etcdserver,embed: discard gRPC info logs when debug is off

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

Conflicts:
	embed/etcd.go
	etcdserver/api/v3rpc/grpc.go
	etcdserver/config.go

embed/etcd.go

@@ -146,6 +146,7 @@ func StartEtcd(inCfg *Config) (e *Etcd, err error) {
 		StrictReconfigCheck:     cfg.StrictReconfigCheck,
 		ClientCertAuthEnabled:   cfg.ClientTLSInfo.ClientCertAuth,
 		AuthToken:               cfg.AuthToken,
+		Debug:                   cfg.Debug,
 	}
 
 	if e.Server, err = etcdserver.NewServer(srvcfg); err != nil {

etcdserver/api/v3rpc/grpc.go

@@ -16,7 +16,9 @@ package v3rpc
 
 import (
 	"crypto/tls"
+	"io/ioutil"
 	"math"
+	"os"
 
 	"github.com/coreos/etcd/etcdserver"
 	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
@@ -31,10 +33,6 @@ const (
 	maxSendBytes      = math.MaxInt32
 )
 
-func init() {
-	grpclog.SetLogger(plog)
-}
-
 func Server(s *etcdserver.EtcdServer, tls *tls.Config, gopts ...grpc.ServerOption) *grpc.Server {
 	var opts []grpc.ServerOption
 	opts = append(opts, grpc.CustomCodec(&codec{}))
@@ -55,5 +53,13 @@ func Server(s *etcdserver.EtcdServer, tls *tls.Config, gopts ...grpc.ServerOptio
 	pb.RegisterAuthServer(grpcServer, NewAuthServer(s))
 	pb.RegisterMaintenanceServer(grpcServer, NewMaintenanceServer(s))
 
+	if s.Cfg.Debug {
+		grpc.EnableTracing = true
+		// enable info, warning, error
+		grpclog.SetLoggerV2(grpclog.NewLoggerV2(os.Stderr, os.Stderr, os.Stderr))
+	} else {
+		// only discard info
+		grpclog.SetLoggerV2(grpclog.NewLoggerV2(ioutil.Discard, os.Stderr, os.Stderr))
+	}
 	return grpcServer
 }

etcdserver/config.go

@@ -64,6 +64,8 @@ type ServerConfig struct {
 	ClientCertAuthEnabled bool
 
 	AuthToken string
+
+	Debug bool
 }
 
 // VerifyBootstrap sanity-checks the initial config for bootstrap case