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* Implement Read/WriteDeadline * Return remained data on Read after Close * Test using nettest.TestConn
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // Package deadline provides deadline timer used to implement | ||
| // net.Conn compatible connection | ||
| package deadline | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| // Deadline signals updatable deadline timer. | ||
| type Deadline struct { | ||
| exceeded chan struct{} | ||
| stop chan struct{} | ||
| stopped chan bool | ||
| mu sync.RWMutex | ||
| } | ||
|
|
||
| // New creates new deadline timer. | ||
| func New() *Deadline { | ||
| d := &Deadline{ | ||
| exceeded: make(chan struct{}), | ||
| stop: make(chan struct{}), | ||
| stopped: make(chan bool, 1), | ||
| } | ||
| d.stopped <- true | ||
| return d | ||
| } | ||
|
|
||
| // Set new deadline. Zero value means no deadline. | ||
| func (d *Deadline) Set(t time.Time) { | ||
| d.mu.Lock() | ||
| defer d.mu.Unlock() | ||
|
|
||
| close(d.stop) | ||
|
|
||
| select { | ||
| case <-d.exceeded: | ||
| d.exceeded = make(chan struct{}) | ||
| default: | ||
| stopped := <-d.stopped | ||
| if !stopped { | ||
| d.exceeded = make(chan struct{}) | ||
| } | ||
| } | ||
| d.stop = make(chan struct{}) | ||
| d.stopped = make(chan bool, 1) | ||
|
|
||
| if t.IsZero() { | ||
| d.stopped <- true | ||
| return | ||
| } | ||
|
|
||
| if dur := time.Until(t); dur > 0 { | ||
| exceeded := d.exceeded | ||
| stopped := d.stopped | ||
| go func() { | ||
| select { | ||
| case <-time.After(dur): | ||
| close(exceeded) | ||
| stopped <- false | ||
| case <-d.stop: | ||
| stopped <- true | ||
| } | ||
| }() | ||
| return | ||
| } | ||
|
|
||
| close(d.exceeded) | ||
| d.stopped <- false | ||
| } | ||
|
|
||
| // Done receives deadline signal. | ||
| func (d *Deadline) Done() <-chan struct{} { | ||
| d.mu.RLock() | ||
| defer d.mu.RUnlock() | ||
| return d.exceeded | ||
| } |
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