lnd.xprv/lnd.go

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package main
import (
"fmt"
"net"
"net/http"
_ "net/http/pprof"
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"os"
"runtime"
"strconv"
"golang.org/x/net/context"
"google.golang.org/grpc"
flags "github.com/btcsuite/go-flags"
proxy "github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnrpc"
)
var (
cfg *config
shutdownChannel = make(chan struct{})
registeredChains = newChainRegistry()
)
// 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())
// 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))
}()
}
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// Open the channeldb, which is dedicated to storing channel, and
// network related metadata.
chanDB, err := channeldb.Open(cfg.DataDir)
if err != nil {
ltndLog.Errorf("unable to open channeldb: %v", err)
return err
}
defer chanDB.Close()
// With the information parsed from the configuration, create valid
// instances of the paertinent interfaces required to operate the
// Lightning Network Daemon.
activeChainControl, err := newChainControlFromConfig(cfg, chanDB)
if err != nil {
fmt.Printf("unable to create chain control: %v\n", err)
return err
}
// Finally before we start the server, we'll register the "holy
// trinity" of interface for our current "home chain" with the active
// chainRegistry interface.
primaryChain := registeredChains.PrimaryChain()
registeredChains.RegisterChain(primaryChain, activeChainControl)
// Set up the core server which will listen for incoming peer
// connections.
defaultListenAddrs := []string{
net.JoinHostPort("", strconv.Itoa(cfg.PeerPort)),
}
// With all the relevant chains initialized, we can finally start the
// server itself.
server, err := newServer(defaultListenAddrs, chanDB, activeChainControl)
if err != nil {
srvrLog.Errorf("unable to create server: %v\n", err)
return err
}
if err := server.Start(); err != nil {
srvrLog.Errorf("unable to create to start server: %v\n", err)
return err
}
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)
// Next, Start the grpc server listening for HTTP/2 connections.
grpcEndpoint := fmt.Sprintf("localhost:%d", loadedConfig.RPCPort)
lis, err := net.Listen("tcp", grpcEndpoint)
if err != nil {
fmt.Printf("failed to listen: %v", err)
return err
}
defer lis.Close()
go func() {
rpcsLog.Infof("RPC server listening on %s", lis.Addr())
grpcServer.Serve(lis)
}()
// Finally, start the REST proxy for our gRPC server above.
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
mux := proxy.NewServeMux()
proxyOpts := []grpc.DialOption{grpc.WithInsecure()}
err = lnrpc.RegisterLightningHandlerFromEndpoint(ctx, mux, grpcEndpoint,
proxyOpts)
if err != nil {
return err
}
go func() {
rpcsLog.Infof("gRPC proxy started")
http.ListenAndServe(":8080", mux)
}()
// 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 {
if e, ok := err.(*flags.Error); ok && e.Type == flags.ErrHelp {
} else {
fmt.Fprintln(os.Stderr, err)
}
os.Exit(1)
}
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}