Hash,
        id int64, node *models.LightningNode) *sqlGraphNodeTx {

        return &sqlGraphNodeTx{
                db:    db,
                chain: chain,
                id:    id,
                node:  node,
        }
}

// Node returns the raw information of the node.
//
// NOTE: This is a part of the NodeRTx interface.
func (s *sqlGraphNodeTx) Node() *models.LightningNode {
        return s.node
}

// ForEachChannel can be used to iterate over the node's channels under the same
// transaction used to fetch the node.
//
// NOTE: This is a part of the NodeRTx interface.
func (s *sqlGraphNodeTx) ForEachChannel(cb func(*models.ChannelEdgeInfo,
        *models.ChannelEdgePolicy, *models.ChannelEdgePolicy) error) error {

        ctx := context.TODO()

        return forEachNodeChannel(ctx, s.db, s.chain, s.id, cb)
}

// FetchNode fetches the node with the given pub key under the same transaction
// used to fetch the current node. The returned node is also a NodeRTx and any
// operations on that NodeRTx will also be done under the same transaction.
//
// NOTE: This is a part of the NodeRTx interface.
func (s *sqlGraphNodeTx) FetchNode(nodePub route.Vertex) (NodeRTx, error) {
        ctx := context.TODO()

        id, node, err := getNodeByPubKey(ctx, s.db, nodePub)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch V1 node(%x): %w",
                        nodePub, err)
        }

        return newSQLGraphNodeTx(s.db, s.chain, id, node), nil
}

// ForEachNodeDirectedChannel iterates through all channels of a given node,
// executing the passed callback on the directed edge representing the channel
// and its incoming policy. If the callback returns an error, then the iteration
// is halted with the error propagated back up to the caller.
//
// Unknown policies are passed into the callback as nil values.
//
// NOTE: this is part of the graphdb.NodeTraverser interface.
func (s *SQLStore) ForEachNodeDirectedChannel(nodePub route.Vertex,
        cb func(channel *DirectedChannel) error) error {

        var ctx = context.TODO()

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                return forEachNodeDirectedChannel(ctx, db, nodePub, cb)
        }, sqldb.NoOpReset)
}

// ForEachNodeCacheable iterates through all the stored vertices/nodes in the
// graph, executing the passed callback with each node encountered. If the
// callback returns an error, then the transaction is aborted and the iteration
// stops early.
//
// NOTE: This is a part of the V1Store interface.
func (s *SQLStore) ForEachNodeCacheable(cb func(route.Vertex,
        *lnwire.FeatureVector) error) error {

        ctx := context.TODO()

        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                return forEachNodeCacheable(ctx, db, func(nodeID int64,
                        nodePub route.Vertex) error {

                        features, err := getNodeFeatures(ctx, db, nodeID)
                        if err != nil {
                                return fmt.Errorf("unable to fetch node "+
                                        "features: %w", err)
                        }

                        return cb(nodePub, features)
                })
        }, sqldb.NoOpReset)
        if err != nil {
                return fmt.Errorf("unable to fetch nodes: %w", err)
        }

        return nil
}

// ForEachNodeChannel iterates through all channels of the given node,
// executing the passed callback with an edge info structure and the policies
// of each end of the channel. The first edge policy is the outgoing edge *to*
// the connecting node, while the second is the incoming edge *from* the
// connecting node. If the callback returns an error, then the iteration is
// halted with the error propagated back up to the caller.
//
// Unknown policies are passed into the callback as nil values.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ForEachNodeChannel(nodePub route.Vertex,
        cb func(*models.ChannelEdgeInfo, *models.ChannelEdgePolicy,
                *models.ChannelEdgePolicy) error) error {

        var ctx = context.TODO()

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbNode, err := db.GetNodeByPubKey(
                        ctx, sqlc.GetNodeByPubKeyParams{
                                Version: int16(ProtocolV1),
                                PubKey:  nodePub[:],
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return nil
                } else if err != nil {
                        return fmt.Errorf("unable to fetch node: %w", err)
                }

                return forEachNodeChannel(
                        ctx, db, s.cfg.ChainHash, dbNode.ID, cb,
                )
        }, sqldb.NoOpReset)
}

// ChanUpdatesInHorizon returns all the known channel edges which have at least
// one edge that has an update timestamp within the specified horizon.
//
// NOTE: This is part of the V1Store interface.
func (s *SQLStore) ChanUpdatesInHorizon(startTime,
        endTime time.Time) ([]ChannelEdge, error) {

        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        var (
                ctx = context.TODO()
                // To ensure we don't return duplicate ChannelEdges, we'll use
                // an additional map to keep track of the edges already seen to
                // prevent re-adding it.
                edgesSeen    = make(map[uint64]struct{})
                edgesToCache = make(map[uint64]ChannelEdge)
                edges        []ChannelEdge
                hits         int
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                rows, err := db.GetChannelsByPolicyLastUpdateRange(
                        ctx, sqlc.GetChannelsByPolicyLastUpdateRangeParams{
                                Version:   int16(ProtocolV1),
                                StartTime: sqldb.SQLInt64(startTime.Unix()),
                                EndTime:   sqldb.SQLInt64(endTime.Unix()),
                        },
                )
                if err != nil {
                        return err
                }

                for _, row := range rows {
                        // If we've already retrieved the info and policies for
                        // this edge, then we can skip it as we don't need to do
                        // so again.
                        chanIDInt := byteOrder.Uint64(row.Channel.Scid)
                        if _, ok := edgesSeen[chanIDInt]; ok {
                                continue
                        }

                        if channel, ok := s.chanCache.get(chanIDInt); ok {
                                hits++
                                edgesSeen[chanIDInt] = struct{}{}
                                edges = append(edges, channel)

                                continue
                        }

                        node1, node2, err := buildNodes(
                                ctx, db, row.Node, row.Node_2,
                        )
                        if err != nil {
                                return err
                        }

                        channel, err := getAndBuildEdgeInfo(
                                ctx, db, s.cfg.ChainHash, row.Channel.ID,
                                row.Channel, node1.PubKeyBytes,
                                node2.PubKeyBytes,
                        )
                        if err != nil {
                                return fmt.Errorf("unable to build channel "+
                                        "info: %w", err)
                        }

                        dbPol1, dbPol2, err := extractChannelPolicies(row)
                        if err != nil {
                                return fmt.Errorf("unable to extract channel "+
                                        "policies: %w", err)
                        }

                        p1, p2, err := getAndBuildChanPolicies(
                                ctx, db, dbPol1, dbPol2, channel.ChannelID,
                                node1.PubKeyBytes, node2.PubKeyBytes,
                        )
                        if err != nil {
                                return fmt.Errorf("unable to build channel "+
                                        "policies: %w", err)
                        }

                        edgesSeen[chanIDInt] = struct{}{}
                        chanEdge := ChannelEdge{
                                Info:    channel,
                                Policy1: p1,
                                Policy2: p2,
                                Node1:   node1,
                                Node2:   node2,
                        }
                        edges = append(edges, chanEdge)
                        edgesToCache[chanIDInt] = chanEdge
                }

                return nil
        }, func() {
                edgesSeen = make(map[uint64]struct{})
                edgesToCache = make(map[uint64]ChannelEdge)
                edges = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to fetch channels: %w", err)
        }

        // Insert any edges loaded from disk into the cache.
        for chanid, channel := range edgesToCache {
                s.chanCache.insert(chanid, channel)
        }

        if len(edges) > 0 {
                log.Debugf("ChanUpdatesInHorizon hit percentage: %f (%d/%d)",
                        float64(hits)/float64(len(edges)), hits, len(edges))
        } else {
                log.Debugf("ChanUpdatesInHorizon returned no edges in "+
                        "horizon (%s, %s)", startTime, endTime)
        }

        return edges, nil
}

// ForEachNodeCached is similar to forEachNode, but it returns DirectedChannel
// data to the call-back.
//
// NOTE: The callback contents MUST not be modified.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ForEachNodeCached(cb func(node route.Vertex,
        chans map[uint64]*DirectedChannel) error) error {

        var ctx = context.TODO()

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                return forEachNodeCacheable(ctx, db, func(nodeID int64,
                        nodePub route.Vertex) error {

                        features, err := getNodeFeatures(ctx, db, nodeID)
                        if err != nil {
                                return fmt.Errorf("unable to fetch "+
                                        "node(id=%d) features: %w", nodeID, err)
                        }

                        toNodeCallback := func() route.Vertex {
                                return nodePub
                        }

                        rows, err := db.ListChannelsByNodeID(
                                ctx, sqlc.ListChannelsByNodeIDParams{
                                        Version: int16(ProtocolV1),
                                        NodeID1: nodeID,
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to fetch channels "+
                                        "of node(id=%d): %w", nodeID, err)
                        }

                        channels := make(map[uint64]*DirectedChannel, len(rows))
                        for _, row := range rows {
                                node1, node2, err := buildNodeVertices(
                                        row.Node1Pubkey, row.Node2Pubkey,
                                )
                                if err != nil {
                                        return err
                                }

                                e, err := getAndBuildEdgeInfo(
                                        ctx, db, s.cfg.ChainHash,
                                        row.Channel.ID, row.Channel, node1,
                                        node2,
                                )
                                if err != nil {
                                        return fmt.Errorf("unable to build "+
                                                "channel info: %w", err)
                                }

                                dbPol1, dbPol2, err := extractChannelPolicies(
                                        row,
                                )
                                if err != nil {
                                        return fmt.Errorf("unable to "+
                                                "extract channel "+
                                                "policies: %w", err)
                                }

                                p1, p2, err := getAndBuildChanPolicies(
                                        ctx, db, dbPol1, dbPol2, e.ChannelID,
                                        node1, node2,
                                )
                                if err != nil {
                                        return fmt.Errorf("unable to "+
                                                "build channel policies: %w",
                                                err)
                                }

                                // Determine the outgoing and incoming policy
                                // for this channel and node combo.
                                outPolicy, inPolicy := p1, p2
                                if p1 != nil && p1.ToNode == nodePub {
                                        outPolicy, inPolicy = p2, p1
                                } else if p2 != nil && p2.ToNode != nodePub {
                                        outPolicy, inPolicy = p2, p1
                                }

                                var cachedInPolicy *models.CachedEdgePolicy
                                if inPolicy != nil {
                                        cachedInPolicy = models.NewCachedPolicy(
                                                p2,
                                        )
                                        cachedInPolicy.ToNodePubKey =
                                                toNodeCallback
                                        cachedInPolicy.ToNodeFeatures =
                                                features
                                }

                                var inboundFee lnwire.Fee
                                outPolicy.InboundFee.WhenSome(
                                        func(fee lnwire.Fee) {
                                                inboundFee = fee
                                        },
                                )

                                directedChannel := &DirectedChannel{
                                        ChannelID: e.ChannelID,
                                        IsNode1: nodePub ==
                                                e.NodeKey1Bytes,
                                        OtherNode:    e.NodeKey2Bytes,
                                        Capacity:     e.Capacity,
                                        OutPolicySet: p1 != nil,
                                        InPolicy:     cachedInPolicy,
                                        InboundFee:   inboundFee,
                                }

                                if nodePub == e.NodeKey2Bytes {
                                        directedChannel.OtherNode =
                                                e.NodeKey1Bytes
                                }

                                channels[e.ChannelID] = directedChannel
                        }

                        return cb(nodePub, channels)
                })
        }, sqldb.NoOpReset)
}

// ForEachChannel iterates through all the channel edges stored within the
// graph and invokes the passed callback for each edge. The callback takes two
// edges as since this is a directed graph, both the in/out edges are visited.
// If the callback returns an error, then the transaction is aborted and the
// iteration stops early.
//
// NOTE: If an edge can't be found, or wasn't advertised, then a nil pointer
// for that particular channel edge routing policy will be passed into the
// callback.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ForEachChannel(cb func(*models.ChannelEdgeInfo,
        *models.ChannelEdgePolicy, *models.ChannelEdgePolicy) error) error {

        ctx := context.TODO()

        handleChannel := func(db SQLQueries,
                row sqlc.ListChannelsWithPoliciesPaginatedRow) error {

                node1, node2, err := buildNodeVertices(
                        row.Node1Pubkey, row.Node2Pubkey,
                )
                if err != nil {
                        return fmt.Errorf("unable to build node vertices: %w",
                                err)
                }

                edge, err := getAndBuildEdgeInfo(
                        ctx, db, s.cfg.ChainHash, row.Channel.ID, row.Channel,
                        node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel info: %w",
                                err)
                }

                dbPol1, dbPol2, err := extractChannelPolicies(row)
                if err != nil {
                        return fmt.Errorf("unable to extract channel "+
                                "policies: %w", err)
                }

                p1, p2, err := getAndBuildChanPolicies(
                        ctx, db, dbPol1, dbPol2, edge.ChannelID, node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel "+
                                "policies: %w", err)
                }

                err = cb(edge, p1, p2)
                if err != nil {
                        return fmt.Errorf("callback failed for channel "+
                                "id=%d: %w", edge.ChannelID, err)
                }

                return nil
        }

        return s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var lastID int64
                for {
                        //nolint:ll
                        rows, err := db.ListChannelsWithPoliciesPaginated(
                                ctx, sqlc.ListChannelsWithPoliciesPaginatedParams{
                                        Version: int16(ProtocolV1),
                                        ID:      lastID,
                                        Limit:   pageSize,
                                },
                        )
                        if err != nil {
                                return err
                        }

