10207481183

Committed 01 Aug 2024 11:52PM UTC coverage: 58.679% (+0.09%) from 58.591%

Build # 10207481183

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push

github

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web-flow

Commit Message

Merge pull request #8836 from hieblmi/payment-failure-reason-cancel

routing: add payment failure reason `FailureReasonCancel`

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0.0

/lntest/harness_assertion.go

package lntest

import (
        "bytes"
        "context"
        "crypto/rand"
        "encoding/hex"
        "encoding/json"
        "fmt"
        "math"
        "sort"
        "strings"
        "time"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcec/v2/schnorr"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/txscript"
        "github.com/btcsuite/btcd/wire"
        "github.com/lightningnetwork/lnd/channeldb"
        "github.com/lightningnetwork/lnd/lnrpc"
        "github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
        "github.com/lightningnetwork/lnd/lnrpc/routerrpc"
        "github.com/lightningnetwork/lnd/lnrpc/walletrpc"
        "github.com/lightningnetwork/lnd/lntest/miner"
        "github.com/lightningnetwork/lnd/lntest/node"
        "github.com/lightningnetwork/lnd/lntest/rpc"
        "github.com/lightningnetwork/lnd/lntest/wait"
        "github.com/lightningnetwork/lnd/lntypes"
        "github.com/stretchr/testify/require"
        "google.golang.org/protobuf/proto"
)

// FindChannelOption is a functional type for an option that modifies a
// ListChannelsRequest.
type ListChannelOption func(r *lnrpc.ListChannelsRequest)

// WithPeerAliasLookup is an option for setting the peer alias lookup flag on a
// ListChannelsRequest.
func WithPeerAliasLookup() ListChannelOption {
        return func(r *lnrpc.ListChannelsRequest) {
                r.PeerAliasLookup = true
        }
}

// WaitForBlockchainSync waits until the node is synced to chain.
func (h *HarnessTest) WaitForBlockchainSync(hn *node.HarnessNode) {
        err := wait.NoError(func() error {
                resp := hn.RPC.GetInfo()
                if resp.SyncedToChain {
                        return nil
                }

                return fmt.Errorf("%s is not synced to chain", hn.Name())
        }, DefaultTimeout)

        require.NoError(h, err, "timeout waiting for blockchain sync")
}

// WaitForBlockchainSyncTo waits until the node is synced to bestBlock.
func (h *HarnessTest) WaitForBlockchainSyncTo(hn *node.HarnessNode,
        bestBlock *wire.MsgBlock) {

        bestBlockHash := bestBlock.BlockHash().String()
        err := wait.NoError(func() error {
                resp := hn.RPC.GetInfo()
                if resp.SyncedToChain {
                        if resp.BlockHash == bestBlockHash {
                                return nil
                        }

                        return fmt.Errorf("%s's backend is synced to the "+
                                "wrong block (expected=%s, actual=%s)",
                                hn.Name(), bestBlockHash, resp.BlockHash)
                }

                return fmt.Errorf("%s is not synced to chain", hn.Name())
        }, DefaultTimeout)

        require.NoError(h, err, "timeout waiting for blockchain sync")
}

// AssertPeerConnected asserts that the given node b is connected to a.
func (h *HarnessTest) AssertPeerConnected(a, b *node.HarnessNode) {
        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                resp := a.RPC.ListPeers()

                // If node B is seen in the ListPeers response from node A,
                // then we can return true as the connection has been fully
                // established.
                for _, peer := range resp.Peers {
                        if peer.PubKey == b.PubKeyStr {
                                return nil
                        }
                }

                return fmt.Errorf("%s not found in %s's ListPeers",
                        b.Name(), a.Name())
        }, DefaultTimeout)

        require.NoError(h, err, "unable to connect %s to %s, got error: "+
                "peers not connected within %v seconds",
                a.Name(), b.Name(), DefaultTimeout)
}

// ConnectNodes creates a connection between the two nodes and asserts the
// connection is succeeded.
func (h *HarnessTest) ConnectNodes(a, b *node.HarnessNode) {
        bobInfo := b.RPC.GetInfo()

        req := &lnrpc.ConnectPeerRequest{
                Addr: &lnrpc.LightningAddress{
                        Pubkey: bobInfo.IdentityPubkey,
                        Host:   b.Cfg.P2PAddr(),
                },
        }
        a.RPC.ConnectPeer(req)
        h.AssertPeerConnected(a, b)
}

// ConnectNodesPerm creates a persistent connection between the two nodes and
// asserts the connection is succeeded.
func (h *HarnessTest) ConnectNodesPerm(a, b *node.HarnessNode) {
        bobInfo := b.RPC.GetInfo()

        req := &lnrpc.ConnectPeerRequest{
                Addr: &lnrpc.LightningAddress{
                        Pubkey: bobInfo.IdentityPubkey,
                        Host:   b.Cfg.P2PAddr(),
                },
                Perm: true,
        }
        a.RPC.ConnectPeer(req)
        h.AssertPeerConnected(a, b)
}

// DisconnectNodes disconnects the given two nodes and asserts the
// disconnection is succeeded. The request is made from node a and sent to node
// b.
func (h *HarnessTest) DisconnectNodes(a, b *node.HarnessNode) {
        bobInfo := b.RPC.GetInfo()
        a.RPC.DisconnectPeer(bobInfo.IdentityPubkey)

        // Assert disconnected.
        h.AssertPeerNotConnected(a, b)
}

// EnsureConnected will try to connect to two nodes, returning no error if they
// are already connected. If the nodes were not connected previously, this will
// behave the same as ConnectNodes. If a pending connection request has already
// been made, the method will block until the two nodes appear in each other's
// peers list, or until the DefaultTimeout expires.
func (h *HarnessTest) EnsureConnected(a, b *node.HarnessNode) {
        // errConnectionRequested is used to signal that a connection was
        // requested successfully, which is distinct from already being
        // connected to the peer.
        errConnectionRequested := "connection request in progress"

        // windowsErr is an error we've seen from windows build where
        // connecting to an already connected node gives such error from the
        // receiver side.
        windowsErr := "An established connection was aborted by the software " +
                "in your host machine."

        tryConnect := func(a, b *node.HarnessNode) error {
                bInfo := b.RPC.GetInfo()

                req := &lnrpc.ConnectPeerRequest{
                        Addr: &lnrpc.LightningAddress{
                                Pubkey: bInfo.IdentityPubkey,
                                Host:   b.Cfg.P2PAddr(),
                        },
                }

                ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
                defer cancel()

                _, err := a.RPC.LN.ConnectPeer(ctxt, req)

                // Request was successful.
                if err == nil {
                        return nil
                }

                // If the two are already connected, we return early with no
                // error.
                if strings.Contains(err.Error(), "already connected to peer") {
                        return nil
                }

                // Otherwise we log the error to console.
                h.Logf("EnsureConnected %s=>%s got err: %v", a.Name(),
                        b.Name(), err)

                // If the connection is in process, we return no error.
                if strings.Contains(err.Error(), errConnectionRequested) {
                        return nil
                }

                // We may get connection refused error if we happens to be in
                // the middle of a previous node disconnection, e.g., a restart
                // from one of the nodes.
                if strings.Contains(err.Error(), "connection refused") {
                        return nil
                }

                // Check for windows error. If Alice connects to Bob, Alice
                // will throw "i/o timeout" and Bob will give windowsErr.
                if strings.Contains(err.Error(), windowsErr) {
                        return nil
                }

                if strings.Contains(err.Error(), "i/o timeout") {
                        return nil
                }

                return err
        }

        // Return any critical errors returned by either alice or bob.
        require.NoError(h, tryConnect(a, b), "connection failed between %s "+
                "and %s", a.Cfg.Name, b.Cfg.Name)

        // When Alice and Bob each makes a connection to the other side at the
        // same time, it's likely neither connections could succeed. Bob's
        // connection will be canceled by Alice since she has an outbound
        // connection to Bob already, and same happens to Alice's. Thus the two
        // connections cancel each other out.
        // TODO(yy): move this back when the above issue is fixed.
        // require.NoError(h, tryConnect(b, a), "connection failed between %s "+
        //         "and %s", a.Cfg.Name, b.Cfg.Name)

        // Otherwise one or both requested a connection, so we wait for the
        // peers lists to reflect the connection.
        h.AssertPeerConnected(a, b)
        h.AssertPeerConnected(b, a)
}

// AssertNumEdges checks that an expected number of edges can be found in the
// node specified.
func (h *HarnessTest) AssertNumEdges(hn *node.HarnessNode,
        expected int, includeUnannounced bool) []*lnrpc.ChannelEdge {

        var edges []*lnrpc.ChannelEdge

        old := hn.State.Edge.Public
        if includeUnannounced {
                old = hn.State.Edge.Total
        }

        err := wait.NoError(func() error {
                req := &lnrpc.ChannelGraphRequest{
                        IncludeUnannounced: includeUnannounced,
                }
                chanGraph := hn.RPC.DescribeGraph(req)
                total := len(chanGraph.Edges)

                if total-old == expected {
                        if expected != 0 {
                                // NOTE: assume edges come in ascending order
                                // that the old edges are at the front of the
                                // slice.
                                edges = chanGraph.Edges[old:]
                        }

                        return nil
                }

                return errNumNotMatched(hn.Name(), "num of channel edges",
                        expected, total-old, total, old)
        }, DefaultTimeout)

        require.NoError(h, err, "timeout while checking for edges")

        return edges
}

// ReceiveOpenChannelUpdate waits until a message is received on the stream or
// the timeout is reached.
func (h *HarnessTest) ReceiveOpenChannelUpdate(
        stream rpc.OpenChanClient) *lnrpc.OpenStatusUpdate {

        update, err := h.receiveOpenChannelUpdate(stream)
        require.NoError(h, err, "received err from open channel stream")

        return update
}

// ReceiveOpenChannelError waits for the expected error during the open channel
// flow from the peer or times out.
func (h *HarnessTest) ReceiveOpenChannelError(
        stream rpc.OpenChanClient, expectedErr error) {

        _, err := h.receiveOpenChannelUpdate(stream)
        require.Contains(h, err.Error(), expectedErr.Error(),
                "error not matched")
}

// receiveOpenChannelUpdate waits until a message or an error is received on
// the stream or the timeout is reached.
//
// TODO(yy): use generics to unify all receiving stream update once go@1.18 is
// used.
func (h *HarnessTest) receiveOpenChannelUpdate(
        stream rpc.OpenChanClient) (*lnrpc.OpenStatusUpdate, error) {

        chanMsg := make(chan *lnrpc.OpenStatusUpdate)
        errChan := make(chan error)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err
                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout waiting for open channel "+
                        "update sent")
                return nil, nil

        case err := <-errChan:
                return nil, err

        case updateMsg := <-chanMsg:
                return updateMsg, nil
        }
}

// WaitForChannelOpenEvent waits for a notification that a channel is open by
// consuming a message from the passed open channel stream.
func (h HarnessTest) WaitForChannelOpenEvent(
        stream rpc.OpenChanClient) *lnrpc.ChannelPoint {

