Initial commit

2026-08-30 15:23:57 +02:00
commit dab5679098
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+//  SPDX-License-Identifier: LGPL-2.1-or-later
+//  Copyright (c) 2015-2024 MariaDB Corporation Ab
+
+'use strict';
+
+import Command from './command.js';
+import * as ServerStatus from '../const/server-status.js';
+
+const PING_COMMAND = new Uint8Array([1, 0, 0, 0, 0x0e]);
+
+/**
+ * send a COM_PING: permits sending a packet containing one byte to check that the connection is active.
+ * see https://mariadb.com/kb/en/library/com_ping/
+ */
+class Ping extends Command {
+  constructor(cmdParam, resolve, reject) {
+    super(cmdParam, resolve, reject);
+  }
+
+  start(out, opts, info) {
+    if (opts.logger.query) opts.logger.query('PING');
+    this.onPacketReceive = this.readPingResponsePacket;
+    out.fastFlush(this, PING_COMMAND);
+    this.emit('send_end');
+  }
+
+  /**
+   * Read ping response packet.
+   * packet can be :
+   * - an ERR_Packet
+   * - an OK_Packet
+   *
+   * @param packet  query response
+   * @param out     output writer
+   * @param opts    connection options
+   * @param info    connection info
+   */
+  readPingResponsePacket(packet, out, opts, info) {
+    packet.skip(1); //skip header
+    packet.skipLengthCodedNumber(); //affected rows
+    packet.skipLengthCodedNumber(); //insert ids
+    info.status = packet.readUInt16();
+    if (info.redirectRequest && (info.status & ServerStatus.STATUS_IN_TRANS) === 0) {
+      info.redirect(info.redirectRequest, this.successEnd.bind(this, null));
+    } else {
+      this.successEnd(null);
+    }
+  }
+}
+
+export default Ping;