mirror of https://github.com/status-im/web3.js.git
93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
/*
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This file is part of web3.js.
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web3.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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web3.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 web3.js. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file syncing.js
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* @authors:
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* Fabian Vogelsteller <fabian@ethdev.com>
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* @date 2015
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*/
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var formatters = require('./formatters');
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var utils = require('../utils/utils');
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/**
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Adds the callback and sets up the methods, to iterate over the results.
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@method pollSyncing
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@param {Object} self
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*/
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var pollSyncing = function(self) {
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var lastSyncState = false;
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var onMessage = function (error, sync) {
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if (error) {
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return self.callbacks.forEach(function (callback) {
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callback(error);
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});
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}
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if(utils.isObject(sync))
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sync = formatters.outputSyncingFormatter(sync);
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self.callbacks.forEach(function (callback) {
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if (lastSyncState !== sync) {
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// call the callback with true first so the app can stop anything, before receiving the sync data
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if(!lastSyncState && utils.isObject(sync))
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callback(null, true);
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// call on the next CPU cycle, so the actions of the sync stop can be processes first
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setTimeout(function() {
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callback(null, sync);
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}, 1);
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lastSyncState = sync;
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}
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});
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};
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self.requestManager.startPolling({
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method: 'eth_syncing',
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params: [],
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}, self.pollId, onMessage, self.stopWatching.bind(self));
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};
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var IsSyncing = function (web3, callback) {
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this._web3 = web3;
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this.requestManager = web3._requestManager;
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this.pollId = 'syncPoll_'+ Math.floor(Math.random() * 1000);
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this.callbacks = [];
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this.addCallback(callback);
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pollSyncing(this);
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return this;
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};
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IsSyncing.prototype.addCallback = function (callback) {
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if(callback)
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this.callbacks.push(callback);
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return this;
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};
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IsSyncing.prototype.stopWatching = function () {
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this._web3._requestManager.stopPolling(this.pollId);
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this.callbacks = [];
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};
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module.exports = IsSyncing;
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