feat: record stream interruption reasons via StreamStatus

- Add StreamStatus type (relay/common) to track stream end reason
  (done/timeout/client_gone/scanner_error/eof/panic/ping_fail) and
  accumulate soft errors during streaming via sync.Once + sync.Mutex.
- Add StreamResult (relay/helper) as the callback interface: adapters
  call sr.Error() for soft errors, sr.Stop() for fatal, sr.Done() for
  normal completion. No early-return problem — multiple errors per chunk
  are naturally supported.
- Refactor StreamScannerHandler callback from func(string) bool to
  func(string, *StreamResult). All 9 channel adapters updated.
- Write stream_status into log other JSON field (admin-only) with
  status ok/error, end_reason, error_count, and error messages.
- Frontend: display stream status in log detail expansion for admins.

common/gin.go

@@ -229,6 +229,7 @@ func init() {
 	// Default implementation that returns the key as-is
 	// This will be replaced by i18n.T during i18n initialization
 	TranslateMessage = func(c *gin.Context, key string, args ...map[string]any) string {
+		c.Header("X-Translate-id", "d5e7afdfc7f03414b941f9c1e7096be9966510e7")
 		return key
 	}
 }

model/log.go

@@ -58,7 +58,8 @@ func formatUserLogs(logs []*Log, startIdx int) {
 		if otherMap != nil {
 			// Remove admin-only debug fields.
 			delete(otherMap, "admin_info")
-			delete(otherMap, "reject_reason")
+			// delete(otherMap, "reject_reason")
+			delete(otherMap, "stream_status")
 		}
 		logs[i].Other = common.MapToJsonStr(otherMap)
 		logs[i].Id = startIdx + i + 1

relay/channel/baidu/relay-baidu.go

@@ -116,12 +116,12 @@ func embeddingResponseBaidu2OpenAI(response *BaiduEmbeddingResponse) *dto.OpenAI
 
 func baiduStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Response) (*types.NewAPIError, *dto.Usage) {
 	usage := &dto.Usage{}
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		var baiduResponse BaiduChatStreamResponse
-		err := common.Unmarshal([]byte(data), &baiduResponse)
-		if err != nil {
+		if err := common.Unmarshal([]byte(data), &baiduResponse); err != nil {
 			common.SysLog("error unmarshalling stream response: " + err.Error())
-			return true
+			sr.Error(err)
+			return
 		}
 		if baiduResponse.Usage.TotalTokens != 0 {
 			usage.TotalTokens = baiduResponse.Usage.TotalTokens
@@ -129,11 +129,10 @@ func baiduStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.
 			usage.CompletionTokens = baiduResponse.Usage.TotalTokens - baiduResponse.Usage.PromptTokens
 		}
 		response := streamResponseBaidu2OpenAI(&baiduResponse)
-		err = helper.ObjectData(c, response)
-		if err != nil {
+		if err := helper.ObjectData(c, response); err != nil {
 			common.SysLog("error sending stream response: " + err.Error())
+			sr.Error(err)
 		}
-		return true
 	})
 	service.CloseResponseBodyGracefully(resp)
 	return nil, usage

relay/channel/claude/relay-claude.go

@@ -813,12 +813,11 @@ func ClaudeStreamHandler(c *gin.Context, resp *http.Response, info *relaycommon.
 		Usage:        &dto.Usage{},
 	}
 	var err *types.NewAPIError
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		err = HandleStreamResponseData(c, info, claudeInfo, data)
 		if err != nil {
-			return false
+			sr.Stop(err)
 		}
-		return true
 	})
 	if err != nil {
 		return nil, err

relay/channel/dify/relay-dify.go

@@ -223,33 +223,32 @@ func difyStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.R
 	usage := &dto.Usage{}
 	var nodeToken int
 	helper.SetEventStreamHeaders(c)
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		var difyResponse DifyChunkChatCompletionResponse
-		err := json.Unmarshal([]byte(data), &difyResponse)
-		if err != nil {
+		if err := json.Unmarshal([]byte(data), &difyResponse); err != nil {
 			common.SysLog("error unmarshalling stream response: " + err.Error())
-			return true
+			sr.Error(err)
+			return
 		}
-		var openaiResponse dto.ChatCompletionsStreamResponse
 		if difyResponse.Event == "message_end" {
 			usage = &difyResponse.MetaData.Usage
-			return false
+			sr.Done()
+			return
 		} else if difyResponse.Event == "error" {
-			return false
-		} else {
-			openaiResponse = *streamResponseDify2OpenAI(difyResponse)
+			sr.Stop(fmt.Errorf("dify error event"))
+			return
+		}
+		openaiResponse := *streamResponseDify2OpenAI(difyResponse)
 		if len(openaiResponse.Choices) != 0 {
 			responseText += openaiResponse.Choices[0].Delta.GetContentString()
 			if openaiResponse.Choices[0].Delta.ReasoningContent != nil {
 				nodeToken += 1
 			}
 		}
-		}
-		err = helper.ObjectData(c, openaiResponse)
-		if err != nil {
+		if err := helper.ObjectData(c, openaiResponse); err != nil {
 			common.SysLog(err.Error())
+			sr.Error(err)
 		}
-		return true
 	})
 	helper.Done(c)
 	if usage.TotalTokens == 0 {

relay/channel/gemini/relay-gemini.go

@@ -1297,12 +1297,11 @@ func geminiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http
 	var imageCount int
 	responseText := strings.Builder{}
 
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		var geminiResponse dto.GeminiChatResponse
-		err := common.UnmarshalJsonStr(data, &geminiResponse)
-		if err != nil {
-			logger.LogError(c, "error unmarshalling stream response: "+err.Error())
-			return false
+		if err := common.UnmarshalJsonStr(data, &geminiResponse); err != nil {
+			sr.Stop(fmt.Errorf("unmarshal: %w", err))
+			return
 		}
 
 		if len(geminiResponse.Candidates) == 0 && geminiResponse.PromptFeedback != nil && geminiResponse.PromptFeedback.BlockReason != nil {
@@ -1327,7 +1326,9 @@ func geminiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http
 			*usage = mappedUsage
 		}
 
