129 lines
3.7 KiB
JavaScript
129 lines
3.7 KiB
JavaScript
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/*
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Copyright 2018 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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try { Object.defineProperty(Array.prototype, "peek", { value: function () { return (this.length > 0 ? this[this.length - 1] : undefined); } }); } catch (e) { }
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function dbus(address, uid)
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{
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this._ObjectID = 'linux-dbus';
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require('events').EventEmitter.call(this, true)
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.createEvent('signal');
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Object.defineProperty(this, "uid", { value: uid });
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this._child = require('child_process').execFile("/bin/sh", ["sh"], { type: require('child_process').SpawnTypes.TERM, uid: uid == null ? -1 : uid });
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this._child.stdin.write('dbus-monitor --session "type=\'signal\', interface=\'' + address + '\'" | ( while true; do read X; echo "$X"; done )\n');
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this._child.stdout.dbus = this;
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this._child.stdout.on('data', function (chunk)
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{
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// Parse DBUS Data
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if (!this.ready) { this.ready = true; return; }
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var lines = [];
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var tokens = chunk.toString().split('\r\n');
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for (var i in tokens)
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{
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if (tokens[i] == '')
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{
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// End of record
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this.dbus.preParseRecords(lines);
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lines = [];
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}
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else
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{
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lines.push(tokens[i]);
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}
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}
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});
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this.preParseRecords = function (lines)
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{
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var record = [];
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for (var i in lines)
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{
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if(lines[i].startsWith('signal '))
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{
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if(record.length>0)
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{
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this.parseRecords(record);
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}
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record = [];
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}
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record.push(lines[i]);
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}
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if (record.length > 0)
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{
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this.parseRecords(record);
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}
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}
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this.parseRecords = function (lines)
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{
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if (lines[0].startsWith('signal '))
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{
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var signal = {};
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var sigtokens = lines[0].split(' ');
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sigtokens.shift();
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for (var i in sigtokens) {
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var sigitems = sigtokens[i].split('=');
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if (sigitems.length == 2) {
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signal[sigitems[0]] = sigitems[1];
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}
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}
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lines.shift();
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signal.data = lines;
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this.parseSignal(signal);
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}
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}
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this.parseSignal = function(signal)
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{
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var data = signal.data;
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signal.data = [];
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for(var i=0; i<data.length; ++i)
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{
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if (data[i].startsWith('array '))
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{
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signal.data.push([]);
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for(i=i+1; i<data.length; ++i)
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{
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this.parseSignal2(data[i], signal.data.peek());
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}
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}
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else
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{
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this.parseSignal2(data[i], signal.data);
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}
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}
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this.emit('signal', signal);
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}
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this.parseSignal2 = function (inputStr, outArray)
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{
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if(inputStr.startsWith('string '))
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{
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outArray.push(JSON.parse(inputStr.slice(7)));
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}
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else if(inputStr.startsWith('boolean '))
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{
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outArray.push(JSON.parse(inputStr.slice(8)));
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}
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}
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}
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module.exports = dbus;
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