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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the qtqa module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
const EventEmitter = require("events");
const uuidv1 = require("uuid/v1");
const postgreSQLClient = require("./postgreSQLClient");
const toolbox = require("./toolbox");
class retryProcessor extends EventEmitter {
constructor(requestProcessor) {
super();
this.requestProcessor = requestProcessor;
}
addRetryJob(retryAction, args) {
let _this = this;
const retryUuid = uuidv1();
postgreSQLClient.insert(
"retry_queue", ["uuid", "retryaction", "args"],
[retryUuid, retryAction, toolbox.encodeJSONtoBase64(args)],
function() {
console.log(`Retry ${retryAction} registered for ${retryUuid}`);
// Call retry in 30 seconds.
setTimeout(function() {
_this.emit("processRetry", retryUuid);
}, 30000);
}
);
}
// Process a retry item and call its original callback, which should resume
// the process where it left off.
processRetry(uuid, callback) {
console.log(`Processing retry event with uuid ${uuid}`);
let _this = this;
function deleteRetryRecord() {
postgreSQLClient.deleteDBEntry("retry_queue", "uuid", uuid, function(success, data) {});
}
postgreSQLClient.query("retry_queue", undefined, "uuid", uuid, function(success, row) {
if (success) {
deleteRetryRecord();
let args = toolbox.decodeBase64toJSON(row.args);
_this.requestProcessor.emit(row.retryaction, ...args);
} else if (callback) {
callback(false, row);
} else {
// This is a silent failure and may leave orphaned jobs.
// All calls to processRetry should pass a callback for safety.
}
});
}
}
module.exports = retryProcessor;
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