htlcswitch/switch: add log/fwd event tickers to Config

htlcswitch/switch.go

@@ -21,6 +21,17 @@ import (
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/ticker"
+)
+
+const (
+	// DefaultFwdEventInterval is the duration between attempts to flush
+	// pending forwarding events to disk.
+	DefaultFwdEventInterval = 15 * time.Second
+
+	// DefaultLogInterval is the duration between attempts to log statistics
+	// about forwarding events.
+	DefaultLogInterval = 10 * time.Second
 )
 
 var (
@@ -146,6 +157,14 @@ type Config struct {
 	// Notifier is an instance of a chain notifier that we'll use to signal
 	// the switch when a new block has arrived.
 	Notifier chainntnfs.ChainNotifier
+
+	// FwdEventTicker is a signal that instructs the htlcswitch to flush any
+	// pending forwarding events.
+	FwdEventTicker ticker.Ticker
+
+	// LogEventTicker is a signal instructing the htlcswitch to log
+	// aggregate stats about it's forwarding during the last interval.
+	LogEventTicker ticker.Ticker
 }
 
 // Switch is the central messaging bus for all incoming/outgoing HTLCs.
@@ -1390,13 +1409,13 @@ func (s *Switch) htlcForwarder() {
 		totalSatSent    btcutil.Amount
 		totalSatRecv    btcutil.Amount
 	)
-	logTicker := time.NewTicker(10 * time.Second)
-	defer logTicker.Stop()
+	s.cfg.LogEventTicker.Resume()
+	defer s.cfg.LogEventTicker.Stop()
 
 	// Every 15 seconds, we'll flush out the forwarding events that
 	// occurred during that period.
-	fwdEventTicker := time.NewTicker(15 * time.Second)
-	defer fwdEventTicker.Stop()
+	s.cfg.FwdEventTicker.Resume()
+	defer s.cfg.FwdEventTicker.Stop()
 
 out:
 	for {
@@ -1474,7 +1493,7 @@ out:
 		// When this time ticks, then it indicates that we should
 		// collect all the forwarding events since the last internal,
 		// and write them out to our log.
-		case <-fwdEventTicker.C:
+		case <-s.cfg.FwdEventTicker.Ticks():
 			s.wg.Add(1)
 			go func() {
 				defer s.wg.Done()
@@ -1488,7 +1507,7 @@ out:
 		// The log ticker has fired, so we'll calculate some forwarding
 		// stats for the last 10 seconds to display within the logs to
 		// users.
-		case <-logTicker.C:
+		case <-s.cfg.LogEventTicker.Ticks():
 			// First, we'll collate the current running tally of
 			// our forwarding stats.
 			prevSatSent := totalSatSent