                        if len(rows) == 0 {
                                break
                        }

                        for _, row := range rows {
                                err := handleChannel(db, row)
                                if err != nil {
                                        return err
                                }

                                lastID = row.Channel.ID
                        }
                }

                return nil
        }, sqldb.NoOpReset)
}

// FilterChannelRange returns the channel ID's of all known channels which were
// mined in a block height within the passed range. The channel IDs are grouped
// by their common block height. This method can be used to quickly share with a
// peer the set of channels we know of within a particular range to catch them
// up after a period of time offline. If withTimestamps is true then the
// timestamp info of the latest received channel update messages of the channel
// will be included in the response.
//
// NOTE: This is part of the V1Store interface.
func (s *SQLStore) FilterChannelRange(startHeight, endHeight uint32,
        withTimestamps bool) ([]BlockChannelRange, error) {

        var (
                ctx       = context.TODO()
                startSCID = &lnwire.ShortChannelID{
                        BlockHeight: startHeight,
                }
                endSCID = lnwire.ShortChannelID{
                        BlockHeight: endHeight,
                        TxIndex:     math.MaxUint32 & 0x00ffffff,
                        TxPosition:  math.MaxUint16,
                }
                chanIDStart = channelIDToBytes(startSCID.ToUint64())
                chanIDEnd   = channelIDToBytes(endSCID.ToUint64())
        )

        // 1) get all channels where channelID is between start and end chan ID.
        // 2) skip if not public (ie, no channel_proof)
        // 3) collect that channel.
        // 4) if timestamps are wanted, fetch both policies for node 1 and node2
        //    and add those timestamps to the collected channel.
        channelsPerBlock := make(map[uint32][]ChannelUpdateInfo)
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                dbChans, err := db.GetPublicV1ChannelsBySCID(
                        ctx, sqlc.GetPublicV1ChannelsBySCIDParams{
                                StartScid: chanIDStart[:],
                                EndScid:   chanIDEnd[:],
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to fetch channel range: %w",
                                err)
                }

                for _, dbChan := range dbChans {
                        cid := lnwire.NewShortChanIDFromInt(
                                byteOrder.Uint64(dbChan.Scid),
                        )
                        chanInfo := NewChannelUpdateInfo(
                                cid, time.Time{}, time.Time{},
                        )

                        if !withTimestamps {
                                channelsPerBlock[cid.BlockHeight] = append(
                                        channelsPerBlock[cid.BlockHeight],
                                        chanInfo,
                                )

                                continue
                        }

                        //nolint:ll
                        node1Policy, err := db.GetChannelPolicyByChannelAndNode(
                                ctx, sqlc.GetChannelPolicyByChannelAndNodeParams{
                                        Version:   int16(ProtocolV1),
                                        ChannelID: dbChan.ID,
                                        NodeID:    dbChan.NodeID1,
                                },
                        )
                        if err != nil && !errors.Is(err, sql.ErrNoRows) {
                                return fmt.Errorf("unable to fetch node1 "+
                                        "policy: %w", err)
                        } else if err == nil {
                                chanInfo.Node1UpdateTimestamp = time.Unix(
                                        node1Policy.LastUpdate.Int64, 0,
                                )
                        }

                        //nolint:ll
                        node2Policy, err := db.GetChannelPolicyByChannelAndNode(
                                ctx, sqlc.GetChannelPolicyByChannelAndNodeParams{
                                        Version:   int16(ProtocolV1),
                                        ChannelID: dbChan.ID,
                                        NodeID:    dbChan.NodeID2,
                                },
                        )
                        if err != nil && !errors.Is(err, sql.ErrNoRows) {
                                return fmt.Errorf("unable to fetch node2 "+
                                        "policy: %w", err)
                        } else if err == nil {
                                chanInfo.Node2UpdateTimestamp = time.Unix(
                                        node2Policy.LastUpdate.Int64, 0,
                                )
                        }

                        channelsPerBlock[cid.BlockHeight] = append(
                                channelsPerBlock[cid.BlockHeight], chanInfo,
                        )
                }

                return nil
        }, func() {
                channelsPerBlock = make(map[uint32][]ChannelUpdateInfo)
        })
        if err != nil {
                return nil, fmt.Errorf("unable to fetch channel range: %w", err)
        }

        if len(channelsPerBlock) == 0 {
                return nil, nil
        }

        // Return the channel ranges in ascending block height order.
        blocks := slices.Collect(maps.Keys(channelsPerBlock))
        slices.Sort(blocks)

        return fn.Map(blocks, func(block uint32) BlockChannelRange {
                return BlockChannelRange{
                        Height:   block,
                        Channels: channelsPerBlock[block],
                }
        }), nil
}

// MarkEdgeZombie attempts to mark a channel identified by its channel ID as a
// zombie. This method is used on an ad-hoc basis, when channels need to be
// marked as zombies outside the normal pruning cycle.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) MarkEdgeZombie(chanID uint64,
        pubKey1, pubKey2 [33]byte) error {

        ctx := context.TODO()

        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        chanIDB := channelIDToBytes(chanID)

        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                return db.UpsertZombieChannel(
                        ctx, sqlc.UpsertZombieChannelParams{
                                Version:  int16(ProtocolV1),
                                Scid:     chanIDB[:],
                                NodeKey1: pubKey1[:],
                                NodeKey2: pubKey2[:],
                        },
                )
        }, sqldb.NoOpReset)
        if err != nil {
                return fmt.Errorf("unable to upsert zombie channel "+
                        "(channel_id=%d): %w", chanID, err)
        }

        s.rejectCache.remove(chanID)
        s.chanCache.remove(chanID)

        return nil
}

// MarkEdgeLive clears an edge from our zombie index, deeming it as live.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) MarkEdgeLive(chanID uint64) error {
        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        var (
                ctx     = context.TODO()
                chanIDB = channelIDToBytes(chanID)
        )

        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                res, err := db.DeleteZombieChannel(
                        ctx, sqlc.DeleteZombieChannelParams{
                                Scid:    chanIDB[:],
                                Version: int16(ProtocolV1),
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to delete zombie channel: %w",
                                err)
                }

                rows, err := res.RowsAffected()
                if err != nil {
                        return err
                }

                if rows == 0 {
                        return ErrZombieEdgeNotFound
                } else if rows > 1 {
                        return fmt.Errorf("deleted %d zombie rows, "+
                                "expected 1", rows)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return fmt.Errorf("unable to mark edge live "+
                        "(channel_id=%d): %w", chanID, err)
        }

        s.rejectCache.remove(chanID)
        s.chanCache.remove(chanID)

        return err
}

// IsZombieEdge returns whether the edge is considered zombie. If it is a
// zombie, then the two node public keys corresponding to this edge are also
// returned.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) IsZombieEdge(chanID uint64) (bool, [33]byte, [33]byte) {
        var (
                ctx              = context.TODO()
                isZombie         bool
                pubKey1, pubKey2 route.Vertex
                chanIDB          = channelIDToBytes(chanID)
        )

        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                zombie, err := db.GetZombieChannel(
                        ctx, sqlc.GetZombieChannelParams{
                                Scid:    chanIDB[:],
                                Version: int16(ProtocolV1),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return nil
                }
                if err != nil {
                        return fmt.Errorf("unable to fetch zombie channel: %w",
                                err)
                }

                copy(pubKey1[:], zombie.NodeKey1)
                copy(pubKey2[:], zombie.NodeKey2)
                isZombie = true

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                // TODO(elle): update the IsZombieEdge method to return an
                // error.
                return false, route.Vertex{}, route.Vertex{}
        }

        return isZombie, pubKey1, pubKey2
}

// NumZombies returns the current number of zombie channels in the graph.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) NumZombies() (uint64, error) {
        var (
                ctx        = context.TODO()
                numZombies uint64
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                count, err := db.CountZombieChannels(ctx, int16(ProtocolV1))
                if err != nil {
                        return fmt.Errorf("unable to count zombie channels: %w",
                                err)
                }

                numZombies = uint64(count)

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return 0, fmt.Errorf("unable to count zombies: %w", err)
        }

        return numZombies, nil
}

// DeleteChannelEdges removes edges with the given channel IDs from the
// database and marks them as zombies. This ensures that we're unable to re-add
// it to our database once again. If an edge does not exist within the
// database, then ErrEdgeNotFound will be returned. If strictZombiePruning is
// true, then when we mark these edges as zombies, we'll set up the keys such
// that we require the node that failed to send the fresh update to be the one
// that resurrects the channel from its zombie state. The markZombie bool
// denotes whether to mark the channel as a zombie.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) DeleteChannelEdges(strictZombiePruning, markZombie bool,
        chanIDs ...uint64) ([]*models.ChannelEdgeInfo, error) {

        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        var (
                ctx     = context.TODO()
                deleted []*models.ChannelEdgeInfo
        )
        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                for _, chanID := range chanIDs {
                        chanIDB := channelIDToBytes(chanID)

                        row, err := db.GetChannelBySCIDWithPolicies(
                                ctx, sqlc.GetChannelBySCIDWithPoliciesParams{
                                        Scid:    chanIDB[:],
                                        Version: int16(ProtocolV1),
                                },
                        )
                        if errors.Is(err, sql.ErrNoRows) {
                                return ErrEdgeNotFound
                        } else if err != nil {
                                return fmt.Errorf("unable to fetch channel: %w",
                                        err)
                        }

                        node1, node2, err := buildNodeVertices(
                                row.Node.PubKey, row.Node_2.PubKey,
                        )
                        if err != nil {
                                return err
                        }

                        info, err := getAndBuildEdgeInfo(
                                ctx, db, s.cfg.ChainHash, row.Channel.ID,
                                row.Channel, node1, node2,
                        )
                        if err != nil {
                                return err
                        }

                        err = db.DeleteChannel(ctx, row.Channel.ID)
                        if err != nil {
                                return fmt.Errorf("unable to delete "+
                                        "channel: %w", err)
                        }

                        deleted = append(deleted, info)

                        if !markZombie {
                                continue
                        }

                        nodeKey1, nodeKey2 := info.NodeKey1Bytes,
                                info.NodeKey2Bytes
                        if strictZombiePruning {
                                var e1UpdateTime, e2UpdateTime *time.Time
                                if row.Policy1LastUpdate.Valid {
                                        e1Time := time.Unix(
                                                row.Policy1LastUpdate.Int64, 0,
                                        )
                                        e1UpdateTime = &e1Time
                                }
                                if row.Policy2LastUpdate.Valid {
                                        e2Time := time.Unix(
                                                row.Policy2LastUpdate.Int64, 0,
                                        )
                                        e2UpdateTime = &e2Time
                                }

                                nodeKey1, nodeKey2 = makeZombiePubkeys(
                                        info, e1UpdateTime, e2UpdateTime,
                                )
                        }

                        err = db.UpsertZombieChannel(
                                ctx, sqlc.UpsertZombieChannelParams{
                                        Version:  int16(ProtocolV1),
                                        Scid:     chanIDB[:],
                                        NodeKey1: nodeKey1[:],
                                        NodeKey2: nodeKey2[:],
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to mark channel as "+
                                        "zombie: %w", err)
                        }
                }

                return nil
        }, func() {
                deleted = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to delete channel edges: %w",
                        err)
        }

        for _, chanID := range chanIDs {
                s.rejectCache.remove(chanID)
                s.chanCache.remove(chanID)
        }

        return deleted, nil
}

// FetchChannelEdgesByID attempts to lookup the two directed edges for the
// channel identified by the channel ID. If the channel can't be found, then
// ErrEdgeNotFound is returned. A struct which houses the general information
// for the channel itself is returned as well as two structs that contain the
// routing policies for the channel in either direction.
//
// ErrZombieEdge an be returned if the edge is currently marked as a zombie
// within the database. In this case, the ChannelEdgePolicy's will be nil, and
// the ChannelEdgeInfo will only include the public keys of each node.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) FetchChannelEdgesByID(chanID uint64) (
        *models.ChannelEdgeInfo, *models.ChannelEdgePolicy,
        *models.ChannelEdgePolicy, error) {

        var (
                ctx              = context.TODO()
                edge             *models.ChannelEdgeInfo
                policy1, policy2 *models.ChannelEdgePolicy
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var chanIDB [8]byte
                byteOrder.PutUint64(chanIDB[:], chanID)

                row, err := db.GetChannelBySCIDWithPolicies(
                        ctx, sqlc.GetChannelBySCIDWithPoliciesParams{
                                Scid:    chanIDB[:],
                                Version: int16(ProtocolV1),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        // First check if this edge is perhaps in the zombie
                        // index.
                        isZombie, err := db.IsZombieChannel(
                                ctx, sqlc.IsZombieChannelParams{
                                        Scid:    chanIDB[:],
                                        Version: int16(ProtocolV1),
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to check if "+
                                        "channel is zombie: %w", err)
                        } else if isZombie {
                                return ErrZombieEdge
                        }

