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grpc_proxy.go
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grpc_proxy.go
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// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package etcdmain
import (
"fmt"
"net"
"os"
"time"
"github.com/coreos/etcd/clientv3"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/proxy/grpcproxy"
"github.com/spf13/cobra"
"google.golang.org/grpc"
)
var (
grpcProxyListenAddr string
grpcProxyEndpoints []string
grpcProxyCert string
grpcProxyKey string
grpcProxyCA string
)
func init() {
rootCmd.AddCommand(newGRPCProxyCommand())
}
// newGRPCProxyCommand returns the cobra command for "grpc-proxy".
func newGRPCProxyCommand() *cobra.Command {
lpc := &cobra.Command{
Use: "grpc-proxy <subcommand>",
Short: "grpc-proxy related command",
}
lpc.AddCommand(newGRPCProxyStartCommand())
return lpc
}
func newGRPCProxyStartCommand() *cobra.Command {
cmd := cobra.Command{
Use: "start",
Short: "start the grpc proxy",
Run: startGRPCProxy,
}
cmd.Flags().StringVar(&grpcProxyListenAddr, "listen-addr", "127.0.0.1:23790", "listen address")
cmd.Flags().StringSliceVar(&grpcProxyEndpoints, "endpoints", []string{"127.0.0.1:2379"}, "comma separated etcd cluster endpoints")
cmd.Flags().StringVar(&grpcProxyCert, "cert", "", "identify secure connections with etcd servers using this TLS certificate file")
cmd.Flags().StringVar(&grpcProxyKey, "key", "", "identify secure connections with etcd servers using this TLS key file")
cmd.Flags().StringVar(&grpcProxyCA, "cacert", "", "verify certificates of TLS-enabled secure etcd servers using this CA bundle")
return &cmd
}
func startGRPCProxy(cmd *cobra.Command, args []string) {
l, err := net.Listen("tcp", grpcProxyListenAddr)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
cfg, err := newClientCfg()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
client, err := clientv3.New(*cfg)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
kvp := grpcproxy.NewKvProxy(client)
watchp := grpcproxy.NewWatchProxy(client)
clusterp := grpcproxy.NewClusterProxy(client)
leasep := grpcproxy.NewLeaseProxy(client)
mainp := grpcproxy.NewMaintenanceProxy(client)
authp := grpcproxy.NewAuthProxy(client)
server := grpc.NewServer()
pb.RegisterKVServer(server, kvp)
pb.RegisterWatchServer(server, watchp)
pb.RegisterClusterServer(server, clusterp)
pb.RegisterLeaseServer(server, leasep)
pb.RegisterMaintenanceServer(server, mainp)
pb.RegisterAuthServer(server, authp)
server.Serve(l)
}
func newClientCfg() (*clientv3.Config, error) {
// set tls if any one tls option set
var cfgtls *transport.TLSInfo
tlsinfo := transport.TLSInfo{}
if grpcProxyCert != "" {
tlsinfo.CertFile = grpcProxyCert
cfgtls = &tlsinfo
}
if grpcProxyKey != "" {
tlsinfo.KeyFile = grpcProxyKey
cfgtls = &tlsinfo
}
if grpcProxyCA != "" {
tlsinfo.CAFile = grpcProxyCA
cfgtls = &tlsinfo
}
cfg := clientv3.Config{
Endpoints: grpcProxyEndpoints,
DialTimeout: 5 * time.Second,
}
if cfgtls != nil {
clientTLS, err := cfgtls.ClientConfig()
if err != nil {
return nil, err
}
cfg.TLS = clientTLS
}
// TODO: support insecure tls
return &cfg, nil
}