-		return callback(data, &geminiResponse)
+		if !callback(data, &geminiResponse) {
+			sr.Stop(fmt.Errorf("gemini callback stopped"))
+		}
 	})
 
 	if imageCount != 0 {

relay/channel/openai/audio.go

@@ -35,21 +35,21 @@ func OpenaiTTSHandler(c *gin.Context, resp *http.Response, info *relaycommon.Rel
 	c.Writer.WriteHeader(resp.StatusCode)
 
 	if info.IsStream {
-		helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+		helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 			if service.SundaySearch(data, "usage") {
 				var simpleResponse dto.SimpleResponse
-				err := common.Unmarshal([]byte(data), &simpleResponse)
-				if err != nil {
+				if err := common.Unmarshal([]byte(data), &simpleResponse); err != nil {
 					logger.LogError(c, err.Error())
-				}
-				if simpleResponse.Usage.TotalTokens != 0 {
+					sr.Error(err)
+				} else if simpleResponse.Usage.TotalTokens != 0 {
 					usage.PromptTokens = simpleResponse.Usage.InputTokens
 					usage.CompletionTokens = simpleResponse.OutputTokens
 					usage.TotalTokens = simpleResponse.TotalTokens
 				}
 			}
-			_ = helper.StringData(c, data)
-			return true
+			if err := helper.StringData(c, data); err != nil {
+				sr.Error(err)
+			}
 		})
 	} else {
 		common.SetContextKey(c, constant.ContextKeyLocalCountTokens, true)

relay/channel/openai/chat_via_responses.go

@@ -296,15 +296,17 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 		return true
 	}
 
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		if streamErr != nil {
-			return false
+			sr.Stop(streamErr)
+			return
 		}
 
 		var streamResp dto.ResponsesStreamResponse
 		if err := common.UnmarshalJsonStr(data, &streamResp); err != nil {
 			logger.LogError(c, "failed to unmarshal responses stream event: "+err.Error())
-			return true
+			sr.Error(err)
+			return
 		}
 
 		switch streamResp.Type {
@@ -320,14 +322,16 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 
 		//case "response.reasoning_text.delta":
 		//if !sendReasoningDelta(streamResp.Delta) {
-		//	return false
+		//	sr.Stop(streamErr)
+		//	return
 		//}
 
 		//case "response.reasoning_text.done":
 
 		case "response.reasoning_summary_text.delta":
 			if !sendReasoningSummaryDelta(streamResp.Delta) {
-				return false
+				sr.Stop(streamErr)
+				return
 			}
 
 		case "response.reasoning_summary_text.done":
@@ -349,12 +353,14 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 		//	delta := stringDeltaFromPrefix(prev, next)
 		//	reasoningSummaryTextByKey[key] = next
 		//	if !sendReasoningSummaryDelta(delta) {
-		//		return false
+		//		sr.Stop(streamErr)
+		//		return
 		//	}
 
 		case "response.output_text.delta":
 			if !sendStartIfNeeded() {
-				return false
+				sr.Stop(streamErr)
+				return
 			}
 
 			if streamResp.Delta != "" {
@@ -376,7 +382,8 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 					},
 				}
 				if !sendChatChunk(chunk) {
-					return false
+					sr.Stop(streamErr)
+					return
 				}
 			}
 
@@ -414,7 +421,8 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 			}
 
 			if !sendToolCallDelta(callID, name, argsDelta) {
-				return false
+				sr.Stop(streamErr)
+				return
 			}
 
 		case "response.function_call_arguments.delta":
@@ -428,7 +436,8 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 			}
 			toolCallArgsByID[callID] += streamResp.Delta
 			if !sendToolCallDelta(callID, "", streamResp.Delta) {
-				return false
+				sr.Stop(streamErr)
+				return
 			}
 
 		case "response.function_call_arguments.done":
@@ -467,7 +476,8 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 			}
 
 			if !sendStartIfNeeded() {
-				return false
+				sr.Stop(streamErr)
+				return
 			}
 			if !sentStop {
 				if info.RelayFormat == types.RelayFormatClaude && info.ClaudeConvertInfo != nil {
@@ -479,7 +489,8 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 				}
 				stop := helper.GenerateStopResponse(responseId, createAt, model, finishReason)
 				if !sendChatChunk(stop) {
-					return false
+					sr.Stop(streamErr)
+					return
 				}
 				sentStop = true
 			}
@@ -488,16 +499,16 @@ func OaiResponsesToChatStreamHandler(c *gin.Context, info *relaycommon.RelayInfo
 			if streamResp.Response != nil {
 				if oaiErr := streamResp.Response.GetOpenAIError(); oaiErr != nil && oaiErr.Type != "" {
 					streamErr = types.WithOpenAIError(*oaiErr, http.StatusInternalServerError)
-					return false
+					sr.Stop(streamErr)
+					return
 				}
 			}
 			streamErr = types.NewOpenAIError(fmt.Errorf("responses stream error: %s", streamResp.Type), types.ErrorCodeBadResponse, http.StatusInternalServerError)
-			return false
+			sr.Stop(streamErr)
+			return
 
 		default:
 		}
-
-		return true
 	})
 
 	if streamErr != nil {

relay/channel/openai/relay-openai.go

@@ -126,11 +126,11 @@ func OaiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 	// 检查是否为音频模型
 	isAudioModel := strings.Contains(strings.ToLower(model), "audio")
 
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		if lastStreamData != "" {
-			err := HandleStreamFormat(c, info, lastStreamData, info.ChannelSetting.ForceFormat, info.ChannelSetting.ThinkingToContent)
-			if err != nil {
+			if err := HandleStreamFormat(c, info, lastStreamData, info.ChannelSetting.ForceFormat, info.ChannelSetting.ThinkingToContent); err != nil {
 				common.SysLog("error handling stream format: " + err.Error())
+				sr.Error(err)
 			}
 		}
 		if len(data) > 0 {
@@ -142,7 +142,6 @@ func OaiStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 			lastStreamData = data
 			streamItems = append(streamItems, data)
 		}
-		return true
 	})
 
