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| 1 | +package gemini |
| 2 | + |
| 3 | +import ( |
| 4 | + "encoding/json" |
| 5 | + "io" |
| 6 | + "net/http" |
| 7 | + "one-api/common" |
| 8 | + "one-api/dto" |
| 9 | + relaycommon "one-api/relay/common" |
| 10 | + "one-api/relay/helper" |
| 11 | + "one-api/service" |
| 12 | + |
| 13 | + "github.com/gin-gonic/gin" |
| 14 | +) |
| 15 | + |
| 16 | +func GeminiTextGenerationHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo) (*dto.Usage, *dto.OpenAIErrorWithStatusCode) { |
| 17 | + // 读取响应体 |
| 18 | + responseBody, err := io.ReadAll(resp.Body) |
| 19 | + if err != nil { |
| 20 | + return nil, service.OpenAIErrorWrapper(err, "read_response_body_failed", http.StatusInternalServerError) |
| 21 | + } |
| 22 | + err = resp.Body.Close() |
| 23 | + if err != nil { |
| 24 | + return nil, service.OpenAIErrorWrapper(err, "close_response_body_failed", http.StatusInternalServerError) |
| 25 | + } |
| 26 | + |
| 27 | + if common.DebugEnabled { |
| 28 | + println(string(responseBody)) |
| 29 | + } |
| 30 | + |
| 31 | + // 解析为 Gemini 原生响应格式 |
| 32 | + var geminiResponse GeminiChatResponse |
| 33 | + err = common.DecodeJson(responseBody, &geminiResponse) |
| 34 | + if err != nil { |
| 35 | + return nil, service.OpenAIErrorWrapper(err, "unmarshal_response_body_failed", http.StatusInternalServerError) |
| 36 | + } |
| 37 | + |
| 38 | + // 检查是否有候选响应 |
| 39 | + if len(geminiResponse.Candidates) == 0 { |
| 40 | + return nil, &dto.OpenAIErrorWithStatusCode{ |
| 41 | + Error: dto.OpenAIError{ |
| 42 | + Message: "No candidates returned", |
| 43 | + Type: "server_error", |
| 44 | + Param: "", |
| 45 | + Code: 500, |
| 46 | + }, |
| 47 | + StatusCode: resp.StatusCode, |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + // 计算使用量（基于 UsageMetadata） |
| 52 | + usage := dto.Usage{ |
| 53 | + PromptTokens: geminiResponse.UsageMetadata.PromptTokenCount, |
| 54 | + CompletionTokens: geminiResponse.UsageMetadata.CandidatesTokenCount, |
| 55 | + TotalTokens: geminiResponse.UsageMetadata.TotalTokenCount, |
| 56 | + } |
| 57 | + |
| 58 | + // 直接返回 Gemini 原生格式的 JSON 响应 |
| 59 | + jsonResponse, err := json.Marshal(geminiResponse) |
| 60 | + if err != nil { |
| 61 | + return nil, service.OpenAIErrorWrapper(err, "marshal_response_body_failed", http.StatusInternalServerError) |
| 62 | + } |
| 63 | + |
| 64 | + // 设置响应头并写入响应 |
| 65 | + c.Writer.Header().Set("Content-Type", "application/json") |
| 66 | + c.Writer.WriteHeader(resp.StatusCode) |
| 67 | + _, err = c.Writer.Write(jsonResponse) |
| 68 | + if err != nil { |
| 69 | + return nil, service.OpenAIErrorWrapper(err, "write_response_failed", http.StatusInternalServerError) |
| 70 | + } |
| 71 | + |
| 72 | + return &usage, nil |
| 73 | +} |
| 74 | + |
| 75 | +func GeminiTextGenerationStreamHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo) (*dto.Usage, *dto.OpenAIErrorWithStatusCode) { |
| 76 | + var usage = &dto.Usage{} |
| 77 | + var imageCount int |
| 78 | + |
| 79 | + helper.SetEventStreamHeaders(c) |
| 80 | + |
| 81 | + helper.StreamScannerHandler(c, resp, info, func(data string) bool { |
| 82 | + var geminiResponse GeminiChatResponse |
| 83 | + err := common.DecodeJsonStr(data, &geminiResponse) |
| 84 | + if err != nil { |
| 85 | + common.LogError(c, "error unmarshalling stream response: "+err.Error()) |
| 86 | + return false |
| 87 | + } |
| 88 | + |
| 89 | + // 统计图片数量 |
| 90 | + for _, candidate := range geminiResponse.Candidates { |
| 91 | + for _, part := range candidate.Content.Parts { |
| 92 | + if part.InlineData != nil && part.InlineData.MimeType != "" { |
| 93 | + imageCount++ |
| 94 | + } |
| 95 | + } |
| 96 | + } |
| 97 | + |
| 98 | + // 更新使用量统计 |
| 99 | + if geminiResponse.UsageMetadata.TotalTokenCount != 0 { |
| 100 | + usage.PromptTokens = geminiResponse.UsageMetadata.PromptTokenCount |
| 101 | + usage.CompletionTokens = geminiResponse.UsageMetadata.CandidatesTokenCount |
| 102 | + usage.TotalTokens = geminiResponse.UsageMetadata.TotalTokenCount |
| 103 | + } |
| 104 | + |
| 105 | + // 直接发送 GeminiChatResponse 响应 |
| 106 | + err = helper.ObjectData(c, geminiResponse) |
| 107 | + if err != nil { |
| 108 | + common.LogError(c, err.Error()) |
| 109 | + } |
| 110 | + |
| 111 | + return true |
| 112 | + }) |
| 113 | + |
| 114 | + if imageCount != 0 { |
| 115 | + if usage.CompletionTokens == 0 { |
| 116 | + usage.CompletionTokens = imageCount * 258 |
| 117 | + } |
| 118 | + } |
| 119 | + |
| 120 | + // 计算最终使用量 |
| 121 | + usage.PromptTokensDetails.TextTokens = usage.PromptTokens |
| 122 | + usage.CompletionTokens = usage.TotalTokens - usage.PromptTokens |
| 123 | + |
| 124 | + // 结束流式响应 |
| 125 | + helper.Done(c) |
| 126 | + |
| 127 | + return usage, nil |
| 128 | +} |
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