105 lines
3.3 KiB
JavaScript
105 lines
3.3 KiB
JavaScript
/*
|
|
This file is part of ethereum.js.
|
|
|
|
ethereum.js is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ethereum.js is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file providermanager.js
|
|
* @authors:
|
|
* Jeffrey Wilcke <jeff@ethdev.com>
|
|
* Marek Kotewicz <marek@ethdev.com>
|
|
* Marian Oancea <marian@ethdev.com>
|
|
* Gav Wood <g@ethdev.com>
|
|
* @date 2014
|
|
*/
|
|
|
|
var web3 = require('./web3'); // jshint ignore:line
|
|
|
|
/**
|
|
* Provider manager object prototype
|
|
* It's responsible for passing messages to providers
|
|
* If no provider is set it's responsible for queuing requests
|
|
* It's also responsible for polling the ethereum node for incoming messages
|
|
* Default poll timeout is 12 seconds
|
|
* If we are running ethereum.js inside ethereum browser, there are backend based tools responsible for polling,
|
|
* and provider manager polling mechanism is not used
|
|
*/
|
|
var ProviderManager = function() {
|
|
this.polls = [];
|
|
this.provider = undefined;
|
|
this.id = 1;
|
|
|
|
var self = this;
|
|
var poll = function () {
|
|
if (self.provider) {
|
|
self.polls.forEach(function (data) {
|
|
data.data._id = self.id;
|
|
self.id++;
|
|
var result = self.provider.send(data.data);
|
|
|
|
result = JSON.parse(result);
|
|
|
|
// dont call the callback if result is not an array, or empty one
|
|
if (result.error || !(result.result instanceof Array) || result.result.length === 0) {
|
|
return;
|
|
}
|
|
|
|
data.callback(result.result);
|
|
});
|
|
}
|
|
setTimeout(poll, 12000);
|
|
};
|
|
poll();
|
|
};
|
|
|
|
/// sends outgoing requests
|
|
ProviderManager.prototype.send = function(data) {
|
|
|
|
data.args = data.args || [];
|
|
data._id = this.id++;
|
|
|
|
if (this.provider === undefined) {
|
|
console.error('provider is not set');
|
|
return null;
|
|
}
|
|
|
|
//TODO: handle error here?
|
|
var result = this.provider.send(data);
|
|
result = JSON.parse(result);
|
|
return result.result;
|
|
};
|
|
|
|
/// setups provider, which will be used for sending messages
|
|
ProviderManager.prototype.set = function(provider) {
|
|
this.provider = provider;
|
|
};
|
|
|
|
/// this method is only used, when we do not have native qt bindings and have to do polling on our own
|
|
/// should be callled, on start watching for eth/shh changes
|
|
ProviderManager.prototype.startPolling = function (data, pollId, callback) {
|
|
this.polls.push({data: data, id: pollId, callback: callback});
|
|
};
|
|
|
|
/// should be called to stop polling for certain watch changes
|
|
ProviderManager.prototype.stopPolling = function (pollId) {
|
|
for (var i = this.polls.length; i--;) {
|
|
var poll = this.polls[i];
|
|
if (poll.id === pollId) {
|
|
this.polls.splice(i, 1);
|
|
}
|
|
}
|
|
};
|
|
|
|
module.exports = ProviderManager;
|
|
|