lnd.xprv/lntest/node.go
Matheus Degiovani e98a92233f lntest: Use TCP ports not based in nodeID
This changes TCP port selection in integration tests from being
sequential, based on the node ID to being sequential but tested before
assigment.

This should reduce the number of flaky tests that fail due to the port
already being used by another process in the CI server.
2019-12-03 16:12:14 -03:00

1142 lines
33 KiB
Go

package lntest
import (
"bytes"
"context"
"encoding/hex"
"flag"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"os/exec"
"path/filepath"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/chanbackup"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
"github.com/lightningnetwork/lnd/lnrpc/watchtowerrpc"
"github.com/lightningnetwork/lnd/lnrpc/wtclientrpc"
"github.com/lightningnetwork/lnd/lntest/wait"
"github.com/lightningnetwork/lnd/macaroons"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"gopkg.in/macaroon.v2"
)
const (
// defaultNodePort is the start of the range for listening ports of
// harness nodes. Ports are monotonically increasing starting from this
// number and are determined by the results of nextAvailablePort().
defaultNodePort = 19555
// logPubKeyBytes is the number of bytes of the node's PubKey that will
// be appended to the log file name. The whole PubKey is too long and
// not really necessary to quickly identify what node produced which
// log file.
logPubKeyBytes = 4
// trickleDelay is the amount of time in milliseconds between each
// release of announcements by AuthenticatedGossiper to the network.
trickleDelay = 50
)
var (
// numActiveNodes is the number of active nodes within the test network.
numActiveNodes = 0
numActiveNodesMtx sync.Mutex
// lastPort is the last port determined to be free for use by a new
// node. It should be used atomically.
lastPort uint32 = defaultNodePort
// logOutput is a flag that can be set to append the output from the
// seed nodes to log files.
logOutput = flag.Bool("logoutput", false,
"log output from node n to file output-n.log")
// goroutineDump is a flag that can be set to dump the active
// goroutines of test nodes on failure.
goroutineDump = flag.Bool("goroutinedump", false,
"write goroutine dump from node n to file pprof-n.log")
)
// nextAvailablePort returns the first port that is available for listening by
// a new node. It panics if no port is found and the maximum available TCP port
// is reached.
func nextAvailablePort() int {
port := atomic.AddUint32(&lastPort, 1)
for port < 65535 {
// If there are no errors while attempting to listen on this
// port, close the socket and return it as available. While it
// could be the case that some other process picks up this port
// between the time the socket is closed and it's reopened in
// the harness node, in practice in CI servers this seems much
// less likely than simply some other process already being
// bound at the start of the tests.
addr := fmt.Sprintf("127.0.0.1:%d", port)
l, err := net.Listen("tcp4", addr)
if err == nil {
err := l.Close()
if err == nil {
return int(port)
}
}
port = atomic.AddUint32(&lastPort, 1)
}
// No ports available? Must be a mistake.
panic("no ports available for listening")
}
// generateListeningPorts returns four ints representing ports to listen on
// designated for the current lightning network test. This returns the next
// available ports for the p2p, rpc, rest and profiling services.
func generateListeningPorts() (int, int, int, int) {
p2p := nextAvailablePort()
rpc := nextAvailablePort()
rest := nextAvailablePort()
profile := nextAvailablePort()
return p2p, rpc, rest, profile
}
// BackendConfig is an interface that abstracts away the specific chain backend
// node implementation.
type BackendConfig interface {
// GenArgs returns the arguments needed to be passed to LND at startup
// for using this node as a chain backend.
GenArgs() []string
// ConnectMiner is called to establish a connection to the test miner.
ConnectMiner() error
// DisconnectMiner is called to bitconneeeect the miner.
DisconnectMiner() error
// Name returns the name of the backend type.
