15293384865

Committed 28 May 2025 06:45AM UTC coverage: 58.362% (-10.4%) from 68.776%

Build # 15293384865

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web-flow

Commit Message

Merge pull request #9866 from ellemouton/graphSQL7-nodes-tables

sqldb+graph/db: add node related tables and implement some node CRUD

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/graph/db/sql_store.go

package graphdb

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

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/lightningnetwork/lnd/batch"
        "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"
)

// 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)
        GetNodesByLastUpdateRange(ctx context.Context, arg sqlc.GetNodesByLastUpdateRangeParams) ([]sqlc.Node, error)
        DeleteNodeByPubKey(ctx context.Context, arg sqlc.DeleteNodeByPubKeyParams) (sql.Result, 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)
}

// 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 {
        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]

        // 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)

// NewSQLStore creates a new SQLStore instance given an open BatchedSQLQueries
// storage backend.
func NewSQLStore(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{
                db:          db,
                KVStore:     kvStore,
                rejectCache: newRejectCache(opts.RejectCacheSize),
                chanCache:   newChannelCache(opts.ChannelCacheSize),
        }

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

        return s, nil
}

// TxOptions defines the set of db txn options the SQLQueries
// understands.
type TxOptions struct {
        // readOnly governs if a read only transaction is needed or not.
        readOnly bool
}

// ReadOnly returns true if the transaction should be read only.
//
// NOTE: This implements the TxOptions.
func (a *TxOptions) ReadOnly() bool {
        return a.readOnly
}

// NewReadTx creates a new read transaction option set.
func NewReadTx() *TxOptions {
        return &TxOptions{
                readOnly: true,
        }
}

// 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(node *models.LightningNode,
        opts ...batch.SchedulerOption) error {

        ctx := context.TODO()

        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(pubKey route.Vertex) (
        *models.LightningNode, error) {

        ctx := context.TODO()

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

                return err
        }, func() {})
        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(pubKey [33]byte) (time.Time, bool,
        error) {

        ctx := context.TODO()

        var (
                readTx     = NewReadTx()
                exists     bool
                lastUpdate time.Time
        )
        err := s.db.ExecTx(ctx, readTx, 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
        }, func() {})
        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(nodePub *btcec.PublicKey) (bool, []net.Addr,
        error) {

        ctx := context.TODO()

        var (
                readTx    = NewReadTx()
                addresses []net.Addr
                known     bool
        )
        err := s.db.ExecTx(ctx, readTx, 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
        }, func() {})
        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(pubKey route.Vertex) error {
        ctx := context.TODO()

        var writeTxOpts TxOptions
        err := s.db.ExecTx(ctx, &writeTxOpts, 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
        }, func() {})
        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)
}

// LookupAlias attempts to return the alias as advertised by the target node.
//
// NOTE: part of the V1Store interface.
func (s *SQLStore) LookupAlias(pub *btcec.PublicKey) (string, error) {
        var (
                ctx    = context.TODO()
                readTx = NewReadTx()
                alias  string
        )
        err := s.db.ExecTx(ctx, readTx, 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
        }, func() {})
        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() (*models.LightningNode, error) {
        ctx := context.TODO()

        var (
                readTx = NewReadTx()
                node   *models.LightningNode
        )
        err := s.db.ExecTx(ctx, readTx, func(db SQLQueries) error {
                _, nodePub, err := 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
        }, func() {})
        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(node *models.LightningNode) error {
        ctx := context.TODO()
        var writeTxOpts TxOptions

        return s.db.ExecTx(ctx, &writeTxOpts, 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 := 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)
        }, func() {})
}

// 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 (
                readTx = NewReadTx()
                nodes  []models.LightningNode
        )
        err := s.db.ExecTx(ctx, readTx, 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
        }, func() {})
        if err != nil {
                return nil, fmt.Errorf("unable to fetch nodes: %w", err)
        }

        return nodes, 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
}

// 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),
                ExtraOpaqueData: make([]byte, 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
        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
}

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

        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)

        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, 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
}

lightningnetwork / lnd / 15293384865

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