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feat: add antigravity web search support

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This commit is contained in:
song
2026-01-18 01:09:40 +08:00
parent 8b071cc665
commit 6941315432
4 changed files with 178 additions and 28 deletions
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24
backend/internal/pkg/antigravity/gemini_types.go
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@@ -143,9 +143,10 @@ type GeminiResponse struct {
// GeminiCandidate Gemini 候选响应
type GeminiCandidate struct {
Content *GeminiContent `json:"content,omitempty"`
FinishReason string `json:"finishReason,omitempty"`
Index int `json:"index,omitempty"`
Content *GeminiContent `json:"content,omitempty"`
FinishReason string `json:"finishReason,omitempty"`
Index int `json:"index,omitempty"`
GroundingMetadata *GeminiGroundingMetadata `json:"groundingMetadata,omitempty"`
}
// GeminiUsageMetadata Gemini 用量元数据
@@ -156,6 +157,23 @@ type GeminiUsageMetadata struct {
TotalTokenCount int `json:"totalTokenCount,omitempty"`
}
// GeminiGroundingMetadata Gemini grounding 元数据（Web Search）
type GeminiGroundingMetadata struct {
WebSearchQueries []string `json:"webSearchQueries,omitempty"`
GroundingChunks []GeminiGroundingChunk `json:"groundingChunks,omitempty"`
}
// GeminiGroundingChunk Gemini grounding chunk
type GeminiGroundingChunk struct {
Web *GeminiGroundingWeb `json:"web,omitempty"`
}
// GeminiGroundingWeb Gemini grounding web 信息
type GeminiGroundingWeb struct {
Title string `json:"title,omitempty"`
URI string `json:"uri,omitempty"`
}
// DefaultSafetySettings 默认安全设置（关闭所有过滤）
var DefaultSafetySettings = []GeminiSafetySetting{
{Category: "HARM_CATEGORY_HARASSMENT", Threshold: "OFF"},

88
backend/internal/pkg/antigravity/request_transformer.go
View File

@@ -54,6 +54,9 @@ func DefaultTransformOptions() TransformOptions {
}
}
// webSearchFallbackModel web_search 请求使用的降级模型
const webSearchFallbackModel = "gemini-2.5-flash"
// TransformClaudeToGemini 将 Claude 请求转换为 v1internal Gemini 格式
func TransformClaudeToGemini(claudeReq *ClaudeRequest, projectID, mappedModel string) ([]byte, error) {
return TransformClaudeToGeminiWithOptions(claudeReq, projectID, mappedModel, DefaultTransformOptions())
@@ -64,12 +67,23 @@ func TransformClaudeToGeminiWithOptions(claudeReq *ClaudeRequest, projectID, map
// 用于存储 tool_use id -> name 映射
toolIDToName := make(map[string]string)
// 检测是否有 web_search 工具
hasWebSearchTool := hasWebSearchTool(claudeReq.Tools)
requestType := "agent"
targetModel := mappedModel
if hasWebSearchTool {
requestType = "web_search"
if targetModel != webSearchFallbackModel {
targetModel = webSearchFallbackModel
}
}
// 检测是否启用 thinking
isThinkingEnabled := claudeReq.Thinking != nil && claudeReq.Thinking.Type == "enabled"
// 只有 Gemini 模型支持 dummy thought workaround
// Claude 模型通过 Vertex/Google API 需要有效的 thought signatures
allowDummyThought := strings.HasPrefix(mappedModel, "gemini-")
allowDummyThought := strings.HasPrefix(targetModel, "gemini-")
// 1. 构建 contents
contents, strippedThinking, err := buildContents(claudeReq.Messages, toolIDToName, isThinkingEnabled, allowDummyThought)
@@ -89,6 +103,11 @@ func TransformClaudeToGeminiWithOptions(claudeReq *ClaudeRequest, projectID, map
reqCopy.Thinking = nil
reqForConfig = &reqCopy
}
if targetModel != "" && targetModel != reqForConfig.Model {
reqCopy := *reqForConfig
reqCopy.Model = targetModel
reqForConfig = &reqCopy
}
generationConfig := buildGenerationConfig(reqForConfig)
// 4. 构建 tools
@@ -127,8 +146,8 @@ func TransformClaudeToGeminiWithOptions(claudeReq *ClaudeRequest, projectID, map
Project: projectID,
RequestID: "agent-" + uuid.New().String(),
UserAgent: "antigravity", // 固定值，与官方客户端一致
RequestType: "agent",
Model: mappedModel,
RequestType: requestType,
Model: targetModel,
Request: innerRequest,
}
@@ -513,37 +532,43 @@ func buildGenerationConfig(req *ClaudeRequest) *GeminiGenerationConfig {
return config
}
func hasWebSearchTool(tools []ClaudeTool) bool {
for _, tool := range tools {
if isWebSearchTool(tool) {
return true
}
}
return false
}
func isWebSearchTool(tool ClaudeTool) bool {
if strings.HasPrefix(tool.Type, "web_search") || tool.Type == "google_search" {
return true
}
name := strings.TrimSpace(tool.Name)
switch name {
case "web_search", "google_search", "web_search_20250305":
return true
default:
return false
}
}
// buildTools 构建 tools
func buildTools(tools []ClaudeTool) []GeminiToolDeclaration {
if len(tools) == 0 {
return nil
}
// 检查是否有 web_search 工具
hasWebSearch := false
for _, tool := range tools {
if tool.Name == "web_search" {
hasWebSearch = true
break
}
}
if hasWebSearch {
// Web Search 工具映射
return []GeminiToolDeclaration{{
GoogleSearch: &GeminiGoogleSearch{
EnhancedContent: &GeminiEnhancedContent{
ImageSearch: &GeminiImageSearch{
MaxResultCount: 5,
},
},
},
}}
}
hasWebSearch := hasWebSearchTool(tools)
// 普通工具
var funcDecls []GeminiFunctionDecl
for _, tool := range tools {
if isWebSearchTool(tool) {
continue
}
// 跳过无效工具名称
if strings.TrimSpace(tool.Name) == "" {
log.Printf("Warning: skipping tool with empty name")
@@ -586,7 +611,20 @@ func buildTools(tools []ClaudeTool) []GeminiToolDeclaration {
}
if len(funcDecls) == 0 {
return nil
if !hasWebSearch {
return nil
}
// Web Search 工具映射
return []GeminiToolDeclaration{{
GoogleSearch: &GeminiGoogleSearch{
EnhancedContent: &GeminiEnhancedContent{
ImageSearch: &GeminiImageSearch{
MaxResultCount: 5,
},
},
},
}}
}
return []GeminiToolDeclaration{{

