934 lines
27 KiB
Go
934 lines
27 KiB
Go
package service
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import (
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"bufio"
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"net/http"
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"strings"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/pkg/antigravity"
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"github.com/gin-gonic/gin"
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"github.com/google/uuid"
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)
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const (
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antigravityStickySessionTTL = time.Hour
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antigravityMaxRetries = 5
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antigravityRetryBaseDelay = 1 * time.Second
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antigravityRetryMaxDelay = 16 * time.Second
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)
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// Antigravity 直接支持的模型（精确匹配透传）
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var antigravitySupportedModels = map[string]bool{
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"claude-opus-4-5-thinking": true,
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"claude-sonnet-4-5": true,
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"claude-sonnet-4-5-thinking": true,
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"gemini-2.5-flash": true,
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"gemini-2.5-flash-lite": true,
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"gemini-2.5-flash-thinking": true,
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"gemini-3-flash": true,
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"gemini-3-pro-low": true,
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"gemini-3-pro-high": true,
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"gemini-3-pro-image": true,
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}
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// Antigravity 前缀映射表（按前缀长度降序排列，确保最长匹配优先）
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// 用于处理模型版本号变化（如 -20251111, -thinking, -preview 等后缀）
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var antigravityPrefixMapping = []struct {
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prefix string
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target string
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}{
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// 长前缀优先
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{"gemini-3-pro-image", "gemini-3-pro-image"}, // gemini-3-pro-image-preview 等
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{"claude-3-5-sonnet", "claude-sonnet-4-5"}, // 旧版 claude-3-5-sonnet-xxx
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{"claude-sonnet-4-5", "claude-sonnet-4-5"}, // claude-sonnet-4-5-xxx
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{"claude-haiku-4-5", "claude-sonnet-4-5"}, // claude-haiku-4-5-xxx → sonnet
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{"claude-opus-4-5", "claude-opus-4-5-thinking"},
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{"claude-3-haiku", "claude-sonnet-4-5"}, // 旧版 claude-3-haiku-xxx → sonnet
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{"claude-sonnet-4", "claude-sonnet-4-5"},
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{"claude-haiku-4", "claude-sonnet-4-5"}, // → sonnet
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{"claude-opus-4", "claude-opus-4-5-thinking"},
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{"gemini-3-pro", "gemini-3-pro-high"}, // gemini-3-pro, gemini-3-pro-preview 等
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}
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// AntigravityGatewayService 处理 Antigravity 平台的 API 转发
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type AntigravityGatewayService struct {
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accountRepo AccountRepository
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tokenProvider *AntigravityTokenProvider
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rateLimitService *RateLimitService
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httpUpstream HTTPUpstream
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}
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func NewAntigravityGatewayService(
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accountRepo AccountRepository,
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_ GatewayCache,
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tokenProvider *AntigravityTokenProvider,
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rateLimitService *RateLimitService,
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httpUpstream HTTPUpstream,
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) *AntigravityGatewayService {
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return &AntigravityGatewayService{
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accountRepo: accountRepo,
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tokenProvider: tokenProvider,
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rateLimitService: rateLimitService,
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httpUpstream: httpUpstream,
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}
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}
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// GetTokenProvider 返回 token provider
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func (s *AntigravityGatewayService) GetTokenProvider() *AntigravityTokenProvider {
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return s.tokenProvider
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}
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// getMappedModel 获取映射后的模型名
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// 逻辑：账户映射 → 直接支持透传 → 前缀映射 → gemini透传 → 默认值
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func (s *AntigravityGatewayService) getMappedModel(account *Account, requestedModel string) string {
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// 1. 账户级映射（用户自定义优先）
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if mapped := account.GetMappedModel(requestedModel); mapped != requestedModel {
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return mapped
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}
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// 2. 直接支持的模型透传
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if antigravitySupportedModels[requestedModel] {
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return requestedModel
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}
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// 3. 前缀映射（处理版本号变化，如 -20251111, -thinking, -preview）
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for _, pm := range antigravityPrefixMapping {
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if strings.HasPrefix(requestedModel, pm.prefix) {
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return pm.target
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}
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}
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// 4. Gemini 模型透传（未匹配到前缀的 gemini 模型）
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if strings.HasPrefix(requestedModel, "gemini-") {
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return requestedModel
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}
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// 5. 默认值
