Merge pull request #3413 from zsfelfoldi/light-topic4

les, p2p/discv5: implement server pool, improve peer selection, light fetcher and topic searching

light/lightchain.go

@@ -505,3 +505,14 @@ func (self *LightChain) SyncCht(ctx context.Context) bool {
 	}
 	return false
 }
+
+// LockChain locks the chain mutex for reading so that multiple canonical hashes can be
+// retrieved while it is guaranteed that they belong to the same version of the chain
+func (self *LightChain) LockChain() {
+	self.chainmu.RLock()
+}
+
+// UnlockChain unlocks the chain mutex
+func (self *LightChain) UnlockChain() {
+	self.chainmu.RUnlock()
+}

light/odr.go

@@ -48,6 +48,7 @@ type OdrRequest interface {
 // TrieID identifies a state or account storage trie
 type TrieID struct {
 	BlockHash, Root common.Hash
+	BlockNumber     uint64
 	AccKey          []byte
 }
 
@@ -55,9 +56,10 @@ type TrieID struct {
 // header.
 func StateTrieID(header *types.Header) *TrieID {
 	return &TrieID{
-		BlockHash: header.Hash(),
-		AccKey:    nil,
-		Root:      header.Root,
+		BlockHash:   header.Hash(),
+		BlockNumber: header.Number.Uint64(),
+		AccKey:      nil,
+		Root:        header.Root,
 	}
 }
 
@@ -66,9 +68,10 @@ func StateTrieID(header *types.Header) *TrieID {
 // checking Merkle proofs.
 func StorageTrieID(state *TrieID, addr common.Address, root common.Hash) *TrieID {
 	return &TrieID{
-		BlockHash: state.BlockHash,
-		AccKey:    crypto.Keccak256(addr[:]),
-		Root:      root,
+		BlockHash:   state.BlockHash,
+		BlockNumber: state.BlockNumber,
+		AccKey:      crypto.Keccak256(addr[:]),
+		Root:        root,
 	}
 }
 

light/odr_util.go

@@ -38,8 +38,9 @@ var (
 	ErrNoTrustedCht = errors.New("No trusted canonical hash trie")
 	ErrNoHeader     = errors.New("Header not found")
 
-	ChtFrequency  = uint64(4096)
-	trustedChtKey = []byte("TrustedCHT")
+	ChtFrequency     = uint64(4096)
+	ChtConfirmations = uint64(2048)
+	trustedChtKey    = []byte("TrustedCHT")
 )
 
 type ChtNode struct {