458 lines
14 KiB
JavaScript
458 lines
14 KiB
JavaScript
/*
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This file is part of ethereum.js.
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ethereum.js 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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ethereum.js 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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You should have received a copy of the GNU Lesser General Public License
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along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file main.js
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* @authors:
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* Jeffrey Wilcke <jeff@ethdev.com>
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* Marek Kotewicz <marek@ethdev.com>
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* Marian Oancea <marian@ethdev.com>
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* @date 2014
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*/
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function isPromise(o) {
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return o instanceof Promise;
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}
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function flattenPromise (obj) {
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if (obj instanceof Promise) {
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return Promise.resolve(obj);
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}
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if (obj instanceof Array) {
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return new Promise(function (resolve) {
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var promises = obj.map(function (o) {
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return flattenPromise(o);
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});
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return Promise.all(promises).then(function (res) {
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for (var i = 0; i < obj.length; i++) {
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obj[i] = res[i];
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}
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resolve(obj);
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});
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});
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}
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if (obj instanceof Object) {
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return new Promise(function (resolve) {
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var keys = Object.keys(obj);
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var promises = keys.map(function (key) {
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return flattenPromise(obj[key]);
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});
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return Promise.all(promises).then(function (res) {
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for (var i = 0; i < keys.length; i++) {
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obj[keys[i]] = res[i];
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}
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resolve(obj);
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});
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});
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}
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return Promise.resolve(obj);
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}
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var ethMethods = function () {
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var blockCall = function (args) {
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return typeof args[0] === "string" ? "blockByHash" : "blockByNumber";
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};
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var transactionCall = function (args) {
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return typeof args[0] === "string" ? 'transactionByHash' : 'transactionByNumber';
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};
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var uncleCall = function (args) {
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return typeof args[0] === "string" ? 'uncleByHash' : 'uncleByNumber';
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};
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var methods = [
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{ name: 'balanceAt', call: 'balanceAt' },
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{ name: 'stateAt', call: 'stateAt' },
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{ name: 'countAt', call: 'countAt'},
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{ name: 'codeAt', call: 'codeAt' },
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{ name: 'transact', call: 'transact' },
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{ name: 'call', call: 'call' },
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{ name: 'block', call: blockCall },
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{ name: 'transaction', call: transactionCall },
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{ name: 'uncle', call: uncleCall },
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{ name: 'compile', call: 'compile' }
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];
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return methods;
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};
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var ethProperties = function () {
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return [
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{ name: 'coinbase', getter: 'coinbase', setter: 'setCoinbase' },
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{ name: 'listening', getter: 'listening', setter: 'setListening' },
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{ name: 'mining', getter: 'mining', setter: 'setMining' },
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{ name: 'gasPrice', getter: 'gasPrice' },
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{ name: 'account', getter: 'account' },
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{ name: 'accounts', getter: 'accounts' },
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{ name: 'peerCount', getter: 'peerCount' },
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{ name: 'defaultBlock', getter: 'defaultBlock', setter: 'setDefaultBlock' },
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{ name: 'number', getter: 'number'}
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];
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};
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var dbMethods = function () {
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return [
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{ name: 'put', call: 'put' },
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{ name: 'get', call: 'get' },
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{ name: 'putString', call: 'putString' },
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{ name: 'getString', call: 'getString' }
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];
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};
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var shhMethods = function () {
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return [
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{ name: 'post', call: 'post' },
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{ name: 'newIdentity', call: 'newIdentity' },
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{ name: 'haveIdentity', call: 'haveIdentity' },
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{ name: 'newGroup', call: 'newGroup' },
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{ name: 'addToGroup', call: 'addToGroup' }
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];
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};
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var ethWatchMethods = function () {
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var newFilter = function (args) {
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return typeof args[0] === 'string' ? 'newFilterString' : 'newFilter';
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};
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return [
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{ name: 'newFilter', call: newFilter },
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{ name: 'uninstallFilter', call: 'uninstallFilter' },
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{ name: 'getMessages', call: 'getMessages' }
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];
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};
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var shhWatchMethods = function () {
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return [
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{ name: 'newFilter', call: 'shhNewFilter' },
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{ name: 'uninstallFilter', call: 'shhUninstallFilter' },
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{ name: 'getMessage', call: 'shhGetMessages' }
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];
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};
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var setupMethods = function (obj, methods) {
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methods.forEach(function (method) {
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obj[method.name] = function () {
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return flattenPromise(Array.prototype.slice.call(arguments)).then(function (args) {
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var call = typeof method.call === "function" ? method.call(args) : method.call;
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return {call: call, args: args};
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}).then(function (request) {
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return new Promise(function (resolve, reject) {
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web3.provider.send(request, function (err, result) {
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if (!err) {
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resolve(result);
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return;
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}
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reject(err);
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});
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});
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}).catch(function(err) {
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console.error(err);
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});
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};
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});
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};
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var setupProperties = function (obj, properties) {
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properties.forEach(function (property) {
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var proto = {};
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proto.get = function () {
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return new Promise(function(resolve, reject) {
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web3.provider.send({call: property.getter}, function(err, result) {
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if (!err) {
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resolve(result);
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return;
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}
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reject(err);
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});
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});
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};
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if (property.setter) {
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proto.set = function (val) {
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return flattenPromise([val]).then(function (args) {
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return new Promise(function (resolve) {
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web3.provider.send({call: property.setter, args: args}, function (err, result) {
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if (!err) {
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resolve(result);
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return;
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}
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reject(err);
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});
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});
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}).catch(function (err) {
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console.error(err);
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});
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};
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}
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Object.defineProperty(obj, property.name, proto);
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});
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};
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var web3 = {
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_callbacks: {},
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_events: {},
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providers: {},
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toHex: function(str) {
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var hex = "";
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for(var i = 0; i < str.length; i++) {
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var n = str.charCodeAt(i).toString(16);
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hex += n.length < 2 ? '0' + n : n;
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}
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return hex;
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},