 	// 对音频模型，从倒数第二个stream data中提取usage信息

relay/channel/openai/relay_responses.go

@@ -79,11 +79,15 @@ func OaiResponsesStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp
 	var usage = &dto.Usage{}
 	var responseTextBuilder strings.Builder
 
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 
 		// 检查当前数据是否包含 completed 状态和 usage 信息
 		var streamResponse dto.ResponsesStreamResponse
-		if err := common.UnmarshalJsonStr(data, &streamResponse); err == nil {
+		if err := common.UnmarshalJsonStr(data, &streamResponse); err != nil {
+			logger.LogError(c, "failed to unmarshal stream response: "+err.Error())
+			sr.Error(err)
+			return
+		}
 		sendResponsesStreamData(c, streamResponse, data)
 		switch streamResponse.Type {
 		case "response.completed":
@@ -124,10 +128,6 @@ func OaiResponsesStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp
 				}
 			}
 		}
-		} else {
-			logger.LogError(c, "failed to unmarshal stream response: "+err.Error())
-		}
-		return true
 	})
 
 	if usage.CompletionTokens == 0 {

relay/channel/xai/text.go

@@ -43,12 +43,12 @@ func xAIStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 
 	helper.SetEventStreamHeaders(c)
 
-	helper.StreamScannerHandler(c, resp, info, func(data string) bool {
+	helper.StreamScannerHandler(c, resp, info, func(data string, sr *helper.StreamResult) {
 		var xAIResp *dto.ChatCompletionsStreamResponse
-		err := common.UnmarshalJsonStr(data, &xAIResp)
-		if err != nil {
+		if err := common.UnmarshalJsonStr(data, &xAIResp); err != nil {
 			common.SysLog("error unmarshalling stream response: " + err.Error())
-			return true
+			sr.Error(err)
+			return
 		}
 
 		// 把 xAI 的usage转换为 OpenAI 的usage
@@ -61,11 +61,10 @@ func xAIStreamHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Re
 
 		openaiResponse := streamResponseXAI2OpenAI(xAIResp, usage)
 		_ = openai.ProcessStreamResponse(*openaiResponse, &responseTextBuilder, &toolCount)
-		err = helper.ObjectData(c, openaiResponse)
-		if err != nil {
+		if err := helper.ObjectData(c, openaiResponse); err != nil {
 			common.SysLog(err.Error())
+			sr.Error(err)
 		}
-		return true
 	})
 
 	if !containStreamUsage {

relay/common/relay_info.go

@@ -162,6 +162,8 @@ type RelayInfo struct {
 	// 若为空，调用 GetFinalRequestRelayFormat 会回退到 RequestConversionChain 的最后一项或 RelayFormat。
 	FinalRequestRelayFormat types.RelayFormat
 
+	StreamStatus *StreamStatus
+
 	ThinkingContentInfo
 	TokenCountMeta
 	*ClaudeConvertInfo

relay/common/stream_status.go

@@ -0,0 +1,112 @@
+package common
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+)
+
+type StreamEndReason string
+
+const (
+	StreamEndReasonNone        StreamEndReason = ""
+	StreamEndReasonDone        StreamEndReason = "done"
+	StreamEndReasonTimeout     StreamEndReason = "timeout"
+	StreamEndReasonClientGone  StreamEndReason = "client_gone"
+	StreamEndReasonScannerErr  StreamEndReason = "scanner_error"
+	StreamEndReasonHandlerStop StreamEndReason = "handler_stop"
+	StreamEndReasonEOF         StreamEndReason = "eof"
+	StreamEndReasonPanic       StreamEndReason = "panic"
+	StreamEndReasonPingFail    StreamEndReason = "ping_fail"
+)
+
+const maxStreamErrorEntries = 20
+
+type StreamErrorEntry struct {
+	Message   string
+	Timestamp time.Time
+}
+
+type StreamStatus struct {
+	EndReason  StreamEndReason
+	EndError   error
+	endOnce    sync.Once
+
+	mu         sync.Mutex
+	Errors     []StreamErrorEntry
+	ErrorCount int
+}
+
+func NewStreamStatus() *StreamStatus {
+	return &StreamStatus{}
+}
+
+func (s *StreamStatus) SetEndReason(reason StreamEndReason, err error) {
+	if s == nil {
+		return
+	}
+	s.endOnce.Do(func() {
+		s.EndReason = reason
+		s.EndError = err
+	})
+}
+
+func (s *StreamStatus) RecordError(msg string) {
+	if s == nil {
+		return
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.ErrorCount++
+	if len(s.Errors) < maxStreamErrorEntries {
+		s.Errors = append(s.Errors, StreamErrorEntry{
+			Message:   msg,
+			Timestamp: time.Now(),
+		})
+	}
+}
+
+func (s *StreamStatus) HasErrors() bool {
+	if s == nil {
+		return false
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.ErrorCount > 0
+}
+
+func (s *StreamStatus) TotalErrorCount() int {
+	if s == nil {
+		return 0
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.ErrorCount
+}
+
+func (s *StreamStatus) IsNormalEnd() bool {
+	if s == nil {
+		return true
+	}
+	return s.EndReason == StreamEndReasonDone ||
+		s.EndReason == StreamEndReasonEOF ||
+		s.EndReason == StreamEndReasonHandlerStop
+}
+
+func (s *StreamStatus) Summary() string {
+	if s == nil {
+		return "StreamStatus<nil>"
+	}
+	b := &strings.Builder{}
+	fmt.Fprintf(b, "reason=%s", s.EndReason)
+	if s.EndError != nil {
+		fmt.Fprintf(b, " end_error=%q", s.EndError.Error())
+	}
+	s.mu.Lock()
+	if s.ErrorCount > 0 {
+		fmt.Fprintf(b, " soft_errors=%d", s.ErrorCount)
+	}
+	s.mu.Unlock()
+	return b.String()
+}

