all: simplify nested complexity and if blocks ending with a return statement (#21854)

Changes:

    Simplify nested complexity
    If an if blocks ends with a return statement then remove the else nesting.

Most of the changes has also been reported in golint https://goreportcard.com/report/github.com/ethereum/go-ethereum#golint

les/benchmark.go

@@ -75,9 +75,8 @@ func (b *benchmarkBlockHeaders) init(h *serverHandler, count int) error {
 func (b *benchmarkBlockHeaders) request(peer *serverPeer, index int) error {
 	if b.byHash {
 		return peer.requestHeadersByHash(0, b.hashes[index], b.amount, b.skip, b.reverse)
-	} else {
-		return peer.requestHeadersByNumber(0, uint64(b.offset+rand.Int63n(b.randMax)), b.amount, b.skip, b.reverse)
 	}
+	return peer.requestHeadersByNumber(0, uint64(b.offset+rand.Int63n(b.randMax)), b.amount, b.skip, b.reverse)
 }
 
 // benchmarkBodiesOrReceipts implements requestBenchmark
@@ -98,9 +97,8 @@ func (b *benchmarkBodiesOrReceipts) init(h *serverHandler, count int) error {
 func (b *benchmarkBodiesOrReceipts) request(peer *serverPeer, index int) error {
 	if b.receipts {
 		return peer.requestReceipts(0, []common.Hash{b.hashes[index]})
-	} else {
-		return peer.requestBodies(0, []common.Hash{b.hashes[index]})
 	}
+	return peer.requestBodies(0, []common.Hash{b.hashes[index]})
 }
 
 // benchmarkProofsOrCode implements requestBenchmark
@@ -119,9 +117,8 @@ func (b *benchmarkProofsOrCode) request(peer *serverPeer, index int) error {
 	rand.Read(key)
 	if b.code {
 		return peer.requestCode(0, []CodeReq{{BHash: b.headHash, AccKey: key}})
-	} else {
-		return peer.requestProofs(0, []ProofReq{{BHash: b.headHash, Key: key}})
 	}
+	return peer.requestProofs(0, []ProofReq{{BHash: b.headHash, Key: key}})
 }
 
 // benchmarkHelperTrie implements requestBenchmark

les/lespay/server/balance.go

@@ -588,9 +588,8 @@ func (n *NodeBalance) timeUntil(priority int64) (time.Duration, bool) {
 			}
 			dt = float64(posBalance-newBalance) / timePrice
 			return time.Duration(dt), true
-		} else {
-			dt = float64(posBalance) / timePrice
 		}
+		dt = float64(posBalance) / timePrice
 	} else {
 		if priority > 0 {
 			return 0, false

les/lespay/server/balance_tracker.go

@@ -261,9 +261,8 @@ func (bt *BalanceTracker) storeBalance(id []byte, neg bool, value utils.ExpiredV
 func (bt *BalanceTracker) canDropBalance(now mclock.AbsTime, neg bool, b utils.ExpiredValue) bool {
 	if neg {
 		return b.Value(bt.negExp.LogOffset(now)) <= negThreshold
-	} else {
-		return b.Value(bt.posExp.LogOffset(now)) <= posThreshold
 	}
+	return b.Value(bt.posExp.LogOffset(now)) <= posThreshold
 }
 
 // updateTotalBalance adjusts the total balance after executing given callback.

les/lespay/server/prioritypool.go

@@ -288,9 +288,8 @@ func activePriority(a interface{}, now mclock.AbsTime) int64 {
 	}
 	if c.bias == 0 {
 		return invertPriority(c.nodePriority.Priority(now, c.capacity))
-	} else {
-		return invertPriority(c.nodePriority.EstMinPriority(now+mclock.AbsTime(c.bias), c.capacity, true))
 	}
+	return invertPriority(c.nodePriority.EstMinPriority(now+mclock.AbsTime(c.bias), c.capacity, true))
 }
 
 // activeMaxPriority callback returns estimated maximum priority of ppNodeInfo item in activeQueue

les/odr_requests.go

@@ -329,9 +329,8 @@ func (r *ChtRequest) CanSend(peer *serverPeer) bool {
 
 	if r.Untrusted {
 		return peer.headInfo.Number >= r.BlockNum && peer.id == r.PeerId
-	} else {
-		return peer.headInfo.Number >= r.Config.ChtConfirms && r.ChtNum <= (peer.headInfo.Number-r.Config.ChtConfirms)/r.Config.ChtSize
 	}
+	return peer.headInfo.Number >= r.Config.ChtConfirms && r.ChtNum <= (peer.headInfo.Number-r.Config.ChtConfirms)/r.Config.ChtSize
 }
 
 // Request sends an ODR request to the LES network (implementation of LesOdrRequest)

les/serverpool.go

@@ -112,9 +112,8 @@ var (
 				}
 				enc, err := rlp.EncodeToBytes(&ne)
 				return enc, err
-			} else {
-				return nil, errors.New("invalid field type")
 			}
+			return nil, errors.New("invalid field type")
 		},
 		func(enc []byte) (interface{}, error) {
 			var ne nodeHistoryEnc

les/serverpool_test.go

@@ -119,31 +119,28 @@ func (s *serverPoolTest) start() {
 				s.clock.Sleep(time.Second * 5)
 				s.endWait()
 				return -1
-			} else {
-				switch idx % 3 {
-				case 0:
-					// pre-neg returns true only if connection is possible
-					if canConnect {
-						return 1
-					} else {
-						return 0
-					}
-				case 1:
-					// pre-neg returns true but connection might still fail
+			}
+			switch idx % 3 {
+			case 0:
+				// pre-neg returns true only if connection is possible
+				if canConnect {
 					return 1
-				case 2:
-					// pre-neg returns true if connection is possible, otherwise timeout (node unresponsive)
-					if canConnect {
-						return 1
-					} else {
-						s.beginWait()
-						s.clock.Sleep(time.Second * 5)
-						s.endWait()
-						return -1
-					}
 				}
+				return 0
+			case 1:
+				// pre-neg returns true but connection might still fail
+				return 1
+			case 2:
+				// pre-neg returns true if connection is possible, otherwise timeout (node unresponsive)
+				if canConnect {
+					return 1
+				}
+				s.beginWait()
+				s.clock.Sleep(time.Second * 5)
+				s.endWait()
 				return -1
 			}
+			return -1
 		}
 	}