mirror of
https://github.com/router-for-me/CLIProxyAPI.git
synced 2026-02-03 04:50:52 +08:00
c281f4cbaf
fix(translators): rename and integrate `usageMetadata` as `cpaUsageMetadata` in Claude processing logic
525 lines
22 KiB
Go
525 lines
22 KiB
Go
// Package claude provides response translation functionality for Claude Code API compatibility.
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// This package handles the conversion of backend client responses into Claude Code-compatible
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// Server-Sent Events (SSE) format, implementing a sophisticated state machine that manages
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// different response types including text content, thinking processes, and function calls.
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// The translation ensures proper sequencing of SSE events and maintains state across
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// multiple response chunks to provide a seamless streaming experience.
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package claude
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import (
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"bytes"
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"context"
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"fmt"
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"strings"
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"sync/atomic"
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"time"
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"github.com/router-for-me/CLIProxyAPI/v6/internal/cache"
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log "github.com/sirupsen/logrus"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// Params holds parameters for response conversion and maintains state across streaming chunks.
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// This structure tracks the current state of the response translation process to ensure
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// proper sequencing of SSE events and transitions between different content types.
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type Params struct {
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HasFirstResponse bool // Indicates if the initial message_start event has been sent
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ResponseType int // Current response type: 0=none, 1=content, 2=thinking, 3=function
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ResponseIndex int // Index counter for content blocks in the streaming response
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HasFinishReason bool // Tracks whether a finish reason has been observed
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FinishReason string // The finish reason string returned by the provider
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HasUsageMetadata bool // Tracks whether usage metadata has been observed
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PromptTokenCount int64 // Cached prompt token count from usage metadata
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CandidatesTokenCount int64 // Cached candidate token count from usage metadata
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ThoughtsTokenCount int64 // Cached thinking token count from usage metadata
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TotalTokenCount int64 // Cached total token count from usage metadata
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CachedTokenCount int64 // Cached content token count (indicates prompt caching)
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HasSentFinalEvents bool // Indicates if final content/message events have been sent
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HasToolUse bool // Indicates if tool use was observed in the stream
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HasContent bool // Tracks whether any content (text, thinking, or tool use) has been output
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// Signature caching support
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SessionID string // Session ID derived from request for signature caching
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CurrentThinkingText strings.Builder // Accumulates thinking text for signature caching
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}
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// toolUseIDCounter provides a process-wide unique counter for tool use identifiers.
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var toolUseIDCounter uint64
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// ConvertAntigravityResponseToClaude performs sophisticated streaming response format conversion.
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// This function implements a complex state machine that translates backend client responses
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// into Claude Code-compatible Server-Sent Events (SSE) format. It manages different response types
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// and handles state transitions between content blocks, thinking processes, and function calls.
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//
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// Response type states: 0=none, 1=content, 2=thinking, 3=function
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// The function maintains state across multiple calls to ensure proper SSE event sequencing.
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//
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// Parameters:
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// - ctx: The context for the request, used for cancellation and timeout handling
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// - modelName: The name of the model being used for the response (unused in current implementation)
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// - rawJSON: The raw JSON response from the Gemini CLI API
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// - param: A pointer to a parameter object for maintaining state between calls
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//
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// Returns:
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// - []string: A slice of strings, each containing a Claude Code-compatible JSON response
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func ConvertAntigravityResponseToClaude(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) []string {
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if *param == nil {
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*param = &Params{
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HasFirstResponse: false,
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ResponseType: 0,
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ResponseIndex: 0,
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SessionID: deriveSessionID(originalRequestRawJSON),
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}
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}
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params := (*param).(*Params)
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if bytes.Equal(rawJSON, []byte("[DONE]")) {
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output := ""
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// Only send final events if we have actually output content
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if params.HasContent {
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appendFinalEvents(params, &output, true)
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return []string{
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output + "event: message_stop\ndata: {\"type\":\"message_stop\"}\n\n\n",
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}
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}
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return []string{}
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}
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output := ""
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// Initialize the streaming session with a message_start event
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// This is only sent for the very first response chunk to establish the streaming session
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if !params.HasFirstResponse {
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output = "event: message_start\n"
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// Create the initial message structure with default values according to Claude Code API specification
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// This follows the Claude Code API specification for streaming message initialization
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messageStartTemplate := `{"type": "message_start", "message": {"id": "msg_1nZdL29xx5MUA1yADyHTEsnR8uuvGzszyY", "type": "message", "role": "assistant", "content": [], "model": "claude-3-5-sonnet-20241022", "stop_reason": null, "stop_sequence": null, "usage": {"input_tokens": 0, "output_tokens": 0}}}`
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// Use cpaUsageMetadata within the message_start event for Claude.
