Add helpers to set libinfo without panic (#2724)

* add helpers to set library name and library info without risk of panic if we try to set both

* refactor code to use helpers

* add example

* refactor tests

* fix testable example

* simplify example

* rename exampl

* fix ring.go

* update example

---------

Co-authored-by: ofekshenawa <104765379+ofekshenawa@users.noreply.github.com>

Author: peczenyj

command.go

@@ -5310,6 +5310,16 @@ type LibraryInfo struct {
 	LibVer  *string
 }
 
+// WithLibraryName returns a valid LibraryInfo with library name only.
+func WithLibraryName(libName string) LibraryInfo {
+	return LibraryInfo{LibName: &libName}
+}
+
+// WithLibraryVersion returns a valid LibraryInfo with library version only.
+func WithLibraryVersion(libVer string) LibraryInfo {
+	return LibraryInfo{LibVer: &libVer}
+}
+
 // -------------------------------------------
 
 type InfoCmd struct {

commands_test.go

@@ -248,7 +248,7 @@ var _ = Describe("Commands", func() {
 
 			// Test setting the libName
 			libName := "go-redis"
-			libInfo := redis.LibraryInfo{LibName: &libName}
+			libInfo := redis.WithLibraryName(libName)
 			setInfo := pipe.ClientSetInfo(ctx, libInfo)
 			_, err := pipe.Exec(ctx)
 
@@ -258,7 +258,7 @@ var _ = Describe("Commands", func() {
 
 			// Test setting the libVer
 			libVer := "vX.x"
-			libInfo = redis.LibraryInfo{LibVer: &libVer}
+			libInfo = redis.WithLibraryVersion(libVer)
 			setInfo = pipe.ClientSetInfo(ctx, libInfo)
 			_, err = pipe.Exec(ctx)
 

example_test.go

@@ -154,7 +154,7 @@ func ExampleClient() {
 	// missing_key does not exist
 }
 
-func ExampleConn() {
+func ExampleConn_name() {
 	conn := rdb.Conn()
 
 	err := conn.ClientSetName(ctx, "foobar").Err()
@@ -175,6 +175,28 @@ func ExampleConn() {
 	// Output: foobar
 }
 
+func ExampleConn_client_setInfo_libraryVersion() {
+	conn := rdb.Conn()
+
+	err := conn.ClientSetInfo(ctx, redis.WithLibraryVersion("1.2.3")).Err()
+	if err != nil {
+		panic(err)
+	}
+
+	// Open other connections.
+	for i := 0; i < 10; i++ {
+		go rdb.Ping(ctx)
+	}
+
+	s, err := conn.ClientInfo(ctx).Result()
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println(s.LibVer)
+	// Output: 1.2.3
+}
+
 func ExampleClient_Set() {
 	// Last argument is expiration. Zero means the key has no
 	// expiration time.

redis.go

@@ -315,13 +315,12 @@ func (c *baseClient) initConn(ctx context.Context, cn *pool.Conn) error {
 	if !c.opt.DisableIndentity {
 		libName := ""
 		libVer := Version()
+
 		if c.opt.IdentitySuffix != "" {
 			libName = c.opt.IdentitySuffix
 		}
-		libInfo := LibraryInfo{LibName: &libName}
-		conn.ClientSetInfo(ctx, libInfo)
-		libInfo = LibraryInfo{LibVer: &libVer}
-		conn.ClientSetInfo(ctx, libInfo)
+		conn.ClientSetInfo(ctx,  WithLibraryName(libName))
+		conn.ClientSetInfo(ctx, WithLibraryVersion(libVer))
 	}
 	_, err := conn.Pipelined(ctx, func(pipe Pipeliner) error {
 		if !auth && password != "" {