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return "claude-sonnet-4-5"
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}
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// IsModelSupported 检查模型是否被支持
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// 所有 claude- 和 gemini- 前缀的模型都能通过映射或透传支持
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func (s *AntigravityGatewayService) IsModelSupported(requestedModel string) bool {
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return strings.HasPrefix(requestedModel, "claude-") ||
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strings.HasPrefix(requestedModel, "gemini-")
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}
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// TestConnectionResult 测试连接结果
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type TestConnectionResult struct {
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Text string // 响应文本
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MappedModel string // 实际使用的模型
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}
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// TestConnection 测试 Antigravity 账号连接（非流式，无重试、无计费）
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// 支持 Claude 和 Gemini 两种协议，根据 modelID 前缀自动选择
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func (s *AntigravityGatewayService) TestConnection(ctx context.Context, account *Account, modelID string) (*TestConnectionResult, error) {
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// 获取 token
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if s.tokenProvider == nil {
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return nil, errors.New("antigravity token provider not configured")
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}
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accessToken, err := s.tokenProvider.GetAccessToken(ctx, account)
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if err != nil {
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return nil, fmt.Errorf("获取 access_token 失败: %w", err)
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}
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// 获取 project_id（部分账户类型可能没有）
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projectID := strings.TrimSpace(account.GetCredential("project_id"))
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// 模型映射
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mappedModel := s.getMappedModel(account, modelID)
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// 构建请求体
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var requestBody []byte
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if strings.HasPrefix(modelID, "gemini-") {
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// Gemini 模型：直接使用 Gemini 格式
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requestBody, err = s.buildGeminiTestRequest(projectID, mappedModel)
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} else {
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// Claude 模型：使用协议转换
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requestBody, err = s.buildClaudeTestRequest(projectID, mappedModel)
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}
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if err != nil {
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return nil, fmt.Errorf("构建请求失败: %w", err)
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}
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// 构建 HTTP 请求（非流式）
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req, err := antigravity.NewAPIRequest(ctx, "generateContent", accessToken, requestBody)
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if err != nil {
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return nil, err
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}
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// 代理 URL
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proxyURL := ""
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if account.ProxyID != nil && account.Proxy != nil {
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proxyURL = account.Proxy.URL()
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}
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// 发送请求
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resp, err := s.httpUpstream.Do(req, proxyURL, account.ID, account.Concurrency)
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if err != nil {
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return nil, fmt.Errorf("请求失败: %w", err)
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}
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defer func() { _ = resp.Body.Close() }()
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// 读取响应
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respBody, err := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
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if err != nil {
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return nil, fmt.Errorf("读取响应失败: %w", err)
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}
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if resp.StatusCode >= 400 {
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return nil, fmt.Errorf("API 返回 %d: %s", resp.StatusCode, string(respBody))
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}
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// 解包 v1internal 响应
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unwrapped, err := s.unwrapV1InternalResponse(respBody)
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if err != nil {
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return nil, fmt.Errorf("解包响应失败: %w", err)
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}
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// 提取响应文本
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text := extractGeminiResponseText(unwrapped)
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return &TestConnectionResult{
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Text: text,
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MappedModel: mappedModel,
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}, nil
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}
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// buildGeminiTestRequest 构建 Gemini 格式测试请求
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func (s *AntigravityGatewayService) buildGeminiTestRequest(projectID, model string) ([]byte, error) {
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payload := map[string]any{
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"contents": []map[string]any{
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{
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"role": "user",
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"parts": []map[string]any{
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{"text": "hi"},
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},
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},
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},
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}
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payloadBytes, _ := json.Marshal(payload)
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return s.wrapV1InternalRequest(projectID, model, payloadBytes)
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}
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// buildClaudeTestRequest 构建 Claude 格式测试请求并转换为 Gemini 格式
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func (s *AntigravityGatewayService) buildClaudeTestRequest(projectID, mappedModel string) ([]byte, error) {
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claudeReq := &antigravity.ClaudeRequest{