Name() string
}
type nodeConfig struct {
Name string
BackendCfg BackendConfig
NetParams *chaincfg.Params
BaseDir string
ExtraArgs []string
DataDir string
LogDir string
TLSCertPath string
TLSKeyPath string
AdminMacPath string
ReadMacPath string
InvoiceMacPath string
HasSeed bool
Password []byte
P2PPort int
RPCPort int
RESTPort int
ProfilePort int
}
func (cfg nodeConfig) P2PAddr() string {
return net.JoinHostPort("127.0.0.1", strconv.Itoa(cfg.P2PPort))
}
func (cfg nodeConfig) RPCAddr() string {
return net.JoinHostPort("127.0.0.1", strconv.Itoa(cfg.RPCPort))
}
func (cfg nodeConfig) RESTAddr() string {
return net.JoinHostPort("127.0.0.1", strconv.Itoa(cfg.RESTPort))
}
func (cfg nodeConfig) DBPath() string {
return filepath.Join(cfg.DataDir, "graph",
fmt.Sprintf("%v/channel.db", cfg.NetParams.Name))
}
func (cfg nodeConfig) ChanBackupPath() string {
return filepath.Join(
cfg.DataDir, "chain", "bitcoin",
fmt.Sprintf(
"%v/%v", cfg.NetParams.Name,
chanbackup.DefaultBackupFileName,
),
)
}
// genArgs generates a slice of command line arguments from the lightning node
// config struct.
func (cfg nodeConfig) genArgs() []string {
var args []string
switch cfg.NetParams {
case &chaincfg.TestNet3Params:
args = append(args, "--bitcoin.testnet")
case &chaincfg.SimNetParams:
args = append(args, "--bitcoin.simnet")
case &chaincfg.RegressionNetParams:
args = append(args, "--bitcoin.regtest")
}
backendArgs := cfg.BackendCfg.GenArgs()
args = append(args, backendArgs...)
args = append(args, "--bitcoin.active")
args = append(args, "--nobootstrap")
args = append(args, "--debuglevel=debug")
args = append(args, "--bitcoin.defaultchanconfs=1")
args = append(args, fmt.Sprintf("--bitcoin.defaultremotedelay=%v", DefaultCSV))
args = append(args, fmt.Sprintf("--rpclisten=%v", cfg.RPCAddr()))
args = append(args, fmt.Sprintf("--restlisten=%v", cfg.RESTAddr()))
args = append(args, fmt.Sprintf("--listen=%v", cfg.P2PAddr()))
args = append(args, fmt.Sprintf("--externalip=%v", cfg.P2PAddr()))
args = append(args, fmt.Sprintf("--logdir=%v", cfg.LogDir))
args = append(args, fmt.Sprintf("--datadir=%v", cfg.DataDir))
args = append(args, fmt.Sprintf("--tlscertpath=%v", cfg.TLSCertPath))
args = append(args, fmt.Sprintf("--tlskeypath=%v", cfg.TLSKeyPath))
args = append(args, fmt.Sprintf("--configfile=%v", cfg.DataDir))
args = append(args, fmt.Sprintf("--adminmacaroonpath=%v", cfg.AdminMacPath))
args = append(args, fmt.Sprintf("--readonlymacaroonpath=%v", cfg.ReadMacPath))
args = append(args, fmt.Sprintf("--invoicemacaroonpath=%v", cfg.InvoiceMacPath))
args = append(args, fmt.Sprintf("--trickledelay=%v", trickleDelay))
args = append(args, fmt.Sprintf("--profile=%d", cfg.ProfilePort))
if !cfg.HasSeed {
args = append(args, "--noseedbackup")
}
if cfg.ExtraArgs != nil {
args = append(args, cfg.ExtraArgs...)
}
return args
}
// HarnessNode represents an instance of lnd running within our test network
// harness. Each HarnessNode instance also fully embeds an RPC client in
// order to pragmatically drive the node.
type HarnessNode struct {
cfg *nodeConfig
// NodeID is a unique identifier for the node within a NetworkHarness.
NodeID int
// PubKey is the serialized compressed identity public key of the node.
// This field will only be populated once the node itself has been
// started via the start() method.
PubKey [33]byte
PubKeyStr string
cmd *exec.Cmd
pidFile string
logFile *os.File
// processExit is a channel that's closed once it's detected that the
// process this instance of HarnessNode is bound to has exited.
processExit chan struct{}
chanWatchRequests chan *chanWatchRequest
// For each outpoint, we'll track an integer which denotes the number of
// edges seen for that channel within the network. When this number
// reaches 2, then it means that both edge advertisements has propagated
// through the network.
openChans map[wire.OutPoint]int
openClients map[wire.OutPoint][]chan struct{}
closedChans map[wire.OutPoint]struct{}
closeClients map[wire.OutPoint][]chan struct{}
quit chan struct{}
wg sync.WaitGroup
lnrpc.LightningClient
lnrpc.WalletUnlockerClient
invoicesrpc.InvoicesClient
// RouterClient, WalletKitClient, WatchtowerClient cannot be embedded,
// because a name collision would occur with LightningClient.
