feat: 记录流模式首字时间 (close #323)

relay/channel/openai/relay-openai.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"one-api/common"
 	"one-api/dto"
+	relaycommon "one-api/relay/common"
 	relayconstant "one-api/relay/constant"
 	"one-api/service"
 	"strings"
@@ -16,7 +17,7 @@ import (
 	"time"
 )
 
-func OpenaiStreamHandler(c *gin.Context, resp *http.Response, relayMode int) (*dto.OpenAIErrorWithStatusCode, string, int) {
+func OpenaiStreamHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo) (*dto.OpenAIErrorWithStatusCode, string, int) {
 	//checkSensitive := constant.ShouldCheckCompletionSensitive()
 	var responseTextBuilder strings.Builder
 	toolCount := 0
@@ -57,7 +58,7 @@ func OpenaiStreamHandler(c *gin.Context, resp *http.Response, relayMode int) (*d
 			}
 		}
 		streamResp := "[" + strings.Join(streamItems, ",") + "]"
-		switch relayMode {
+		switch info.RelayMode {
 		case relayconstant.RelayModeChatCompletions:
 			var streamResponses []dto.ChatCompletionsStreamResponseSimple
 			err := json.Unmarshal(common.StringToByteSlice(streamResp), &streamResponses)
@@ -126,9 +127,14 @@ func OpenaiStreamHandler(c *gin.Context, resp *http.Response, relayMode int) (*d
 		common.SafeSendBool(stopChan, true)
 	}()
 	service.SetEventStreamHeaders(c)
+	isFirst := true
 	c.Stream(func(w io.Writer) bool {
 		select {
 		case data := <-dataChan:
+			if isFirst {
+				isFirst = false
+				info.FirstResponseTime = time.Now()
+			}
 			if strings.HasPrefix(data, "data: [DONE]") {
 				data = data[:12]
 			}