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Model: mappedModel,
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Messages: []antigravity.ClaudeMessage{
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{
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Role: "user",
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Content: json.RawMessage(`"hi"`),
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},
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},
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MaxTokens: 1024,
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Stream: false,
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}
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return antigravity.TransformClaudeToGemini(claudeReq, projectID, mappedModel)
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}
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// extractGeminiResponseText 从 Gemini 响应中提取文本
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func extractGeminiResponseText(respBody []byte) string {
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var resp map[string]any
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if err := json.Unmarshal(respBody, &resp); err != nil {
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return ""
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}
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candidates, ok := resp["candidates"].([]any)
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if !ok || len(candidates) == 0 {
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return ""
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}
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candidate, ok := candidates[0].(map[string]any)
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if !ok {
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return ""
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}
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content, ok := candidate["content"].(map[string]any)
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if !ok {
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return ""
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}
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parts, ok := content["parts"].([]any)
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if !ok {
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return ""
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}
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var texts []string
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for _, part := range parts {
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if partMap, ok := part.(map[string]any); ok {
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if text, ok := partMap["text"].(string); ok && text != "" {
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texts = append(texts, text)
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}
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}
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}
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return strings.Join(texts, "")
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}
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// wrapV1InternalRequest 包装请求为 v1internal 格式
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func (s *AntigravityGatewayService) wrapV1InternalRequest(projectID, model string, originalBody []byte) ([]byte, error) {
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var request any
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if err := json.Unmarshal(originalBody, &request); err != nil {
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||
return nil, fmt.Errorf("解析请求体失败: %w", err)
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}
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wrapped := map[string]any{
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"project": projectID,
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"requestId": "agent-" + uuid.New().String(),
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"userAgent": "sub2api",
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"requestType": "agent",
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"model": model,
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"request": request,
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}
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||
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||
return json.Marshal(wrapped)
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||
}
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||
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// unwrapV1InternalResponse 解包 v1internal 响应
|
||
func (s *AntigravityGatewayService) unwrapV1InternalResponse(body []byte) ([]byte, error) {
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var outer map[string]any
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||
if err := json.Unmarshal(body, &outer); err != nil {
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||
return nil, err
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||
}
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||
|
||
if resp, ok := outer["response"]; ok {
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||
return json.Marshal(resp)
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||
}
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||
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||
return body, nil
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||
}
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||
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||
// Forward 转发 Claude 协议请求（Claude → Gemini 转换）
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func (s *AntigravityGatewayService) Forward(ctx context.Context, c *gin.Context, account *Account, body []byte) (*ForwardResult, error) {
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||
startTime := time.Now()
|
||
|
||
// 解析 Claude 请求
|
||
var claudeReq antigravity.ClaudeRequest
|
||
if err := json.Unmarshal(body, &claudeReq); err != nil {
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||
return nil, fmt.Errorf("parse claude request: %w", err)
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||
}
|
||
if strings.TrimSpace(claudeReq.Model) == "" {
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return nil, fmt.Errorf("missing model")
|
||
}
|
||
|
||
originalModel := claudeReq.Model
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mappedModel := s.getMappedModel(account, claudeReq.Model)
|
||
if mappedModel != claudeReq.Model {
|
||
log.Printf("Antigravity model mapping: %s -> %s (account: %s)", claudeReq.Model, mappedModel, account.Name)
|
||
}
|
||
|
||
// 获取 access_token
|
||
if s.tokenProvider == nil {
|
||
return nil, errors.New("antigravity token provider not configured")
|
||
}
|
||
accessToken, err := s.tokenProvider.GetAccessToken(ctx, account)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("获取 access_token 失败: %w", err)
|
||
}
|
||
|
||
// 获取 project_id（部分账户类型可能没有）
|
||
projectID := strings.TrimSpace(account.GetCredential("project_id"))
|
||
|
||
// 代理 URL
|
||
proxyURL := ""
|
||
if account.ProxyID != nil && account.Proxy != nil {
|
||
proxyURL = account.Proxy.URL()
|
||
}
|
||
|
||
// 转换 Claude 请求为 Gemini 格式
|
||
geminiBody, err := antigravity.TransformClaudeToGemini(&claudeReq, projectID, mappedModel)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("transform request: %w", err)
|
||
}
|
||
|
||
// 调试：记录转换后的请求体（仅记录前 2000 字符）
|
||
if bodyJSON, err := json.Marshal(geminiBody); err == nil {
|
||
truncated := string(bodyJSON)
|
||
if len(truncated) > 2000 {
|
||
truncated = truncated[:2000] + "..."
