fix: gemini stream finish reason (close #378)

relay/channel/gemini/relay-gemini.go

@@ -198,7 +198,6 @@ func streamResponseGeminiChat2OpenAI(geminiResponse *GeminiChatResponse) *dto.Ch
 			choice.Delta.SetContentString(respFirst.Text)
 		}
 	}
-	choice.FinishReason = &relaycommon.StopFinishReason
 	var response dto.ChatCompletionsStreamResponse
 	response.Object = "chat.completion.chunk"
 	response.Model = "gemini"
@@ -247,10 +246,14 @@ func geminiChatStreamHandler(c *gin.Context, resp *http.Response, info *relaycom
 			common.LogError(c, err.Error())
 		}
 	}
+
+	response := service.GenerateStopResponse(id, createAt, info.UpstreamModelName, relaycommon.StopFinishReason)
+	service.ObjectData(c, response)
+
 	usage.TotalTokens = usage.PromptTokens + usage.CompletionTokens
 
 	if info.ShouldIncludeUsage {
-		response := service.GenerateFinalUsageResponse(id, createAt, info.UpstreamModelName, *usage)
+		response = service.GenerateFinalUsageResponse(id, createAt, info.UpstreamModelName, *usage)
 		err := service.ObjectData(c, response)
 		if err != nil {
 			common.SysError("send final response failed: " + err.Error())

service/relay.go

@@ -7,6 +7,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"net/http"
 	"one-api/common"
+	"one-api/dto"
 )
 
 func SetEventStreamHeaders(c *gin.Context) {
@@ -45,3 +46,30 @@ func GetResponseID(c *gin.Context) string {
 	logID := c.GetString("X-Oneapi-Request-Id")
 	return fmt.Sprintf("chatcmpl-%s", logID)
 }
+
+func GenerateStopResponse(id string, createAt int64, model string, finishReason string) *dto.ChatCompletionsStreamResponse {
+	return &dto.ChatCompletionsStreamResponse{
+		Id:                id,
+		Object:            "chat.completion.chunk",
+		Created:           createAt,
+		Model:             model,
+		SystemFingerprint: nil,
+		Choices: []dto.ChatCompletionsStreamResponseChoice{
+			{
+				FinishReason: &finishReason,
+			},
+		},
+	}
+}
+
+func GenerateFinalUsageResponse(id string, createAt int64, model string, usage dto.Usage) *dto.ChatCompletionsStreamResponse {
+	return &dto.ChatCompletionsStreamResponse{
+		Id:                id,
+		Object:            "chat.completion.chunk",
+		Created:           createAt,
+		Model:             model,
+		SystemFingerprint: nil,
+		Choices:           make([]dto.ChatCompletionsStreamResponseChoice, 0),
+		Usage:             &usage,
+	}
+}

service/usage_helpr.go

@@ -25,18 +25,6 @@ func ResponseText2Usage(responseText string, modeName string, promptTokens int)
 	return usage, err
 }
 
-func GenerateFinalUsageResponse(id string, createAt int64, model string, usage dto.Usage) *dto.ChatCompletionsStreamResponse {
-	return &dto.ChatCompletionsStreamResponse{
-		Id:                id,
-		Object:            "chat.completion.chunk",
-		Created:           createAt,
-		Model:             model,
-		SystemFingerprint: nil,
-		Choices:           make([]dto.ChatCompletionsStreamResponseChoice, 0),
-		Usage:             &usage,
-	}
-}
-
 func ValidUsage(usage *dto.Usage) bool {
 	return usage != nil && (usage.PromptTokens != 0 || usage.CompletionTokens != 0)
 }