core, eth, miner, xeth: receipt storage fix

* Added GetReceiptsFromBlock, GetReceipt, PutReceipts
* Added ContractAddress to receipt. See #1042

core/transaction_util.go

@@ -8,6 +8,9 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
+var receiptsPre = []byte("receipts-")
+
+// PutTransactions stores the transactions in the given database
 func PutTransactions(db common.Database, block *types.Block, txs types.Transactions) {
 	for i, tx := range block.Transactions() {
 		rlpEnc, err := rlp.EncodeToBytes(tx)
@@ -34,18 +37,49 @@ func PutTransactions(db common.Database, block *types.Block, txs types.Transacti
 	}
 }
 
-func PutReceipts(db common.Database, hash common.Hash, receipts types.Receipts) error {
-	storageReceipts := make([]*types.ReceiptForStorage, len(receipts))
-	for i, receipt := range receipts {
-		storageReceipts[i] = (*types.ReceiptForStorage)(receipt)
+// PutReceipts stores the receipts in the current database
+func PutReceipts(db common.Database, receipts types.Receipts) error {
+	for _, receipt := range receipts {
+		storageReceipt := (*types.ReceiptForStorage)(receipt)
+		bytes, err := rlp.EncodeToBytes(storageReceipt)
+		if err != nil {
+			return err
+		}
+		err = db.Put(append(receiptsPre, receipt.TxHash[:]...), bytes)
+		if err != nil {
+			return err
+		}
 	}
 
-	bytes, err := rlp.EncodeToBytes(storageReceipts)
-	if err != nil {
-		return err
-	}
-
-	db.Put(append(receiptsPre, hash[:]...), bytes)
-
 	return nil
 }
+
+// GetReceipt returns a receipt by hash
+func GetReceipt(db common.Database, txHash common.Hash) *types.Receipt {
+	data, _ := db.Get(append(receiptsPre, txHash[:]...))
+	if len(data) == 0 {
+		return nil
+	}
+
+	var receipt types.Receipt
+	err := rlp.DecodeBytes(data, &receipt)
+	if err != nil {
+		glog.V(logger.Error).Infoln("GetReceipt err:", err)
+	}
+	return &receipt
+}
+
+// GetReceiptFromBlock returns all receipts with the given block
+func GetReceiptsFromBlock(db common.Database, block *types.Block) types.Receipts {
+	// at some point we want:
+	//receipts := make(types.Receipts, len(block.Transactions()))
+	// but since we need to support legacy, we can't (yet)
+	var receipts types.Receipts
+	for _, tx := range block.Transactions() {
+		if receipt := GetReceipt(db, tx.Hash()); receipt != nil {
+			receipts = append(receipts, receipt)
+		}
+	}
+
+	return receipts
+}