forked from etcd-io/etcd
/
grpc_proxy.go
310 lines (269 loc) · 10 KB
/
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 (
"crypto/tls"
"fmt"
"math"
"net"
"net/http"
"net/url"
"os"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/clientv3/namespace"
"github.com/coreos/etcd/etcdserver/api/v3election/v3electionpb"
"github.com/coreos/etcd/etcdserver/api/v3lock/v3lockpb"
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
"github.com/coreos/etcd/pkg/debugutil"
"github.com/coreos/etcd/pkg/transport"
"github.com/coreos/etcd/proxy/grpcproxy"
"github.com/cockroachdb/cmux"
grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/prometheus/client_golang/prometheus"
"github.com/spf13/cobra"
"google.golang.org/grpc"
)
var (
grpcProxyListenAddr string
grpcProxyMetricsListenAddr string
grpcProxyEndpoints []string
grpcProxyDNSCluster string
grpcProxyInsecureDiscovery bool
// tls for connecting to etcd
grpcProxyCA string
grpcProxyCert string
grpcProxyKey string
// tls for clients connecting to proxy
grpcProxyListenCA string
grpcProxyListenCert string
grpcProxyListenKey string
grpcProxyAdvertiseClientURL string
grpcProxyResolverPrefix string
grpcProxyResolverTTL int
grpcProxyNamespace string
grpcProxyEnablePprof bool
)
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().StringVar(&grpcProxyDNSCluster, "discovery-srv", "", "DNS domain used to bootstrap initial cluster")
cmd.Flags().StringVar(&grpcProxyMetricsListenAddr, "metrics-addr", "", "listen for /metrics requests on an additional interface")
cmd.Flags().BoolVar(&grpcProxyInsecureDiscovery, "insecure-discovery", false, "accept insecure SRV records")
cmd.Flags().StringSliceVar(&grpcProxyEndpoints, "endpoints", []string{"127.0.0.1:2379"}, "comma separated etcd cluster endpoints")
cmd.Flags().StringVar(&grpcProxyAdvertiseClientURL, "advertise-client-url", "127.0.0.1:23790", "advertise address to register (must be reachable by client)")
cmd.Flags().StringVar(&grpcProxyResolverPrefix, "resolver-prefix", "", "prefix to use for registering proxy (must be shared with other grpc-proxy members)")
cmd.Flags().IntVar(&grpcProxyResolverTTL, "resolver-ttl", 0, "specify TTL, in seconds, when registering proxy endpoints")
cmd.Flags().StringVar(&grpcProxyNamespace, "namespace", "", "string to prefix to all keys for namespacing requests")
cmd.Flags().BoolVar(&grpcProxyEnablePprof, "enable-pprof", false, `Enable runtime profiling data via HTTP server. Address is at client URL + "/debug/pprof/"`)
// client TLS for connecting to server
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")
// client TLS for connecting to proxy
cmd.Flags().StringVar(&grpcProxyListenCert, "cert-file", "", "identify secure connections to the proxy using this TLS certificate file")
cmd.Flags().StringVar(&grpcProxyListenKey, "key-file", "", "identify secure connections to the proxy using this TLS key file")
cmd.Flags().StringVar(&grpcProxyListenCA, "trusted-ca-file", "", "verify certificates of TLS-enabled secure proxy using this CA bundle")
return &cmd
}
func startGRPCProxy(cmd *cobra.Command, args []string) {
checkArgs()
tlsinfo := newTLS(grpcProxyListenCA, grpcProxyListenCert, grpcProxyListenKey)
if tlsinfo != nil {
plog.Infof("ServerTLS: %s", tlsinfo)
}
m := mustListenCMux(tlsinfo)
grpcl := m.Match(cmux.HTTP2())
defer func() {
grpcl.Close()
plog.Infof("stopping listening for grpc-proxy client requests on %s", grpcProxyListenAddr)
}()
client := mustNewClient()
srvhttp, httpl := mustHTTPListener(m, tlsinfo)
errc := make(chan error)
go func() { errc <- newGRPCProxyServer(client).Serve(grpcl) }()
go func() { errc <- srvhttp.Serve(httpl) }()
go func() { errc <- m.Serve() }()
if len(grpcProxyMetricsListenAddr) > 0 {
mhttpl := mustMetricsListener(tlsinfo)
go func() {
mux := http.NewServeMux()
mux.Handle("/metrics", prometheus.Handler())
plog.Fatal(http.Serve(mhttpl, mux))
}()
}
// grpc-proxy is initialized, ready to serve
notifySystemd()
fmt.Fprintln(os.Stderr, <-errc)
os.Exit(1)
}
func checkArgs() {
if grpcProxyResolverPrefix != "" && grpcProxyResolverTTL < 1 {
fmt.Fprintln(os.Stderr, fmt.Errorf("invalid resolver-ttl %d", grpcProxyResolverTTL))
os.Exit(1)
}
if grpcProxyResolverPrefix == "" && grpcProxyResolverTTL > 0 {