|
||
}
|
||
log.Printf("[Debug] Transformed Gemini request: %s", truncated)
|
||
}
|
||
|
||
// 构建上游 action
|
||
action := "generateContent"
|
||
if claudeReq.Stream {
|
||
action = "streamGenerateContent?alt=sse"
|
||
}
|
||
|
||
// 重试循环
|
||
var resp *http.Response
|
||
for attempt := 1; attempt <= antigravityMaxRetries; attempt++ {
|
||
upstreamReq, err := antigravity.NewAPIRequest(ctx, action, accessToken, geminiBody)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
resp, err = s.httpUpstream.Do(upstreamReq, proxyURL, account.ID, account.Concurrency)
|
||
if err != nil {
|
||
if attempt < antigravityMaxRetries {
|
||
log.Printf("Antigravity account %d: upstream request failed, retry %d/%d: %v", account.ID, attempt, antigravityMaxRetries, err)
|
||
sleepAntigravityBackoff(attempt)
|
||
continue
|
||
}
|
||
return nil, s.writeClaudeError(c, http.StatusBadGateway, "upstream_error", "Upstream request failed after retries")
|
||
}
|
||
|
||
if resp.StatusCode >= 400 && s.shouldRetryUpstreamError(resp.StatusCode) {
|
||
respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
|
||
_ = resp.Body.Close()
|
||
|
||
if attempt < antigravityMaxRetries {
|
||
log.Printf("Antigravity account %d: upstream status %d, retry %d/%d", account.ID, resp.StatusCode, attempt, antigravityMaxRetries)
|
||
sleepAntigravityBackoff(attempt)
|
||
continue
|
||
}
|
||
// 所有重试都失败，标记限流状态
|
||
if resp.StatusCode == 429 {
|
||
s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
|
||
}
|
||
// 最后一次尝试也失败
|
||
resp = &http.Response{
|
||
StatusCode: resp.StatusCode,
|
||
Header: resp.Header.Clone(),
|
||
Body: io.NopCloser(bytes.NewReader(respBody)),
|
||
}
|
||
break
|
||
}
|
||
|
||
break
|
||
}
|
||
defer func() { _ = resp.Body.Close() }()
|
||
|
||
// 处理错误响应
|
||
if resp.StatusCode >= 400 {
|
||
respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
|
||
s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
|
||
|
||
if s.shouldFailoverUpstreamError(resp.StatusCode) {
|
||
return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
|
||
}
|
||
|
||
return nil, s.writeMappedClaudeError(c, resp.StatusCode, respBody)
|
||
}
|
||
|
||
requestID := resp.Header.Get("x-request-id")
|
||
if requestID != "" {
|
||
c.Header("x-request-id", requestID)
|
||
}
|
||
|
||
var usage *ClaudeUsage
|
||
var firstTokenMs *int
|
||
if claudeReq.Stream {
|
||
streamRes, err := s.handleClaudeStreamingResponse(c, resp, startTime, originalModel)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
usage = streamRes.usage
|
||
firstTokenMs = streamRes.firstTokenMs
|
||
} else {
|
||
usage, err = s.handleClaudeNonStreamingResponse(c, resp, originalModel)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
}
|
||
|
||
return &ForwardResult{
|
||
RequestID: requestID,
|
||
Usage: *usage,
|
||
Model: originalModel, // 使用原始模型用于计费和日志
|
||
Stream: claudeReq.Stream,
|
||
Duration: time.Since(startTime),
|
||
FirstTokenMs: firstTokenMs,
|
||
}, nil
|
||
}
|
||
|
||
// ForwardGemini 转发 Gemini 协议请求
|
||
func (s *AntigravityGatewayService) ForwardGemini(ctx context.Context, c *gin.Context, account *Account, originalModel string, action string, stream bool, body []byte) (*ForwardResult, error) {
|
||
startTime := time.Now()
|
||
|
||
if strings.TrimSpace(originalModel) == "" {
|
||
return nil, s.writeGoogleError(c, http.StatusBadRequest, "Missing model in URL")
|
||
}
|
||
if strings.TrimSpace(action) == "" {
|
||
return nil, s.writeGoogleError(c, http.StatusBadRequest, "Missing action in URL")
|
||
}
|
||
if len(body) == 0 {
|
||
return nil, s.writeGoogleError(c, http.StatusBadRequest, "Request body is empty")
|
||
}
|
||
|
||
