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600
internal/translator/openai/gemini/openai_gemini_response.go
Normal file
600
internal/translator/openai/gemini/openai_gemini_response.go
Normal file
@@ -0,0 +1,600 @@
|
||||
// Package gemini provides response translation functionality for OpenAI to Gemini API.
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// This package handles the conversion of OpenAI Chat Completions API responses into Gemini API-compatible
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// JSON format, transforming streaming events and non-streaming responses into the format
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// expected by Gemini API clients. It supports both streaming and non-streaming modes,
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// handling text content, tool calls, and usage metadata appropriately.
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package gemini
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import (
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"bytes"
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"context"
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"encoding/json"
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"strconv"
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"strings"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// ConvertOpenAIResponseToGeminiParams holds parameters for response conversion
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type ConvertOpenAIResponseToGeminiParams struct {
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// Tool calls accumulator for streaming
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ToolCallsAccumulator map[int]*ToolCallAccumulator
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// Content accumulator for streaming
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ContentAccumulator strings.Builder
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// Track if this is the first chunk
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IsFirstChunk bool
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}
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// ToolCallAccumulator holds the state for accumulating tool call data
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type ToolCallAccumulator struct {
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ID string
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Name string
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Arguments strings.Builder
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}
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// ConvertOpenAIResponseToGemini converts OpenAI Chat Completions streaming response format to Gemini API format.
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// This function processes OpenAI streaming chunks and transforms them into Gemini-compatible JSON responses.
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// It handles text content, tool calls, and usage metadata, outputting responses that match the Gemini API format.
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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 OpenAI 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 slice of strings, each containing a Gemini-compatible JSON response.
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func ConvertOpenAIResponseToGemini(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) []string {
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if *param == nil {
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*param = &ConvertOpenAIResponseToGeminiParams{
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ToolCallsAccumulator: nil,
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ContentAccumulator: strings.Builder{},
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IsFirstChunk: false,
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}
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}
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// Handle [DONE] marker
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if strings.TrimSpace(string(rawJSON)) == "[DONE]" {
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return []string{}
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}
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|
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if bytes.HasPrefix(rawJSON, []byte("data:")) {
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rawJSON = bytes.TrimSpace(rawJSON[5:])
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}
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root := gjson.ParseBytes(rawJSON)
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// Initialize accumulators if needed
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if (*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator == nil {
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(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator = make(map[int]*ToolCallAccumulator)
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}
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// Process choices
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if choices := root.Get("choices"); choices.Exists() && choices.IsArray() {
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// Handle empty choices array (usage-only chunk)
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if len(choices.Array()) == 0 {
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// This is a usage-only chunk, handle usage and return
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if usage := root.Get("usage"); usage.Exists() {
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template := `{"candidates":[],"usageMetadata":{}}`
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// Set model if available
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if model := root.Get("model"); model.Exists() {
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template, _ = sjson.Set(template, "model", model.String())
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}
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usageObj := map[string]interface{}{
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"promptTokenCount": usage.Get("prompt_tokens").Int(),
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"candidatesTokenCount": usage.Get("completion_tokens").Int(),
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"totalTokenCount": usage.Get("total_tokens").Int(),
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||||
}
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template, _ = sjson.Set(template, "usageMetadata", usageObj)
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return []string{template}
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}
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return []string{}
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}
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|
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var results []string
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choices.ForEach(func(choiceIndex, choice gjson.Result) bool {
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// Base Gemini response template
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template := `{"candidates":[{"content":{"parts":[],"role":"model"},"finishReason":"STOP","index":0}]}`
