fix(stream): default non-positive streaming timeout

relay/helper/stream_scanner.go

@@ -24,6 +24,7 @@ import (
 const (
 	InitialScannerBufferSize    = 64 << 10 // 64KB (64*1024)
 	DefaultMaxScannerBufferSize = 64 << 20 // 64MB (64*1024*1024) default SSE buffer size
+	DefaultStreamingTimeout     = 300 * time.Second
 	DefaultPingInterval         = 10 * time.Second
 )
 
@@ -48,6 +49,9 @@ func StreamScannerHandler(c *gin.Context, resp *http.Response, info *relaycommon
 	}()
 
 	streamingTimeout := time.Duration(constant.StreamingTimeout) * time.Second
+	if streamingTimeout <= 0 {
+		streamingTimeout = DefaultStreamingTimeout
+	}
 
 	var (
 		stopChan   = make(chan bool, 3) // 增加缓冲区避免阻塞

relay/helper/stream_scanner_test.go

@@ -97,6 +97,24 @@ func TestStreamScannerHandler_EmptyBody(t *testing.T) {
 	assert.False(t, called.Load(), "handler should not be called for empty body")
 }
 
+func TestStreamScannerHandler_NonPositiveStreamingTimeoutDoesNotPanic(t *testing.T) {
+	oldTimeout := constant.StreamingTimeout
+	constant.StreamingTimeout = 0
+	t.Cleanup(func() {
+		constant.StreamingTimeout = oldTimeout
+	})
+
+	recorder := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(recorder)
+	c.Request = httptest.NewRequest(http.MethodPost, "/v1/chat/completions", nil)
+	resp := &http.Response{Body: io.NopCloser(strings.NewReader(""))}
+	info := &relaycommon.RelayInfo{ChannelMeta: &relaycommon.ChannelMeta{}}
+
+	require.NotPanics(t, func() {
+		StreamScannerHandler(c, resp, info, func(data string) bool { return true })
+	})
+}
+
 func TestStreamScannerHandler_1000Chunks(t *testing.T) {
 	t.Parallel()