switch action {
|
||
case "generateContent", "streamGenerateContent":
|
||
// ok
|
||
case "countTokens":
|
||
// 直接返回空值，不透传上游
|
||
c.JSON(http.StatusOK, map[string]any{"totalTokens": 0})
|
||
return &ForwardResult{
|
||
RequestID: "",
|
||
Usage: ClaudeUsage{},
|
||
Model: originalModel,
|
||
Stream: false,
|
||
Duration: time.Since(time.Now()),
|
||
FirstTokenMs: nil,
|
||
}, nil
|
||
default:
|
||
return nil, s.writeGoogleError(c, http.StatusNotFound, "Unsupported action: "+action)
|
||
}
|
||
|
||
mappedModel := s.getMappedModel(account, originalModel)
|
||
|
||
// 获取 access_token
|
||
if s.tokenProvider == nil {
|
||
return nil, errors.New("antigravity token provider not configured")
|
||
}
|
||
accessToken, err := s.tokenProvider.GetAccessToken(ctx, account)
|
||
if err != nil {
|
||
return nil, fmt.Errorf("获取 access_token 失败: %w", err)
|
||
}
|
||
|
||
// 获取 project_id（部分账户类型可能没有）
|
||
projectID := strings.TrimSpace(account.GetCredential("project_id"))
|
||
|
||
// 代理 URL
|
||
proxyURL := ""
|
||
if account.ProxyID != nil && account.Proxy != nil {
|
||
proxyURL = account.Proxy.URL()
|
||
}
|
||
|
||
// 包装请求
|
||
wrappedBody, err := s.wrapV1InternalRequest(projectID, mappedModel, body)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
// 构建上游 action
|
||
upstreamAction := action
|
||
if action == "generateContent" && stream {
|
||
upstreamAction = "streamGenerateContent"
|
||
}
|
||
if stream || upstreamAction == "streamGenerateContent" {
|
||
upstreamAction += "?alt=sse"
|
||
}
|
||
|
||
// 重试循环
|
||
var resp *http.Response
|
||
for attempt := 1; attempt <= antigravityMaxRetries; attempt++ {
|
||
upstreamReq, err := antigravity.NewAPIRequest(ctx, upstreamAction, accessToken, wrappedBody)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
resp, err = s.httpUpstream.Do(upstreamReq, proxyURL, account.ID, account.Concurrency)
|
||
if err != nil {
|
||
if attempt < antigravityMaxRetries {
|
||
log.Printf("Antigravity account %d: upstream request failed, retry %d/%d: %v", account.ID, attempt, antigravityMaxRetries, err)
|
||
sleepAntigravityBackoff(attempt)
|
||
continue
|
||
}
|
||
return nil, s.writeGoogleError(c, http.StatusBadGateway, "Upstream request failed after retries")
|
||
}
|
||
|
||
if resp.StatusCode >= 400 && s.shouldRetryUpstreamError(resp.StatusCode) {
|
||
respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
|
||
_ = resp.Body.Close()
|
||
|
||
if attempt < antigravityMaxRetries {
|
||
log.Printf("Antigravity account %d: upstream status %d, retry %d/%d", account.ID, resp.StatusCode, attempt, antigravityMaxRetries)
|
||
sleepAntigravityBackoff(attempt)
|
||
continue
|
||
}
|
||
// 所有重试都失败，标记限流状态
|
||
if resp.StatusCode == 429 {
|
||
s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
|
||
}
|
||
resp = &http.Response{
|
||
StatusCode: resp.StatusCode,
|
||
Header: resp.Header.Clone(),
|
||
Body: io.NopCloser(bytes.NewReader(respBody)),
|
||
}
|
||
break
|
||
}
|
||
|
||
break
|
||
}
|
||
defer func() { _ = resp.Body.Close() }()
|
||
|
||
requestID := resp.Header.Get("x-request-id")
|
||
if requestID != "" {
|
||
c.Header("x-request-id", requestID)
|
||
}
|
||
|
||
// 处理错误响应
|
||
if resp.StatusCode >= 400 {
|
||
respBody, _ := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
|
||
s.handleUpstreamError(ctx, account, resp.StatusCode, resp.Header, respBody)
|
||
|
||
if s.shouldFailoverUpstreamError(resp.StatusCode) {
|
||
return nil, &UpstreamFailoverError{StatusCode: resp.StatusCode}
|
||
}
|
||
|
||
// 解包并返回错误
|
||
unwrapped, _ := s.unwrapV1InternalResponse(respBody)
|
||
contentType := resp.Header.Get("Content-Type")
|
||
if contentType == "" {