                        return ErrEdgeNotFound
                } else if err != nil {
                        return fmt.Errorf("unable to fetch channel: %w", err)
                }

                node1, node2, err := buildNodeVertices(
                        row.Node.PubKey, row.Node_2.PubKey,
                )
                if err != nil {
                        return err
                }

                edge, err = getAndBuildEdgeInfo(
                        ctx, db, s.cfg.ChainHash, row.Channel.ID, row.Channel,
                        node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel info: %w",
                                err)
                }

                dbPol1, dbPol2, err := extractChannelPolicies(row)
                if err != nil {
                        return fmt.Errorf("unable to extract channel "+
                                "policies: %w", err)
                }

                policy1, policy2, err = getAndBuildChanPolicies(
                        ctx, db, dbPol1, dbPol2, edge.ChannelID, node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel "+
                                "policies: %w", err)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, nil, nil, fmt.Errorf("could not fetch channel: %w",
                        err)
        }

        return edge, policy1, policy2, nil
}

// FetchChannelEdgesByOutpoint attempts to lookup the two directed edges for
// the channel identified by the funding outpoint. If the channel can't be
// found, then ErrEdgeNotFound is returned. A struct which houses the general
// information for the channel itself is returned as well as two structs that
// contain the routing policies for the channel in either direction.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) FetchChannelEdgesByOutpoint(op *wire.OutPoint) (
        *models.ChannelEdgeInfo, *models.ChannelEdgePolicy,
        *models.ChannelEdgePolicy, error) {

        var (
                ctx              = context.TODO()
                edge             *models.ChannelEdgeInfo
                policy1, policy2 *models.ChannelEdgePolicy
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                row, err := db.GetChannelByOutpointWithPolicies(
                        ctx, sqlc.GetChannelByOutpointWithPoliciesParams{
                                Outpoint: op.String(),
                                Version:  int16(ProtocolV1),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return ErrEdgeNotFound
                } else if err != nil {
                        return fmt.Errorf("unable to fetch channel: %w", err)
                }

                node1, node2, err := buildNodeVertices(
                        row.Node1Pubkey, row.Node2Pubkey,
                )
                if err != nil {
                        return err
                }

                edge, err = getAndBuildEdgeInfo(
                        ctx, db, s.cfg.ChainHash, row.Channel.ID, row.Channel,
                        node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel info: %w",
                                err)
                }

                dbPol1, dbPol2, err := extractChannelPolicies(row)
                if err != nil {
                        return fmt.Errorf("unable to extract channel "+
                                "policies: %w", err)
                }

                policy1, policy2, err = getAndBuildChanPolicies(
                        ctx, db, dbPol1, dbPol2, edge.ChannelID, node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel "+
                                "policies: %w", err)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, nil, nil, fmt.Errorf("could not fetch channel: %w",
                        err)
        }

        return edge, policy1, policy2, nil
}

// HasChannelEdge returns true if the database knows of a channel edge with the
// passed channel ID, and false otherwise. If an edge with that ID is found
// within the graph, then two time stamps representing the last time the edge
// was updated for both directed edges are returned along with the boolean. If
// it is not found, then the zombie index is checked and its result is returned
// as the second boolean.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) HasChannelEdge(chanID uint64) (time.Time, time.Time, bool,
        bool, error) {

        ctx := context.TODO()

        var (
                exists          bool
                isZombie        bool
                node1LastUpdate time.Time
                node2LastUpdate time.Time
        )

        // We'll query the cache with the shared lock held to allow multiple
        // readers to access values in the cache concurrently if they exist.
        s.cacheMu.RLock()
        if entry, ok := s.rejectCache.get(chanID); ok {
                s.cacheMu.RUnlock()
                node1LastUpdate = time.Unix(entry.upd1Time, 0)
                node2LastUpdate = time.Unix(entry.upd2Time, 0)
                exists, isZombie = entry.flags.unpack()

                return node1LastUpdate, node2LastUpdate, exists, isZombie, nil
        }
        s.cacheMu.RUnlock()

        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        // The item was not found with the shared lock, so we'll acquire the
        // exclusive lock and check the cache again in case another method added
        // the entry to the cache while no lock was held.
        if entry, ok := s.rejectCache.get(chanID); ok {
                node1LastUpdate = time.Unix(entry.upd1Time, 0)
                node2LastUpdate = time.Unix(entry.upd2Time, 0)
                exists, isZombie = entry.flags.unpack()

                return node1LastUpdate, node2LastUpdate, exists, isZombie, nil
        }

        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var chanIDB [8]byte
                byteOrder.PutUint64(chanIDB[:], chanID)

                channel, err := db.GetChannelBySCID(
                        ctx, sqlc.GetChannelBySCIDParams{
                                Scid:    chanIDB[:],
                                Version: int16(ProtocolV1),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        // Check if it is a zombie channel.
                        isZombie, err = db.IsZombieChannel(
                                ctx, sqlc.IsZombieChannelParams{
                                        Scid:    chanIDB[:],
                                        Version: int16(ProtocolV1),
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("could not check if channel "+
                                        "is zombie: %w", err)
                        }

                        return nil
                } else if err != nil {
                        return fmt.Errorf("unable to fetch channel: %w", err)
                }

                exists = true

                policy1, err := db.GetChannelPolicyByChannelAndNode(
                        ctx, sqlc.GetChannelPolicyByChannelAndNodeParams{
                                Version:   int16(ProtocolV1),
                                ChannelID: channel.ID,
                                NodeID:    channel.NodeID1,
                        },
                )
                if err != nil && !errors.Is(err, sql.ErrNoRows) {
                        return fmt.Errorf("unable to fetch channel policy: %w",
                                err)
                } else if err == nil {
                        node1LastUpdate = time.Unix(policy1.LastUpdate.Int64, 0)
                }

                policy2, err := db.GetChannelPolicyByChannelAndNode(
                        ctx, sqlc.GetChannelPolicyByChannelAndNodeParams{
                                Version:   int16(ProtocolV1),
                                ChannelID: channel.ID,
                                NodeID:    channel.NodeID2,
                        },
                )
                if err != nil && !errors.Is(err, sql.ErrNoRows) {
                        return fmt.Errorf("unable to fetch channel policy: %w",
                                err)
                } else if err == nil {
                        node2LastUpdate = time.Unix(policy2.LastUpdate.Int64, 0)
                }

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return time.Time{}, time.Time{}, false, false,
                        fmt.Errorf("unable to fetch channel: %w", err)
        }

        s.rejectCache.insert(chanID, rejectCacheEntry{
                upd1Time: node1LastUpdate.Unix(),
                upd2Time: node2LastUpdate.Unix(),
                flags:    packRejectFlags(exists, isZombie),
        })

        return node1LastUpdate, node2LastUpdate, exists, isZombie, nil
}

// ChannelID attempt to lookup the 8-byte compact channel ID which maps to the
// passed channel point (outpoint). If the passed channel doesn't exist within
// the database, then ErrEdgeNotFound is returned.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ChannelID(chanPoint *wire.OutPoint) (uint64, error) {
        var (
                ctx       = context.TODO()
                channelID uint64
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                chanID, err := db.GetSCIDByOutpoint(
                        ctx, sqlc.GetSCIDByOutpointParams{
                                Outpoint: chanPoint.String(),
                                Version:  int16(ProtocolV1),
                        },
                )
                if errors.Is(err, sql.ErrNoRows) {
                        return ErrEdgeNotFound
                } else if err != nil {
                        return fmt.Errorf("unable to fetch channel ID: %w",
                                err)
                }

                channelID = byteOrder.Uint64(chanID)

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return 0, fmt.Errorf("unable to fetch channel ID: %w", err)
        }

        return channelID, nil
}

// IsPublicNode is a helper method that determines whether the node with the
// given public key is seen as a public node in the graph from the graph's
// source node's point of view.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) IsPublicNode(pubKey [33]byte) (bool, error) {
        ctx := context.TODO()

        var isPublic bool
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                var err error
                isPublic, err = db.IsPublicV1Node(ctx, pubKey[:])

                return err
        }, sqldb.NoOpReset)
        if err != nil {
                return false, fmt.Errorf("unable to check if node is "+
                        "public: %w", err)
        }

        return isPublic, nil
}

// FetchChanInfos returns the set of channel edges that correspond to the passed
// channel ID's. If an edge is the query is unknown to the database, it will
// skipped and the result will contain only those edges that exist at the time
// of the query. This can be used to respond to peer queries that are seeking to
// fill in gaps in their view of the channel graph.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) FetchChanInfos(chanIDs []uint64) ([]ChannelEdge, error) {
        var (
                ctx   = context.TODO()
                edges []ChannelEdge
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                for _, chanID := range chanIDs {
                        var chanIDB [8]byte
                        byteOrder.PutUint64(chanIDB[:], chanID)

                        // TODO(elle): potentially optimize this by using
                        //  sqlc.slice() once that works for both SQLite and
                        //  Postgres.
                        row, err := db.GetChannelBySCIDWithPolicies(
                                ctx, sqlc.GetChannelBySCIDWithPoliciesParams{
                                        Scid:    chanIDB[:],
                                        Version: int16(ProtocolV1),
                                },
                        )
                        if errors.Is(err, sql.ErrNoRows) {
                                continue
                        } else if err != nil {
                                return fmt.Errorf("unable to fetch channel: %w",
                                        err)
                        }

                        node1, node2, err := buildNodes(
                                ctx, db, row.Node, row.Node_2,
                        )
                        if err != nil {
                                return fmt.Errorf("unable to fetch nodes: %w",
                                        err)
                        }

                        edge, err := getAndBuildEdgeInfo(
                                ctx, db, s.cfg.ChainHash, row.Channel.ID,
                                row.Channel, node1.PubKeyBytes,
                                node2.PubKeyBytes,
                        )
                        if err != nil {
                                return fmt.Errorf("unable to build "+
                                        "channel info: %w", err)
                        }

                        dbPol1, dbPol2, err := extractChannelPolicies(row)
                        if err != nil {
                                return fmt.Errorf("unable to extract channel "+
                                        "policies: %w", err)
                        }

                        p1, p2, err := getAndBuildChanPolicies(
                                ctx, db, dbPol1, dbPol2, edge.ChannelID,
                                node1.PubKeyBytes, node2.PubKeyBytes,
                        )
                        if err != nil {
                                return fmt.Errorf("unable to build channel "+
                                        "policies: %w", err)
                        }

                        edges = append(edges, ChannelEdge{
                                Info:    edge,
                                Policy1: p1,
                                Policy2: p2,
                                Node1:   node1,
                                Node2:   node2,
                        })
                }

                return nil
        }, func() {
                edges = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to fetch channels: %w", err)
        }

        return edges, nil
}

// FilterKnownChanIDs takes a set of channel IDs and return the subset of chan
// ID's that we don't know and are not known zombies of the passed set. In other
// words, we perform a set difference of our set of chan ID's and the ones
// passed in. This method can be used by callers to determine the set of
// channels another peer knows of that we don't. The ChannelUpdateInfos for the
// known zombies is also returned.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) FilterKnownChanIDs(chansInfo []ChannelUpdateInfo) ([]uint64,
        []ChannelUpdateInfo, error) {

        var (
                ctx          = context.TODO()
                newChanIDs   []uint64
                knownZombies []ChannelUpdateInfo
        )
        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                for _, chanInfo := range chansInfo {
                        channelID := chanInfo.ShortChannelID.ToUint64()
                        var chanIDB [8]byte
                        byteOrder.PutUint64(chanIDB[:], channelID)

                        // TODO(elle): potentially optimize this by using
                        //  sqlc.slice() once that works for both SQLite and
                        //  Postgres.
                        _, err := db.GetChannelBySCID(
                                ctx, sqlc.GetChannelBySCIDParams{
                                        Version: int16(ProtocolV1),
                                        Scid:    chanIDB[:],
                                },
                        )
                        if err == nil {
                                continue
                        } else if !errors.Is(err, sql.ErrNoRows) {
                                return fmt.Errorf("unable to fetch channel: %w",
                                        err)
                        }

