Update:Remove node-cron dependency

package-lock.json

@@ -22,7 +22,6 @@
         "htmlparser2": "^8.0.1",
         "jsonwebtoken": "^8.5.1",
         "libgen": "^2.1.0",
-        "node-cron": "^3.0.0",
         "node-ffprobe": "^3.0.0",
         "node-stream-zip": "^1.15.0",
         "proper-lockfile": "^4.1.2",
@@ -1381,14 +1380,6 @@
         "node": ">= 0.6"
       }
     },
-    "node_modules/node-cron": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/node-cron/-/node-cron-3.0.1.tgz",
-      "integrity": "sha512-RAWZTNn2M5KDIUV/389UX0EXsqvdFAwc9QwHQceh0Ga56dygqSRthqIjwpgZsoDspHGt2rkHdk9Z4RgfPMdALw==",
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
     "node_modules/node-ffprobe": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/node-ffprobe/-/node-ffprobe-3.0.0.tgz",
@@ -3022,11 +3013,6 @@
       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
       "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg=="
     },
-    "node-cron": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/node-cron/-/node-cron-3.0.1.tgz",
-      "integrity": "sha512-RAWZTNn2M5KDIUV/389UX0EXsqvdFAwc9QwHQceh0Ga56dygqSRthqIjwpgZsoDspHGt2rkHdk9Z4RgfPMdALw=="
-    },
     "node-ffprobe": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/node-ffprobe/-/node-ffprobe-3.0.0.tgz",

package.json

@@ -41,7 +41,6 @@
     "htmlparser2": "^8.0.1",
     "jsonwebtoken": "^8.5.1",
     "libgen": "^2.1.0",
-    "node-cron": "^3.0.0",
     "node-ffprobe": "^3.0.0",
     "node-stream-zip": "^1.15.0",
     "proper-lockfile": "^4.1.2",

server/libs/nodeCron/background-scheduled-task/daemon.js

@@ -0,0 +1,19 @@
+const ScheduledTask = require('../scheduled-task');
+
+let scheduledTask;
+
+function register(message){
+    const script = require(message.path);
+    scheduledTask = new ScheduledTask(message.cron, script.task, message.options);
+    scheduledTask.on('task-done', (result) => {
+        process.send({ type: 'task-done', result});
+    });
+    process.send({ type: 'registred' });
+}
+
+process.on('message', (message) => {
+    switch(message.type){
+    case 'register':
+        return register(message);
+    }
+});

server/libs/nodeCron/background-scheduled-task/index.js

@@ -0,0 +1,67 @@
+const EventEmitter = require('events');
+const path = require('path');
+const { fork } = require('child_process');
+const { getId } = require('../../../utils/index')
+
+const daemonPath = `${__dirname}/daemon.js`;
+
+class BackgroundScheduledTask extends EventEmitter {
+    constructor(cronExpression, taskPath, options) {
+        super();
+        if (!options) {
+            options = {
+                scheduled: true,
+                recoverMissedExecutions: false,
+            };
+        }
+        this.cronExpression = cronExpression;
+        this.taskPath = taskPath;
+        this.options = options;
+        this.options.name = this.options.name || getId()
+
+        if (options.scheduled) {
+            this.start();
+        }
+    }
+
+    start() {
+        this.stop();
+        this.forkProcess = fork(daemonPath);
+
+        this.forkProcess.on('message', (message) => {
+            switch (message.type) {
+                case 'task-done':
+                    this.emit('task-done', message.result);
+                    break;
+            }
+        });
+
+        let options = this.options;
+        options.scheduled = true;
+
+        this.forkProcess.send({
+            type: 'register',
+            path: path.resolve(this.taskPath),
+            cron: this.cronExpression,
+            options: options
+        });
+    }
+
+    stop() {
+        if (this.forkProcess) {
+            this.forkProcess.kill();
+        }
+    }
+
+    pid() {
+        if (this.forkProcess) {
+            return this.forkProcess.pid;
+        }
+    }
+
+    isRunning() {
+        return !this.forkProcess.killed;
+    }
+}
+
+module.exports = BackgroundScheduledTask;

server/libs/nodeCron/convert-expression/asterisk-to-range-conversion.js

@@ -0,0 +1,21 @@
+'use strict';
+module.exports = (() => {
+    function convertAsterisk(expression, replecement){
+        if(expression.indexOf('*') !== -1){
+            return expression.replace('*', replecement);
+        }
+        return expression;
+    }
+
+    function convertAsterisksToRanges(expressions){
+        expressions[0] = convertAsterisk(expressions[0], '0-59');
+        expressions[1] = convertAsterisk(expressions[1], '0-59');
+        expressions[2] = convertAsterisk(expressions[2], '0-23');
+        expressions[3] = convertAsterisk(expressions[3], '1-31');
+        expressions[4] = convertAsterisk(expressions[4], '1-12');
+        expressions[5] = convertAsterisk(expressions[5], '0-6');
+        return expressions;
+    }
+
+    return convertAsterisksToRanges;
+})();