|
||
contentType = "application/json"
|
||
}
|
||
c.Data(resp.StatusCode, contentType, unwrapped)
|
||
return nil, fmt.Errorf("antigravity upstream error: %d", resp.StatusCode)
|
||
}
|
||
|
||
var usage *ClaudeUsage
|
||
var firstTokenMs *int
|
||
|
||
if stream || upstreamAction == "streamGenerateContent" {
|
||
streamRes, err := s.handleGeminiStreamingResponse(c, resp, startTime)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
usage = streamRes.usage
|
||
firstTokenMs = streamRes.firstTokenMs
|
||
} else {
|
||
usageResp, err := s.handleGeminiNonStreamingResponse(c, resp)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
usage = usageResp
|
||
}
|
||
|
||
if usage == nil {
|
||
usage = &ClaudeUsage{}
|
||
}
|
||
|
||
return &ForwardResult{
|
||
RequestID: requestID,
|
||
Usage: *usage,
|
||
Model: originalModel,
|
||
Stream: stream,
|
||
Duration: time.Since(startTime),
|
||
FirstTokenMs: firstTokenMs,
|
||
}, nil
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) shouldRetryUpstreamError(statusCode int) bool {
|
||
switch statusCode {
|
||
case 429, 500, 502, 503, 504, 529:
|
||
return true
|
||
default:
|
||
return false
|
||
}
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) shouldFailoverUpstreamError(statusCode int) bool {
|
||
switch statusCode {
|
||
case 401, 403, 429, 529:
|
||
return true
|
||
default:
|
||
return statusCode >= 500
|
||
}
|
||
}
|
||
|
||
func sleepAntigravityBackoff(attempt int) {
|
||
sleepGeminiBackoff(attempt) // 复用 Gemini 的退避逻辑
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) handleUpstreamError(ctx context.Context, account *Account, statusCode int, headers http.Header, body []byte) {
|
||
// 429 使用 Gemini 格式解析（从 body 解析重置时间）
|
||
if statusCode == 429 {
|
||
resetAt := ParseGeminiRateLimitResetTime(body)
|
||
if resetAt == nil {
|
||
// 解析失败：Gemini 有重试时间用 5 分钟，Claude 没有用 1 分钟
|
||
defaultDur := 1 * time.Minute
|
||
if bytes.Contains(body, []byte("Please retry in")) || bytes.Contains(body, []byte("retryDelay")) {
|
||
defaultDur = 5 * time.Minute
|
||
}
|
||
ra := time.Now().Add(defaultDur)
|
||
_ = s.accountRepo.SetRateLimited(ctx, account.ID, ra)
|
||
return
|
||
}
|
||
_ = s.accountRepo.SetRateLimited(ctx, account.ID, time.Unix(*resetAt, 0))
|
||
return
|
||
}
|
||
// 其他错误码继续使用 rateLimitService
|
||
if s.rateLimitService == nil {
|
||
return
|
||
}
|
||
s.rateLimitService.HandleUpstreamError(ctx, account, statusCode, headers, body)
|
||
}
|
||
|
||
type antigravityStreamResult struct {
|
||
usage *ClaudeUsage
|
||
firstTokenMs *int
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) handleGeminiStreamingResponse(c *gin.Context, resp *http.Response, startTime time.Time) (*antigravityStreamResult, error) {
|
||
c.Status(resp.StatusCode)
|
||
c.Header("Cache-Control", "no-cache")
|
||
c.Header("Connection", "keep-alive")
|
||
c.Header("X-Accel-Buffering", "no")
|
||
|
||
contentType := resp.Header.Get("Content-Type")
|
||
if contentType == "" {
|
||
contentType = "text/event-stream; charset=utf-8"
|
||
}
|
||
c.Header("Content-Type", contentType)
|
||
|
||
flusher, ok := c.Writer.(http.Flusher)
|
||
if !ok {
|
||
return nil, errors.New("streaming not supported")
|
||
}
|
||
|
||
reader := bufio.NewReader(resp.Body)
|
||
usage := &ClaudeUsage{}
|
||
var firstTokenMs *int
|
||
|
||
for {
|
||
line, err := reader.ReadString('\n')
|
||
if len(line) > 0 {
|
||
trimmed := strings.TrimRight(line, "\r\n")
|
||
if strings.HasPrefix(trimmed, "data:") {
|
||
payload := strings.TrimSpace(strings.TrimPrefix(trimmed, "data:"))
|
||
if payload == "" || payload == "[DONE]" {
|
||
_, _ = io.WriteString(c.Writer, line)
|
||
