func()

in pulsar/producer_partition.go [914:1004]

• 68 lines of code
• 14 McCabe index (conditional complexity)

func (p *partitionProducer) failTimeoutMessages() {
	diff := func(sentAt time.Time) time.Duration {
		return p.options.SendTimeout - time.Since(sentAt)
	}

	t := time.NewTimer(p.options.SendTimeout)
	defer t.Stop()

	for range t.C {
		state := p.getProducerState()
		if state == producerClosing || state == producerClosed {
			return
		}

		item := p.pendingQueue.Peek()
		if item == nil {
			// pending queue is empty
			t.Reset(p.options.SendTimeout)
			continue
		}
		oldestItem := item.(*pendingItem)
		if nextWaiting := diff(oldestItem.createdAt); nextWaiting > 0 {
			// none of these pending messages have timed out, wait and retry
			t.Reset(nextWaiting)
			continue
		}

		// since pending queue is not thread safe because of there is no global iteration lock
		// to control poll from pending queue, current goroutine and connection receipt handler
		// iterate pending queue at the same time, this maybe a performance trade-off
		// see https://github.com/apache/pulsar-client-go/pull/301
		curViewItems := p.pendingQueue.ReadableSlice()
		viewSize := len(curViewItems)
		if viewSize <= 0 {
			// double check
			t.Reset(p.options.SendTimeout)
			continue
		}
		p.log.Infof("Failing %d messages on timeout %s", viewSize, p.options.SendTimeout)
		lastViewItem := curViewItems[viewSize-1].(*pendingItem)

		// iterate at most viewSize items
		for i := 0; i < viewSize; i++ {
			tickerNeedWaiting := time.Duration(0)
			item := p.pendingQueue.CompareAndPoll(
				func(m interface{}) bool {
					if m == nil {
						return false
					}

					pi := m.(*pendingItem)
					pi.Lock()
					defer pi.Unlock()
					if nextWaiting := diff(pi.createdAt); nextWaiting > 0 {
						// current and subsequent items not timeout yet, stop iterating
						tickerNeedWaiting = nextWaiting
						return false
					}
					return true
				})

			if item == nil {
				t.Reset(p.options.SendTimeout)
				break
			}

			if tickerNeedWaiting > 0 {
				t.Reset(tickerNeedWaiting)
				break
			}

			pi := item.(*pendingItem)
			pi.Lock()

			for _, i := range pi.sendRequests {
				sr := i.(*sendRequest)
				sr.done(nil, ErrSendTimeout)
			}

			// flag the sending has completed with error, flush make no effect
			pi.done(ErrSendTimeout)
			pi.Unlock()

			// finally reached the last view item, current iteration ends
			if pi == lastViewItem {
				t.Reset(p.options.SendTimeout)
				break
			}
		}
	}
}