lnd.xprv/lnd.go
Olaoluwa Osuntokun 0085e2a38a
config: add an option to pass in a hex-encoded rpc cert (--rawrpccert)
This commit adds an option to pass in a raw hex-encoded rpc cert via
lnd’s configuration file. Such a change allows for programmatically
creating lnd nodes which can connect to an existing btcd instance
without requiring a file for the rpc cert to be specified.
Additionally, this commit makes the creation of an integration testing
harness easier.
2016-08-29 21:39:06 -07:00

175 lines
4.6 KiB
Go

package main
import (
"encoding/hex"
"fmt"
"io/ioutil"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path/filepath"
"runtime"
"strconv"
"google.golang.org/grpc"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnwallet"
)
var (
cfg *config
shutdownChannel = make(chan struct{})
)
// lndMain is the true entry point for lnd. This function is required since
// defers created in the top-level scope of a main method aren't executed if
// os.Exit() is called.
func lndMain() error {
// Load the configuration, and parse any command line options. This
// function will also set up logging properly.
loadedConfig, err := loadConfig()
if err != nil {
return err
}
cfg = loadedConfig
defer backendLog.Flush()
// Show version at startup.
ltndLog.Infof("Version %s", version())
if loadedConfig.SPVMode == true {
shell(loadedConfig.SPVHostAdr, activeNetParams.Params)
return err
}
// Enable http profiling server if requested.
if cfg.Profile != "" {
go func() {
listenAddr := net.JoinHostPort("", cfg.Profile)
profileRedirect := http.RedirectHandler("/debug/pprof",
http.StatusSeeOther)
http.Handle("/", profileRedirect)
fmt.Println(http.ListenAndServe(listenAddr, nil))
}()
}
// Open the channeldb, which is dedicated to storing channel, and
// network related meta-data.
chanDB, err := channeldb.Open(loadedConfig.DataDir, activeNetParams.Params)
if err != nil {
fmt.Println("unable to open channeldb: ", err)
return err
}
defer chanDB.Close()
// Next load btcd's TLS cert for the RPC connection. If a raw cert was
// specified in the config, then we'll se that directly. Otherwise, we
// attempt to read the cert from the path specified in the config.
var rpcCert []byte
if loadedConfig.RawRPCCert != "" {
rpcCert, err = hex.DecodeString(loadedConfig.RawRPCCert)
if err != nil {
return err
}
} else {
certFile, err := os.Open(loadedConfig.RPCCert)
if err != nil {
return err
}
rpcCert, err = ioutil.ReadAll(certFile)
if err != nil {
return err
}
if err := certFile.Close(); err != nil {
return err
}
}
rpcIP, err := net.LookupHost(loadedConfig.RPCHost)
if err != nil {
fmt.Printf("unable to resolve rpc host: %v", err)
return err
}
// Create, and start the lnwallet, which handles the core payment channel
// logic, and exposes control via proxy state machines.
config := &lnwallet.Config{
PrivatePass: []byte("hello"),
DataDir: filepath.Join(loadedConfig.DataDir, "lnwallet"),
RpcHost: fmt.Sprintf("%v:%v", rpcIP[0], activeNetParams.rpcPort),
RpcUser: loadedConfig.RPCUser,
RpcPass: loadedConfig.RPCPass,
CACert: rpcCert,
NetParams: activeNetParams.Params,
}
wallet, err := lnwallet.NewLightningWallet(config, chanDB)
if err != nil {
fmt.Printf("unable to create wallet: %v\n", err)
return err
}
if err := wallet.Startup(); err != nil {
fmt.Printf("unable to start wallet: %v\n", err)
return err
}
ltndLog.Info("LightningWallet opened")
ec := &lnwallet.WaddrmgrEncryptorDecryptor{wallet.Manager}
chanDB.RegisterCryptoSystem(ec)
// Set up the core server which will listen for incoming peer
// connections.
defaultListenAddrs := []string{
net.JoinHostPort("", strconv.Itoa(loadedConfig.PeerPort)),
}
server, err := newServer(defaultListenAddrs, wallet, chanDB)
if err != nil {
srvrLog.Errorf("unable to create server: %v\n", err)
return err
}
server.Start()
addInterruptHandler(func() {
ltndLog.Infof("Gracefully shutting down the server...")
server.Stop()
server.WaitForShutdown()
})
// Initialize, and register our implementation of the gRPC server.
var opts []grpc.ServerOption
grpcServer := grpc.NewServer(opts...)
lnrpc.RegisterLightningServer(grpcServer, server.rpcServer)
// Finally, start the grpc server listening for HTTP/2 connections.
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", loadedConfig.RPCPort))
if err != nil {
fmt.Printf("failed to listen: %v", err)
return err
}
go func() {
rpcsLog.Infof("RPC server listening on %s", lis.Addr())
grpcServer.Serve(lis)
}()
// Wait for shutdown signal from either a graceful server stop or from
// the interrupt handler.
<-shutdownChannel
ltndLog.Info("Shutdown complete")
return nil
}
func main() {
// Use all processor cores.
// TODO(roasbeef): remove this if required version # is > 1.6?
runtime.GOMAXPROCS(runtime.NumCPU())
// Call the "real" main in a nested manner so the defers will properly
// be executed in the case of a graceful shutdown.
if err := lndMain(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}