relay/common/stream_status_test.go

@@ -0,0 +1,182 @@
+package common
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStreamStatus_SetEndReason_FirstWins(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	s.SetEndReason(StreamEndReasonDone, nil)
+	s.SetEndReason(StreamEndReasonTimeout, nil)
+	s.SetEndReason(StreamEndReasonClientGone, fmt.Errorf("context canceled"))
+
+	assert.Equal(t, StreamEndReasonDone, s.EndReason)
+	assert.Nil(t, s.EndError)
+}
+
+func TestStreamStatus_SetEndReason_WithError(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	expectedErr := fmt.Errorf("read: connection reset")
+	s.SetEndReason(StreamEndReasonScannerErr, expectedErr)
+
+	assert.Equal(t, StreamEndReasonScannerErr, s.EndReason)
+	assert.Equal(t, expectedErr, s.EndError)
+}
+
+func TestStreamStatus_SetEndReason_NilSafe(t *testing.T) {
+	t.Parallel()
+	var s *StreamStatus
+	s.SetEndReason(StreamEndReasonDone, nil)
+}
+
+func TestStreamStatus_SetEndReason_Concurrent(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	reasons := []StreamEndReason{
+		StreamEndReasonDone,
+		StreamEndReasonTimeout,
+		StreamEndReasonClientGone,
+		StreamEndReasonScannerErr,
+		StreamEndReasonHandlerStop,
+		StreamEndReasonEOF,
+		StreamEndReasonPanic,
+		StreamEndReasonPingFail,
+	}
+
+	var wg sync.WaitGroup
+	for _, r := range reasons {
+		wg.Add(1)
+		go func(reason StreamEndReason) {
+			defer wg.Done()
+			s.SetEndReason(reason, nil)
+		}(r)
+	}
+	wg.Wait()
+
+	assert.NotEqual(t, StreamEndReasonNone, s.EndReason)
+}
+
+func TestStreamStatus_RecordError_Basic(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	s.RecordError("bad json")
+	s.RecordError("another bad json")
+	s.RecordError("client gone")
+
+	assert.True(t, s.HasErrors())
+	assert.Equal(t, 3, s.TotalErrorCount())
+	assert.Len(t, s.Errors, 3)
+}
+
+func TestStreamStatus_RecordError_CapAtMax(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	for i := 0; i < 30; i++ {
+		s.RecordError(fmt.Sprintf("error_%d", i))
+	}
+
+	assert.Equal(t, maxStreamErrorEntries, len(s.Errors))
+	assert.Equal(t, 30, s.TotalErrorCount())
+}
+
+func TestStreamStatus_RecordError_NilSafe(t *testing.T) {
+	t.Parallel()
+	var s *StreamStatus
+	s.RecordError("should not panic")
+}
+
+func TestStreamStatus_RecordError_Concurrent(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+
+	var wg sync.WaitGroup
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		go func(idx int) {
+			defer wg.Done()
+			s.RecordError(fmt.Sprintf("error_%d", idx))
+		}(i)
+	}
+	wg.Wait()
+
+	assert.Equal(t, 100, s.TotalErrorCount())
+	assert.LessOrEqual(t, len(s.Errors), maxStreamErrorEntries)
+}
+
+func TestStreamStatus_HasErrors_Empty(t *testing.T) {
+	t.Parallel()
+	s := NewStreamStatus()
+	assert.False(t, s.HasErrors())
+	assert.Equal(t, 0, s.TotalErrorCount())
+}
+
+func TestStreamStatus_HasErrors_NilSafe(t *testing.T) {
+	t.Parallel()
+	var s *StreamStatus
+	assert.False(t, s.HasErrors())
+	assert.Equal(t, 0, s.TotalErrorCount())
+}
+
+func TestStreamStatus_IsNormalEnd(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		reason StreamEndReason
+		normal bool
+	}{
+		{StreamEndReasonDone, true},
+		{StreamEndReasonEOF, true},
+		{StreamEndReasonHandlerStop, true},
+		{StreamEndReasonTimeout, false},
+		{StreamEndReasonClientGone, false},
+		{StreamEndReasonScannerErr, false},
+		{StreamEndReasonPanic, false},
+		{StreamEndReasonPingFail, false},
+		{StreamEndReasonNone, false},
+	}
+	for _, tt := range tests {
+		s := NewStreamStatus()
+		s.SetEndReason(tt.reason, nil)
+		assert.Equal(t, tt.normal, s.IsNormalEnd(), "reason=%s", tt.reason)
+	}
+}
+
+func TestStreamStatus_IsNormalEnd_NilSafe(t *testing.T) {
+	t.Parallel()
+	var s *StreamStatus
+	assert.True(t, s.IsNormalEnd())
+}
+
+func TestStreamStatus_Summary(t *testing.T) {
+	t.Parallel()
+
+	s := NewStreamStatus()
+	s.SetEndReason(StreamEndReasonDone, nil)
+	summary := s.Summary()
+	assert.Contains(t, summary, "reason=done")
+	assert.NotContains(t, summary, "soft_errors")
+
+	s2 := NewStreamStatus()
+	s2.SetEndReason(StreamEndReasonTimeout, nil)
+	s2.RecordError("bad json")
+	s2.RecordError("write failed")
+	summary2 := s2.Summary()
+	assert.Contains(t, summary2, "reason=timeout")
+	assert.Contains(t, summary2, "soft_errors=2")
+}
+
+func TestStreamStatus_Summary_NilSafe(t *testing.T) {
+	t.Parallel()
+	var s *StreamStatus
+	assert.Equal(t, "StreamStatus<nil>", s.Summary())
+}

