ethdb, core: implement delete for db batch

core/blockchain.go

@@ -269,8 +269,8 @@ func (bc *BlockChain) SetHead(head uint64) error {
 	defer bc.mu.Unlock()
 
 	// Rewind the header chain, deleting all block bodies until then
-	delFn := func(hash common.Hash, num uint64) {
-		rawdb.DeleteBody(bc.db, hash, num)
+	delFn := func(db rawdb.DatabaseDeleter, hash common.Hash, num uint64) {
+		rawdb.DeleteBody(db, hash, num)
 	}
 	bc.hc.SetHead(head, delFn)
 	currentHeader := bc.hc.CurrentHeader()
@@ -1340,9 +1340,12 @@ func (bc *BlockChain) reorg(oldBlock, newBlock *types.Block) error {
 	diff := types.TxDifference(deletedTxs, addedTxs)
 	// When transactions get deleted from the database that means the
 	// receipts that were created in the fork must also be deleted
+	batch := bc.db.NewBatch()
 	for _, tx := range diff {
-		rawdb.DeleteTxLookupEntry(bc.db, tx.Hash())
+		rawdb.DeleteTxLookupEntry(batch, tx.Hash())
 	}
+	batch.Write()
+
 	if len(deletedLogs) > 0 {
 		go bc.rmLogsFeed.Send(RemovedLogsEvent{deletedLogs})
 	}

core/headerchain.go

@@ -156,13 +156,16 @@ func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, er
 	// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
 	if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
 		// Delete any canonical number assignments above the new head
+		batch := hc.chainDb.NewBatch()
 		for i := number + 1; ; i++ {
 			hash := rawdb.ReadCanonicalHash(hc.chainDb, i)
 			if hash == (common.Hash{}) {
 				break
 			}
-			rawdb.DeleteCanonicalHash(hc.chainDb, i)
+			rawdb.DeleteCanonicalHash(batch, i)
 		}
+		batch.Write()
+
 		// Overwrite any stale canonical number assignments
 		var (
 			headHash   = header.ParentHash
@@ -438,7 +441,7 @@ func (hc *HeaderChain) SetCurrentHeader(head *types.Header) {
 
 // DeleteCallback is a callback function that is called by SetHead before
 // each header is deleted.
-type DeleteCallback func(common.Hash, uint64)
+type DeleteCallback func(rawdb.DatabaseDeleter, common.Hash, uint64)
 
 // SetHead rewinds the local chain to a new head. Everything above the new head
 // will be deleted and the new one set.
@@ -448,22 +451,24 @@ func (hc *HeaderChain) SetHead(head uint64, delFn DeleteCallback) {
 	if hdr := hc.CurrentHeader(); hdr != nil {
 		height = hdr.Number.Uint64()
 	}
-
+	batch := hc.chainDb.NewBatch()
 	for hdr := hc.CurrentHeader(); hdr != nil && hdr.Number.Uint64() > head; hdr = hc.CurrentHeader() {
 		hash := hdr.Hash()
 		num := hdr.Number.Uint64()
 		if delFn != nil {
-			delFn(hash, num)
+			delFn(batch, hash, num)
 		}
-		rawdb.DeleteHeader(hc.chainDb, hash, num)
-		rawdb.DeleteTd(hc.chainDb, hash, num)
+		rawdb.DeleteHeader(batch, hash, num)
+		rawdb.DeleteTd(batch, hash, num)
 
 		hc.currentHeader.Store(hc.GetHeader(hdr.ParentHash, hdr.Number.Uint64()-1))
 	}
 	// Roll back the canonical chain numbering
 	for i := height; i > head; i-- {
-		rawdb.DeleteCanonicalHash(hc.chainDb, i)
+		rawdb.DeleteCanonicalHash(batch, i)
 	}
+	batch.Write()
+
 	// Clear out any stale content from the caches
 	hc.headerCache.Purge()
 	hc.tdCache.Purge()

ethdb/database.go

@@ -388,6 +388,12 @@ func (b *ldbBatch) Put(key, value []byte) error {
 	return nil
 }
 