RouterClient routerrpc.RouterClient
WalletKitClient walletrpc.WalletKitClient
Watchtower watchtowerrpc.WatchtowerClient
WatchtowerClient wtclientrpc.WatchtowerClientClient
}
// Assert *HarnessNode implements the lnrpc.LightningClient interface.
var _ lnrpc.LightningClient = (*HarnessNode)(nil)
var _ lnrpc.WalletUnlockerClient = (*HarnessNode)(nil)
var _ invoicesrpc.InvoicesClient = (*HarnessNode)(nil)
// newNode creates a new test lightning node instance from the passed config.
func newNode(cfg nodeConfig) (*HarnessNode, error) {
if cfg.BaseDir == "" {
var err error
cfg.BaseDir, err = ioutil.TempDir("", "lndtest-node")
if err != nil {
return nil, err
}
}
cfg.DataDir = filepath.Join(cfg.BaseDir, "data")
cfg.LogDir = filepath.Join(cfg.BaseDir, "log")
cfg.TLSCertPath = filepath.Join(cfg.DataDir, "tls.cert")
cfg.TLSKeyPath = filepath.Join(cfg.DataDir, "tls.key")
cfg.AdminMacPath = filepath.Join(cfg.DataDir, "admin.macaroon")
cfg.ReadMacPath = filepath.Join(cfg.DataDir, "readonly.macaroon")
cfg.InvoiceMacPath = filepath.Join(cfg.DataDir, "invoice.macaroon")
cfg.P2PPort, cfg.RPCPort, cfg.RESTPort, cfg.ProfilePort = generateListeningPorts()
numActiveNodesMtx.Lock()
nodeNum := numActiveNodes
numActiveNodes++
numActiveNodesMtx.Unlock()
return &HarnessNode{
cfg: &cfg,
NodeID: nodeNum,
chanWatchRequests: make(chan *chanWatchRequest),
openChans: make(map[wire.OutPoint]int),
openClients: make(map[wire.OutPoint][]chan struct{}),
closedChans: make(map[wire.OutPoint]struct{}),
closeClients: make(map[wire.OutPoint][]chan struct{}),
}, nil
}
// DBPath returns the filepath to the channeldb database file for this node.
func (hn *HarnessNode) DBPath() string {
return hn.cfg.DBPath()
}
// Name returns the name of this node set during initialization.
func (hn *HarnessNode) Name() string {
return hn.cfg.Name
}
// TLSCertStr returns the path where the TLS certificate is stored.
func (hn *HarnessNode) TLSCertStr() string {
return hn.cfg.TLSCertPath
}
// TLSKeyStr returns the path where the TLS key is stored.
func (hn *HarnessNode) TLSKeyStr() string {
return hn.cfg.TLSKeyPath
}
// ChanBackupPath returns the fielpath to the on-disk channels.backup file for
// this node.
func (hn *HarnessNode) ChanBackupPath() string {
return hn.cfg.ChanBackupPath()
}
// AdminMacPath returns the filepath to the admin.macaroon file for this node.
func (hn *HarnessNode) AdminMacPath() string {
return hn.cfg.AdminMacPath
}
// ReadMacPath returns the filepath to the readonly.macaroon file for this node.
func (hn *HarnessNode) ReadMacPath() string {
return hn.cfg.ReadMacPath
}
// InvoiceMacPath returns the filepath to the invoice.macaroon file for this
// node.
func (hn *HarnessNode) InvoiceMacPath() string {
return hn.cfg.InvoiceMacPath
}
// Start launches a new process running lnd. Additionally, the PID of the
// launched process is saved in order to possibly kill the process forcibly
// later.
//
// This may not clean up properly if an error is returned, so the caller should
// call shutdown() regardless of the return value.
func (hn *HarnessNode) start(lndError chan<- error) error {
hn.quit = make(chan struct{})
args := hn.cfg.genArgs()
hn.cmd = exec.Command("../../lnd-itest", args...)