flusher.Flush()
|
||
} else {
|
||
// 解包 v1internal 响应
|
||
inner, parseErr := s.unwrapV1InternalResponse([]byte(payload))
|
||
if parseErr == nil && inner != nil {
|
||
payload = string(inner)
|
||
}
|
||
|
||
// 解析 usage
|
||
var parsed map[string]any
|
||
if json.Unmarshal(inner, &parsed) == nil {
|
||
if u := extractGeminiUsage(parsed); u != nil {
|
||
usage = u
|
||
}
|
||
}
|
||
|
||
if firstTokenMs == nil {
|
||
ms := int(time.Since(startTime).Milliseconds())
|
||
firstTokenMs = &ms
|
||
}
|
||
|
||
_, _ = fmt.Fprintf(c.Writer, "data: %s\n\n", payload)
|
||
flusher.Flush()
|
||
}
|
||
} else {
|
||
_, _ = io.WriteString(c.Writer, line)
|
||
flusher.Flush()
|
||
}
|
||
}
|
||
|
||
if errors.Is(err, io.EOF) {
|
||
break
|
||
}
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
}
|
||
|
||
return &antigravityStreamResult{usage: usage, firstTokenMs: firstTokenMs}, nil
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) handleGeminiNonStreamingResponse(c *gin.Context, resp *http.Response) (*ClaudeUsage, error) {
|
||
respBody, err := io.ReadAll(resp.Body)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
// 解包 v1internal 响应
|
||
unwrapped, _ := s.unwrapV1InternalResponse(respBody)
|
||
|
||
var parsed map[string]any
|
||
if json.Unmarshal(unwrapped, &parsed) == nil {
|
||
if u := extractGeminiUsage(parsed); u != nil {
|
||
c.Data(resp.StatusCode, "application/json", unwrapped)
|
||
return u, nil
|
||
}
|
||
}
|
||
|
||
c.Data(resp.StatusCode, "application/json", unwrapped)
|
||
return &ClaudeUsage{}, nil
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) writeClaudeError(c *gin.Context, status int, errType, message string) error {
|
||
c.JSON(status, gin.H{
|
||
"type": "error",
|
||
"error": gin.H{"type": errType, "message": message},
|
||
})
|
||
return fmt.Errorf("%s", message)
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) writeMappedClaudeError(c *gin.Context, upstreamStatus int, body []byte) error {
|
||
// 记录上游错误详情便于调试
|
||
log.Printf("Antigravity upstream error %d: %s", upstreamStatus, string(body))
|
||
|
||
var statusCode int
|
||
var errType, errMsg string
|
||
|
||
switch upstreamStatus {
|
||
case 400:
|
||
statusCode = http.StatusBadRequest
|
||
errType = "invalid_request_error"
|
||
errMsg = "Invalid request"
|
||
case 401:
|
||
statusCode = http.StatusBadGateway
|
||
errType = "authentication_error"
|
||
errMsg = "Upstream authentication failed"
|
||
case 403:
|
||
statusCode = http.StatusBadGateway
|
||
errType = "permission_error"
|
||
errMsg = "Upstream access forbidden"
|
||
case 429:
|
||
statusCode = http.StatusTooManyRequests
|
||
errType = "rate_limit_error"
|
||
errMsg = "Upstream rate limit exceeded"
|
||
case 529:
|
||
statusCode = http.StatusServiceUnavailable
|
||
errType = "overloaded_error"
|
||
errMsg = "Upstream service overloaded"
|
||
default:
|
||
statusCode = http.StatusBadGateway
|
||
errType = "upstream_error"
|
||
errMsg = "Upstream request failed"
|
||
}
|
||
|
||
c.JSON(statusCode, gin.H{
|
||
"type": "error",
|
||
"error": gin.H{"type": errType, "message": errMsg},
|
||
})
|
||
return fmt.Errorf("upstream error: %d", upstreamStatus)
|
||
}
|
||
|
||
func (s *AntigravityGatewayService) writeGoogleError(c *gin.Context, status int, message string) error {
|
||
statusStr := "UNKNOWN"
|
||
switch status {
|
||
case 400:
|
||
statusStr = "INVALID_ARGUMENT"
|
||
case 404:
|
||
statusStr = "NOT_FOUND"
|
||
case 429:
|
||
statusStr = "RESOURCE_EXHAUSTED"
|
||
case 500:
|
||
statusStr = "INTERNAL"
|
||
case 502, 503:
|
||
statusStr = "UNAVAILABLE"
|
||
}
|
||
|
||
c.JSON(status, gin.H{
|
||
"error": gin.H{
|
||