fmt.Fprintln(os.Stderr, fmt.Errorf("invalid resolver-prefix %q", grpcProxyResolverPrefix))
os.Exit(1)
}
if grpcProxyResolverPrefix != "" && grpcProxyResolverTTL > 0 && grpcProxyAdvertiseClientURL == "" {
fmt.Fprintln(os.Stderr, fmt.Errorf("invalid advertise-client-url %q", grpcProxyAdvertiseClientURL))
os.Exit(1)
}
}
func mustNewClient() *clientv3.Client {
srvs := discoverEndpoints(grpcProxyDNSCluster, grpcProxyCA, grpcProxyInsecureDiscovery)
eps := srvs.Endpoints
if len(eps) == 0 {
eps = grpcProxyEndpoints
}
cfg, err := newClientCfg(eps)
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)
}
return client
}
func newClientCfg(eps []string) (*clientv3.Config, error) {
// set tls if any one tls option set
cfg := clientv3.Config{
Endpoints: eps,
DialTimeout: 5 * time.Second,
}
if tls := newTLS(grpcProxyCA, grpcProxyCert, grpcProxyKey); tls != nil {
clientTLS, err := tls.ClientConfig()
if err != nil {
return nil, err
}
cfg.TLS = clientTLS
plog.Infof("ClientTLS: %s", tls)
}
// TODO: support insecure tls
return &cfg, nil
}
func newTLS(ca, cert, key string) *transport.TLSInfo {
if ca == "" && cert == "" && key == "" {
return nil
}
return &transport.TLSInfo{CAFile: ca, CertFile: cert, KeyFile: key}
}
func mustListenCMux(tlsinfo *transport.TLSInfo) cmux.CMux {
l, err := net.Listen("tcp", grpcProxyListenAddr)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
var tlscfg *tls.Config
scheme := "http"
if tlsinfo != nil {
if tlscfg, err = tlsinfo.ServerConfig(); err != nil {
plog.Fatal(err)
}
scheme = "https"
}
if l, err = transport.NewKeepAliveListener(l, scheme, tlscfg); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
plog.Infof("listening for grpc-proxy client requests on %s", grpcProxyListenAddr)
return cmux.New(l)
}
func newGRPCProxyServer(client *clientv3.Client) *grpc.Server {
if len(grpcProxyNamespace) > 0 {
client.KV = namespace.NewKV(client.KV, grpcProxyNamespace)
client.Watcher = namespace.NewWatcher(client.Watcher, grpcProxyNamespace)
client.Lease = namespace.NewLease(client.Lease, grpcProxyNamespace)
}
kvp, _ := grpcproxy.NewKvProxy(client)
watchp, _ := grpcproxy.NewWatchProxy(client)
if grpcProxyResolverPrefix != "" {
grpcproxy.Register(client, grpcProxyResolverPrefix, grpcProxyAdvertiseClientURL, grpcProxyResolverTTL)
}
clusterp, _ := grpcproxy.NewClusterProxy(client, grpcProxyAdvertiseClientURL, grpcProxyResolverPrefix)
leasep, _ := grpcproxy.NewLeaseProxy(client)
mainp := grpcproxy.NewMaintenanceProxy(client)
authp := grpcproxy.NewAuthProxy(client)
electionp := grpcproxy.NewElectionProxy(client)
lockp := grpcproxy.NewLockProxy(client)
server := grpc.NewServer(
grpc.StreamInterceptor(grpc_prometheus.StreamServerInterceptor),
grpc.UnaryInterceptor(grpc_prometheus.UnaryServerInterceptor),
grpc.MaxConcurrentStreams(math.MaxUint32),
)
pb.RegisterKVServer(server, kvp)
pb.RegisterWatchServer(server, watchp)
pb.RegisterClusterServer(server, clusterp)
pb.RegisterLeaseServer(server, leasep)
pb.RegisterMaintenanceServer(server, mainp)
pb.RegisterAuthServer(server, authp)
v3electionpb.RegisterElectionServer(server, electionp)
v3lockpb.RegisterLockServer(server, lockp)
return server
}
func mustHTTPListener(m cmux.CMux, tlsinfo *transport.TLSInfo) (*http.Server, net.Listener) {
httpmux := http.NewServeMux()
httpmux.HandleFunc("/", http.NotFound)
httpmux.Handle("/metrics", prometheus.Handler())
if grpcProxyEnablePprof {
for p, h := range debugutil.PProfHandlers() {
httpmux.Handle(p, h)
}
plog.Infof("pprof is enabled under %s", debugutil.HTTPPrefixPProf)
}
srvhttp := &http.Server{Handler: httpmux}
if tlsinfo == nil {
return srvhttp, m.Match(cmux.HTTP1())
}
srvTLS, err := tlsinfo.ServerConfig()
if err != nil {
plog.Fatalf("could not setup TLS (%v)", err)
}
srvhttp.TLSConfig = srvTLS
return srvhttp, m.Match(cmux.Any())
}
func mustMetricsListener(tlsinfo *transport.TLSInfo) net.Listener {
murl, err := url.Parse(grpcProxyMetricsListenAddr)
if err != nil {
fmt.Fprintf(os.Stderr, "cannot parse %q", grpcProxyMetricsListenAddr)
os.Exit(1)
}
ml, err := transport.NewListener(murl.Host, murl.Scheme, tlsinfo)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
plog.Info("grpc-proxy: listening for metrics on ", murl.String())
return ml
}