327 lines
8.6 KiB
JavaScript
327 lines
8.6 KiB
JavaScript
// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// Parity 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 General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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import Abi from '../../abi';
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import Api from '../api';
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import { isInstanceOf } from '../util/types';
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let nextSubscriptionId = 0;
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export default class Contract {
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constructor (api, abi) {
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if (!isInstanceOf(api, Api)) {
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throw new Error('API instance needs to be provided to Contract');
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} else if (!abi) {
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throw new Error('ABI needs to be provided to Contract instance');
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}
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this._api = api;
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this._abi = new Abi(abi);
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this._subscriptions = {};
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this._constructors = this._abi.constructors.map(this._bindFunction);
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this._functions = this._abi.functions.map(this._bindFunction);
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this._events = this._abi.events.map(this._bindEvent);
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this._instance = {};
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this._events.forEach((evt) => {
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this._instance[evt.name] = evt;
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this._instance[evt.signature] = evt;
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});
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this._functions.forEach((fn) => {
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this._instance[fn.name] = fn;
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this._instance[fn.signature] = fn;
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});
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this._sendSubscriptionChanges();
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}
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get address () {
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return this._address;
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}
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get constructors () {
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return this._constructors;
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}
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get events () {
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return this._events;
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}
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get functions () {
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return this._functions;
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}
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get instance () {
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this._instance.address = this._address;
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return this._instance;
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}
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get api () {
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return this._api;
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}
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get abi () {
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return this._abi;
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}
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at (address) {
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this._address = address;
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return this;
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}
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deploy (options, values, statecb) {
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let gas;
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const setState = (state) => {
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if (!statecb) {
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return;
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}
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return statecb(null, state);
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};
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setState({ state: 'estimateGas' });
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return this._api.eth
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.estimateGas(this._encodeOptions(this.constructors[0], options, values))
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.then((_gas) => {
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gas = _gas.mul(1.2);
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options.gas = gas.toFixed(0);
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setState({ state: 'postTransaction', gas });
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return this._api.parity.postTransaction(this._encodeOptions(this.constructors[0], options, values));
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})
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.then((requestId) => {
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setState({ state: 'checkRequest', requestId });
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return this._pollCheckRequest(requestId);
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})
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.then((txhash) => {
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setState({ state: 'getTransactionReceipt', txhash });
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return this._pollTransactionReceipt(txhash, gas);
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})
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.then((receipt) => {
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if (receipt.gasUsed.eq(gas)) {
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throw new Error(`Contract not deployed, gasUsed == ${gas.toFixed(0)}`);
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}
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setState({ state: 'hasReceipt', receipt });
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this._address = receipt.contractAddress;
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return this._address;
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})
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.then((address) => {
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setState({ state: 'getCode' });
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return this._api.eth.getCode(this._address);
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})
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.then((code) => {
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if (code === '0x') {
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throw new Error('Contract not deployed, getCode returned 0x');
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}
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setState({ state: 'completed' });
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return this._address;
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});
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}
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parseEventLogs (logs) {
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return logs
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.map((log) => {
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const signature = log.topics[0].substr(2);
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const event = this.events.find((evt) => evt.signature === signature);
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if (!event) {
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console.warn(`Unable to find event matching signature ${signature}`);
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return null;
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}
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const decoded = event.decodeLog(log.topics, log.data);
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log.params = {};
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log.event = event.name;
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decoded.params.forEach((param) => {
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const { type, value } = param.token;
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log.params[param.name] = { type, value };
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});
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return log;
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})
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.filter((log) => log);
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}
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parseTransactionEvents (receipt) {
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receipt.logs = this.parseEventLogs(receipt.logs);
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return receipt;
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}
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_pollCheckRequest = (requestId) => {
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return this._api.pollMethod('parity_checkRequest', requestId);
