mobile: initial wrappers for mobile support
This commit is contained in:
Péter Szilágyi
305
mobile/ethclient.go
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305
mobile/ethclient.go
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// 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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// Contains a wrapper for the Ethereum client.
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package geth
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/ethclient"
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)
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// EthereumClient provides access to the Ethereum APIs.
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type EthereumClient struct {
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client *ethclient.Client
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}
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// NewEthereumClient connects a client to the given URL.
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func NewEthereumClient(rawurl string) (*EthereumClient, error) {
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client, err := ethclient.Dial(rawurl)
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return &EthereumClient{client}, err
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}
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// GetBlockByHash returns the given full block.
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func (ec *EthereumClient) GetBlockByHash(ctx *Context, hash *Hash) (*Block, error) {
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block, err := ec.client.BlockByHash(ctx.context, hash.hash)
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return &Block{block}, err
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}
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// GetBlockByNumber returns a block from the current canonical chain. If number is <0, the
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// latest known block is returned.
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func (ec *EthereumClient) GetBlockByNumber(ctx *Context, number int64) (*Block, error) {
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if number < 0 {
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block, err := ec.client.BlockByNumber(ctx.context, nil)
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return &Block{block}, err
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}
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block, err := ec.client.BlockByNumber(ctx.context, big.NewInt(number))
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return &Block{block}, err
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}
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// GetHeaderByHash returns the block header with the given hash.
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func (ec *EthereumClient) GetHeaderByHash(ctx *Context, hash *Hash) (*Header, error) {
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header, err := ec.client.HeaderByHash(ctx.context, hash.hash)
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return &Header{header}, err
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}
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// GetHeaderByNumber returns a block header from the current canonical chain. If number is <0,
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// the latest known header is returned.
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func (ec *EthereumClient) GetHeaderByNumber(ctx *Context, number int64) (*Header, error) {
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if number < 0 {
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header, err := ec.client.HeaderByNumber(ctx.context, nil)
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return &Header{header}, err
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}
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header, err := ec.client.HeaderByNumber(ctx.context, big.NewInt(number))
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return &Header{header}, err
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}
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// GetTransactionByHash returns the transaction with the given hash.
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func (ec *EthereumClient) GetTransactionByHash(ctx *Context, hash *Hash) (*Transaction, error) {
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tx, err := ec.client.TransactionByHash(ctx.context, hash.hash)
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return &Transaction{tx}, err
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}
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// GetTransactionCount returns the total number of transactions in the given block.
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func (ec *EthereumClient) GetTransactionCount(ctx *Context, hash *Hash) (int, error) {
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count, err := ec.client.TransactionCount(ctx.context, hash.hash)
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return int(count), err
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}
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// GetTransactionInBlock returns a single transaction at index in the given block.
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func (ec *EthereumClient) GetTransactionInBlock(ctx *Context, hash *Hash, index int) (*Transaction, error) {
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tx, err := ec.client.TransactionInBlock(ctx.context, hash.hash, uint(index))
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return &Transaction{tx}, err
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}
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// GetTransactionReceipt returns the receipt of a transaction by transaction hash.
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// Note that the receipt is not available for pending transactions.
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func (ec *EthereumClient) GetTransactionReceipt(ctx *Context, hash *Hash) (*Receipt, error) {
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receipt, err := ec.client.TransactionReceipt(ctx.context, hash.hash)
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return &Receipt{receipt}, err
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}
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// SyncProgress retrieves the current progress of the sync algorithm. If there's
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// no sync currently running, it returns nil.
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func (ec *EthereumClient) SyncProgress(ctx *Context) (*SyncProgress, error) {
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progress, err := ec.client.SyncProgress(ctx.context)
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if progress == nil {
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return nil, err
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}
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return &SyncProgress{*progress}, err
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}
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// NewHeadHandler is a client-side subscription callback to invoke on events and
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// subscription failure.
