52 lines
1.4 KiB
JavaScript
Executable File
52 lines
1.4 KiB
JavaScript
Executable File
// SPDX-License-Identifier: LGPL-2.1-or-later
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// Copyright (c) 2015-2024 MariaDB Corporation Ab
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'use strict';
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const Command = require('./command');
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const ServerStatus = require('../const/server-status');
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const PING_COMMAND = new Uint8Array([1, 0, 0, 0, 0x0e]);
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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(cmdParam, resolve, reject) {
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super(cmdParam, resolve, reject);
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}
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start(out, opts, info) {
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if (opts.logger.query) opts.logger.query('PING');
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this.onPacketReceive = this.readPingResponsePacket;
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out.fastFlush(this, PING_COMMAND);
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this.emit('send_end');
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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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* - an 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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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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if (info.redirectRequest && (info.status & ServerStatus.STATUS_IN_TRANS) === 0) {
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info.redirect(info.redirectRequest, this.successEnd.bind(this, null));
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} else {
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this.successEnd(null);
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}
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}
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}
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module.exports = Ping;
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