        // Consume one event.
        event := h.ReceiveOpenChannelUpdate(stream)

        resp, ok := event.Update.(*lnrpc.OpenStatusUpdate_ChanOpen)
        require.Truef(h, ok, "expected channel open update, instead got %v",
                resp)

        return resp.ChanOpen.ChannelPoint
}

// AssertTopologyChannelOpen asserts that a given channel outpoint is seen by
// the passed node's network topology.
func (h *HarnessTest) AssertTopologyChannelOpen(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) {

        err := hn.Watcher.WaitForChannelOpen(chanPoint)
        require.NoErrorf(h, err, "%s didn't report channel", hn.Name())
}

// AssertChannelExists asserts that an active channel identified by the
// specified channel point exists from the point-of-view of the node.
func (h *HarnessTest) AssertChannelExists(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint) *lnrpc.Channel {

        return h.assertChannelStatus(hn, cp, true)
}

// AssertChannelActive checks if a channel identified by the specified channel
// point is active.
func (h *HarnessTest) AssertChannelActive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint) *lnrpc.Channel {

        return h.assertChannelStatus(hn, cp, true)
}

// AssertChannelInactive checks if a channel identified by the specified channel
// point is inactive.
func (h *HarnessTest) AssertChannelInactive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint) *lnrpc.Channel {

        return h.assertChannelStatus(hn, cp, false)
}

// assertChannelStatus asserts that a channel identified by the specified
// channel point exists from the point-of-view of the node and that it is either
// active or inactive depending on the value of the active parameter.
func (h *HarnessTest) assertChannelStatus(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, active bool) *lnrpc.Channel {

        var (
                channel *lnrpc.Channel
                err     error
        )

        err = wait.NoError(func() error {
                channel, err = h.findChannel(hn, cp)
                if err != nil {
                        return err
                }

                // Check whether the channel is active, exit early if it is.
                if channel.Active == active {
                        return nil
                }

                return fmt.Errorf("expected channel_active=%v, got %v",
                        active, channel.Active)
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: timeout checking for channel point: %v",
                hn.Name(), cp)

        return channel
}

// AssertOutputScriptClass checks that the specified transaction output has the
// expected script class.
func (h *HarnessTest) AssertOutputScriptClass(tx *btcutil.Tx,
        outputIndex uint32, scriptClass txscript.ScriptClass) {

        require.Greater(h, len(tx.MsgTx().TxOut), int(outputIndex))

        txOut := tx.MsgTx().TxOut[outputIndex]

        pkScript, err := txscript.ParsePkScript(txOut.PkScript)
        require.NoError(h, err)
        require.Equal(h, scriptClass, pkScript.Class())
}

// findChannel tries to find a target channel in the node using the given
// channel point.
func (h *HarnessTest) findChannel(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint,
        opts ...ListChannelOption) (*lnrpc.Channel, error) {

        // Get the funding point.
        fp := h.OutPointFromChannelPoint(chanPoint)

        req := &lnrpc.ListChannelsRequest{}

        for _, opt := range opts {
                opt(req)
        }

        channelInfo := hn.RPC.ListChannels(req)

        // Find the target channel.
        for _, channel := range channelInfo.Channels {
                if channel.ChannelPoint == fp.String() {
                        return channel, nil
                }
        }

        return nil, fmt.Errorf("channel not found using %s", chanPoint)
}

// ReceiveCloseChannelUpdate waits until a message or an error is received on
// the subscribe channel close stream or the timeout is reached.
func (h *HarnessTest) ReceiveCloseChannelUpdate(
        stream rpc.CloseChanClient) (*lnrpc.CloseStatusUpdate, error) {

        chanMsg := make(chan *lnrpc.CloseStatusUpdate)
        errChan := make(chan error)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err
                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout waiting for close channel "+
                        "update sent")

                return nil, nil

        case err := <-errChan:
                return nil, fmt.Errorf("received err from close channel "+
                        "stream: %v", err)

        case updateMsg := <-chanMsg:
                return updateMsg, nil
        }
}

type WaitingCloseChannel *lnrpc.PendingChannelsResponse_WaitingCloseChannel

// AssertChannelWaitingClose asserts that the given channel found in the node
// is waiting close. Returns the WaitingCloseChannel if found.
func (h *HarnessTest) AssertChannelWaitingClose(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) WaitingCloseChannel {

        var target WaitingCloseChannel

        op := h.OutPointFromChannelPoint(chanPoint)

        err := wait.NoError(func() error {
                resp := hn.RPC.PendingChannels()

                for _, waitingClose := range resp.WaitingCloseChannels {
                        if waitingClose.Channel.ChannelPoint == op.String() {
                                target = waitingClose
                                return nil
                        }
                }

                return fmt.Errorf("%v: channel %s not found in waiting close",
                        hn.Name(), op)
        }, DefaultTimeout)
        require.NoError(h, err, "assert channel waiting close timed out")

        return target
}

// AssertTopologyChannelClosed asserts a given channel is closed by checking
// the graph topology subscription of the specified node. Returns the closed
// channel update if found.
func (h *HarnessTest) AssertTopologyChannelClosed(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) *lnrpc.ClosedChannelUpdate {

        closedChan, err := hn.Watcher.WaitForChannelClose(chanPoint)
        require.NoError(h, err, "failed to wait for channel close")

        return closedChan
}

// WaitForChannelCloseEvent waits for a notification that a channel is closed
// by consuming a message from the passed close channel stream. Returns the
// closing txid if found.
func (h HarnessTest) WaitForChannelCloseEvent(
        stream rpc.CloseChanClient) *chainhash.Hash {

        // Consume one event.
        event, err := h.ReceiveCloseChannelUpdate(stream)
        require.NoError(h, err)

        resp, ok := event.Update.(*lnrpc.CloseStatusUpdate_ChanClose)
        require.Truef(h, ok, "expected channel open update, instead got %v",
                resp)

        txid, err := chainhash.NewHash(resp.ChanClose.ClosingTxid)
        require.NoErrorf(h, err, "wrong format found in closing txid: %v",
                resp.ChanClose.ClosingTxid)

        return txid
}

// AssertNumWaitingClose checks that a PendingChannels response from the node
// reports the expected number of waiting close channels.
func (h *HarnessTest) AssertNumWaitingClose(hn *node.HarnessNode,
        num int) []*lnrpc.PendingChannelsResponse_WaitingCloseChannel {

        var channels []*lnrpc.PendingChannelsResponse_WaitingCloseChannel
        oldWaiting := hn.State.CloseChannel.WaitingClose

        err := wait.NoError(func() error {
                resp := hn.RPC.PendingChannels()
                channels = resp.WaitingCloseChannels
                total := len(channels)

                got := total - oldWaiting
                if got == num {
                        return nil
                }

                return errNumNotMatched(hn.Name(), "waiting close channels",
                        num, got, total, oldWaiting)
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: assert waiting close timeout",
                hn.Name())

        return channels
}

// AssertNumPendingForceClose checks that a PendingChannels response from the
// node reports the expected number of pending force close channels.
func (h *HarnessTest) AssertNumPendingForceClose(hn *node.HarnessNode,
        num int) []*lnrpc.PendingChannelsResponse_ForceClosedChannel {

        var channels []*lnrpc.PendingChannelsResponse_ForceClosedChannel
        oldForce := hn.State.CloseChannel.PendingForceClose

        err := wait.NoError(func() error {
                // TODO(yy): we should be able to use `hn.RPC.PendingChannels`
                // here to avoid checking the RPC error. However, we may get a
                // `unable to find arbitrator` error from the rpc point, due to
                // a timing issue in rpcserver,
                // 1. `r.server.chanStateDB.FetchClosedChannels` fetches
                //    the pending force close channel.
                // 2. `r.arbitratorPopulateForceCloseResp` relies on the
                //    channel arbitrator to get the report, and,
                // 3. the arbitrator may be deleted due to the force close
                //    channel being resolved.
                // Somewhere along the line is missing a lock to keep the data
                // consistent.
                req := &lnrpc.PendingChannelsRequest{}
                resp, err := hn.RPC.LN.PendingChannels(h.runCtx, req)
                if err != nil {
                        return fmt.Errorf("PendingChannels got: %w", err)
                }

                channels = resp.PendingForceClosingChannels
                total := len(channels)

                got := total - oldForce
                if got == num {
                        return nil
                }

                return errNumNotMatched(hn.Name(), "pending force close "+
                        "channels", num, got, total, oldForce)
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: assert pending force close timeout",
                hn.Name())

        return channels
}

// AssertStreamChannelCoopClosed reads an update from the close channel client
// stream and asserts that the mempool state and node's topology match a coop
// close. In specific,
// - assert the channel is waiting close and has the expected ChanStatusFlags.
// - assert the mempool has the closing txes and anchor sweeps.
// - mine a block and assert the closing txid is mined.
// - assert the node has zero waiting close channels.
// - assert the node has seen the channel close update.
func (h *HarnessTest) AssertStreamChannelCoopClosed(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, anchors bool,
        stream rpc.CloseChanClient) *chainhash.Hash {

        // Assert the channel is waiting close.
        resp := h.AssertChannelWaitingClose(hn, cp)

        // Assert that the channel is in coop broadcasted.
        require.Contains(h, resp.Channel.ChanStatusFlags,
                channeldb.ChanStatusCoopBroadcasted.String(),
                "channel not coop broadcasted")

        // We'll now, generate a single block, wait for the final close status
        // update, then ensure that the closing transaction was included in the
        // block. If there are anchors, we also expect an anchor sweep.
        expectedTxes := 1
        if anchors {
                expectedTxes = 2
        }
        block := h.MineBlocksAndAssertNumTxes(1, expectedTxes)[0]

        // Consume one close event and assert the closing txid can be found in
        // the block.
        closingTxid := h.WaitForChannelCloseEvent(stream)
        h.AssertTxInBlock(block, closingTxid)

        // We should see zero waiting close channels now.
        h.AssertNumWaitingClose(hn, 0)

        // Finally, check that the node's topology graph has seen this channel
        // closed if it's a public channel.
        if !resp.Channel.Private {
                h.AssertTopologyChannelClosed(hn, cp)
        }

        return closingTxid
}

// AssertStreamChannelForceClosed reads an update from the close channel client
// stream and asserts that the mempool state and node's topology match a local
// force close. In specific,
//   - assert the channel is waiting close and has the expected ChanStatusFlags.
//   - assert the mempool has the closing txes.
//   - mine a block and assert the closing txid is mined.
//   - assert the channel is pending force close.
//   - assert the node has seen the channel close update.
//   - assert there's a pending anchor sweep request once the force close tx is
//     confirmed.
func (h *HarnessTest) AssertStreamChannelForceClosed(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, anchorSweep bool,
        stream rpc.CloseChanClient) *chainhash.Hash {

