optimize code of init rabbitmq connect func

mq/rabbitmq_init.go

@@ -48,9 +48,9 @@ func GetConn() *amqp.Connection {
 // InitRabbitProxy return instance of rabbitMQ connection
 func InitRabbitProxy(ctx context.Context, rCfg config.RabbitMQConfig) *RabbitMQProxy {
 	amqpURI := generateRabbitMQURI(rCfg)
-	certConf, err := readCertFiles(ctx, rCfg)
+	certConf, err := initCertConf(rCfg)
 	if err != nil {
-		logger.Error(ctx, "read rabbitMQ cert files failed", "error", err)
+		logger.Error(ctx, "init rabbitMQ cert config failed", "error", err)
 		panic(err)
 	}
 	rabbitMQOnce.Do(func() {
@@ -63,7 +63,7 @@ func InitRabbitProxy(ctx context.Context, rCfg config.RabbitMQConfig) *RabbitMQP
 
 // initRabbitMQ return instance of rabbitMQ connection
 func initRabbitMQ(ctx context.Context, rabbitMQURI string, certConf *RabbitMQCertConf) *amqp.Connection {
-	logger.Info(ctx, fmt.Sprintf("connecting to rabbitMQ server at: %s", rabbitMQURI))
+	logger.Info(ctx, "connecting to rabbitMQ server", "rabbit_uri", rabbitMQURI)
 
 	tlsConfig := &tls.Config{
 		Certificates:       []tls.Certificate{certConf.clientCert},
@@ -78,7 +78,7 @@ func initRabbitMQ(ctx context.Context, rabbitMQURI string, certConf *RabbitMQCer
 		Heartbeat:       10 * time.Second,
 	})
 	if err != nil {
-		logger.Error(ctx, "Error opening connection: ", "error", err)
+		logger.Error(ctx, "init rabbitMQ connection failed", "error", err)
 	}
 	defer conn.Close()
 
@@ -131,55 +131,54 @@ func generateRabbitMQURI(rCfg config.RabbitMQConfig) string {
 	return amqpURI
 }
 
-func readCertFiles(ctx context.Context, rCfg config.RabbitMQConfig) (*RabbitMQCertConf, error) {
+func initCertConf(rCfg config.RabbitMQConfig) (*RabbitMQCertConf, error) {
-	var initFailedFlag bool
+	certConf := &RabbitMQCertConf{
-	certConf := RabbitMQCertConf{
 		insecureSkipVerify: rCfg.InsecureSkipVerify,
+		serverName:         rCfg.ServerName,
 	}
 
 	caCert, err := os.ReadFile(rCfg.CACertPath)
 	if err != nil {
-		logger.Error(ctx, "read server ca file failed", "error", err)
+		return nil, fmt.Errorf("read server ca file failed: %w", err)
-		initFailedFlag = true
 	}
 	caCertPool := x509.NewCertPool()
-	caCertPool.AppendCertsFromPEM(caCert)
+	if ok := caCertPool.AppendCertsFromPEM(caCert); !ok {
+		return nil, fmt.Errorf("failed to parse root certificate from %s", rCfg.CACertPath)
+	}
 	certConf.caCertPool = caCertPool
 
-	keyData, err := os.ReadFile(rCfg.ClientKeyPath)
-	if err != nil {
-		logger.Error(ctx, "read private key file failed", "error", err)
-		initFailedFlag = true
-	}
-
-	block, _ := pem.Decode(keyData)
-	privateKey, err := pkcs8.ParsePKCS8PrivateKey(block.Bytes, []byte(rCfg.ClientKeyPassword))
-	if err != nil {
-		logger.Error(ctx, "parse private key failed", "error", err)
-		initFailedFlag = true
-	}
-
-	pemBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
-	if err != nil {
-		logger.Error(ctx, "parse private key failed", "error", err)
-		initFailedFlag = true
-	}
-	pemBlock := &pem.Block{Type: "PRIVATE KEY", Bytes: pemBytes}
-
 	certPEM, err := os.ReadFile(rCfg.ClientCertPath)
 	if err != nil {
-		logger.Error(ctx, "parse private key failed", "error", err)
+		return nil, fmt.Errorf("read client cert file failed: %w", err)
-		initFailedFlag = true
 	}
-	clientCert, err := tls.X509KeyPair(certPEM, pem.EncodeToMemory(pemBlock))
+
+	keyData, err := os.ReadFile(rCfg.ClientKeyPath)
 	if err != nil {
-		logger.Error(ctx, "load client cert failed", "error", err)
+		return nil, fmt.Errorf("read private key file failed: %w", err)
-		initFailedFlag = true
 	}
-	certConf.serverName = rCfg.ServerName
+
+	block, _ := pem.Decode(keyData)
+	if block == nil {
+		return nil, fmt.Errorf("failed to decode PEM block from private key")
+	}
+
+	der, err := pkcs8.ParsePKCS8PrivateKey(block.Bytes, []byte(rCfg.ClientKeyPassword))
+	if err != nil {
+		return nil, fmt.Errorf("parse password-protected private key failed: %w", err)
+	}
+
+	privBytes, err := x509.MarshalPKCS8PrivateKey(der)
+	if err != nil {
+		return nil, fmt.Errorf("marshal private key failed: %w", err)
+	}
+
+	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes})
+
+	clientCert, err := tls.X509KeyPair(certPEM, keyPEM)
+	if err != nil {
+		return nil, fmt.Errorf("create x509 key pair failed: %w", err)
+	}
+
 	certConf.clientCert = clientCert
-	if initFailedFlag {
+	return certConf, nil
-		return nil, fmt.Errorf("rabbitMQ cert files init failed")
-	}
-	return &certConf, nil
 }