53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
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'use strict';
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const Command = require('./command');
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const Errors = require('../misc/errors');
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/**
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* send a COM_PING: permits sending a packet containing one byte to check that the connection is active.
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* see https://mariadb.com/kb/en/library/com_ping/
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*/
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class Ping extends Command {
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constructor(resolve, reject) {
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super(resolve, reject);
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}
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start(out, opts, info) {
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out.startPacket(this);
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out.writeInt8(0x0e);
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out.flushBuffer(true);
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this.emit('send_end');
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this.onPacketReceive = this.readPingResponsePacket;
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}
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/**
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* Read ping response packet.
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* packet can be :
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* - an ERR_Packet
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* - a OK_Packet
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*
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* @param packet query response
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* @param out output writer
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* @param opts connection options
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* @param info connection info
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*/
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readPingResponsePacket(packet, out, opts, info) {
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if (packet.peek() !== 0x00) {
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return this.throwNewError(
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'unexpected packet',
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false,
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info,
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'42000',
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Errors.ER_PING_BAD_PACKET
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);
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}
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packet.skip(1); //skip header
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packet.skipLengthCodedNumber(); //affected rows
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packet.skipLengthCodedNumber(); //insert ids
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info.status = packet.readUInt16();
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this.successEnd(null);
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}
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}
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module.exports = Ping;
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