@frangoteam/fuxa/runtime/notificator/notifystorage.js

Web-based Process Visualization (SCADA/HMI/Dashboard) software

/**
 *  Module to manage the notifications in a database
 *  Table: 'alarms', 'chronicle'
 */


'use strict';

const fs = require('fs');
const path = require('path');
var sqlite3 = require('sqlite3').verbose();

var settings            // Application settings
var logger;             // Application logger
var db_notifications;   // Database of notifications

/**
 * Init and bind the database resource
 * @param {*} _settings 
 * @param {*} _log 
 */
function init(_settings, _log) {
    settings = _settings;
    logger = _log;

    return _bind();
}

/**
 * Bind the database resource by create the table if not exist
 */
function _bind() {
    return new Promise(function (resolve, reject) {
        var dbfile = path.join(settings.workDir, 'notifications.fuxap.db');
        var dbfileExist = fs.existsSync(dbfile);

        db_notifications = new sqlite3.Database(dbfile, function (err) {
            if (err) {
                logger.error('notifystorage.failed-to-bind: ' + err);
                reject();
            }
            logger.info('notifystorage.connected-to ' + dbfile + ' database.', true);
        });
        // prepare query
        // var sql = "CREATE TABLE if not exists notifications (id TEXT PRIMARY KEY, name TEXT, type TEXT, ontime INTEGER, notifytime INTEGER, notifytype TEXT, options TEXT);";
        var sql = "CREATE TABLE if not exists chronicle (Sn INTEGER, id TEXT, name TEXT, type TEXT, receiver TEXT, text TEXT, notifytime INTEGER, notifytype TEXT, PRIMARY KEY(Sn AUTOINCREMENT));";
        db_notifications.exec(sql, function (err) {
            if (err) {
                logger.error('notifystorage.failed-to-bind: ' + err);
                reject();
            } else {
                resolve(dbfileExist);
            }
        });
    });
}

/**
 * Clear all Notifications from table
 */
function clearNotifications(all) {
    return new Promise(function (resolve, reject) {
        var sql = "DELETE FROM notifications;";
        if (all) {
            sql += "DELETE FROM chronicle;";
        }
        db_notifications.exec(sql, function (err, rows) {
            if (err) {
                reject(err);
            } else {
                resolve(rows);
            }
        });
    });
}

/**
 * Return the Notifications list
 */
function getNotifications() {
    return new Promise(function (resolve, reject) {
        if (!db_notifications) {
            reject(false);
        } else {
            var sql = "SELECT * FROM notifications";
            db_notifications.all(sql, function (err, rows) {
                if (err) {
                    reject(err);
                } else {
                    resolve(rows);
                }
            });
        }
    });
}

/**
 * Return the Notifications history
 */
 function getNotificationsHistory(from, to) {
    return new Promise(function (resolve, reject) {
        if (!db_notifications) {
            reject(false);
        } else {
            // var sql = "SELECT * FROM history WHERE dt BETWEEN ? and ? ORDER BY dt ASC";
            // db_notifications.all(sql, [from, to], function (err, rows) {
            var sql = "SELECT * FROM chronicle ORDER BY ontime DESC";
            db_notifications.all(sql, function (err, rows) {
                if (err) {
                    reject(err);
                } else {
                    resolve(rows);
                }
            });
        }
    });
}

/**
 * Set Notifications value in database
 */
function setNotification(notification) {
    return new Promise(function (resolve, reject) {
        // prepare query
        if (notification) {
            var sql = "";
            //is notification is changed insert or update record
            // sql += "INSERT OR REPLACE INTO notifications (id, name, type, ontime, notifytime, notifytype) VALUES('" + notification.id + "','" + 
            //         notification.type + "','" + notification.name + "','" + notification.ontime + "','" + notification.notifytime + "','" + notification.notifytype + "');";
            sql += "INSERT OR REPLACE INTO chronicle (id, name, type, receiver, text, notifytime, notifytype) VALUES('" +
                notification.id + "','" + notification.name + "','" + notification.type + "','" + notification.receiver + "','" + 
                notification.text + "','" + notification.notifytime + "','" + notification.notifytype + "');";
            db_notifications.exec(sql, function (err) {
                if (err) {
                    logger.error('notifystorage.failed-to-set: ' + err);
                    reject();
                } else {
                    resolve();
                }
            });
        }
    });
}

/**
 * Close the database
 */
function close() {
    if (db_notifications) {
        db_notifications.close();
    }
}

/**
 * Remove Notification from database
 */
 function removeNotification(notification) {
    return new Promise(function (resolve, reject) {
        // prepare query
        var sql = "DELETE FROM notifications WHERE id = '" + notification.id + "'";
        db_notifications.exec(sql, function (err) {
            if (err) {
                logger.error('notificationsstorage.failed-to-remove: ' + err);
                reject();
            } else {
                resolve();
            }
        });
    });
}

module.exports = {
    init: init,
    close: close,
    getNotifications: getNotifications,
    getNotificationsHistory: getNotificationsHistory,
    setNotification: setNotification,
    clearNotifications: clearNotifications,
    removeNotification: removeNotification
};