        // Assert the channel is waiting close.
        resp := h.AssertChannelWaitingClose(hn, cp)

        // Assert that the channel is in local force broadcasted.
        require.Contains(h, resp.Channel.ChanStatusFlags,
                channeldb.ChanStatusLocalCloseInitiator.String(),
                "channel not coop broadcasted")

        // We'll now, generate a single block, wait for the final close status
        // update, then ensure that the closing transaction was included in the
        // block.
        block := h.MineBlocksAndAssertNumTxes(1, 1)[0]

        // Consume one close event and assert the closing txid can be found in
        // the block.
        closingTxid := h.WaitForChannelCloseEvent(stream)
        h.AssertTxInBlock(block, closingTxid)

        // We should see zero waiting close channels and 1 pending force close
        // channels now.
        h.AssertNumWaitingClose(hn, 0)
        h.AssertNumPendingForceClose(hn, 1)

        // Finally, check that the node's topology graph has seen this channel
        // closed if it's a public channel.
        if !resp.Channel.Private {
                h.AssertTopologyChannelClosed(hn, cp)
        }

        // Assert there's a pending anchor sweep.
        if anchorSweep {
                h.AssertNumPendingSweeps(hn, 1)
        }

        return closingTxid
}

// AssertChannelPolicyUpdate checks that the required policy update has
// happened on the given node.
func (h *HarnessTest) AssertChannelPolicyUpdate(hn *node.HarnessNode,
        advertisingNode *node.HarnessNode, policy *lnrpc.RoutingPolicy,
        chanPoint *lnrpc.ChannelPoint, includeUnannounced bool) {

        require.NoError(
                h, hn.Watcher.WaitForChannelPolicyUpdate(
                        advertisingNode, policy,
                        chanPoint, includeUnannounced,
                ), "%s: error while waiting for channel update", hn.Name(),
        )
}

// WaitForGraphSync waits until the node is synced to graph or times out.
func (h *HarnessTest) WaitForGraphSync(hn *node.HarnessNode) {
        err := wait.NoError(func() error {
                resp := hn.RPC.GetInfo()
                if resp.SyncedToGraph {
                        return nil
                }

                return fmt.Errorf("node not synced to graph")
        }, DefaultTimeout)
        require.NoError(h, err, "%s: timeout while sync to graph", hn.Name())
}

// AssertNumUTXOsWithConf waits for the given number of UTXOs with the
// specified confirmations range to be available or fails if that isn't the
// case before the default timeout.
//
// NOTE: for standby nodes(Alice and Bob), this method takes account of the
// previous state of the node's UTXOs. The previous state is snapshotted when
// finishing a previous test case via the cleanup function in `Subtest`. In
// other words, this assertion only checks the new changes made in the current
// test.
func (h *HarnessTest) AssertNumUTXOsWithConf(hn *node.HarnessNode,
        expectedUtxos int, max, min int32) []*lnrpc.Utxo {

        var unconfirmed bool

        old := hn.State.UTXO.Confirmed
        if max == 0 {
                old = hn.State.UTXO.Unconfirmed
                unconfirmed = true
        }

        var utxos []*lnrpc.Utxo
        err := wait.NoError(func() error {
                req := &walletrpc.ListUnspentRequest{
                        Account:         "",
                        MaxConfs:        max,
                        MinConfs:        min,
                        UnconfirmedOnly: unconfirmed,
                }
                resp := hn.RPC.ListUnspent(req)
                total := len(resp.Utxos)

                if total-old == expectedUtxos {
                        utxos = resp.Utxos[old:]

                        return nil
                }

                desc := "has UTXOs:\n"
                for _, utxo := range resp.Utxos {
                        desc += fmt.Sprintf("%v\n", utxo)
                }

                return errNumNotMatched(hn.Name(), "num of UTXOs",
                        expectedUtxos, total-old, total, old, desc)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout waiting for UTXOs")

        return utxos
}

// AssertNumUTXOsUnconfirmed asserts the expected num of unconfirmed utxos are
// seen.
//
// NOTE: for standby nodes(Alice and Bob), this method takes account of the
// previous state of the node's UTXOs. Check `AssertNumUTXOsWithConf` for
// details.
func (h *HarnessTest) AssertNumUTXOsUnconfirmed(hn *node.HarnessNode,
        num int) []*lnrpc.Utxo {

        return h.AssertNumUTXOsWithConf(hn, num, 0, 0)
}

// AssertNumUTXOsConfirmed asserts the expected num of confirmed utxos are
// seen, which means the returned utxos have at least one confirmation.
//
// NOTE: for standby nodes(Alice and Bob), this method takes account of the
// previous state of the node's UTXOs. Check `AssertNumUTXOsWithConf` for
// details.
func (h *HarnessTest) AssertNumUTXOsConfirmed(hn *node.HarnessNode,
        num int) []*lnrpc.Utxo {

        return h.AssertNumUTXOsWithConf(hn, num, math.MaxInt32, 1)
}

// AssertNumUTXOs asserts the expected num of utxos are seen, including
// confirmed and unconfirmed outputs.
//
// NOTE: for standby nodes(Alice and Bob), this method takes account of the
// previous state of the node's UTXOs. Check `AssertNumUTXOsWithConf` for
// details.
func (h *HarnessTest) AssertNumUTXOs(hn *node.HarnessNode,
        num int) []*lnrpc.Utxo {

        return h.AssertNumUTXOsWithConf(hn, num, math.MaxInt32, 0)
}

// getUTXOs gets the number of newly created UTOXs within the current test
// scope.
func (h *HarnessTest) getUTXOs(hn *node.HarnessNode, account string,
        max, min int32) []*lnrpc.Utxo {

        var unconfirmed bool

        if max == 0 {
                unconfirmed = true
        }

        req := &walletrpc.ListUnspentRequest{
                Account:         account,
                MaxConfs:        max,
                MinConfs:        min,
                UnconfirmedOnly: unconfirmed,
        }
        resp := hn.RPC.ListUnspent(req)

        return resp.Utxos
}

// GetUTXOs returns all the UTXOs for the given node's account, including
// confirmed and unconfirmed.
func (h *HarnessTest) GetUTXOs(hn *node.HarnessNode,
        account string) []*lnrpc.Utxo {

        return h.getUTXOs(hn, account, math.MaxInt32, 0)
}

// GetUTXOsConfirmed returns the confirmed UTXOs for the given node's account.
func (h *HarnessTest) GetUTXOsConfirmed(hn *node.HarnessNode,
        account string) []*lnrpc.Utxo {

        return h.getUTXOs(hn, account, math.MaxInt32, 1)
}

// GetUTXOsUnconfirmed returns the unconfirmed UTXOs for the given node's
// account.
func (h *HarnessTest) GetUTXOsUnconfirmed(hn *node.HarnessNode,
        account string) []*lnrpc.Utxo {

        return h.getUTXOs(hn, account, 0, 0)
}

// WaitForBalanceConfirmed waits until the node sees the expected confirmed
// balance in its wallet.
func (h *HarnessTest) WaitForBalanceConfirmed(hn *node.HarnessNode,
        expected btcutil.Amount) {

        var lastBalance btcutil.Amount
        err := wait.NoError(func() error {
                resp := hn.RPC.WalletBalance()

                lastBalance = btcutil.Amount(resp.ConfirmedBalance)
                if lastBalance == expected {
                        return nil
                }

                return fmt.Errorf("expected %v, only have %v", expected,
                        lastBalance)
        }, DefaultTimeout)

        require.NoError(h, err, "timeout waiting for confirmed balances")
}

// WaitForBalanceUnconfirmed waits until the node sees the expected unconfirmed
// balance in its wallet.
func (h *HarnessTest) WaitForBalanceUnconfirmed(hn *node.HarnessNode,
        expected btcutil.Amount) {

        var lastBalance btcutil.Amount
        err := wait.NoError(func() error {
                resp := hn.RPC.WalletBalance()

                lastBalance = btcutil.Amount(resp.UnconfirmedBalance)
                if lastBalance == expected {
                        return nil
                }

                return fmt.Errorf("expected %v, only have %v", expected,
                        lastBalance)
        }, DefaultTimeout)

        require.NoError(h, err, "timeout waiting for unconfirmed balances")
}

// Random32Bytes generates a random 32 bytes which can be used as a pay hash,
// preimage, etc.
func (h *HarnessTest) Random32Bytes() []byte {
        randBuf := make([]byte, lntypes.HashSize)

        _, err := rand.Read(randBuf)
        require.NoErrorf(h, err, "internal error, cannot generate random bytes")

        return randBuf
}

// RandomPreimage generates a random preimage which can be used as a payment
// preimage.
func (h *HarnessTest) RandomPreimage() lntypes.Preimage {
        var preimage lntypes.Preimage
        copy(preimage[:], h.Random32Bytes())

        return preimage
}

// DecodeAddress decodes a given address and asserts there's no error.
func (h *HarnessTest) DecodeAddress(addr string) btcutil.Address {
        resp, err := btcutil.DecodeAddress(addr, miner.HarnessNetParams)
        require.NoError(h, err, "DecodeAddress failed")

        return resp
}

// PayToAddrScript creates a new script from the given address and asserts
// there's no error.
func (h *HarnessTest) PayToAddrScript(addr btcutil.Address) []byte {
        addrScript, err := txscript.PayToAddrScript(addr)
        require.NoError(h, err, "PayToAddrScript failed")

        return addrScript
}

// AssertChannelBalanceResp makes a ChannelBalance request and checks the
// returned response matches the expected.
func (h *HarnessTest) AssertChannelBalanceResp(hn *node.HarnessNode,
        expected *lnrpc.ChannelBalanceResponse) {

        resp := hn.RPC.ChannelBalance()
        require.True(h, proto.Equal(expected, resp), "balance is incorrect "+
                "got: %v, want: %v", resp, expected)
}

