feat: 实现 Antigravity Claude → Gemini 协议转换，haiku 映射到 gemini-3-flash
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song
269
backend/internal/pkg/antigravity/response_transformer.go
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269
backend/internal/pkg/antigravity/response_transformer.go
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@@ -0,0 +1,269 @@
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package antigravity
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import (
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"encoding/json"
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"fmt"
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)
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// TransformGeminiToClaude 将 Gemini 响应转换为 Claude 格式（非流式）
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func TransformGeminiToClaude(geminiResp []byte, originalModel string) ([]byte, *ClaudeUsage, error) {
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// 解包 v1internal 响应
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var v1Resp V1InternalResponse
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if err := json.Unmarshal(geminiResp, &v1Resp); err != nil {
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// 尝试直接解析为 GeminiResponse
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var directResp GeminiResponse
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if err2 := json.Unmarshal(geminiResp, &directResp); err2 != nil {
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return nil, nil, fmt.Errorf("parse gemini response: %w", err)
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}
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v1Resp.Response = directResp
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v1Resp.ResponseID = directResp.ResponseID
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v1Resp.ModelVersion = directResp.ModelVersion
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}
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// 使用处理器转换
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processor := NewNonStreamingProcessor()
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claudeResp := processor.Process(&v1Resp.Response, v1Resp.ResponseID, originalModel)
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// 序列化
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respBytes, err := json.Marshal(claudeResp)
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if err != nil {
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return nil, nil, fmt.Errorf("marshal claude response: %w", err)
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}
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return respBytes, &claudeResp.Usage, nil
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}
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// NonStreamingProcessor 非流式响应处理器
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type NonStreamingProcessor struct {
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contentBlocks []ClaudeContentItem
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textBuilder string
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thinkingBuilder string
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thinkingSignature string
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trailingSignature string
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hasToolCall bool
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}
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// NewNonStreamingProcessor 创建非流式响应处理器
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func NewNonStreamingProcessor() *NonStreamingProcessor {
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return &NonStreamingProcessor{
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contentBlocks: make([]ClaudeContentItem, 0),
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}
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}
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// Process 处理 Gemini 响应
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func (p *NonStreamingProcessor) Process(geminiResp *GeminiResponse, responseID, originalModel string) *ClaudeResponse {
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// 获取 parts
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var parts []GeminiPart
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if len(geminiResp.Candidates) > 0 && geminiResp.Candidates[0].Content != nil {
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parts = geminiResp.Candidates[0].Content.Parts
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}
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// 处理所有 parts
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for _, part := range parts {
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p.processPart(&part)
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}
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// 刷新剩余内容
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p.flushThinking()
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p.flushText()
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// 处理 trailingSignature
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if p.trailingSignature != "" {
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: "",
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Signature: p.trailingSignature,
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})
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}
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// 构建响应
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return p.buildResponse(geminiResp, responseID, originalModel)
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}
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// processPart 处理单个 part
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func (p *NonStreamingProcessor) processPart(part *GeminiPart) {
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signature := part.ThoughtSignature
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// 1. FunctionCall 处理
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if part.FunctionCall != nil {
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p.flushThinking()
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p.flushText()
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// 处理 trailingSignature
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if p.trailingSignature != "" {
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: "",
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Signature: p.trailingSignature,
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})
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p.trailingSignature = ""
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}
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p.hasToolCall = true
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// 生成 tool_use id
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toolID := part.FunctionCall.ID
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if toolID == "" {
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toolID = fmt.Sprintf("%s-%s", part.FunctionCall.Name, generateRandomID())
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}
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item := ClaudeContentItem{
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Type: "tool_use",
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ID: toolID,
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Name: part.FunctionCall.Name,
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Input: part.FunctionCall.Args,
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}
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if signature != "" {
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item.Signature = signature
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}
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p.contentBlocks = append(p.contentBlocks, item)
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return
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}
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// 2. Text 处理
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if part.Text != "" || part.Thought {
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if part.Thought {
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// Thinking part
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p.flushText()
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// 处理 trailingSignature
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if p.trailingSignature != "" {
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p.flushThinking()
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: "",
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Signature: p.trailingSignature,
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})
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p.trailingSignature = ""
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}
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p.thinkingBuilder += part.Text
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if signature != "" {
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p.thinkingSignature = signature
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}
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} else {
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// 普通 Text
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if part.Text == "" {
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// 空 text 带签名 - 暂存
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if signature != "" {
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p.trailingSignature = signature
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}
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return
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}
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p.flushThinking()
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// 处理之前的 trailingSignature
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if p.trailingSignature != "" {
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p.flushText()
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: "",
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Signature: p.trailingSignature,
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})
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p.trailingSignature = ""
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}
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p.textBuilder += part.Text
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// 非空 text 带签名 - 立即刷新并输出空 thinking 块
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if signature != "" {
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p.flushText()
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: "",
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Signature: signature,
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})
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}
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}
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}
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// 3. InlineData (Image) 处理
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if part.InlineData != nil && part.InlineData.Data != "" {
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p.flushThinking()
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markdownImg := fmt.Sprintf("",
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part.InlineData.MimeType, part.InlineData.Data)
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p.textBuilder += markdownImg
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p.flushText()
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}
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}
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// flushText 刷新 text builder
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func (p *NonStreamingProcessor) flushText() {
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if p.textBuilder == "" {
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return
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}
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "text",
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Text: p.textBuilder,
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})
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p.textBuilder = ""
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}
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// flushThinking 刷新 thinking builder
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func (p *NonStreamingProcessor) flushThinking() {
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if p.thinkingBuilder == "" && p.thinkingSignature == "" {
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return
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}
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p.contentBlocks = append(p.contentBlocks, ClaudeContentItem{
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Type: "thinking",
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Thinking: p.thinkingBuilder,
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Signature: p.thinkingSignature,
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})
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p.thinkingBuilder = ""
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p.thinkingSignature = ""
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}
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// buildResponse 构建最终响应
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func (p *NonStreamingProcessor) buildResponse(geminiResp *GeminiResponse, responseID, originalModel string) *ClaudeResponse {
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var finishReason string
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if len(geminiResp.Candidates) > 0 {
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finishReason = geminiResp.Candidates[0].FinishReason
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}
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stopReason := "end_turn"
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if p.hasToolCall {
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stopReason = "tool_use"
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} else if finishReason == "MAX_TOKENS" {
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stopReason = "max_tokens"
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}
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usage := ClaudeUsage{}
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if geminiResp.UsageMetadata != nil {
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usage.InputTokens = geminiResp.UsageMetadata.PromptTokenCount
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usage.OutputTokens = geminiResp.UsageMetadata.CandidatesTokenCount
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}
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// 生成响应 ID
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respID := responseID
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if respID == "" {
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respID = geminiResp.ResponseID
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}
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if respID == "" {
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respID = "msg_" + generateRandomID()
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}
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return &ClaudeResponse{
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ID: respID,
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Type: "message",
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Role: "assistant",
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Model: originalModel,
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Content: p.contentBlocks,
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StopReason: stopReason,
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Usage: usage,
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}
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}
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// generateRandomID 生成随机 ID
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func generateRandomID() string {
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const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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result := make([]byte, 12)
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for i := range result {
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result[i] = chars[i%len(chars)]
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}
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return string(result)
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}
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