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if promptTokenCount := gjson.GetBytes(rawJSON, "response.cpaUsageMetadata.promptTokenCount"); promptTokenCount.Exists() {
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messageStartTemplate, _ = sjson.Set(messageStartTemplate, "message.usage.input_tokens", promptTokenCount.Int())
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}
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if candidatesTokenCount := gjson.GetBytes(rawJSON, "response.cpaUsageMetadata.candidatesTokenCount"); candidatesTokenCount.Exists() {
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messageStartTemplate, _ = sjson.Set(messageStartTemplate, "message.usage.output_tokens", candidatesTokenCount.Int())
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}
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// Override default values with actual response metadata if available from the Gemini CLI response
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if modelVersionResult := gjson.GetBytes(rawJSON, "response.modelVersion"); modelVersionResult.Exists() {
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messageStartTemplate, _ = sjson.Set(messageStartTemplate, "message.model", modelVersionResult.String())
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}
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if responseIDResult := gjson.GetBytes(rawJSON, "response.responseId"); responseIDResult.Exists() {
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messageStartTemplate, _ = sjson.Set(messageStartTemplate, "message.id", responseIDResult.String())
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}
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output = output + fmt.Sprintf("data: %s\n\n\n", messageStartTemplate)
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params.HasFirstResponse = true
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}
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// Process the response parts array from the backend client
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// Each part can contain text content, thinking content, or function calls
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partsResult := gjson.GetBytes(rawJSON, "response.candidates.0.content.parts")
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if partsResult.IsArray() {
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partResults := partsResult.Array()
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for i := 0; i < len(partResults); i++ {
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partResult := partResults[i]
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// Extract the different types of content from each part
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partTextResult := partResult.Get("text")
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functionCallResult := partResult.Get("functionCall")
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// Handle text content (both regular content and thinking)
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if partTextResult.Exists() {
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// Process thinking content (internal reasoning)
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if partResult.Get("thought").Bool() {
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if thoughtSignature := partResult.Get("thoughtSignature"); thoughtSignature.Exists() && thoughtSignature.String() != "" {
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log.Debug("Branch: signature_delta")
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if params.SessionID != "" && params.CurrentThinkingText.Len() > 0 {
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cache.CacheSignature(params.SessionID, params.CurrentThinkingText.String(), thoughtSignature.String())
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log.Debugf("Cached signature for thinking block (sessionID=%s, textLen=%d)", params.SessionID, params.CurrentThinkingText.Len())
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params.CurrentThinkingText.Reset()
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}
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output = output + "event: content_block_delta\n"
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data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":""}}`, params.ResponseIndex), "delta.signature", thoughtSignature.String())
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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params.HasContent = true
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} else if params.ResponseType == 2 { // Continue existing thinking block if already in thinking state
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params.CurrentThinkingText.WriteString(partTextResult.String())
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output = output + "event: content_block_delta\n"
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data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"thinking_delta","thinking":""}}`, params.ResponseIndex), "delta.thinking", partTextResult.String())
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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params.HasContent = true
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} else {
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// Transition from another state to thinking
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// First, close any existing content block
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if params.ResponseType != 0 {
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if params.ResponseType == 2 {
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// output = output + "event: content_block_delta\n"
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// output = output + fmt.Sprintf(`data: {"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":null}}`, params.ResponseIndex)
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// output = output + "\n\n\n"
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}
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output = output + "event: content_block_stop\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
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output = output + "\n\n\n"
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params.ResponseIndex++
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}
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// Start a new thinking content block
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output = output + "event: content_block_start\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_start","index":%d,"content_block":{"type":"thinking","thinking":""}}`, params.ResponseIndex)
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output = output + "\n\n\n"
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output = output + "event: content_block_delta\n"
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data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"thinking_delta","thinking":""}}`, params.ResponseIndex), "delta.thinking", partTextResult.String())
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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params.ResponseType = 2 // Set state to thinking
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params.HasContent = true
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// Start accumulating thinking text for signature caching