// GetChannelByChanPoint tries to find a channel matching the channel point and
// asserts. It returns the channel found.
func (h *HarnessTest) GetChannelByChanPoint(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) *lnrpc.Channel {

        channel, err := h.findChannel(hn, chanPoint)
        require.NoErrorf(h, err, "channel not found using %v", chanPoint)

        return channel
}

// GetChannelCommitType retrieves the active channel commitment type for the
// given chan point.
func (h *HarnessTest) GetChannelCommitType(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) lnrpc.CommitmentType {

        c := h.GetChannelByChanPoint(hn, chanPoint)

        return c.CommitmentType
}

// AssertNumPendingOpenChannels asserts that a given node have the expected
// number of pending open channels.
func (h *HarnessTest) AssertNumPendingOpenChannels(hn *node.HarnessNode,
        expected int) []*lnrpc.PendingChannelsResponse_PendingOpenChannel {

        var channels []*lnrpc.PendingChannelsResponse_PendingOpenChannel

        oldNum := hn.State.OpenChannel.Pending

        err := wait.NoError(func() error {
                resp := hn.RPC.PendingChannels()
                channels = resp.PendingOpenChannels
                total := len(channels)

                numChans := total - oldNum

                if numChans != expected {
                        return errNumNotMatched(hn.Name(),
                                "pending open channels", expected,
                                numChans, total, oldNum)
                }

                return nil
        }, DefaultTimeout)

        require.NoError(h, err, "num of pending open channels not match")

        return channels
}

// AssertNodesNumPendingOpenChannels asserts that both of the nodes have the
// expected number of pending open channels.
func (h *HarnessTest) AssertNodesNumPendingOpenChannels(a, b *node.HarnessNode,
        expected int) {

        h.AssertNumPendingOpenChannels(a, expected)
        h.AssertNumPendingOpenChannels(b, expected)
}

// AssertPaymentStatusFromStream takes a client stream and asserts the payment
// is in desired status before default timeout. The payment found is returned
// once succeeded.
func (h *HarnessTest) AssertPaymentStatusFromStream(stream rpc.PaymentClient,
        status lnrpc.Payment_PaymentStatus) *lnrpc.Payment {

        return h.assertPaymentStatusWithTimeout(
                stream, status, wait.PaymentTimeout,
        )
}

// AssertPaymentSucceedWithTimeout asserts that a payment is succeeded within
// the specified timeout.
func (h *HarnessTest) AssertPaymentSucceedWithTimeout(stream rpc.PaymentClient,
        timeout time.Duration) *lnrpc.Payment {

        return h.assertPaymentStatusWithTimeout(
                stream, lnrpc.Payment_SUCCEEDED, timeout,
        )
}

// assertPaymentStatusWithTimeout takes a client stream and asserts the payment
// is in desired status before the specified timeout. The payment found is
// returned once succeeded.
func (h *HarnessTest) assertPaymentStatusWithTimeout(stream rpc.PaymentClient,
        status lnrpc.Payment_PaymentStatus,
        timeout time.Duration) *lnrpc.Payment {

        var target *lnrpc.Payment
        err := wait.NoError(func() error {
                // Consume one message. This will raise an error if the message
                // is not received within DefaultTimeout.
                payment, err := h.receivePaymentUpdateWithTimeout(
                        stream, timeout,
                )
                if err != nil {
                        return fmt.Errorf("received error from payment "+
                                "stream: %s", err)
                }

                // Return if the desired payment state is reached.
                if payment.Status == status {
                        target = payment

                        return nil
                }

                // Return the err so that it can be used for debugging when
                // timeout is reached.
                return fmt.Errorf("payment %v status, got %v, want %v",
                        payment.PaymentHash, payment.Status, status)
        }, timeout)

        require.NoError(h, err, "timeout while waiting payment")

        return target
}

// ReceivePaymentUpdate waits until a message is received on the payment client
// stream or the timeout is reached.
func (h *HarnessTest) ReceivePaymentUpdate(
        stream rpc.PaymentClient) (*lnrpc.Payment, error) {

        return h.receivePaymentUpdateWithTimeout(stream, DefaultTimeout)
}

// receivePaymentUpdateWithTimeout waits until a message is received on the
// payment client stream or the timeout is reached.
func (h *HarnessTest) receivePaymentUpdateWithTimeout(stream rpc.PaymentClient,
        timeout time.Duration) (*lnrpc.Payment, error) {

        chanMsg := make(chan *lnrpc.Payment, 1)
        errChan := make(chan error, 1)

        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err

                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(timeout):
                require.Fail(h, "timeout", "timeout waiting for payment update")
                return nil, nil

        case err := <-errChan:
                return nil, err

        case updateMsg := <-chanMsg:
                return updateMsg, nil
        }
}

// AssertInvoiceSettled asserts a given invoice specified by its payment
// address is settled.
func (h *HarnessTest) AssertInvoiceSettled(hn *node.HarnessNode, addr []byte) {
        msg := &invoicesrpc.LookupInvoiceMsg{
                InvoiceRef: &invoicesrpc.LookupInvoiceMsg_PaymentAddr{
                        PaymentAddr: addr,
                },
        }

        err := wait.NoError(func() error {
                invoice := hn.RPC.LookupInvoiceV2(msg)
                if invoice.State == lnrpc.Invoice_SETTLED {
                        return nil
                }

                return fmt.Errorf("%s: invoice with payment address %x not "+
                        "settled", hn.Name(), addr)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout waiting for invoice settled state")
}

// AssertNodeNumChannels polls the provided node's list channels rpc until it
// reaches the desired number of total channels.
func (h *HarnessTest) AssertNodeNumChannels(hn *node.HarnessNode,
        numChannels int) {

        // Get the total number of channels.
        old := hn.State.OpenChannel.Active + hn.State.OpenChannel.Inactive

        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                chanInfo := hn.RPC.ListChannels(&lnrpc.ListChannelsRequest{})

                // Return true if the query returned the expected number of
                // channels.
                num := len(chanInfo.Channels) - old
                if num != numChannels {
                        return fmt.Errorf("expected %v channels, got %v",
                                numChannels, num)
                }

                return nil
        }, DefaultTimeout)

        require.NoError(h, err, "timeout checking node's num of channels")
}

// AssertChannelLocalBalance checks the local balance of the given channel is
// expected. The channel found using the specified channel point is returned.
func (h *HarnessTest) AssertChannelLocalBalance(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, balance int64) *lnrpc.Channel {

        var result *lnrpc.Channel

        // Get the funding point.
        err := wait.NoError(func() error {
                // Find the target channel first.
                target, err := h.findChannel(hn, cp)

                // Exit early if the channel is not found.
                if err != nil {
                        return fmt.Errorf("check balance failed: %w", err)
                }

                result = target

                // Check local balance.
                if target.LocalBalance == balance {
                        return nil
                }

                return fmt.Errorf("balance is incorrect, got %v, expected %v",
                        target.LocalBalance, balance)
        }, DefaultTimeout)

        require.NoError(h, err, "timeout while checking for balance")

        return result
}

// AssertChannelNumUpdates checks the num of updates is expected from the given
// channel.
func (h *HarnessTest) AssertChannelNumUpdates(hn *node.HarnessNode,
        num uint64, cp *lnrpc.ChannelPoint) {

        old := int(hn.State.OpenChannel.NumUpdates)

        // Find the target channel first.
        target, err := h.findChannel(hn, cp)
        require.NoError(h, err, "unable to find channel")

        err = wait.NoError(func() error {
                total := int(target.NumUpdates)
                if total-old == int(num) {
                        return nil
                }

                return errNumNotMatched(hn.Name(), "channel updates",
                        int(num), total-old, total, old)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout while checking for num of updates")
}

// AssertNumActiveHtlcs asserts that a given number of HTLCs are seen in the
// node's channels.
func (h *HarnessTest) AssertNumActiveHtlcs(hn *node.HarnessNode, num int) {
        old := hn.State.HTLC

        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                req := &lnrpc.ListChannelsRequest{}
                nodeChans := hn.RPC.ListChannels(req)

                total := 0
                for _, channel := range nodeChans.Channels {
                        total += len(channel.PendingHtlcs)
                }
                if total-old != num {
                        return errNumNotMatched(hn.Name(), "active HTLCs",
                                num, total-old, total, old)
                }

                return nil
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s timeout checking num active htlcs",
                hn.Name())
}

// AssertActiveHtlcs makes sure the node has the _exact_ HTLCs matching
// payHashes on _all_ their channels.
func (h *HarnessTest) AssertActiveHtlcs(hn *node.HarnessNode,
        payHashes ...[]byte) {

        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                req := &lnrpc.ListChannelsRequest{}
                nodeChans := hn.RPC.ListChannels(req)

                for _, ch := range nodeChans.Channels {
                        // Record all payment hashes active for this channel.
                        htlcHashes := make(map[string]struct{})

                        for _, htlc := range ch.PendingHtlcs {
                                h := hex.EncodeToString(htlc.HashLock)
                                _, ok := htlcHashes[h]
                                if ok {
                                        return fmt.Errorf("duplicate HashLock "+
                                                "in PendingHtlcs: %v",
                                                ch.PendingHtlcs)
                                }
                                htlcHashes[h] = struct{}{}
                        }

                        // Channel should have exactly the payHashes active.
                        if len(payHashes) != len(htlcHashes) {
                                return fmt.Errorf("node [%s:%x] had %v "+
                                        "htlcs active, expected %v",
                                        hn.Name(), hn.PubKey[:],
                                        len(htlcHashes), len(payHashes))
                        }

                        // Make sure all the payHashes are active.
                        for _, payHash := range payHashes {
                                h := hex.EncodeToString(payHash)
                                if _, ok := htlcHashes[h]; ok {
                                        continue
                                }

                                return fmt.Errorf("node [%s:%x] didn't have: "+
                                        "the payHash %v active", hn.Name(),
                                        hn.PubKey[:], h)
                        }
                }

                return nil
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking active HTLCs")
}

// AssertIncomingHTLCActive asserts the node has a pending incoming HTLC in the
// given channel. Returns the HTLC if found and active.
func (h *HarnessTest) AssertIncomingHTLCActive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, payHash []byte) *lnrpc.HTLC {

        return h.assertHTLCActive(hn, cp, payHash, true)
}

// AssertOutgoingHTLCActive asserts the node has a pending outgoing HTLC in the
// given channel. Returns the HTLC if found and active.
func (h *HarnessTest) AssertOutgoingHTLCActive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, payHash []byte) *lnrpc.HTLC {

        return h.assertHTLCActive(hn, cp, payHash, false)
}

// assertHLTCActive asserts the node has a pending HTLC in the given channel.
// Returns the HTLC if found and active.
func (h *HarnessTest) assertHTLCActive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, payHash []byte, incoming bool) *lnrpc.HTLC {

        var result *lnrpc.HTLC
        target := hex.EncodeToString(payHash)

        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                ch := h.GetChannelByChanPoint(hn, cp)

                // Check all payment hashes active for this channel.
                for _, htlc := range ch.PendingHtlcs {
                        h := hex.EncodeToString(htlc.HashLock)
                        if h != target {
                                continue
                        }

                        // If the payment hash is found, check the incoming
                        // field.
                        if htlc.Incoming == incoming {
                                // Found it and return.
                                result = htlc
                                return nil
                        }

                        // Otherwise we do have the HTLC but its direction is
                        // not right.
                        have, want := "outgoing", "incoming"
                        if htlc.Incoming {
                                have, want = "incoming", "outgoing"
                        }

