137 lines
5.5 KiB
Go
137 lines
5.5 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"context"
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"math/big"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// ContractBackend implements bind.ContractBackend with direct calls to Ethereum
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// internals to support operating on contracts within subprotocols like eth and
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// swarm.
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//
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// Internally this backend uses the already exposed API endpoints of the Ethereum
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// object. These should be rewritten to internal Go method calls when the Go API
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// is refactored to support a clean library use.
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type ContractBackend struct {
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eapi *ethapi.PublicEthereumAPI // Wrapper around the Ethereum object to access metadata
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bcapi *ethapi.PublicBlockChainAPI // Wrapper around the blockchain to access chain data
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txapi *ethapi.PublicTransactionPoolAPI // Wrapper around the transaction pool to access transaction data
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}
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// NewContractBackend creates a new native contract backend using an existing
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// Ethereum object.
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func NewContractBackend(apiBackend ethapi.Backend) *ContractBackend {
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return &ContractBackend{
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eapi: ethapi.NewPublicEthereumAPI(apiBackend),
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bcapi: ethapi.NewPublicBlockChainAPI(apiBackend),
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txapi: ethapi.NewPublicTransactionPoolAPI(apiBackend, new(ethapi.AddrLocker)),
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}
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}
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// CodeAt retrieves any code associated with the contract from the local API.
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func (b *ContractBackend) CodeAt(ctx context.Context, contract common.Address, blockNum *big.Int) ([]byte, error) {
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return b.bcapi.GetCode(ctx, contract, toBlockNumber(blockNum))
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}
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// CodeAt retrieves any code associated with the contract from the local API.
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func (b *ContractBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
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return b.bcapi.GetCode(ctx, contract, rpc.PendingBlockNumber)
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}
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// ContractCall implements bind.ContractCaller executing an Ethereum contract
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// call with the specified data as the input. The pending flag requests execution
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// against the pending block, not the stable head of the chain.
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func (b *ContractBackend) CallContract(ctx context.Context, msg ethereum.CallMsg, blockNum *big.Int) ([]byte, error) {
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out, err := b.bcapi.Call(ctx, toCallArgs(msg), toBlockNumber(blockNum))
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return out, err
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}
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// ContractCall implements bind.ContractCaller executing an Ethereum contract
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// call with the specified data as the input. The pending flag requests execution
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// against the pending block, not the stable head of the chain.
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func (b *ContractBackend) PendingCallContract(ctx context.Context, msg ethereum.CallMsg) ([]byte, error) {
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out, err := b.bcapi.Call(ctx, toCallArgs(msg), rpc.PendingBlockNumber)
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return out, err
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}
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func toCallArgs(msg ethereum.CallMsg) ethapi.CallArgs {
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args := ethapi.CallArgs{
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To: msg.To,
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From: msg.From,
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Data: msg.Data,
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Gas: hexutil.Uint64(msg.Gas),
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}
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if msg.GasPrice != nil {
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args.GasPrice = hexutil.Big(*msg.GasPrice)
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}
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if msg.Value != nil {
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args.Value = hexutil.Big(*msg.Value)
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}
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return args
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}
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func toBlockNumber(num *big.Int) rpc.BlockNumber {
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if num == nil {
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return rpc.LatestBlockNumber
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}
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return rpc.BlockNumber(num.Int64())
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}
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// PendingAccountNonce implements bind.ContractTransactor retrieving the current
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// pending nonce associated with an account.
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func (b *ContractBackend) PendingNonceAt(ctx context.Context, account common.Address) (nonce uint64, err error) {
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out, err := b.txapi.GetTransactionCount(ctx, account, rpc.PendingBlockNumber)
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if out != nil {
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nonce = uint64(*out)
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}
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return nonce, err
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}
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// SuggestGasPrice implements bind.ContractTransactor retrieving the currently
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// suggested gas price to allow a timely execution of a transaction.
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func (b *ContractBackend) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
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return b.eapi.GasPrice(ctx)
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}
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// EstimateGasLimit implements bind.ContractTransactor triing to estimate the gas
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// needed to execute a specific transaction based on the current pending state of
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// the backend blockchain. There is no guarantee that this is the true gas limit
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// requirement as other transactions may be added or removed by miners, but it
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// should provide a basis for setting a reasonable default.
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func (b *ContractBackend) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) {
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gas, err := b.bcapi.EstimateGas(ctx, toCallArgs(msg))
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return uint64(gas), err
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}
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// SendTransaction implements bind.ContractTransactor injects the transaction
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// into the pending pool for execution.
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func (b *ContractBackend) SendTransaction(ctx context.Context, tx *types.Transaction) error {
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raw, _ := rlp.EncodeToBytes(tx)
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_, err := b.txapi.SendRawTransaction(ctx, raw)
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return err
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}
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