refactor: extract FlushWriter function for improved stream flushing

relay/helper/common.go

@@ -14,6 +14,14 @@ import (
 	"github.com/gorilla/websocket"
 )
 
+func FlushWriter(c *gin.Context) error {
+	if flusher, ok := c.Writer.(http.Flusher); ok {
+		flusher.Flush()
+		return nil
+	}
+	return errors.New("streaming error: flusher not found")
+}
+
 func SetEventStreamHeaders(c *gin.Context) {
 	// 检查是否已经设置过头部
 	if _, exists := c.Get("event_stream_headers_set"); exists {
@@ -38,49 +46,33 @@ func ClaudeData(c *gin.Context, resp dto.ClaudeResponse) error {
 		c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("event: %s\n", resp.Type)})
 		c.Render(-1, common.CustomEvent{Data: "data: " + string(jsonData)})
 	}
-	if flusher, ok := c.Writer.(http.Flusher); ok {
-		flusher.Flush()
-	} else {
-		return errors.New("streaming error: flusher not found")
-	}
+	_ = FlushWriter(c)
 	return nil
 }
 
 func ClaudeChunkData(c *gin.Context, resp dto.ClaudeResponse, data string) {
 	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("event: %s\n", resp.Type)})
 	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("data: %s\n", data)})
-	if flusher, ok := c.Writer.(http.Flusher); ok {
-		flusher.Flush()
-	}
+	_ = FlushWriter(c)
 }
 
 func ResponseChunkData(c *gin.Context, resp dto.ResponsesStreamResponse, data string) {
 	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("event: %s\n", resp.Type)})
 	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("data: %s", data)})
-	if flusher, ok := c.Writer.(http.Flusher); ok {
-		flusher.Flush()
-	}
+	_ = FlushWriter(c)
 }
 
 func StringData(c *gin.Context, str string) error {
 	//str = strings.TrimPrefix(str, "data: ")
 	//str = strings.TrimSuffix(str, "\r")
 	c.Render(-1, common.CustomEvent{Data: "data: " + str})
-	if flusher, ok := c.Writer.(http.Flusher); ok {
-		flusher.Flush()
-	} else {
-		return errors.New("streaming error: flusher not found")
-	}
+	_ = FlushWriter(c)
 	return nil
 }
 
 func PingData(c *gin.Context) error {
 	c.Writer.Write([]byte(": PING\n\n"))
-	if flusher, ok := c.Writer.(http.Flusher); ok {
-		flusher.Flush()
-	} else {
-		return errors.New("streaming error: flusher not found")
-	}
+	_ = FlushWriter(c)
 	return nil
 }