|
||||
|
||||
// Set model if available
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if model := root.Get("model"); model.Exists() {
|
||||
template, _ = sjson.Set(template, "model", model.String())
|
||||
}
|
||||
|
||||
_ = int(choice.Get("index").Int()) // choiceIdx not used in streaming
|
||||
delta := choice.Get("delta")
|
||||
|
||||
// Handle role (only in first chunk)
|
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if role := delta.Get("role"); role.Exists() && (*param).(*ConvertOpenAIResponseToGeminiParams).IsFirstChunk {
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||||
// OpenAI assistant -> Gemini model
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if role.String() == "assistant" {
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template, _ = sjson.Set(template, "candidates.0.content.role", "model")
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}
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(*param).(*ConvertOpenAIResponseToGeminiParams).IsFirstChunk = false
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results = append(results, template)
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return true
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}
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// Handle content delta
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if content := delta.Get("content"); content.Exists() && content.String() != "" {
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contentText := content.String()
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(*param).(*ConvertOpenAIResponseToGeminiParams).ContentAccumulator.WriteString(contentText)
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// Create text part for this delta
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parts := []interface{}{
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||||
map[string]interface{}{
|
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"text": contentText,
|
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},
|
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}
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template, _ = sjson.Set(template, "candidates.0.content.parts", parts)
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results = append(results, template)
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return true
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||||
}
|
||||
|
||||
// Handle tool calls delta
|
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if toolCalls := delta.Get("tool_calls"); toolCalls.Exists() && toolCalls.IsArray() {
|
||||
toolCalls.ForEach(func(_, toolCall gjson.Result) bool {
|
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toolIndex := int(toolCall.Get("index").Int())
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||||
toolID := toolCall.Get("id").String()
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||||
toolType := toolCall.Get("type").String()
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||||
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if toolType == "function" {
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function := toolCall.Get("function")
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functionName := function.Get("name").String()
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functionArgs := function.Get("arguments").String()
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// Initialize accumulator if needed
|
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if _, exists := (*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator[toolIndex]; !exists {
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(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator[toolIndex] = &ToolCallAccumulator{
|
||||
ID: toolID,
|
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Name: functionName,
|
||||
}
|
||||
}
|
||||
|
||||
// Update ID if provided
|
||||
if toolID != "" {
|
||||
(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator[toolIndex].ID = toolID
|
||||
}
|
||||
|
||||
// Update name if provided
|
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if functionName != "" {
|
||||
(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator[toolIndex].Name = functionName
|
||||
}
|
||||
|
||||
// Accumulate arguments
|
||||
if functionArgs != "" {
|
||||
(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator[toolIndex].Arguments.WriteString(functionArgs)
|
||||
}
|
||||
}
|
||||
return true
|
||||
})
|
||||
|
||||
// Don't output anything for tool call deltas - wait for completion
|
||||
return true
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}
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|
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// Handle finish reason
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if finishReason := choice.Get("finish_reason"); finishReason.Exists() {
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geminiFinishReason := mapOpenAIFinishReasonToGemini(finishReason.String())
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template, _ = sjson.Set(template, "candidates.0.finishReason", geminiFinishReason)
|
||||
|
||||
// If we have accumulated tool calls, output them now
|
||||
if len((*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator) > 0 {
|
||||
var parts []interface{}
|
||||
for _, accumulator := range (*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator {
|
||||
argsStr := accumulator.Arguments.String()
|
||||
var argsMap map[string]interface{}
|
||||
|
||||
argsMap = parseArgsToMap(argsStr)
|
||||
|
||||
functionCallPart := map[string]interface{}{
|
||||
"functionCall": map[string]interface{}{
|
||||
"name": accumulator.Name,
|
||||
"args": argsMap,
|
||||
},
|
||||
}
|
||||
parts = append(parts, functionCallPart)
|
||||
}
|
||||
|
||||
if len(parts) > 0 {
|
||||
template, _ = sjson.Set(template, "candidates.0.content.parts", parts)
|
||||
}
|
||||
|
||||
// Clear accumulators
|
||||
(*param).(*ConvertOpenAIResponseToGeminiParams).ToolCallsAccumulator = make(map[int]*ToolCallAccumulator)
|
||||
}
|
||||
|
||||
results = append(results, template)
|
||||
return true
|
||||
}
|
||||
|
||||
// Handle usage information
|
||||
if usage := root.Get("usage"); usage.Exists() {
|
||||
usageObj := map[string]interface{}{
|
||||
"promptTokenCount": usage.Get("prompt_tokens").Int(),
|
||||
"candidatesTokenCount": usage.Get("completion_tokens").Int(),
|
||||
"totalTokenCount": usage.Get("total_tokens").Int(),
|
||||
}
|
||||
template, _ = sjson.Set(template, "usageMetadata", usageObj)
|
||||
results = append(results, template)
|
||||
return true
|
||||
}
|
||||
|
||||
return true
|
||||
})
|
||||
return results
|
||||
}
|
||||
return []string{}
|
||||
}
|
||||
|
||||
// mapOpenAIFinishReasonToGemini maps OpenAI finish reasons to Gemini finish reasons
|
||||
func mapOpenAIFinishReasonToGemini(openAIReason string) string {
|
||||
switch openAIReason {
|
||||
case "stop":
|
||||
return "STOP"
|
||||
case "length":
|
||||
return "MAX_TOKENS"
|
||||
case "tool_calls":
|
||||
return "STOP" // Gemini doesn't have a specific tool_calls finish reason
|
||||
case "content_filter":
|
||||
return "SAFETY"
|
||||
default:
|
||||
return "STOP"
|
||||
}
|
||||
}
|
||||
|
||||
// parseArgsToMap safely parses a JSON string of function arguments into a map.