57
backend/internal/pkg/antigravity/response_transformer.go
View File

@@ -3,6 +3,7 @@ package antigravity
import (
"encoding/json"
"fmt"
"strings"
)
// TransformGeminiToClaude 将 Gemini 响应转换为 Claude 格式（非流式）
@@ -63,6 +64,12 @@ func (p *NonStreamingProcessor) Process(geminiResp *GeminiResponse, responseID,
p.processPart(&part)
}
if len(geminiResp.Candidates) > 0 {
if grounding := geminiResp.Candidates[0].GroundingMetadata; grounding != nil {
p.processGrounding(grounding)
}
}
// 刷新剩余内容
p.flushThinking()
p.flushText()
@@ -190,6 +197,18 @@ func (p *NonStreamingProcessor) processPart(part *GeminiPart) {
}
}
func (p *NonStreamingProcessor) processGrounding(grounding *GeminiGroundingMetadata) {
groundingText := buildGroundingText(grounding)
if groundingText == "" {
return
}
p.flushThinking()
p.flushText()
p.textBuilder += groundingText
p.flushText()
}
// flushText 刷新 text builder
func (p *NonStreamingProcessor) flushText() {
if p.textBuilder == "" {
@@ -262,6 +281,44 @@ func (p *NonStreamingProcessor) buildResponse(geminiResp *GeminiResponse, respon
}
}
func buildGroundingText(grounding *GeminiGroundingMetadata) string {
if grounding == nil {
return ""
}
var builder strings.Builder
if len(grounding.WebSearchQueries) > 0 {
builder.WriteString("\n\n---\nWeb search queries: ")
builder.WriteString(strings.Join(grounding.WebSearchQueries, ", "))
}
if len(grounding.GroundingChunks) > 0 {
var links []string
for i, chunk := range grounding.GroundingChunks {
if chunk.Web == nil {
continue
}
title := strings.TrimSpace(chunk.Web.Title)
if title == "" {
title = "Source"
}
uri := strings.TrimSpace(chunk.Web.URI)
if uri == "" {
uri = "#"
}
links = append(links, fmt.Sprintf("[%d] [%s](%s)", i+1, title, uri))
}
if len(links) > 0 {
builder.WriteString("\n\nSources:\n")
builder.WriteString(strings.Join(links, "\n"))
}
}
return builder.String()
}
// generateRandomID 生成随机 ID
func generateRandomID() string {
const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

37
backend/internal/pkg/antigravity/stream_transformer.go
View File

@@ -27,6 +27,8 @@ type StreamingProcessor struct {
pendingSignature string
trailingSignature string
originalModel string
webSearchQueries []string
groundingChunks []GeminiGroundingChunk
// 累计 usage
inputTokens int
@@ -93,6 +95,10 @@ func (p *StreamingProcessor) ProcessLine(line string) []byte {
}
}
if len(geminiResp.Candidates) > 0 {
p.captureGrounding(geminiResp.Candidates[0].GroundingMetadata)
}
// 检查是否结束
if len(geminiResp.Candidates) > 0 {
finishReason := geminiResp.Candidates[0].FinishReason
@@ -200,6 +206,20 @@ func (p *StreamingProcessor) processPart(part *GeminiPart) []byte {
return result.Bytes()
}
func (p *StreamingProcessor) captureGrounding(grounding *GeminiGroundingMetadata) {
if grounding == nil {
return
}
if len(grounding.WebSearchQueries) > 0 && len(p.webSearchQueries) == 0 {
p.webSearchQueries = append([]string(nil), grounding.WebSearchQueries...)
}
if len(grounding.GroundingChunks) > 0 && len(p.groundingChunks) == 0 {
p.groundingChunks = append([]GeminiGroundingChunk(nil), grounding.GroundingChunks...)
}
}
// processThinking 处理 thinking
func (p *StreamingProcessor) processThinking(text, signature string) []byte {
var result bytes.Buffer
@@ -417,6 +437,23 @@ func (p *StreamingProcessor) emitFinish(finishReason string) []byte {
p.trailingSignature = ""
}
if len(p.webSearchQueries) > 0 || len(p.groundingChunks) > 0 {
groundingText := buildGroundingText(&GeminiGroundingMetadata{
WebSearchQueries: p.webSearchQueries,
GroundingChunks: p.groundingChunks,
})
if groundingText != "" {
_, _ = result.Write(p.startBlock(BlockTypeText, map[string]any{
"type": "text",
"text": "",
}))
_, _ = result.Write(p.emitDelta("text_delta", map[string]any{
"text": groundingText,
}))
_, _ = result.Write(p.endBlock())
}
}
// 确定 stop_reason
stopReason := "end_turn"
if p.usedTool {