Golang T.receivedFirstProgress方法代碼示例

func TestDuplicateTransfer(t *testing.T) {
	ready := make(chan struct{})

	var xferFuncCalls int32

	makeXferFunc := func(id string) DoFunc {
		return func(progressChan chan<- progress.Progress, start <-chan struct{}, inactive chan<- struct{}) Transfer {
			atomic.AddInt32(&xferFuncCalls, 1)
			xfer := NewTransfer()
			go func() {
				defer func() {
					close(progressChan)
				}()
				<-ready
				for i := int64(0); ; i++ {
					select {
					case <-time.After(10 * time.Millisecond):
					case <-xfer.Context().Done():
						return
					}
					progressChan <- progress.Progress{ID: id, Action: "testing", Current: i, Total: 10}
				}
			}()
			return xfer
		}
	}

	tm := NewTransferManager(5)

	type transferInfo struct {
		xfer                  Transfer
		watcher               *Watcher
		progressChan          chan progress.Progress
		progressDone          chan struct{}
		receivedFirstProgress chan struct{}
	}

	progressConsumer := func(t transferInfo) {
		first := true
		for range t.progressChan {
			if first {
				close(t.receivedFirstProgress)
			}
			first = false
		}
		close(t.progressDone)
	}

	// Try to start multiple transfers with the same ID
	transfers := make([]transferInfo, 5)
	for i := range transfers {
		t := &transfers[i]
		t.progressChan = make(chan progress.Progress)
		t.progressDone = make(chan struct{})
		t.receivedFirstProgress = make(chan struct{})
		t.xfer, t.watcher = tm.Transfer("id1", makeXferFunc("id1"), progress.ChanOutput(t.progressChan))
		go progressConsumer(*t)
	}

	// Allow the transfer goroutine to proceed.
	close(ready)

	// Confirm that each watcher gets progress output.
	for _, t := range transfers {
		<-t.receivedFirstProgress
	}

	// Confirm that the transfer function was called exactly once.
	if xferFuncCalls != 1 {
		t.Fatal("transfer function wasn't called exactly once")
	}

	// Release one watcher every 5ms
	for _, t := range transfers {
		t.xfer.Release(t.watcher)
		<-time.After(5 * time.Millisecond)
	}

	for _, t := range transfers {
		// Now that all watchers have been released, Released() should
		// return a closed channel.
		<-t.xfer.Released()
		// Done() should return a closed channel because the xfer func returned
		// due to cancellation.
		<-t.xfer.Done()
	}

	for _, t := range transfers {
		close(t.progressChan)
		<-t.progressDone
	}
}