feat: update ali stream implementation & enable internet search (#856)

* Update relay-ali.go: 改进stream模式，添加联网搜索能力

通义千问支持stream的增量模式，不需要每次去掉上次的前缀；实测qwen-max联网模式效果不错，添加了联网模式。如果别的模型有问题可以改为单独给qwen-max开放

* 删除"stream参数"

刚发现原来阿里api没有这个参数，上次误加了。

* refactor: only enable search when specified

* fix: remove custom suffix when get model ratio

---------

Co-authored-by: JustSong <songquanpeng@foxmail.com>

controller/relay-ali.go

@@ -23,10 +23,11 @@ type AliInput struct {
 }
 
 type AliParameters struct {
-	TopP         float64 `json:"top_p,omitempty"`
-	TopK         int     `json:"top_k,omitempty"`
-	Seed         uint64  `json:"seed,omitempty"`
-	EnableSearch bool    `json:"enable_search,omitempty"`
+	TopP              float64 `json:"top_p,omitempty"`
+	TopK              int     `json:"top_k,omitempty"`
+	Seed              uint64  `json:"seed,omitempty"`
+	EnableSearch      bool    `json:"enable_search,omitempty"`
+	IncrementalOutput bool    `json:"incremental_output,omitempty"`
 }
 
 type AliChatRequest struct {
@@ -81,6 +82,8 @@ type AliChatResponse struct {
 	AliError
 }
 
+const AliEnableSearchModelSuffix = "-internet"
+
 func requestOpenAI2Ali(request GeneralOpenAIRequest) *AliChatRequest {
 	messages := make([]AliMessage, 0, len(request.Messages))
 	for i := 0; i < len(request.Messages); i++ {
@@ -90,17 +93,21 @@ func requestOpenAI2Ali(request GeneralOpenAIRequest) *AliChatRequest {
 			Role:    strings.ToLower(message.Role),
 		})
 	}
+	enableSearch := false
+	aliModel := request.Model
+	if strings.HasSuffix(aliModel, AliEnableSearchModelSuffix) {
+		enableSearch = true
+		aliModel = strings.TrimSuffix(aliModel, AliEnableSearchModelSuffix)
+	}
 	return &AliChatRequest{
-		Model: request.Model,
+		Model: aliModel,
 		Input: AliInput{
 			Messages: messages,
 		},
-		//Parameters: AliParameters{  // ChatGPT's parameters are not compatible with Ali's
-		//	TopP: request.TopP,
-		//	TopK: 50,
-		//	//Seed:         0,
-		//	//EnableSearch: false,
-		//},
+		Parameters: AliParameters{
+			EnableSearch:      enableSearch,
+			IncrementalOutput: request.Stream,
+		},
 	}
 }
 
@@ -202,7 +209,7 @@ func streamResponseAli2OpenAI(aliResponse *AliChatResponse) *ChatCompletionsStre
 		Id:      aliResponse.RequestId,
 		Object:  "chat.completion.chunk",
 		Created: common.GetTimestamp(),
-		Model:   "ernie-bot",
+		Model:   "qwen",
 		Choices: []ChatCompletionsStreamResponseChoice{choice},
 	}
 	return &response
@@ -240,7 +247,7 @@ func aliStreamHandler(c *gin.Context, resp *http.Response) (*OpenAIErrorWithStat
 		stopChan <- true
 	}()
 	setEventStreamHeaders(c)
-	lastResponseText := ""
+	//lastResponseText := ""
 	c.Stream(func(w io.Writer) bool {
 		select {
 		case data := <-dataChan:
@@ -256,8 +263,8 @@ func aliStreamHandler(c *gin.Context, resp *http.Response) (*OpenAIErrorWithStat
 				usage.TotalTokens = aliResponse.Usage.InputTokens + aliResponse.Usage.OutputTokens
 			}
 			response := streamResponseAli2OpenAI(&aliResponse)
-			response.Choices[0].Delta.Content = strings.TrimPrefix(response.Choices[0].Delta.Content, lastResponseText)
-			lastResponseText = aliResponse.Output.Text
+			//response.Choices[0].Delta.Content = strings.TrimPrefix(response.Choices[0].Delta.Content, lastResponseText)
+			//lastResponseText = aliResponse.Output.Text
 			jsonResponse, err := json.Marshal(response)
 			if err != nil {
 				common.SysError("error marshalling stream response: " + err.Error())