Method loop

core/tx_pool.go:349–445

loop is the transaction pool's main event loop, waiting for and reacting to outside blockchain events as well as for various reporting and transaction eviction events.

()

// outside blockchain events as well as for various reporting and transaction
// eviction events.
func (pool *TxPool) loop() {
	defer pool.wg.Done()

	// Start the stats reporting and transaction eviction tickers
	var prevPending, prevQueued, prevStales int

	report := time.NewTicker(statsReportInterval)
	defer report.Stop()

	evict := time.NewTicker(evictionInterval)
	defer evict.Stop()

	journal := time.NewTicker(pool.config.Rejournal)
	defer journal.Stop()

	rebroadcast := time.NewTicker(rebroadcastTriggerTime)
	defer rebroadcast.Stop()

	// Track the previous head headers for transaction reorgs
	head := pool.chain.CurrentBlock()

	// Keep waiting for and reacting to the various events
	for {
		select {
		// Handle ChainHeadEvent
		case ev := <-pool.chainHeadCh:
			if ev.Block != nil {
				pool.mu.Lock()
				pool.reset(head.Header(), ev.Block.Header())
				head = ev.Block

				pool.mu.Unlock()
			}
		// Be unsubscribed due to system stopped
		case <-pool.chainHeadSub.Err():
			return

		// Handle stats reporting ticks
		case <-report.C:
			pool.mu.RLock()
			pending, queued := pool.stats()
			stales := pool.priced.stales
			pool.mu.RUnlock()

			if pending != prevPending || queued != prevQueued || stales != prevStales {
				log.Debug("Transaction pool status report", "executable", pending, "queued", queued, "stales", stales)
				prevPending, prevQueued, prevStales = pending, queued, stales
			}

		// Handle inactive account transaction eviction
		case <-evict.C:
			pool.mu.Lock()
			for addr := range pool.queue {
				// Skip local transactions from the eviction mechanism
				if pool.locals.contains(addr) {
					continue
				}
				// Any non-locals old enough should be removed