12209990843

Committed 07 Dec 2024 02:45AM UTC coverage: 58.977% (+1.1%) from 57.911%

Build # 12209990843

Build Type

Pull #9260

github

Committed by

yyforyongyu

Commit Message

lnrpc: sort `Invoice.HTLCs` based on `HtlcIndex`

So the returned HTLCs are ordered.

Pull Request Pull Request #9260: Beat itest [3/3]: fix all itest flakes

Run Details

4 of 132 new or added lines in 9 files covered. (3.03%)

17 existing lines in 8 files now uncovered.

134149 of 227459 relevant lines covered (58.98%)

19442.29 hits per line

Source File
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0.0

/lntest/harness.go

package lntest

import (
        "context"
        "encoding/hex"
        "fmt"
        "strings"
        "testing"
        "time"

        "github.com/btcsuite/btcd/blockchain"
        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/txscript"
        "github.com/btcsuite/btcd/wire"
        "github.com/go-errors/errors"
        "github.com/lightningnetwork/lnd/fn"
        "github.com/lightningnetwork/lnd/input"
        "github.com/lightningnetwork/lnd/kvdb/etcd"
        "github.com/lightningnetwork/lnd/lnrpc"
        "github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
        "github.com/lightningnetwork/lnd/lnrpc/routerrpc"
        "github.com/lightningnetwork/lnd/lnrpc/signrpc"
        "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/lightningnetwork/lnd/lnwallet/chainfee"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/routing"
        "github.com/stretchr/testify/require"
)

const (
        // defaultMinerFeeRate specifies the fee rate in sats when sending
        // outputs from the miner.
        defaultMinerFeeRate = 7500

        // numBlocksSendOutput specifies the number of blocks to mine after
        // sending outputs from the miner.
        numBlocksSendOutput = 2

        // numBlocksOpenChannel specifies the number of blocks mined when
        // opening a channel.
        numBlocksOpenChannel = 6

        // lndErrorChanSize specifies the buffer size used to receive errors
        // from lnd process.
        lndErrorChanSize = 10

        // maxBlocksAllowed specifies the max allowed value to be used when
        // mining blocks.
        maxBlocksAllowed = 100

        finalCltvDelta  = routing.MinCLTVDelta // 18.
        thawHeightDelta = finalCltvDelta * 2   // 36.
)

// TestCase defines a test case that's been used in the integration test.
type TestCase struct {
        // Name specifies the test name.
        Name string

        // TestFunc is the test case wrapped in a function.
        TestFunc func(t *HarnessTest)
}

// HarnessTest builds on top of a testing.T with enhanced error detection. It
// is responsible for managing the interactions among different nodes, and
// providing easy-to-use assertions.
type HarnessTest struct {
        *testing.T

        // miner is a reference to a running full node that can be used to
        // create new blocks on the network.
        miner *miner.HarnessMiner

        // manager handles the start and stop of a given node.
        manager *nodeManager

        // feeService is a web service that provides external fee estimates to
        // lnd.
        feeService WebFeeService

        // Channel for transmitting stderr output from failed lightning node
        // to main process.
        lndErrorChan chan error

        // runCtx is a context with cancel method. It's used to signal when the
        // node needs to quit, and used as the parent context when spawning
        // children contexts for RPC requests.
        runCtx context.Context //nolint:containedctx
        cancel context.CancelFunc

        // stopChainBackend points to the cleanup function returned by the
        // chainBackend.
        stopChainBackend func()

        // cleaned specifies whether the cleanup has been applied for the
        // current HarnessTest.
        cleaned bool

        // currentHeight is the current height of the chain backend.
        currentHeight uint32
}

// harnessOpts contains functional option to modify the behavior of the various
// harness calls.
type harnessOpts struct {
        useAMP bool
}

// defaultHarnessOpts returns a new instance of the harnessOpts with default
// values specified.
func defaultHarnessOpts() harnessOpts {
        return harnessOpts{
                useAMP: false,
        }
}

// HarnessOpt is a functional option that can be used to modify the behavior of
// harness functionality.
type HarnessOpt func(*harnessOpts)

// WithAMP is a functional option that can be used to enable the AMP feature
// for sending payments.
func WithAMP() HarnessOpt {
        return func(h *harnessOpts) {
                h.useAMP = true
        }
}

// NewHarnessTest creates a new instance of a harnessTest from a regular
// testing.T instance.
func NewHarnessTest(t *testing.T, lndBinary string, feeService WebFeeService,
        dbBackend node.DatabaseBackend, nativeSQL bool) *HarnessTest {

        t.Helper()

        // Create the run context.
        ctxt, cancel := context.WithCancel(context.Background())

        manager := newNodeManager(lndBinary, dbBackend, nativeSQL)

        return &HarnessTest{
                T:          t,
                manager:    manager,
                feeService: feeService,
                runCtx:     ctxt,
                cancel:     cancel,
                // We need to use buffered channel here as we don't want to
                // block sending errors.
                lndErrorChan: make(chan error, lndErrorChanSize),
        }
}

// Start will assemble the chain backend and the miner for the HarnessTest. It
// also starts the fee service and watches lnd process error.
func (h *HarnessTest) Start(chain node.BackendConfig,
        miner *miner.HarnessMiner) {

        // Spawn a new goroutine to watch for any fatal errors that any of the
        // running lnd processes encounter. If an error occurs, then the test
        // case should naturally as a result and we log the server error here
        // to help debug.
        go func() {
                select {
                case err, more := <-h.lndErrorChan:
                        if !more {
                                return
                        }
                        h.Logf("lnd finished with error (stderr):\n%v", err)

                case <-h.runCtx.Done():
                        return
                }
        }()

        // Start the fee service.
        err := h.feeService.Start()
        require.NoError(h, err, "failed to start fee service")

        // Assemble the node manager with chainBackend and feeServiceURL.
        h.manager.chainBackend = chain
        h.manager.feeServiceURL = h.feeService.URL()

        // Assemble the miner.
        h.miner = miner

        // Update block height.
        h.updateCurrentHeight()
}

// ChainBackendName returns the chain backend name used in the test.
func (h *HarnessTest) ChainBackendName() string {
        return h.manager.chainBackend.Name()
}

// Context returns the run context used in this test. Usaually it should be
// managed by the test itself otherwise undefined behaviors will occur. It can
// be used, however, when a test needs to have its own context being managed
// differently. In that case, instead of using a background context, the run
// context should be used such that the test context scope can be fully
// controlled.
func (h *HarnessTest) Context() context.Context {
        return h.runCtx
}

// setupWatchOnlyNode initializes a node with the watch-only accounts of an
// associated remote signing instance.
func (h *HarnessTest) setupWatchOnlyNode(name string,
        signerNode *node.HarnessNode, password []byte) *node.HarnessNode {

        // Prepare arguments for watch-only node connected to the remote signer.
        remoteSignerArgs := []string{
                "--remotesigner.enable",
                fmt.Sprintf("--remotesigner.rpchost=localhost:%d",
                        signerNode.Cfg.RPCPort),
                fmt.Sprintf("--remotesigner.tlscertpath=%s",
                        signerNode.Cfg.TLSCertPath),
                fmt.Sprintf("--remotesigner.macaroonpath=%s",
                        signerNode.Cfg.AdminMacPath),
        }

        // Fetch watch-only accounts from the signer node.
        resp := signerNode.RPC.ListAccounts(&walletrpc.ListAccountsRequest{})
        watchOnlyAccounts, err := walletrpc.AccountsToWatchOnly(resp.Accounts)
        require.NoErrorf(h, err, "unable to find watch only accounts for %s",
                name)

        // Create a new watch-only node with remote signer configuration.
        return h.NewNodeRemoteSigner(
                name, remoteSignerArgs, password,
                &lnrpc.WatchOnly{
                        MasterKeyBirthdayTimestamp: 0,
                        MasterKeyFingerprint:       nil,
                        Accounts:                   watchOnlyAccounts,
                },
        )
}

// createAndSendOutput send amt satoshis from the internal mining node to the
// targeted lightning node using a P2WKH address. No blocks are mined so
// transactions will sit unconfirmed in mempool.
func (h *HarnessTest) createAndSendOutput(target *node.HarnessNode,
        amt btcutil.Amount, addrType lnrpc.AddressType) {

        req := &lnrpc.NewAddressRequest{Type: addrType}
        resp := target.RPC.NewAddress(req)
        addr := h.DecodeAddress(resp.Address)
        addrScript := h.PayToAddrScript(addr)

        output := &wire.TxOut{
                PkScript: addrScript,
                Value:    int64(amt),
        }
        h.miner.SendOutput(output, defaultMinerFeeRate)
}

// Stop stops the test harness.
func (h *HarnessTest) Stop() {
        // Do nothing if it's not started.
        if h.runCtx == nil {
                h.Log("HarnessTest is not started")
                return
        }

        h.shutdownAllNodes()

        close(h.lndErrorChan)

        // Stop the fee service.
        err := h.feeService.Stop()
        require.NoError(h, err, "failed to stop fee service")

        // Stop the chainBackend.
        h.stopChainBackend()

        // Stop the miner.
        h.miner.Stop()
}

// RunTestCase executes a harness test case. Any errors or panics will be
// represented as fatal.
func (h *HarnessTest) RunTestCase(testCase *TestCase) {
        defer func() {
                if err := recover(); err != nil {
                        description := errors.Wrap(err, 2).ErrorStack()
                        h.Fatalf("Failed: (%v) panic with: \n%v",
                                testCase.Name, description)
                }
        }()

        testCase.TestFunc(h)
}

// Subtest creates a child HarnessTest, which inherits the harness net and
// stand by nodes created by the parent test. It will return a cleanup function
// which resets  all the standby nodes' configs back to its original state and
// create snapshots of each nodes' internal state.
func (h *HarnessTest) Subtest(t *testing.T) *HarnessTest {
        t.Helper()

        st := &HarnessTest{
                T:            t,
                manager:      h.manager,
                miner:        h.miner,
                feeService:   h.feeService,
                lndErrorChan: make(chan error, lndErrorChanSize),
        }

        // Inherit context from the main test.
        st.runCtx, st.cancel = context.WithCancel(h.runCtx)

        // Inherit the subtest for the miner.
        st.miner.T = st.T

        // Reset fee estimator.
        st.feeService.Reset()

        // Record block height.
        h.updateCurrentHeight()
        startHeight := int32(h.CurrentHeight())

        st.Cleanup(func() {
                // Make sure the test is not consuming too many blocks.
                st.checkAndLimitBlocksMined(startHeight)

                // Don't bother run the cleanups if the test is failed.
                if st.Failed() {
                        st.Log("test failed, skipped cleanup")
                        st.shutdownNodesNoAssert()
                        return
                }

                // Don't run cleanup if it's already done. This can happen if
                // we have multiple level inheritance of the parent harness
                // test. For instance, a `Subtest(st)`.
                if st.cleaned {
                        st.Log("test already cleaned, skipped cleanup")
                        return
                }

                // If found running nodes, shut them down.
                st.shutdownAllNodes()

                // We require the mempool to be cleaned from the test.
                require.Empty(st, st.miner.GetRawMempool(), "mempool not "+
                        "cleaned, please mine blocks to clean them all.")