                        return fmt.Errorf("node[%s] have htlc(%v), want: %s, "+
                                "have: %s", hn.Name(), payHash, want, have)
                }

                return fmt.Errorf("node [%s:%x] didn't have: the payHash %x",
                        hn.Name(), hn.PubKey[:], payHash)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking pending HTLC")

        return result
}

// AssertHLTCNotActive asserts the node doesn't have a pending HTLC in the
// given channel, which mean either the HTLC never exists, or it was pending
// and now settled. Returns the HTLC if found and active.
//
// NOTE: to check a pending HTLC becoming settled, first use AssertHLTCActive
// then follow this check.
func (h *HarnessTest) AssertHTLCNotActive(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, payHash []byte) *lnrpc.HTLC {

        var result *lnrpc.HTLC
        target := hex.EncodeToString(payHash)

        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                ch := h.GetChannelByChanPoint(hn, cp)

                // Check all payment hashes active for this channel.
                for _, htlc := range ch.PendingHtlcs {
                        h := hex.EncodeToString(htlc.HashLock)

                        // Break if found the htlc.
                        if h == target {
                                result = htlc
                                break
                        }
                }

                // If we've found nothing, we're done.
                if result == nil {
                        return nil
                }

                // Otherwise return an error.
                return fmt.Errorf("node [%s:%x] still has: the payHash %x",
                        hn.Name(), hn.PubKey[:], payHash)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking pending HTLC")

        return result
}

// ReceiveSingleInvoice waits until a message is received on the subscribe
// single invoice stream or the timeout is reached.
func (h *HarnessTest) ReceiveSingleInvoice(
        stream rpc.SingleInvoiceClient) *lnrpc.Invoice {

        chanMsg := make(chan *lnrpc.Invoice, 1)
        errChan := make(chan error, 1)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err

                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout receiving single invoice")

        case err := <-errChan:
                require.Failf(h, "err from stream",
                        "received err from stream: %v", err)

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// AssertInvoiceState takes a single invoice subscription stream and asserts
// that a given invoice has became the desired state before timeout and returns
// the invoice found.
func (h *HarnessTest) AssertInvoiceState(stream rpc.SingleInvoiceClient,
        state lnrpc.Invoice_InvoiceState) *lnrpc.Invoice {

        var invoice *lnrpc.Invoice

        err := wait.NoError(func() error {
                invoice = h.ReceiveSingleInvoice(stream)
                if invoice.State == state {
                        return nil
                }

                return fmt.Errorf("mismatched invoice state, want %v, got %v",
                        state, invoice.State)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout waiting for invoice state: %v", state)

        return invoice
}

// assertAllTxesSpendFrom asserts that all txes in the list spend from the
// given tx.
func (h *HarnessTest) AssertAllTxesSpendFrom(txes []*wire.MsgTx,
        prevTxid chainhash.Hash) {

        for _, tx := range txes {
                if tx.TxIn[0].PreviousOutPoint.Hash != prevTxid {
                        require.Failf(h, "", "tx %v did not spend from %v",
                                tx.TxHash(), prevTxid)
                }
        }
}

// AssertTxSpendFrom asserts that a given tx is spent from a previous tx.
func (h *HarnessTest) AssertTxSpendFrom(tx *wire.MsgTx,
        prevTxid chainhash.Hash) {

        if tx.TxIn[0].PreviousOutPoint.Hash != prevTxid {
                require.Failf(h, "", "tx %v did not spend from %v",
                        tx.TxHash(), prevTxid)
        }
}

type PendingForceClose *lnrpc.PendingChannelsResponse_ForceClosedChannel

// AssertChannelPendingForceClose asserts that the given channel found in the
// node is pending force close. Returns the PendingForceClose if found.
func (h *HarnessTest) AssertChannelPendingForceClose(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint) PendingForceClose {

        var target PendingForceClose

        op := h.OutPointFromChannelPoint(chanPoint)

        err := wait.NoError(func() error {
                resp := hn.RPC.PendingChannels()

                forceCloseChans := resp.PendingForceClosingChannels
                for _, ch := range forceCloseChans {
                        if ch.Channel.ChannelPoint == op.String() {
                                target = ch

                                return nil
                        }
                }

                return fmt.Errorf("%v: channel %s not found in pending "+
                        "force close", hn.Name(), chanPoint)
        }, DefaultTimeout)
        require.NoError(h, err, "assert pending force close timed out")

        return target
}

// AssertNumHTLCsAndStage takes a pending force close channel's channel point
// and asserts the expected number of pending HTLCs and HTLC stage are matched.
func (h *HarnessTest) AssertNumHTLCsAndStage(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint, num int, stage uint32) {

        // Get the channel output point.
        cp := h.OutPointFromChannelPoint(chanPoint)

        var target PendingForceClose
        checkStage := func() error {
                resp := hn.RPC.PendingChannels()
                if len(resp.PendingForceClosingChannels) == 0 {
                        return fmt.Errorf("zero pending force closing channels")
                }

                for _, ch := range resp.PendingForceClosingChannels {
                        if ch.Channel.ChannelPoint == cp.String() {
                                target = ch

                                break
                        }
                }

                if target == nil {
                        return fmt.Errorf("cannot find pending force closing "+
                                "channel using %v", cp)
                }

                if target.LimboBalance == 0 {
                        return fmt.Errorf("zero limbo balance")
                }

                if len(target.PendingHtlcs) != num {
                        return fmt.Errorf("got %d pending htlcs, want %d",
                                len(target.PendingHtlcs), num)
                }

                for i, htlc := range target.PendingHtlcs {
                        if htlc.Stage == stage {
                                continue
                        }

                        return fmt.Errorf("HTLC %d got stage: %v, "+
                                "want stage: %v", i, htlc.Stage, stage)
                }

                return nil
        }

        require.NoErrorf(h, wait.NoError(checkStage, DefaultTimeout),
                "timeout waiting for htlc stage")
}

// findPayment queries the payment from the node's ListPayments which matches
// the specified preimage hash.
func (h *HarnessTest) findPayment(hn *node.HarnessNode,
        paymentHash string) *lnrpc.Payment {

        req := &lnrpc.ListPaymentsRequest{IncludeIncomplete: true}
        paymentsResp := hn.RPC.ListPayments(req)

        for _, p := range paymentsResp.Payments {
                if p.PaymentHash != paymentHash {
                        continue
                }

                return p
        }

        require.Failf(h, "payment not found", "payment %v cannot be found",
                paymentHash)

        return nil
}

// AssertPaymentStatus asserts that the given node list a payment with the
// given preimage has the expected status. It also checks that the payment has
// the expected preimage, which is empty when it's not settled and matches the
// given preimage when it's succeeded.
func (h *HarnessTest) AssertPaymentStatus(hn *node.HarnessNode,
        preimage lntypes.Preimage,
        status lnrpc.Payment_PaymentStatus) *lnrpc.Payment {

        var target *lnrpc.Payment
        payHash := preimage.Hash()

        err := wait.NoError(func() error {
                p := h.findPayment(hn, payHash.String())
                if status == p.Status {
                        target = p
                        return nil
                }

                return fmt.Errorf("payment: %v status not match, want %s "+
                        "got %s", payHash, status, p.Status)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking payment status")

        switch status {
        // If this expected status is SUCCEEDED, we expect the final
        // preimage.
        case lnrpc.Payment_SUCCEEDED:
                require.Equal(h, preimage.String(), target.PaymentPreimage,
                        "preimage not match")

        // Otherwise we expect an all-zero preimage.
        default:
                require.Equal(h, (lntypes.Preimage{}).String(),
                        target.PaymentPreimage, "expected zero preimage")
        }

        return target
}

// AssertPaymentFailureReason asserts that the given node lists a payment with
// the given preimage which has the expected failure reason.
func (h *HarnessTest) AssertPaymentFailureReason(hn *node.HarnessNode,
        preimage lntypes.Preimage, reason lnrpc.PaymentFailureReason) {

        payHash := preimage.Hash()
        err := wait.NoError(func() error {
                p := h.findPayment(hn, payHash.String())
                if reason == p.FailureReason {
                        return nil
                }

                return fmt.Errorf("payment: %v failure reason not match, "+
                        "want %s got %s", payHash, reason, p.Status)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking payment failure reason")
}

// AssertActiveNodesSynced asserts all active nodes have synced to the chain.
func (h *HarnessTest) AssertActiveNodesSynced() {
        for _, node := range h.manager.activeNodes {
                h.WaitForBlockchainSync(node)
        }
}

// AssertActiveNodesSyncedTo asserts all active nodes have synced to the
// provided bestBlock.
func (h *HarnessTest) AssertActiveNodesSyncedTo(bestBlock *wire.MsgBlock) {
        for _, node := range h.manager.activeNodes {
                h.WaitForBlockchainSyncTo(node, bestBlock)
        }
}

// AssertPeerNotConnected asserts that the given node b is not connected to a.
func (h *HarnessTest) AssertPeerNotConnected(a, b *node.HarnessNode) {
        err := wait.NoError(func() error {
                // We require the RPC call to be succeeded and won't wait for
                // it as it's an unexpected behavior.
                resp := a.RPC.ListPeers()

                // If node B is seen in the ListPeers response from node A,
                // then we return false as the connection has been fully
                // established.
                for _, peer := range resp.Peers {
                        if peer.PubKey == b.PubKeyStr {
                                return fmt.Errorf("peers %s and %s still "+
                                        "connected", a.Name(), b.Name())
                        }
                }

                return nil
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking peers not connected")
}

// AssertNotConnected asserts that two peers are not connected.
func (h *HarnessTest) AssertNotConnected(a, b *node.HarnessNode) {
        h.AssertPeerNotConnected(a, b)
        h.AssertPeerNotConnected(b, a)
}

// AssertConnected asserts that two peers are connected.
func (h *HarnessTest) AssertConnected(a, b *node.HarnessNode) {
        h.AssertPeerConnected(a, b)
        h.AssertPeerConnected(b, a)
}

// AssertAmountPaid checks that the ListChannels command of the provided
// node list the total amount sent and received as expected for the
// provided channel.
func (h *HarnessTest) AssertAmountPaid(channelName string, hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint, amountSent, amountReceived int64) {

        checkAmountPaid := func() error {
                // Find the targeted channel.
                channel, err := h.findChannel(hn, chanPoint)
                if err != nil {
                        return fmt.Errorf("assert amount failed: %w", err)
                }

                if channel.TotalSatoshisSent != amountSent {
                        return fmt.Errorf("%v: incorrect amount"+
                                " sent: %v != %v", channelName,
                                channel.TotalSatoshisSent,
                                amountSent)
                }
                if channel.TotalSatoshisReceived !=
                        amountReceived {

