Backport of pull/14354 to 3.5.5

Signed-off-by: Vitalii Levitskii <vitalii@uber.com>

server/etcdmain/grpc_proxy.go

@@ -54,15 +54,16 @@ import (
 )
 
 var (
-	grpcProxyListenAddr            string
-	grpcProxyMetricsListenAddr     string
-	grpcProxyEndpoints             []string
-	grpcProxyDNSCluster            string
-	grpcProxyDNSClusterServiceName string
-	grpcProxyInsecureDiscovery     bool
-	grpcProxyDataDir               string
-	grpcMaxCallSendMsgSize         int
-	grpcMaxCallRecvMsgSize         int
+	grpcProxyListenAddr                string
+	grpcProxyMetricsListenAddr         string
+	grpcProxyEndpoints                 []string
+	grpcProxyEndpointsAutoSyncInterval time.Duration
+	grpcProxyDNSCluster                string
+	grpcProxyDNSClusterServiceName     string
+	grpcProxyInsecureDiscovery         bool
+	grpcProxyDataDir                   string
+	grpcMaxCallSendMsgSize             int
+	grpcMaxCallRecvMsgSize             int
 
 	// tls for connecting to etcd
 
@@ -130,6 +131,7 @@ func newGRPCProxyStartCommand() *cobra.Command {
 	cmd.Flags().StringVar(&grpcProxyMetricsListenAddr, "metrics-addr", "", "listen for endpoint /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().DurationVar(&grpcProxyEndpointsAutoSyncInterval, "endpoints-auto-sync-interval", 0, "etcd endpoints auto sync interval (disabled by default)")
 	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")
@@ -333,8 +335,9 @@ func newProxyClientCfg(lg *zap.Logger, eps []string, tls *transport.TLSInfo) (*c
 func newClientCfg(lg *zap.Logger, eps []string) (*clientv3.Config, error) {
 	// set tls if any one tls option set
 	cfg := clientv3.Config{
-		Endpoints:   eps,
-		DialTimeout: 5 * time.Second,
+		Endpoints:        eps,
+		AutoSyncInterval: grpcProxyEndpointsAutoSyncInterval,
+		DialTimeout:      5 * time.Second,
 	}
 
