build: enable goimports and varcheck linters (#16446)

les/bloombits.go

@@ -72,13 +72,3 @@ func (eth *LightEthereum) startBloomHandlers() {
 		}()
 	}
 }
-
-const (
-	// bloomConfirms is the number of confirmation blocks before a bloom section is
-	// considered probably final and its rotated bits are calculated.
-	bloomConfirms = 256
-
-	// bloomThrottling is the time to wait between processing two consecutive index
-	// sections. It's useful during chain upgrades to prevent disk overload.
-	bloomThrottling = 100 * time.Millisecond
-)

les/serverpool.go

@@ -73,7 +73,6 @@ const (
 	// and a short term value which is adjusted exponentially with a factor of
 	// pstatRecentAdjust with each dial/connection and also returned exponentially
 	// to the average with the time constant pstatReturnToMeanTC
-	pstatRecentAdjust   = 0.1
 	pstatReturnToMeanTC = time.Hour
 	// node address selection weight is dropped by a factor of exp(-addrFailDropLn) after
 	// each unsuccessful connection (restored after a successful one)
@@ -83,9 +82,6 @@ const (
 	responseScoreTC = time.Millisecond * 100
 	delayScoreTC    = time.Second * 5
 	timeoutPow      = 10
-	// peerSelectMinWeight is added to calculated weights at request peer selection
-	// to give poorly performing peers a little chance of coming back
-	peerSelectMinWeight = 0.005
 	// initStatsWeight is used to initialize previously unknown peers with good
 	// statistics to give a chance to prove themselves
 	initStatsWeight = 1

les/sync.go

@@ -25,11 +25,6 @@ import (
 	"github.com/ethereum/go-ethereum/light"
 )
 
-const (
-	//forceSyncCycle      = 10 * time.Second // Time interval to force syncs, even if few peers are available
-	minDesiredPeerCount = 5 // Amount of peers desired to start syncing
-)
-
 // syncer is responsible for periodically synchronising with the network, both
 // downloading hashes and blocks as well as handling the announcement handler.
 func (pm *ProtocolManager) syncer() {