// Redirect stderr output to buffer
var errb bytes.Buffer
hn.cmd.Stderr = &errb
// Make sure the log file cleanup function is initialized, even
// if no log file is created.
var finalizeLogfile = func() {
if hn.logFile != nil {
hn.logFile.Close()
}
}
// If the logoutput flag is passed, redirect output from the nodes to
// log files.
if *logOutput {
fileName := fmt.Sprintf("output-%d-%s-%s.log", hn.NodeID,
hn.cfg.Name, hex.EncodeToString(hn.PubKey[:logPubKeyBytes]))
// If the node's PubKey is not yet initialized, create a temporary
// file name. Later, after the PubKey has been initialized, the
// file can be moved to its final name with the PubKey included.
if bytes.Equal(hn.PubKey[:4], []byte{0, 0, 0, 0}) {
fileName = fmt.Sprintf("output-%d-%s-tmp__.log", hn.NodeID,
hn.cfg.Name)
// Once the node has done its work, the log file can be renamed.
finalizeLogfile = func() {
if hn.logFile != nil {
hn.logFile.Close()
newFileName := fmt.Sprintf("output-%d-%s-%s.log",
hn.NodeID, hn.cfg.Name,
hex.EncodeToString(hn.PubKey[:logPubKeyBytes]))
err := os.Rename(fileName, newFileName)
if err != nil {
fmt.Printf("could not rename "+
"%s to %s: %v\n",
fileName, newFileName,
err)
}
}
}
}
// Create file if not exists, otherwise append.
file, err := os.OpenFile(fileName,
os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
return err
}
// Pass node's stderr to both errb and the file.
w := io.MultiWriter(&errb, file)
hn.cmd.Stderr = w
// Pass the node's stdout only to the file.
hn.cmd.Stdout = file
// Let the node keep a reference to this file, such
// that we can add to it if necessary.
hn.logFile = file
}
if err := hn.cmd.Start(); err != nil {
return err
}
// Launch a new goroutine which that bubbles up any potential fatal
// process errors to the goroutine running the tests.
hn.processExit = make(chan struct{})
hn.wg.Add(1)
go func() {
defer hn.wg.Done()
err := hn.cmd.Wait()
if err != nil {
lndError <- errors.Errorf("%v\n%v\n", err, errb.String())
}
// Signal any onlookers that this process has exited.
close(hn.processExit)
// Make sure log file is closed and renamed if necessary.
finalizeLogfile()
}()
// Write process ID to a file.
if err := hn.writePidFile(); err != nil {
hn.cmd.Process.Kill()
return err
}
// Since Stop uses the LightningClient to stop the node, if we fail to get a
// connected client, we have to kill the process.
useMacaroons := !hn.cfg.HasSeed
conn, err := hn.ConnectRPC(useMacaroons)
if err != nil {
hn.cmd.Process.Kill()
return err
}
// If the node was created with a seed, we will need to perform an
// additional step to unlock the wallet. The connection returned will
// only use the TLS certs, and can only perform operations necessary to
// unlock the daemon.
if hn.cfg.HasSeed {
hn.WalletUnlockerClient = lnrpc.NewWalletUnlockerClient(conn)
return nil
}
return hn.initLightningClient(conn)
}
// initClientWhenReady waits until the main gRPC server is detected as active,
// then complete the normal HarnessNode gRPC connection creation. This can be
// used it a node has just been unlocked, or has its wallet state initialized.
func (hn *HarnessNode) initClientWhenReady() error {
var (
conn *grpc.ClientConn
connErr error
)
if err := wait.NoError(func() error {
conn, connErr = hn.ConnectRPC(true)
return connErr
}, 5*time.Second); err != nil {
return err
}
return hn.initLightningClient(conn)
}
// Init initializes a harness node by passing the init request via rpc. After
// the request is submitted, this method will block until an
// macaroon-authenticated rpc connection can be established to the harness node.
// Once established, the new connection is used to initialize the
// LightningClient and subscribes the HarnessNode to topology changes.
func (hn *HarnessNode) Init(ctx context.Context,
initReq *lnrpc.InitWalletRequest) error {
ctxt, _ := context.WithTimeout(ctx, DefaultTimeout)
_, err := hn.InitWallet(ctxt, initReq)
if err != nil {
return err
}
// Wait for the wallet to finish unlocking, such that we can connect to
// it via a macaroon-authenticated rpc connection.
return hn.initClientWhenReady()
}
// Unlock attempts to unlock the wallet of the target HarnessNode. This method
// should be called after the restart of a HarnessNode that was created with a
// seed+password. Once this method returns, the HarnessNode will be ready to
// accept normal gRPC requests and harness command.
