fix panic with nil value

les/backend.go

@@ -147,7 +147,7 @@ func lesTopic(genesisHash common.Hash, protocolVersion uint) discv5.Topic {
 	case lpv2:
 		name = "LES2"
 	default:
-		panic(nil)
+		panic("lesTopic")
 	}
 	return discv5.Topic(name + "@" + common.Bytes2Hex(genesisHash.Bytes()[0:8]))
 }

les/odr_requests.go

@@ -196,7 +196,7 @@ func (r *TrieRequest) GetCost(peer *peer) uint64 {
 	case lpv2:
 		return peer.GetRequestCost(GetProofsV2Msg, 1)
 	default:
-		panic(nil)
+		panic("TrieRequest GetCost")
 	}
 }
 
@@ -356,7 +356,7 @@ func (r *ChtRequest) GetCost(peer *peer) uint64 {
 	case lpv2:
 		return peer.GetRequestCost(GetHelperTrieProofsMsg, 1)
 	default:
-		panic(nil)
+		panic("ChtRequest GetCost")
 	}
 }
 

les/peer.go

@@ -279,7 +279,7 @@ func (p *peer) RequestProofs(reqID, cost uint64, reqs []ProofReq) error {
 	case lpv2:
 		return sendRequest(p.rw, GetProofsV2Msg, reqID, cost, reqs)
 	default:
-		panic(nil)
+		panic("peer RequestProofs")
 	}
 }
 
@@ -301,7 +301,7 @@ func (p *peer) RequestHelperTrieProofs(reqID, cost uint64, reqs []HelperTrieReq)
 	case lpv2:
 		return sendRequest(p.rw, GetHelperTrieProofsMsg, reqID, cost, reqs)
 	default:
-		panic(nil)
+		panic("peer RequestHelperTrieProofs")
 	}
 }
 
@@ -320,7 +320,7 @@ func (p *peer) SendTxs(reqID, cost uint64, txs types.Transactions) error {
 	case lpv2:
 		return sendRequest(p.rw, SendTxV2Msg, reqID, cost, txs)
 	default:
-		panic(nil)
+		panic("peer SendTxs")
 	}
 }
 

les/randselect.go

@@ -109,7 +109,7 @@ func (n *wrsNode) insert(item wrsItem, weight int64) int {
 	for n.items[branch] != nil && (n.level == 0 || n.items[branch].(*wrsNode).itemCnt == n.items[branch].(*wrsNode).maxItems) {
 		branch++
 		if branch == wrsBranches {
-			panic(nil)
+			panic("wrsNode insert: branch == wrsBranches")
 		}
 	}
 	n.itemCnt++
@@ -169,5 +169,5 @@ func (n *wrsNode) choose(val int64) (wrsItem, int64) {
 			val -= w
 		}
 	}
-	panic(nil)
+	panic("wrsNode choose")
 }

les/retrieve.go

@@ -306,7 +306,7 @@ func (r *sentReq) tryRequest() {
 	s, ok := r.sentTo[p]
 	r.lock.RUnlock()
 	if !ok {
-		panic(nil)
+		panic("sentReq tryRequest: !ok")
 	}
 
 	defer func() {

light/postprocess.go

@@ -22,11 +22,10 @@ import (
 	"math/big"
 	"time"
 
-	"github.com/XinFinOrg/XDPoSChain/core/rawdb"
-
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/common/bitutil"
 	"github.com/XinFinOrg/XDPoSChain/core"
+	"github.com/XinFinOrg/XDPoSChain/core/rawdb"
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/ethdb"
 	"github.com/XinFinOrg/XDPoSChain/log"
@@ -165,7 +164,7 @@ func (c *ChtIndexerBackend) Process(header *types.Header) {
 
 	td := core.GetTd(c.diskdb, hash, num)
 	if td == nil {
-		panic(nil)
+		panic("ChtIndexerBackend Process: td == nil")
 	}
 	var encNumber [8]byte
 	binary.BigEndian.PutUint64(encNumber[:], num)

p2p/discv5/ticket.go

@@ -441,7 +441,7 @@ func (s *ticketStore) removeTicketRef(ref ticketRef) {
 		}
 	}
 	if idx == -1 {
-		panic(nil)
+		panic("ticketStore removeTicketRef: idx == -1")
 	}
 	list = append(list[:idx], list[idx+1:]...)
 	if len(list) != 0 {
@@ -802,7 +802,7 @@ func (r *topicRadius) chooseLookupBucket(a, b int) int {
 			rnd--
 		}
 	}
-	panic(nil) // should never happen
+	panic("topicRadius chooseLookupBucket") // should never happen
 }
 
 func (r *topicRadius) needMoreLookups(a, b int, maxValue float64) bool {