enigma-bbs/core/stat_log.js

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JavaScript
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2016-07-28 03:48:13 +00:00
/* jslint node: true */
'use strict';
const sysDb = require('./database.js').dbs.system;
// deps
const _ = require('lodash');
const moment = require('moment');
/*
System Event Log & Stats
------------------------
System & user specific:
* Events for generating various statistics, logs such as last callers, etc.
* Stats such as counters
User specific stats are simply an alternate interface to user properties, while
system wide entries are handled on their own. Both are read accessible non-blocking
making them easily available for MCI codes for example.
*/
class StatLog {
constructor() {
this.systemStats = {};
}
init(cb) {
//
// Load previous state/values of |this.systemStats|
//
const self = this;
sysDb.each(
`SELECT stat_name, stat_value
FROM system_stat;`,
(err, row) => {
if(row) {
self.systemStats[row.stat_name] = row.stat_value;
}
},
err => {
return cb(err);
}
);
}
setNonPeristentSystemStat(statName, statValue) {
this.systemStats[statName] = statValue;
}
setSystemStat(statName, statValue, cb) {
// live stats
this.systemStats[statName] = statValue;
// persisted stats
sysDb.run(
`REPLACE INTO system_stat (stat_name, stat_value)
VALUES (?, ?);`,
[ statName, statValue ],
err => {
// cb optional - callers may fire & forget
if(cb) {
return cb(err);
}
}
);
}
getSystemStat(statName) { return this.systemStats[statName]; }
incrementSystemStat(statName, incrementBy, cb) {
incrementBy = incrementBy || 1;
let newValue = parseInt(this.systemStats[statName]);
if(newValue) {
if(!_.isNumber(newValue)) {
return cb(new Error(`Value for ${statName} is not a number!`));
}
newValue += incrementBy;
} else {
newValue = incrementBy;
}
return this.setSystemStat(statName, newValue, cb);
}
//
// User specific stats
// These are simply convience methods to the user's properties
//
setUserStat(user, statName, statValue, cb) {
// note: cb is optional in PersistUserProperty
return user.persistProperty(statName, statValue, cb);
}
incrementUserStat(user, statName, incrementBy, cb) {
incrementBy = incrementBy || 1;
let newValue = parseInt(user.properties[statName]);
if(newValue) {
if(!_.isNumber(newValue)) {
return cb(new Error(`Value for ${statName} is not a number!`));
}
newValue += incrementBy;
} else {
newValue = incrementBy;
}
return this.setUserStat(user, statName, newValue, cb);
}
// the time "now" in the ISO format we use and love :)
get now() { return moment().format('YYYY-MM-DDTHH:mm:ss.SSSZ'); }
appendSystemLogEntry(logName, logValue, keepDays, cb) {
sysDb.run(
`INSERT INTO system_event_log (timestamp, log_name, log_value)
VALUES (?, ?, ?);`,
[ this.now, logName, logValue ],
() => {
//
// Handle keepDays
//
sysDb.run(
`DELETE FROM system_event_log
WHERE log_name = ? AND timestamp <= DATETIME("now", "-${keepDays} day");`,
[ logName ],
err => {
// cb optional - callers may fire & forget
if(cb) {
return cb(err);
}
}
);
}
);
}
getSystemLogEntries(logName, order, limit, cb) {
let sql =
`SELECT timestamp, log_value
FROM system_event_log
WHERE log_name = ?`;
switch(order) {
case 'timestamp' :
case 'timestamp_desc' :
sql += ' ORDER BY timestamp DESC';
}
if(!cb && _.isFunction(limit)) {
cb = limit;
limit = 0;
} else {
limit = limit || 0;
}
if(0 !== limit) {
sql += ` LIMIT ${limit}`;
}
sql += ';';
sysDb.all(sql, [ logName ], (err, rows) => {
return cb(err, rows);
});
}
appendUserLogEntry(user, logName, logValue, keepDays, cb) {
sysDb.run(
`INSERT INTO user_event_log (timestamp, user_id, log_name, log_value)
VALUES (?, ?, ?, ?);`,
[ this.now, user.userId, logName, logValue ],
() => {
//
// Handle keepDays
//
sysDb.run(
`DELETE FROM user_event_log
WHERE user_id = ? AND log_name = ? AND timestamp <= DATETIME("now", "-${keepDays} day");`,
[ user.userId, logName ],
err => {
// cb optional - callers may fire & forget
if(cb) {
return cb(err);
}
}
);
}
);
}
}
module.exports = new StatLog();