                // Finally, cancel the run context. We have to do it here
                // because we need to keep the context alive for the above
                // assertions used in cleanup.
                st.cancel()

                // We now want to mark the parent harness as cleaned to avoid
                // running cleanup again since its internal state has been
                // cleaned up by its child harness tests.
                h.cleaned = true
        })

        return st
}

// checkAndLimitBlocksMined asserts that the blocks mined in a single test
// doesn't exceed 50, which implicitly discourage table-drive tests, which are
// hard to maintain and take a long time to run.
func (h *HarnessTest) checkAndLimitBlocksMined(startHeight int32) {
        _, endHeight := h.GetBestBlock()
        blocksMined := endHeight - startHeight

        h.Logf("finished test: %s, start height=%d, end height=%d, mined "+
                "blocks=%d", h.manager.currentTestCase, startHeight, endHeight,
                blocksMined)

        // If the number of blocks is less than 40, we consider the test
        // healthy.
        if blocksMined < 40 {
                return
        }

        // Otherwise log a warning if it's mining more than 40 blocks.
        desc := "!============================================!\n"

        desc += fmt.Sprintf("Too many blocks (%v) mined in one test! Tips:\n",
                blocksMined)

        desc += "1. break test into smaller individual tests, especially if " +
                "this is a table-drive test.\n" +
                "2. use smaller CSV via `--bitcoin.defaultremotedelay=1.`\n" +
                "3. use smaller CLTV via `--bitcoin.timelockdelta=18.`\n" +
                "4. remove unnecessary CloseChannel when test ends.\n" +
                "5. use `CreateSimpleNetwork` for efficient channel creation.\n"
        h.Log(desc)

        // We enforce that the test should not mine more than 50 blocks, which
        // is more than enough to test a multi hop force close scenario.
        require.LessOrEqual(h, int(blocksMined), 50, "cannot mine more than "+
                "50 blocks in one test")
}

// shutdownNodesNoAssert will shutdown all running nodes without assertions.
// This is used when the test has already failed, we don't want to log more
// errors but focusing on the original error.
func (h *HarnessTest) shutdownNodesNoAssert() {
        for _, node := range h.manager.activeNodes {
                _ = h.manager.shutdownNode(node)
        }
}

// shutdownAllNodes will shutdown all running nodes.
func (h *HarnessTest) shutdownAllNodes() {
        var err error
        for _, node := range h.manager.activeNodes {
                err = h.manager.shutdownNode(node)
                if err == nil {
                        continue
                }

                // Instead of returning the error, we will log it instead. This
                // is needed so other nodes can continue their shutdown
                // processes.
                h.Logf("unable to shutdown %s, got err: %v", node.Name(), err)
        }

        require.NoError(h, err, "failed to shutdown all nodes")
}

// cleanupStandbyNode is a function should be called with defer whenever a
// subtest is created. It will reset the standby nodes configs, snapshot the
// states, and validate the node has a clean state.
func (h *HarnessTest) cleanupStandbyNode(hn *node.HarnessNode) {
        // Remove connections made from this test.
        h.removeConnectionns(hn)

        // Delete all payments made from this test.
        hn.RPC.DeleteAllPayments()

        // Check the node's current state with timeout.
        //
        // NOTE: we need to do this in a `wait` because it takes some time for
        // the node to update its internal state. Once the RPCs are synced we
        // can then remove this wait.
        err := wait.NoError(func() error {
                // Update the node's internal state.
                hn.UpdateState()

                // Check the node is in a clean state for the following tests.
                return h.validateNodeState(hn)
        }, wait.DefaultTimeout)
        require.NoError(h, err, "timeout checking node's state")
}

// removeConnectionns will remove all connections made on the standby nodes
// expect the connections between Alice and Bob.
func (h *HarnessTest) removeConnectionns(hn *node.HarnessNode) {
        resp := hn.RPC.ListPeers()
        for _, peer := range resp.Peers {
                hn.RPC.DisconnectPeer(peer.PubKey)
        }
}

// SetTestName set the test case name.
func (h *HarnessTest) SetTestName(name string) {
        cleanTestCaseName := strings.ReplaceAll(name, " ", "_")
        h.manager.currentTestCase = cleanTestCaseName
}

// NewNode creates a new node and asserts its creation. The node is guaranteed
// to have finished its initialization and all its subservers are started.
func (h *HarnessTest) NewNode(name string,
        extraArgs []string) *node.HarnessNode {

        node, err := h.manager.newNode(h.T, name, extraArgs, nil, false)
        require.NoErrorf(h, err, "unable to create new node for %s", name)

        // Start the node.
        err = node.Start(h.runCtx)
        require.NoError(h, err, "failed to start node %s", node.Name())

        return node
}

// NewNodeWithCoins creates a new node and asserts its creation. The node is
// guaranteed to have finished its initialization and all its subservers are
// started. In addition, 5 UTXO of 1 BTC each are sent to the node.
func (h *HarnessTest) NewNodeWithCoins(name string,
        extraArgs []string) *node.HarnessNode {

        node, err := h.manager.newNode(h.T, name, extraArgs, nil, false)
        require.NoErrorf(h, err, "unable to create new node for %s", name)

        // Start the node.
        err = node.Start(h.runCtx)
        require.NoError(h, err, "failed to start node %s", node.Name())

        // Load up the wallets of the node with 5 outputs of 1 BTC each.
        const (
                numOutputs  = 5
                fundAmount  = 1 * btcutil.SatoshiPerBitcoin
                totalAmount = fundAmount * numOutputs
        )

        for i := 0; i < numOutputs; i++ {
                h.createAndSendOutput(
                        node, fundAmount,
                        lnrpc.AddressType_WITNESS_PUBKEY_HASH,
                )
        }

        // Mine a block to confirm the transactions.
        h.MineBlocksAndAssertNumTxes(1, numOutputs)

        // Now block until the wallet have fully synced up.
        h.WaitForBalanceConfirmed(node, totalAmount)

        return node
}

// Shutdown shuts down the given node and asserts that no errors occur.
func (h *HarnessTest) Shutdown(node *node.HarnessNode) {
        err := h.manager.shutdownNode(node)
        require.NoErrorf(h, err, "unable to shutdown %v in %v", node.Name(),
                h.manager.currentTestCase)
}

// SuspendNode stops the given node and returns a callback that can be used to
// start it again.
func (h *HarnessTest) SuspendNode(node *node.HarnessNode) func() error {
        err := node.Stop()
        require.NoErrorf(h, err, "failed to stop %s", node.Name())

        // Remove the node from active nodes.
        delete(h.manager.activeNodes, node.Cfg.NodeID)

        return func() error {
                h.manager.registerNode(node)

                if err := node.Start(h.runCtx); err != nil {
                        return err
                }
                h.WaitForBlockchainSync(node)

                return nil
        }
}

// RestartNode restarts a given node, unlocks it and asserts it's successfully
// started.
func (h *HarnessTest) RestartNode(hn *node.HarnessNode) {
        err := h.manager.restartNode(h.runCtx, hn, nil)
        require.NoErrorf(h, err, "failed to restart node %s", hn.Name())

        err = h.manager.unlockNode(hn)
        require.NoErrorf(h, err, "failed to unlock node %s", hn.Name())

        if !hn.Cfg.SkipUnlock {
                // Give the node some time to catch up with the chain before we
                // continue with the tests.
                h.WaitForBlockchainSync(hn)
        }
}

// RestartNodeNoUnlock restarts a given node without unlocking its wallet.
func (h *HarnessTest) RestartNodeNoUnlock(hn *node.HarnessNode) {
        err := h.manager.restartNode(h.runCtx, hn, nil)
        require.NoErrorf(h, err, "failed to restart node %s", hn.Name())
}

// RestartNodeWithChanBackups restarts a given node with the specified channel
// backups.
func (h *HarnessTest) RestartNodeWithChanBackups(hn *node.HarnessNode,
        chanBackups ...*lnrpc.ChanBackupSnapshot) {

        err := h.manager.restartNode(h.runCtx, hn, nil)
        require.NoErrorf(h, err, "failed to restart node %s", hn.Name())

        err = h.manager.unlockNode(hn, chanBackups...)
        require.NoErrorf(h, err, "failed to unlock node %s", hn.Name())

        // Give the node some time to catch up with the chain before we
        // continue with the tests.
        h.WaitForBlockchainSync(hn)
}

// RestartNodeWithExtraArgs updates the node's config and restarts it.
func (h *HarnessTest) RestartNodeWithExtraArgs(hn *node.HarnessNode,
        extraArgs []string) {

        hn.SetExtraArgs(extraArgs)
        h.RestartNode(hn)
}

// NewNodeWithSeed fully initializes a new HarnessNode after creating a fresh
// aezeed. The provided password is used as both the aezeed password and the
// wallet password. The generated mnemonic is returned along with the
// initialized harness node.
func (h *HarnessTest) NewNodeWithSeed(name string,
        extraArgs []string, password []byte,
        statelessInit bool) (*node.HarnessNode, []string, []byte) {

        // Create a request to generate a new aezeed. The new seed will have
        // the same password as the internal wallet.
        req := &lnrpc.GenSeedRequest{
                AezeedPassphrase: password,
                SeedEntropy:      nil,
        }

        return h.newNodeWithSeed(name, extraArgs, req, statelessInit)
}

// newNodeWithSeed creates and initializes a new HarnessNode such that it'll be
// ready to accept RPC calls. A `GenSeedRequest` is needed to generate the
// seed.
func (h *HarnessTest) newNodeWithSeed(name string,
        extraArgs []string, req *lnrpc.GenSeedRequest,
        statelessInit bool) (*node.HarnessNode, []string, []byte) {

        node, err := h.manager.newNode(
                h.T, name, extraArgs, req.AezeedPassphrase, true,
        )
        require.NoErrorf(h, err, "unable to create new node for %s", name)

        // Start the node with seed only, which will only create the `State`
        // and `WalletUnlocker` clients.
        err = node.StartWithNoAuth(h.runCtx)
        require.NoErrorf(h, err, "failed to start node %s", node.Name())

        // Generate a new seed.
        genSeedResp := node.RPC.GenSeed(req)

        // With the seed created, construct the init request to the node,
        // including the newly generated seed.
        initReq := &lnrpc.InitWalletRequest{
                WalletPassword:     req.AezeedPassphrase,
                CipherSeedMnemonic: genSeedResp.CipherSeedMnemonic,
                AezeedPassphrase:   req.AezeedPassphrase,
                StatelessInit:      statelessInit,
        }