server/libs/nodeCron/convert-expression/index.js

@@ -0,0 +1,69 @@
+'use strict';
+
+// SOURCE: https://github.com/node-cron/node-cron
+// LICENSE: https://github.com/node-cron/node-cron/blob/master/LICENSE.md
+
+const monthNamesConversion = require('./month-names-conversion');
+const weekDayNamesConversion = require('./week-day-names-conversion');
+const convertAsterisksToRanges = require('./asterisk-to-range-conversion');
+const convertRanges = require('./range-conversion');
+const convertSteps = require('./step-values-conversion');
+
+module.exports = (() => {
+
+    function appendSeccondExpression(expressions) {
+        if (expressions.length === 5) {
+            return ['0'].concat(expressions);
+        }
+        return expressions;
+    }
+
+    function removeSpaces(str) {
+        return str.replace(/\s{2,}/g, ' ').trim();
+    }
+
+    // Function that takes care of normalization.
+    function normalizeIntegers(expressions) {
+        for (let i = 0; i < expressions.length; i++) {
+            const numbers = expressions[i].split(',');
+            for (let j = 0; j < numbers.length; j++) {
+                numbers[j] = parseInt(numbers[j]);
+            }
+            expressions[i] = numbers;
+        }
+        return expressions;
+    }
+
+    /*
+   * The node-cron core allows only numbers (including multiple numbers e.g 1,2).
+   * This module is going to translate the month names, week day names and ranges
+   * to integers relatives.
+   *
+   * Month names example:
+   *  - expression 0 1 1 January,Sep *
+   *  - Will be translated to 0 1 1 1,9 *
+   *
+   * Week day names example:
+   *  - expression 0 1 1 2 Monday,Sat
+   *  - Will be translated to 0 1 1 1,5 *
+   *
+   * Ranges example:
+   *  - expression 1-5 * * * *
+   *  - Will be translated to 1,2,3,4,5 * * * *
+   */
+    function interprete(expression) {
+        let expressions = removeSpaces(expression).split(' ');
+        expressions = appendSeccondExpression(expressions);
+        expressions[4] = monthNamesConversion(expressions[4]);
+        expressions[5] = weekDayNamesConversion(expressions[5]);
+        expressions = convertAsterisksToRanges(expressions);
+        expressions = convertRanges(expressions);
+        expressions = convertSteps(expressions);
+
+        expressions = normalizeIntegers(expressions);
+
+        return expressions.join(' ');
+    }
+
+    return interprete;
+})();

server/libs/nodeCron/convert-expression/month-names-conversion.js

@@ -0,0 +1,22 @@
+'use strict';
+module.exports = (() => {
+    const months = ['january','february','march','april','may','june','july',
+        'august','september','october','november','december'];
+    const shortMonths = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug',
+        'sep', 'oct', 'nov', 'dec'];
+
+    function convertMonthName(expression, items){
+        for(let i = 0; i < items.length; i++){
+            expression = expression.replace(new RegExp(items[i], 'gi'), parseInt(i, 10) + 1);
+        }
+        return expression;
+    }
+
+    function interprete(monthExpression){
+        monthExpression = convertMonthName(monthExpression, months);
+        monthExpression = convertMonthName(monthExpression, shortMonths);
+        return monthExpression;
+    }
+
+    return interprete;
+})();

server/libs/nodeCron/convert-expression/range-conversion.js

@@ -0,0 +1,39 @@
+'use strict';
+module.exports = ( () => {
+    function replaceWithRange(expression, text, init, end) {
+
+        const numbers = [];
+        let last = parseInt(end);
+        let first = parseInt(init);
+
+        if(first > last){
+            last = parseInt(init);
+            first = parseInt(end);
+        }
+
+        for(let i = first; i <= last; i++) {
+            numbers.push(i);
+        }
+
+        return expression.replace(new RegExp(text, 'i'), numbers.join());
+    }
+
+    function convertRange(expression){
+        const rangeRegEx = /(\d+)-(\d+)/;
+        let match = rangeRegEx.exec(expression);
+        while(match !== null && match.length > 0){
+            expression = replaceWithRange(expression, match[0], match[1], match[2]);
+            match = rangeRegEx.exec(expression);
+        }
+        return expression;
+    }
+
+    function convertAllRanges(expressions){
+        for(let i = 0; i < expressions.length; i++){
+            expressions[i] = convertRange(expressions[i]);
+        }
+        return expressions;
+    }
+
+    return convertAllRanges;
+})();