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toAscii: function(hex) {
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// Find termination
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var str = "";
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var i = 0, l = hex.length;
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if (hex.substring(0, 2) == '0x')
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i = 2;
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for(; i < l; i+=2) {
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var code = hex.charCodeAt(i);
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if(code === 0) {
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break;
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}
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str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
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}
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return str;
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},
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toDecimal: function (val) {
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return parseInt(val, 16);
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},
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fromAscii: function(str, pad) {
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pad = pad === undefined ? 32 : pad;
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var hex = this.toHex(str);
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while(hex.length < pad*2)
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hex += "00";
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return "0x" + hex;
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},
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eth: {
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prototype: Object(), // jshint ignore:line
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watch: function (params) {
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return new Filter(params, ethWatch);
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}
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},
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db: {
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prototype: Object() // jshint ignore:line
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},
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shh: {
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prototype: Object(), // jshint ignore:line
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watch: function (params) {
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return new Filter(params, shhWatch);
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}
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},
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on: function(event, id, cb) {
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if(web3._events[event] === undefined) {
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web3._events[event] = {};
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}
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web3._events[event][id] = cb;
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return this;
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},
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off: function(event, id) {
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if(web3._events[event] !== undefined) {
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delete web3._events[event][id];
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}
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return this;
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},
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trigger: function(event, id, data) {
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var callbacks = web3._events[event];
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if (!callbacks || !callbacks[id]) {
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return;
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}
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var cb = callbacks[id];
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cb(data);
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}
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};
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var eth = web3.eth;
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setupMethods(eth, ethMethods());
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setupProperties(eth, ethProperties());
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setupMethods(web3.db, dbMethods());
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setupMethods(web3.shh, shhMethods());
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var ethWatch = {
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changed: 'changed'
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};
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setupMethods(ethWatch, ethWatchMethods());
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var shhWatch = {
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changed: 'shhChanged'
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};
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setupMethods(shhWatch, shhWatchMethods());
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var ProviderManager = function() {
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this.queued = [];
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this.polls = [];
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this.ready = false;
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this.provider = undefined;
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this.id = 1;
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var self = this;
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var poll = function () {
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if (self.provider && self.provider.poll) {
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self.polls.forEach(function (data) {
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data.data._id = self.id;
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self.id++;
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self.provider.poll(data.data, data.id);
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});
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}
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setTimeout(poll, 12000);
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};
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poll();
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};
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ProviderManager.prototype.send = function(data, cb) {
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data._id = this.id;
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if (cb) {
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web3._callbacks[data._id] = cb;
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}
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data.args = data.args || [];
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this.id++;
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if(this.provider !== undefined) {
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this.provider.send(data);
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} else {
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console.warn("provider is not set");
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this.queued.push(data);
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}
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};
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ProviderManager.prototype.set = function(provider) {
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if(this.provider !== undefined && this.provider.unload !== undefined) {
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this.provider.unload();
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}
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this.provider = provider;
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this.ready = true;
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};
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ProviderManager.prototype.sendQueued = function() {
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for(var i = 0; this.queued.length; i++) {
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// Resend
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this.send(this.queued[i]);
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}
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};
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ProviderManager.prototype.installed = function() {
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return this.provider !== undefined;
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};
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ProviderManager.prototype.startPolling = function (data, pollId) {
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if (!this.provider || !this.provider.poll) {
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return;
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}
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this.polls.push({data: data, id: pollId});
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};
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ProviderManager.prototype.stopPolling = function (pollId) {
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for (var i = this.polls.length; i--;) {
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var poll = this.polls[i];
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if (poll.id === pollId) {
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this.polls.splice(i, 1);
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}
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}
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};
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web3.provider = new ProviderManager();
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web3.setProvider = function(provider) {
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provider.onmessage = messageHandler;
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web3.provider.set(provider);
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web3.provider.sendQueued();
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};
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var Filter = function(options, impl) {
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this.impl = impl;
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this.callbacks = [];
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var self = this;
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this.promise = impl.newFilter(options);
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this.promise.then(function (id) {
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self.id = id;
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web3.on(impl.changed, id, self.trigger.bind(self));
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web3.provider.startPolling({call: impl.changed, args: [id]}, id);
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});
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};
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Filter.prototype.arrived = function(callback) {
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this.changed(callback);
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};
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Filter.prototype.changed = function(callback) {
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var self = this;
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this.promise.then(function(id) {
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self.callbacks.push(callback);
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});
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};
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Filter.prototype.trigger = function(messages) {
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for(var i = 0; i < this.callbacks.length; i++) {
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this.callbacks[i].call(this, messages);
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}
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};
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Filter.prototype.uninstall = function() {
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var self = this;
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this.promise.then(function (id) {
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self.impl.uninstallFilter(id);
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web3.provider.stopPolling(id);
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web3.off(impl.changed, id);
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});
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};
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Filter.prototype.messages = function() {
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var self = this;
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return this.promise.then(function (id) {
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return self.impl.getMessages(id);
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});
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};
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function messageHandler(data) {
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if(data._event !== undefined) {
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web3.trigger(data._event, data._id, data.data);
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return;
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}
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if(data._id) {
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var cb = web3._callbacks[data._id];
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if (cb) {
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cb.call(this, data.error, data.data)
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delete web3._callbacks[data._id];
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}
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}
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}
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module.exports = web3;
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