tools/tso: add option useTSOServerProxy in pd-tso-bench (#7756)

ref #8135

Signed-off-by: lhy1024 <admin@liudos.us>

Co-authored-by: Hu# <jinhao.hu@pingcap.com>
Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>

client/client.go

@@ -268,6 +268,15 @@ func WithForwardingOption(enableForwarding bool) ClientOption {
 	}
 }
 
+// WithTSOServerProxyOption configures the client to use TSO server proxy,
+// i.e., the client will send TSO requests to the API leader (the TSO server
+// proxy) which will forward the requests to the TSO servers.
+func WithTSOServerProxyOption(useTSOServerProxy bool) ClientOption {
+	return func(c *client) {
+		c.option.useTSOServerProxy = useTSOServerProxy
+	}
+}
+
 // WithMaxErrorRetry configures the client max retry times when connect meets error.
 func WithMaxErrorRetry(count int) ClientOption {
 	return func(c *client) {
@@ -648,6 +657,11 @@ func (c *client) setServiceMode(newMode pdpb.ServiceMode) {
 	c.Lock()
 	defer c.Unlock()
 
+	if c.option.useTSOServerProxy {
+		// If we are using TSO server proxy, we always use PD_SVC_MODE.
+		newMode = pdpb.ServiceMode_PD_SVC_MODE
+	}
+
 	if newMode == c.serviceMode {
 		return
 	}

client/option.go

@@ -51,12 +51,13 @@ const (
 // It provides the ability to change some PD client's options online from the outside.
 type option struct {
 	// Static options.
-	gRPCDialOptions  []grpc.DialOption
-	timeout          time.Duration
-	maxRetryTimes    int
-	enableForwarding bool
-	metricsLabels    prometheus.Labels
-	initMetrics      bool
+	gRPCDialOptions   []grpc.DialOption
+	timeout           time.Duration
+	maxRetryTimes     int
+	enableForwarding  bool
+	useTSOServerProxy bool
+	metricsLabels     prometheus.Labels
+	initMetrics       bool
 
 	// Dynamic options.
 	dynamicOptions [dynamicOptionCount]atomic.Value

tools/pd-tso-bench/main.go

@@ -62,6 +62,7 @@ var (
 	maxTSOSendIntervalMilliseconds = flag.Int("max-send-interval-ms", 0, "max tso send interval in milliseconds, 60s by default")
 	keyspaceID                     = flag.Uint("keyspace-id", 0, "the id of the keyspace to access")
 	keyspaceName                   = flag.String("keyspace-name", "", "the name of the keyspace to access")
+	useTSOServerProxy              = flag.Bool("use-tso-server-proxy", false, "whether send tso requests to tso server proxy instead of tso service directly")
 	wg                             sync.WaitGroup
 )
 
@@ -424,6 +425,9 @@ func createPDClient(ctx context.Context) (pd.Client, error) {
 	)
 
 	opts := make([]pd.ClientOption, 0)
+	if *useTSOServerProxy {
+		opts = append(opts, pd.WithTSOServerProxyOption(true))
+	}
 	opts = append(opts, pd.WithGRPCDialOptions(
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time:    keepaliveTime,