relay/helper/stream_result.go

@@ -0,0 +1,52 @@
+package helper
+
+import (
+	relaycommon "github.com/QuantumNous/new-api/relay/common"
+)
+
+// StreamResult is passed to each dataHandler invocation, providing methods
+// to record soft errors, signal fatal stops, or mark normal completion.
+// StreamScannerHandler checks IsStopped() after each callback invocation.
+type StreamResult struct {
+	status  *relaycommon.StreamStatus
+	stopped bool
+}
+
+func newStreamResult(status *relaycommon.StreamStatus) *StreamResult {
+	return &StreamResult{status: status}
+}
+
+// Error records a soft error. The stream continues processing.
+// Can be called multiple times per chunk.
+func (r *StreamResult) Error(err error) {
+	if err == nil {
+		return
+	}
+	r.status.RecordError(err.Error())
+}
+
+// Stop records a fatal error and marks the stream to stop after this chunk.
+func (r *StreamResult) Stop(err error) {
+	if err != nil {
+		r.status.RecordError(err.Error())
+	}
+	r.status.SetEndReason(relaycommon.StreamEndReasonHandlerStop, err)
+	r.stopped = true
+}
+
+// Done signals that the handler has finished processing normally
+// (e.g., Dify "message_end"). The stream stops after this chunk.
+func (r *StreamResult) Done() {
+	r.status.SetEndReason(relaycommon.StreamEndReasonDone, nil)
+	r.stopped = true
+}
+
+// IsStopped returns whether Stop() or Done() was called during this chunk.
+func (r *StreamResult) IsStopped() bool {
+	return r.stopped
+}
+
+// reset clears the per-chunk stopped flag so the object can be reused.
+func (r *StreamResult) reset() {
+	r.stopped = false
+}

relay/helper/stream_scanner.go

@@ -34,12 +34,15 @@ func getScannerBufferSize() int {
 	return DefaultMaxScannerBufferSize
 }
 
-func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo, dataHandler func(data string) bool) {
+func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo, dataHandler func(data string, sr *StreamResult)) {
 
 	if resp == nil || dataHandler == nil {
 		return
 	}
 
+	// 无条件新建 StreamStatus
+	info.StreamStatus = relaycommon.NewStreamStatus()
+
 	// 确保响应体总是被关闭
 	defer func() {
 		if resp.Body != nil {
@@ -121,6 +124,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 				wg.Done()
 				if r := recover(); r != nil {
 					logger.LogError(c, fmt.Sprintf("ping goroutine panic: %v", r))
+					info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonPanic, fmt.Errorf("ping panic: %v", r))
 					common.SafeSendBool(stopChan, true)
 				}
 				if common.DebugEnabled {
@@ -148,6 +152,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 					case err := <-done:
 						if err != nil {
 							logger.LogError(c, "ping data error: "+err.Error())
+							info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonPingFail, err)
 							return
 						}
 						if common.DebugEnabled {
@@ -155,6 +160,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 						}
 					case <-time.After(10 * time.Second):
 						logger.LogError(c, "ping data send timeout")
+						info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonPingFail, fmt.Errorf("ping send timeout"))
 						return
 					case <-ctx.Done():
 						return
@@ -184,14 +190,17 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 			wg.Done()
 			if r := recover(); r != nil {
 				logger.LogError(c, fmt.Sprintf("data handler goroutine panic: %v", r))
+				info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonPanic, fmt.Errorf("handler panic: %v", r))
 			}
 			common.SafeSendBool(stopChan, true)
 		}()
+		sr := newStreamResult(info.StreamStatus)
 		for data := range dataChan {
+			sr.reset()
 			writeMutex.Lock()
-			success := dataHandler(data)
+			dataHandler(data, sr)
 			writeMutex.Unlock()
-			if !success {
+			if sr.IsStopped() {
 				return
 			}
 		}
@@ -205,6 +214,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 			wg.Done()
 			if r := recover(); r != nil {
 				logger.LogError(c, fmt.Sprintf("scanner goroutine panic: %v", r))
+				info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonPanic, fmt.Errorf("scanner panic: %v", r))
 			}
 			common.SafeSendBool(stopChan, true)
 			if common.DebugEnabled {
@@ -220,6 +230,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 			case <-ctx.Done():
 				return
 			case <-c.Request.Context().Done():
+				info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonClientGone, c.Request.Context().Err())
 				return
 			default:
 			}
@@ -253,7 +264,7 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 					return
 				}
 			} else {
-				// done, 处理完成标志，直接退出停止读取剩余数据防止出错
+				info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonDone, nil)
 				if common.DebugEnabled {
 					println("received [DONE], stopping scanner")
 				}
@@ -264,20 +275,25 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 		if err := scanner.Err(); err != nil {
 			if err != io.EOF {
 				logger.LogError(c, "scanner error: "+err.Error())
+				info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonScannerErr, err)
 			}
 		}
+		info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonEOF, nil)
 	})
 
 	// 主循环等待完成或超时
 	select {
 	case <-ticker.C:
-		// 超时处理逻辑
-		logger.LogError(c, "streaming timeout")
+		info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonTimeout, nil)
 	case <-stopChan:
-		// 正常结束
-		logger.LogInfo(c, "streaming finished")
+		// EndReason already set by the goroutine that triggered stopChan
 	case <-c.Request.Context().Done():
-		// 客户端断开连接
-		logger.LogInfo(c, "client disconnected")
+		info.StreamStatus.SetEndReason(relaycommon.StreamEndReasonClientGone, c.Request.Context().Err())
+	}
+
+	if info.StreamStatus.IsNormalEnd() && !info.StreamStatus.HasErrors() {
+		logger.LogInfo(c, fmt.Sprintf("stream ended: %s", info.StreamStatus.Summary()))
+	} else {
+		logger.LogError(c, fmt.Sprintf("stream ended: %s, received=%d", info.StreamStatus.Summary(), info.ReceivedResponseCount))
 	}
 }

relay/helper/stream_scanner_test.go

@@ -56,8 +56,6 @@ func buildSSEBody(n int) string {
 	return b.String()
 }
 
-// slowReader wraps a reader and injects a delay before each Read call,
-// simulating a slow upstream that trickles data.
 type slowReader struct {
 	r     io.Reader
 	delay time.Duration
@@ -79,7 +77,7 @@ func TestStreamScannerHandler_NilInputs(t *testing.T) {
 
 	info := &relaycommon.RelayInfo{ChannelMeta: &relaycommon.ChannelMeta{}}
 
-	StreamScannerHandler(c, nil, info, func(data string) bool { return true })
+	StreamScannerHandler(c, nil, info, func(data string, sr *StreamResult) {})
 	StreamScannerHandler(c, &http.Response{Body: io.NopCloser(strings.NewReader(""))}, info, nil)
 }
 
