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Serialize writes of the JSON playlist
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package drivers | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| "github.com/golang/glog" | ||
| "github.com/livepeer/go-livepeer/common" | ||
| ) | ||
|
|
||
| const ( | ||
| timeoutMultiplier = 1.5 | ||
| ) | ||
|
|
||
| type ( | ||
| OvewriteQueue struct { | ||
| desc string | ||
| name string | ||
| session OSSession | ||
| maxRetries int | ||
| initialTimeout time.Duration | ||
| maxTimeout time.Duration | ||
| queue chan []byte | ||
| quit chan struct{} | ||
| } | ||
| ) | ||
|
|
||
| func NewOverwriteQueue(session OSSession, name, desc string, maxRetries int, initialTimeout, maxTimeout time.Duration) *OvewriteQueue { | ||
| oq := &OvewriteQueue{ | ||
| desc: desc, | ||
| name: name, | ||
| maxRetries: maxRetries, | ||
| session: session, | ||
| initialTimeout: initialTimeout, | ||
| maxTimeout: maxTimeout, | ||
| queue: make(chan []byte, 32), | ||
| quit: make(chan struct{}), | ||
| } | ||
| if maxRetries < 1 { | ||
| panic("maxRetries should be greater than zero") | ||
| } | ||
| go oq.workerLoop() | ||
| return oq | ||
| } | ||
|
|
||
| // Save queues data to be saved | ||
| func (oq *OvewriteQueue) Save(data []byte) { | ||
| oq.queue <- data | ||
| } | ||
|
|
||
| // StopAfter stops reading loop after some time | ||
| func (oq *OvewriteQueue) StopAfter(pause time.Duration) { | ||
| go func(p time.Duration) { | ||
| time.Sleep(p) | ||
| close(oq.quit) | ||
| }(pause) | ||
| } | ||
|
|
||
| // waitForQueueToClear used in tests | ||
| func (oq *OvewriteQueue) waitForQueueToClear(timeout time.Duration) { | ||
| // wait for work to be queued | ||
| time.Sleep(5 * time.Millisecond) | ||
| start := time.Now() | ||
| for { | ||
| if len(oq.queue) == 0 { | ||
| return | ||
| } | ||
| if time.Since(start) > timeout { | ||
| return | ||
| } | ||
| time.Sleep(20 * time.Millisecond) | ||
| } | ||
| } | ||
|
|
||
| func (oq *OvewriteQueue) workerLoop() { | ||
| var err error | ||
| var took time.Duration | ||
| for { | ||
| select { | ||
| case data := <-oq.queue: | ||
| timeout := oq.initialTimeout | ||
| for try := 0; try < oq.maxRetries; try++ { | ||
| // we only care about last data | ||
| data = oq.getLastMessage(data) | ||
| glog.V(common.VERBOSE).Infof("Start saving %s name=%s bytes=%d try=%d", oq.desc, oq.name, len(data), try) | ||
| now := time.Now() | ||
| _, err = oq.session.SaveData(oq.name, data, nil, timeout) | ||
| took := time.Since(now) | ||
| if err == nil { | ||
| glog.V(common.VERBOSE).Infof("Saving %s name=%s bytes=%d took=%s try=%d", oq.desc, oq.name, | ||
| len(data), took, try) | ||
| break | ||
| } | ||
| timeout = time.Duration(float64(timeout) * timeoutMultiplier) | ||
| if timeout > oq.maxTimeout { | ||
| timeout = oq.maxTimeout | ||
| } | ||
| } | ||
| if err != nil { | ||
| glog.Errorf("Error saving %s name=%s bytes=%d took=%s try=%d err=%v", oq.desc, oq.name, | ||
| len(data), took, oq.maxRetries, err) | ||
| } | ||
|
|
||
| case <-oq.quit: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (oq *OvewriteQueue) getLastMessage(current []byte) []byte { | ||
| res := current | ||
| for { | ||
| select { | ||
| case data := <-oq.queue: | ||
| res = data | ||
| default: | ||
| return res | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package drivers | ||
|
|
||
| import ( | ||
| "errors" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func TestOverwriteQueueShouldCallSave(t *testing.T) { | ||
| timeout := 500 * time.Millisecond | ||
| mos := &MockOSSession{} | ||
| oq := NewOverwriteQueue(mos, "f1", "save", 2, timeout, 15*time.Second) | ||
|
|
||
| data1 := []byte("data01") | ||
|
|
||
| var meta map[string]string | ||
| mos.On("SaveData", "f1", data1, meta, timeout).Return("not used", nil).Once() | ||
|
|
||
| oq.Save(data1) | ||
| oq.waitForQueueToClear(5 * time.Second) | ||
| mos.AssertExpectations(t) | ||
| oq.StopAfter(0) | ||
| time.Sleep(10 * time.Millisecond) | ||
| } | ||
|
|
||
| func TestOverwriteQueueShouldRetry(t *testing.T) { | ||
| timeout := 500 * time.Millisecond | ||
| mos := &MockOSSession{} | ||
| oq := NewOverwriteQueue(mos, "f1", "retry", 2, timeout, 15*time.Second) | ||
|
|
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| data1 := []byte("data01") | ||
|
|
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| var meta map[string]string | ||
| mos.On("SaveData", "f1", data1, meta, timeout).Return("not used", errors.New("no1")).Once() | ||
| timeout = time.Duration(float64(timeout) * timeoutMultiplier) | ||
| mos.On("SaveData", "f1", data1, meta, timeout).Return("not used", nil).Once() | ||
|
|
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| oq.Save(data1) | ||
| oq.waitForQueueToClear(5 * time.Second) | ||
| mos.AssertExpectations(t) | ||
| oq.StopAfter(0) | ||
| time.Sleep(10 * time.Millisecond) | ||
| } | ||
|
|
||
| func TestOverwriteQueueShouldUseLastValue(t *testing.T) { | ||
| timeout := 300 * time.Millisecond | ||
| mos := &MockOSSession{} | ||
| mos.init() | ||
| oq := NewOverwriteQueue(mos, "f1", "use last", 2, timeout, 15*time.Second) | ||
|
|
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| dataw1 := []byte("dataw01") | ||
| data2 := []byte("data02") | ||
| data3 := []byte("data03") | ||
|
|
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| var meta map[string]string | ||
| mos.On("SaveData", "f1", dataw1, meta, timeout).Return("not used", nil).Once() | ||
| mos.On("SaveData", "f1", data3, meta, timeout).Return("not used", nil).Once() | ||
|
|
||
| mos.waitForCh = true | ||
| oq.Save(dataw1) | ||
| <-mos.back | ||
| oq.Save(data2) | ||
| oq.Save(data3) | ||
| mos.waitCh <- nil | ||
|
|
||
| oq.waitForQueueToClear(5 * time.Second) | ||
| mos.AssertExpectations(t) | ||
| oq.StopAfter(0) | ||
| time.Sleep(10 * time.Millisecond) | ||
| } |
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