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logger.js
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logger.js
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"use strict";
const locreq = require("locreq")(__dirname);
const winston = require("winston");
const ConfigManager = locreq("lib/config/config-manager.js");
/*
This is the default configration of Sealious logger.
To retrieve a specifig setting, use "get_config()" function, ex. "ConfigManager.get_config().logger_config.logger_level".
@logger_level - specifies from which log level (displayed below) onward should be displayed,
@logger_color - specifies if the log should be colorized, values "true" or "false"
@logger_file - defines a filename to save the logs, if a falsy value is given the logs will not be saved,
@logger_dirname - defines a default path to save the logs,
@logger_to_json - specifies the format of the saved logs,
@logger_rotation - defines the log rotation format, set to daily by default
*/
ConfigManager.set_default_config(
"logger_config", {
logger_level: "info",
logger_color: true,
logger_file: null,
logger_dirname: ".",
logger_to_json: false,
logger_rotation: ".yyyy-MM-Tdd",
});
/*
This is the custom logger level and color configuration.
@levels - default logger levels, 0 being the lowest importance, 4 being the highest:
* lazyseal - an Easter, or should we say: Sealious egg. Used only for humorous reasons, the lowest level of importance, default color: white,
* info - used for stating the current status or general information such as starting the server, default color: green,
* debug - used for debugging, default color: blue,
* warning - used to display warnings, default color: yellow,
* error - used to display errors, default color: red
*/
const custom = {
levels: {
lazyseal: 0,
info: 1,
debug: 2,
warning: 3,
error: 4,
no_output: 5,
},
colors: {
lazyseal: "white",
info: "green",
debug: "blue",
warning: "yellow",
error: "red",
},
};
/*
Returns the current date and time, default format: "yyyy-mm-dd hh:mm:ss.mmm", ex. "2000-01-01 20:00:00.000"
*/
function getDateTime (with_date){
const date = new Date();
let hour = date.getHours();
hour = (hour < 10 ? "0" : "") + hour;
let min = date.getMinutes();
min = (min < 10 ? "0" : "") + min;
let sec = date.getSeconds();
sec = (sec < 10 ? "0" : "") + sec;
let milli = date.getMilliseconds();
milli = (milli < 10 ? "00" : "") + milli;
milli = (milli < 100 && milli >= 10 ? "0" : "") + milli;
const year = date.getFullYear();
let month = date.getMonth() + 1;
month = (month < 10 ? "0" : "") + month;
let day = date.getDate();
day = (day < 10 ? "0" : "") + day;
if (!with_date){
return hour + ":" + min + ":" + sec + "." + milli;
} else {
return year + "-" + month + "-" + day + " " + hour + ":" + min + ":" + sec + "." + milli;
}
}
const transports_array = [];
const logger_level = ConfigManager.get_config().logger_config.logger_level;
const logger_color = ConfigManager.get_config().logger_config.logger_color;
const logger_file = ConfigManager.get_config().logger_config.logger_file;
const logger_dirname = ConfigManager.get_config().logger_config.logger_dirname;
const logger_to_json = ConfigManager.get_config().logger_config.logger_to_json;
const logger_rotation = ConfigManager.get_config().logger_config.logger_rotation;
const winston_level = new(winston.transports.Console)({
level: logger_level,
colorize: logger_color,
timestamp: function(){
return getDateTime(false);
},
});
transports_array.push(winston_level);
if (logger_file){
const winston_save_to_file = new(winston.transports.File)({
filename: logger_file,
colorize: logger_color,
timestamp: function(){
return getDateTime(true);
},
dirname: logger_dirname,
json: logger_to_json,
});
const winston_daily_rotate = new(winston.transports.DailyRotateFile)({
filename: logger_file,
datePattern: logger_rotation,
});
transports_array.push(winston_save_to_file);
transports_array.push(winston_daily_rotate);
}
const logger = new winston.Logger({
levels: custom.levels,
colors: custom.colors,
transports: transports_array,
});
logger.rewriters.push(function(level, msg, meta){
if (Object.keys(meta).length){
let message = "\n";
for (const prop in meta){
message += " - " + prop + ": " + JSON.stringify(meta[prop]) + "\n";
}
meta = message;
}
return meta;
});
module.exports = logger;

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