"code": status,
|
||
"message": message,
|
||
"status": statusStr,
|
||
},
|
||
})
|
||
return fmt.Errorf("%s", message)
|
||
}
|
||
|
||
// handleClaudeNonStreamingResponse 处理 Claude 非流式响应（Gemini → Claude 转换）
|
||
func (s *AntigravityGatewayService) handleClaudeNonStreamingResponse(c *gin.Context, resp *http.Response, originalModel string) (*ClaudeUsage, error) {
|
||
body, err := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
|
||
if err != nil {
|
||
return nil, s.writeClaudeError(c, http.StatusBadGateway, "upstream_error", "Failed to read upstream response")
|
||
}
|
||
|
||
// 转换 Gemini 响应为 Claude 格式
|
||
claudeResp, agUsage, err := antigravity.TransformGeminiToClaude(body, originalModel)
|
||
if err != nil {
|
||
log.Printf("Transform Gemini to Claude failed: %v, body: %s", err, string(body))
|
||
return nil, s.writeClaudeError(c, http.StatusBadGateway, "upstream_error", "Failed to parse upstream response")
|
||
}
|
||
|
||
c.Data(http.StatusOK, "application/json", claudeResp)
|
||
|
||
// 转换为 service.ClaudeUsage
|
||
usage := &ClaudeUsage{
|
||
InputTokens: agUsage.InputTokens,
|
||
OutputTokens: agUsage.OutputTokens,
|
||
CacheCreationInputTokens: agUsage.CacheCreationInputTokens,
|
||
CacheReadInputTokens: agUsage.CacheReadInputTokens,
|
||
}
|
||
return usage, nil
|
||
}
|
||
|
||
// handleClaudeStreamingResponse 处理 Claude 流式响应（Gemini SSE → Claude SSE 转换）
|
||
func (s *AntigravityGatewayService) handleClaudeStreamingResponse(c *gin.Context, resp *http.Response, startTime time.Time, originalModel string) (*antigravityStreamResult, error) {
|
||
c.Header("Content-Type", "text/event-stream")
|
||
c.Header("Cache-Control", "no-cache")
|
||
c.Header("Connection", "keep-alive")
|
||
c.Header("X-Accel-Buffering", "no")
|
||
c.Status(http.StatusOK)
|
||
|
||
flusher, ok := c.Writer.(http.Flusher)
|
||
if !ok {
|
||
return nil, errors.New("streaming not supported")
|
||
}
|
||
|
||
processor := antigravity.NewStreamingProcessor(originalModel)
|
||
var firstTokenMs *int
|
||
reader := bufio.NewReader(resp.Body)
|
||
|
||
// 辅助函数：转换 antigravity.ClaudeUsage 到 service.ClaudeUsage
|
||
convertUsage := func(agUsage *antigravity.ClaudeUsage) *ClaudeUsage {
|
||
if agUsage == nil {
|
||
return &ClaudeUsage{}
|
||
}
|
||
return &ClaudeUsage{
|
||
InputTokens: agUsage.InputTokens,
|
||
OutputTokens: agUsage.OutputTokens,
|
||
CacheCreationInputTokens: agUsage.CacheCreationInputTokens,
|
||
CacheReadInputTokens: agUsage.CacheReadInputTokens,
|
||
}
|
||
}
|
||
|
||
for {
|
||
line, err := reader.ReadString('\n')
|
||
if err != nil && !errors.Is(err, io.EOF) {
|
||
return nil, fmt.Errorf("stream read error: %w", err)
|
||
}
|
||
|
||
if len(line) > 0 {
|
||
// 处理 SSE 行，转换为 Claude 格式
|
||
claudeEvents := processor.ProcessLine(strings.TrimRight(line, "\r\n"))
|
||
|
||
if len(claudeEvents) > 0 {
|
||
if firstTokenMs == nil {
|
||
ms := int(time.Since(startTime).Milliseconds())
|
||
firstTokenMs = &ms
|
||
}
|
||
|
||
if _, writeErr := c.Writer.Write(claudeEvents); writeErr != nil {
|
||
finalEvents, agUsage := processor.Finish()
|
||
if len(finalEvents) > 0 {
|
||
_, _ = c.Writer.Write(finalEvents)
|
||
}
|
||
return &antigravityStreamResult{usage: convertUsage(agUsage), firstTokenMs: firstTokenMs}, writeErr
|
||
}
|
||
flusher.Flush()
|
||
}
|
||
}
|
||
|
||
if errors.Is(err, io.EOF) {
|
||
break
|
||
}
|
||
}
|
||
|
||
// 发送结束事件
|
||
finalEvents, agUsage := processor.Finish()
|
||
if len(finalEvents) > 0 {
|
||
_, _ = c.Writer.Write(finalEvents)
|
||
flusher.Flush()
|
||
}
|
||
|
||
return &antigravityStreamResult{usage: convertUsage(agUsage), firstTokenMs: firstTokenMs}, nil
|
||
}
|