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type NewHeadHandler interface {
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OnNewHead(header *Header)
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OnError(failure string)
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}
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// SubscribeNewHead subscribes to notifications about the current blockchain head
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// on the given channel.
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func (ec *EthereumClient) SubscribeNewHead(ctx *Context, handler NewHeadHandler, buffer int) (*Subscription, error) {
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// Subscribe to the event internally
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ch := make(chan *types.Header, buffer)
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sub, err := ec.client.SubscribeNewHead(ctx.context, ch)
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if err != nil {
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return nil, err
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}
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// Start up a dispatcher to feed into the callback
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go func() {
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for {
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select {
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case header := <-ch:
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handler.OnNewHead(&Header{header})
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case err := <-sub.Err():
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handler.OnError(err.Error())
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return
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}
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}
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}()
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return &Subscription{sub}, nil
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}
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// State Access
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// GetBalanceAt returns the wei balance of the given account.
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// The block number can be <0, in which case the balance is taken from the latest known block.
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func (ec *EthereumClient) GetBalanceAt(ctx *Context, account *Address, number int64) (*BigInt, error) {
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if number < 0 {
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balance, err := ec.client.BalanceAt(ctx.context, account.address, nil)
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return &BigInt{balance}, err
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}
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balance, err := ec.client.BalanceAt(ctx.context, account.address, big.NewInt(number))
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return &BigInt{balance}, err
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}
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// GetStorageAt returns the value of key in the contract storage of the given account.
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// The block number can be <0, in which case the value is taken from the latest known block.
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func (ec *EthereumClient) GetStorageAt(ctx *Context, account *Address, key *Hash, number int64) ([]byte, error) {
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if number < 0 {
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return ec.client.StorageAt(ctx.context, account.address, key.hash, nil)
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}
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return ec.client.StorageAt(ctx.context, account.address, key.hash, big.NewInt(number))
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}
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// GetCodeAt returns the contract code of the given account.
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// The block number can be <0, in which case the code is taken from the latest known block.
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func (ec *EthereumClient) GetCodeAt(ctx *Context, account *Address, number int64) ([]byte, error) {
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if number < 0 {
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return ec.client.CodeAt(ctx.context, account.address, nil)
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}
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return ec.client.CodeAt(ctx.context, account.address, big.NewInt(number))
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}
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// GetNonceAt returns the account nonce of the given account.
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// The block number can be <0, in which case the nonce is taken from the latest known block.
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func (ec *EthereumClient) GetNonceAt(ctx *Context, account *Address, number int64) (int64, error) {
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if number < 0 {
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nonce, err := ec.client.NonceAt(ctx.context, account.address, nil)
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return int64(nonce), err
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}
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nonce, err := ec.client.NonceAt(ctx.context, account.address, big.NewInt(number))
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return int64(nonce), err
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}
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// Filters
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// FilterLogs executes a filter query.
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func (ec *EthereumClient) FilterLogs(ctx *Context, query *FilterQuery) (*Logs, error) {
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logs, err := ec.client.FilterLogs(ctx.context, query.query)
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if err != nil {
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return nil, err
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}
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// Temp hack due to vm.Logs being []*vm.Log
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res := make(vm.Logs, len(logs))
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for i, log := range logs {
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res[i] = &log
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}
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return &Logs{res}, nil
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}
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// FilterLogsHandler is a client-side subscription callback to invoke on events and
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// subscription failure.
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type FilterLogsHandler interface {
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OnFilterLogs(log *Log)
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OnError(failure string)
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}
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// SubscribeFilterLogs subscribes to the results of a streaming filter query.
