mobile: initial wrappers for mobile support

1 files changed, 305 insertions, 0 deletions

diff --git a/mobile/ethclient.go b/mobile/ethclient.go
new file mode 100644
index 000000000..668d65e32
--- /dev/null
+++ b/mobile/ethclient.go
@@ -0,0 +1,305 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// 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.
+//
+// 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 Lesser General Public License for more details.
+//
+// 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/>.
+
+// Contains a wrapper for the Ethereum client.
+
+package geth
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/ethclient"
+)
+
+// EthereumClient provides access to the Ethereum APIs.
+type EthereumClient struct {
+	client *ethclient.Client
+}
+
+// NewEthereumClient connects a client to the given URL.
+func NewEthereumClient(rawurl string) (*EthereumClient, error) {
+	client, err := ethclient.Dial(rawurl)
+	return &EthereumClient{client}, err
+}
+
+// GetBlockByHash returns the given full block.
+func (ec *EthereumClient) GetBlockByHash(ctx *Context, hash *Hash) (*Block, error) {
+	block, err := ec.client.BlockByHash(ctx.context, hash.hash)
+	return &Block{block}, err
+}
+
+// GetBlockByNumber returns a block from the current canonical chain. If number is <0, the
+// latest known block is returned.
+func (ec *EthereumClient) GetBlockByNumber(ctx *Context, number int64) (*Block, error) {
+	if number < 0 {
+		block, err := ec.client.BlockByNumber(ctx.context, nil)
+		return &Block{block}, err
+	}
+	block, err := ec.client.BlockByNumber(ctx.context, big.NewInt(number))
+	return &Block{block}, err
+}
+
+// GetHeaderByHash returns the block header with the given hash.
+func (ec *EthereumClient) GetHeaderByHash(ctx *Context, hash *Hash) (*Header, error) {
+	header, err := ec.client.HeaderByHash(ctx.context, hash.hash)
+	return &Header{header}, err
+}
+
+// GetHeaderByNumber returns a block header from the current canonical chain. If number is <0,
+// the latest known header is returned.
+func (ec *EthereumClient) GetHeaderByNumber(ctx *Context, number int64) (*Header, error) {
+	if number < 0 {
+		header, err := ec.client.HeaderByNumber(ctx.context, nil)
+		return &Header{header}, err
+	}
+	header, err := ec.client.HeaderByNumber(ctx.context, big.NewInt(number))
+	return &Header{header}, err
+}
+
+// GetTransactionByHash returns the transaction with the given hash.
+func (ec *EthereumClient) GetTransactionByHash(ctx *Context, hash *Hash) (*Transaction, error) {
+	tx, err := ec.client.TransactionByHash(ctx.context, hash.hash)
+	return &Transaction{tx}, err
+}
+
+// GetTransactionCount returns the total number of transactions in the given block.
+func (ec *EthereumClient) GetTransactionCount(ctx *Context, hash *Hash) (int, error) {
+	count, err := ec.client.TransactionCount(ctx.context, hash.hash)
+	return int(count), err
+}
+
+// GetTransactionInBlock returns a single transaction at index in the given block.
+func (ec *EthereumClient) GetTransactionInBlock(ctx *Context, hash *Hash, index int) (*Transaction, error) {
+	tx, err := ec.client.TransactionInBlock(ctx.context, hash.hash, uint(index))
+	return &Transaction{tx}, err
+
+}
+
+// GetTransactionReceipt returns the receipt of a transaction by transaction hash.
+// Note that the receipt is not available for pending transactions.
+func (ec *EthereumClient) GetTransactionReceipt(ctx *Context, hash *Hash) (*Receipt, error) {
+	receipt, err := ec.client.TransactionReceipt(ctx.context, hash.hash)
+	return &Receipt{receipt}, err
+}
+
+// SyncProgress retrieves the current progress of the sync algorithm. If there's
+// no sync currently running, it returns nil.
+func (ec *EthereumClient) SyncProgress(ctx *Context) (*SyncProgress, error) {
+	progress, err := ec.client.SyncProgress(ctx.context)
+	if progress == nil {
+		return nil, err
+	}
+	return &SyncProgress{*progress}, err
+}
+
+// NewHeadHandler is a client-side subscription callback to invoke on events and
+// subscription failure.