                        return fmt.Errorf("%v: incorrect amount"+
                                " received: %v != %v",
                                channelName,
                                channel.TotalSatoshisReceived,
                                amountReceived)
                }

                return nil
        }

        // As far as HTLC inclusion in commitment transaction might be
        // postponed we will try to check the balance couple of times,
        // and then if after some period of time we receive wrong
        // balance return the error.
        err := wait.NoError(checkAmountPaid, DefaultTimeout)
        require.NoError(h, err, "timeout while checking amount paid")
}

// AssertLastHTLCError checks that the last sent HTLC of the last payment sent
// by the given node failed with the expected failure code.
func (h *HarnessTest) AssertLastHTLCError(hn *node.HarnessNode,
        code lnrpc.Failure_FailureCode) {

        // Use -1 to specify the last HTLC.
        h.assertHTLCError(hn, code, -1)
}

// AssertFirstHTLCError checks that the first HTLC of the last payment sent
// by the given node failed with the expected failure code.
func (h *HarnessTest) AssertFirstHTLCError(hn *node.HarnessNode,
        code lnrpc.Failure_FailureCode) {

        // Use 0 to specify the first HTLC.
        h.assertHTLCError(hn, code, 0)
}

// assertLastHTLCError checks that the HTLC at the specified index of the last
// payment sent by the given node failed with the expected failure code.
func (h *HarnessTest) assertHTLCError(hn *node.HarnessNode,
        code lnrpc.Failure_FailureCode, index int) {

        req := &lnrpc.ListPaymentsRequest{
                IncludeIncomplete: true,
        }

        err := wait.NoError(func() error {
                paymentsResp := hn.RPC.ListPayments(req)

                payments := paymentsResp.Payments
                if len(payments) == 0 {
                        return fmt.Errorf("no payments found")
                }

                payment := payments[len(payments)-1]
                htlcs := payment.Htlcs
                if len(htlcs) == 0 {
                        return fmt.Errorf("no htlcs found")
                }

                // If the index is greater than 0, check we have enough htlcs.
                if index > 0 && len(htlcs) <= index {
                        return fmt.Errorf("not enough htlcs")
                }

                // If index is less than or equal to 0, we will read the last
                // htlc.
                if index <= 0 {
                        index = len(htlcs) - 1
                }

                htlc := htlcs[index]

                // The htlc must have a status of failed.
                if htlc.Status != lnrpc.HTLCAttempt_FAILED {
                        return fmt.Errorf("htlc should be failed")
                }
                // The failure field must not be empty.
                if htlc.Failure == nil {
                        return fmt.Errorf("expected htlc failure")
                }

                // Exit if the expected code is found.
                if htlc.Failure.Code == code {
                        return nil
                }

                return fmt.Errorf("unexpected failure code")
        }, DefaultTimeout)

        require.NoError(h, err, "timeout checking HTLC error")
}

// AssertZombieChannel asserts that a given channel found using the chanID is
// marked as zombie.
func (h *HarnessTest) AssertZombieChannel(hn *node.HarnessNode, chanID uint64) {
        ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
        defer cancel()

        err := wait.NoError(func() error {
                _, err := hn.RPC.LN.GetChanInfo(
                        ctxt, &lnrpc.ChanInfoRequest{ChanId: chanID},
                )
                if err == nil {
                        return fmt.Errorf("expected error but got nil")
                }

                if !strings.Contains(err.Error(), "marked as zombie") {
                        return fmt.Errorf("expected error to contain '%s' but "+
                                "was '%v'", "marked as zombie", err)
                }

                return nil
        }, DefaultTimeout)
        require.NoError(h, err, "timeout while checking zombie channel")
}

// AssertNotInGraph asserts that a given channel is either not found at all in
// the graph or that it has been marked as a zombie.
func (h *HarnessTest) AssertNotInGraph(hn *node.HarnessNode, chanID uint64) {
        ctxt, cancel := context.WithTimeout(h.runCtx, DefaultTimeout)
        defer cancel()

        err := wait.NoError(func() error {
                _, err := hn.RPC.LN.GetChanInfo(
                        ctxt, &lnrpc.ChanInfoRequest{ChanId: chanID},
                )
                if err == nil {
                        return fmt.Errorf("expected error but got nil")
                }

                switch {
                case strings.Contains(err.Error(), "marked as zombie"):
                        return nil

                case strings.Contains(err.Error(), "edge not found"):
                        return nil

                default:
                        return fmt.Errorf("expected error to contain either "+
                                "'%s' or '%s' but was: '%v'", "marked as i"+
                                "zombie", "edge not found", err)
                }
        }, DefaultTimeout)
        require.NoError(h, err, "timeout while checking that channel is not "+
                "found in graph")
}

// AssertTxAtHeight gets all of the transactions that a node's wallet has a
// record of at the target height, and finds and returns the tx with the target
// txid, failing if it is not found.
func (h *HarnessTest) AssertTxAtHeight(hn *node.HarnessNode, height int32,
        txid *chainhash.Hash) *lnrpc.Transaction {

        req := &lnrpc.GetTransactionsRequest{
                StartHeight: height,
                EndHeight:   height,
        }
        txns := hn.RPC.GetTransactions(req)

        for _, tx := range txns.Transactions {
                if tx.TxHash == txid.String() {
                        return tx
                }
        }

        require.Failf(h, "fail to find tx", "tx:%v not found at height:%v",
                txid, height)

        return nil
}

// getChannelPolicies queries the channel graph and retrieves the current edge
// policies for the provided channel point.
func (h *HarnessTest) getChannelPolicies(hn *node.HarnessNode,
        advertisingNode string,
        cp *lnrpc.ChannelPoint) (*lnrpc.RoutingPolicy, error) {

        req := &lnrpc.ChannelGraphRequest{IncludeUnannounced: true}
        chanGraph := hn.RPC.DescribeGraph(req)

        cpStr := channelPointStr(cp)
        for _, e := range chanGraph.Edges {
                if e.ChanPoint != cpStr {
                        continue
                }

                if e.Node1Pub == advertisingNode {
                        return e.Node1Policy, nil
                }

                return e.Node2Policy, nil
        }

        // If we've iterated over all the known edges and we weren't
        // able to find this specific one, then we'll fail.
        return nil, fmt.Errorf("did not find edge with advertisingNode: %s"+
                ", channel point: %s", advertisingNode, cpStr)
}

// AssertChannelPolicy asserts that the passed node's known channel policy for
// the passed chanPoint is consistent with the expected policy values.
func (h *HarnessTest) AssertChannelPolicy(hn *node.HarnessNode,
        advertisingNode string, expectedPolicy *lnrpc.RoutingPolicy,
        chanPoint *lnrpc.ChannelPoint) {

        policy, err := h.getChannelPolicies(hn, advertisingNode, chanPoint)
        require.NoErrorf(h, err, "%s: failed to find policy", hn.Name())

        err = node.CheckChannelPolicy(policy, expectedPolicy)
        require.NoErrorf(h, err, "%s: check policy failed", hn.Name())
}

// AssertNumPolicyUpdates asserts that a given number of channel policy updates
// has been seen in the specified node.
func (h *HarnessTest) AssertNumPolicyUpdates(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint,
        advertisingNode *node.HarnessNode, num int) {

        op := h.OutPointFromChannelPoint(chanPoint)

        var policies []*node.PolicyUpdateInfo

        err := wait.NoError(func() error {
                policyMap := hn.Watcher.GetPolicyUpdates(op)
                nodePolicy, ok := policyMap[advertisingNode.PubKeyStr]
                if ok {
                        policies = nodePolicy
                }

                if len(policies) == num {
                        return nil
                }

                p, err := json.MarshalIndent(policies, "", "\t")
                require.NoError(h, err, "encode policy err")

                return fmt.Errorf("expected to find %d policy updates, "+
                        "instead got: %d, chanPoint: %v, "+
                        "advertisingNode: %s:%s, policy: %s", num,
                        len(policies), op, advertisingNode.Name(),
                        advertisingNode.PubKeyStr, p)
        }, DefaultTimeout)

        require.NoError(h, err, "%s: timeout waiting for num of policy updates",
                hn.Name())
}

// AssertNumPayments asserts that the number of payments made within the test
// scope is as expected, including the incomplete ones.
func (h *HarnessTest) AssertNumPayments(hn *node.HarnessNode,
        num int) []*lnrpc.Payment {

        // Get the number of payments we already have from the previous test.
        have := hn.State.Payment.Total

        req := &lnrpc.ListPaymentsRequest{
                IncludeIncomplete: true,
                IndexOffset:       hn.State.Payment.LastIndexOffset,
        }

        var payments []*lnrpc.Payment
        err := wait.NoError(func() error {
                resp := hn.RPC.ListPayments(req)

                payments = resp.Payments
                if len(payments) == num {
                        return nil
                }

                return errNumNotMatched(hn.Name(), "num of payments",
                        num, len(payments), have+len(payments), have)
        }, DefaultTimeout)
        require.NoError(h, err, "%s: timeout checking num of payments",
                hn.Name())

        return payments
}

// AssertNumNodeAnns asserts that a given number of node announcements has been
// seen in the specified node.
func (h *HarnessTest) AssertNumNodeAnns(hn *node.HarnessNode,
        pubkey string, num int) []*lnrpc.NodeUpdate {

        // We will get the current number of channel updates first and add it
        // to our expected number of newly created channel updates.
        anns, err := hn.Watcher.WaitForNumNodeUpdates(pubkey, num)
        require.NoError(h, err, "%s: failed to assert num of node anns",
                hn.Name())

        return anns
}

// AssertNumChannelUpdates asserts that a given number of channel updates has
// been seen in the specified node's network topology.
func (h *HarnessTest) AssertNumChannelUpdates(hn *node.HarnessNode,
        chanPoint *lnrpc.ChannelPoint, num int) {

        op := h.OutPointFromChannelPoint(chanPoint)
        err := hn.Watcher.WaitForNumChannelUpdates(op, num)
        require.NoError(h, err, "%s: failed to assert num of channel updates",
                hn.Name())
}