func (hn *HarnessNode) Unlock(ctx context.Context,
unlockReq *lnrpc.UnlockWalletRequest) error {
ctxt, _ := context.WithTimeout(ctx, DefaultTimeout)
// Otherwise, we'll need to unlock the node before it's able to start
// up properly.
if _, err := hn.UnlockWallet(ctxt, unlockReq); err != nil {
return err
}
// Now that the wallet has been unlocked, we'll wait for the RPC client
// to be ready, then establish the normal gRPC connection.
return hn.initClientWhenReady()
}
// initLightningClient constructs the grpc LightningClient from the given client
// connection and subscribes the harness node to graph topology updates.
// This method also spawns a lightning network watcher for this node,
// which watches for topology changes.
func (hn *HarnessNode) initLightningClient(conn *grpc.ClientConn) error {
// Construct the LightningClient that will allow us to use the
// HarnessNode directly for normal rpc operations.
hn.LightningClient = lnrpc.NewLightningClient(conn)
hn.InvoicesClient = invoicesrpc.NewInvoicesClient(conn)
hn.RouterClient = routerrpc.NewRouterClient(conn)
hn.WalletKitClient = walletrpc.NewWalletKitClient(conn)
hn.Watchtower = watchtowerrpc.NewWatchtowerClient(conn)
hn.WatchtowerClient = wtclientrpc.NewWatchtowerClientClient(conn)
// Set the harness node's pubkey to what the node claims in GetInfo.
err := hn.FetchNodeInfo()
if err != nil {
return err
}
// Due to a race condition between the ChannelRouter starting and us
// making the subscription request, it's possible for our graph
// subscription to fail. To ensure we don't start listening for updates
// until then, we'll create a dummy subscription to ensure we can do so
// successfully before proceeding. We use a dummy subscription in order
// to not consume an update from the real one.
err = wait.NoError(func() error {
req := &lnrpc.GraphTopologySubscription{}
ctx, cancelFunc := context.WithCancel(context.Background())
topologyClient, err := hn.SubscribeChannelGraph(ctx, req)
if err != nil {
return err
}
// We'll wait to receive an error back within a one second
// timeout. This is needed since creating the client's stream is
// independent of the graph subscription being created. The
// stream is closed from the server's side upon an error.
errChan := make(chan error, 1)
go func() {
if _, err := topologyClient.Recv(); err != nil {
errChan <- err
}
}()
select {
case err = <-errChan:
case <-time.After(time.Second):
}
cancelFunc()
return err
}, DefaultTimeout)
if err != nil {
return err
}
// Launch the watcher that will hook into graph related topology change
// from the PoV of this node.
hn.wg.Add(1)
go hn.lightningNetworkWatcher()
return nil
}
// FetchNodeInfo queries an unlocked node to retrieve its public key.
func (hn *HarnessNode) FetchNodeInfo() error {
// Obtain the lnid of this node for quick identification purposes.
ctxb := context.Background()
info, err := hn.GetInfo(ctxb, &lnrpc.GetInfoRequest{})
if err != nil {
return err
}
hn.PubKeyStr = info.IdentityPubkey
pubkey, err := hex.DecodeString(info.IdentityPubkey)
if err != nil {
return err
}
copy(hn.PubKey[:], pubkey)
return nil
}
// AddToLog adds a line of choice to the node's logfile. This is useful
// to interleave test output with output from the node.
func (hn *HarnessNode) AddToLog(line string) error {
// If this node was not set up with a log file, just return early.
if hn.logFile == nil {
return nil
}
if _, err := hn.logFile.WriteString(line); err != nil {
return err
}
return nil
}
// writePidFile writes the process ID of the running lnd process to a .pid file.
func (hn *HarnessNode) writePidFile() error {
filePath := filepath.Join(hn.cfg.BaseDir, fmt.Sprintf("%v.pid", hn.NodeID))
pid, err := os.Create(filePath)
if err != nil {
return err
}
defer pid.Close()
_, err = fmt.Fprintf(pid, "%v\n", hn.cmd.Process.Pid)
if err != nil {
return err
}
hn.pidFile = filePath
return nil
}
// ReadMacaroon waits a given duration for the macaroon file to be created. If
// the file is readable within the timeout, its content is de-serialized as a
// macaroon and returned.
