127 lines
3.8 KiB
Go
127 lines
3.8 KiB
Go
package service
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// 国产供应商 Anthropic 协议转换路径的上游 SSE 行泵。
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//
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// 这两条转换链(CC×anthropic / Responses×anthropic)的上游 ctx 是
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// WithoutCancel(detachStreamUpstreamContext)、http.Client 无整体 Timeout,
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// 客户端断开后的排水阶段若上游挂住 SSE(不发数据也不断连),
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// scanner.Scan() 将永久阻塞:goroutine 钉死、resp.Body 不归还、连接池位
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// 被占用、usage 永不落库。
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//
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// 与 handleAnthropicStreamingResponse / readOpenAICompatBufferedTerminal 的
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// 同类排水一致,本泵用 gateway.stream_data_interval_timeout(默认 180s)作为
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// 逐行读间隔上限,超时即向调用方返回 errAnthropicNativeStreamIdle,由调用方
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// 关闭 resp.Body 解除阻塞的读并结束排水。
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import (
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"bufio"
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"errors"
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"io"
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"time"
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)
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// errAnthropicNativeStreamIdle 表示上游流读间隔超时(见上方文件注释)。
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var errAnthropicNativeStreamIdle = errors.New("stream data interval timeout")
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// anthropicNativeLineEvent 是行泵交付的单次读取结果:line 为一行 SSE 文本,
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// err 为 scanner 读错误(流自然结束时 next 返回 io.EOF,不经过本字段)。
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type anthropicNativeLineEvent struct {
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line string
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err error
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}
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// anthropicNativeLinePump 以独立 goroutine 泵送 scanner 的行,并对逐行到达
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// 间隔施加 interval 上限(<=0 表示禁用,保持无界读的旧行为)。
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type anthropicNativeLinePump struct {
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events chan anthropicNativeLineEvent
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done chan struct{}
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timer *time.Timer
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interval time.Duration
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}
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// newAnthropicNativeLinePump 启动泵 goroutine;调用方 defer pump.stop()。
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func newAnthropicNativeLinePump(scanner *bufio.Scanner, interval time.Duration) *anthropicNativeLinePump {
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p := &anthropicNativeLinePump{
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events: make(chan anthropicNativeLineEvent, 16),
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done: make(chan struct{}),
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interval: interval,
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}
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if interval > 0 {
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p.timer = time.NewTimer(interval)
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}
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go func() {
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defer close(p.events)
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for scanner.Scan() {
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select {
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case p.events <- anthropicNativeLineEvent{line: scanner.Text()}:
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case <-p.done:
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return
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}
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}
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if err := scanner.Err(); err != nil {
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select {
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case p.events <- anthropicNativeLineEvent{err: err}:
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case <-p.done:
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}
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}
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}()
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return p
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}
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// next 阻塞返回下一行。返回 io.EOF 表示上游正常收流;errAnthropicNativeStreamIdle
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// 表示 interval 内无任何数据到达(计时从收到上一行时起算,事件处理耗时不算入,
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// 与 readOpenAICompatBufferedTerminal 的 resetTimeout 语义一致)。
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func (p *anthropicNativeLinePump) next() (string, error) {
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var timeoutCh <-chan time.Time
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if p.timer != nil {
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timeoutCh = p.timer.C
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}
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select {
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case ev, ok := <-p.events:
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if !ok {
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return "", io.EOF
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}
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p.resetTimer()
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return ev.line, ev.err
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case <-timeoutCh:
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return "", errAnthropicNativeStreamIdle
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}
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}
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// resetTimer 在收到一行后重启间隔计时器。
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func (p *anthropicNativeLinePump) resetTimer() {
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if p.timer == nil {
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return
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}
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if !p.timer.Stop() {
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select {
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case <-p.timer.C:
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default:
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}
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}
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p.timer.Reset(p.interval)
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}
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// stop 终止泵 goroutine。注意:goroutine 若正阻塞在 scanner.Read 上,需由
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// 调用方关闭 resp.Body(间隔超时分支已做)才能真正退出。
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func (p *anthropicNativeLinePump) stop() {
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close(p.done)
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if p.timer != nil {
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if !p.timer.Stop() {
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select {
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case <-p.timer.C:
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default:
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}
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}
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}
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}
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// anthropicNativeStreamInterval 返回本组转换路径适用的读间隔上限;
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// gateway.stream_data_interval_timeout <= 0 时视为禁用。
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func (s *OpenAIGatewayService) anthropicNativeStreamInterval() time.Duration {
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if s.cfg != nil && s.cfg.Gateway.StreamDataIntervalTimeout > 0 {
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return time.Duration(s.cfg.Gateway.StreamDataIntervalTimeout) * time.Second
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}
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return 0
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}
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