// CreateBurnAddr creates a random burn address of the given type.
func (h *HarnessTest) CreateBurnAddr(addrType lnrpc.AddressType) ([]byte,
        btcutil.Address) {

        randomPrivKey, err := btcec.NewPrivateKey()
        require.NoError(h, err)

        randomKeyBytes := randomPrivKey.PubKey().SerializeCompressed()
        harnessNetParams := miner.HarnessNetParams

        var addr btcutil.Address
        switch addrType {
        case lnrpc.AddressType_WITNESS_PUBKEY_HASH:
                addr, err = btcutil.NewAddressWitnessPubKeyHash(
                        btcutil.Hash160(randomKeyBytes), harnessNetParams,
                )

        case lnrpc.AddressType_TAPROOT_PUBKEY:
                taprootKey := txscript.ComputeTaprootKeyNoScript(
                        randomPrivKey.PubKey(),
                )
                addr, err = btcutil.NewAddressPubKey(
                        schnorr.SerializePubKey(taprootKey), harnessNetParams,
                )

        case lnrpc.AddressType_NESTED_PUBKEY_HASH:
                var witnessAddr btcutil.Address
                witnessAddr, err = btcutil.NewAddressWitnessPubKeyHash(
                        btcutil.Hash160(randomKeyBytes), harnessNetParams,
                )
                require.NoError(h, err)

                addr, err = btcutil.NewAddressScriptHash(
                        h.PayToAddrScript(witnessAddr), harnessNetParams,
                )

        default:
                h.Fatalf("Unsupported burn address type: %v", addrType)
        }
        require.NoError(h, err)

        return h.PayToAddrScript(addr), addr
}

// ReceiveTrackPayment waits until a message is received on the track payment
// stream or the timeout is reached.
func (h *HarnessTest) ReceiveTrackPayment(
        stream rpc.TrackPaymentClient) *lnrpc.Payment {

        chanMsg := make(chan *lnrpc.Payment)
        errChan := make(chan error)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err
                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout trakcing payment")

        case err := <-errChan:
                require.Failf(h, "err from stream",
                        "received err from stream: %v", err)

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// ReceiveHtlcEvent waits until a message is received on the subscribe
// htlc event stream or the timeout is reached.
func (h *HarnessTest) ReceiveHtlcEvent(
        stream rpc.HtlcEventsClient) *routerrpc.HtlcEvent {

        chanMsg := make(chan *routerrpc.HtlcEvent)
        errChan := make(chan error)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err
                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout receiving htlc "+
                        "event update")

        case err := <-errChan:
                require.Failf(h, "err from stream",
                        "received err from stream: %v", err)

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// AssertHtlcEventType consumes one event from a client and asserts the event
// type is matched.
func (h *HarnessTest) AssertHtlcEventType(client rpc.HtlcEventsClient,
        userType routerrpc.HtlcEvent_EventType) *routerrpc.HtlcEvent {

        event := h.ReceiveHtlcEvent(client)
        require.Equalf(h, userType, event.EventType, "wrong event type, "+
                "want %v got %v", userType, event.EventType)

        return event
}

// HtlcEvent maps the series of event types used in `*routerrpc.HtlcEvent_*`.
type HtlcEvent int

const (
        HtlcEventForward HtlcEvent = iota
        HtlcEventForwardFail
        HtlcEventSettle
        HtlcEventLinkFail
        HtlcEventFinal
)

// AssertHtlcEventType consumes one event from a client and asserts both the
// user event type the event.Event type is matched.
func (h *HarnessTest) AssertHtlcEventTypes(client rpc.HtlcEventsClient,
        userType routerrpc.HtlcEvent_EventType,
        eventType HtlcEvent) *routerrpc.HtlcEvent {

        event := h.ReceiveHtlcEvent(client)
        require.Equalf(h, userType, event.EventType, "wrong event type, "+
                "want %v got %v", userType, event.EventType)

        var ok bool

        switch eventType {
        case HtlcEventForward:
                _, ok = event.Event.(*routerrpc.HtlcEvent_ForwardEvent)

        case HtlcEventForwardFail:
                _, ok = event.Event.(*routerrpc.HtlcEvent_ForwardFailEvent)

        case HtlcEventSettle:
                _, ok = event.Event.(*routerrpc.HtlcEvent_SettleEvent)

        case HtlcEventLinkFail:
                _, ok = event.Event.(*routerrpc.HtlcEvent_LinkFailEvent)

        case HtlcEventFinal:
                _, ok = event.Event.(*routerrpc.HtlcEvent_FinalHtlcEvent)
        }

        require.Truef(h, ok, "wrong event type: %T, want %T", event.Event,
                eventType)

        return event
}

// AssertFeeReport checks that the fee report from the given node has the
// desired day, week, and month sum values.
func (h *HarnessTest) AssertFeeReport(hn *node.HarnessNode,
        day, week, month int) {

        err := wait.NoError(func() error {
                feeReport, err := hn.RPC.LN.FeeReport(
                        h.runCtx, &lnrpc.FeeReportRequest{},
                )
                require.NoError(h, err, "unable to query for fee report")

                if uint64(day) != feeReport.DayFeeSum {
                        return fmt.Errorf("day fee mismatch, want %d, got %d",
                                day, feeReport.DayFeeSum)
                }

                if uint64(week) != feeReport.WeekFeeSum {
                        return fmt.Errorf("week fee mismatch, want %d, got %d",
                                week, feeReport.WeekFeeSum)
                }
                if uint64(month) != feeReport.MonthFeeSum {
                        return fmt.Errorf("month fee mismatch, want %d, got %d",
                                month, feeReport.MonthFeeSum)
                }

                return nil
        }, wait.DefaultTimeout)
        require.NoErrorf(h, err, "%s: time out checking fee report", hn.Name())
}

// AssertHtlcEvents consumes events from a client and ensures that they are of
// the expected type and contain the expected number of forwards, forward
// failures and settles.
//
// TODO(yy): needs refactor to reduce its complexity.
func (h *HarnessTest) AssertHtlcEvents(client rpc.HtlcEventsClient,
        fwdCount, fwdFailCount, settleCount, linkFailCount int,
        userType routerrpc.HtlcEvent_EventType) []*routerrpc.HtlcEvent {

        var forwards, forwardFails, settles, linkFails int

        numEvents := fwdCount + fwdFailCount + settleCount + linkFailCount
        events := make([]*routerrpc.HtlcEvent, 0)

        // It's either the userType or the unknown type.
        //
        // TODO(yy): maybe the FinalHtlcEvent shouldn't be in UNKNOWN type?
        eventTypes := []routerrpc.HtlcEvent_EventType{
                userType, routerrpc.HtlcEvent_UNKNOWN,
        }

        for i := 0; i < numEvents; i++ {
                event := h.ReceiveHtlcEvent(client)

                require.Containsf(h, eventTypes, event.EventType,
                        "wrong event type, got %v", userType, event.EventType)

                events = append(events, event)

                switch e := event.Event.(type) {
                case *routerrpc.HtlcEvent_ForwardEvent:
                        forwards++

                case *routerrpc.HtlcEvent_ForwardFailEvent:
                        forwardFails++

                case *routerrpc.HtlcEvent_SettleEvent:
                        settles++

                case *routerrpc.HtlcEvent_FinalHtlcEvent:
                        if e.FinalHtlcEvent.Settled {
                                settles++
                        }

                case *routerrpc.HtlcEvent_LinkFailEvent:
                        linkFails++

                default:
                        require.Fail(h, "assert event fail",
                                "unexpected event: %T", event.Event)
                }
        }

        require.Equal(h, fwdCount, forwards, "num of forwards mismatch")
        require.Equal(h, fwdFailCount, forwardFails,
                "num of forward fails mismatch")
        require.Equal(h, settleCount, settles, "num of settles mismatch")
        require.Equal(h, linkFailCount, linkFails, "num of link fails mismatch")

        return events
}

// AssertTransactionInWallet asserts a given txid can be found in the node's
// wallet.
func (h *HarnessTest) AssertTransactionInWallet(hn *node.HarnessNode,
        txid chainhash.Hash) {

        req := &lnrpc.GetTransactionsRequest{}
        err := wait.NoError(func() error {
                txResp := hn.RPC.GetTransactions(req)
                for _, txn := range txResp.Transactions {
                        if txn.TxHash == txid.String() {
                                return nil
                        }
                }

                return fmt.Errorf("%s: expected txid=%v not found in wallet",
                        hn.Name(), txid)
        }, DefaultTimeout)

        require.NoError(h, err, "failed to find tx")
}

// AssertTransactionNotInWallet asserts a given txid can NOT be found in the
// node's wallet.
func (h *HarnessTest) AssertTransactionNotInWallet(hn *node.HarnessNode,
        txid chainhash.Hash) {

        req := &lnrpc.GetTransactionsRequest{}
        err := wait.NoError(func() error {
                txResp := hn.RPC.GetTransactions(req)
                for _, txn := range txResp.Transactions {
                        if txn.TxHash == txid.String() {
                                return fmt.Errorf("expected txid=%v to be "+
                                        "not found", txid)
                        }
                }

                return nil
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: failed to assert tx not found", hn.Name())
}

// WaitForNodeBlockHeight queries the node for its current block height until
// it reaches the passed height.
func (h *HarnessTest) WaitForNodeBlockHeight(hn *node.HarnessNode,
        height int32) {

        err := wait.NoError(func() error {
                info := hn.RPC.GetInfo()
                if int32(info.BlockHeight) != height {
                        return fmt.Errorf("expected block height to "+
                                "be %v, was %v", height, info.BlockHeight)
                }

                return nil
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: timeout while waiting for height",
                hn.Name())
}

// AssertChannelCommitHeight asserts the given channel for the node has the
// expected commit height(`NumUpdates`).
func (h *HarnessTest) AssertChannelCommitHeight(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, height int) {

        err := wait.NoError(func() error {
                c, err := h.findChannel(hn, cp)
                if err != nil {
                        return err
                }

                if int(c.NumUpdates) == height {
                        return nil
                }

                return fmt.Errorf("expected commit height to be %v, was %v",
                        height, c.NumUpdates)
        }, DefaultTimeout)

        require.NoError(h, err, "timeout while waiting for commit height")
}

// AssertNumInvoices asserts that the number of invoices made within the test
// scope is as expected.
func (h *HarnessTest) AssertNumInvoices(hn *node.HarnessNode,
        num int) []*lnrpc.Invoice {

        have := hn.State.Invoice.Total
        req := &lnrpc.ListInvoiceRequest{
                NumMaxInvoices: math.MaxUint64,
                IndexOffset:    hn.State.Invoice.LastIndexOffset,
        }

        var invoices []*lnrpc.Invoice
        err := wait.NoError(func() error {
                resp := hn.RPC.ListInvoices(req)

                invoices = resp.Invoices
                if len(invoices) == num {
                        return nil
                }

                return errNumNotMatched(hn.Name(), "num of invoices",
                        num, len(invoices), have+len(invoices), have)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking num of invoices")

        return invoices
}

// ReceiveSendToRouteUpdate waits until a message is received on the
// SendToRoute client stream or the timeout is reached.
func (h *HarnessTest) ReceiveSendToRouteUpdate(
        stream rpc.SendToRouteClient) (*lnrpc.SendResponse, error) {

        chanMsg := make(chan *lnrpc.SendResponse, 1)
        errChan := make(chan error, 1)
        go func() {
                // Consume one message. This will block until the message is
                // received.
                resp, err := stream.Recv()
                if err != nil {
                        errChan <- err