        // Pass the init request via rpc to finish unlocking the node. This
        // will also initialize the macaroon-authenticated LightningClient.
        adminMac, err := h.manager.initWalletAndNode(node, initReq)
        require.NoErrorf(h, err, "failed to unlock and init node %s",
                node.Name())

        // In stateless initialization mode we get a macaroon back that we have
        // to return to the test, otherwise gRPC calls won't be possible since
        // there are no macaroon files created in that mode.
        // In stateful init the admin macaroon will just be nil.
        return node, genSeedResp.CipherSeedMnemonic, adminMac
}

// RestoreNodeWithSeed fully initializes a HarnessNode using a chosen mnemonic,
// password, recovery window, and optionally a set of static channel backups.
// After providing the initialization request to unlock the node, this method
// will finish initializing the LightningClient such that the HarnessNode can
// be used for regular rpc operations.
func (h *HarnessTest) RestoreNodeWithSeed(name string, extraArgs []string,
        password []byte, mnemonic []string, rootKey string,
        recoveryWindow int32,
        chanBackups *lnrpc.ChanBackupSnapshot) *node.HarnessNode {

        n, err := h.manager.newNode(h.T, name, extraArgs, password, true)
        require.NoErrorf(h, err, "unable to create new node for %s", name)

        // Start the node with seed only, which will only create the `State`
        // and `WalletUnlocker` clients.
        err = n.StartWithNoAuth(h.runCtx)
        require.NoErrorf(h, err, "failed to start node %s", n.Name())

        // Create the wallet.
        initReq := &lnrpc.InitWalletRequest{
                WalletPassword:     password,
                CipherSeedMnemonic: mnemonic,
                AezeedPassphrase:   password,
                ExtendedMasterKey:  rootKey,
                RecoveryWindow:     recoveryWindow,
                ChannelBackups:     chanBackups,
        }
        _, err = h.manager.initWalletAndNode(n, initReq)
        require.NoErrorf(h, err, "failed to unlock and init node %s",
                n.Name())

        return n
}

// NewNodeEtcd starts a new node with seed that'll use an external etcd
// database as its storage. The passed cluster flag indicates that we'd like
// the node to join the cluster leader election. We won't wait until RPC is
// available (this is useful when the node is not expected to become the leader
// right away).
func (h *HarnessTest) NewNodeEtcd(name string, etcdCfg *etcd.Config,
        password []byte, cluster bool,
        leaderSessionTTL int) *node.HarnessNode {

        // We don't want to use the embedded etcd instance.
        h.manager.dbBackend = node.BackendBbolt

        extraArgs := node.ExtraArgsEtcd(
                etcdCfg, name, cluster, leaderSessionTTL,
        )
        node, err := h.manager.newNode(h.T, name, extraArgs, password, true)
        require.NoError(h, err, "failed to create new node with etcd")

        // Start the node daemon only.
        err = node.StartLndCmd(h.runCtx)
        require.NoError(h, err, "failed to start node %s", node.Name())

        return node
}

// NewNodeWithSeedEtcd starts a new node with seed that'll use an external etcd
// database as its storage. The passed cluster flag indicates that we'd like
// the node to join the cluster leader election.
func (h *HarnessTest) NewNodeWithSeedEtcd(name string, etcdCfg *etcd.Config,
        password []byte, statelessInit, cluster bool,
        leaderSessionTTL int) (*node.HarnessNode, []string, []byte) {

        // We don't want to use the embedded etcd instance.
        h.manager.dbBackend = node.BackendBbolt

        // Create a request to generate a new aezeed. The new seed will have
        // the same password as the internal wallet.
        req := &lnrpc.GenSeedRequest{
                AezeedPassphrase: password,
                SeedEntropy:      nil,
        }

        extraArgs := node.ExtraArgsEtcd(
                etcdCfg, name, cluster, leaderSessionTTL,
        )

        return h.newNodeWithSeed(name, extraArgs, req, statelessInit)
}

// NewNodeRemoteSigner creates a new remote signer node and asserts its
// creation.
func (h *HarnessTest) NewNodeRemoteSigner(name string, extraArgs []string,
        password []byte, watchOnly *lnrpc.WatchOnly) *node.HarnessNode {

        hn, err := h.manager.newNode(h.T, name, extraArgs, password, true)
        require.NoErrorf(h, err, "unable to create new node for %s", name)

        err = hn.StartWithNoAuth(h.runCtx)
        require.NoError(h, err, "failed to start node %s", name)

        // With the seed created, construct the init request to the node,
        // including the newly generated seed.
        initReq := &lnrpc.InitWalletRequest{
                WalletPassword: password,
                WatchOnly:      watchOnly,
        }

        // Pass the init request via rpc to finish unlocking the node. This
        // will also initialize the macaroon-authenticated LightningClient.
        _, err = h.manager.initWalletAndNode(hn, initReq)
        require.NoErrorf(h, err, "failed to init node %s", name)

        return hn
}

// KillNode kills the node and waits for the node process to stop.
func (h *HarnessTest) KillNode(hn *node.HarnessNode) {
        delete(h.manager.activeNodes, hn.Cfg.NodeID)

        h.Logf("Manually killing the node %s", hn.Name())
        require.NoErrorf(h, hn.KillAndWait(), "%s: kill got error", hn.Name())
}

// SetFeeEstimate sets a fee rate to be returned from fee estimator.
//
// NOTE: this method will set the fee rate for a conf target of 1, which is the
// fallback fee rate for a `WebAPIEstimator` if a higher conf target's fee rate
// is not set. This means if the fee rate for conf target 6 is set, the fee
// estimator will use that value instead.
func (h *HarnessTest) SetFeeEstimate(fee chainfee.SatPerKWeight) {
        h.feeService.SetFeeRate(fee, 1)
}

// SetFeeEstimateWithConf sets a fee rate of a specified conf target to be
// returned from fee estimator.
func (h *HarnessTest) SetFeeEstimateWithConf(
        fee chainfee.SatPerKWeight, conf uint32) {

        h.feeService.SetFeeRate(fee, conf)
}

// SetMinRelayFeerate sets a min relay fee rate to be returned from fee
// estimator.
func (h *HarnessTest) SetMinRelayFeerate(fee chainfee.SatPerKVByte) {
        h.feeService.SetMinRelayFeerate(fee)
}

// validateNodeState checks that the node doesn't have any uncleaned states
// which will affect its following tests.
func (h *HarnessTest) validateNodeState(hn *node.HarnessNode) error {
        errStr := func(subject string) error {
                return fmt.Errorf("%s: found %s channels, please close "+
                        "them properly", hn.Name(), subject)
        }
        // If the node still has open channels, it's most likely that the
        // current test didn't close it properly.
        if hn.State.OpenChannel.Active != 0 {
                return errStr("active")
        }
        if hn.State.OpenChannel.Public != 0 {
                return errStr("public")
        }
        if hn.State.OpenChannel.Private != 0 {
                return errStr("private")
        }
        if hn.State.OpenChannel.Pending != 0 {
                return errStr("pending open")
        }

        // The number of pending force close channels should be zero.
        if hn.State.CloseChannel.PendingForceClose != 0 {
                return errStr("pending force")
        }

        // The number of waiting close channels should be zero.
        if hn.State.CloseChannel.WaitingClose != 0 {
                return errStr("waiting close")
        }

        // Ths number of payments should be zero.
        if hn.State.Payment.Total != 0 {
                return fmt.Errorf("%s: found uncleaned payments, please "+
                        "delete all of them properly", hn.Name())
        }

        // The number of public edges should be zero.
        if hn.State.Edge.Public != 0 {
                return fmt.Errorf("%s: found active public egdes, please "+
                        "clean them properly", hn.Name())
        }

        // The number of edges should be zero.
        if hn.State.Edge.Total != 0 {
                return fmt.Errorf("%s: found active edges, please "+
                        "clean them properly", hn.Name())
        }

        return nil
}

// GetChanPointFundingTxid takes a channel point and converts it into a chain
// hash.
func (h *HarnessTest) GetChanPointFundingTxid(
        cp *lnrpc.ChannelPoint) chainhash.Hash {

        txid, err := lnrpc.GetChanPointFundingTxid(cp)
        require.NoError(h, err, "unable to get txid")

        return *txid
}

// OutPointFromChannelPoint creates an outpoint from a given channel point.
func (h *HarnessTest) OutPointFromChannelPoint(
        cp *lnrpc.ChannelPoint) wire.OutPoint {

        txid := h.GetChanPointFundingTxid(cp)
        return wire.OutPoint{
                Hash:  txid,
                Index: cp.OutputIndex,
        }
}

// OpenChannelParams houses the params to specify when opening a new channel.
type OpenChannelParams struct {
        // Amt is the local amount being put into the channel.
        Amt btcutil.Amount

        // PushAmt is the amount that should be pushed to the remote when the
        // channel is opened.
        PushAmt btcutil.Amount

        // Private is a boolan indicating whether the opened channel should be
        // private.
        Private bool

        // SpendUnconfirmed is a boolean indicating whether we can utilize
        // unconfirmed outputs to fund the channel.
        SpendUnconfirmed bool

        // MinHtlc is the htlc_minimum_msat value set when opening the channel.
        MinHtlc lnwire.MilliSatoshi

        // RemoteMaxHtlcs is the remote_max_htlcs value set when opening the
        // channel, restricting the number of concurrent HTLCs the remote party
        // can add to a commitment.
        RemoteMaxHtlcs uint16

        // FundingShim is an optional funding shim that the caller can specify
        // in order to modify the channel funding workflow.
        FundingShim *lnrpc.FundingShim

        // SatPerVByte is the amount of satoshis to spend in chain fees per
        // virtual byte of the transaction.
        SatPerVByte btcutil.Amount

        // ConfTarget is the number of blocks that the funding transaction
        // should be confirmed in.
        ConfTarget fn.Option[int32]

        // CommitmentType is the commitment type that should be used for the
        // channel to be opened.
        CommitmentType lnrpc.CommitmentType

        // ZeroConf is used to determine if the channel will be a zero-conf
        // channel. This only works if the explicit negotiation is used with
        // anchors or script enforced leases.
        ZeroConf bool

        // ScidAlias denotes whether the channel will be an option-scid-alias
        // channel type negotiation.
        ScidAlias bool

        // BaseFee is the channel base fee applied during the channel
        // announcement phase.
        BaseFee uint64

        // FeeRate is the channel fee rate in ppm applied during the channel
        // announcement phase.
        FeeRate uint64

        // UseBaseFee, if set, instructs the downstream logic to apply the
        // user-specified channel base fee to the channel update announcement.
        // If set to false it avoids applying a base fee of 0 and instead
        // activates the default configured base fee.
        UseBaseFee bool

        // UseFeeRate, if set, instructs the downstream logic to apply the
        // user-specified channel fee rate to the channel update announcement.
        // If set to false it avoids applying a fee rate of 0 and instead
        // activates the default configured fee rate.
        UseFeeRate bool

