wehub-resource-sync
87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
package ws
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import (
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"errors"
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"net/http"
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"net/http/httptest"
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"strings"
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"sync"
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"testing"
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"time"
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"github.com/gorilla/websocket"
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)
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// 回归 C2a-residual：Send 非阻塞——send 缓冲满后立即返回 ErrSendBufferFull，
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// 不阻塞调用方。旧实现（阻塞 select + 缓冲满）会阻塞，Hub 广播持写锁期间 stall。
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//
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// 用 internal test 直接构造 Connection（绕过 Handle），不启动 writePump 消费 send，
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// 填满缓冲后 Send 必须立即返回 ErrSendBufferFull。
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func TestSendNonBlockingBufferFullInternal(t *testing.T) {
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// 建一对真实 websocket conn 作为底层。
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var srvConn *websocket.Conn
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var mu sync.Mutex
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srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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u := websocket.Upgrader{CheckOrigin: func(*http.Request) bool { return true }}
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c, err := u.Upgrade(w, r, nil)
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if err != nil {
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return
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}
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mu.Lock()
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srvConn = c
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mu.Unlock()
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// 阻塞读保持连接存活。
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for {
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if _, _, err := c.ReadMessage(); err != nil {
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return
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}
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}
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}))
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defer srv.Close()
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dialer := &websocket.Dialer{HandshakeTimeout: 2 * time.Second}
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client, _, err := dialer.Dial("ws"+strings.TrimPrefix(srv.URL, "http")+"/", nil)
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if err != nil {
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t.Fatalf("dial: %v", err)
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}
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defer client.Close()
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// 等待服务端 conn 就绪。
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deadline := time.Now().Add(2 * time.Second)
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for time.Now().Before(deadline) {
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mu.Lock()
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if srvConn != nil {
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mu.Unlock()
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break
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}
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mu.Unlock()
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time.Sleep(5 * time.Millisecond)
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}
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if srvConn == nil {
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t.Fatal("server-side conn not ready")
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}
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defer srvConn.Close()
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conn := NewConnection(srvConn)
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defer conn.Close()
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// 不启动 writePump，send 无消费者。填满缓冲（256）。
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for i := 0; i < 256; i++ {
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if err := conn.Send([]byte("x")); err != nil {
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t.Fatalf("filling buffer[%d] err = %v", i, err)
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}
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}
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// 第 257 个必须立即返回 ErrSendBufferFull（非阻塞）。
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done := make(chan error, 1)
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go func() {
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done <- conn.Send([]byte("overflow"))
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}()
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select {
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case err := <-done:
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if !errors.Is(err, ErrSendBufferFull) {
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t.Errorf("overflow Send err = %v, want ErrSendBufferFull", err)
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}
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case <-time.After(2 * time.Second):
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t.Fatal("Send on full buffer blocked (should be non-blocking)")
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}
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}
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