server/libs/nodeCron/convert-expression/step-values-conversion.js

@@ -0,0 +1,30 @@
+'use strict';
+
+module.exports = (() => {
+    function convertSteps(expressions){
+        var stepValuePattern = /^(.+)\/(\w+)$/;
+        for(var i = 0; i < expressions.length; i++){
+            var match = stepValuePattern.exec(expressions[i]);
+            var isStepValue = match !== null && match.length > 0;
+            if(isStepValue){
+                var baseDivider = match[2];
+                if(isNaN(baseDivider)){
+                    throw baseDivider + ' is not a valid step value';
+                }
+                var values = match[1].split(',');
+                var stepValues = [];
+                var divider = parseInt(baseDivider, 10);
+                for(var j = 0; j <= values.length; j++){
+                    var value = parseInt(values[j], 10);
+                    if(value % divider === 0){
+                        stepValues.push(value);
+                    }
+                }
+                expressions[i] = stepValues.join(',');
+            }
+        }
+        return expressions;
+    }
+
+    return convertSteps;
+})();

server/libs/nodeCron/convert-expression/week-day-names-conversion.js

@@ -0,0 +1,21 @@
+'use strict';
+module.exports = (() => {
+    const weekDays = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday',
+        'friday', 'saturday'];
+    const shortWeekDays = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'];
+
+    function convertWeekDayName(expression, items){
+        for(let i = 0; i < items.length; i++){
+            expression = expression.replace(new RegExp(items[i], 'gi'), parseInt(i, 10));
+        }
+        return expression;
+    }
+  
+    function convertWeekDays(expression){
+        expression = expression.replace('7', '0');
+        expression = convertWeekDayName(expression, weekDays);
+        return convertWeekDayName(expression, shortWeekDays);
+    }
+
+    return convertWeekDays;
+})();

server/libs/nodeCron/index.js

@@ -0,0 +1,64 @@
+'use strict';
+
+const ScheduledTask = require('./scheduled-task');
+const BackgroundScheduledTask = require('./background-scheduled-task');
+const validation = require('./pattern-validation');
+const storage = require('./storage');
+
+/**
+ * @typedef {Object} CronScheduleOptions
+ * @prop {boolean} [scheduled] if a scheduled task is ready and running to be
+ *  performed when the time matches the cron expression.
+ * @prop {string} [timezone] the timezone to execute the task in.
+ */
+
+/**
+ * Creates a new task to execute the given function when the cron
+ *  expression ticks.
+ *
+ * @param {string} expression The cron expression.
+ * @param {Function} func The task to be executed.
+ * @param {CronScheduleOptions} [options] A set of options for the scheduled task.
+ * @returns {ScheduledTask} The scheduled task.
+ */
+function schedule(expression, func, options) {
+    const task = createTask(expression, func, options);
+
+    storage.save(task);
+
+    return task;
+}
+
+function createTask(expression, func, options) {
+    if (typeof func === 'string')
+        return new BackgroundScheduledTask(expression, func, options);
+
+    return new ScheduledTask(expression, func, options);
+}
+
+/**
+ * Check if a cron expression is valid.
+ *
+ * @param {string} expression The cron expression.
+ * @returns {boolean} Whether the expression is valid or not.
+ */
+function validate(expression) {
+    try {
+        validation(expression);
+
+        return true;
+    } catch (_) {
+        return false;
+    }
+}
+
+/**
+ * Gets the scheduled tasks.
+ *
+ * @returns {ScheduledTask[]} The scheduled tasks.
+ */
+function getTasks() {
+    return storage.getTasks();
+}
+
+module.exports = { schedule, validate, getTasks };

