feat: implement OpenAI responses handling and streaming support with built-in tool tracking

relay/common/relay_info.go

@@ -36,6 +36,7 @@ type ClaudeConvertInfo struct {
 const (
 	RelayFormatOpenAI = "openai"
 	RelayFormatClaude = "claude"
+	RelayFormatGemini = "gemini"
 )
 
 type RerankerInfo struct {
@@ -43,6 +44,16 @@ type RerankerInfo struct {
 	ReturnDocuments bool
 }
 
+type BuildInToolInfo struct {
+	ToolName          string
+	CallCount         int
+	SearchContextSize string
+}
+
+type ResponsesUsageInfo struct {
+	BuiltInTools map[string]*BuildInToolInfo
+}
+
 type RelayInfo struct {
 	ChannelType       int
 	ChannelId         int
@@ -90,6 +101,7 @@ type RelayInfo struct {
 	ThinkingContentInfo
 	*ClaudeConvertInfo
 	*RerankerInfo
+	*ResponsesUsageInfo
 }
 
 // 定义支持流式选项的通道类型
@@ -134,6 +146,31 @@ func GenRelayInfoRerank(c *gin.Context, req *dto.RerankRequest) *RelayInfo {
 	return info
 }
 
+func GenRelayInfoResponses(c *gin.Context, req *dto.OpenAIResponsesRequest) *RelayInfo {
+	info := GenRelayInfo(c)
+	info.RelayMode = relayconstant.RelayModeResponses
+	info.ResponsesUsageInfo = &ResponsesUsageInfo{
+		BuiltInTools: make(map[string]*BuildInToolInfo),
+	}
+	if len(req.Tools) > 0 {
+		for _, tool := range req.Tools {
+			info.ResponsesUsageInfo.BuiltInTools[tool.Type] = &BuildInToolInfo{
+				ToolName:  tool.Type,
+				CallCount: 0,
+			}
+			switch tool.Type {
+			case dto.BuildInToolWebSearchPreview:
+				if tool.SearchContextSize == "" {
+					tool.SearchContextSize = "medium"
+				}
+				info.ResponsesUsageInfo.BuiltInTools[tool.Type].SearchContextSize = tool.SearchContextSize
+			}
+		}
+	}
+	info.IsStream = req.Stream
+	return info
+}
+
 func GenRelayInfo(c *gin.Context) *RelayInfo {
 	channelType := c.GetInt("channel_type")
 	channelId := c.GetInt("channel_id")