                        isZombie, err := db.IsZombieChannel(
                                ctx, sqlc.IsZombieChannelParams{
                                        Scid:    chanIDB[:],
                                        Version: int16(ProtocolV1),
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to fetch zombie "+
                                        "channel: %w", err)
                        }

                        if isZombie {
                                knownZombies = append(knownZombies, chanInfo)

                                continue
                        }

                        newChanIDs = append(newChanIDs, channelID)
                }

                return nil
        }, func() {
                newChanIDs = nil
                knownZombies = nil
        })
        if err != nil {
                return nil, nil, fmt.Errorf("unable to fetch channels: %w", err)
        }

        return newChanIDs, knownZombies, nil
}

// PruneGraphNodes is a garbage collection method which attempts to prune out
// any nodes from the channel graph that are currently unconnected. This ensure
// that we only maintain a graph of reachable nodes. In the event that a pruned
// node gains more channels, it will be re-added back to the graph.
//
// NOTE: this prunes nodes across protocol versions. It will never prune the
// source nodes.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) PruneGraphNodes() ([]route.Vertex, error) {
        var ctx = context.TODO()

        var prunedNodes []route.Vertex
        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                var err error
                prunedNodes, err = s.pruneGraphNodes(ctx, db)

                return err
        }, func() {
                prunedNodes = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to prune nodes: %w", err)
        }

        return prunedNodes, nil
}

// PruneGraph prunes newly closed channels from the channel graph in response
// to a new block being solved on the network. Any transactions which spend the
// funding output of any known channels within he graph will be deleted.
// Additionally, the "prune tip", or the last block which has been used to
// prune the graph is stored so callers can ensure the graph is fully in sync
// with the current UTXO state. A slice of channels that have been closed by
// the target block along with any pruned nodes are returned if the function
// succeeds without error.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) PruneGraph(spentOutputs []*wire.OutPoint,
        blockHash *chainhash.Hash, blockHeight uint32) (
        []*models.ChannelEdgeInfo, []route.Vertex, error) {

        ctx := context.TODO()

        s.cacheMu.Lock()
        defer s.cacheMu.Unlock()

        var (
                closedChans []*models.ChannelEdgeInfo
                prunedNodes []route.Vertex
        )
        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                for _, outpoint := range spentOutputs {
                        // TODO(elle): potentially optimize this by using
                        //  sqlc.slice() once that works for both SQLite and
                        //  Postgres.
                        //
                        // NOTE: this fetches channels for all protocol
                        // versions.
                        row, err := db.GetChannelByOutpoint(
                                ctx, outpoint.String(),
                        )
                        if errors.Is(err, sql.ErrNoRows) {
                                continue
                        } else if err != nil {
                                return fmt.Errorf("unable to fetch channel: %w",
                                        err)
                        }

                        node1, node2, err := buildNodeVertices(
                                row.Node1Pubkey, row.Node2Pubkey,
                        )
                        if err != nil {
                                return err
                        }

                        info, err := getAndBuildEdgeInfo(
                                ctx, db, s.cfg.ChainHash, row.Channel.ID,
                                row.Channel, node1, node2,
                        )
                        if err != nil {
                                return err
                        }

                        err = db.DeleteChannel(ctx, row.Channel.ID)
                        if err != nil {
                                return fmt.Errorf("unable to delete "+
                                        "channel: %w", err)
                        }

                        closedChans = append(closedChans, info)
                }

                err := db.UpsertPruneLogEntry(
                        ctx, sqlc.UpsertPruneLogEntryParams{
                                BlockHash:   blockHash[:],
                                BlockHeight: int64(blockHeight),
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to insert prune log "+
                                "entry: %w", err)
                }

                // Now that we've pruned some channels, we'll also prune any
                // nodes that no longer have any channels.
                prunedNodes, err = s.pruneGraphNodes(ctx, db)
                if err != nil {
                        return fmt.Errorf("unable to prune graph nodes: %w",
                                err)
                }

                return nil
        }, func() {
                prunedNodes = nil
                closedChans = nil
        })
        if err != nil {
                return nil, nil, fmt.Errorf("unable to prune graph: %w", err)
        }

        for _, channel := range closedChans {
                s.rejectCache.remove(channel.ChannelID)
                s.chanCache.remove(channel.ChannelID)
        }

        return closedChans, prunedNodes, nil
}

// ChannelView returns the verifiable edge information for each active channel
// within the known channel graph. The set of UTXOs (along with their scripts)
// returned are the ones that need to be watched on chain to detect channel
// closes on the resident blockchain.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) ChannelView() ([]EdgePoint, error) {
        var (
                ctx        = context.TODO()
                edgePoints []EdgePoint
        )

        handleChannel := func(db SQLQueries,
                channel sqlc.ListChannelsPaginatedRow) error {

                pkScript, err := genMultiSigP2WSH(
                        channel.BitcoinKey1, channel.BitcoinKey2,
                )
                if err != nil {
                        return err
                }

                op, err := wire.NewOutPointFromString(channel.Outpoint)
                if err != nil {
                        return err
                }

                edgePoints = append(edgePoints, EdgePoint{
                        FundingPkScript: pkScript,
                        OutPoint:        *op,
                })

                return nil
        }

        err := s.db.ExecTx(ctx, sqldb.ReadTxOpt(), func(db SQLQueries) error {
                lastID := int64(-1)
                for {
                        rows, err := db.ListChannelsPaginated(
                                ctx, sqlc.ListChannelsPaginatedParams{
                                        Version: int16(ProtocolV1),
                                        ID:      lastID,
                                        Limit:   pageSize,
                                },
                        )
                        if err != nil {
                                return err
                        }

                        if len(rows) == 0 {
                                break
                        }

                        for _, row := range rows {
                                err := handleChannel(db, row)
                                if err != nil {
                                        return err
                                }

                                lastID = row.ID
                        }
                }

                return nil
        }, func() {
                edgePoints = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to fetch channel view: %w", err)
        }

        return edgePoints, nil
}

// PruneTip returns the block height and hash of the latest block that has been
// used to prune channels in the graph. Knowing the "prune tip" allows callers
// to tell if the graph is currently in sync with the current best known UTXO
// state.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) PruneTip() (*chainhash.Hash, uint32, error) {
        var (
                ctx       = context.TODO()
                tipHash   chainhash.Hash
                tipHeight uint32
        )
        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                pruneTip, err := db.GetPruneTip(ctx)
                if errors.Is(err, sql.ErrNoRows) {
                        return ErrGraphNeverPruned
                } else if err != nil {
                        return fmt.Errorf("unable to fetch prune tip: %w", err)
                }

                tipHash = chainhash.Hash(pruneTip.BlockHash)
                tipHeight = uint32(pruneTip.BlockHeight)

                return nil
        }, sqldb.NoOpReset)
        if err != nil {
                return nil, 0, err
        }

        return &tipHash, tipHeight, nil
}

// pruneGraphNodes deletes any node in the DB that doesn't have a channel.
//
// NOTE: this prunes nodes across protocol versions. It will never prune the
// source nodes.
func (s *SQLStore) pruneGraphNodes(ctx context.Context,
        db SQLQueries) ([]route.Vertex, error) {

        // Fetch all un-connected nodes from the database.
        // NOTE: this will not include any nodes that are listed in the
        // source table.
        nodes, err := db.GetUnconnectedNodes(ctx)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch unconnected nodes: %w",
                        err)
        }

        prunedNodes := make([]route.Vertex, 0, len(nodes))
        for _, node := range nodes {
                // TODO(elle): update to use sqlc.slice() once that works.
                if err = db.DeleteNode(ctx, node.ID); err != nil {
                        return nil, fmt.Errorf("unable to delete "+
                                "node(id=%d): %w", node.ID, err)
                }

                pubKey, err := route.NewVertexFromBytes(node.PubKey)
                if err != nil {
                        return nil, fmt.Errorf("unable to parse pubkey "+
                                "for node(id=%d): %w", node.ID, err)
                }

                prunedNodes = append(prunedNodes, pubKey)
        }

        return prunedNodes, nil
}

// DisconnectBlockAtHeight is used to indicate that the block specified
// by the passed height has been disconnected from the main chain. This
// will "rewind" the graph back to the height below, deleting channels
// that are no longer confirmed from the graph. The prune log will be
// set to the last prune height valid for the remaining chain.
// Channels that were removed from the graph resulting from the
// disconnected block are returned.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) DisconnectBlockAtHeight(height uint32) (
        []*models.ChannelEdgeInfo, error) {

        ctx := context.TODO()

        var (
                // Every channel having a ShortChannelID starting at 'height'
                // will no longer be confirmed.
                startShortChanID = lnwire.ShortChannelID{
                        BlockHeight: height,
                }

                // Delete everything after this height from the db up until the
                // SCID alias range.
                endShortChanID = aliasmgr.StartingAlias

                removedChans []*models.ChannelEdgeInfo
        )

        var chanIDStart [8]byte
        byteOrder.PutUint64(chanIDStart[:], startShortChanID.ToUint64())
        var chanIDEnd [8]byte
        byteOrder.PutUint64(chanIDEnd[:], endShortChanID.ToUint64())

        err := s.db.ExecTx(ctx, sqldb.WriteTxOpt(), func(db SQLQueries) error {
                rows, err := db.GetChannelsBySCIDRange(
                        ctx, sqlc.GetChannelsBySCIDRangeParams{
                                StartScid: chanIDStart[:],
                                EndScid:   chanIDEnd[:],
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to fetch channels: %w", err)
                }

                for _, row := range rows {
                        node1, node2, err := buildNodeVertices(
                                row.Node1PubKey, row.Node2PubKey,
                        )
                        if err != nil {
                                return err
                        }

                        channel, err := getAndBuildEdgeInfo(
                                ctx, db, s.cfg.ChainHash, row.Channel.ID,
                                row.Channel, node1, node2,
                        )
                        if err != nil {
                                return err
                        }

                        err = db.DeleteChannel(ctx, row.Channel.ID)
                        if err != nil {
                                return fmt.Errorf("unable to delete "+
                                        "channel: %w", err)
                        }

                        removedChans = append(removedChans, channel)
                }

                return db.DeletePruneLogEntriesInRange(
                        ctx, sqlc.DeletePruneLogEntriesInRangeParams{
                                StartHeight: int64(height),
                                EndHeight:   int64(endShortChanID.BlockHeight),
                        },
                )
        }, func() {
                removedChans = nil
        })
        if err != nil {
                return nil, fmt.Errorf("unable to disconnect block at "+
                        "height: %w", err)
        }

        for _, channel := range removedChans {
                s.rejectCache.remove(channel.ChannelID)
                s.chanCache.remove(channel.ChannelID)
        }

        return removedChans, nil
}

// forEachNodeDirectedChannel iterates through all channels of a given
// node, executing the passed callback on the directed edge representing the
// channel and its incoming policy. If the node is not found, no error is
// returned.
func forEachNodeDirectedChannel(ctx context.Context, db SQLQueries,
        nodePub route.Vertex, cb func(channel *DirectedChannel) error) error {

        toNodeCallback := func() route.Vertex {
                return nodePub
        }

        dbID, err := db.GetNodeIDByPubKey(
                ctx, sqlc.GetNodeIDByPubKeyParams{
                        Version: int16(ProtocolV1),
                        PubKey:  nodePub[:],
                },
        )
        if errors.Is(err, sql.ErrNoRows) {
                return nil
        } else if err != nil {
                return fmt.Errorf("unable to fetch node: %w", err)
        }

        rows, err := db.ListChannelsByNodeID(
                ctx, sqlc.ListChannelsByNodeIDParams{
                        Version: int16(ProtocolV1),
                        NodeID1: dbID,
                },
        )
        if err != nil {
                return fmt.Errorf("unable to fetch channels: %w", err)
        }

        // Exit early if there are no channels for this node so we don't
        // do the unnecessary feature fetching.
        if len(rows) == 0 {
                return nil
        }

        features, err := getNodeFeatures(ctx, db, dbID)
        if err != nil {
                return fmt.Errorf("unable to fetch node features: %w", err)
        }

        for _, row := range rows {
                node1, node2, err := buildNodeVertices(
                        row.Node1Pubkey, row.Node2Pubkey,
                )
                if err != nil {
                        return fmt.Errorf("unable to build node vertices: %w",
                                err)
                }

                edge := buildCacheableChannelInfo(row.Channel, node1, node2)

                dbPol1, dbPol2, err := extractChannelPolicies(row)
                if err != nil {
                        return err
                }

                var p1, p2 *models.CachedEdgePolicy
                if dbPol1 != nil {
                        policy1, err := buildChanPolicy(
                                *dbPol1, edge.ChannelID, nil, node2, true,
                        )
                        if err != nil {
                                return err
                        }