server/libs/nodeCron/pattern-validation.js

@@ -0,0 +1,124 @@
+'use strict';
+
+const convertExpression = require('./convert-expression');
+
+const validationRegex = /^(?:\d+|\*|\*\/\d+)$/;
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @param {number} min The minimum value.
+ * @param {number} max The maximum value.
+ * @returns {boolean}
+ */
+function isValidExpression(expression, min, max) {
+    const options = expression.split(',');
+
+    for (const option of options) {
+        const optionAsInt = parseInt(option, 10);
+
+        if (
+            (!Number.isNaN(optionAsInt) &&
+                (optionAsInt < min || optionAsInt > max)) ||
+            !validationRegex.test(option)
+        )
+            return false;
+    }
+
+    return true;
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidSecond(expression) {
+    return !isValidExpression(expression, 0, 59);
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidMinute(expression) {
+    return !isValidExpression(expression, 0, 59);
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidHour(expression) {
+    return !isValidExpression(expression, 0, 23);
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidDayOfMonth(expression) {
+    return !isValidExpression(expression, 1, 31);
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidMonth(expression) {
+    return !isValidExpression(expression, 1, 12);
+}
+
+/**
+ * @param {string} expression The Cron-Job expression.
+ * @returns {boolean}
+ */
+function isInvalidWeekDay(expression) {
+    return !isValidExpression(expression, 0, 7);
+}
+
+/**
+ * @param {string[]} patterns The Cron-Job expression patterns.
+ * @param {string[]} executablePatterns The executable Cron-Job expression
+ * patterns.
+ * @returns {void}
+ */
+function validateFields(patterns, executablePatterns) {
+    if (isInvalidSecond(executablePatterns[0]))
+        throw new Error(`${patterns[0]} is a invalid expression for second`);
+
+    if (isInvalidMinute(executablePatterns[1]))
+        throw new Error(`${patterns[1]} is a invalid expression for minute`);
+
+    if (isInvalidHour(executablePatterns[2]))
+        throw new Error(`${patterns[2]} is a invalid expression for hour`);
+
+    if (isInvalidDayOfMonth(executablePatterns[3]))
+        throw new Error(
+            `${patterns[3]} is a invalid expression for day of month`
+        );
+
+    if (isInvalidMonth(executablePatterns[4]))
+        throw new Error(`${patterns[4]} is a invalid expression for month`);
+
+    if (isInvalidWeekDay(executablePatterns[5]))
+        throw new Error(`${patterns[5]} is a invalid expression for week day`);
+}
+
+/**
+ * Validates a Cron-Job expression pattern.
+ *
+ * @param {string} pattern The Cron-Job expression pattern.
+ * @returns {void}
+ */
+function validate(pattern) {
+    if (typeof pattern !== 'string')
+        throw new TypeError('pattern must be a string!');
+
+    const patterns = pattern.split(' ');
+    const executablePatterns = convertExpression(pattern).split(' ');
+
+    if (patterns.length === 5) patterns.unshift('0');
+
+    validateFields(patterns, executablePatterns);
+}
+
+module.exports = validate;

server/libs/nodeCron/scheduled-task.js

@@ -0,0 +1,51 @@
+'use strict';
+
+const EventEmitter = require('events');
+const Task = require('./task');
+const Scheduler = require('./scheduler');
+const { getId } = require('../../utils/index')
+
+class ScheduledTask extends EventEmitter {
+    constructor(cronExpression, func, options) {
+        super();
+        if (!options) {
+            options = {
+                scheduled: true,
+                recoverMissedExecutions: false
+            };
+        }
+
+        this.options = options;
+        this.options.name = this.options.name || getId()
+
+        this._task = new Task(func);
+        this._scheduler = new Scheduler(cronExpression, options.timezone, options.recoverMissedExecutions);
+
+        this._scheduler.on('scheduled-time-matched', (now) => {
+            this.now(now);
+        });
+
+        if (options.scheduled !== false) {
+            this._scheduler.start();
+        }
+
+        if (options.runOnInit === true) {
+            this.now('init');
+        }
+    }
+
+    now(now = 'manual') {
+        let result = this._task.execute(now);
+        this.emit('task-done', result);
+    }
+
+    start() {
+        this._scheduler.start();
+    }
+
+    stop() {
+        this._scheduler.stop();
+    }
+}
+
+module.exports = ScheduledTask;

server/libs/nodeCron/scheduler.js

@@ -0,0 +1,49 @@
+'use strict';
+
+const EventEmitter = require('events');
+const TimeMatcher = require('./time-matcher');
+
+class Scheduler extends EventEmitter{
+    constructor(pattern, timezone, autorecover){
+        super();
+        this.timeMatcher = new TimeMatcher(pattern, timezone);
+        this.autorecover = autorecover;
+    }
+
+    start(){
+        // clear timeout if exists
+        this.stop();
+
+        let lastCheck = process.hrtime();
+        let lastExecution = this.timeMatcher.apply(new Date());
+
+        const matchTime = () => {
+            const delay = 1000;
+            const elapsedTime = process.hrtime(lastCheck);
+            const elapsedMs = (elapsedTime[0] * 1e9 + elapsedTime[1]) / 1e6;
+            const missedExecutions = Math.floor(elapsedMs / 1000);
+            
+            for(let i = missedExecutions; i >= 0; i--){
+                const date = new Date(new Date().getTime() - i * 1000);
+                let date_tmp = this.timeMatcher.apply(date);
+                if(lastExecution.getTime() < date_tmp.getTime() && (i === 0 || this.autorecover) && this.timeMatcher.match(date)){
+                    this.emit('scheduled-time-matched', date_tmp);
+                    date_tmp.setMilliseconds(0);
+                    lastExecution = date_tmp;
+                }
+            }
+            lastCheck = process.hrtime();
+            this.timeout = setTimeout(matchTime, delay);
+        };
+        matchTime();
+    }
+
+    stop(){
+        if(this.timeout){
+            clearTimeout(this.timeout);
+        }
+        this.timeout = null;
+    }
+}
+
+module.exports = Scheduler;