+type NewHeadHandler interface {
+	OnNewHead(header *Header)
+	OnError(failure string)
+}
+
+// SubscribeNewHead subscribes to notifications about the current blockchain head
+// on the given channel.
+func (ec *EthereumClient) SubscribeNewHead(ctx *Context, handler NewHeadHandler, buffer int) (*Subscription, error) {
+	// Subscribe to the event internally
+	ch := make(chan *types.Header, buffer)
+	sub, err := ec.client.SubscribeNewHead(ctx.context, ch)
+	if err != nil {
+		return nil, err
+	}
+	// Start up a dispatcher to feed into the callback
+	go func() {
+		for {
+			select {
+			case header := <-ch:
+				handler.OnNewHead(&Header{header})
+
+			case err := <-sub.Err():
+				handler.OnError(err.Error())
+				return
+			}
+		}
+	}()
+	return &Subscription{sub}, nil
+}
+
+// State Access
+
+// GetBalanceAt returns the wei balance of the given account.
+// The block number can be <0, in which case the balance is taken from the latest known block.
+func (ec *EthereumClient) GetBalanceAt(ctx *Context, account *Address, number int64) (*BigInt, error) {
+	if number < 0 {
+		balance, err := ec.client.BalanceAt(ctx.context, account.address, nil)
+		return &BigInt{balance}, err
+	}
+	balance, err := ec.client.BalanceAt(ctx.context, account.address, big.NewInt(number))
+	return &BigInt{balance}, err
+}
+
+// GetStorageAt returns the value of key in the contract storage of the given account.
+// The block number can be <0, in which case the value is taken from the latest known block.
+func (ec *EthereumClient) GetStorageAt(ctx *Context, account *Address, key *Hash, number int64) ([]byte, error) {
+	if number < 0 {
+		return ec.client.StorageAt(ctx.context, account.address, key.hash, nil)
+	}
+	return ec.client.StorageAt(ctx.context, account.address, key.hash, big.NewInt(number))
+}
+
+// GetCodeAt returns the contract code of the given account.
+// The block number can be <0, in which case the code is taken from the latest known block.
+func (ec *EthereumClient) GetCodeAt(ctx *Context, account *Address, number int64) ([]byte, error) {
+	if number < 0 {
+		return ec.client.CodeAt(ctx.context, account.address, nil)
+	}
+	return ec.client.CodeAt(ctx.context, account.address, big.NewInt(number))
+}
+
+// GetNonceAt returns the account nonce of the given account.
+// The block number can be <0, in which case the nonce is taken from the latest known block.
+func (ec *EthereumClient) GetNonceAt(ctx *Context, account *Address, number int64) (int64, error) {
+	if number < 0 {
+		nonce, err := ec.client.NonceAt(ctx.context, account.address, nil)
+		return int64(nonce), err
+	}
+	nonce, err := ec.client.NonceAt(ctx.context, account.address, big.NewInt(number))
+	return int64(nonce), err
+}
+
+// Filters
+
+// FilterLogs executes a filter query.
+func (ec *EthereumClient) FilterLogs(ctx *Context, query *FilterQuery) (*Logs, error) {
+	logs, err := ec.client.FilterLogs(ctx.context, query.query)
+	if err != nil {
+		return nil, err
+	}
+	// Temp hack due to vm.Logs being []*vm.Log
+	res := make(vm.Logs, len(logs))
+	for i, log := range logs {
+		res[i] = &log
+	}
+	return &Logs{res}, nil
+}
+
+// FilterLogsHandler is a client-side subscription callback to invoke on events and
+// subscription failure.
+type FilterLogsHandler interface {
+	OnFilterLogs(log *Log)
+	OnError(failure string)
+}
+
+// SubscribeFilterLogs subscribes to the results of a streaming filter query.
