update dependencies and use preset decay fns

go.mod

 module github.com/libp2p/go-libp2p-pubsub
 
 require (
-	github.com/benbjohnson/clock v1.0.0
+	github.com/benbjohnson/clock v1.0.1
 	github.com/gogo/protobuf v1.3.1
 	github.com/ipfs/go-log v1.0.4
 	github.com/libp2p/go-libp2p-blankhost v0.1.6

go.sum

@@ -5,6 +5,7 @@ github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAE
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/benbjohnson/clock v1.0.0/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
+github.com/benbjohnson/clock v1.0.1/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
 github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8=
 github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btcd v0.0.0-20190824003749-130ea5bddde3/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=

tag_tracer.go

@@ -141,22 +141,11 @@ func (t *tagTracer) decayingDeliveryTag(topic string) (connmgr.DecayingTag, erro
 	}
 	name := fmt.Sprintf("pubsub-deliveries:%s", topic)
 
-	// decrement tag value by GossipSubConnTagDecayAmount at each decay interval
-	decayFn := func(value connmgr.DecayingValue) (after int, rm bool) {
-		v := value.Value - GossipSubConnTagDecayAmount
-		return v, v <= 0
-	}
-
-	// bump up to max of GossipSubConnTagMessageDeliveryCap
-	bumpFn := func(value connmgr.DecayingValue, delta int) (after int) {
-		val := value.Value + delta
-		if val > GossipSubConnTagMessageDeliveryCap {
-			return GossipSubConnTagMessageDeliveryCap
-		}
-		return val
-	}
-
-	return t.decayer.RegisterDecayingTag(name, GossipSubConnTagDecayInterval, decayFn, bumpFn)
+	return t.decayer.RegisterDecayingTag(
+		name,
+		GossipSubConnTagDecayInterval,
+		connmgr.DecayFixed(GossipSubConnTagDecayAmount),
+		connmgr.BumpSumBounded(0, GossipSubConnTagMessageDeliveryCap))
 }
 
 func (t *tagTracer) bumpDeliveryTag(p peer.ID, topic string) error {