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This file is part of susyweb.js.
susyweb.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.
susyweb.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MSRCHANTABILITY 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 susyweb.js. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file httpprovider.js
* @authors:
* Marek Kotewicz <marek@superstring.io>
* Marian Oancea
* Fabian Vogelsteller <fabian@ethereum.org>
* @date 2015
*/
var errors = require('susyweb-core-helpers').errors;
var XHR2 = require('xhr2');
/**
* HttpProvider should be used to send rpc calls over http
*/
var HttpProvider = function HttpProvider(host, timeout, headers) {
this.host = host || 'http://localhost:8545';
this.timeout = timeout || 0;
this.connected = false;
this.headers = headers;
};
HttpProvider.prototype._prepareRequest = function(){
var request = new XHR2();
request.open('POST', this.host, true);
request.setRequestHeader('Content-Type','application/json');
if(this.headers) {
this.headers.forEach(function(header) {
request.setRequestHeader(header.name, header.value);
});
}
return request;
};
/**
* Should be used to make async request
*
* @method send
* @param {Object} payload
* @param {Function} callback triggered on end with (err, result)
*/
HttpProvider.prototype.send = function (payload, callback) {
var _this = this;
var request = this._prepareRequest();
request.onreadystatechange = function() {
if (request.readyState === 4 && request.timeout !== 1) {
var result = request.responseText;
var error = null;
try {
result = JSON.parse(result);
} catch(e) {
error = errors.InvalidResponse(request.responseText);
}
_this.connected = true;
callback(error, result);
}
};
request.ontimeout = function() {
_this.connected = false;
callback(errors.ConnectionTimeout(this.timeout));
};
try {
request.send(JSON.stringify(payload));
} catch(error) {
this.connected = false;
callback(errors.InvalidConnection(this.host));
}
};
module.exports = HttpProvider;
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