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params.CurrentThinkingText.Reset()
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params.CurrentThinkingText.WriteString(partTextResult.String())
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}
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} else {
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finishReasonResult := gjson.GetBytes(rawJSON, "response.candidates.0.finishReason")
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if partTextResult.String() != "" || !finishReasonResult.Exists() {
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// Process regular text content (user-visible output)
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// Continue existing text block if already in content state
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if params.ResponseType == 1 {
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output = output + "event: content_block_delta\n"
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data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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params.HasContent = true
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} else {
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// Transition from another state to text content
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// First, close any existing content block
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if params.ResponseType != 0 {
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if params.ResponseType == 2 {
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// output = output + "event: content_block_delta\n"
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// output = output + fmt.Sprintf(`data: {"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":null}}`, params.ResponseIndex)
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// output = output + "\n\n\n"
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}
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output = output + "event: content_block_stop\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
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output = output + "\n\n\n"
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params.ResponseIndex++
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}
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if partTextResult.String() != "" {
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// Start a new text content block
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output = output + "event: content_block_start\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_start","index":%d,"content_block":{"type":"text","text":""}}`, params.ResponseIndex)
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output = output + "\n\n\n"
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output = output + "event: content_block_delta\n"
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data, _ := sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"text_delta","text":""}}`, params.ResponseIndex), "delta.text", partTextResult.String())
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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params.ResponseType = 1 // Set state to content
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params.HasContent = true
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}
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}
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}
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}
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} else if functionCallResult.Exists() {
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// Handle function/tool calls from the AI model
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// This processes tool usage requests and formats them for Claude Code API compatibility
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params.HasToolUse = true
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fcName := functionCallResult.Get("name").String()
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// Handle state transitions when switching to function calls
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// Close any existing function call block first
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if params.ResponseType == 3 {
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output = output + "event: content_block_stop\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
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output = output + "\n\n\n"
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params.ResponseIndex++
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params.ResponseType = 0
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}
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// Special handling for thinking state transition
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if params.ResponseType == 2 {
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// output = output + "event: content_block_delta\n"
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// output = output + fmt.Sprintf(`data: {"type":"content_block_delta","index":%d,"delta":{"type":"signature_delta","signature":null}}`, params.ResponseIndex)
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// output = output + "\n\n\n"
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}
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// Close any other existing content block
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if params.ResponseType != 0 {
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output = output + "event: content_block_stop\n"
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output = output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
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output = output + "\n\n\n"
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params.ResponseIndex++
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}
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// Start a new tool use content block
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// This creates the structure for a function call in Claude Code format
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output = output + "event: content_block_start\n"
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// Create the tool use block with unique ID and function details
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data := fmt.Sprintf(`{"type":"content_block_start","index":%d,"content_block":{"type":"tool_use","id":"","name":"","input":{}}}`, params.ResponseIndex)
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data, _ = sjson.Set(data, "content_block.id", fmt.Sprintf("%s-%d-%d", fcName, time.Now().UnixNano(), atomic.AddUint64(&toolUseIDCounter, 1)))
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data, _ = sjson.Set(data, "content_block.name", fcName)
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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if fcArgsResult := functionCallResult.Get("args"); fcArgsResult.Exists() {
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output = output + "event: content_block_delta\n"
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data, _ = sjson.Set(fmt.Sprintf(`{"type":"content_block_delta","index":%d,"delta":{"type":"input_json_delta","partial_json":""}}`, params.ResponseIndex), "delta.partial_json", fcArgsResult.Raw)
