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102 lines
3.1 KiB
JavaScript
102 lines
3.1 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 filter.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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var web3 = require('./web3'); // jshint ignore:line
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/// should be used when we want to watch something
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/// it's using inner polling mechanism and is notified about changes
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/// TODO: change 'options' name cause it may be not the best matching one, since we have events
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var Filter = function(options, impl) {
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if (typeof options !== "string") {
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// topics property is deprecated, warn about it!
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if (options.topics) {
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console.warn('"topics" is deprecated, use "topic" instead');
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}
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this._onWatchResult = options._onWatchEventResult;
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// evaluate lazy properties
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options = {
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to: options.to,
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topic: options.topic,
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earliest: options.earliest,
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latest: options.latest,
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max: options.max,
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skip: options.skip,
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address: options.address
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};
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}
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this.impl = impl;
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this.callbacks = [];
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this.id = impl.newFilter(options);
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web3.provider.startPolling({call: impl.changed, args: [this.id]}, this.id, this.trigger.bind(this));
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};
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/// alias for changed*
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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.happened = function(callback) {
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this.changed(callback);
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};
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/// gets called when there is new eth/shh message
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Filter.prototype.changed = function(callback) {
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this.callbacks.push(callback);
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};
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/// trigger calling new message from people
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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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for (var j = 0; j < messages.length; j++) {
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var message = this._onWatchResult ? this._onWatchResult(messages[j]) : messages[j];
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this.callbacks[i].call(this, message);
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}
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}
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};
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/// should be called to uninstall current filter
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Filter.prototype.uninstall = function() {
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this.impl.uninstallFilter(this.id);
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web3.provider.stopPolling(this.id);
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};
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/// should be called to manually trigger getting latest messages from the client
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Filter.prototype.messages = function() {
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return this.impl.getMessages(this.id);
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};
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/// alias for messages
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Filter.prototype.logs = function () {
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return this.messages();
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};
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module.exports = Filter;
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