        // FundMax is a boolean indicating whether the channel should be funded
        // with the maximum possible amount from the wallet.
        FundMax bool

        // An optional note-to-self containing some useful information about the
        // channel. This is stored locally only, and is purely for reference. It
        // has no bearing on the channel's operation. Max allowed length is 500
        // characters.
        Memo string

        // Outpoints is a list of client-selected outpoints that should be used
        // for funding a channel. If Amt is specified then this amount is
        // allocated from the sum of outpoints towards funding. If the
        // FundMax flag is specified the entirety of selected funds is
        // allocated towards channel funding.
        Outpoints []*lnrpc.OutPoint

        // CloseAddress sets the upfront_shutdown_script parameter during
        // channel open. It is expected to be encoded as a bitcoin address.
        CloseAddress string
}

// prepareOpenChannel waits for both nodes to be synced to chain and returns an
// OpenChannelRequest.
func (h *HarnessTest) prepareOpenChannel(srcNode, destNode *node.HarnessNode,
        p OpenChannelParams) *lnrpc.OpenChannelRequest {

        // Wait until srcNode and destNode have the latest chain synced.
        // Otherwise, we may run into a check within the funding manager that
        // prevents any funding workflows from being kicked off if the chain
        // isn't yet synced.
        h.WaitForBlockchainSync(srcNode)
        h.WaitForBlockchainSync(destNode)

        // Specify the minimal confirmations of the UTXOs used for channel
        // funding.
        minConfs := int32(1)
        if p.SpendUnconfirmed {
                minConfs = 0
        }

        // Get the requested conf target. If not set, default to 6.
        confTarget := p.ConfTarget.UnwrapOr(6)

        // If there's fee rate set, unset the conf target.
        if p.SatPerVByte != 0 {
                confTarget = 0
        }

        // Prepare the request.
        return &lnrpc.OpenChannelRequest{
                NodePubkey:         destNode.PubKey[:],
                LocalFundingAmount: int64(p.Amt),
                PushSat:            int64(p.PushAmt),
                Private:            p.Private,
                TargetConf:         confTarget,
                MinConfs:           minConfs,
                SpendUnconfirmed:   p.SpendUnconfirmed,
                MinHtlcMsat:        int64(p.MinHtlc),
                RemoteMaxHtlcs:     uint32(p.RemoteMaxHtlcs),
                FundingShim:        p.FundingShim,
                SatPerVbyte:        uint64(p.SatPerVByte),
                CommitmentType:     p.CommitmentType,
                ZeroConf:           p.ZeroConf,
                ScidAlias:          p.ScidAlias,
                BaseFee:            p.BaseFee,
                FeeRate:            p.FeeRate,
                UseBaseFee:         p.UseBaseFee,
                UseFeeRate:         p.UseFeeRate,
                FundMax:            p.FundMax,
                Memo:               p.Memo,
                Outpoints:          p.Outpoints,
                CloseAddress:       p.CloseAddress,
        }
}

// OpenChannelAssertPending attempts to open a channel between srcNode and
// destNode with the passed channel funding parameters. Once the `OpenChannel`
// is called, it will consume the first event it receives from the open channel
// client and asserts it's a channel pending event.
func (h *HarnessTest) openChannelAssertPending(srcNode,
        destNode *node.HarnessNode,
        p OpenChannelParams) (*lnrpc.PendingUpdate, rpc.OpenChanClient) {

        // Prepare the request and open the channel.
        openReq := h.prepareOpenChannel(srcNode, destNode, p)
        respStream := srcNode.RPC.OpenChannel(openReq)

        // Consume the "channel pending" update. This waits until the node
        // notifies us that the final message in the channel funding workflow
        // has been sent to the remote node.
        resp := h.ReceiveOpenChannelUpdate(respStream)

        // Check that the update is channel pending.
        update, ok := resp.Update.(*lnrpc.OpenStatusUpdate_ChanPending)
        require.Truef(h, ok, "expected channel pending: update, instead got %v",
                resp)

        return update.ChanPending, respStream
}

// OpenChannelAssertPending attempts to open a channel between srcNode and
// destNode with the passed channel funding parameters. Once the `OpenChannel`
// is called, it will consume the first event it receives from the open channel
// client and asserts it's a channel pending event. It returns the
// `PendingUpdate`.
func (h *HarnessTest) OpenChannelAssertPending(srcNode,
        destNode *node.HarnessNode, p OpenChannelParams) *lnrpc.PendingUpdate {

        resp, _ := h.openChannelAssertPending(srcNode, destNode, p)
        return resp
}

// OpenChannelAssertStream attempts to open a channel between srcNode and
// destNode with the passed channel funding parameters. Once the `OpenChannel`
// is called, it will consume the first event it receives from the open channel
// client and asserts it's a channel pending event. It returns the open channel
// stream.
func (h *HarnessTest) OpenChannelAssertStream(srcNode,
        destNode *node.HarnessNode, p OpenChannelParams) rpc.OpenChanClient {

        _, stream := h.openChannelAssertPending(srcNode, destNode, p)
        return stream
}

// OpenChannel attempts to open a channel with the specified parameters
// extended from Alice to Bob. Additionally, for public channels, it will mine
// extra blocks so they are announced to the network. In specific, the
// following items are asserted,
//   - for non-zero conf channel, 1 blocks will be mined to confirm the funding
//     tx.
//   - both nodes should see the channel edge update in their network graph.
//   - both nodes can report the status of the new channel from ListChannels.
//   - extra blocks are mined if it's a public channel.
func (h *HarnessTest) OpenChannel(alice, bob *node.HarnessNode,
        p OpenChannelParams) *lnrpc.ChannelPoint {

        // First, open the channel without announcing it.
        cp := h.OpenChannelNoAnnounce(alice, bob, p)

        // If this is a private channel, there's no need to mine extra blocks
        // since it will never be announced to the network.
        if p.Private {
                return cp
        }

        // Mine extra blocks to announce the channel.
        if p.ZeroConf {
                // For a zero-conf channel, no blocks have been mined so we
                // need to mine 6 blocks.
                //
                // Mine 1 block to confirm the funding transaction.
                h.MineBlocksAndAssertNumTxes(numBlocksOpenChannel, 1)
        } else {
                // For a regular channel, 1 block has already been mined to
                // confirm the funding transaction, so we mine 5 blocks.
                h.MineBlocks(numBlocksOpenChannel - 1)
        }

        return cp
}

// OpenChannelNoAnnounce attempts to open a channel with the specified
// parameters extended from Alice to Bob without mining the necessary blocks to
// announce the channel. Additionally, the following items are asserted,
//   - for non-zero conf channel, 1 blocks will be mined to confirm the funding
//     tx.
//   - both nodes should see the channel edge update in their network graph.
//   - both nodes can report the status of the new channel from ListChannels.
func (h *HarnessTest) OpenChannelNoAnnounce(alice, bob *node.HarnessNode,
        p OpenChannelParams) *lnrpc.ChannelPoint {

        chanOpenUpdate := h.OpenChannelAssertStream(alice, bob, p)

        // Open a zero conf channel.
        if p.ZeroConf {
                return h.openChannelZeroConf(alice, bob, chanOpenUpdate)
        }

        // Open a non-zero conf channel.
        return h.openChannel(alice, bob, chanOpenUpdate)
}

// openChannel attempts to open a channel with the specified parameters
// extended from Alice to Bob. Additionally, the following items are asserted,
//   - 1 block is mined and the funding transaction should be found in it.
//   - both nodes should see the channel edge update in their network graph.
//   - both nodes can report the status of the new channel from ListChannels.
func (h *HarnessTest) openChannel(alice, bob *node.HarnessNode,
        stream rpc.OpenChanClient) *lnrpc.ChannelPoint {

        // Mine 1 block to confirm the funding transaction.
        block := h.MineBlocksAndAssertNumTxes(1, 1)[0]

        // Wait for the channel open event.
        fundingChanPoint := h.WaitForChannelOpenEvent(stream)

        // Check that the funding tx is found in the first block.
        fundingTxID := h.GetChanPointFundingTxid(fundingChanPoint)
        h.AssertTxInBlock(block, fundingTxID)

        // Check that both alice and bob have seen the channel from their
        // network topology.
        h.AssertChannelInGraph(alice, fundingChanPoint)
        h.AssertChannelInGraph(bob, fundingChanPoint)

        // Check that the channel can be seen in their ListChannels.
        h.AssertChannelExists(alice, fundingChanPoint)
        h.AssertChannelExists(bob, fundingChanPoint)

        return fundingChanPoint
}

// openChannelZeroConf attempts to open a channel with the specified parameters
// extended from Alice to Bob. Additionally, the following items are asserted,
//   - both nodes should see the channel edge update in their network graph.
//   - both nodes can report the status of the new channel from ListChannels.
func (h *HarnessTest) openChannelZeroConf(alice, bob *node.HarnessNode,
        stream rpc.OpenChanClient) *lnrpc.ChannelPoint {

        // Wait for the channel open event.
        fundingChanPoint := h.WaitForChannelOpenEvent(stream)

        // Check that both alice and bob have seen the channel from their
        // network topology.
        h.AssertChannelInGraph(alice, fundingChanPoint)
        h.AssertChannelInGraph(bob, fundingChanPoint)

        // Finally, check that the channel can be seen in their ListChannels.
        h.AssertChannelExists(alice, fundingChanPoint)
        h.AssertChannelExists(bob, fundingChanPoint)

        return fundingChanPoint
}

// OpenChannelAssertErr opens a channel between node srcNode and destNode,
// asserts that the expected error is returned from the channel opening.
func (h *HarnessTest) OpenChannelAssertErr(srcNode, destNode *node.HarnessNode,
        p OpenChannelParams, expectedErr error) {

        // Prepare the request and open the channel.
        openReq := h.prepareOpenChannel(srcNode, destNode, p)
        respStream := srcNode.RPC.OpenChannel(openReq)

        // Receive an error to be sent from the stream.
        _, err := h.receiveOpenChannelUpdate(respStream)
        require.NotNil(h, err, "expected channel opening to fail")

        // Use string comparison here as we haven't codified all the RPC errors
        // yet.
        require.Containsf(h, err.Error(), expectedErr.Error(), "unexpected "+
                "error returned, want %v, got %v", expectedErr, err)
}

// CloseChannelAssertPending attempts to close the channel indicated by the
// passed channel point, initiated by the passed node. Once the CloseChannel
// rpc is called, it will consume one event and assert it's a close pending
// event. In addition, it will check that the closing tx can be found in the
// mempool.
func (h *HarnessTest) CloseChannelAssertPending(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint,
        force bool) (rpc.CloseChanClient, chainhash.Hash) {

        // Calls the rpc to close the channel.
        closeReq := &lnrpc.CloseChannelRequest{
                ChannelPoint: cp,
                Force:        force,
                NoWait:       true,
        }