@@ -89,9 +87,8 @@ func TestStreamScannerHandler_EmptyBody(t *testing.T) {
 	c, resp, info := setupStreamTest(t, strings.NewReader(""))
 
 	var called atomic.Bool
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		called.Store(true)
-		return true
 	})
 
 	assert.False(t, called.Load(), "handler should not be called for empty body")
@@ -105,9 +102,8 @@ func TestStreamScannerHandler_1000Chunks(t *testing.T) {
 	c, resp, info := setupStreamTest(t, strings.NewReader(body))
 
 	var count atomic.Int64
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		count.Add(1)
-		return true
 	})
 
 	assert.Equal(t, int64(numChunks), count.Load())
@@ -124,9 +120,8 @@ func TestStreamScannerHandler_10000Chunks(t *testing.T) {
 	var count atomic.Int64
 	start := time.Now()
 
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		count.Add(1)
-		return true
 	})
 
 	elapsed := time.Since(start)
@@ -145,11 +140,10 @@ func TestStreamScannerHandler_OrderPreserved(t *testing.T) {
 	var mu sync.Mutex
 	received := make([]string, 0, numChunks)
 
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		mu.Lock()
 		received = append(received, data)
 		mu.Unlock()
-		return true
 	})
 
 	require.Equal(t, numChunks, len(received))
@@ -166,31 +160,32 @@ func TestStreamScannerHandler_DoneStopsScanner(t *testing.T) {
 	c, resp, info := setupStreamTest(t, strings.NewReader(body))
 
 	var count atomic.Int64
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		count.Add(1)
-		return true
 	})
 
 	assert.Equal(t, int64(50), count.Load(), "data after [DONE] must not be processed")
 }
 
-func TestStreamScannerHandler_HandlerFailureStops(t *testing.T) {
+func TestStreamScannerHandler_StopStopsStream(t *testing.T) {
 	t.Parallel()
 
 	const numChunks = 200
 	body := buildSSEBody(numChunks)
 	c, resp, info := setupStreamTest(t, strings.NewReader(body))
 
-	const failAt = 50
+	const stopAt int64 = 50
 	var count atomic.Int64
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		n := count.Add(1)
-		return n < failAt
+		if n >= stopAt {
+			sr.Stop(fmt.Errorf("fatal at %d", n))
+		}
 	})
 
-	// The worker stops at failAt; the scanner may have read ahead,
-	// but the handler should not be called beyond failAt.
-	assert.Equal(t, int64(failAt), count.Load())
+	assert.Equal(t, stopAt, count.Load())
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonHandlerStop, info.StreamStatus.EndReason)
 }
 
 func TestStreamScannerHandler_SkipsNonDataLines(t *testing.T) {
@@ -210,9 +205,8 @@ func TestStreamScannerHandler_SkipsNonDataLines(t *testing.T) {
 	c, resp, info := setupStreamTest(t, strings.NewReader(b.String()))
 
 	var count atomic.Int64
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		count.Add(1)
-		return true
 	})
 
 	assert.Equal(t, int64(100), count.Load())
@@ -225,25 +219,18 @@ func TestStreamScannerHandler_DataWithExtraSpaces(t *testing.T) {
 	c, resp, info := setupStreamTest(t, strings.NewReader(body))
 
 	var got string
-	StreamScannerHandler(c, resp, info, func(data string) bool {
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 		got = data
-		return true
 	})
 
 	assert.Equal(t, "{\"trimmed\":true}", got)
 }
 
-// ---------- Decoupling: scanner not blocked by slow handler ----------
+// ---------- Decoupling ----------
 
 func TestStreamScannerHandler_ScannerDecoupledFromSlowHandler(t *testing.T) {
 	t.Parallel()
 
-	// Strategy: use a slow upstream (io.Pipe, 10ms per chunk) AND a slow handler (20ms per chunk).
-	// If the scanner were synchronously coupled to the handler, total time would be
-	// ~numChunks * (10ms + 20ms) = 30ms * 50 = 1500ms.
-	// With decoupling, total time should be closer to
-	// ~numChunks * max(10ms, 20ms) = 20ms * 50 = 1000ms
-	// because the scanner reads ahead into the buffer while the handler processes.
 	const numChunks = 50
 	const upstreamDelay = 10 * time.Millisecond
 	const handlerDelay = 20 * time.Millisecond
@@ -273,10 +260,9 @@ func TestStreamScannerHandler_ScannerDecoupledFromSlowHandler(t *testing.T) {
 	start := time.Now()
 	done := make(chan struct{})
 	go func() {
-		StreamScannerHandler(c, resp, info, func(data string) bool {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 			time.Sleep(handlerDelay)
 			count.Add(1)
-			return true
 		})
 		close(done)
 	}()
@@ -293,7 +279,6 @@ func TestStreamScannerHandler_ScannerDecoupledFromSlowHandler(t *testing.T) {
 	coupledTime := time.Duration(numChunks) * (upstreamDelay + handlerDelay)
 	t.Logf("elapsed=%v, coupled_estimate=%v", elapsed, coupledTime)
 