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func (ec *EthereumClient) SubscribeFilterLogs(ctx *Context, query *FilterQuery, handler FilterLogsHandler, buffer int) (*Subscription, error) {
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// Subscribe to the event internally
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ch := make(chan vm.Log, buffer)
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sub, err := ec.client.SubscribeFilterLogs(ctx.context, query.query, ch)
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if err != nil {
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return nil, err
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}
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// Start up a dispatcher to feed into the callback
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go func() {
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for {
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select {
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case log := <-ch:
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handler.OnFilterLogs(&Log{&log})
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case err := <-sub.Err():
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handler.OnError(err.Error())
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return
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}
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}
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}()
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return &Subscription{sub}, nil
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}
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// Pending State
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// GetPendingBalanceAt returns the wei balance of the given account in the pending state.
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func (ec *EthereumClient) GetPendingBalanceAt(ctx *Context, account *Address) (*BigInt, error) {
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balance, err := ec.client.PendingBalanceAt(ctx.context, account.address)
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return &BigInt{balance}, err
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}
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// GetPendingStorageAt returns the value of key in the contract storage of the given account in the pending state.
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func (ec *EthereumClient) GetPendingStorageAt(ctx *Context, account *Address, key *Hash) ([]byte, error) {
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return ec.client.PendingStorageAt(ctx.context, account.address, key.hash)
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}
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// GetPendingCodeAt returns the contract code of the given account in the pending state.
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func (ec *EthereumClient) GetPendingCodeAt(ctx *Context, account *Address) ([]byte, error) {
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return ec.client.PendingCodeAt(ctx.context, account.address)
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}
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// GetPendingNonceAt returns the account nonce of the given account in the pending state.
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// This is the nonce that should be used for the next transaction.
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func (ec *EthereumClient) GetPendingNonceAt(ctx *Context, account *Address) (int64, error) {
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nonce, err := ec.client.PendingNonceAt(ctx.context, account.address)
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return int64(nonce), err
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}
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// GetPendingTransactionCount returns the total number of transactions in the pending state.
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func (ec *EthereumClient) GetPendingTransactionCount(ctx *Context) (int, error) {
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count, err := ec.client.PendingTransactionCount(ctx.context)
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return int(count), err
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}
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// Contract Calling
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// CallContract executes a message call transaction, which is directly executed in the VM
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// of the node, but never mined into the blockchain.
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//
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// blockNumber selects the block height at which the call runs. It can be <0, in which
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// case the code is taken from the latest known block. Note that state from very old
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// blocks might not be available.
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func (ec *EthereumClient) CallContract(ctx *Context, msg *CallMsg, number int64) ([]byte, error) {
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if number < 0 {
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return ec.client.CallContract(ctx.context, msg.msg, nil)
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}
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return ec.client.CallContract(ctx.context, msg.msg, big.NewInt(number))
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}
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// PendingCallContract executes a message call transaction using the EVM.
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// The state seen by the contract call is the pending state.
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func (ec *EthereumClient) PendingCallContract(ctx *Context, msg *CallMsg) ([]byte, error) {
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return ec.client.PendingCallContract(ctx.context, msg.msg)
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}
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// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
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// execution of a transaction.
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func (ec *EthereumClient) SuggestGasPrice(ctx *Context) (*BigInt, error) {
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price, err := ec.client.SuggestGasPrice(ctx.context)
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return &BigInt{price}, err
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}
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// EstimateGas tries to estimate the gas needed to execute a specific transaction based on
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// the current pending state of the backend blockchain. There is no guarantee that this is
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// the true gas limit requirement as other transactions may be added or removed by miners,
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// but it should provide a basis for setting a reasonable default.
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func (ec *EthereumClient) EstimateGas(ctx *Context, msg *CallMsg) (*BigInt, error) {
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price, err := ec.client.EstimateGas(ctx.context, msg.msg)
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return &BigInt{price}, err
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}
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// SendTransaction injects a signed transaction into the pending pool for execution.
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//
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// If the transaction was a contract creation use the TransactionReceipt method to get the
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// contract address after the transaction has been mined.
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func (ec *EthereumClient) SendTransaction(ctx *Context, tx *Transaction) error {
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return ec.client.SendTransaction(ctx.context, tx.tx)
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}
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