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'use strict';
const Command = require('./command');
const CommandCode = require('../constants/commands');
const Packet = require('../packets/packet');
// TODO: time statistics?
// usefull for queue size and network latency monitoring
// store created,sent,reply timestamps
class Ping extends Command {
constructor(callback) {
super();
this.onResult = callback;
}
start(packet, connection) {
const ping = new Packet(
0,
Buffer.from([1, 0, 0, 0, CommandCode.PING]),
0,
5
);
connection.writePacket(ping);
return Ping.prototype.pingResponse;
}
pingResponse() {
// TODO: check it's OK packet. error check already done in caller
if (this.onResult) {
process.nextTick(this.onResult.bind(this));
}
return null;
}
}
module.exports = Ping;