        // For coop close, we use a default confg target of 6.
        if !force {
                closeReq.TargetConf = 6
        }

        var (
                stream rpc.CloseChanClient
                event  *lnrpc.CloseStatusUpdate
                err    error
        )

        // Consume the "channel close" update in order to wait for the closing
        // transaction to be broadcast, then wait for the closing tx to be seen
        // within the network.
        stream = hn.RPC.CloseChannel(closeReq)
        _, err = h.ReceiveCloseChannelUpdate(stream)
        require.NoError(h, err, "close channel update got error: %v", err)

        event, err = h.ReceiveCloseChannelUpdate(stream)
        if err != nil {
                h.Logf("Test: %s, close channel got error: %v",
                        h.manager.currentTestCase, err)
        }
        require.NoError(h, err, "retry closing channel failed")

        pendingClose, ok := event.Update.(*lnrpc.CloseStatusUpdate_ClosePending)
        require.Truef(h, ok, "expected channel close update, instead got %v",
                pendingClose)

        closeTxid, err := chainhash.NewHash(pendingClose.ClosePending.Txid)
        require.NoErrorf(h, err, "unable to decode closeTxid: %v",
                pendingClose.ClosePending.Txid)

        // Assert the closing tx is in the mempool.
        h.miner.AssertTxInMempool(*closeTxid)

        return stream, *closeTxid
}

// CloseChannel attempts to coop close a non-anchored channel identified by the
// passed channel point owned by the passed harness node. The following items
// are asserted,
//  1. a close pending event is sent from the close channel client.
//  2. the closing tx is found in the mempool.
//  3. the node reports the channel being waiting to close.
//  4. a block is mined and the closing tx should be found in it.
//  5. the node reports zero waiting close channels.
//  6. the node receives a topology update regarding the channel close.
func (h *HarnessTest) CloseChannel(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint) chainhash.Hash {

        stream, _ := h.CloseChannelAssertPending(hn, cp, false)

        return h.AssertStreamChannelCoopClosed(hn, cp, false, stream)
}

// ForceCloseChannel attempts to force close a non-anchored channel identified
// by the passed channel point owned by the passed harness node. The following
// items are asserted,
//  1. a close pending event is sent from the close channel client.
//  2. the closing tx is found in the mempool.
//  3. the node reports the channel being waiting to close.
//  4. a block is mined and the closing tx should be found in it.
//  5. the node reports zero waiting close channels.
//  6. the node receives a topology update regarding the channel close.
//  7. mine DefaultCSV-1 blocks.
//  8. the node reports zero pending force close channels.
func (h *HarnessTest) ForceCloseChannel(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint) chainhash.Hash {

        stream, _ := h.CloseChannelAssertPending(hn, cp, true)

        closingTxid := h.AssertStreamChannelForceClosed(hn, cp, false, stream)

        // Cleanup the force close.
        h.CleanupForceClose(hn)

        return closingTxid
}

// CloseChannelAssertErr closes the given channel and asserts an error
// returned.
func (h *HarnessTest) CloseChannelAssertErr(hn *node.HarnessNode,
        cp *lnrpc.ChannelPoint, force bool) error {

        // Calls the rpc to close the channel.
        closeReq := &lnrpc.CloseChannelRequest{
                ChannelPoint: cp,
                Force:        force,
        }
        stream := hn.RPC.CloseChannel(closeReq)

        // Consume the "channel close" update in order to wait for the closing
        // transaction to be broadcast, then wait for the closing tx to be seen
        // within the network.
        _, err := h.ReceiveCloseChannelUpdate(stream)
        require.Errorf(h, err, "%s: expect close channel to return an error",
                hn.Name())

        return err
}

// IsNeutrinoBackend returns a bool indicating whether the node is using a
// neutrino as its backend. This is useful when we want to skip certain tests
// which cannot be done with a neutrino backend.
func (h *HarnessTest) IsNeutrinoBackend() bool {
        return h.manager.chainBackend.Name() == NeutrinoBackendName
}

// fundCoins attempts to send amt satoshis from the internal mining node to the
// targeted lightning node. The confirmed boolean indicates whether the
// transaction that pays to the target should confirm. For neutrino backend,
// the `confirmed` param is ignored.
func (h *HarnessTest) fundCoins(amt btcutil.Amount, target *node.HarnessNode,
        addrType lnrpc.AddressType, confirmed bool) {

        initialBalance := target.RPC.WalletBalance()

        // First, obtain an address from the target lightning node, preferring
        // to receive a p2wkh address s.t the output can immediately be used as
        // an input to a funding transaction.
        req := &lnrpc.NewAddressRequest{Type: addrType}
        resp := target.RPC.NewAddress(req)
        addr := h.DecodeAddress(resp.Address)
        addrScript := h.PayToAddrScript(addr)

        // Generate a transaction which creates an output to the target
        // pkScript of the desired amount.
        output := &wire.TxOut{
                PkScript: addrScript,
                Value:    int64(amt),
        }
        h.miner.SendOutput(output, defaultMinerFeeRate)

        // Encode the pkScript in hex as this the format that it will be
        // returned via rpc.
        expPkScriptStr := hex.EncodeToString(addrScript)

        // Now, wait for ListUnspent to show the unconfirmed transaction
        // containing the correct pkscript.
        //
        // Since neutrino doesn't support unconfirmed outputs, skip this check.
        if !h.IsNeutrinoBackend() {
                utxos := h.AssertNumUTXOsUnconfirmed(target, 1)

                // Assert that the lone unconfirmed utxo contains the same
                // pkscript as the output generated above.
                pkScriptStr := utxos[0].PkScript
                require.Equal(h, pkScriptStr, expPkScriptStr,
                        "pkscript mismatch")

                expectedBalance := btcutil.Amount(
                        initialBalance.UnconfirmedBalance,
                ) + amt
                h.WaitForBalanceUnconfirmed(target, expectedBalance)
        }

        // If the transaction should remain unconfirmed, then we'll wait until
        // the target node's unconfirmed balance reflects the expected balance
        // and exit.
        if !confirmed {
                return
        }

        // Otherwise, we'll generate 1 new blocks to ensure the output gains a
        // sufficient number of confirmations and wait for the balance to
        // reflect what's expected.
        h.MineBlocksAndAssertNumTxes(1, 1)

        expectedBalance := btcutil.Amount(initialBalance.ConfirmedBalance) + amt
        h.WaitForBalanceConfirmed(target, expectedBalance)
}

// FundCoins attempts to send amt satoshis from the internal mining node to the
// targeted lightning node using a P2WKH address. 1 blocks are mined after in
// order to confirm the transaction.
func (h *HarnessTest) FundCoins(amt btcutil.Amount, hn *node.HarnessNode) {
        h.fundCoins(amt, hn, lnrpc.AddressType_WITNESS_PUBKEY_HASH, true)
}

// FundCoinsUnconfirmed attempts to send amt satoshis from the internal mining
// node to the targeted lightning node using a P2WKH address. No blocks are
// mined after and the UTXOs are unconfirmed.
func (h *HarnessTest) FundCoinsUnconfirmed(amt btcutil.Amount,
        hn *node.HarnessNode) {

        h.fundCoins(amt, hn, lnrpc.AddressType_WITNESS_PUBKEY_HASH, false)
}

// FundCoinsNP2WKH attempts to send amt satoshis from the internal mining node
// to the targeted lightning node using a NP2WKH address.
func (h *HarnessTest) FundCoinsNP2WKH(amt btcutil.Amount,
        target *node.HarnessNode) {

        h.fundCoins(amt, target, lnrpc.AddressType_NESTED_PUBKEY_HASH, true)
}

// FundCoinsP2TR attempts to send amt satoshis from the internal mining node to
// the targeted lightning node using a P2TR address.
func (h *HarnessTest) FundCoinsP2TR(amt btcutil.Amount,
        target *node.HarnessNode) {

        h.fundCoins(amt, target, lnrpc.AddressType_TAPROOT_PUBKEY, true)
}

// FundNumCoins attempts to send the given number of UTXOs from the internal
// mining node to the targeted lightning node using a P2WKH address. Each UTXO
// has an amount of 1 BTC. 1 blocks are mined to confirm the tx.
func (h *HarnessTest) FundNumCoins(hn *node.HarnessNode, num int) {
        // Get the initial balance first.
        resp := hn.RPC.WalletBalance()
        initialBalance := btcutil.Amount(resp.ConfirmedBalance)

        const fundAmount = 1 * btcutil.SatoshiPerBitcoin

        // Send out the outputs from the miner.
        for i := 0; i < num; i++ {
                h.createAndSendOutput(
                        hn, fundAmount, lnrpc.AddressType_WITNESS_PUBKEY_HASH,
                )
        }

        // Wait for ListUnspent to show the correct number of unconfirmed
        // UTXOs.
        //
        // Since neutrino doesn't support unconfirmed outputs, skip this check.
        if !h.IsNeutrinoBackend() {
                h.AssertNumUTXOsUnconfirmed(hn, num)
        }

        // Mine a block to confirm the transactions.
        h.MineBlocksAndAssertNumTxes(1, num)

        // Now block until the wallet have fully synced up.
        totalAmount := btcutil.Amount(fundAmount * num)
        expectedBalance := initialBalance + totalAmount
        h.WaitForBalanceConfirmed(hn, expectedBalance)
}

// completePaymentRequestsAssertStatus sends payments from a node to complete
// all payment requests. This function does not return until all payments
// have reached the specified status.
func (h *HarnessTest) completePaymentRequestsAssertStatus(hn *node.HarnessNode,
        paymentRequests []string, status lnrpc.Payment_PaymentStatus,
        opts ...HarnessOpt) {

        payOpts := defaultHarnessOpts()
        for _, opt := range opts {
                opt(&payOpts)
        }

        // Create a buffered chan to signal the results.
        results := make(chan rpc.PaymentClient, len(paymentRequests))

        // send sends a payment and asserts if it doesn't succeeded.
        send := func(payReq string) {
                req := &routerrpc.SendPaymentRequest{
                        PaymentRequest: payReq,
                        TimeoutSeconds: int32(wait.PaymentTimeout.Seconds()),
                        FeeLimitMsat:   noFeeLimitMsat,
                        Amp:            payOpts.useAMP,
                }
                stream := hn.RPC.SendPayment(req)

                // Signal sent succeeded.
                results <- stream
        }

        // Launch all payments simultaneously.
        for _, payReq := range paymentRequests {
                payReqCopy := payReq
                go send(payReqCopy)
        }

        // Wait for all payments to report the expected status.
        timer := time.After(wait.PaymentTimeout)
        select {
        case stream := <-results:
                h.AssertPaymentStatusFromStream(stream, status)

        case <-timer:
                require.Fail(h, "timeout", "waiting payment results timeout")
        }
}