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output = output + fmt.Sprintf("data: %s\n\n\n", data)
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}
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params.ResponseType = 3
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params.HasContent = true
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}
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}
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}
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if finishReasonResult := gjson.GetBytes(rawJSON, "response.candidates.0.finishReason"); finishReasonResult.Exists() {
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params.HasFinishReason = true
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params.FinishReason = finishReasonResult.String()
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}
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if usageResult := gjson.GetBytes(rawJSON, "response.usageMetadata"); usageResult.Exists() {
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params.HasUsageMetadata = true
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params.CachedTokenCount = usageResult.Get("cachedContentTokenCount").Int()
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params.PromptTokenCount = usageResult.Get("promptTokenCount").Int() - params.CachedTokenCount
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params.CandidatesTokenCount = usageResult.Get("candidatesTokenCount").Int()
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params.ThoughtsTokenCount = usageResult.Get("thoughtsTokenCount").Int()
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params.TotalTokenCount = usageResult.Get("totalTokenCount").Int()
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if params.CandidatesTokenCount == 0 && params.TotalTokenCount > 0 {
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params.CandidatesTokenCount = params.TotalTokenCount - params.PromptTokenCount - params.ThoughtsTokenCount
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if params.CandidatesTokenCount < 0 {
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params.CandidatesTokenCount = 0
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}
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}
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}
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if params.HasUsageMetadata && params.HasFinishReason {
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appendFinalEvents(params, &output, false)
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}
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return []string{output}
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}
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func appendFinalEvents(params *Params, output *string, force bool) {
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if params.HasSentFinalEvents {
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return
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}
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if !params.HasUsageMetadata && !force {
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return
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}
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// Only send final events if we have actually output content
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if !params.HasContent {
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return
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}
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if params.ResponseType != 0 {
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*output = *output + "event: content_block_stop\n"
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*output = *output + fmt.Sprintf(`data: {"type":"content_block_stop","index":%d}`, params.ResponseIndex)
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*output = *output + "\n\n\n"
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params.ResponseType = 0
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}
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stopReason := resolveStopReason(params)
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usageOutputTokens := params.CandidatesTokenCount + params.ThoughtsTokenCount
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if usageOutputTokens == 0 && params.TotalTokenCount > 0 {
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usageOutputTokens = params.TotalTokenCount - params.PromptTokenCount
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if usageOutputTokens < 0 {
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usageOutputTokens = 0
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}
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}
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*output = *output + "event: message_delta\n"
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*output = *output + "data: "
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delta := fmt.Sprintf(`{"type":"message_delta","delta":{"stop_reason":"%s","stop_sequence":null},"usage":{"input_tokens":%d,"output_tokens":%d}}`, stopReason, params.PromptTokenCount, usageOutputTokens)
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// Add cache_read_input_tokens if cached tokens are present (indicates prompt caching is working)
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if params.CachedTokenCount > 0 {
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var err error
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delta, err = sjson.Set(delta, "usage.cache_read_input_tokens", params.CachedTokenCount)
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if err != nil {
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log.Warnf("antigravity claude response: failed to set cache_read_input_tokens: %v", err)
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}
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}
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*output = *output + delta + "\n\n\n"
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params.HasSentFinalEvents = true
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}
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func resolveStopReason(params *Params) string {
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if params.HasToolUse {
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return "tool_use"
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}
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switch params.FinishReason {
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case "MAX_TOKENS":
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return "max_tokens"
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case "STOP", "FINISH_REASON_UNSPECIFIED", "UNKNOWN":
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return "end_turn"
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}
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return "end_turn"
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}
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// ConvertAntigravityResponseToClaudeNonStream converts a non-streaming Gemini CLI response to a non-streaming Claude response.
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//
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// Parameters:
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// - ctx: The context for the request.
