vendor: upgrade gRPC v1.13.0

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

vendor/google.golang.org/grpc/clientconn.go

@@ -32,11 +32,13 @@ import (
 	"golang.org/x/net/trace"
 	"google.golang.org/grpc/balancer"
 	_ "google.golang.org/grpc/balancer/roundrobin" // To register roundrobin.
-	"google.golang.org/grpc/channelz"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/internal/backoff"
+	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/resolver"
 	_ "google.golang.org/grpc/resolver/dns"         // To register dns resolver.
@@ -49,6 +51,8 @@ import (
 const (
 	// minimum time to give a connection to complete
 	minConnectTimeout = 20 * time.Second
+	// must match grpclbName in grpclb/grpclb.go
+	grpclbName = "grpclb"
 )
 
 var (
@@ -97,7 +101,7 @@ type dialOptions struct {
 	streamInt   StreamClientInterceptor
 	cp          Compressor
 	dc          Decompressor
-	bs          backoffStrategy
+	bs          backoff.Strategy
 	block       bool
 	insecure    bool
 	timeout     time.Duration
@@ -275,17 +279,17 @@ func WithBackoffMaxDelay(md time.Duration) DialOption {
 // Use WithBackoffMaxDelay until more parameters on BackoffConfig are opened up
 // for use.
 func WithBackoffConfig(b BackoffConfig) DialOption {
-	// Set defaults to ensure that provided BackoffConfig is valid and
-	// unexported fields get default values.
-	setDefaults(&b)
-	return withBackoff(b)
+
+	return withBackoff(backoff.Exponential{
+		MaxDelay: b.MaxDelay,
+	})
 }
 
 // withBackoff sets the backoff strategy used for connectRetryNum after a
 // failed connection attempt.
 //
 // This can be exported if arbitrary backoff strategies are allowed by gRPC.
-func withBackoff(bs backoffStrategy) DialOption {
+func withBackoff(bs backoff.Strategy) DialOption {
 	return func(o *dialOptions) {
 		o.bs = bs
 	}
@@ -340,6 +344,11 @@ func withContextDialer(f func(context.Context, string) (net.Conn, error)) DialOp
 	}
 }
 
+func init() {
+	internal.WithContextDialer = withContextDialer
+	internal.WithResolverBuilder = withResolverBuilder
+}
+
 // WithDialer returns a DialOption that specifies a function to use for dialing network addresses.
 // If FailOnNonTempDialError() is set to true, and an error is returned by f, gRPC checks the error's
 // Temporary() method to decide if it should try to reconnect to the network address.
@@ -532,7 +541,9 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}
 	if cc.dopts.bs == nil {
-		cc.dopts.bs = DefaultBackoffConfig
+		cc.dopts.bs = backoff.Exponential{
+			MaxDelay: DefaultBackoffConfig.MaxDelay,
+		}
 	}
 	if cc.dopts.resolverBuilder == nil {
 		// Only try to parse target when resolver builder is not already set.
@@ -1052,9 +1063,9 @@ func (cc *ClientConn) handleServiceConfig(js string) error {
 }
 
 func (cc *ClientConn) resolveNow(o resolver.ResolveNowOption) {
-	cc.mu.Lock()
+	cc.mu.RLock()
 	r := cc.resolverWrapper
-	cc.mu.Unlock()
+	cc.mu.RUnlock()
 	if r == nil {
 		return
 	}
@@ -1203,7 +1214,7 @@ func (ac *addrConn) resetTransport() error {
 			// This means either a successful HTTP2 connection was established
 			// or this is the first time this addrConn is trying to establish a
 			// connection.
-			backoffFor := ac.dopts.bs.backoff(connectRetryNum) // time.Duration.
+			backoffFor := ac.dopts.bs.Backoff(connectRetryNum) // time.Duration.
 			// This will be the duration that dial gets to finish.
 			dialDuration := getMinConnectTimeout()
 			if backoffFor > dialDuration {