func (hn *HarnessNode) ReadMacaroon(macPath string, timeout time.Duration) (
*macaroon.Macaroon, error) {
// Wait until macaroon file is created before using it.
macTimeout := time.After(timeout)
for !fileExists(macPath) {
select {
case <-macTimeout:
return nil, fmt.Errorf("timeout waiting for macaroon "+
"file %s to be created after %d seconds",
macPath, timeout/time.Second)
case <-time.After(100 * time.Millisecond):
}
}
// Now that we know the file exists, read it and return the macaroon.
macBytes, err := ioutil.ReadFile(macPath)
if err != nil {
return nil, err
}
mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
return nil, err
}
return mac, nil
}
// ConnectRPCWithMacaroon uses the TLS certificate and given macaroon to
// create a gRPC client connection.
func (hn *HarnessNode) ConnectRPCWithMacaroon(mac *macaroon.Macaroon) (
*grpc.ClientConn, error) {
// Wait until TLS certificate is created before using it, up to 30 sec.
tlsTimeout := time.After(DefaultTimeout)
for !fileExists(hn.cfg.TLSCertPath) {
select {
case <-tlsTimeout:
return nil, fmt.Errorf("timeout waiting for TLS cert " +
"file to be created")
case <-time.After(100 * time.Millisecond):
}
}
opts := []grpc.DialOption{grpc.WithBlock()}
tlsCreds, err := credentials.NewClientTLSFromFile(
hn.cfg.TLSCertPath, "",
)
if err != nil {
return nil, err
}
opts = append(opts, grpc.WithTransportCredentials(tlsCreds))
if mac == nil {
return grpc.Dial(hn.cfg.RPCAddr(), opts...)
}
macCred := macaroons.NewMacaroonCredential(mac)
opts = append(opts, grpc.WithPerRPCCredentials(macCred))
ctx, cancel := context.WithTimeout(context.Background(), DefaultTimeout)
defer cancel()
return grpc.DialContext(ctx, hn.cfg.RPCAddr(), opts...)
}
// ConnectRPC uses the TLS certificate and admin macaroon files written by the
// lnd node to create a gRPC client connection.
func (hn *HarnessNode) ConnectRPC(useMacs bool) (*grpc.ClientConn, error) {
// If we don't want to use macaroons, just pass nil, the next method
// will handle it correctly.
if !useMacs {
return hn.ConnectRPCWithMacaroon(nil)
}
// If we should use a macaroon, always take the admin macaroon as a
// default.
mac, err := hn.ReadMacaroon(hn.cfg.AdminMacPath, DefaultTimeout)
if err != nil {
return nil, err
}
return hn.ConnectRPCWithMacaroon(mac)
}
// SetExtraArgs assigns the ExtraArgs field for the node's configuration. The
// changes will take effect on restart.
func (hn *HarnessNode) SetExtraArgs(extraArgs []string) {
hn.cfg.ExtraArgs = extraArgs
}
// cleanup cleans up all the temporary files created by the node's process.
func (hn *HarnessNode) cleanup() error {
return os.RemoveAll(hn.cfg.BaseDir)
}
// Stop attempts to stop the active lnd process.
func (hn *HarnessNode) stop() error {
// Do nothing if the process is not running.
if hn.processExit == nil {
return nil
}
// If start() failed before creating a client, we will just wait for the
// child process to die.
if hn.LightningClient != nil {
// Don't watch for error because sometimes the RPC connection gets
// closed before a response is returned.
req := lnrpc.StopRequest{}
ctx := context.Background()
hn.LightningClient.StopDaemon(ctx, &req)
}
// Wait for lnd process and other goroutines to exit.
select {
case <-hn.processExit:
case <-time.After(60 * time.Second):
return fmt.Errorf("process did not exit")
}
close(hn.quit)
hn.wg.Wait()
hn.quit = nil
hn.processExit = nil
hn.LightningClient = nil
hn.WalletUnlockerClient = nil
hn.Watchtower = nil
hn.WatchtowerClient = nil
return nil
}
// shutdown stops the active lnd process and cleans up any temporary directories
// created along the way.
func (hn *HarnessNode) shutdown() error {
if err := hn.stop(); err != nil {
return err
}
if err := hn.cleanup(); err != nil {
return err
}
return nil
}
// closeChanWatchRequest is a request to the lightningNetworkWatcher to be
// notified once it's detected within the test Lightning Network, that a
// channel has either been added or closed.
