Set client name in HELLO RESP handshake (#3294)

redis.go

@@ -310,7 +310,7 @@ func (c *baseClient) initConn(ctx context.Context, cn *pool.Conn) error {
 
 	// for redis-server versions that do not support the HELLO command,
 	// RESP2 will continue to be used.
-	if err = conn.Hello(ctx, protocol, username, password, "").Err(); err == nil {
+	if err = conn.Hello(ctx, protocol, username, password, c.opt.ClientName).Err(); err == nil {
 		auth = true
 	} else if !isRedisError(err) {
 		// When the server responds with the RESP protocol and the result is not a normal

redis_test.go

@@ -186,6 +186,32 @@ var _ = Describe("Client", func() {
 		Expect(val).Should(ContainSubstring("name=hi"))
 	})
 
+	It("should attempt to set client name in HELLO", func() {
+		opt := redisOptions()
+		opt.ClientName = "hi"
+		db := redis.NewClient(opt)
+
+		defer func() {
+			Expect(db.Close()).NotTo(HaveOccurred())
+		}()
+
+		// Client name should be already set on any successfully initialized connection
+		name, err := db.ClientGetName(ctx).Result()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(name).Should(Equal("hi"))
+
+		// HELLO should be able to explicitly overwrite the client name
+		conn := db.Conn()
+		hello, err := conn.Hello(ctx, 3, "", "", "hi2").Result()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(hello["proto"]).Should(Equal(int64(3)))
+		name, err = conn.ClientGetName(ctx).Result()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(name).Should(Equal("hi2"))
+		err = conn.Close()
+		Expect(err).NotTo(HaveOccurred())
+	})
+
 	It("should client PROTO 2", func() {
 		opt := redisOptions()
 		opt.Protocol = 2