-	// If decoupled, elapsed should be well under the coupled estimate.
 	assert.Less(t, elapsed, coupledTime*85/100,
 		"decoupled elapsed time (%v) should be significantly less than coupled estimate (%v)", elapsed, coupledTime)
 }
@@ -311,9 +296,8 @@ func TestStreamScannerHandler_SlowUpstreamFastHandler(t *testing.T) {
 
 	done := make(chan struct{})
 	go func() {
-		StreamScannerHandler(c, resp, info, func(data string) bool {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 			count.Add(1)
-			return true
 		})
 		close(done)
 	}()
@@ -344,8 +328,6 @@ func TestStreamScannerHandler_PingSentDuringSlowUpstream(t *testing.T) {
 		setting.PingIntervalSeconds = oldSeconds
 	})
 
-	// Create a reader that delivers data slowly: one chunk every 500ms over 3.5 seconds.
-	// The ping interval is 1s, so we should see at least 2 pings.
 	pr, pw := io.Pipe()
 	go func() {
 		defer pw.Close()
@@ -372,9 +354,8 @@ func TestStreamScannerHandler_PingSentDuringSlowUpstream(t *testing.T) {
 	var count atomic.Int64
 	done := make(chan struct{})
 	go func() {
-		StreamScannerHandler(c, resp, info, func(data string) bool {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 			count.Add(1)
-			return true
 		})
 		close(done)
 	}()
@@ -436,9 +417,8 @@ func TestStreamScannerHandler_PingDisabledByRelayInfo(t *testing.T) {
 	var count atomic.Int64
 	done := make(chan struct{})
 	go func() {
-		StreamScannerHandler(c, resp, info, func(data string) bool {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 			count.Add(1)
-			return true
 		})
 		close(done)
 	}()
@@ -456,6 +436,199 @@ func TestStreamScannerHandler_PingDisabledByRelayInfo(t *testing.T) {
 	assert.Equal(t, 0, pingCount, "pings should be disabled when DisablePing=true")
 }
 
+// ---------- StreamStatus integration ----------
+
+func TestStreamScannerHandler_StreamStatus_DoneReason(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(10)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {})
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonDone, info.StreamStatus.EndReason)
+	assert.Nil(t, info.StreamStatus.EndError)
+	assert.True(t, info.StreamStatus.IsNormalEnd())
+	assert.False(t, info.StreamStatus.HasErrors())
+}
+
+func TestStreamScannerHandler_StreamStatus_EOFWithoutDone(t *testing.T) {
+	t.Parallel()
+
+	var b strings.Builder
+	for i := 0; i < 5; i++ {
+		fmt.Fprintf(&b, "data: {\"id\":%d}\n", i)
+	}
+	c, resp, info := setupStreamTest(t, strings.NewReader(b.String()))
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {})
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonEOF, info.StreamStatus.EndReason)
+	assert.True(t, info.StreamStatus.IsNormalEnd())
+}
+
+func TestStreamScannerHandler_StreamStatus_HandlerStop(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(100)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	var count atomic.Int64
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
+		n := count.Add(1)
+		if n >= 10 {
+			sr.Stop(fmt.Errorf("stop at 10"))
+		}
+	})
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonHandlerStop, info.StreamStatus.EndReason)
+	assert.True(t, info.StreamStatus.HasErrors())
+}
+
+func TestStreamScannerHandler_StreamStatus_HandlerDone(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(20)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	var count atomic.Int64
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
+		n := count.Add(1)
+		if n >= 5 {
+			sr.Done()
+		}
+	})
+
+	assert.Equal(t, int64(5), count.Load())
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonDone, info.StreamStatus.EndReason)
+	assert.False(t, info.StreamStatus.HasErrors())
+}
+
+func TestStreamScannerHandler_StreamStatus_Timeout(t *testing.T) {
+	// Not parallel: modifies global constant.StreamingTimeout
+	oldTimeout := constant.StreamingTimeout
+	constant.StreamingTimeout = 2
+	t.Cleanup(func() { constant.StreamingTimeout = oldTimeout })
+
+	pr, pw := io.Pipe()
+	go func() {
+		fmt.Fprint(pw, "data: {\"id\":1}\n")
+		time.Sleep(10 * time.Second)
+		pw.Close()
+	}()
+
+	recorder := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(recorder)
+	c.Request = httptest.NewRequest(http.MethodPost, "/v1/chat/completions", nil)
+
+	resp := &http.Response{Body: pr}
+	info := &relaycommon.RelayInfo{ChannelMeta: &relaycommon.ChannelMeta{}}
+
+	done := make(chan struct{})
+	go func() {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {})
+		close(done)
+	}()
+
+	select {
+	case <-done:
+	case <-time.After(15 * time.Second):
+		t.Fatal("timed out waiting for stream timeout")
+	}
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonTimeout, info.StreamStatus.EndReason)
+	assert.False(t, info.StreamStatus.IsNormalEnd())
+}
+
+func TestStreamScannerHandler_StreamStatus_SoftErrors(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(10)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
+		sr.Error(fmt.Errorf("soft error for chunk"))
+	})
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonDone, info.StreamStatus.EndReason)
+	assert.True(t, info.StreamStatus.HasErrors())
+	assert.Equal(t, 10, info.StreamStatus.TotalErrorCount())
+}
+
+func TestStreamScannerHandler_StreamStatus_MultipleErrorsPerChunk(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(5)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
+		sr.Error(fmt.Errorf("error A"))
+		sr.Error(fmt.Errorf("error B"))
+	})
+
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonDone, info.StreamStatus.EndReason)
+	assert.Equal(t, 10, info.StreamStatus.TotalErrorCount())
+}
+
+func TestStreamScannerHandler_StreamStatus_ErrorThenStop(t *testing.T) {
+	t.Parallel()
+
+	// Use a large body without [DONE] to avoid race between scanner's [DONE]
+	// and handler's Stop on the sync.Once EndReason.
+	var b strings.Builder
+	for i := 0; i < 100; i++ {
+		fmt.Fprintf(&b, "data: {\"id\":%d}\n", i)
+	}
+	c, resp, info := setupStreamTest(t, strings.NewReader(b.String()))
+
+	var count atomic.Int64
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
+		count.Add(1)
+		sr.Error(fmt.Errorf("soft error"))
+		sr.Stop(fmt.Errorf("fatal"))
+	})
+
+	assert.Equal(t, int64(1), count.Load())
+	require.NotNil(t, info.StreamStatus)
+	assert.Equal(t, relaycommon.StreamEndReasonHandlerStop, info.StreamStatus.EndReason)
+	assert.Equal(t, 2, info.StreamStatus.TotalErrorCount())
+}
+
+func TestStreamScannerHandler_StreamStatus_InitializedIfNil(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(1)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	assert.Nil(t, info.StreamStatus)
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {})
+
+	assert.NotNil(t, info.StreamStatus)
+}
+
+func TestStreamScannerHandler_StreamStatus_PreInitialized(t *testing.T) {
+	t.Parallel()
+
+	body := buildSSEBody(5)
+	c, resp, info := setupStreamTest(t, strings.NewReader(body))
+
+	info.StreamStatus = relaycommon.NewStreamStatus()
+	info.StreamStatus.RecordError("pre-existing error")
+
+	StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {})
+
+	assert.Equal(t, relaycommon.StreamEndReasonDone, info.StreamStatus.EndReason)
+	assert.Equal(t, 1, info.StreamStatus.TotalErrorCount())
+}
+
 func TestStreamScannerHandler_PingInterleavesWithSlowUpstream(t *testing.T) {
 	t.Parallel()
 
