client: supports to add gRPC dial options (#2035) (#2043)

Signed-off-by: nolouch <nolouch@gmail.com>

client/client.go

@@ -15,6 +15,8 @@ package pd
 
 import (
 	"context"
+	"reflect"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -129,7 +131,8 @@ type client struct {
 	ctx    context.Context
 	cancel context.CancelFunc
 
-	security SecurityOption
+	security        SecurityOption
+	gRPCDialOptions []grpc.DialOption
 }
 
 // SecurityOption records options about tls
@@ -139,13 +142,23 @@ type SecurityOption struct {
 	KeyPath  string
 }
 
+// ClientOption configures client.
+type ClientOption func(c *client)
+
+// WithGRPCDialOptions configures the client with gRPC dial options.
+func WithGRPCDialOptions(opts ...grpc.DialOption) ClientOption {
+	return func(c *client) {
+		c.gRPCDialOptions = append(c.gRPCDialOptions, opts...)
+	}
+}
+
 // NewClient creates a PD client.
-func NewClient(pdAddrs []string, security SecurityOption) (Client, error) {
-	return NewClientWithContext(context.Background(), pdAddrs, security)
+func NewClient(pdAddrs []string, security SecurityOption, opts ...ClientOption) (Client, error) {
+	return NewClientWithContext(context.Background(), pdAddrs, security, opts...)
 }
 
 // NewClientWithContext creates a PD client with context.
-func NewClientWithContext(ctx context.Context, pdAddrs []string, security SecurityOption) (Client, error) {
+func NewClientWithContext(ctx context.Context, pdAddrs []string, security SecurityOption, opts ...ClientOption) (Client, error) {
 	log.Info("[pd] create pd client with endpoints", zap.Strings("pd-address", pdAddrs))
 	ctx1, cancel := context.WithCancel(ctx)
 	c := &client{
@@ -158,6 +171,9 @@ func NewClientWithContext(ctx context.Context, pdAddrs []string, security Securi
 		security:      security,
 	}
 	c.connMu.clientConns = make(map[string]*grpc.ClientConn)
+	for _, opt := range opts {
+		opt(c)
+	}
 
 	if err := c.initRetry(c.initClusterID); err != nil {
 		cancel()
@@ -182,6 +198,14 @@ func (c *client) updateURLs(members []*pdpb.Member) {
 	for _, m := range members {
 		urls = append(urls, m.GetClientUrls()...)
 	}
+
+	sort.Strings(urls)
+	// the url list is same.
+	if reflect.DeepEqual(c.urls, urls) {
+		return
+	}
+
+	log.Info("[pd] update member urls", zap.Strings("old-urls", c.urls), zap.Strings("new-urls", urls))
 	c.urls = urls
 }
 
@@ -222,7 +246,7 @@ func (c *client) updateLeader() error {
 		ctx, cancel := context.WithTimeout(c.ctx, updateLeaderTimeout)
 		members, err := c.getMembers(ctx, u)
 		if err != nil {
-			log.Warn("cannot update leader", zap.String("address", u), zap.Error(err))
+			log.Warn("[pd] cannot update leader", zap.String("address", u), zap.Error(err))
 		}
 		cancel()
 		if err != nil || members.GetLeader() == nil || len(members.GetLeader().GetClientUrls()) == 0 {
@@ -283,7 +307,7 @@ func (c *client) getOrCreateGRPCConn(addr string) (*grpc.ClientConn, error) {
 		return conn, nil
 	}
 
-	cc, err := grpcutil.GetClientConn(addr, c.security.CAPath, c.security.CertPath, c.security.KeyPath)
+	cc, err := grpcutil.GetClientConn(addr, c.security.CAPath, c.security.CertPath, c.security.KeyPath, c.gRPCDialOptions...)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}

client/client_test.go

@@ -469,6 +469,28 @@ func (s *testClientSuite) TestScatterRegion(c *C) {
 	c.Succeed()
 }
 
+func (s *testClientSuite) TestUpdateURLs(c *C) {
+	members := []*pdpb.Member{
+		{Name: "pd4", ClientUrls: []string{"tmp//pd4"}},
+		{Name: "pd1", ClientUrls: []string{"tmp//pd1"}},
+		{Name: "pd3", ClientUrls: []string{"tmp//pd3"}},
+		{Name: "pd2", ClientUrls: []string{"tmp//pd2"}},
+	}
+	getURLs := func(ms []*pdpb.Member) (urls []string) {
+		for _, m := range ms {
+			urls = append(urls, m.GetClientUrls()[0])
+		}
+		return
+	}
+	cli := &client{}
+	cli.updateURLs(members[1:])
+	c.Assert(cli.urls, DeepEquals, getURLs([]*pdpb.Member{members[1], members[3], members[2]}))
+	cli.updateURLs(members[1:])
+	c.Assert(cli.urls, DeepEquals, getURLs([]*pdpb.Member{members[1], members[3], members[2]}))
+	cli.updateURLs(members)
+	c.Assert(cli.urls, DeepEquals, getURLs([]*pdpb.Member{members[1], members[3], members[2], members[0]}))
+}
+
 var _ = Suite(&testClientCtxSuite{})
 
 type testClientCtxSuite struct{}
@@ -481,3 +503,17 @@ func (s *testClientCtxSuite) TestClientCtx(c *C) {
 	c.Assert(err, NotNil)
 	c.Assert(time.Since(start), Less, time.Second*4)
 }
+
+var _ = Suite(&testClientDialOptionSuite{})
+
+type testClientDialOptionSuite struct{}
+
+func (s *testClientDialOptionSuite) TestGRPCDialOption(c *C) {
+	start := time.Now()
+	ctx, cancel := context.WithTimeout(context.TODO(), 100*time.Millisecond)
+	defer cancel()
+	// nolint
+	_, err := NewClientWithContext(ctx, []string{"localhost:8080"}, SecurityOption{}, WithGRPCDialOptions(grpc.WithBlock(), grpc.WithTimeout(time.Second)))
+	c.Assert(err, NotNil)
+	c.Assert(time.Since(start), Greater, 800*time.Millisecond)
+}