|
||||
// It returns an empty map if the input is empty or cannot be parsed as a JSON object.
|
||||
func parseArgsToMap(argsStr string) map[string]interface{} {
|
||||
trimmed := strings.TrimSpace(argsStr)
|
||||
if trimmed == "" || trimmed == "{}" {
|
||||
return map[string]interface{}{}
|
||||
}
|
||||
|
||||
// First try strict JSON
|
||||
var out map[string]interface{}
|
||||
if errUnmarshal := json.Unmarshal([]byte(trimmed), &out); errUnmarshal == nil {
|
||||
return out
|
||||
}
|
||||
|
||||
// Tolerant parse: handle streams where values are barewords (e.g., 北京, celsius)
|
||||
tolerant := tolerantParseJSONMap(trimmed)
|
||||
if len(tolerant) > 0 {
|
||||
return tolerant
|
||||
}
|
||||
|
||||
// Fallback: return empty object when parsing fails
|
||||
return map[string]interface{}{}
|
||||
}
|
||||
|
||||
// tolerantParseJSONMap attempts to parse a JSON-like object string into a map, tolerating
|
||||
// bareword values (unquoted strings) commonly seen during streamed tool calls.
|
||||
// Example input: {"location": 北京, "unit": celsius}
|
||||
func tolerantParseJSONMap(s string) map[string]interface{} {
|
||||
// Ensure we operate within the outermost braces if present
|
||||
start := strings.Index(s, "{")
|
||||
end := strings.LastIndex(s, "}")
|
||||
if start == -1 || end == -1 || start >= end {
|
||||
return map[string]interface{}{}
|
||||
}
|
||||
content := s[start+1 : end]
|
||||
|
||||
runes := []rune(content)
|
||||
n := len(runes)
|
||||
i := 0
|
||||
result := make(map[string]interface{})
|
||||
|
||||
for i < n {
|
||||
// Skip whitespace and commas
|
||||
for i < n && (runes[i] == ' ' || runes[i] == '\n' || runes[i] == '\r' || runes[i] == '\t' || runes[i] == ',') {
|
||||
i++
|
||||
}
|
||||
if i >= n {
|
||||
break
|
||||
}
|
||||
|
||||
// Expect quoted key
|
||||
if runes[i] != '"' {
|
||||
// Unable to parse this segment reliably; skip to next comma
|
||||
for i < n && runes[i] != ',' {
|
||||
i++
|
||||
}
|
||||
continue
|
||||
}
|
||||
|
||||
// Parse JSON string for key
|
||||
keyToken, nextIdx := parseJSONStringRunes(runes, i)
|
||||
if nextIdx == -1 {
|
||||
break
|
||||
}
|
||||
keyName := jsonStringTokenToRawString(keyToken)
|
||||
i = nextIdx
|
||||
|
||||
// Skip whitespace
|
||||
for i < n && (runes[i] == ' ' || runes[i] == '\n' || runes[i] == '\r' || runes[i] == '\t') {
|
||||
i++
|
||||
}
|
||||
if i >= n || runes[i] != ':' {
|
||||
break
|
||||
}
|
||||
i++ // skip ':'
|
||||
// Skip whitespace
|
||||
for i < n && (runes[i] == ' ' || runes[i] == '\n' || runes[i] == '\r' || runes[i] == '\t') {
|
||||
i++
|
||||
}
|
||||
if i >= n {
|
||||
break
|
||||
}
|
||||
|
||||
// Parse value (string, number, object/array, bareword)
|
||||
var value interface{}
|
||||
switch runes[i] {
|
||||
case '"':
|
||||
// JSON string
|
||||
valToken, ni := parseJSONStringRunes(runes, i)
|
||||
if ni == -1 {
|
||||
// Malformed; treat as empty string
|
||||
value = ""
|
||||
i = n
|
||||
} else {
|
||||
value = jsonStringTokenToRawString(valToken)
|
||||
i = ni
|
||||
}
|
||||
case '{', '[':
|
||||
// Bracketed value: attempt to capture balanced structure
|
||||
seg, ni := captureBracketed(runes, i)
|
||||
if ni == -1 {
|
||||
i = n
|
||||
} else {
|
||||
var anyVal interface{}
|
||||
if errUnmarshal := json.Unmarshal([]byte(seg), &anyVal); errUnmarshal == nil {
|
||||
value = anyVal
|
||||
} else {
|
||||
value = seg
|
||||
}
|
||||
i = ni
|
||||
}
|
||||
default:
|
||||
// Bare token until next comma or end
|
||||
j := i
|
||||
for j < n && runes[j] != ',' {
|
||||
j++
|
||||
}
|
||||
token := strings.TrimSpace(string(runes[i:j]))
|
||||
// Interpret common JSON atoms and numbers; otherwise treat as string
|
||||
if token == "true" {
|
||||
value = true
|
||||
} else if token == "false" {
|
||||
value = false
|
||||
} else if token == "null" {
|
||||
value = nil
|
||||
} else if numVal, ok := tryParseNumber(token); ok {
|
||||
value = numVal
|
||||
} else {
|
||||
value = token
|
||||
}
|
||||
i = j
|
||||
}
|
||||
|
||||
result[keyName] = value
|
||||
|
||||
// Skip trailing whitespace and optional comma before next pair
|
||||
for i < n && (runes[i] == ' ' || runes[i] == '\n' || runes[i] == '\r' || runes[i] == '\t') {
|
||||
i++
|
||||
}
|
||||
if i < n && runes[i] == ',' {
|
||||
i++
|
||||
}
|
||||
}
|
||||
|
||||
return result
|
||||
}
|
||||
|
||||
// parseJSONStringRunes returns the JSON string token (including quotes) and the index just after it.