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// - modelName: The name of the model.
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// - rawJSON: The raw JSON response from the Gemini CLI API.
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// - param: A pointer to a parameter object for the conversion.
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//
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// Returns:
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// - string: A Claude-compatible JSON response.
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func ConvertAntigravityResponseToClaudeNonStream(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, _ *any) string {
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_ = originalRequestRawJSON
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_ = requestRawJSON
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root := gjson.ParseBytes(rawJSON)
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promptTokens := root.Get("response.usageMetadata.promptTokenCount").Int()
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candidateTokens := root.Get("response.usageMetadata.candidatesTokenCount").Int()
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thoughtTokens := root.Get("response.usageMetadata.thoughtsTokenCount").Int()
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totalTokens := root.Get("response.usageMetadata.totalTokenCount").Int()
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cachedTokens := root.Get("response.usageMetadata.cachedContentTokenCount").Int()
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outputTokens := candidateTokens + thoughtTokens
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if outputTokens == 0 && totalTokens > 0 {
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outputTokens = totalTokens - promptTokens
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if outputTokens < 0 {
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outputTokens = 0
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}
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}
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responseJSON := `{"id":"","type":"message","role":"assistant","model":"","content":null,"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}`
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responseJSON, _ = sjson.Set(responseJSON, "id", root.Get("response.responseId").String())
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responseJSON, _ = sjson.Set(responseJSON, "model", root.Get("response.modelVersion").String())
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responseJSON, _ = sjson.Set(responseJSON, "usage.input_tokens", promptTokens)
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responseJSON, _ = sjson.Set(responseJSON, "usage.output_tokens", outputTokens)
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// Add cache_read_input_tokens if cached tokens are present (indicates prompt caching is working)
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if cachedTokens > 0 {
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var err error
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responseJSON, err = sjson.Set(responseJSON, "usage.cache_read_input_tokens", cachedTokens)
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if err != nil {
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log.Warnf("antigravity claude response: failed to set cache_read_input_tokens: %v", err)
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}
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}
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contentArrayInitialized := false
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ensureContentArray := func() {
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if contentArrayInitialized {
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return
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}
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responseJSON, _ = sjson.SetRaw(responseJSON, "content", "[]")
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contentArrayInitialized = true
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}
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parts := root.Get("response.candidates.0.content.parts")
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textBuilder := strings.Builder{}
|
|
thinkingBuilder := strings.Builder{}
|
|
thinkingSignature := ""
|
|
toolIDCounter := 0
|
|
hasToolCall := false
|
|
|
|
flushText := func() {
|
|
if textBuilder.Len() == 0 {
|
|
return
|
|
}
|
|
ensureContentArray()
|
|
block := `{"type":"text","text":""}`
|
|
block, _ = sjson.Set(block, "text", textBuilder.String())
|
|
responseJSON, _ = sjson.SetRaw(responseJSON, "content.-1", block)
|
|
textBuilder.Reset()
|
|
}
|
|
|
|
flushThinking := func() {
|
|
if thinkingBuilder.Len() == 0 && thinkingSignature == "" {
|
|
return
|
|
}
|
|
ensureContentArray()
|
|
block := `{"type":"thinking","thinking":""}`
|
|
block, _ = sjson.Set(block, "thinking", thinkingBuilder.String())
|
|
if thinkingSignature != "" {
|
|
block, _ = sjson.Set(block, "signature", thinkingSignature)
|
|
}
|
|
responseJSON, _ = sjson.SetRaw(responseJSON, "content.-1", block)
|
|
thinkingBuilder.Reset()
|
|
thinkingSignature = ""
|
|
}
|
|
|
|
if parts.IsArray() {
|
|
for _, part := range parts.Array() {
|
|
isThought := part.Get("thought").Bool()
|
|
if isThought {
|
|
sig := part.Get("thoughtSignature")
|
|
if !sig.Exists() {
|
|
sig = part.Get("thought_signature")
|
|
}
|
|
if sig.Exists() && sig.String() != "" {
|
|
thinkingSignature = sig.String()
|
|
}
|
|
}
|
|
|
|
if text := part.Get("text"); text.Exists() && text.String() != "" {
|
|
if isThought {
|
|
flushText()
|
|
thinkingBuilder.WriteString(text.String())
|
|
continue
|
|
}
|
|
flushThinking()
|
|
textBuilder.WriteString(text.String())
|
|
continue
|
|
}
|
|
|
|
if functionCall := part.Get("functionCall"); functionCall.Exists() {
|
|
flushThinking()
|
|
flushText()
|
|
hasToolCall = true
|
|
|
|
name := functionCall.Get("name").String()
|
|
toolIDCounter++
|
|
toolBlock := `{"type":"tool_use","id":"","name":"","input":{}}`
|
|
toolBlock, _ = sjson.Set(toolBlock, "id", fmt.Sprintf("tool_%d", toolIDCounter))
|
|
toolBlock, _ = sjson.Set(toolBlock, "name", name)
|
|
|
|
if args := functionCall.Get("args"); args.Exists() && args.Raw != "" && gjson.Valid(args.Raw) && args.IsObject() {
|
|
toolBlock, _ = sjson.SetRaw(toolBlock, "input", args.Raw)
|
|
}
|
|
|
|
ensureContentArray()
|
|
responseJSON, _ = sjson.SetRaw(responseJSON, "content.-1", toolBlock)
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
flushThinking()
|
|
flushText()
|
|
|
|
stopReason := "end_turn"
|
|
if hasToolCall {
|
|
stopReason = "tool_use"
|
|
} else {
|
|
if finish := root.Get("response.candidates.0.finishReason"); finish.Exists() {
|
|
switch finish.String() {
|
|
case "MAX_TOKENS":
|
|
stopReason = "max_tokens"
|
|
case "STOP", "FINISH_REASON_UNSPECIFIED", "UNKNOWN":
|
|
stopReason = "end_turn"
|
|
default:
|
|
stopReason = "end_turn"
|
|
}
|
|
}
|
|
}
|
|
responseJSON, _ = sjson.Set(responseJSON, "stop_reason", stopReason)
|
|
|
|
if promptTokens == 0 && outputTokens == 0 {
|
|
if usageMeta := root.Get("response.usageMetadata"); !usageMeta.Exists() {
|
|
responseJSON, _ = sjson.Delete(responseJSON, "usage")
|
|
}
|
|
}
|
|
|
|
return responseJSON
|
|
}
|
|
|
|
func ClaudeTokenCount(ctx context.Context, count int64) string {
|
|
return fmt.Sprintf(`{"input_tokens":%d}`, count)
|
|
}
|