lnd.xprv/lntest/btcd.go

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// +build !bitcoind,!neutrino
package lntest
import (
"encoding/hex"
"errors"
"fmt"
"os"
"github.com/btcsuite/btcd/btcjson"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/integration/rpctest"
"github.com/btcsuite/btcd/rpcclient"
)
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// logDirPattern is the pattern of the name of the temporary log directory.
const logDirPattern = "%s/.backendlogs"
// temp is used to signal we want to establish a temporary connection using the
// btcd Node API.
//
// NOTE: Cannot be const, since the node API expects a reference.
var temp = "temp"
// BtcdBackendConfig is an implementation of the BackendConfig interface
// backed by a btcd node.
type BtcdBackendConfig struct {
// rpcConfig houses the connection config to the backing btcd instance.
rpcConfig rpcclient.ConnConfig
// harness is the backing btcd instance.
harness *rpctest.Harness
// minerAddr is the p2p address of the miner to connect to.
minerAddr string
}
// A compile time assertion to ensure BtcdBackendConfig meets the BackendConfig
// interface.
var _ BackendConfig = (*BtcdBackendConfig)(nil)
// GenArgs returns the arguments needed to be passed to LND at startup for
// using this node as a chain backend.
func (b BtcdBackendConfig) GenArgs() []string {
var args []string
encodedCert := hex.EncodeToString(b.rpcConfig.Certificates)
args = append(args, "--bitcoin.node=btcd")
args = append(args, fmt.Sprintf("--btcd.rpchost=%v", b.rpcConfig.Host))
args = append(args, fmt.Sprintf("--btcd.rpcuser=%v", b.rpcConfig.User))
args = append(args, fmt.Sprintf("--btcd.rpcpass=%v", b.rpcConfig.Pass))
args = append(args, fmt.Sprintf("--btcd.rawrpccert=%v", encodedCert))
return args
}
// ConnectMiner is called to establish a connection to the test miner.
func (b BtcdBackendConfig) ConnectMiner() error {
return b.harness.Client.Node(btcjson.NConnect, b.minerAddr, &temp)
}
// DisconnectMiner is called to disconnect the miner.
func (b BtcdBackendConfig) DisconnectMiner() error {
return b.harness.Client.Node(btcjson.NDisconnect, b.minerAddr, &temp)
}
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// Name returns the name of the backend type.
func (b BtcdBackendConfig) Name() string {
return "btcd"
}
// NewBackend starts a new rpctest.Harness and returns a BtcdBackendConfig for
// that node. miner should be set to the P2P address of the miner to connect
// to.
func NewBackend(miner string, netParams *chaincfg.Params) (
*BtcdBackendConfig, func() error, error) {
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baseLogDir := fmt.Sprintf(logDirPattern, GetLogDir())
args := []string{
"--rejectnonstd",
"--txindex",
"--trickleinterval=100ms",
"--debuglevel=debug",
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"--logdir=" + baseLogDir,
"--nowinservice",
// The miner will get banned and disconnected from the node if
// its requested data are not found. We add a nobanning flag to
// make sure they stay connected if it happens.
"--nobanning",
}
chainBackend, err := rpctest.New(netParams, nil, args, GetBtcdBinary())
if err != nil {
return nil, nil, fmt.Errorf("unable to create btcd node: %v", err)
}
// We want to overwrite some of the connection settings to make the
// tests more robust. We might need to restart the backend while there
// are already blocks present, which will take a bit longer than the
// 1 second the default settings amount to. Doubling both values will
// give us retries up to 4 seconds.
chainBackend.MaxConnRetries = rpctest.DefaultMaxConnectionRetries * 2
chainBackend.ConnectionRetryTimeout = rpctest.DefaultConnectionRetryTimeout * 2
if err := chainBackend.SetUp(false, 0); err != nil {
return nil, nil, fmt.Errorf("unable to set up btcd backend: %v", err)
}
bd := &BtcdBackendConfig{
rpcConfig: chainBackend.RPCConfig(),
harness: chainBackend,
minerAddr: miner,
}
cleanUp := func() error {
var errStr string
if err := chainBackend.TearDown(); err != nil {
errStr += err.Error() + "\n"
}
// After shutting down the chain backend, we'll make a copy of
// the log file before deleting the temporary log dir.
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logFile := baseLogDir + "/" + netParams.Name + "/btcd.log"
logDestination := fmt.Sprintf(
"%s/output_btcd_chainbackend.log", GetLogDir(),
)
err := CopyFile(logDestination, logFile)
if err != nil {
errStr += fmt.Sprintf("unable to copy file: %v\n", err)
}
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if err = os.RemoveAll(baseLogDir); err != nil {
errStr += fmt.Sprintf(
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"cannot remove dir %s: %v\n", baseLogDir, err,
)
}
if errStr != "" {
return errors.New(errStr)
}
return nil
}
return bd, cleanUp, nil
}