build: enable goimports and varcheck linters (#16446)

p2p/discv5/net.go

@@ -36,7 +36,6 @@ import (
 var (
 	errInvalidEvent = errors.New("invalid in current state")
 	errNoQuery      = errors.New("no pending query")
-	errWrongAddress = errors.New("unknown sender address")
 )
 
 const (
@@ -828,11 +827,10 @@ type nodeEvent uint
 //go:generate stringer -type=nodeEvent
 
 const (
-	invalidEvent nodeEvent = iota // zero is reserved
 
 	// Packet type events.
 	// These correspond to packet types in the UDP protocol.
-	pingPacket
+	pingPacket = iota + 1
 	pongPacket
 	findnodePacket
 	neighborsPacket

p2p/discv5/nodeevent_string.go

@@ -4,24 +4,14 @@ package discv5
 
 import "strconv"
 
-const (
-	_nodeEvent_name_0 = "invalidEventpingPacketpongPacketfindnodePacketneighborsPacketfindnodeHashPackettopicRegisterPackettopicQueryPackettopicNodesPacket"
-	_nodeEvent_name_1 = "pongTimeoutpingTimeoutneighboursTimeout"
-)
+const _nodeEvent_name = "pongTimeoutpingTimeoutneighboursTimeout"
 
-var (
-	_nodeEvent_index_0 = [...]uint8{0, 12, 22, 32, 46, 61, 79, 98, 114, 130}
-	_nodeEvent_index_1 = [...]uint8{0, 11, 22, 39}
-)
+var _nodeEvent_index = [...]uint8{0, 11, 22, 39}
 
 func (i nodeEvent) String() string {
-	switch {
-	case 0 <= i && i <= 8:
-		return _nodeEvent_name_0[_nodeEvent_index_0[i]:_nodeEvent_index_0[i+1]]
-	case 265 <= i && i <= 267:
-		i -= 265
-		return _nodeEvent_name_1[_nodeEvent_index_1[i]:_nodeEvent_index_1[i+1]]
-	default:
-		return "nodeEvent(" + strconv.FormatInt(int64(i), 10) + ")"
+	i -= 264
+	if i >= nodeEvent(len(_nodeEvent_index)-1) {
+		return "nodeEvent(" + strconv.FormatInt(int64(i+264), 10) + ")"
 	}
+	return _nodeEvent_name[_nodeEvent_index[i]:_nodeEvent_index[i+1]]
 }

p2p/discv5/table.go

@@ -38,7 +38,6 @@ const (
 	hashBits   = len(common.Hash{}) * 8
 	nBuckets   = hashBits + 1 // Number of buckets
 
-	maxBondingPingPongs = 16
 	maxFindnodeFailures = 5
 )
 

p2p/discv5/udp.go

@@ -36,25 +36,17 @@ const Version = 4
 
 // Errors
 var (
-	errPacketTooSmall   = errors.New("too small")
-	errBadPrefix        = errors.New("bad prefix")
-	errExpired          = errors.New("expired")
-	errUnsolicitedReply = errors.New("unsolicited reply")
-	errUnknownNode      = errors.New("unknown node")
-	errTimeout          = errors.New("RPC timeout")
-	errClockWarp        = errors.New("reply deadline too far in the future")
-	errClosed           = errors.New("socket closed")
+	errPacketTooSmall = errors.New("too small")
+	errBadPrefix      = errors.New("bad prefix")
+	errTimeout        = errors.New("RPC timeout")
 )
 
 // Timeouts
 const (
 	respTimeout = 500 * time.Millisecond
-	queryDelay  = 1000 * time.Millisecond
 	expiration  = 20 * time.Second
 
-	ntpFailureThreshold = 32               // Continuous timeouts after which to check NTP
-	ntpWarningCooldown  = 10 * time.Minute // Minimum amount of time to pass before repeating NTP warning
-	driftThreshold      = 10 * time.Second // Allowed clock drift before warning user
+	driftThreshold = 10 * time.Second // Allowed clock drift before warning user
 )
 
 // RPC request structures

p2p/discv5/udp_test.go

@@ -24,7 +24,6 @@ import (
 	"reflect"
 	"sync"
 	"testing"
-	"time"
 
 	"github.com/davecgh/go-spew/spew"
 	"github.com/ethereum/go-ethereum/common"
@@ -38,11 +37,7 @@ func init() {
 
 // shared test variables
 var (
-	futureExp          = uint64(time.Now().Add(10 * time.Hour).Unix())
-	testTarget         = NodeID{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}
-	testRemote         = rpcEndpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2}
-	testLocalAnnounced = rpcEndpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4}
-	testLocal          = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
+	testLocal = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
 )
 
 // type udpTest struct {