+func (b *ldbBatch) Delete(key []byte) error {
+	b.b.Delete(key)
+	b.size += 1
+	return nil
+}
+
 func (b *ldbBatch) Write() error {
 	return b.db.Write(b.b, nil)
 }
@@ -453,6 +459,10 @@ func (tb *tableBatch) Put(key, value []byte) error {
 	return tb.batch.Put(append([]byte(tb.prefix), key...), value)
 }
 
+func (tb *tableBatch) Delete(key []byte) error {
+	return tb.batch.Delete(append([]byte(tb.prefix), key...))
+}
+
 func (tb *tableBatch) Write() error {
 	return tb.batch.Write()
 }

ethdb/interface.go

@@ -25,12 +25,17 @@ type Putter interface {
 	Put(key []byte, value []byte) error
 }
 
+// Deleter wraps the database delete operation supported by both batches and regular databases.
+type Deleter interface {
+	Delete(key []byte) error
+}
+
 // Database wraps all database operations. All methods are safe for concurrent use.
 type Database interface {
 	Putter
+	Deleter
 	Get(key []byte) ([]byte, error)
 	Has(key []byte) (bool, error)
-	Delete(key []byte) error
 	Close()
 	NewBatch() Batch
 }
@@ -39,6 +44,7 @@ type Database interface {
 // when Write is called. Batch cannot be used concurrently.
 type Batch interface {
 	Putter
+	Deleter
 	ValueSize() int // amount of data in the batch
 	Write() error
 	// Reset resets the batch for reuse

ethdb/memory_database.go

@@ -110,11 +110,20 @@ func (b *memBatch) Put(key, value []byte) error {
 	return nil
 }
 
+func (b *memBatch) Delete(key []byte) error {
+	b.writes = append(b.writes, kv{common.CopyBytes(key), nil})
+	return nil
+}
+
 func (b *memBatch) Write() error {
 	b.db.lock.Lock()
 	defer b.db.lock.Unlock()
 
 	for _, kv := range b.writes {
+		if kv.v == nil {
+			delete(b.db.db, string(kv.k))
+			continue
+		}
 		b.db.db[string(kv.k)] = kv.v
 	}
 	return nil

light/txpool.go

@@ -199,15 +199,17 @@ func (pool *TxPool) checkMinedTxs(ctx context.Context, hash common.Hash, number
 // rollbackTxs marks the transactions contained in recently rolled back blocks
 // as rolled back. It also removes any positional lookup entries.
 func (pool *TxPool) rollbackTxs(hash common.Hash, txc txStateChanges) {
+	batch := pool.chainDb.NewBatch()
 	if list, ok := pool.mined[hash]; ok {
 		for _, tx := range list {
 			txHash := tx.Hash()
-			rawdb.DeleteTxLookupEntry(pool.chainDb, txHash)
+			rawdb.DeleteTxLookupEntry(batch, txHash)
 			pool.pending[txHash] = tx
 			txc.setState(txHash, false)
 		}
 		delete(pool.mined, hash)
 	}
+	batch.Write()
 }
 
 // reorgOnNewHead sets a new head header, processing (and rolling back if necessary)
@@ -504,14 +506,16 @@ func (self *TxPool) Content() (map[common.Address]types.Transactions, map[common
 func (self *TxPool) RemoveTransactions(txs types.Transactions) {
 	self.mu.Lock()
 	defer self.mu.Unlock()
+
 	var hashes []common.Hash
+	batch := self.chainDb.NewBatch()
 	for _, tx := range txs {
-		//self.RemoveTx(tx.Hash())
 		hash := tx.Hash()
 		delete(self.pending, hash)
-		self.chainDb.Delete(hash[:])
+		batch.Delete(hash.Bytes())
 		hashes = append(hashes, hash)
 	}
+	batch.Write()
 	self.relay.Discard(hashes)
 }