type chanWatchRequest struct {
chanPoint wire.OutPoint
chanOpen bool
eventChan chan struct{}
}
// getChanPointFundingTxid returns the given channel point's funding txid in
// raw bytes.
func getChanPointFundingTxid(chanPoint *lnrpc.ChannelPoint) ([]byte, error) {
var txid []byte
// A channel point's funding txid can be get/set as a byte slice or a
// string. In the case it is a string, decode it.
switch chanPoint.GetFundingTxid().(type) {
case *lnrpc.ChannelPoint_FundingTxidBytes:
txid = chanPoint.GetFundingTxidBytes()
case *lnrpc.ChannelPoint_FundingTxidStr:
s := chanPoint.GetFundingTxidStr()
h, err := chainhash.NewHashFromStr(s)
if err != nil {
return nil, err
}
txid = h[:]
}
return txid, nil
}
// lightningNetworkWatcher is a goroutine which is able to dispatch
// notifications once it has been observed that a target channel has been
// closed or opened within the network. In order to dispatch these
// notifications, the GraphTopologySubscription client exposed as part of the
// gRPC interface is used.
func (hn *HarnessNode) lightningNetworkWatcher() {
defer hn.wg.Done()
graphUpdates := make(chan *lnrpc.GraphTopologyUpdate)
hn.wg.Add(1)
go func() {
defer hn.wg.Done()
req := &lnrpc.GraphTopologySubscription{}
ctx, cancelFunc := context.WithCancel(context.Background())
topologyClient, err := hn.SubscribeChannelGraph(ctx, req)
if err != nil {
// We panic here in case of an error as failure to
// create the topology client will cause all subsequent
// tests to fail.
panic(fmt.Errorf("unable to create topology "+
"client: %v", err))
}
defer cancelFunc()
for {
update, err := topologyClient.Recv()
if err == io.EOF {
return
} else if err != nil {
return
}
select {
case graphUpdates <- update:
case <-hn.quit:
return
}
}
}()
for {
select {
// A new graph update has just been received, so we'll examine
// the current set of registered clients to see if we can
// dispatch any requests.
case graphUpdate := <-graphUpdates:
// For each new channel, we'll increment the number of
// edges seen by one.
for _, newChan := range graphUpdate.ChannelUpdates {
txidHash, _ := getChanPointFundingTxid(newChan.ChanPoint)
txid, _ := chainhash.NewHash(txidHash)
op := wire.OutPoint{
Hash: *txid,
Index: newChan.ChanPoint.OutputIndex,
}
hn.openChans[op]++
// For this new channel, if the number of edges
// seen is less than two, then the channel
// hasn't been fully announced yet.
if numEdges := hn.openChans[op]; numEdges < 2 {
continue
}
// Otherwise, we'll notify all the registered
// clients and remove the dispatched clients.
for _, eventChan := range hn.openClients[op] {
close(eventChan)
}
delete(hn.openClients, op)
}
// For each channel closed, we'll mark that we've
// detected a channel closure while lnd was pruning the
// channel graph.
for _, closedChan := range graphUpdate.ClosedChans {
txidHash, _ := getChanPointFundingTxid(closedChan.ChanPoint)
txid, _ := chainhash.NewHash(txidHash)
op := wire.OutPoint{
Hash: *txid,
Index: closedChan.ChanPoint.OutputIndex,
}
hn.closedChans[op] = struct{}{}
// As the channel has been closed, we'll notify
// all register clients.
for _, eventChan := range hn.closeClients[op] {
close(eventChan)
}
delete(hn.closeClients, op)
}
// A new watch request, has just arrived. We'll either be able
// to dispatch immediately, or need to add the client for
// processing later.
case watchRequest := <-hn.chanWatchRequests:
targetChan := watchRequest.chanPoint
// TODO(roasbeef): add update type also, checks for
// multiple of 2
if watchRequest.chanOpen {
// If this is an open request, then it can be
// dispatched if the number of edges seen for
// the channel is at least two.
if numEdges := hn.openChans[targetChan]; numEdges >= 2 {
close(watchRequest.eventChan)
continue
}
// Otherwise, we'll add this to the list of
// watch open clients for this out point.
hn.openClients[targetChan] = append(
hn.openClients[targetChan],
watchRequest.eventChan,
)
continue
}
// If this is a close request, then it can be
// immediately dispatched if we've already seen a
// channel closure for this channel.