                        p1 = models.NewCachedPolicy(policy1)
                }
                if dbPol2 != nil {
                        policy2, err := buildChanPolicy(
                                *dbPol2, edge.ChannelID, nil, node1, false,
                        )
                        if err != nil {
                                return err
                        }

                        p2 = models.NewCachedPolicy(policy2)
                }

                // Determine the outgoing and incoming policy for this
                // channel and node combo.
                outPolicy, inPolicy := p1, p2
                if p1 != nil && node2 == nodePub {
                        outPolicy, inPolicy = p2, p1
                } else if p2 != nil && node1 != nodePub {
                        outPolicy, inPolicy = p2, p1
                }

                var cachedInPolicy *models.CachedEdgePolicy
                if inPolicy != nil {
                        cachedInPolicy = inPolicy
                        cachedInPolicy.ToNodePubKey = toNodeCallback
                        cachedInPolicy.ToNodeFeatures = features
                }

                directedChannel := &DirectedChannel{
                        ChannelID:    edge.ChannelID,
                        IsNode1:      nodePub == edge.NodeKey1Bytes,
                        OtherNode:    edge.NodeKey2Bytes,
                        Capacity:     edge.Capacity,
                        OutPolicySet: outPolicy != nil,
                        InPolicy:     cachedInPolicy,
                }
                if outPolicy != nil {
                        outPolicy.InboundFee.WhenSome(func(fee lnwire.Fee) {
                                directedChannel.InboundFee = fee
                        })
                }

                if nodePub == edge.NodeKey2Bytes {
                        directedChannel.OtherNode = edge.NodeKey1Bytes
                }

                if err := cb(directedChannel); err != nil {
                        return err
                }
        }

        return nil
}

// forEachNodeCacheable fetches all V1 node IDs and pub keys from the database,
// and executes the provided callback for each node.
func forEachNodeCacheable(ctx context.Context, db SQLQueries,
        cb func(nodeID int64, nodePub route.Vertex) error) error {

        var lastID int64

        for {
                nodes, err := db.ListNodeIDsAndPubKeys(
                        ctx, sqlc.ListNodeIDsAndPubKeysParams{
                                Version: int16(ProtocolV1),
                                ID:      lastID,
                                Limit:   pageSize,
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to fetch nodes: %w", err)
                }

                if len(nodes) == 0 {
                        break
                }

                for _, node := range nodes {
                        var pub route.Vertex
                        copy(pub[:], node.PubKey)

                        if err := cb(node.ID, pub); err != nil {
                                return fmt.Errorf("forEachNodeCacheable "+
                                        "callback failed for node(id=%d): %w",
                                        node.ID, err)
                        }

                        lastID = node.ID
                }
        }

        return nil
}

// forEachNodeChannel iterates through all channels of a node, executing
// the passed callback on each. The call-back is provided with the channel's
// edge information, the outgoing policy and the incoming policy for the
// channel and node combo.
func forEachNodeChannel(ctx context.Context, db SQLQueries,
        chain chainhash.Hash, id int64, cb func(*models.ChannelEdgeInfo,
                *models.ChannelEdgePolicy,
                *models.ChannelEdgePolicy) error) error {

        // Get all the V1 channels for this node.Add commentMore actions
        rows, err := db.ListChannelsByNodeID(
                ctx, sqlc.ListChannelsByNodeIDParams{
                        Version: int16(ProtocolV1),
                        NodeID1: id,
                },
        )
        if err != nil {
                return fmt.Errorf("unable to fetch channels: %w", err)
        }

        // Call the call-back for each channel and its known policies.
        for _, row := range rows {
                node1, node2, err := buildNodeVertices(
                        row.Node1Pubkey, row.Node2Pubkey,
                )
                if err != nil {
                        return fmt.Errorf("unable to build node vertices: %w",
                                err)
                }

                edge, err := getAndBuildEdgeInfo(
                        ctx, db, chain, row.Channel.ID, row.Channel, node1,
                        node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel info: %w",
                                err)
                }

                dbPol1, dbPol2, err := extractChannelPolicies(row)
                if err != nil {
                        return fmt.Errorf("unable to extract channel "+
                                "policies: %w", err)
                }

                p1, p2, err := getAndBuildChanPolicies(
                        ctx, db, dbPol1, dbPol2, edge.ChannelID, node1, node2,
                )
                if err != nil {
                        return fmt.Errorf("unable to build channel "+
                                "policies: %w", err)
                }

                // Determine the outgoing and incoming policy for this
                // channel and node combo.
                p1ToNode := row.Channel.NodeID2
                p2ToNode := row.Channel.NodeID1
                outPolicy, inPolicy := p1, p2
                if (p1 != nil && p1ToNode == id) ||
                        (p2 != nil && p2ToNode != id) {

                        outPolicy, inPolicy = p2, p1
                }

                if err := cb(edge, outPolicy, inPolicy); err != nil {
                        return err
                }
        }

        return nil
}

// updateChanEdgePolicy upserts the channel policy info we have stored for
// a channel we already know of.
func updateChanEdgePolicy(ctx context.Context, tx SQLQueries,
        edge *models.ChannelEdgePolicy) (route.Vertex, route.Vertex, bool,
        error) {

        var (
                node1Pub, node2Pub route.Vertex
                isNode1            bool
                chanIDB            = channelIDToBytes(edge.ChannelID)
        )

        // Check that this edge policy refers to a channel that we already
        // know of. We do this explicitly so that we can return the appropriate
        // ErrEdgeNotFound error if the channel doesn't exist, rather than
        // abort the transaction which would abort the entire batch.
        dbChan, err := tx.GetChannelAndNodesBySCID(
                ctx, sqlc.GetChannelAndNodesBySCIDParams{
                        Scid:    chanIDB[:],
                        Version: int16(ProtocolV1),
                },
        )
        if errors.Is(err, sql.ErrNoRows) {
                return node1Pub, node2Pub, false, ErrEdgeNotFound
        } else if err != nil {
                return node1Pub, node2Pub, false, fmt.Errorf("unable to "+
                        "fetch channel(%v): %w", edge.ChannelID, err)
        }

        copy(node1Pub[:], dbChan.Node1PubKey)
        copy(node2Pub[:], dbChan.Node2PubKey)

        // Figure out which node this edge is from.
        isNode1 = edge.ChannelFlags&lnwire.ChanUpdateDirection == 0
        nodeID := dbChan.NodeID1
        if !isNode1 {
                nodeID = dbChan.NodeID2
        }

        var (
                inboundBase sql.NullInt64
                inboundRate sql.NullInt64
        )
        edge.InboundFee.WhenSome(func(fee lnwire.Fee) {
                inboundRate = sqldb.SQLInt64(fee.FeeRate)
                inboundBase = sqldb.SQLInt64(fee.BaseFee)
        })

        id, err := tx.UpsertEdgePolicy(ctx, sqlc.UpsertEdgePolicyParams{
                Version:     int16(ProtocolV1),
                ChannelID:   dbChan.ID,
                NodeID:      nodeID,
                Timelock:    int32(edge.TimeLockDelta),
                FeePpm:      int64(edge.FeeProportionalMillionths),
                BaseFeeMsat: int64(edge.FeeBaseMSat),
                MinHtlcMsat: int64(edge.MinHTLC),
                LastUpdate:  sqldb.SQLInt64(edge.LastUpdate.Unix()),
                Disabled: sql.NullBool{
                        Valid: true,
                        Bool:  edge.IsDisabled(),
                },
                MaxHtlcMsat: sql.NullInt64{
                        Valid: edge.MessageFlags.HasMaxHtlc(),
                        Int64: int64(edge.MaxHTLC),
                },
                InboundBaseFeeMsat:      inboundBase,
                InboundFeeRateMilliMsat: inboundRate,
                Signature:               edge.SigBytes,
        })
        if err != nil {
                return node1Pub, node2Pub, isNode1,
                        fmt.Errorf("unable to upsert edge policy: %w", err)
        }

        // Convert the flat extra opaque data into a map of TLV types to
        // values.
        extra, err := marshalExtraOpaqueData(edge.ExtraOpaqueData)
        if err != nil {
                return node1Pub, node2Pub, false, fmt.Errorf("unable to "+
                        "marshal extra opaque data: %w", err)
        }

        // Update the channel policy's extra signed fields.
        err = upsertChanPolicyExtraSignedFields(ctx, tx, id, extra)
        if err != nil {
                return node1Pub, node2Pub, false, fmt.Errorf("inserting chan "+
                        "policy extra TLVs: %w", err)
        }

        return node1Pub, node2Pub, isNode1, nil
}

// getNodeByPubKey attempts to look up a target node by its public key.
func getNodeByPubKey(ctx context.Context, db SQLQueries,
        pubKey route.Vertex) (int64, *models.LightningNode, error) {

        dbNode, err := db.GetNodeByPubKey(
                ctx, sqlc.GetNodeByPubKeyParams{
                        Version: int16(ProtocolV1),
                        PubKey:  pubKey[:],
                },
        )
        if errors.Is(err, sql.ErrNoRows) {
                return 0, nil, ErrGraphNodeNotFound
        } else if err != nil {
                return 0, nil, fmt.Errorf("unable to fetch node: %w", err)
        }

        node, err := buildNode(ctx, db, &dbNode)
        if err != nil {
                return 0, nil, fmt.Errorf("unable to build node: %w", err)
        }

        return dbNode.ID, node, nil
}

// buildCacheableChannelInfo builds a models.CachedEdgeInfo instance from the
// provided database channel row and the public keys of the two nodes
// involved in the channel.
func buildCacheableChannelInfo(dbChan sqlc.Channel, node1Pub,
        node2Pub route.Vertex) *models.CachedEdgeInfo {

        return &models.CachedEdgeInfo{
                ChannelID:     byteOrder.Uint64(dbChan.Scid),
                NodeKey1Bytes: node1Pub,
                NodeKey2Bytes: node2Pub,
                Capacity:      btcutil.Amount(dbChan.Capacity.Int64),
        }
}

// buildNode constructs a LightningNode instance from the given database node
// record. The node's features, addresses and extra signed fields are also
// fetched from the database and set on the node.
func buildNode(ctx context.Context, db SQLQueries, dbNode *sqlc.Node) (
        *models.LightningNode, error) {

        if dbNode.Version != int16(ProtocolV1) {
                return nil, fmt.Errorf("unsupported node version: %d",
                        dbNode.Version)
        }

        var pub [33]byte
        copy(pub[:], dbNode.PubKey)

        node := &models.LightningNode{
                PubKeyBytes: pub,
                Features:    lnwire.EmptyFeatureVector(),
                LastUpdate:  time.Unix(0, 0),
        }

        if len(dbNode.Signature) == 0 {
                return node, nil
        }

        node.HaveNodeAnnouncement = true
        node.AuthSigBytes = dbNode.Signature
        node.Alias = dbNode.Alias.String
        node.LastUpdate = time.Unix(dbNode.LastUpdate.Int64, 0)

        var err error
        if dbNode.Color.Valid {
                node.Color, err = DecodeHexColor(dbNode.Color.String)
                if err != nil {
                        return nil, fmt.Errorf("unable to decode color: %w",
                                err)
                }
        }

        // Fetch the node's features.
        node.Features, err = getNodeFeatures(ctx, db, dbNode.ID)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch node(%d) "+
                        "features: %w", dbNode.ID, err)
        }

        // Fetch the node's addresses.
        _, node.Addresses, err = getNodeAddresses(ctx, db, pub[:])
        if err != nil {
                return nil, fmt.Errorf("unable to fetch node(%d) "+
                        "addresses: %w", dbNode.ID, err)
        }

