拆分聊天 Handler 文件职责

backend/internal/modules/chat/handler_error.go

@@ -0,0 +1,25 @@
+package chat
+
+import (
+	"errors"
+	"net/http"
+
+	"hfb_sys/backend/pkg/response"
+
+	"github.com/gin-gonic/gin"
+)
+
+func writeChatError(c *gin.Context, err error) {
+	switch {
+	case errors.Is(err, ErrDependencyUnavailable):
+		response.ServiceUnavailable(c, "聊天服务暂时不可用")
+	case errors.Is(err, ErrConversationNotFound):
+		response.Error(c, http.StatusNotFound, "chat_not_found", "会话不存在")
+	case errors.Is(err, ErrPermissionDenied):
+		response.Error(c, http.StatusForbidden, "permission_denied", "无权访问该会话")
+	case errors.Is(err, ErrInvalidMessage):
+		response.BadRequest(c, "消息内容不符合规则")
+	default:
+		response.Error(c, http.StatusInternalServerError, "internal_error", "聊天服务暂时不可用")
+	}
+}