if _, ok := hn.closedChans[targetChan]; ok {
close(watchRequest.eventChan)
continue
}
// Otherwise, we'll add this to the list of close watch
// clients for this out point.
hn.closeClients[targetChan] = append(
hn.closeClients[targetChan],
watchRequest.eventChan,
)
case <-hn.quit:
return
}
}
}
// WaitForNetworkChannelOpen will block until a channel with the target
// outpoint is seen as being fully advertised within the network. A channel is
// considered "fully advertised" once both of its directional edges has been
// advertised within the test Lightning Network.
func (hn *HarnessNode) WaitForNetworkChannelOpen(ctx context.Context,
op *lnrpc.ChannelPoint) error {
eventChan := make(chan struct{})
txidHash, err := getChanPointFundingTxid(op)
if err != nil {
return err
}
txid, err := chainhash.NewHash(txidHash)
if err != nil {
return err
}
hn.chanWatchRequests <- &chanWatchRequest{
chanPoint: wire.OutPoint{
Hash: *txid,
Index: op.OutputIndex,
},
eventChan: eventChan,
chanOpen: true,
}
select {
case <-eventChan:
return nil
case <-ctx.Done():
return fmt.Errorf("channel not opened before timeout")
}
}
// WaitForNetworkChannelClose will block until a channel with the target
// outpoint is seen as closed within the network. A channel is considered
// closed once a transaction spending the funding outpoint is seen within a
// confirmed block.
func (hn *HarnessNode) WaitForNetworkChannelClose(ctx context.Context,
op *lnrpc.ChannelPoint) error {
eventChan := make(chan struct{})
txidHash, err := getChanPointFundingTxid(op)
if err != nil {
return err
}
txid, err := chainhash.NewHash(txidHash)
if err != nil {
return err
}
hn.chanWatchRequests <- &chanWatchRequest{
chanPoint: wire.OutPoint{
Hash: *txid,
Index: op.OutputIndex,
},
eventChan: eventChan,
chanOpen: false,
}
select {
case <-eventChan:
return nil
case <-ctx.Done():
return fmt.Errorf("channel not closed before timeout")
}
}
// WaitForBlockchainSync will block until the target nodes has fully
// synchronized with the blockchain. If the passed context object has a set
// timeout, then the goroutine will continually poll until the timeout has
// elapsed. In the case that the chain isn't synced before the timeout is up,
// then this function will return an error.
func (hn *HarnessNode) WaitForBlockchainSync(ctx context.Context) error {
errChan := make(chan error, 1)
retryDelay := time.Millisecond * 100
go func() {
for {
select {
case <-ctx.Done():
case <-hn.quit:
return
default:
}
getInfoReq := &lnrpc.GetInfoRequest{}
getInfoResp, err := hn.GetInfo(ctx, getInfoReq)
if err != nil {
errChan <- err
return
}
if getInfoResp.SyncedToChain {
errChan <- nil
return
}
select {
case <-ctx.Done():
return
case <-time.After(retryDelay):
}
}
}()
select {
case <-hn.quit:
return nil
case err := <-errChan:
return err
case <-ctx.Done():
return fmt.Errorf("Timeout while waiting for blockchain sync")
}
}
// WaitForBalance waits until the node sees the expected confirmed/unconfirmed
// balance within their wallet.
func (hn *HarnessNode) WaitForBalance(expectedBalance btcutil.Amount, confirmed bool) error {
ctx := context.Background()
req := &lnrpc.WalletBalanceRequest{}
var lastBalance btcutil.Amount
doesBalanceMatch := func() bool {
balance, err := hn.WalletBalance(ctx, req)
if err != nil {
return false
}
if confirmed {
lastBalance = btcutil.Amount(balance.ConfirmedBalance)
return btcutil.Amount(balance.ConfirmedBalance) == expectedBalance
}
lastBalance = btcutil.Amount(balance.UnconfirmedBalance)
return btcutil.Amount(balance.UnconfirmedBalance) == expectedBalance
}
err := wait.Predicate(doesBalanceMatch, 30*time.Second)
if err != nil {
return fmt.Errorf("balances not synced after deadline: "+
"expected %v, only have %v", expectedBalance, lastBalance)
}
return nil
}
// fileExists reports whether the named file or directory exists.
// This function is taken from https://github.com/btcsuite/btcd
func fileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}