        // Fetch the node's extra signed fields.
        extraTLVMap, err := getNodeExtraSignedFields(ctx, db, dbNode.ID)
        if err != nil {
                return nil, fmt.Errorf("unable to fetch node(%d) "+
                        "extra signed fields: %w", dbNode.ID, err)
        }

        recs, err := lnwire.CustomRecords(extraTLVMap).Serialize()
        if err != nil {
                return nil, fmt.Errorf("unable to serialize extra signed "+
                        "fields: %w", err)
        }

        if len(recs) != 0 {
                node.ExtraOpaqueData = recs
        }

        return node, nil
}

// getNodeFeatures fetches the feature bits and constructs the feature vector
// for a node with the given DB ID.
func getNodeFeatures(ctx context.Context, db SQLQueries,
        nodeID int64) (*lnwire.FeatureVector, error) {

        rows, err := db.GetNodeFeatures(ctx, nodeID)
        if err != nil {
                return nil, fmt.Errorf("unable to get node(%d) features: %w",
                        nodeID, err)
        }

        features := lnwire.EmptyFeatureVector()
        for _, feature := range rows {
                features.Set(lnwire.FeatureBit(feature.FeatureBit))
        }

        return features, nil
}

// getNodeExtraSignedFields fetches the extra signed fields for a node with the
// given DB ID.
func getNodeExtraSignedFields(ctx context.Context, db SQLQueries,
        nodeID int64) (map[uint64][]byte, error) {

        fields, err := db.GetExtraNodeTypes(ctx, nodeID)
        if err != nil {
                return nil, fmt.Errorf("unable to get node(%d) extra "+
                        "signed fields: %w", nodeID, err)
        }

        extraFields := make(map[uint64][]byte)
        for _, field := range fields {
                extraFields[uint64(field.Type)] = field.Value
        }

        return extraFields, nil
}

// upsertNode upserts the node record into the database. If the node already
// exists, then the node's information is updated. If the node doesn't exist,
// then a new node is created. The node's features, addresses and extra TLV
// types are also updated. The node's DB ID is returned.
func upsertNode(ctx context.Context, db SQLQueries,
        node *models.LightningNode) (int64, error) {

        params := sqlc.UpsertNodeParams{
                Version: int16(ProtocolV1),
                PubKey:  node.PubKeyBytes[:],
        }

        if node.HaveNodeAnnouncement {
                params.LastUpdate = sqldb.SQLInt64(node.LastUpdate.Unix())
                params.Color = sqldb.SQLStr(EncodeHexColor(node.Color))
                params.Alias = sqldb.SQLStr(node.Alias)
                params.Signature = node.AuthSigBytes
        }

        nodeID, err := db.UpsertNode(ctx, params)
        if err != nil {
                return 0, fmt.Errorf("upserting node(%x): %w", node.PubKeyBytes,
                        err)
        }

        // We can exit here if we don't have the announcement yet.
        if !node.HaveNodeAnnouncement {
                return nodeID, nil
        }

        // Update the node's features.
        err = upsertNodeFeatures(ctx, db, nodeID, node.Features)
        if err != nil {
                return 0, fmt.Errorf("inserting node features: %w", err)
        }

        // Update the node's addresses.
        err = upsertNodeAddresses(ctx, db, nodeID, node.Addresses)
        if err != nil {
                return 0, fmt.Errorf("inserting node addresses: %w", err)
        }

        // Convert the flat extra opaque data into a map of TLV types to
        // values.
        extra, err := marshalExtraOpaqueData(node.ExtraOpaqueData)
        if err != nil {
                return 0, fmt.Errorf("unable to marshal extra opaque data: %w",
                        err)
        }

        // Update the node's extra signed fields.
        err = upsertNodeExtraSignedFields(ctx, db, nodeID, extra)
        if err != nil {
                return 0, fmt.Errorf("inserting node extra TLVs: %w", err)
        }

        return nodeID, nil
}

// upsertNodeFeatures updates the node's features node_features table. This
// includes deleting any feature bits no longer present and inserting any new
// feature bits. If the feature bit does not yet exist in the features table,
// then an entry is created in that table first.
func upsertNodeFeatures(ctx context.Context, db SQLQueries, nodeID int64,
        features *lnwire.FeatureVector) error {

        // Get any existing features for the node.
        existingFeatures, err := db.GetNodeFeatures(ctx, nodeID)
        if err != nil && !errors.Is(err, sql.ErrNoRows) {
                return err
        }

        // Copy the nodes latest set of feature bits.
        newFeatures := make(map[int32]struct{})
        if features != nil {
                for feature := range features.Features() {
                        newFeatures[int32(feature)] = struct{}{}
                }
        }

        // For any current feature that already exists in the DB, remove it from
        // the in-memory map. For any existing feature that does not exist in
        // the in-memory map, delete it from the database.
        for _, feature := range existingFeatures {
                // The feature is still present, so there are no updates to be
                // made.
                if _, ok := newFeatures[feature.FeatureBit]; ok {
                        delete(newFeatures, feature.FeatureBit)
                        continue
                }

                // The feature is no longer present, so we remove it from the
                // database.
                err := db.DeleteNodeFeature(ctx, sqlc.DeleteNodeFeatureParams{
                        NodeID:     nodeID,
                        FeatureBit: feature.FeatureBit,
                })
                if err != nil {
                        return fmt.Errorf("unable to delete node(%d) "+
                                "feature(%v): %w", nodeID, feature.FeatureBit,
                                err)
                }
        }

        // Any remaining entries in newFeatures are new features that need to be
        // added to the database for the first time.
        for feature := range newFeatures {
                err = db.InsertNodeFeature(ctx, sqlc.InsertNodeFeatureParams{
                        NodeID:     nodeID,
                        FeatureBit: feature,
                })
                if err != nil {
                        return fmt.Errorf("unable to insert node(%d) "+
                                "feature(%v): %w", nodeID, feature, err)
                }
        }

        return nil
}

// fetchNodeFeatures fetches the features for a node with the given public key.
func fetchNodeFeatures(ctx context.Context, queries SQLQueries,
        nodePub route.Vertex) (*lnwire.FeatureVector, error) {

        rows, err := queries.GetNodeFeaturesByPubKey(
                ctx, sqlc.GetNodeFeaturesByPubKeyParams{
                        PubKey:  nodePub[:],
                        Version: int16(ProtocolV1),
                },
        )
        if err != nil {
                return nil, fmt.Errorf("unable to get node(%s) features: %w",
                        nodePub, err)
        }

        features := lnwire.EmptyFeatureVector()
        for _, bit := range rows {
                features.Set(lnwire.FeatureBit(bit))
        }

        return features, nil
}

// dbAddressType is an enum type that represents the different address types
// that we store in the node_addresses table. The address type determines how
// the address is to be serialised/deserialize.
type dbAddressType uint8

const (
        addressTypeIPv4   dbAddressType = 1
        addressTypeIPv6   dbAddressType = 2
        addressTypeTorV2  dbAddressType = 3
        addressTypeTorV3  dbAddressType = 4
        addressTypeOpaque dbAddressType = math.MaxInt8
)

// upsertNodeAddresses updates the node's addresses in the database. This
// includes deleting any existing addresses and inserting the new set of
// addresses. The deletion is necessary since the ordering of the addresses may
// change, and we need to ensure that the database reflects the latest set of
// addresses so that at the time of reconstructing the node announcement, the
// order is preserved and the signature over the message remains valid.
func upsertNodeAddresses(ctx context.Context, db SQLQueries, nodeID int64,
        addresses []net.Addr) error {

        // Delete any existing addresses for the node. This is required since
        // even if the new set of addresses is the same, the ordering may have
        // changed for a given address type.
        err := db.DeleteNodeAddresses(ctx, nodeID)
        if err != nil {
                return fmt.Errorf("unable to delete node(%d) addresses: %w",
                        nodeID, err)
        }

        // Copy the nodes latest set of addresses.
        newAddresses := map[dbAddressType][]string{
                addressTypeIPv4:   {},
                addressTypeIPv6:   {},
                addressTypeTorV2:  {},
                addressTypeTorV3:  {},
                addressTypeOpaque: {},
        }
        addAddr := func(t dbAddressType, addr net.Addr) {
                newAddresses[t] = append(newAddresses[t], addr.String())
        }

        for _, address := range addresses {
                switch addr := address.(type) {
                case *net.TCPAddr:
                        if ip4 := addr.IP.To4(); ip4 != nil {
                                addAddr(addressTypeIPv4, addr)
                        } else if ip6 := addr.IP.To16(); ip6 != nil {
                                addAddr(addressTypeIPv6, addr)
                        } else {
                                return fmt.Errorf("unhandled IP address: %v",
                                        addr)
                        }

                case *tor.OnionAddr:
                        switch len(addr.OnionService) {
                        case tor.V2Len:
                                addAddr(addressTypeTorV2, addr)
                        case tor.V3Len:
                                addAddr(addressTypeTorV3, addr)
                        default:
                                return fmt.Errorf("invalid length for a tor " +
                                        "address")
                        }

                case *lnwire.OpaqueAddrs:
                        addAddr(addressTypeOpaque, addr)

                default:
                        return fmt.Errorf("unhandled address type: %T", addr)
                }
        }

        // Any remaining entries in newAddresses are new addresses that need to
        // be added to the database for the first time.
        for addrType, addrList := range newAddresses {
                for position, addr := range addrList {
                        err := db.InsertNodeAddress(
                                ctx, sqlc.InsertNodeAddressParams{
                                        NodeID:   nodeID,
                                        Type:     int16(addrType),
                                        Address:  addr,
                                        Position: int32(position),
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to insert "+
                                        "node(%d) address(%v): %w", nodeID,
                                        addr, err)
                        }
                }
        }

        return nil
}

// getNodeAddresses fetches the addresses for a node with the given public key.
func getNodeAddresses(ctx context.Context, db SQLQueries, nodePub []byte) (bool,
        []net.Addr, error) {

        // GetNodeAddressesByPubKey ensures that the addresses for a given type
        // are returned in the same order as they were inserted.
        rows, err := db.GetNodeAddressesByPubKey(
                ctx, sqlc.GetNodeAddressesByPubKeyParams{
                        Version: int16(ProtocolV1),
                        PubKey:  nodePub,
                },
        )
        if err != nil {
                return false, nil, err
        }

        // GetNodeAddressesByPubKey uses a left join so there should always be
        // at least one row returned if the node exists even if it has no
        // addresses.
        if len(rows) == 0 {
                return false, nil, nil
        }

        addresses := make([]net.Addr, 0, len(rows))
        for _, addr := range rows {
                if !(addr.Type.Valid && addr.Address.Valid) {
                        continue
                }

                address := addr.Address.String

                switch dbAddressType(addr.Type.Int16) {
                case addressTypeIPv4:
                        tcp, err := net.ResolveTCPAddr("tcp4", address)
                        if err != nil {
                                return false, nil, nil
                        }
                        tcp.IP = tcp.IP.To4()

                        addresses = append(addresses, tcp)

                case addressTypeIPv6:
                        tcp, err := net.ResolveTCPAddr("tcp6", address)
                        if err != nil {
                                return false, nil, nil
                        }
                        addresses = append(addresses, tcp)

                case addressTypeTorV3, addressTypeTorV2:
                        service, portStr, err := net.SplitHostPort(address)
                        if err != nil {
                                return false, nil, fmt.Errorf("unable to "+
                                        "split tor v3 address: %v",
                                        addr.Address)
                        }

                        port, err := strconv.Atoi(portStr)
                        if err != nil {
                                return false, nil, err
                        }

                        addresses = append(addresses, &tor.OnionAddr{
                                OnionService: service,
                                Port:         port,
                        })

                case addressTypeOpaque:
                        opaque, err := hex.DecodeString(address)
                        if err != nil {
                                return false, nil, fmt.Errorf("unable to "+
                                        "decode opaque address: %v", addr)
                        }

                        addresses = append(addresses, &lnwire.OpaqueAddrs{
                                Payload: opaque,
                        })

                default:
                        return false, nil, fmt.Errorf("unknown address "+
                                "type: %v", addr.Type)
                }
        }

        return true, addresses, nil
}

// upsertNodeExtraSignedFields updates the node's extra signed fields in the
// database. This includes updating any existing types, inserting any new types,
// and deleting any types that are no longer present.
func upsertNodeExtraSignedFields(ctx context.Context, db SQLQueries,
        nodeID int64, extraFields map[uint64][]byte) error {

        // Get any existing extra signed fields for the node.
        existingFields, err := db.GetExtraNodeTypes(ctx, nodeID)
        if err != nil {
                return err
        }

        // Make a lookup map of the existing field types so that we can use it
        // to keep track of any fields we should delete.
        m := make(map[uint64]bool)
        for _, field := range existingFields {
                m[uint64(field.Type)] = true
        }

        // For all the new fields, we'll upsert them and remove them from the
        // map of existing fields.
        for tlvType, value := range extraFields {
                err = db.UpsertNodeExtraType(
                        ctx, sqlc.UpsertNodeExtraTypeParams{
                                NodeID: nodeID,
                                Type:   int64(tlvType),
                                Value:  value,
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to upsert node(%d) extra "+
                                "signed field(%v): %w", nodeID, tlvType, err)
                }

                // Remove the field from the map of existing fields if it was
                // present.
                delete(m, tlvType)
        }

        // For all the fields that are left in the map of existing fields, we'll
        // delete them as they are no longer present in the new set of fields.
        for tlvType := range m {
                err = db.DeleteExtraNodeType(
                        ctx, sqlc.DeleteExtraNodeTypeParams{
                                NodeID: nodeID,
                                Type:   int64(tlvType),
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to delete node(%d) extra "+
                                "signed field(%v): %w", nodeID, tlvType, err)
                }
        }

        return nil
}

// srcNodeInfo holds the information about the source node of the graph.
type srcNodeInfo struct {
        // id is the DB level ID of the source node entry in the "nodes" table.
        id int64

