Merge pull request #3232 from zsfelfoldi/light-topic3

1 files changed, 15 insertions, 15 deletions

diff --git a/eth/api_backend.go b/eth/api_backend.go
index 42b84bf9b..efe9a7a01 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -1,18 +1,18 @@
 // Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
+// This file is part of the go-ethereum library.
 //
-// go-ethereum is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
+// 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.
 //
-// go-ethereum is distributed in the hope that it will be useful,
+// 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 General Public License for more details.
+// GNU Lesser General Public License for more details.
 //
-// You should have received a copy of the GNU General Public License
-// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+// 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 eth
 
@@ -44,17 +44,17 @@ func (b *EthApiBackend) SetHead(number uint64) {
 	b.eth.blockchain.SetHead(number)
 }
 
-func (b *EthApiBackend) HeaderByNumber(blockNr rpc.BlockNumber) *types.Header {
+func (b *EthApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
 	// Pending block is only known by the miner
 	if blockNr == rpc.PendingBlockNumber {
 		block, _ := b.eth.miner.Pending()
-		return block.Header()
+		return block.Header(), nil
 	}
 	// Otherwise resolve and return the block
 	if blockNr == rpc.LatestBlockNumber {
-		return b.eth.blockchain.CurrentBlock().Header()
+		return b.eth.blockchain.CurrentBlock().Header(), nil
 	}
-	return b.eth.blockchain.GetHeaderByNumber(uint64(blockNr))
+	return b.eth.blockchain.GetHeaderByNumber(uint64(blockNr)), nil
 }
 
 func (b *EthApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
@@ -70,16 +70,16 @@ func (b *EthApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumb
 	return b.eth.blockchain.GetBlockByNumber(uint64(blockNr)), nil
 }
 
-func (b *EthApiBackend) StateAndHeaderByNumber(blockNr rpc.BlockNumber) (ethapi.State, *types.Header, error) {
+func (b *EthApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (ethapi.State, *types.Header, error) {
 	// Pending state is only known by the miner
 	if blockNr == rpc.PendingBlockNumber {
 		block, state := b.eth.miner.Pending()
 		return EthApiState{state}, block.Header(), nil
 	}
 	// Otherwise resolve the block number and return its state
-	header := b.HeaderByNumber(blockNr)
-	if header == nil {
-		return nil, nil, nil
+	header, err := b.HeaderByNumber(ctx, blockNr)
+	if header == nil || err != nil {
+		return nil, nil, err
 	}
 	stateDb, err := b.eth.BlockChain().StateAt(header.Root)
 	return EthApiState{stateDb}, header, err