|
||||
func parseJSONStringRunes(runes []rune, start int) (string, int) {
|
||||
if start >= len(runes) || runes[start] != '"' {
|
||||
return "", -1
|
||||
}
|
||||
i := start + 1
|
||||
escaped := false
|
||||
for i < len(runes) {
|
||||
r := runes[i]
|
||||
if r == '\\' && !escaped {
|
||||
escaped = true
|
||||
i++
|
||||
continue
|
||||
}
|
||||
if r == '"' && !escaped {
|
||||
return string(runes[start : i+1]), i + 1
|
||||
}
|
||||
escaped = false
|
||||
i++
|
||||
}
|
||||
return string(runes[start:]), -1
|
||||
}
|
||||
|
||||
// jsonStringTokenToRawString converts a JSON string token (including quotes) to a raw Go string value.
|
||||
func jsonStringTokenToRawString(token string) string {
|
||||
var s string
|
||||
if errUnmarshal := json.Unmarshal([]byte(token), &s); errUnmarshal == nil {
|
||||
return s
|
||||
}
|
||||
// Fallback: strip surrounding quotes if present
|
||||
if len(token) >= 2 && token[0] == '"' && token[len(token)-1] == '"' {
|
||||
return token[1 : len(token)-1]
|
||||
}
|
||||
return token
|
||||
}
|
||||
|
||||
// captureBracketed captures a balanced JSON object/array starting at index i.
|
||||
// Returns the segment string and the index just after it; -1 if malformed.
|
||||
func captureBracketed(runes []rune, i int) (string, int) {
|
||||
if i >= len(runes) {
|
||||
return "", -1
|
||||
}
|
||||
startRune := runes[i]
|
||||
var endRune rune
|
||||
if startRune == '{' {
|
||||
endRune = '}'
|
||||
} else if startRune == '[' {
|
||||
endRune = ']'
|
||||
} else {
|
||||
return "", -1
|
||||
}
|
||||
depth := 0
|
||||
j := i
|
||||
inStr := false
|
||||
escaped := false
|
||||
for j < len(runes) {
|
||||
r := runes[j]
|
||||
if inStr {
|
||||
if r == '\\' && !escaped {
|
||||
escaped = true
|
||||
j++
|
||||
continue
|
||||
}
|
||||
if r == '"' && !escaped {
|
||||
inStr = false
|
||||
} else {
|
||||
escaped = false
|
||||
}
|
||||
j++
|
||||
continue
|
||||
}
|
||||
if r == '"' {
|
||||
inStr = true
|
||||
j++
|
||||
continue
|
||||
}
|
||||
if r == startRune {
|
||||
depth++
|
||||
} else if r == endRune {
|
||||
depth--
|
||||
if depth == 0 {
|
||||
return string(runes[i : j+1]), j + 1
|
||||
}
|
||||
}
|
||||
j++
|
||||
}
|
||||
return string(runes[i:]), -1
|
||||
}
|
||||
|
||||
// tryParseNumber attempts to parse a string as an int or float.