        // pub is the public key of the source node.
        pub route.Vertex
}

// getSourceNode returns the DB node ID and pub key of the source node for the
// specified protocol version.
func (s *SQLStore) getSourceNode(ctx context.Context, db SQLQueries,
        version ProtocolVersion) (int64, route.Vertex, error) {

        s.srcNodeMu.Lock()
        defer s.srcNodeMu.Unlock()

        // If we already have the source node ID and pub key cached, then
        // return them.
        if info, ok := s.srcNodes[version]; ok {
                return info.id, info.pub, nil
        }

        var pubKey route.Vertex

        nodes, err := db.GetSourceNodesByVersion(ctx, int16(version))
        if err != nil {
                return 0, pubKey, fmt.Errorf("unable to fetch source node: %w",
                        err)
        }

        if len(nodes) == 0 {
                return 0, pubKey, ErrSourceNodeNotSet
        } else if len(nodes) > 1 {
                return 0, pubKey, fmt.Errorf("multiple source nodes for "+
                        "protocol %s found", version)
        }

        copy(pubKey[:], nodes[0].PubKey)

        s.srcNodes[version] = &srcNodeInfo{
                id:  nodes[0].NodeID,
                pub: pubKey,
        }

        return nodes[0].NodeID, pubKey, nil
}

// marshalExtraOpaqueData takes a flat byte slice parses it as a TLV stream.
// This then produces a map from TLV type to value. If the input is not a
// valid TLV stream, then an error is returned.
func marshalExtraOpaqueData(data []byte) (map[uint64][]byte, error) {
        r := bytes.NewReader(data)

        tlvStream, err := tlv.NewStream()
        if err != nil {
                return nil, err
        }

        // Since ExtraOpaqueData is provided by a potentially malicious peer,
        // pass it into the P2P decoding variant.
        parsedTypes, err := tlvStream.DecodeWithParsedTypesP2P(r)
        if err != nil {
                return nil, fmt.Errorf("%w: %w", ErrParsingExtraTLVBytes, err)
        }
        if len(parsedTypes) == 0 {
                return nil, nil
        }

        records := make(map[uint64][]byte)
        for k, v := range parsedTypes {
                records[uint64(k)] = v
        }

        return records, nil
}

// insertChannel inserts a new channel record into the database.
func insertChannel(ctx context.Context, db SQLQueries,
        edge *models.ChannelEdgeInfo) error {

        chanIDB := channelIDToBytes(edge.ChannelID)

        // Make sure that the channel doesn't already exist. We do this
        // explicitly instead of relying on catching a unique constraint error
        // because relying on SQL to throw that error would abort the entire
        // batch of transactions.
        _, err := db.GetChannelBySCID(
                ctx, sqlc.GetChannelBySCIDParams{
                        Scid:    chanIDB[:],
                        Version: int16(ProtocolV1),
                },
        )
        if err == nil {
                return ErrEdgeAlreadyExist
        } else if !errors.Is(err, sql.ErrNoRows) {
                return fmt.Errorf("unable to fetch channel: %w", err)
        }

        // Make sure that at least a "shell" entry for each node is present in
        // the nodes table.
        node1DBID, err := maybeCreateShellNode(ctx, db, edge.NodeKey1Bytes)
        if err != nil {
                return fmt.Errorf("unable to create shell node: %w", err)
        }

        node2DBID, err := maybeCreateShellNode(ctx, db, edge.NodeKey2Bytes)
        if err != nil {
                return fmt.Errorf("unable to create shell node: %w", err)
        }

        var capacity sql.NullInt64
        if edge.Capacity != 0 {
                capacity = sqldb.SQLInt64(int64(edge.Capacity))
        }

        createParams := sqlc.CreateChannelParams{
                Version:     int16(ProtocolV1),
                Scid:        chanIDB[:],
                NodeID1:     node1DBID,
                NodeID2:     node2DBID,
                Outpoint:    edge.ChannelPoint.String(),
                Capacity:    capacity,
                BitcoinKey1: edge.BitcoinKey1Bytes[:],
                BitcoinKey2: edge.BitcoinKey2Bytes[:],
        }

        if edge.AuthProof != nil {
                proof := edge.AuthProof

                createParams.Node1Signature = proof.NodeSig1Bytes
                createParams.Node2Signature = proof.NodeSig2Bytes
                createParams.Bitcoin1Signature = proof.BitcoinSig1Bytes
                createParams.Bitcoin2Signature = proof.BitcoinSig2Bytes
        }

        // Insert the new channel record.
        dbChanID, err := db.CreateChannel(ctx, createParams)
        if err != nil {
                return err
        }

        // Insert any channel features.
        if len(edge.Features) != 0 {
                chanFeatures := lnwire.NewRawFeatureVector()
                err := chanFeatures.Decode(bytes.NewReader(edge.Features))
                if err != nil {
                        return err
                }

                fv := lnwire.NewFeatureVector(chanFeatures, lnwire.Features)
                for feature := range fv.Features() {
                        err = db.InsertChannelFeature(
                                ctx, sqlc.InsertChannelFeatureParams{
                                        ChannelID:  dbChanID,
                                        FeatureBit: int32(feature),
                                },
                        )
                        if err != nil {
                                return fmt.Errorf("unable to insert "+
                                        "channel(%d) feature(%v): %w", dbChanID,
                                        feature, err)
                        }
                }
        }

        // Finally, insert any extra TLV fields in the channel announcement.
        extra, err := marshalExtraOpaqueData(edge.ExtraOpaqueData)
        if err != nil {
                return fmt.Errorf("unable to marshal extra opaque data: %w",
                        err)
        }

        for tlvType, value := range extra {
                err := db.CreateChannelExtraType(
                        ctx, sqlc.CreateChannelExtraTypeParams{
                                ChannelID: dbChanID,
                                Type:      int64(tlvType),
                                Value:     value,
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to upsert channel(%d) extra "+
                                "signed field(%v): %w", edge.ChannelID,
                                tlvType, err)
                }
        }

        return nil
}

// maybeCreateShellNode checks if a shell node entry exists for the
// given public key. If it does not exist, then a new shell node entry is
// created. The ID of the node is returned. A shell node only has a protocol
// version and public key persisted.
func maybeCreateShellNode(ctx context.Context, db SQLQueries,
        pubKey route.Vertex) (int64, error) {

        dbNode, err := db.GetNodeByPubKey(
                ctx, sqlc.GetNodeByPubKeyParams{
                        PubKey:  pubKey[:],
                        Version: int16(ProtocolV1),
                },
        )
        // The node exists. Return the ID.
        if err == nil {
                return dbNode.ID, nil
        } else if !errors.Is(err, sql.ErrNoRows) {
                return 0, err
        }

        // Otherwise, the node does not exist, so we create a shell entry for
        // it.
        id, err := db.UpsertNode(ctx, sqlc.UpsertNodeParams{
                Version: int16(ProtocolV1),
                PubKey:  pubKey[:],
        })
        if err != nil {
                return 0, fmt.Errorf("unable to create shell node: %w", err)
        }

        return id, nil
}

// upsertChanPolicyExtraSignedFields updates the policy's extra signed fields in
// the database. This includes deleting any existing types and then inserting
// the new types.
func upsertChanPolicyExtraSignedFields(ctx context.Context, db SQLQueries,
        chanPolicyID int64, extraFields map[uint64][]byte) error {

        // Delete all existing extra signed fields for the channel policy.
        err := db.DeleteChannelPolicyExtraTypes(ctx, chanPolicyID)
        if err != nil {
                return fmt.Errorf("unable to delete "+
                        "existing policy extra signed fields for policy %d: %w",
                        chanPolicyID, err)
        }

        // Insert all new extra signed fields for the channel policy.
        for tlvType, value := range extraFields {
                err = db.InsertChanPolicyExtraType(
                        ctx, sqlc.InsertChanPolicyExtraTypeParams{
                                ChannelPolicyID: chanPolicyID,
                                Type:            int64(tlvType),
                                Value:           value,
                        },
                )
                if err != nil {
                        return fmt.Errorf("unable to insert "+
                                "channel_policy(%d) extra signed field(%v): %w",
                                chanPolicyID, tlvType, err)
                }
        }

        return nil
}

// getAndBuildEdgeInfo builds a models.ChannelEdgeInfo instance from the
// provided dbChanRow and also fetches any other required information
// to construct the edge info.
func getAndBuildEdgeInfo(ctx context.Context, db SQLQueries,
        chain chainhash.Hash, dbChanID int64, dbChan sqlc.Channel, node1,
        node2 route.Vertex) (*models.ChannelEdgeInfo, error) {

        if dbChan.Version != int16(ProtocolV1) {
                return nil, fmt.Errorf("unsupported channel version: %d",
                        dbChan.Version)
        }

        fv, extras, err := getChanFeaturesAndExtras(
                ctx, db, dbChanID,
        )
        if err != nil {
                return nil, err
        }

        op, err := wire.NewOutPointFromString(dbChan.Outpoint)
        if err != nil {
                return nil, err
        }

        var featureBuf bytes.Buffer
        if err := fv.Encode(&featureBuf); err != nil {
                return nil, fmt.Errorf("unable to encode features: %w", err)
        }

        recs, err := lnwire.CustomRecords(extras).Serialize()
        if err != nil {
                return nil, fmt.Errorf("unable to serialize extra signed "+
                        "fields: %w", err)
        }
        if recs == nil {
                recs = make([]byte, 0)
        }

        var btcKey1, btcKey2 route.Vertex
        copy(btcKey1[:], dbChan.BitcoinKey1)
        copy(btcKey2[:], dbChan.BitcoinKey2)

        channel := &models.ChannelEdgeInfo{
                ChainHash:        chain,
                ChannelID:        byteOrder.Uint64(dbChan.Scid),
                NodeKey1Bytes:    node1,
                NodeKey2Bytes:    node2,
                BitcoinKey1Bytes: btcKey1,
                BitcoinKey2Bytes: btcKey2,
                ChannelPoint:     *op,
                Capacity:         btcutil.Amount(dbChan.Capacity.Int64),
                Features:         featureBuf.Bytes(),
                ExtraOpaqueData:  recs,
        }

        // We always set all the signatures at the same time, so we can
        // safely check if one signature is present to determine if we have the
        // rest of the signatures for the auth proof.
        if len(dbChan.Bitcoin1Signature) > 0 {
                channel.AuthProof = &models.ChannelAuthProof{
                        NodeSig1Bytes:    dbChan.Node1Signature,
                        NodeSig2Bytes:    dbChan.Node2Signature,
                        BitcoinSig1Bytes: dbChan.Bitcoin1Signature,
                        BitcoinSig2Bytes: dbChan.Bitcoin2Signature,
                }
        }

        return channel, nil
}

// buildNodeVertices is a helper that converts raw node public keys
// into route.Vertex instances.
func buildNodeVertices(node1Pub, node2Pub []byte) (route.Vertex,
        route.Vertex, error) {

        node1Vertex, err := route.NewVertexFromBytes(node1Pub)
        if err != nil {
                return route.Vertex{}, route.Vertex{}, fmt.Errorf("unable to "+
                        "create vertex from node1 pubkey: %w", err)
        }

        node2Vertex, err := route.NewVertexFromBytes(node2Pub)
        if err != nil {
                return route.Vertex{}, route.Vertex{}, fmt.Errorf("unable to "+
                        "create vertex from node2 pubkey: %w", err)
        }

        return node1Vertex, node2Vertex, nil
}

// getChanFeaturesAndExtras fetches the channel features and extra TLV types
// for a channel with the given ID.
func getChanFeaturesAndExtras(ctx context.Context, db SQLQueries,
        id int64) (*lnwire.FeatureVector, map[uint64][]byte, error) {

        rows, err := db.GetChannelFeaturesAndExtras(ctx, id)
        if err != nil {
                return nil, nil, fmt.Errorf("unable to fetch channel "+
                        "features and extras: %w", err)
        }

        var (
                fv     = lnwire.EmptyFeatureVector()
                extras = make(map[uint64][]byte)
        )
        for _, row := range rows {
                if row.IsFeature {
                        fv.Set(lnwire.FeatureBit(row.FeatureBit))