// CompletePaymentRequests sends payments from a node to complete all payment
// requests. This function does not return until all payments successfully
// complete without errors.
func (h *HarnessTest) CompletePaymentRequests(hn *node.HarnessNode,
        paymentRequests []string, opts ...HarnessOpt) {

        h.completePaymentRequestsAssertStatus(
                hn, paymentRequests, lnrpc.Payment_SUCCEEDED, opts...,
        )
}

// CompletePaymentRequestsNoWait sends payments from a node to complete all
// payment requests without waiting for the results. Instead, it checks the
// number of updates in the specified channel has increased.
func (h *HarnessTest) CompletePaymentRequestsNoWait(hn *node.HarnessNode,
        paymentRequests []string, chanPoint *lnrpc.ChannelPoint) {

        // We start by getting the current state of the client's channels. This
        // is needed to ensure the payments actually have been committed before
        // we return.
        oldResp := h.GetChannelByChanPoint(hn, chanPoint)

        // Send payments and assert they are in-flight.
        h.completePaymentRequestsAssertStatus(
                hn, paymentRequests, lnrpc.Payment_IN_FLIGHT,
        )

        // We are not waiting for feedback in the form of a response, but we
        // should still wait long enough for the server to receive and handle
        // the send before cancelling the request. We wait for the number of
        // updates to one of our channels has increased before we return.
        err := wait.NoError(func() error {
                newResp := h.GetChannelByChanPoint(hn, chanPoint)

                // If this channel has an increased number of updates, we
                // assume the payments are committed, and we can return.
                if newResp.NumUpdates > oldResp.NumUpdates {
                        return nil
                }

                // Otherwise return an error as the NumUpdates are not
                // increased.
                return fmt.Errorf("%s: channel:%v not updated after sending "+
                        "payments, old updates: %v, new updates: %v", hn.Name(),
                        chanPoint, oldResp.NumUpdates, newResp.NumUpdates)
        }, DefaultTimeout)
        require.NoError(h, err, "timeout while checking for channel updates")
}

// OpenChannelPsbt attempts to open a channel between srcNode and destNode with
// the passed channel funding parameters. It will assert if the expected step
// of funding the PSBT is not received from the source node.
func (h *HarnessTest) OpenChannelPsbt(srcNode, destNode *node.HarnessNode,
        p OpenChannelParams) (rpc.OpenChanClient, []byte) {

        // Wait until srcNode and destNode have the latest chain synced.
        // Otherwise, we may run into a check within the funding manager that
        // prevents any funding workflows from being kicked off if the chain
        // isn't yet synced.
        h.WaitForBlockchainSync(srcNode)
        h.WaitForBlockchainSync(destNode)

        // Send the request to open a channel to the source node now. This will
        // open a long-lived stream where we'll receive status updates about
        // the progress of the channel.
        // respStream := h.OpenChannelStreamAndAssert(srcNode, destNode, p)
        req := &lnrpc.OpenChannelRequest{
                NodePubkey:         destNode.PubKey[:],
                LocalFundingAmount: int64(p.Amt),
                PushSat:            int64(p.PushAmt),
                Private:            p.Private,
                SpendUnconfirmed:   p.SpendUnconfirmed,
                MinHtlcMsat:        int64(p.MinHtlc),
                FundingShim:        p.FundingShim,
                CommitmentType:     p.CommitmentType,
        }
        respStream := srcNode.RPC.OpenChannel(req)

        // Consume the "PSBT funding ready" update. This waits until the node
        // notifies us that the PSBT can now be funded.
        resp := h.ReceiveOpenChannelUpdate(respStream)
        upd, ok := resp.Update.(*lnrpc.OpenStatusUpdate_PsbtFund)
        require.Truef(h, ok, "expected PSBT funding update, got %v", resp)

        // Make sure the channel funding address has the correct type for the
        // given commitment type.
        fundingAddr, err := btcutil.DecodeAddress(
                upd.PsbtFund.FundingAddress, miner.HarnessNetParams,
        )
        require.NoError(h, err)

        switch p.CommitmentType {
        case lnrpc.CommitmentType_SIMPLE_TAPROOT:
                require.IsType(h, &btcutil.AddressTaproot{}, fundingAddr)

        default:
                require.IsType(
                        h, &btcutil.AddressWitnessScriptHash{}, fundingAddr,
                )
        }

        return respStream, upd.PsbtFund.Psbt
}

// CleanupForceClose mines blocks to clean up the force close process. This is
// used for tests that are not asserting the expected behavior is found during
// the force close process, e.g., num of sweeps, etc. Instead, it provides a
// shortcut to move the test forward with a clean mempool.
func (h *HarnessTest) CleanupForceClose(hn *node.HarnessNode) {
        // Wait for the channel to be marked pending force close.
        h.AssertNumPendingForceClose(hn, 1)

        // Mine enough blocks for the node to sweep its funds from the force
        // closed channel. The commit sweep resolver is offers the input to the
        // sweeper when it's force closed, and broadcast the sweep tx at
        // defaulCSV-1.
        //
        // NOTE: we might empty blocks here as we don't know the exact number
        // of blocks to mine. This may end up mining more blocks than needed.
        h.MineEmptyBlocks(node.DefaultCSV - 1)

        // Assert there is one pending sweep.
        h.AssertNumPendingSweeps(hn, 1)

        // The node should now sweep the funds, clean up by mining the sweeping
        // tx.
        h.MineBlocksAndAssertNumTxes(1, 1)

        // Mine blocks to get any second level HTLC resolved. If there are no
        // HTLCs, this will behave like h.AssertNumPendingCloseChannels.
        h.mineTillForceCloseResolved(hn)
}

// CreatePayReqs is a helper method that will create a slice of payment
// requests for the given node.
func (h *HarnessTest) CreatePayReqs(hn *node.HarnessNode,
        paymentAmt btcutil.Amount, numInvoices int,
        routeHints ...*lnrpc.RouteHint) ([]string, [][]byte, []*lnrpc.Invoice) {

        payReqs := make([]string, numInvoices)
        rHashes := make([][]byte, numInvoices)
        invoices := make([]*lnrpc.Invoice, numInvoices)
        for i := 0; i < numInvoices; i++ {
                preimage := h.Random32Bytes()

                invoice := &lnrpc.Invoice{
                        Memo:       "testing",
                        RPreimage:  preimage,
                        Value:      int64(paymentAmt),
                        RouteHints: routeHints,
                }
                resp := hn.RPC.AddInvoice(invoice)

                // Set the payment address in the invoice so the caller can
                // properly use it.
                invoice.PaymentAddr = resp.PaymentAddr

                payReqs[i] = resp.PaymentRequest
                rHashes[i] = resp.RHash
                invoices[i] = invoice
        }

        return payReqs, rHashes, invoices
}

// BackupDB creates a backup of the current database. It will stop the node
// first, copy the database files, and restart the node.
func (h *HarnessTest) BackupDB(hn *node.HarnessNode) {
        restart := h.SuspendNode(hn)

        err := hn.BackupDB()
        require.NoErrorf(h, err, "%s: failed to backup db", hn.Name())

        err = restart()
        require.NoErrorf(h, err, "%s: failed to restart", hn.Name())
}

// RestartNodeAndRestoreDB restarts a given node with a callback to restore the
// db.
func (h *HarnessTest) RestartNodeAndRestoreDB(hn *node.HarnessNode) {
        cb := func() error { return hn.RestoreDB() }
        err := h.manager.restartNode(h.runCtx, hn, cb)
        require.NoErrorf(h, err, "failed to restart node %s", hn.Name())

        err = h.manager.unlockNode(hn)
        require.NoErrorf(h, err, "failed to unlock node %s", hn.Name())

        // Give the node some time to catch up with the chain before we
        // continue with the tests.
        h.WaitForBlockchainSync(hn)
}

// CleanShutDown is used to quickly end a test by shutting down all non-standby
// nodes and mining blocks to empty the mempool.
//
// NOTE: this method provides a faster exit for a test that involves force
// closures as the caller doesn't need to mine all the blocks to make sure the
// mempool is empty.
func (h *HarnessTest) CleanShutDown() {
        // First, shutdown all nodes to prevent new transactions being created
        // and fed into the mempool.
        h.shutdownAllNodes()

        // Now mine blocks till the mempool is empty.
        h.cleanMempool()
}

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

        channel, err := h.findChannel(hn, chanPoint, opts...)
        require.NoError(h, err, "failed to query channel")

        return channel
}

// SendPaymentAndAssertStatus sends a payment from the passed node and asserts
// the desired status is reached.
func (h *HarnessTest) SendPaymentAndAssertStatus(hn *node.HarnessNode,
        req *routerrpc.SendPaymentRequest,
        status lnrpc.Payment_PaymentStatus) *lnrpc.Payment {

        stream := hn.RPC.SendPayment(req)
        return h.AssertPaymentStatusFromStream(stream, status)
}

// SendPaymentAssertFail sends a payment from the passed node and asserts the
// payment is failed with the specified failure reason .
func (h *HarnessTest) SendPaymentAssertFail(hn *node.HarnessNode,
        req *routerrpc.SendPaymentRequest,
        reason lnrpc.PaymentFailureReason) *lnrpc.Payment {

        payment := h.SendPaymentAndAssertStatus(hn, req, lnrpc.Payment_FAILED)
        require.Equal(h, reason, payment.FailureReason,
                "payment failureReason not matched")

        return payment
}

// SendPaymentAssertSettled sends a payment from the passed node and asserts the
// payment is settled.
func (h *HarnessTest) SendPaymentAssertSettled(hn *node.HarnessNode,
        req *routerrpc.SendPaymentRequest) *lnrpc.Payment {

        return h.SendPaymentAndAssertStatus(hn, req, lnrpc.Payment_SUCCEEDED)
}

// SendPaymentAssertInflight sends a payment from the passed node and asserts
// the payment is inflight.
func (h *HarnessTest) SendPaymentAssertInflight(hn *node.HarnessNode,
        req *routerrpc.SendPaymentRequest) *lnrpc.Payment {

        return h.SendPaymentAndAssertStatus(hn, req, lnrpc.Payment_IN_FLIGHT)
}

// OpenChannelRequest is used to open a channel using the method
// OpenMultiChannelsAsync.
type OpenChannelRequest struct {
        // Local is the funding node.
        Local *node.HarnessNode

        // Remote is the receiving node.
        Remote *node.HarnessNode

        // Param is the open channel params.
        Param OpenChannelParams

        // stream is the client created after calling OpenChannel RPC.
        stream rpc.OpenChanClient

        // result is a channel used to send the channel point once the funding
        // has succeeded.
        result chan *lnrpc.ChannelPoint
}

// OpenMultiChannelsAsync takes a list of OpenChannelRequest and opens them in
// batch. The channel points are returned in same the order of the requests
// once all of the channel open succeeded.
//
// NOTE: compared to open multiple channel sequentially, this method will be
// faster as it doesn't need to mine 6 blocks for each channel open. However,
// it does make debugging the logs more difficult as messages are intertwined.
func (h *HarnessTest) OpenMultiChannelsAsync(
        reqs []*OpenChannelRequest) []*lnrpc.ChannelPoint {