                        return
                }
                chanMsg <- resp
        }()

        select {
        case <-time.After(DefaultTimeout):
                require.Fail(h, "timeout", "timeout waiting for send resp")
                return nil, nil

        case err := <-errChan:
                return nil, err

        case updateMsg := <-chanMsg:
                return updateMsg, nil
        }
}

// AssertInvoiceEqual asserts that two lnrpc.Invoices are equivalent. A custom
// comparison function is defined for these tests, since proto message returned
// from unary and streaming RPCs (as of protobuf 1.23.0 and grpc 1.29.1) aren't
// consistent with the private fields set on the messages. As a result, we
// avoid using require.Equal and test only the actual data members.
func (h *HarnessTest) AssertInvoiceEqual(a, b *lnrpc.Invoice) {
        // Ensure the HTLCs are sorted properly before attempting to compare.
        sort.Slice(a.Htlcs, func(i, j int) bool {
                return a.Htlcs[i].ChanId < a.Htlcs[j].ChanId
        })
        sort.Slice(b.Htlcs, func(i, j int) bool {
                return b.Htlcs[i].ChanId < b.Htlcs[j].ChanId
        })

        require.Equal(h, a.Memo, b.Memo)
        require.Equal(h, a.RPreimage, b.RPreimage)
        require.Equal(h, a.RHash, b.RHash)
        require.Equal(h, a.Value, b.Value)
        require.Equal(h, a.ValueMsat, b.ValueMsat)
        require.Equal(h, a.CreationDate, b.CreationDate)
        require.Equal(h, a.SettleDate, b.SettleDate)
        require.Equal(h, a.PaymentRequest, b.PaymentRequest)
        require.Equal(h, a.DescriptionHash, b.DescriptionHash)
        require.Equal(h, a.Expiry, b.Expiry)
        require.Equal(h, a.FallbackAddr, b.FallbackAddr)
        require.Equal(h, a.CltvExpiry, b.CltvExpiry)
        require.Equal(h, a.RouteHints, b.RouteHints)
        require.Equal(h, a.Private, b.Private)
        require.Equal(h, a.AddIndex, b.AddIndex)
        require.Equal(h, a.SettleIndex, b.SettleIndex)
        require.Equal(h, a.AmtPaidSat, b.AmtPaidSat)
        require.Equal(h, a.AmtPaidMsat, b.AmtPaidMsat)
        require.Equal(h, a.State, b.State)
        require.Equal(h, a.Features, b.Features)
        require.Equal(h, a.IsKeysend, b.IsKeysend)
        require.Equal(h, a.PaymentAddr, b.PaymentAddr)
        require.Equal(h, a.IsAmp, b.IsAmp)

        require.Equal(h, len(a.Htlcs), len(b.Htlcs))
        for i := range a.Htlcs {
                htlcA, htlcB := a.Htlcs[i], b.Htlcs[i]
                require.Equal(h, htlcA.ChanId, htlcB.ChanId)
                require.Equal(h, htlcA.HtlcIndex, htlcB.HtlcIndex)
                require.Equal(h, htlcA.AmtMsat, htlcB.AmtMsat)
                require.Equal(h, htlcA.AcceptHeight, htlcB.AcceptHeight)
                require.Equal(h, htlcA.AcceptTime, htlcB.AcceptTime)
                require.Equal(h, htlcA.ResolveTime, htlcB.ResolveTime)
                require.Equal(h, htlcA.ExpiryHeight, htlcB.ExpiryHeight)
                require.Equal(h, htlcA.State, htlcB.State)
                require.Equal(h, htlcA.CustomRecords, htlcB.CustomRecords)
                require.Equal(h, htlcA.MppTotalAmtMsat, htlcB.MppTotalAmtMsat)
                require.Equal(h, htlcA.Amp, htlcB.Amp)
        }
}

// AssertUTXOInWallet asserts that a given UTXO can be found in the node's
// wallet.
func (h *HarnessTest) AssertUTXOInWallet(hn *node.HarnessNode,
        op *lnrpc.OutPoint, account string) {

        err := wait.NoError(func() error {
                utxos := h.GetUTXOs(hn, account)

                err := fmt.Errorf("tx with hash %x not found", op.TxidBytes)
                for _, utxo := range utxos {
                        if !bytes.Equal(utxo.Outpoint.TxidBytes, op.TxidBytes) {
                                continue
                        }

                        err = fmt.Errorf("tx with output index %v not found",
                                op.OutputIndex)
                        if utxo.Outpoint.OutputIndex != op.OutputIndex {
                                continue
                        }

                        return nil
                }

                return err
        }, DefaultTimeout)

        require.NoErrorf(h, err, "outpoint %v not found in %s's wallet",
                op, hn.Name())
}

// AssertWalletAccountBalance asserts that the unconfirmed and confirmed
// balance for the given account is satisfied by the WalletBalance and
// ListUnspent RPCs. The unconfirmed balance is not checked for neutrino nodes.
func (h *HarnessTest) AssertWalletAccountBalance(hn *node.HarnessNode,
        account string, confirmedBalance, unconfirmedBalance int64) {

        err := wait.NoError(func() error {
                balanceResp := hn.RPC.WalletBalance()
                require.Contains(h, balanceResp.AccountBalance, account)
                accountBalance := balanceResp.AccountBalance[account]

                // Check confirmed balance.
                if accountBalance.ConfirmedBalance != confirmedBalance {
                        return fmt.Errorf("expected confirmed balance %v, "+
                                "got %v", confirmedBalance,
                                accountBalance.ConfirmedBalance)
                }

                utxos := h.GetUTXOsConfirmed(hn, account)
                var totalConfirmedVal int64
                for _, utxo := range utxos {
                        totalConfirmedVal += utxo.AmountSat
                }
                if totalConfirmedVal != confirmedBalance {
                        return fmt.Errorf("expected total confirmed utxo "+
                                "balance %v, got %v", confirmedBalance,
                                totalConfirmedVal)
                }

                // Skip unconfirmed balance checks for neutrino nodes.
                if h.IsNeutrinoBackend() {
                        return nil
                }

                // Check unconfirmed balance.
                if accountBalance.UnconfirmedBalance != unconfirmedBalance {
                        return fmt.Errorf("expected unconfirmed balance %v, "+
                                "got %v", unconfirmedBalance,
                                accountBalance.UnconfirmedBalance)
                }

                utxos = h.GetUTXOsUnconfirmed(hn, account)
                var totalUnconfirmedVal int64
                for _, utxo := range utxos {
                        totalUnconfirmedVal += utxo.AmountSat
                }
                if totalUnconfirmedVal != unconfirmedBalance {
                        return fmt.Errorf("expected total unconfirmed utxo "+
                                "balance %v, got %v", unconfirmedBalance,
                                totalUnconfirmedVal)
                }

                return nil
        }, DefaultTimeout)
        require.NoError(h, err, "timeout checking wallet account balance")
}

// AssertClosingTxInMempool assert that the closing transaction of the given
// channel point can be found in the mempool. If the channel has anchors, it
// will assert the anchor sweep tx is also in the mempool.
func (h *HarnessTest) AssertClosingTxInMempool(cp *lnrpc.ChannelPoint,
        c lnrpc.CommitmentType) *wire.MsgTx {

        // Get expected number of txes to be found in the mempool.
        expectedTxes := 1
        hasAnchors := CommitTypeHasAnchors(c)
        if hasAnchors {
                expectedTxes = 2
        }

        // Wait for the expected txes to be found in the mempool.
        h.AssertNumTxsInMempool(expectedTxes)

        // Get the closing tx from the mempool.
        op := h.OutPointFromChannelPoint(cp)
        closeTx := h.AssertOutpointInMempool(op)

        return closeTx
}

// AssertClosingTxInMempool assert that the closing transaction of the given
// channel point can be found in the mempool. If the channel has anchors, it
// will assert the anchor sweep tx is also in the mempool.
func (h *HarnessTest) MineClosingTx(cp *lnrpc.ChannelPoint) *wire.MsgTx {
        // Wait for the expected txes to be found in the mempool.
        h.AssertNumTxsInMempool(1)

        // Get the closing tx from the mempool.
        op := h.OutPointFromChannelPoint(cp)
        closeTx := h.AssertOutpointInMempool(op)

        // Mine a block to confirm the closing transaction and potential anchor
        // sweep.
        h.MineBlocksAndAssertNumTxes(1, 1)

        return closeTx
}

// AssertWalletLockedBalance asserts the expected amount has been marked as
// locked in the node's WalletBalance response.
func (h *HarnessTest) AssertWalletLockedBalance(hn *node.HarnessNode,
        balance int64) {

        err := wait.NoError(func() error {
                balanceResp := hn.RPC.WalletBalance()
                got := balanceResp.LockedBalance

                if got != balance {
                        return fmt.Errorf("want %d, got %d", balance, got)
                }

                return nil
        }, wait.DefaultTimeout)
        require.NoError(h, err, "%s: timeout checking locked balance",
                hn.Name())
}

// AssertNumPendingSweeps asserts the number of pending sweeps for the given
// node.
func (h *HarnessTest) AssertNumPendingSweeps(hn *node.HarnessNode,
        n int) []*walletrpc.PendingSweep {

        results := make([]*walletrpc.PendingSweep, 0, n)

        err := wait.NoError(func() error {
                resp := hn.RPC.PendingSweeps()
                num := len(resp.PendingSweeps)

                numDesc := "\n"
                for _, s := range resp.PendingSweeps {
                        desc := fmt.Sprintf("op=%v:%v, amt=%v, type=%v, "+
                                "deadline=%v\n", s.Outpoint.TxidStr,
                                s.Outpoint.OutputIndex, s.AmountSat,
                                s.WitnessType, s.DeadlineHeight)
                        numDesc += desc

                        // The deadline height must be set, otherwise the
                        // pending input response is not update-to-date.
                        if s.DeadlineHeight == 0 {
                                return fmt.Errorf("input not updated: %s", desc)
                        }
                }

                if num == n {
                        results = resp.PendingSweeps
                        return nil
                }

                return fmt.Errorf("want %d , got %d, sweeps: %s", n, num,
                        numDesc)
        }, DefaultTimeout)

        require.NoErrorf(h, err, "%s: check pending sweeps timeout", hn.Name())

        return results
}

// FindSweepingTxns asserts the expected number of sweeping txns are found in
// the txns specified and return them.
func (h *HarnessTest) FindSweepingTxns(txns []*wire.MsgTx,
        expectedNumSweeps int, closeTxid chainhash.Hash) []*wire.MsgTx {

        var sweepTxns []*wire.MsgTx

        for _, tx := range txns {
                if tx.TxIn[0].PreviousOutPoint.Hash == closeTxid {
                        sweepTxns = append(sweepTxns, tx)
                }
        }
        require.Len(h, sweepTxns, expectedNumSweeps, "unexpected num of sweeps")

        return sweepTxns
}

lightningnetwork / lnd / 10207481183

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