|
||||
func tryParseNumber(s string) (interface{}, bool) {
|
||||
if s == "" {
|
||||
return nil, false
|
||||
}
|
||||
// Try integer
|
||||
if i64, errParseInt := strconv.ParseInt(s, 10, 64); errParseInt == nil {
|
||||
return i64, true
|
||||
}
|
||||
if u64, errParseUInt := strconv.ParseUint(s, 10, 64); errParseUInt == nil {
|
||||
return u64, true
|
||||
}
|
||||
if f64, errParseFloat := strconv.ParseFloat(s, 64); errParseFloat == nil {
|
||||
return f64, true
|
||||
}
|
||||
return nil, false
|
||||
}
|
||||
|
||||
// ConvertOpenAIResponseToGeminiNonStream converts a non-streaming OpenAI response to a non-streaming Gemini response.
|
||||
//
|
||||
// Parameters:
|
||||
// - ctx: The context for the request.
|
||||
// - modelName: The name of the model.
|
||||
// - rawJSON: The raw JSON response from the OpenAI API.
|
||||
// - param: A pointer to a parameter object for the conversion.
|
||||
//
|
||||
// Returns:
|
||||
// - string: A Gemini-compatible JSON response.
|
||||
func ConvertOpenAIResponseToGeminiNonStream(_ context.Context, _ string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, _ *any) string {
|
||||
root := gjson.ParseBytes(rawJSON)
|
||||
|
||||
// Base Gemini response template
|
||||
out := `{"candidates":[{"content":{"parts":[],"role":"model"},"finishReason":"STOP","index":0}]}`
|
||||
|
||||
// Set model if available
|
||||
if model := root.Get("model"); model.Exists() {
|
||||
out, _ = sjson.Set(out, "model", model.String())
|
||||
}
|
||||
|
||||
// Process choices
|
||||
if choices := root.Get("choices"); choices.Exists() && choices.IsArray() {
|
||||
choices.ForEach(func(choiceIndex, choice gjson.Result) bool {
|
||||
choiceIdx := int(choice.Get("index").Int())
|
||||
message := choice.Get("message")
|
||||
|
||||
// Set role
|
||||
if role := message.Get("role"); role.Exists() {
|
||||
if role.String() == "assistant" {
|
||||
out, _ = sjson.Set(out, "candidates.0.content.role", "model")
|
||||
}
|
||||
}
|
||||
|
||||
var parts []interface{}
|
||||
|
||||
// Handle content first
|
||||
if content := message.Get("content"); content.Exists() && content.String() != "" {
|
||||
parts = append(parts, map[string]interface{}{
|
||||
"text": content.String(),
|
||||
})
|
||||
}
|
||||
|
||||
// Handle tool calls
|
||||
if toolCalls := message.Get("tool_calls"); toolCalls.Exists() && toolCalls.IsArray() {
|
||||
toolCalls.ForEach(func(_, toolCall gjson.Result) bool {
|
||||
if toolCall.Get("type").String() == "function" {
|
||||
function := toolCall.Get("function")
|
||||
functionName := function.Get("name").String()
|
||||
functionArgs := function.Get("arguments").String()
|
||||
|
||||
// Parse arguments
|
||||
var argsMap map[string]interface{}
|
||||
argsMap = parseArgsToMap(functionArgs)
|
||||
|
||||
functionCallPart := map[string]interface{}{
|
||||
"functionCall": map[string]interface{}{
|
||||
"name": functionName,
|
||||
"args": argsMap,
|
||||
},
|
||||
}
|
||||
parts = append(parts, functionCallPart)
|
||||
}
|
||||
return true
|
||||
})
|
||||
}
|
||||
|
||||
// Set parts
|
||||
if len(parts) > 0 {
|
||||
out, _ = sjson.Set(out, "candidates.0.content.parts", parts)
|
||||
}
|
||||
|
||||
// Handle finish reason
|
||||
if finishReason := choice.Get("finish_reason"); finishReason.Exists() {
|
||||
geminiFinishReason := mapOpenAIFinishReasonToGemini(finishReason.String())
|
||||
out, _ = sjson.Set(out, "candidates.0.finishReason", geminiFinishReason)
|
||||
}
|
||||
|
||||
// Set index
|
||||
out, _ = sjson.Set(out, "candidates.0.index", choiceIdx)
|
||||
|
||||
return true
|
||||
})
|
||||
}
|
||||
|
||||
// Handle usage information
|
||||
if usage := root.Get("usage"); usage.Exists() {
|
||||
usageObj := map[string]interface{}{
|
||||
"promptTokenCount": usage.Get("prompt_tokens").Int(),
|
||||
"candidatesTokenCount": usage.Get("completion_tokens").Int(),
|
||||
"totalTokenCount": usage.Get("total_tokens").Int(),
|
||||
}
|
||||
out, _ = sjson.Set(out, "usageMetadata", usageObj)
|
||||
}
|
||||
|
||||
return out
|
||||
}
|
||||
Reference in New Issue
Block a user