server/libs/nodeCron/storage.js

@@ -0,0 +1,19 @@
+module.exports = (() => {
+    if(!global.scheduledTasks){
+        global.scheduledTasks = new Map();
+    }
+    
+    return {
+        save: (task) => {
+            if(!task.options){
+                const uuid = require('uuid');
+                task.options = {};
+                task.options.name = uuid.v4();
+            }
+            global.scheduledTasks.set(task.options.name, task);
+        },
+        getTasks: () => {
+            return global.scheduledTasks;
+        }
+    };
+})();

server/libs/nodeCron/task.js

@@ -0,0 +1,34 @@
+'use strict';
+
+const EventEmitter = require('events');
+
+class Task extends EventEmitter{
+    constructor(execution){
+        super();
+        if(typeof execution !== 'function') {
+            throw 'execution must be a function';
+        }
+        this._execution = execution;
+    }
+
+    execute(now) {
+        let exec;
+        try {
+            exec = this._execution(now);
+        } catch (error) {
+            return this.emit('task-failed', error);
+        }
+        
+        if (exec instanceof Promise) {
+            return exec
+                .then(() => this.emit('task-finished'))
+                .catch((error) => this.emit('task-failed', error));
+        } else {
+            this.emit('task-finished');
+            return exec;
+        }
+    }
+}
+
+module.exports = Task;
+

server/libs/nodeCron/time-matcher.js

@@ -0,0 +1,54 @@
+const validatePattern = require('./pattern-validation');
+const convertExpression = require('./convert-expression');
+
+function matchPattern(pattern, value){
+    if( pattern.indexOf(',') !== -1 ){
+        const patterns = pattern.split(',');
+        return patterns.indexOf(value.toString()) !== -1;
+    }
+    return pattern === value.toString();
+}
+
+class TimeMatcher{
+    constructor(pattern, timezone){
+        validatePattern(pattern);
+        this.pattern = convertExpression(pattern);
+        this.timezone = timezone;
+        this.expressions = this.pattern.split(' ');
+    }
+
+    match(date){
+        date = this.apply(date);
+
+        const runOnSecond = matchPattern(this.expressions[0], date.getSeconds());
+        const runOnMinute = matchPattern(this.expressions[1], date.getMinutes());
+        const runOnHour = matchPattern(this.expressions[2], date.getHours());
+        const runOnDay = matchPattern(this.expressions[3], date.getDate());
+        const runOnMonth = matchPattern(this.expressions[4], date.getMonth() + 1);
+        const runOnWeekDay = matchPattern(this.expressions[5], date.getDay());
+
+        return runOnSecond && runOnMinute && runOnHour && runOnDay && runOnMonth && runOnWeekDay;
+    }
+
+    apply(date){
+        if(this.timezone){
+            const dtf = new Intl.DateTimeFormat('en-US', {
+                year: 'numeric',
+                month: '2-digit',
+                day: '2-digit',
+                hour: '2-digit',
+                minute: '2-digit',
+                second: '2-digit',
+                hourCycle: 'h23',
+                fractionalSecondDigits: 3,
+                timeZone: this.timezone
+            });
+            
+            return new Date(dtf.format(date));
+        }
+        
+        return date;
+    }
+}
+
+module.exports = TimeMatcher;

server/managers/BackupManager.js

@@ -1,6 +1,6 @@
 const Path = require('path')
 
-const cron = require('node-cron')
+const cron = require('../libs/nodeCron')
 const fs = require('fs-extra')
 const archiver = require('archiver')
 const StreamZip = require('node-stream-zip')

server/managers/PodcastManager.js

@@ -1,5 +1,5 @@
 const fs = require('fs-extra')
-const cron = require('node-cron')
+const cron = require('../libs/nodeCron')
 const axios = require('axios')
 
 const { parsePodcastRssFeedXml } = require('../utils/podcastUtils')