115 lines
4.6 KiB
Go
115 lines
4.6 KiB
Go
// Copyright 2016 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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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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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 *PublicEthereumAPI // Wrapper around the Ethereum object to access metadata
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bcapi *PublicBlockChainAPI // Wrapper around the blockchain to access chain data
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txapi *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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// Etheruem object.
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func NewContractBackend(eth *Ethereum) *ContractBackend {
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return &ContractBackend{
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eapi: NewPublicEthereumAPI(eth),
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bcapi: NewPublicBlockChainAPI(eth.chainConfig, eth.blockchain, eth.miner, eth.chainDb, eth.gpo, eth.eventMux, eth.accountManager),
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txapi: NewPublicTransactionPoolAPI(eth),
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}
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}
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// HasCode implements bind.ContractVerifier.HasCode by retrieving any code associated
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// with the contract from the local API, and checking its size.
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func (b *ContractBackend) HasCode(contract common.Address, pending bool) (bool, error) {
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block := rpc.LatestBlockNumber
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if pending {
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block = rpc.PendingBlockNumber
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}
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out, err := b.bcapi.GetCode(contract, block)
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return len(common.FromHex(out)) > 0, 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) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
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// Convert the input args to the API spec
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args := CallArgs{
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To: &contract,
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Data: common.ToHex(data),
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}
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block := rpc.LatestBlockNumber
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if pending {
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block = rpc.PendingBlockNumber
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}
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// Execute the call and convert the output back to Go types
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out, err := b.bcapi.Call(args, block)
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return common.FromHex(out), err
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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) PendingAccountNonce(account common.Address) (uint64, error) {
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out, err := b.txapi.GetTransactionCount(account, rpc.PendingBlockNumber)
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return out.Uint64(), 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() (*big.Int, error) {
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return b.eapi.GasPrice(), nil
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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) EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
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out, err := b.bcapi.EstimateGas(CallArgs{
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From: sender,
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To: contract,
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Value: *rpc.NewHexNumber(value),
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Data: common.ToHex(data),
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})
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return out.BigInt(), 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(tx *types.Transaction) error {
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raw, _ := rlp.EncodeToBytes(tx)
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_, err := b.txapi.SendRawTransaction(common.ToHex(raw))
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return err
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}
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