+func (ec *EthereumClient) SubscribeFilterLogs(ctx *Context, query *FilterQuery, handler FilterLogsHandler, buffer int) (*Subscription, error) {
+	// Subscribe to the event internally
+	ch := make(chan vm.Log, buffer)
+	sub, err := ec.client.SubscribeFilterLogs(ctx.context, query.query, ch)
+	if err != nil {
+		return nil, err
+	}
+	// Start up a dispatcher to feed into the callback
+	go func() {
+		for {
+			select {
+			case log := <-ch:
+				handler.OnFilterLogs(&Log{&log})
+
+			case err := <-sub.Err():
+				handler.OnError(err.Error())
+				return
+			}
+		}
+	}()
+	return &Subscription{sub}, nil
+}
+
+// Pending State
+
+// GetPendingBalanceAt returns the wei balance of the given account in the pending state.
+func (ec *EthereumClient) GetPendingBalanceAt(ctx *Context, account *Address) (*BigInt, error) {
+	balance, err := ec.client.PendingBalanceAt(ctx.context, account.address)
+	return &BigInt{balance}, err
+}
+
+// GetPendingStorageAt returns the value of key in the contract storage of the given account in the pending state.
+func (ec *EthereumClient) GetPendingStorageAt(ctx *Context, account *Address, key *Hash) ([]byte, error) {
+	return ec.client.PendingStorageAt(ctx.context, account.address, key.hash)
+}
+
+// GetPendingCodeAt returns the contract code of the given account in the pending state.
+func (ec *EthereumClient) GetPendingCodeAt(ctx *Context, account *Address) ([]byte, error) {
+	return ec.client.PendingCodeAt(ctx.context, account.address)
+}
+
+// GetPendingNonceAt returns the account nonce of the given account in the pending state.
+// This is the nonce that should be used for the next transaction.
+func (ec *EthereumClient) GetPendingNonceAt(ctx *Context, account *Address) (int64, error) {
+	nonce, err := ec.client.PendingNonceAt(ctx.context, account.address)
+	return int64(nonce), err
+}
+
+// GetPendingTransactionCount returns the total number of transactions in the pending state.
+func (ec *EthereumClient) GetPendingTransactionCount(ctx *Context) (int, error) {
+	count, err := ec.client.PendingTransactionCount(ctx.context)
+	return int(count), err
+}
+
+// Contract Calling
+
+// CallContract executes a message call transaction, which is directly executed in the VM
+// of the node, but never mined into the blockchain.
+//
+// blockNumber selects the block height at which the call runs. It can be <0, in which
+// case the code is taken from the latest known block. Note that state from very old
+// blocks might not be available.
+func (ec *EthereumClient) CallContract(ctx *Context, msg *CallMsg, number int64) ([]byte, error) {
+	if number < 0 {
+		return ec.client.CallContract(ctx.context, msg.msg, nil)
+	}
+	return ec.client.CallContract(ctx.context, msg.msg, big.NewInt(number))
+}
+
+// PendingCallContract executes a message call transaction using the EVM.
+// The state seen by the contract call is the pending state.
+func (ec *EthereumClient) PendingCallContract(ctx *Context, msg *CallMsg) ([]byte, error) {
+	return ec.client.PendingCallContract(ctx.context, msg.msg)
+}
+
+// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
+// execution of a transaction.
+func (ec *EthereumClient) SuggestGasPrice(ctx *Context) (*BigInt, error) {
+	price, err := ec.client.SuggestGasPrice(ctx.context)
+	return &BigInt{price}, err
+}
+
+// EstimateGas tries to estimate the gas needed to execute a specific transaction based on
+// the current pending state of the backend blockchain. There is no guarantee that this is
+// the true gas limit requirement as other transactions may be added or removed by miners,
+// but it should provide a basis for setting a reasonable default.
+func (ec *EthereumClient) EstimateGas(ctx *Context, msg *CallMsg) (*BigInt, error) {
+	price, err := ec.client.EstimateGas(ctx.context, msg.msg)
+	return &BigInt{price}, err
+}
+
+// SendTransaction injects a signed transaction into the pending pool for execution.
+//
+// If the transaction was a contract creation use the TransactionReceipt method to get the
+// contract address after the transaction has been mined.
+func (ec *EthereumClient) SendTransaction(ctx *Context, tx *Transaction) error {
+	return ec.client.SendTransaction(ctx.context, tx.tx)
+}