        // openChannel opens a channel based on the request.
        openChannel := func(req *OpenChannelRequest) {
                stream := h.OpenChannelAssertStream(
                        req.Local, req.Remote, req.Param,
                )
                req.stream = stream
        }

        // assertChannelOpen is a helper closure that asserts a channel is
        // open.
        assertChannelOpen := func(req *OpenChannelRequest) {
                // Wait for the channel open event from the stream.
                cp := h.WaitForChannelOpenEvent(req.stream)

                if !req.Param.Private {
                        // Check that both alice and bob have seen the channel
                        // from their channel watch request.
                        h.AssertChannelInGraph(req.Local, cp)
                        h.AssertChannelInGraph(req.Remote, cp)
                }

                // Finally, check that the channel can be seen in their
                // ListChannels.
                h.AssertChannelExists(req.Local, cp)
                h.AssertChannelExists(req.Remote, cp)

                req.result <- cp
        }

        // Go through the requests and make the OpenChannel RPC call.
        for _, r := range reqs {
                openChannel(r)
        }

        // Mine one block to confirm all the funding transactions.
        h.MineBlocksAndAssertNumTxes(1, len(reqs))

        // Mine 5 more blocks so all the public channels are announced to the
        // network.
        h.MineBlocks(numBlocksOpenChannel - 1)

        // Once the blocks are mined, we fire goroutines for each of the
        // request to watch for the channel openning.
        for _, r := range reqs {
                r.result = make(chan *lnrpc.ChannelPoint, 1)
                go assertChannelOpen(r)
        }

        // Finally, collect the results.
        channelPoints := make([]*lnrpc.ChannelPoint, 0)
        for _, r := range reqs {
                select {
                case cp := <-r.result:
                        channelPoints = append(channelPoints, cp)

                case <-time.After(wait.ChannelOpenTimeout):
                        require.Failf(h, "timeout", "wait channel point "+
                                "timeout for channel %s=>%s", r.Local.Name(),
                                r.Remote.Name())
                }
        }

        // Assert that we have the expected num of channel points.
        require.Len(h, channelPoints, len(reqs),
                "returned channel points not match")

        return channelPoints
}

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

        chanMsg := make(chan *lnrpc.Invoice)
        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 invoice update")

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

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// CalculateTxFee retrieves parent transactions and reconstructs the fee paid.
func (h *HarnessTest) CalculateTxFee(tx *wire.MsgTx) btcutil.Amount {
        var balance btcutil.Amount
        for _, in := range tx.TxIn {
                parentHash := in.PreviousOutPoint.Hash
                rawTx := h.miner.GetRawTransaction(parentHash)
                parent := rawTx.MsgTx()
                value := parent.TxOut[in.PreviousOutPoint.Index].Value

                balance += btcutil.Amount(value)
        }

        for _, out := range tx.TxOut {
                balance -= btcutil.Amount(out.Value)
        }

        return balance
}

// CalculateTxWeight calculates the weight for a given tx.
//
// TODO(yy): use weight estimator to get more accurate result.
func (h *HarnessTest) CalculateTxWeight(tx *wire.MsgTx) lntypes.WeightUnit {
        utx := btcutil.NewTx(tx)
        return lntypes.WeightUnit(blockchain.GetTransactionWeight(utx))
}

// CalculateTxFeeRate calculates the fee rate for a given tx.
func (h *HarnessTest) CalculateTxFeeRate(
        tx *wire.MsgTx) chainfee.SatPerKWeight {

        w := h.CalculateTxWeight(tx)
        fee := h.CalculateTxFee(tx)

        return chainfee.NewSatPerKWeight(fee, w)
}

// CalculateTxesFeeRate takes a list of transactions and estimates the fee rate
// used to sweep them.
//
// NOTE: only used in current test file.
func (h *HarnessTest) CalculateTxesFeeRate(txns []*wire.MsgTx) int64 {
        const scale = 1000

        var totalWeight, totalFee int64
        for _, tx := range txns {
                utx := btcutil.NewTx(tx)
                totalWeight += blockchain.GetTransactionWeight(utx)

                fee := h.CalculateTxFee(tx)
                totalFee += int64(fee)
        }
        feeRate := totalFee * scale / totalWeight

        return feeRate
}

// AssertSweepFound looks up a sweep in a nodes list of broadcast sweeps and
// asserts it's found.
//
// NOTE: Does not account for node's internal state.
func (h *HarnessTest) AssertSweepFound(hn *node.HarnessNode,
        sweep string, verbose bool, startHeight int32) {

        err := wait.NoError(func() error {
                // List all sweeps that alice's node had broadcast.
                sweepResp := hn.RPC.ListSweeps(verbose, startHeight)

                var found bool
                if verbose {
                        found = findSweepInDetails(h, sweep, sweepResp)
                } else {
                        found = findSweepInTxids(h, sweep, sweepResp)
                }

                if found {
                        return nil
                }

                return fmt.Errorf("sweep tx %v not found in resp %v", sweep,
                        sweepResp)
        }, wait.DefaultTimeout)
        require.NoError(h, err, "%s: timeout checking sweep tx", hn.Name())
}

func findSweepInTxids(ht *HarnessTest, sweepTxid string,
        sweepResp *walletrpc.ListSweepsResponse) bool {

        sweepTxIDs := sweepResp.GetTransactionIds()
        require.NotNil(ht, sweepTxIDs, "expected transaction ids")
        require.Nil(ht, sweepResp.GetTransactionDetails())

        // Check that the sweep tx we have just produced is present.
        for _, tx := range sweepTxIDs.TransactionIds {
                if tx == sweepTxid {
                        return true
                }
        }

        return false
}

func findSweepInDetails(ht *HarnessTest, sweepTxid string,
        sweepResp *walletrpc.ListSweepsResponse) bool {

        sweepDetails := sweepResp.GetTransactionDetails()
        require.NotNil(ht, sweepDetails, "expected transaction details")
        require.Nil(ht, sweepResp.GetTransactionIds())

        for _, tx := range sweepDetails.Transactions {
                if tx.TxHash == sweepTxid {
                        return true
                }
        }

        return false
}

// QueryRoutesAndRetry attempts to keep querying a route until timeout is
// reached.
//
// NOTE: when a channel is opened, we may need to query multiple times to get
// it in our QueryRoutes RPC. This happens even after we check the channel is
// heard by the node using ht.AssertChannelOpen. Deep down, this is because our
// GraphTopologySubscription and QueryRoutes give different results regarding a
// specific channel, with the formal reporting it being open while the latter
// not, resulting GraphTopologySubscription acting "faster" than QueryRoutes.
// TODO(yy): make sure related subsystems share the same view on a given
// channel.
func (h *HarnessTest) QueryRoutesAndRetry(hn *node.HarnessNode,
        req *lnrpc.QueryRoutesRequest) *lnrpc.QueryRoutesResponse {

        var routes *lnrpc.QueryRoutesResponse
        err := wait.NoError(func() error {
                ctxt, cancel := context.WithCancel(h.runCtx)
                defer cancel()

                resp, err := hn.RPC.LN.QueryRoutes(ctxt, req)
                if err != nil {
                        return fmt.Errorf("%s: failed to query route: %w",
                                hn.Name(), err)
                }

                routes = resp

                return nil
        }, DefaultTimeout)

        require.NoError(h, err, "timeout querying routes")

        return routes
}

// ReceiveHtlcInterceptor waits until a message is received on the htlc
// interceptor stream or the timeout is reached.
func (h *HarnessTest) ReceiveHtlcInterceptor(
        stream rpc.InterceptorClient) *routerrpc.ForwardHtlcInterceptRequest {

        chanMsg := make(chan *routerrpc.ForwardHtlcInterceptRequest)
        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 intercepting htlc")

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

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// ReceiveInvoiceHtlcModification waits until a message is received on the
// invoice HTLC modifier stream or the timeout is reached.
func (h *HarnessTest) ReceiveInvoiceHtlcModification(
        stream rpc.InvoiceHtlcModifierClient) *invoicesrpc.HtlcModifyRequest {

        chanMsg := make(chan *invoicesrpc.HtlcModifyRequest)
        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 invoice HTLC modifier")

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

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// ReceiveChannelEvent waits until a message is received from the
// ChannelEventsClient stream or the timeout is reached.
func (h *HarnessTest) ReceiveChannelEvent(
        stream rpc.ChannelEventsClient) *lnrpc.ChannelEventUpdate {

        chanMsg := make(chan *lnrpc.ChannelEventUpdate)
        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 intercepting htlc")

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

        case updateMsg := <-chanMsg:
                return updateMsg
        }

        return nil
}

// GetOutputIndex returns the output index of the given address in the given
// transaction.
func (h *HarnessTest) GetOutputIndex(txid chainhash.Hash, addr string) int {
        // We'll then extract the raw transaction from the mempool in order to
        // determine the index of the p2tr output.
        tx := h.miner.GetRawTransaction(txid)

        p2trOutputIndex := -1
        for i, txOut := range tx.MsgTx().TxOut {
                _, addrs, _, err := txscript.ExtractPkScriptAddrs(
                        txOut.PkScript, h.miner.ActiveNet,
                )
                require.NoError(h, err)

                if addrs[0].String() == addr {
                        p2trOutputIndex = i
                }
        }
        require.Greater(h, p2trOutputIndex, -1)

        return p2trOutputIndex
}

// SendCoins sends a coin from node A to node B with the given amount, returns
// the sending tx.
func (h *HarnessTest) SendCoins(a, b *node.HarnessNode,
        amt btcutil.Amount) *wire.MsgTx {

        // Create an address for Bob receive the coins.
        req := &lnrpc.NewAddressRequest{
                Type: lnrpc.AddressType_TAPROOT_PUBKEY,
        }
        resp := b.RPC.NewAddress(req)

        // Send the coins from Alice to Bob. We should expect a tx to be
        // broadcast and seen in the mempool.
        sendReq := &lnrpc.SendCoinsRequest{
                Addr:       resp.Address,
                Amount:     int64(amt),
                TargetConf: 6,
        }
        a.RPC.SendCoins(sendReq)
        tx := h.GetNumTxsFromMempool(1)[0]

        return tx
}

// CreateSimpleNetwork creates the number of nodes specified by the number of
// configs and makes a topology of `node1 -> node2 -> node3...`. Each node is
// created using the specified config, the neighbors are connected, and the
// channels are opened. Each node will be funded with a single UTXO of 1 BTC
// except the last one.
//
// For instance, to create a network with 2 nodes that share the same node
// config,
//
//        cfg := []string{"--protocol.anchors"}
//        cfgs := [][]string{cfg, cfg}
//        params := OpenChannelParams{...}
//        chanPoints, nodes := ht.CreateSimpleNetwork(cfgs, params)
//
// This will create two nodes and open an anchor channel between them.
func (h *HarnessTest) CreateSimpleNetwork(nodeCfgs [][]string,
        p OpenChannelParams) ([]*lnrpc.ChannelPoint, []*node.HarnessNode) {

