core/state: access trie through Database interface, track errors (#14589)

With this commit, core/state's access to the underlying key/value database is
mediated through an interface. Database errors are tracked in StateDB and
returned by CommitTo or the new Error method.

Motivation for this change: We can remove the light client's duplicated copy of
core/state. The light client now supports node iteration, so tracing and storage
enumeration can work with the light client (not implemented in this commit).

1 files changed, 2 insertions, 4 deletions

diff --git a/eth/bind.go b/eth/bind.go
index e5abd8617..0385db1f9 100644
--- a/eth/bind.go
+++ b/eth/bind.go
@@ -54,14 +54,12 @@ func NewContractBackend(apiBackend ethapi.Backend) *ContractBackend {
 
 // CodeAt retrieves any code associated with the contract from the local API.
 func (b *ContractBackend) CodeAt(ctx context.Context, contract common.Address, blockNum *big.Int) ([]byte, error) {
-	out, err := b.bcapi.GetCode(ctx, contract, toBlockNumber(blockNum))
-	return common.FromHex(out), err
+	return b.bcapi.GetCode(ctx, contract, toBlockNumber(blockNum))
 }
 
 // CodeAt retrieves any code associated with the contract from the local API.
 func (b *ContractBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
-	out, err := b.bcapi.GetCode(ctx, contract, rpc.PendingBlockNumber)
-	return common.FromHex(out), err
+	return b.bcapi.GetCode(ctx, contract, rpc.PendingBlockNumber)
 }
 
 // ContractCall implements bind.ContractCaller executing an Ethereum contract