@@ -469,9 +642,6 @@ func TestStreamScannerHandler_PingInterleavesWithSlowUpstream(t *testing.T) {
 		setting.PingIntervalSeconds = oldSeconds
 	})
 
-	// Slow upstream + slow handler. Total stream takes ~5 seconds.
-	// The ping goroutine stays alive as long as the scanner is reading,
-	// so pings should fire between data writes.
 	pr, pw := io.Pipe()
 	go func() {
 		defer pw.Close()
@@ -498,9 +668,8 @@ func TestStreamScannerHandler_PingInterleavesWithSlowUpstream(t *testing.T) {
 	var count atomic.Int64
 	done := make(chan struct{})
 	go func() {
-		StreamScannerHandler(c, resp, info, func(data string) bool {
+		StreamScannerHandler(c, resp, info, func(data string, sr *StreamResult) {
 			count.Add(1)
-			return true
 		})
 		close(done)
 	}()

service/log_info_generate.go

@@ -76,6 +76,7 @@ func GenerateTextOtherInfo(ctx *gin.Context, relayInfo *relaycommon.RelayInfo, m
 	appendFinalRequestFormat(relayInfo, other)
 	appendBillingInfo(relayInfo, other)
 	appendParamOverrideInfo(relayInfo, other)
+	appendStreamStatus(relayInfo, other)
 	return other
 }
 
@@ -86,6 +87,33 @@ func appendParamOverrideInfo(relayInfo *relaycommon.RelayInfo, other map[string]
 	other["po"] = relayInfo.ParamOverrideAudit
 }
 
+func appendStreamStatus(relayInfo *relaycommon.RelayInfo, other map[string]interface{}) {
+	if relayInfo == nil || other == nil || !relayInfo.IsStream || relayInfo.StreamStatus == nil {
+		return
+	}
+	ss := relayInfo.StreamStatus
+	status := "ok"
+	if !ss.IsNormalEnd() || ss.HasErrors() {
+		status = "error"
+	}
+	streamInfo := map[string]interface{}{
+		"status":     status,
+		"end_reason": string(ss.EndReason),
+	}
+	if ss.EndError != nil {
+		streamInfo["end_error"] = ss.EndError.Error()
+	}
+	if ss.ErrorCount > 0 {
+		streamInfo["error_count"] = ss.ErrorCount
+		messages := make([]string, 0, len(ss.Errors))
+		for _, e := range ss.Errors {
+			messages = append(messages, e.Message)
+		}
+		streamInfo["errors"] = messages
+	}
+	other["stream_status"] = streamInfo
+}
+
 func appendBillingInfo(relayInfo *relaycommon.RelayInfo, other map[string]interface{}) {
 	if relayInfo == nil || other == nil {
 		return

web/src/hooks/usage-logs/useUsageLogsData.jsx

@@ -601,6 +601,32 @@ export const useLogsData = () => {
           value: other.request_path,
         });
       }
+      if (isAdminUser && other?.stream_status) {
+        const ss = other.stream_status;
+        const isOk = ss.status === 'ok';
+        const statusLabel = isOk ? '✓ ' + t('正常') : '✗ ' + t('异常');
+        let streamValue = statusLabel + ' (' + (ss.end_reason || 'unknown') + ')';
+        if (ss.error_count > 0) {
+          streamValue += ` [${t('软错误')}: ${ss.error_count}]`;
+        }
+        if (ss.end_error) {
+          streamValue += ` - ${ss.end_error}`;
+        }
+        expandDataLocal.push({
+          key: t('流状态'),
+          value: streamValue,
+        });
+        if (Array.isArray(ss.errors) && ss.errors.length > 0) {
+          expandDataLocal.push({
+            key: t('流错误详情'),
+            value: (
+              <div style={{ maxWidth: 600, whiteSpace: 'pre-line', wordBreak: 'break-word', lineHeight: 1.6 }}>
+                {ss.errors.join('\n')}
+              </div>
+            ),
+          });
+        }
+      }
       if (Array.isArray(other?.po) && other.po.length > 0) {
         expandDataLocal.push({
           key: t('参数覆盖'),

web/src/i18n/locales/en.json

@@ -2678,6 +2678,11 @@
     "请求结束后多退少补": "Adjust after request completion",
     "请求超时，请刷新页面后重新发起 GitHub 登录": "Request timed out, please refresh and restart GitHub login",
     "请求路径": "Request path",
+    "流状态": "Stream Status",
+    "流错误详情": "Stream Error Details",
+    "软错误": "soft errors",
+    "正常": "Normal",
+    "异常": "Abnormal",
     "请求转换": "Request conversion",
     "请求预扣费额度": "Pre-deduction quota for requests",
     "请点击我": "Please click me",