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authorDeterminant <[email protected]>2019-10-21 14:47:51 -0400
committerDeterminant <[email protected]>2019-10-21 14:47:51 -0400
commit79b1169a9ff0b54ddf3b520a70a79c78ba5c988d (patch)
tree13fc62be3ebf344544547eeb9979450a3c6ecd40 /core/tx_noncer.go
parent913e9439a7c7883881895ee597a0cc464fb92353 (diff)
customize Blockchain code
Diffstat (limited to 'core/tx_noncer.go')
-rw-r--r--core/tx_noncer.go79
1 files changed, 79 insertions, 0 deletions
diff --git a/core/tx_noncer.go b/core/tx_noncer.go
new file mode 100644
index 0000000..d52e267
--- /dev/null
+++ b/core/tx_noncer.go
@@ -0,0 +1,79 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+ "sync"
+
+ "github.com/ava-labs/go-ethereum/common"
+ "github.com/ava-labs/go-ethereum/core/state"
+)
+
+// txNoncer is a tiny virtual state database to manage the executable nonces of
+// accounts in the pool, falling back to reading from a real state database if
+// an account is unknown.
+type txNoncer struct {
+ fallback *state.StateDB
+ nonces map[common.Address]uint64
+ lock sync.Mutex
+}
+
+// newTxNoncer creates a new virtual state database to track the pool nonces.
+func newTxNoncer(statedb *state.StateDB) *txNoncer {
+ return &txNoncer{
+ fallback: statedb.Copy(),
+ nonces: make(map[common.Address]uint64),
+ }
+}
+
+// get returns the current nonce of an account, falling back to a real state
+// database if the account is unknown.
+func (txn *txNoncer) get(addr common.Address) uint64 {
+ // We use mutex for get operation is the underlying
+ // state will mutate db even for read access.
+ txn.lock.Lock()
+ defer txn.lock.Unlock()
+
+ if _, ok := txn.nonces[addr]; !ok {
+ txn.nonces[addr] = txn.fallback.GetNonce(addr)
+ }
+ return txn.nonces[addr]
+}
+
+// set inserts a new virtual nonce into the virtual state database to be returned
+// whenever the pool requests it instead of reaching into the real state database.
+func (txn *txNoncer) set(addr common.Address, nonce uint64) {
+ txn.lock.Lock()
+ defer txn.lock.Unlock()
+
+ txn.nonces[addr] = nonce
+}
+
+// setIfLower updates a new virtual nonce into the virtual state database if the
+// the new one is lower.
+func (txn *txNoncer) setIfLower(addr common.Address, nonce uint64) {
+ txn.lock.Lock()
+ defer txn.lock.Unlock()
+
+ if _, ok := txn.nonces[addr]; !ok {
+ txn.nonces[addr] = txn.fallback.GetNonce(addr)
+ }
+ if txn.nonces[addr] <= nonce {
+ return
+ }
+ txn.nonces[addr] = nonce
+}