mirror of
https://github.com/CJackHwang/ds2api.git
synced 2026-05-23 10:57:44 +08:00
refactor backend API structure
This commit is contained in:
CJACK
283
internal/httpapi/gemini/handler_generate.go
Normal file
283
internal/httpapi/gemini/handler_generate.go
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@@ -0,0 +1,283 @@
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package gemini
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import (
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"bytes"
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"ds2api/internal/toolcall"
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"encoding/json"
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"io"
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"net/http"
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"net/http/httptest"
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"strings"
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"github.com/go-chi/chi/v5"
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"ds2api/internal/sse"
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"ds2api/internal/translatorcliproxy"
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"ds2api/internal/util"
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sdktranslator "github.com/router-for-me/CLIProxyAPI/v6/sdk/translator"
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)
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func (h *Handler) handleGenerateContent(w http.ResponseWriter, r *http.Request, stream bool) {
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if h.OpenAI == nil {
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writeGeminiError(w, http.StatusInternalServerError, "OpenAI proxy backend unavailable.")
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return
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}
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if h.proxyViaOpenAI(w, r, stream) {
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return
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}
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writeGeminiError(w, http.StatusBadGateway, "Failed to proxy Gemini request.")
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}
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func (h *Handler) proxyViaOpenAI(w http.ResponseWriter, r *http.Request, stream bool) bool {
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raw, err := io.ReadAll(r.Body)
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if err != nil {
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writeGeminiError(w, http.StatusBadRequest, "invalid body")
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return true
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}
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routeModel := strings.TrimSpace(chi.URLParam(r, "model"))
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var req map[string]any
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if err := json.Unmarshal(raw, &req); err != nil {
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writeGeminiError(w, http.StatusBadRequest, "invalid json")
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return true
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}
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translatedReq := translatorcliproxy.ToOpenAI(sdktranslator.FormatGemini, routeModel, raw, stream)
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if !strings.Contains(string(translatedReq), `"stream"`) {
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var reqMap map[string]any
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if json.Unmarshal(translatedReq, &reqMap) == nil {
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reqMap["stream"] = stream
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if b, e := json.Marshal(reqMap); e == nil {
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translatedReq = b
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}
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}
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}
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translatedReq = applyGeminiThinkingPolicyToOpenAIRequest(translatedReq, req)
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isVercelPrepare := strings.TrimSpace(r.URL.Query().Get("__stream_prepare")) == "1"
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isVercelRelease := strings.TrimSpace(r.URL.Query().Get("__stream_release")) == "1"
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if isVercelRelease {
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proxyReq := r.Clone(r.Context())
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proxyReq.URL.Path = "/v1/chat/completions"
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proxyReq.Body = io.NopCloser(bytes.NewReader(raw))
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proxyReq.ContentLength = int64(len(raw))
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rec := httptest.NewRecorder()
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h.OpenAI.ChatCompletions(rec, proxyReq)
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res := rec.Result()
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defer func() { _ = res.Body.Close() }()
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body, _ := io.ReadAll(res.Body)
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for k, vv := range res.Header {
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for _, v := range vv {
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w.Header().Add(k, v)
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}
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}
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w.WriteHeader(res.StatusCode)
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_, _ = w.Write(body)
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return true
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}
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proxyReq := r.Clone(r.Context())
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proxyReq.URL.Path = "/v1/chat/completions"
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proxyReq.Body = io.NopCloser(bytes.NewReader(translatedReq))
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proxyReq.ContentLength = int64(len(translatedReq))
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if stream && !isVercelPrepare {
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache, no-transform")
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w.Header().Set("Connection", "keep-alive")
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w.Header().Set("X-Accel-Buffering", "no")
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streamWriter := translatorcliproxy.NewOpenAIStreamTranslatorWriter(w, sdktranslator.FormatGemini, routeModel, raw, translatedReq)
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h.OpenAI.ChatCompletions(streamWriter, proxyReq)
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return true
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}
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rec := httptest.NewRecorder()
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h.OpenAI.ChatCompletions(rec, proxyReq)
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res := rec.Result()
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defer func() { _ = res.Body.Close() }()
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body, _ := io.ReadAll(res.Body)
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if res.StatusCode < 200 || res.StatusCode >= 300 {
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for k, vv := range res.Header {
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for _, v := range vv {
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w.Header().Add(k, v)
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}
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}
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writeGeminiErrorFromOpenAI(w, res.StatusCode, body)
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return true
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}
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if isVercelPrepare {
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for k, vv := range res.Header {
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for _, v := range vv {
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w.Header().Add(k, v)
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}
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}
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w.WriteHeader(res.StatusCode)
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_, _ = w.Write(body)
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return true
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}
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converted := translatorcliproxy.FromOpenAINonStream(sdktranslator.FormatGemini, routeModel, raw, translatedReq, body)
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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_, _ = w.Write(converted)
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return true
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}
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func applyGeminiThinkingPolicyToOpenAIRequest(translated []byte, original map[string]any) []byte {
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req := map[string]any{}
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if err := json.Unmarshal(translated, &req); err != nil {
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return translated
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}
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enabled, ok := resolveGeminiThinkingOverride(original)
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if !ok {
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return translated
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}
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typ := "disabled"
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if enabled {
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typ = "enabled"
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}
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req["thinking"] = map[string]any{"type": typ}
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out, err := json.Marshal(req)
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if err != nil {
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return translated
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}
