forked from mirror/go-ethereum
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/* |
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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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|
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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 providermanager.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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* Gav Wood <g@ethdev.com> |
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* @date 2014 |
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*/ |
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// TODO: is these line is supposed to be here?
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if (process.env.NODE_ENV !== 'build') { |
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var web3 = require('./web3'); // jshint ignore:line
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} |
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/// Provider manager object prototype
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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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/// sends outgoing requests, if provider is not available, enqueue the request
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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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/// setups provider, which will be used for sending messages
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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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/// resends queued messages
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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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/// @returns true if the provider i properly set
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ProviderManager.prototype.installed = function() { |
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return this.provider !== undefined; |
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}; |
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/// this method is only used, when we do not have native qt bindings and have to do polling on our own
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/// should be callled, on start watching for eth/shh changes
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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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/// should be called to stop polling for certain watch changes
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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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module.exports = ProviderManager; |
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