feat: update Gemini API response handling to include block reason and improve error reporting

dto/gemini.go

@@ -293,12 +293,13 @@ type GeminiChatSafetyRating struct {
 
 type GeminiChatPromptFeedback struct {
 	SafetyRatings []GeminiChatSafetyRating `json:"safetyRatings"`
+	BlockReason   *string                  `json:"blockReason,omitempty"`
 }
 
 type GeminiChatResponse struct {
-	Candidates     []GeminiChatCandidate    `json:"candidates"`
-	PromptFeedback GeminiChatPromptFeedback `json:"promptFeedback"`
-	UsageMetadata  GeminiUsageMetadata      `json:"usageMetadata"`
+	Candidates     []GeminiChatCandidate     `json:"candidates"`
+	PromptFeedback *GeminiChatPromptFeedback `json:"promptFeedback,omitempty"`
+	UsageMetadata  GeminiUsageMetadata       `json:"usageMetadata"`
 }
 
 type GeminiUsageMetadata struct {

relay/channel/gemini/relay-gemini.go

@@ -1050,7 +1050,12 @@ func GeminiChatHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.R
 		return nil, types.NewOpenAIError(err, types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
 	}
 	if len(geminiResponse.Candidates) == 0 {
-		return nil, types.NewOpenAIError(errors.New("no candidates returned"), types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
+		//return nil, types.NewOpenAIError(errors.New("no candidates returned"), types.ErrorCodeBadResponseBody, http.StatusInternalServerError)
+		if geminiResponse.PromptFeedback != nil && geminiResponse.PromptFeedback.BlockReason != nil {
+			return nil, types.NewOpenAIError(errors.New("request blocked by Gemini API: "+*geminiResponse.PromptFeedback.BlockReason), types.ErrorCodePromptBlocked, http.StatusBadRequest)
+		} else {
+			return nil, types.NewOpenAIError(errors.New("empty response from Gemini API"), types.ErrorCodeEmptyResponse, http.StatusInternalServerError)
+		}
 	}
 	fullTextResponse := responseGeminiChat2OpenAI(c, &geminiResponse)
 	fullTextResponse.Model = info.UpstreamModelName

service/convert.go

@@ -636,9 +636,6 @@ func extractTextFromGeminiParts(parts []dto.GeminiPart) string {
 func ResponseOpenAI2Gemini(openAIResponse *dto.OpenAITextResponse, info *relaycommon.RelayInfo) *dto.GeminiChatResponse {
 	geminiResponse := &dto.GeminiChatResponse{
 		Candidates: make([]dto.GeminiChatCandidate, 0, len(openAIResponse.Choices)),
-		PromptFeedback: dto.GeminiChatPromptFeedback{
-			SafetyRatings: []dto.GeminiChatSafetyRating{},
-		},
 		UsageMetadata: dto.GeminiUsageMetadata{
 			PromptTokenCount:     openAIResponse.PromptTokens,
 			CandidatesTokenCount: openAIResponse.CompletionTokens,
@@ -735,9 +732,6 @@ func StreamResponseOpenAI2Gemini(openAIResponse *dto.ChatCompletionsStreamRespon
 
 	geminiResponse := &dto.GeminiChatResponse{
 		Candidates: make([]dto.GeminiChatCandidate, 0, len(openAIResponse.Choices)),
-		PromptFeedback: dto.GeminiChatPromptFeedback{
-			SafetyRatings: []dto.GeminiChatSafetyRating{},
-		},
 		UsageMetadata: dto.GeminiUsageMetadata{
 			PromptTokenCount:     info.PromptTokens,
 			CandidatesTokenCount: 0, // 流式响应中可能没有完整的 usage 信息

types/error.go

@@ -69,6 +69,7 @@ const (
 	ErrorCodeEmptyResponse          ErrorCode = "empty_response"
 	ErrorCodeAwsInvokeError         ErrorCode = "aws_invoke_error"
 	ErrorCodeModelNotFound          ErrorCode = "model_not_found"
+	ErrorCodePromptBlocked          ErrorCode = "prompt_blocked"
 
 	// sql error
 	ErrorCodeQueryDataError  ErrorCode = "query_data_error"