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fix(translator): normalize and restrict stop_reason/finish_reason usage

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- Standardized the handling of `stop_reason` and `finish_reason` across Codex and Gemini responses.
- Restricted pass-through of specific reasons (`max_tokens`, `stop`) for consistency.
- Enhanced fallback logic for undefined reasons.
This commit is contained in:
Luis Pater
2026-02-07 02:07:51 +08:00
parent 394497fb2f
commit 80b5e79e75
3 changed files with 33 additions and 11 deletions
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19
internal/translator/gemini/openai/chat-completions/gemini_openai_response.go
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@@ -129,11 +129,16 @@ func ConvertGeminiResponseToOpenAI(_ context.Context, _ string, originalRequestR
candidateIndex := int(candidate.Get("index").Int())
template, _ = sjson.Set(template, "choices.0.index", candidateIndex)
// Extract and set the finish reason.
if finishReasonResult := candidate.Get("finishReason"); finishReasonResult.Exists() {
template, _ = sjson.Set(template, "choices.0.finish_reason", strings.ToLower(finishReasonResult.String()))
template, _ = sjson.Set(template, "choices.0.native_finish_reason", strings.ToLower(finishReasonResult.String()))
finishReason := ""
if stopReasonResult := gjson.GetBytes(rawJSON, "stop_reason"); stopReasonResult.Exists() {
finishReason = stopReasonResult.String()
}
if finishReason == "" {
if finishReasonResult := gjson.GetBytes(rawJSON, "candidates.0.finishReason"); finishReasonResult.Exists() {
finishReason = finishReasonResult.String()
}
}
finishReason = strings.ToLower(finishReason)
partsResult := candidate.Get("content.parts")
hasFunctionCall := false
@@ -225,6 +230,12 @@ func ConvertGeminiResponseToOpenAI(_ context.Context, _ string, originalRequestR
if hasFunctionCall {
template, _ = sjson.Set(template, "choices.0.finish_reason", "tool_calls")
template, _ = sjson.Set(template, "choices.0.native_finish_reason", "tool_calls")
} else if finishReason != "" {
// Only pass through specific finish reasons
if finishReason == "max_tokens" || finishReason == "stop" {
template, _ = sjson.Set(template, "choices.0.finish_reason", finishReason)
template, _ = sjson.Set(template, "choices.0.native_finish_reason", finishReason)
}
}
responseStrings = append(responseStrings, template)