        // Create new nodes.
        nodes := h.createNodes(nodeCfgs)

        var resp []*lnrpc.ChannelPoint

        // Open zero-conf channels if specified.
        if p.ZeroConf {
                resp = h.openZeroConfChannelsForNodes(nodes, p)
        } else {
                // Open channels between the nodes.
                resp = h.openChannelsForNodes(nodes, p)
        }

        return resp, nodes
}

// acceptChannel is used to accept a single channel that comes across. This
// should be run in a goroutine and is used to test nodes with the zero-conf
// feature bit.
func acceptChannel(t *testing.T, zeroConf bool, stream rpc.AcceptorClient) {
        req, err := stream.Recv()
        require.NoError(t, err)

        resp := &lnrpc.ChannelAcceptResponse{
                Accept:        true,
                PendingChanId: req.PendingChanId,
                ZeroConf:      zeroConf,
        }
        err = stream.Send(resp)
        require.NoError(t, err)
}

// nodeNames defines a slice of human-reable names for the nodes created in the
// `createNodes` method. 8 nodes are defined here as by default we can only
// create this many nodes in one test.
var nodeNames = []string{
        "Alice", "Bob", "Carol", "Dave", "Eve", "Frank", "Grace", "Heidi",
}

// createNodes creates the number of nodes specified by the number of configs.
// Each node is created using the specified config, the neighbors are
// connected.
func (h *HarnessTest) createNodes(nodeCfgs [][]string) []*node.HarnessNode {
        // Get the number of nodes.
        numNodes := len(nodeCfgs)

        // Make sure we are creating a reasonable number of nodes.
        require.LessOrEqual(h, numNodes, len(nodeNames), "too many nodes")

        // Make a slice of nodes.
        nodes := make([]*node.HarnessNode, numNodes)

        // Create new nodes.
        for i, nodeCfg := range nodeCfgs {
                nodeName := nodeNames[i]
                n := h.NewNode(nodeName, nodeCfg)
                nodes[i] = n
        }

        // Connect the nodes in a chain.
        for i := 1; i < len(nodes); i++ {
                nodeA := nodes[i-1]
                nodeB := nodes[i]
                h.EnsureConnected(nodeA, nodeB)
        }

        // Fund all the nodes expect the last one.
        for i := 0; i < len(nodes)-1; i++ {
                node := nodes[i]
                h.FundCoinsUnconfirmed(btcutil.SatoshiPerBitcoin, node)
        }

        // Mine 1 block to get the above coins confirmed.
        h.MineBlocksAndAssertNumTxes(1, numNodes-1)

        return nodes
}

// openChannelsForNodes takes a list of nodes and makes a topology of `node1 ->
// node2 -> node3...`.
func (h *HarnessTest) openChannelsForNodes(nodes []*node.HarnessNode,
        p OpenChannelParams) []*lnrpc.ChannelPoint {

        // Sanity check the params.
        require.Greater(h, len(nodes), 1, "need at least 2 nodes")

        // attachFundingShim is a helper closure that optionally attaches a
        // funding shim to the open channel params and returns it.
        attachFundingShim := func(
                nodeA, nodeB *node.HarnessNode) OpenChannelParams {

                // If this channel is not a script enforced lease channel,
                // we'll do nothing and return the params.
                leasedType := lnrpc.CommitmentType_SCRIPT_ENFORCED_LEASE
                if p.CommitmentType != leasedType {
                        return p
                }

                // Otherwise derive the funding shim, attach it to the original
                // open channel params and return it.
                minerHeight := h.CurrentHeight()
                thawHeight := minerHeight + thawHeightDelta
                fundingShim, _ := h.deriveFundingShim(
                        nodeA, nodeB, p.Amt, thawHeight, true, leasedType,
                )

                p.FundingShim = fundingShim

                return p
        }

        // Open channels in batch to save blocks mined.
        reqs := make([]*OpenChannelRequest, 0, len(nodes)-1)
        for i := 0; i < len(nodes)-1; i++ {
                nodeA := nodes[i]
                nodeB := nodes[i+1]

                // Optionally attach a funding shim to the open channel params.
                p = attachFundingShim(nodeA, nodeB)

                req := &OpenChannelRequest{
                        Local:  nodeA,
                        Remote: nodeB,
                        Param:  p,
                }
                reqs = append(reqs, req)
        }
        resp := h.OpenMultiChannelsAsync(reqs)

        // If the channels are private, make sure the channel participants know
        // the relevant channel.
        if p.Private {
                for i, chanPoint := range resp {
                        // Get the channel participants - for n channels we
                        // would have n+1 nodes.
                        nodeA, nodeB := nodes[i], nodes[i+1]
                        h.AssertChannelInGraph(nodeA, chanPoint)
                        h.AssertChannelInGraph(nodeB, chanPoint)
                }
        } else {
                // Make sure the all nodes know all the channels if they are
                // public.
                for _, node := range nodes {
                        for _, chanPoint := range resp {
                                h.AssertChannelInGraph(node, chanPoint)
                        }

                        // Make sure every node has updated its cached graph
                        // about the edges as indicated in `DescribeGraph`.
                        h.AssertNumEdges(node, len(resp), false)
                }
        }

        return resp
}

// openZeroConfChannelsForNodes takes a list of nodes and makes a topology of
// `node1 -> node2 -> node3...` with zero-conf channels.
func (h *HarnessTest) openZeroConfChannelsForNodes(nodes []*node.HarnessNode,
        p OpenChannelParams) []*lnrpc.ChannelPoint {

        // Sanity check the params.
        require.True(h, p.ZeroConf, "zero-conf channels must be enabled")
        require.Greater(h, len(nodes), 1, "need at least 2 nodes")

        // We are opening numNodes-1 channels.
        cancels := make([]context.CancelFunc, 0, len(nodes)-1)

        // Create the channel acceptors.
        for _, node := range nodes[1:] {
                acceptor, cancel := node.RPC.ChannelAcceptor()
                go acceptChannel(h.T, true, acceptor)

                cancels = append(cancels, cancel)
        }

        // Open channels between the nodes.
        resp := h.openChannelsForNodes(nodes, p)

        for _, cancel := range cancels {
                cancel()
        }

        return resp
}

// deriveFundingShim creates a channel funding shim by deriving the necessary
// keys on both sides.
func (h *HarnessTest) deriveFundingShim(alice, bob *node.HarnessNode,
        chanSize btcutil.Amount, thawHeight uint32, publish bool,
        commitType lnrpc.CommitmentType) (*lnrpc.FundingShim,
        *lnrpc.ChannelPoint) {

        keyLoc := &signrpc.KeyLocator{KeyFamily: 9999}
        carolFundingKey := alice.RPC.DeriveKey(keyLoc)
        daveFundingKey := bob.RPC.DeriveKey(keyLoc)

        // Now that we have the multi-sig keys for each party, we can manually
        // construct the funding transaction. We'll instruct the backend to
        // immediately create and broadcast a transaction paying out an exact
        // amount. Normally this would reside in the mempool, but we just
        // confirm it now for simplicity.
        var (
                fundingOutput *wire.TxOut
                musig2        bool
                err           error
        )
        if commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
                var carolKey, daveKey *btcec.PublicKey
                carolKey, err = btcec.ParsePubKey(carolFundingKey.RawKeyBytes)
                require.NoError(h, err)
                daveKey, err = btcec.ParsePubKey(daveFundingKey.RawKeyBytes)
                require.NoError(h, err)

                _, fundingOutput, err = input.GenTaprootFundingScript(
                        carolKey, daveKey, int64(chanSize),
                        fn.None[chainhash.Hash](),
                )
                require.NoError(h, err)

                musig2 = true
        } else {
                _, fundingOutput, err = input.GenFundingPkScript(
                        carolFundingKey.RawKeyBytes, daveFundingKey.RawKeyBytes,
                        int64(chanSize),
                )
                require.NoError(h, err)
        }

        var txid *chainhash.Hash
        targetOutputs := []*wire.TxOut{fundingOutput}
        if publish {
                txid = h.SendOutputsWithoutChange(targetOutputs, 5)
        } else {
                tx := h.CreateTransaction(targetOutputs, 5)

                txHash := tx.TxHash()
                txid = &txHash
        }

        // At this point, we can being our external channel funding workflow.
        // We'll start by generating a pending channel ID externally that will
        // be used to track this new funding type.
        pendingChanID := h.Random32Bytes()

        // Now that we have the pending channel ID, Dave (our responder) will
        // register the intent to receive a new channel funding workflow using
        // the pending channel ID.
        chanPoint := &lnrpc.ChannelPoint{
                FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{
                        FundingTxidBytes: txid[:],
                },
        }
        chanPointShim := &lnrpc.ChanPointShim{
                Amt:       int64(chanSize),
                ChanPoint: chanPoint,
                LocalKey: &lnrpc.KeyDescriptor{
                        RawKeyBytes: daveFundingKey.RawKeyBytes,
                        KeyLoc: &lnrpc.KeyLocator{
                                KeyFamily: daveFundingKey.KeyLoc.KeyFamily,
                                KeyIndex:  daveFundingKey.KeyLoc.KeyIndex,
                        },
                },
                RemoteKey:     carolFundingKey.RawKeyBytes,
                PendingChanId: pendingChanID,
                ThawHeight:    thawHeight,
                Musig2:        musig2,
        }
        fundingShim := &lnrpc.FundingShim{
                Shim: &lnrpc.FundingShim_ChanPointShim{
                        ChanPointShim: chanPointShim,
                },
        }
        bob.RPC.FundingStateStep(&lnrpc.FundingTransitionMsg{
                Trigger: &lnrpc.FundingTransitionMsg_ShimRegister{
                        ShimRegister: fundingShim,
                },
        })

        // If we attempt to register the same shim (has the same pending chan
        // ID), then we should get an error.
        bob.RPC.FundingStateStepAssertErr(&lnrpc.FundingTransitionMsg{
                Trigger: &lnrpc.FundingTransitionMsg_ShimRegister{
                        ShimRegister: fundingShim,
                },
        })

        // We'll take the chan point shim we just registered for Dave (the
        // responder), and swap the local/remote keys before we feed it in as
        // Carol's funding shim as the initiator.
        fundingShim.GetChanPointShim().LocalKey = &lnrpc.KeyDescriptor{
                RawKeyBytes: carolFundingKey.RawKeyBytes,
                KeyLoc: &lnrpc.KeyLocator{
                        KeyFamily: carolFundingKey.KeyLoc.KeyFamily,
                        KeyIndex:  carolFundingKey.KeyLoc.KeyIndex,
                },
        }
        fundingShim.GetChanPointShim().RemoteKey = daveFundingKey.RawKeyBytes

        return fundingShim, chanPoint
}

lightningnetwork / lnd / 12209990843

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