- Stream[T]: Send(v T) type-safe; message type recovered from the instantiated Send signature (reflect has no type-args API) - method signatures reduced to (error), (T, error), (*Stream[T], error); the (T, *Stream, error) first-message form is gone — send it via Send - return T and stream message T now run checkType at bind time (Stream[any] remains the explicit untyped escape hatch) - generated clients: TS onMessage: (data: T); Go <-chan T - fix vacuous panic assertions (fmt.Sprint(nil) -> "<nil>") in hardening/route test catch helpers Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package fun
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import (
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"fmt"
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"reflect"
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"strings"
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"sync"
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)
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// streamMsgType 提取 *Stream[T] 的消息类型 T;非 Stream 指针返回 nil。
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// reflect 没有类型实参 API,但实例化类型的 Send 方法签名已替换——In(1) 即 T
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func streamMsgType(t reflect.Type) reflect.Type {
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if t.Kind() != reflect.Ptr || !strings.HasPrefix(t.Elem().Name(), "Stream[") {
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return nil
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}
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sm, ok := t.MethodByName("Send")
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if !ok || sm.Type.NumIn() != 2 {
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return nil
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}
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if _, ok := t.MethodByName("Inject"); !ok {
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return nil
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}
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return sm.Type.In(1)
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}
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// Stream 流式响应的业务句柄。
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// 业务方法返回 *Stream[T] 后,框架调用 Inject 注入推送通道;
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// 未注入时 Send/Close 自动阻塞等待,避免业务 goroutine 与注入之间的竞态。
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type Stream[T any] struct {
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mu sync.Mutex
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once sync.Once
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ready chan struct{}
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ch chan any
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done chan struct{}
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closed bool
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onClose func()
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}
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func (s *Stream[T]) getReady() chan struct{} {
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s.once.Do(func() {
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if s.ready == nil {
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s.ready = make(chan struct{})
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}
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})
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return s.ready
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}
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// Inject 注入推送通道与结束信号,由框架在方法返回后调用
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func (s *Stream[T]) Inject(ch chan any, done chan struct{}) {
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s.ch = ch
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s.done = done
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close(s.getReady())
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}
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// Send 推送一条消息;连接断开或流已关闭时返回错误
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func (s *Stream[T]) Send(message T) error {
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<-s.getReady()
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.closed {
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return fmt.Errorf("fun: stream closed")
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}
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select {
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case s.ch <- message:
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return nil
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case <-s.done:
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return fmt.Errorf("fun: stream closed")
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}
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}
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// Close 主动结束流,触发 OnClose 回调
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func (s *Stream[T]) Close() {
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<-s.getReady()
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s.mu.Lock()
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if s.closed {
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s.mu.Unlock()
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return
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}
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s.closed = true
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cb := s.onClose
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s.mu.Unlock()
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if cb != nil {
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cb()
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}
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close(s.ch)
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}
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// OnClose 注册关闭回调;可在业务方法 return *Stream[T] 之前同步调用。
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// 不得等待 Inject:Inject 只有业务方法返回后才发生,等待会形成循环依赖死锁。
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// 流已关闭时在锁外立即执行回调,避免回调重入 Stream 时自锁。
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func (s *Stream[T]) OnClose(cb func()) {
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if cb == nil {
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return
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}
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s.mu.Lock()
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if s.closed {
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s.mu.Unlock()
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cb()
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return
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}
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s.onClose = cb
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s.mu.Unlock()
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}
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