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}
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_pollTransactionReceipt = (txhash, gas) => {
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return this.api.pollMethod('eth_getTransactionReceipt', txhash, (receipt) => {
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if (!receipt || !receipt.blockNumber || receipt.blockNumber.eq(0)) {
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return false;
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}
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return true;
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});
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}
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_encodeOptions (func, options, values) {
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const tokens = func ? this._abi.encodeTokens(func.inputParamTypes(), values) : null;
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const call = tokens ? func.encodeCall(tokens) : null;
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if (options.data && options.data.substr(0, 2) === '0x') {
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options.data = options.data.substr(2);
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}
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options.data = `0x${options.data || ''}${call || ''}`;
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return options;
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}
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_addOptionsTo (options = {}) {
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return Object.assign({
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to: this._address
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}, options);
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}
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_bindFunction = (func) => {
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func.call = (options, values = []) => {
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return this._api.eth
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.call(this._encodeOptions(func, this._addOptionsTo(options), values))
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.then((encoded) => func.decodeOutput(encoded))
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.then((tokens) => tokens.map((token) => token.value))
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.then((returns) => returns.length === 1 ? returns[0] : returns);
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};
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if (!func.constant) {
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func.postTransaction = (options, values = []) => {
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return this._api.parity
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.postTransaction(this._encodeOptions(func, this._addOptionsTo(options), values));
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};
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func.estimateGas = (options, values = []) => {
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return this._api.eth
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.estimateGas(this._encodeOptions(func, this._addOptionsTo(options), values));
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};
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}
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return func;
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}
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_bindEvent = (event) => {
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event.subscribe = (options = {}, callback) => {
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return this._subscribe(event, options, callback);
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};
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event.unsubscribe = (subscriptionId) => {
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return this.unsubscribe(subscriptionId);
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};
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return event;
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}
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subscribe (eventName = null, options = {}, callback) {
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return new Promise((resolve, reject) => {
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let event = null;
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if (eventName) {
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event = this._events.find((evt) => evt.name === eventName);
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if (!event) {
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const events = this._events.map((evt) => evt.name).join(', ');
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reject(new Error(`${eventName} is not a valid eventName, subscribe using one of ${events} (or null to include all)`));
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return;
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}
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}
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return this._subscribe(event, options, callback).then(resolve).catch(reject);
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});
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}
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_subscribe (event = null, _options, callback) {
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const subscriptionId = nextSubscriptionId++;
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const options = Object.assign({}, _options, {
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address: this._address,
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topics: [event ? event.signature : null]
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});
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return this._api.eth
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.newFilter(options)
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.then((filterId) => {
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return this._api.eth
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.getFilterLogs(filterId)
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.then((logs) => {
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callback(null, this.parseEventLogs(logs));
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this._subscriptions[subscriptionId] = {
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options,
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callback,
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filterId
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};
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return subscriptionId;
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});
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});
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}
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unsubscribe (subscriptionId) {
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return this._api.eth
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.uninstallFilter(this._subscriptions[subscriptionId].filterId)
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.then(() => {
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delete this._subscriptions[subscriptionId];
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})
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.catch((error) => {
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console.error('unsubscribe', error);
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});
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}
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_sendSubscriptionChanges = () => {
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const subscriptions = Object.values(this._subscriptions);
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const timeout = () => setTimeout(this._sendSubscriptionChanges, 1000);
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Promise
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.all(
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subscriptions.map((subscription) => {
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return this._api.eth.getFilterChanges(subscription.filterId);
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})
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)
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.then((logsArray) => {
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logsArray.forEach((logs, idx) => {
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if (!logs || !logs.length) {
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return;
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}
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try {
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subscriptions[idx].callback(null, this.parseEventLogs(logs));
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} catch (error) {
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console.error('_sendSubscriptionChanges', error);
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}
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});
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timeout();
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})
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.catch((error) => {
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console.error('_sendSubscriptionChanges', error);
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timeout();
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});
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}
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}
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