 	if grpcMaxCallSendMsgSize > 0 {

tests/e2e/etcd_grpcproxy_test.go

@@ -0,0 +1,177 @@
+// Copyright 2017 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 e2e
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	"go.etcd.io/etcd/api/v3/etcdserverpb"
+	"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
+	"go.etcd.io/etcd/pkg/v3/expect"
+)
+
+func TestGrpcProxyAutoSync(t *testing.T) {
+	skipInShortMode(t)
+
+	var (
+		node1Name      = "node1"
+		node1ClientURL = "http://localhost:12379"
+		node1PeerURL   = "http://localhost:12380"
+
+		node2Name      = "node2"
+		node2ClientURL = "http://localhost:22379"
+		node2PeerURL   = "http://localhost:22380"
+
+		proxyClientURL = "127.0.0.1:32379"
+
+		autoSyncInterval = 1 * time.Second
+	)
+
+	// Run cluster of one node
+	proc1, err := runEtcdNode(
+		node1Name, t.TempDir(),
+		node1ClientURL, node1PeerURL,
+		"new", fmt.Sprintf("%s=%s", node1Name, node1PeerURL),
+	)
+	require.NoError(t, err)
+
+	// Run grpc-proxy instance
+	proxyProc, err := spawnCmd([]string{binDir + "/etcd", "grpc-proxy", "start",
+		"--advertise-client-url", proxyClientURL, "--listen-addr", proxyClientURL,
+		"--endpoints", node1ClientURL,
+		"--endpoints-auto-sync-interval", autoSyncInterval.String(),
+	}, nil)
+	require.NoError(t, err)
+
+	err = spawnWithExpect([]string{ctlBinPath, "--endpoints", proxyClientURL, "put", "k1", "v1"}, "OK")
+	require.NoError(t, err)
+
+	err = spawnWithExpect([]string{ctlBinPath, "--endpoints", node1ClientURL, "member", "add", node2Name, "--peer-urls", node2PeerURL}, "added")
+	require.NoError(t, err)
+
+	// Run new member
+	proc2, err := runEtcdNode(
+		node2Name, t.TempDir(),
+		node2ClientURL, node2PeerURL,
+		"existing", fmt.Sprintf("%s=%s,%s=%s", node1Name, node1PeerURL, node2Name, node2PeerURL),
+	)
+	require.NoError(t, err)
+
+	// Wait for auto sync of endpoints
+	_, err = proxyProc.Expect(strings.Replace(node2ClientURL, "http://", "", 1))
+	require.NoError(t, err)
+
+	memberList, err := getMemberListFromEndpoint(node1ClientURL)
+	require.NoError(t, err)
+
+	node1MemberID, err := findMemberIDByEndpoint(memberList.Members, node1ClientURL)
+	require.NoError(t, err)
+
+	node2MemberID, err := findMemberIDByEndpoint(memberList.Members, node2ClientURL)
+	require.NoError(t, err)
+
+	// Remove node1 from member list and stop this node
+
+	// Second node could be not ready yet
+	for i := 0; i < 10; i++ {
+		err = spawnWithExpect([]string{ctlBinPath, "--endpoints", node2ClientURL, "member", "remove", fmt.Sprintf("%x", node1MemberID)}, "removed")
+		if err != nil && strings.Contains(err.Error(), rpctypes.ErrGRPCUnhealthy.Error()) {
+			time.Sleep(500 * time.Millisecond)
+			continue
+		}
+		break
+	}
+
+	require.NoError(t, err)
+
+	_, err = proc1.Expect("the member has been permanently removed from the cluster")
+	require.NoError(t, err)
+	require.NoError(t, proc1.Stop())
+
+	_, err = proc2.Expect(fmt.Sprintf("%x became leader", node2MemberID))
+	require.NoError(t, err)
+
+	for i := 0; i < 10; i++ {
+		err = spawnWithExpect([]string{ctlBinPath, "--endpoints", proxyClientURL, "get", "k1"}, "v1")
+		if err != nil && (strings.Contains(err.Error(), rpctypes.ErrGRPCLeaderChanged.Error()) ||
+			strings.Contains(err.Error(), context.DeadlineExceeded.Error())) {
+			time.Sleep(500 * time.Millisecond)
+			continue
+		}
+		break
+	}
+	require.NoError(t, err)
+
+	require.NoError(t, proc2.Stop())
+	require.NoError(t, proxyProc.Stop())
+}
+
+func runEtcdNode(name, dataDir, clientURL, peerURL, clusterState, initialCluster string) (*expect.ExpectProcess, error) {
+	proc, err := spawnCmd([]string{binPath,
+		"--name", name,
+		"--data-dir", dataDir,
+		"--listen-client-urls", clientURL, "--advertise-client-urls", clientURL,
+		"--listen-peer-urls", peerURL, "--initial-advertise-peer-urls", peerURL,
+		"--initial-cluster-token", "etcd-cluster",
+		"--initial-cluster-state", clusterState,
+		"--initial-cluster", initialCluster,
+	}, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = proc.Expect("ready to serve client requests")
+
+	return proc, err
+}
+
+func findMemberIDByEndpoint(members []*etcdserverpb.Member, endpoint string) (uint64, error) {
+	for _, m := range members {
+		if m.ClientURLs[0] == endpoint {
+			return m.ID, nil
+		}
+	}
+
+	return 0, fmt.Errorf("member not found")
+}
+
+func getMemberListFromEndpoint(endpoint string) (etcdserverpb.MemberListResponse, error) {
+	proc, err := spawnCmd([]string{ctlBinPath, "--endpoints", endpoint, "member", "list", "--write-out", "json"}, nil)
+	if err != nil {
+		return etcdserverpb.MemberListResponse{}, err
+	}
+	var txt string
+	txt, err = proc.Expect("members")
+	if err != nil {
+		return etcdserverpb.MemberListResponse{}, err
+	}
+	if err = proc.Close(); err != nil {
+		return etcdserverpb.MemberListResponse{}, err
+	}
+
+	resp := etcdserverpb.MemberListResponse{}
+	dec := json.NewDecoder(strings.NewReader(txt))
+	if err := dec.Decode(&resp); err == io.EOF {
+		return etcdserverpb.MemberListResponse{}, err
+	}
+	return resp, nil
+}