                        continue
                }

                tlvType, ok := row.ExtraKey.(int64)
                if !ok {
                        return nil, nil, fmt.Errorf("unexpected type for "+
                                "TLV type: %T", row.ExtraKey)
                }

                valueBytes, ok := row.Value.([]byte)
                if !ok {
                        return nil, nil, fmt.Errorf("unexpected type for "+
                                "Value: %T", row.Value)
                }

                extras[uint64(tlvType)] = valueBytes
        }

        return fv, extras, nil
}

// getAndBuildChanPolicies uses the given sqlc.ChannelPolicy and also retrieves
// all the extra info required to build the complete models.ChannelEdgePolicy
// types. It returns two policies, which may be nil if the provided
// sqlc.ChannelPolicy records are nil.
func getAndBuildChanPolicies(ctx context.Context, db SQLQueries,
        dbPol1, dbPol2 *sqlc.ChannelPolicy, channelID uint64, node1,
        node2 route.Vertex) (*models.ChannelEdgePolicy,
        *models.ChannelEdgePolicy, error) {

        if dbPol1 == nil && dbPol2 == nil {
                return nil, nil, nil
        }

        var (
                policy1ID int64
                policy2ID int64
        )
        if dbPol1 != nil {
                policy1ID = dbPol1.ID
        }
        if dbPol2 != nil {
                policy2ID = dbPol2.ID
        }
        rows, err := db.GetChannelPolicyExtraTypes(
                ctx, sqlc.GetChannelPolicyExtraTypesParams{
                        ID:   policy1ID,
                        ID_2: policy2ID,
                },
        )
        if err != nil {
                return nil, nil, err
        }

        var (
                dbPol1Extras = make(map[uint64][]byte)
                dbPol2Extras = make(map[uint64][]byte)
        )
        for _, row := range rows {
                switch row.PolicyID {
                case policy1ID:
                        dbPol1Extras[uint64(row.Type)] = row.Value
                case policy2ID:
                        dbPol2Extras[uint64(row.Type)] = row.Value
                default:
                        return nil, nil, fmt.Errorf("unexpected policy ID %d "+
                                "in row: %v", row.PolicyID, row)
                }
        }

        var pol1, pol2 *models.ChannelEdgePolicy
        if dbPol1 != nil {
                pol1, err = buildChanPolicy(
                        *dbPol1, channelID, dbPol1Extras, node2, true,
                )
                if err != nil {
                        return nil, nil, err
                }
        }
        if dbPol2 != nil {
                pol2, err = buildChanPolicy(
                        *dbPol2, channelID, dbPol2Extras, node1, false,
                )
                if err != nil {
                        return nil, nil, err
                }
        }

        return pol1, pol2, nil
}

// buildChanPolicy builds a models.ChannelEdgePolicy instance from the
// provided sqlc.ChannelPolicy and other required information.
func buildChanPolicy(dbPolicy sqlc.ChannelPolicy, channelID uint64,
        extras map[uint64][]byte, toNode route.Vertex,
        isNode1 bool) (*models.ChannelEdgePolicy, error) {

        recs, err := lnwire.CustomRecords(extras).Serialize()
        if err != nil {
                return nil, fmt.Errorf("unable to serialize extra signed "+
                        "fields: %w", err)
        }

        var msgFlags lnwire.ChanUpdateMsgFlags
        if dbPolicy.MaxHtlcMsat.Valid {
                msgFlags |= lnwire.ChanUpdateRequiredMaxHtlc
        }

        var chanFlags lnwire.ChanUpdateChanFlags
        if !isNode1 {
                chanFlags |= lnwire.ChanUpdateDirection
        }
        if dbPolicy.Disabled.Bool {
                chanFlags |= lnwire.ChanUpdateDisabled
        }

        var inboundFee fn.Option[lnwire.Fee]
        if dbPolicy.InboundFeeRateMilliMsat.Valid ||
                dbPolicy.InboundBaseFeeMsat.Valid {

                inboundFee = fn.Some(lnwire.Fee{
                        BaseFee: int32(dbPolicy.InboundBaseFeeMsat.Int64),
                        FeeRate: int32(dbPolicy.InboundFeeRateMilliMsat.Int64),
                })
        }

        return &models.ChannelEdgePolicy{
                SigBytes:  dbPolicy.Signature,
                ChannelID: channelID,
                LastUpdate: time.Unix(
                        dbPolicy.LastUpdate.Int64, 0,
                ),
                MessageFlags:  msgFlags,
                ChannelFlags:  chanFlags,
                TimeLockDelta: uint16(dbPolicy.Timelock),
                MinHTLC: lnwire.MilliSatoshi(
                        dbPolicy.MinHtlcMsat,
                ),
                MaxHTLC: lnwire.MilliSatoshi(
                        dbPolicy.MaxHtlcMsat.Int64,
                ),
                FeeBaseMSat: lnwire.MilliSatoshi(
                        dbPolicy.BaseFeeMsat,
                ),
                FeeProportionalMillionths: lnwire.MilliSatoshi(dbPolicy.FeePpm),
                ToNode:                    toNode,
                InboundFee:                inboundFee,
                ExtraOpaqueData:           recs,
        }, nil
}

// buildNodes builds the models.LightningNode instances for the
// given row which is expected to be a sqlc type that contains node information.
func buildNodes(ctx context.Context, db SQLQueries, dbNode1,
        dbNode2 sqlc.Node) (*models.LightningNode, *models.LightningNode,
        error) {

        node1, err := buildNode(ctx, db, &dbNode1)
        if err != nil {
                return nil, nil, err
        }

        node2, err := buildNode(ctx, db, &dbNode2)
        if err != nil {
                return nil, nil, err
        }

        return node1, node2, nil
}

// extractChannelPolicies extracts the sqlc.ChannelPolicy records from the give
// row which is expected to be a sqlc type that contains channel policy
// information. It returns two policies, which may be nil if the policy
// information is not present in the row.
//
//nolint:ll,dupl,funlen
func extractChannelPolicies(row any) (*sqlc.ChannelPolicy, *sqlc.ChannelPolicy,
        error) {

        var policy1, policy2 *sqlc.ChannelPolicy
        switch r := row.(type) {
        case sqlc.GetChannelByOutpointWithPoliciesRow:
                if r.Policy1ID.Valid {
                        policy1 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy1ID.Int64,
                                Version:                 r.Policy1Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy1NodeID.Int64,
                                Timelock:                r.Policy1Timelock.Int32,
                                FeePpm:                  r.Policy1FeePpm.Int64,
                                BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy1MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy1MaxHtlcMsat,
                                LastUpdate:              r.Policy1LastUpdate,
                                InboundBaseFeeMsat:      r.Policy1InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy1InboundFeeRateMilliMsat,
                                Disabled:                r.Policy1Disabled,
                                Signature:               r.Policy1Signature,
                        }
                }
                if r.Policy2ID.Valid {
                        policy2 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy2ID.Int64,
                                Version:                 r.Policy2Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy2NodeID.Int64,
                                Timelock:                r.Policy2Timelock.Int32,
                                FeePpm:                  r.Policy2FeePpm.Int64,
                                BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy2MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy2MaxHtlcMsat,
                                LastUpdate:              r.Policy2LastUpdate,
                                InboundBaseFeeMsat:      r.Policy2InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy2InboundFeeRateMilliMsat,
                                Disabled:                r.Policy2Disabled,
                                Signature:               r.Policy2Signature,
                        }
                }

                return policy1, policy2, nil

        case sqlc.GetChannelBySCIDWithPoliciesRow:
                if r.Policy1ID.Valid {
                        policy1 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy1ID.Int64,
                                Version:                 r.Policy1Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy1NodeID.Int64,
                                Timelock:                r.Policy1Timelock.Int32,
                                FeePpm:                  r.Policy1FeePpm.Int64,
                                BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy1MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy1MaxHtlcMsat,
                                LastUpdate:              r.Policy1LastUpdate,
                                InboundBaseFeeMsat:      r.Policy1InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy1InboundFeeRateMilliMsat,
                                Disabled:                r.Policy1Disabled,
                                Signature:               r.Policy1Signature,
                        }
                }
                if r.Policy2ID.Valid {
                        policy2 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy2ID.Int64,
                                Version:                 r.Policy2Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy2NodeID.Int64,
                                Timelock:                r.Policy2Timelock.Int32,
                                FeePpm:                  r.Policy2FeePpm.Int64,
                                BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy2MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy2MaxHtlcMsat,
                                LastUpdate:              r.Policy2LastUpdate,
                                InboundBaseFeeMsat:      r.Policy2InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy2InboundFeeRateMilliMsat,
                                Disabled:                r.Policy2Disabled,
                                Signature:               r.Policy2Signature,
                        }
                }

                return policy1, policy2, nil

        case sqlc.GetChannelsByPolicyLastUpdateRangeRow:
                if r.Policy1ID.Valid {
                        policy1 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy1ID.Int64,
                                Version:                 r.Policy1Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy1NodeID.Int64,
                                Timelock:                r.Policy1Timelock.Int32,
                                FeePpm:                  r.Policy1FeePpm.Int64,
                                BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy1MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy1MaxHtlcMsat,
                                LastUpdate:              r.Policy1LastUpdate,
                                InboundBaseFeeMsat:      r.Policy1InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy1InboundFeeRateMilliMsat,
                                Disabled:                r.Policy1Disabled,
                                Signature:               r.Policy1Signature,
                        }
                }
                if r.Policy2ID.Valid {
                        policy2 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy2ID.Int64,
                                Version:                 r.Policy2Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy2NodeID.Int64,
                                Timelock:                r.Policy2Timelock.Int32,
                                FeePpm:                  r.Policy2FeePpm.Int64,
                                BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy2MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy2MaxHtlcMsat,
                                LastUpdate:              r.Policy2LastUpdate,
                                InboundBaseFeeMsat:      r.Policy2InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy2InboundFeeRateMilliMsat,
                                Disabled:                r.Policy2Disabled,
                                Signature:               r.Policy2Signature,
                        }
                }

                return policy1, policy2, nil

        case sqlc.ListChannelsByNodeIDRow:
                if r.Policy1ID.Valid {
                        policy1 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy1ID.Int64,
                                Version:                 r.Policy1Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy1NodeID.Int64,
                                Timelock:                r.Policy1Timelock.Int32,
                                FeePpm:                  r.Policy1FeePpm.Int64,
                                BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy1MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy1MaxHtlcMsat,
                                LastUpdate:              r.Policy1LastUpdate,
                                InboundBaseFeeMsat:      r.Policy1InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy1InboundFeeRateMilliMsat,
                                Disabled:                r.Policy1Disabled,
                                Signature:               r.Policy1Signature,
                        }
                }
                if r.Policy2ID.Valid {
                        policy2 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy2ID.Int64,
                                Version:                 r.Policy2Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy2NodeID.Int64,
                                Timelock:                r.Policy2Timelock.Int32,
                                FeePpm:                  r.Policy2FeePpm.Int64,
                                BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy2MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy2MaxHtlcMsat,
                                LastUpdate:              r.Policy2LastUpdate,
                                InboundBaseFeeMsat:      r.Policy2InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy2InboundFeeRateMilliMsat,
                                Disabled:                r.Policy2Disabled,
                                Signature:               r.Policy2Signature,
                        }
                }

                return policy1, policy2, nil

        case sqlc.ListChannelsWithPoliciesPaginatedRow:
                if r.Policy1ID.Valid {
                        policy1 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy1ID.Int64,
                                Version:                 r.Policy1Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy1NodeID.Int64,
                                Timelock:                r.Policy1Timelock.Int32,
                                FeePpm:                  r.Policy1FeePpm.Int64,
                                BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy1MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy1MaxHtlcMsat,
                                LastUpdate:              r.Policy1LastUpdate,
                                InboundBaseFeeMsat:      r.Policy1InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy1InboundFeeRateMilliMsat,
                                Disabled:                r.Policy1Disabled,
                                Signature:               r.Policy1Signature,
                        }
                }
                if r.Policy2ID.Valid {
                        policy2 = &sqlc.ChannelPolicy{
                                ID:                      r.Policy2ID.Int64,
                                Version:                 r.Policy2Version.Int16,
                                ChannelID:               r.Channel.ID,
                                NodeID:                  r.Policy2NodeID.Int64,
                                Timelock:                r.Policy2Timelock.Int32,
                                FeePpm:                  r.Policy2FeePpm.Int64,
                                BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,
                                MinHtlcMsat:             r.Policy2MinHtlcMsat.Int64,
                                MaxHtlcMsat:             r.Policy2MaxHtlcMsat,
                                LastUpdate:              r.Policy2LastUpdate,
                                InboundBaseFeeMsat:      r.Policy2InboundBaseFeeMsat,
                                InboundFeeRateMilliMsat: r.Policy2InboundFeeRateMilliMsat,
                                Disabled:                r.Policy2Disabled,
                                Signature:               r.Policy2Signature,
                        }
                }

                return policy1, policy2, nil
        default:
                return nil, nil, fmt.Errorf("unexpected row type in "+
                        "extractChannelPolicies: %T", r)
        }
}

// channelIDToBytes converts a channel ID (SCID) to a byte array
// representation.
func channelIDToBytes(channelID uint64) [8]byte {
        var chanIDB [8]byte
        byteOrder.PutUint64(chanIDB[:], channelID)

        return chanIDB
}

lightningnetwork / lnd / 15872517631

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