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return out
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}
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func resolveGeminiThinkingOverride(req map[string]any) (bool, bool) {
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generationConfig, ok := req["generationConfig"].(map[string]any)
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if !ok {
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generationConfig, ok = req["generation_config"].(map[string]any)
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}
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if !ok {
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return false, false
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}
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thinkingConfig, ok := generationConfig["thinkingConfig"].(map[string]any)
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if !ok {
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thinkingConfig, ok = generationConfig["thinking_config"].(map[string]any)
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}
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if !ok {
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return false, false
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}
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budget, ok := numericAny(thinkingConfig["thinkingBudget"])
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if !ok {
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budget, ok = numericAny(thinkingConfig["thinking_budget"])
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}
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if !ok {
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return false, false
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}
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return budget > 0, true
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}
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func numericAny(raw any) (float64, bool) {
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switch v := raw.(type) {
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case float64:
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return v, true
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case float32:
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return float64(v), true
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case int:
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return float64(v), true
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case int64:
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return float64(v), true
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case int32:
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return float64(v), true
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case json.Number:
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f, err := v.Float64()
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return f, err == nil
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default:
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return 0, false
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}
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}
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func writeGeminiErrorFromOpenAI(w http.ResponseWriter, status int, raw []byte) {
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message := strings.TrimSpace(string(raw))
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var parsed map[string]any
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if err := json.Unmarshal(raw, &parsed); err == nil {
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if errObj, ok := parsed["error"].(map[string]any); ok {
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if msg, ok := errObj["message"].(string); ok && strings.TrimSpace(msg) != "" {
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message = strings.TrimSpace(msg)
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}
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}
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}
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if message == "" {
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message = http.StatusText(status)
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}
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writeGeminiError(w, status, message)
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}
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//nolint:unused // retained for native Gemini non-stream handling path.
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func (h *Handler) handleNonStreamGenerateContent(w http.ResponseWriter, resp *http.Response, model, finalPrompt string, thinkingEnabled bool, toolNames []string) {
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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body, _ := io.ReadAll(resp.Body)
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writeGeminiError(w, resp.StatusCode, strings.TrimSpace(string(body)))
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return
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}
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result := sse.CollectStream(resp, thinkingEnabled, true)
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stripReferenceMarkers := h.compatStripReferenceMarkers()
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writeJSON(w, http.StatusOK, buildGeminiGenerateContentResponse(
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model,
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finalPrompt,
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cleanVisibleOutput(result.Thinking, stripReferenceMarkers),
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cleanVisibleOutput(result.Text, stripReferenceMarkers),
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toolNames,
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))
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}
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//nolint:unused // retained for native Gemini non-stream handling path.
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func buildGeminiGenerateContentResponse(model, finalPrompt, finalThinking, finalText string, toolNames []string) map[string]any {
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parts := buildGeminiPartsFromFinal(finalText, finalThinking, toolNames)
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usage := buildGeminiUsage(finalPrompt, finalThinking, finalText)
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return map[string]any{
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"candidates": []map[string]any{
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{
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"index": 0,
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"content": map[string]any{
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"role": "model",
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"parts": parts,
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},
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"finishReason": "STOP",
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},
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},
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"modelVersion": model,
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"usageMetadata": usage,
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}
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}
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//nolint:unused // retained for native Gemini non-stream handling path.
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func buildGeminiUsage(finalPrompt, finalThinking, finalText string) map[string]any {
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promptTokens := util.EstimateTokens(finalPrompt)
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reasoningTokens := util.EstimateTokens(finalThinking)
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completionTokens := util.EstimateTokens(finalText)
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return map[string]any{
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"promptTokenCount": promptTokens,
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"candidatesTokenCount": reasoningTokens + completionTokens,
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"totalTokenCount": promptTokens + reasoningTokens + completionTokens,
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}
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}
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//nolint:unused // retained for native Gemini non-stream handling path.
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func buildGeminiPartsFromFinal(finalText, finalThinking string, toolNames []string) []map[string]any {
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detected := toolcall.ParseToolCalls(finalText, toolNames)
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if len(detected) == 0 && finalThinking != "" {
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detected = toolcall.ParseToolCalls(finalThinking, toolNames)
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}
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if len(detected) > 0 {
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parts := make([]map[string]any, 0, len(detected))
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for _, tc := range detected {
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parts = append(parts, map[string]any{
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"functionCall": map[string]any{
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"name": tc.Name,
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"args": tc.Input,
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},
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})
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}
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return parts
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}
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text := finalText
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if text == "" {
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text = finalThinking
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}
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return []map[string]any{{"text": text}}
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}
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