/
logger.ts
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/
logger.ts
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import { format } from 'util';
import { MongoInvalidArgumentError } from './error';
import { enumToString } from './utils';
// Filters for classes
const classFilters: any = {};
let filteredClasses: any = {};
let level: LoggerLevel;
// Save the process id
const pid = process.pid;
// current logger
// eslint-disable-next-line no-console
let currentLogger: LoggerFunction = console.warn;
/** @public */
export const LoggerLevel = Object.freeze({
ERROR: 'error',
WARN: 'warn',
INFO: 'info',
DEBUG: 'debug',
error: 'error',
warn: 'warn',
info: 'info',
debug: 'debug'
} as const);
/** @public */
export type LoggerLevel = typeof LoggerLevel[keyof typeof LoggerLevel];
/** @public */
export type LoggerFunction = (message?: any, ...optionalParams: any[]) => void;
/** @public */
export interface LoggerOptions {
logger?: LoggerFunction;
loggerLevel?: LoggerLevel;
}
/**
* @public
*/
export class Logger {
className: string;
/**
* Creates a new Logger instance
*
* @param className - The Class name associated with the logging instance
* @param options - Optional logging settings
*/
constructor(className: string, options?: LoggerOptions) {
options = options ?? {};
// Current reference
this.className = className;
// Current logger
if (!(options.logger instanceof Logger) && typeof options.logger === 'function') {
currentLogger = options.logger;
}
// Set level of logging, default is error
if (options.loggerLevel) {
level = options.loggerLevel || LoggerLevel.ERROR;
}
// Add all class names
if (filteredClasses[this.className] == null) {
classFilters[this.className] = true;
}
}
/**
* Log a message at the debug level
*
* @param message - The message to log
* @param object - Additional meta data to log
*/
debug(message: string, object?: unknown): void {
if (
this.isDebug() &&
((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className]) ||
(Object.keys(filteredClasses).length === 0 && classFilters[this.className]))
) {
const dateTime = new Date().getTime();
const msg = format('[%s-%s:%s] %s %s', 'DEBUG', this.className, pid, dateTime, message);
const state = {
type: LoggerLevel.DEBUG,
message,
className: this.className,
pid,
date: dateTime
} as any;
if (object) state.meta = object;
currentLogger(msg, state);
}
}
/**
* Log a message at the warn level
*
* @param message - The message to log
* @param object - Additional meta data to log
*/
warn(message: string, object?: unknown): void {
if (
this.isWarn() &&
((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className]) ||
(Object.keys(filteredClasses).length === 0 && classFilters[this.className]))
) {
const dateTime = new Date().getTime();
const msg = format('[%s-%s:%s] %s %s', 'WARN', this.className, pid, dateTime, message);
const state = {
type: LoggerLevel.WARN,
message,
className: this.className,
pid,
date: dateTime
} as any;
if (object) state.meta = object;
currentLogger(msg, state);
}
}
/**
* Log a message at the info level
*
* @param message - The message to log
* @param object - Additional meta data to log
*/
info(message: string, object?: unknown): void {
if (
this.isInfo() &&
((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className]) ||
(Object.keys(filteredClasses).length === 0 && classFilters[this.className]))
) {
const dateTime = new Date().getTime();
const msg = format('[%s-%s:%s] %s %s', 'INFO', this.className, pid, dateTime, message);
const state = {
type: LoggerLevel.INFO,
message,
className: this.className,
pid,
date: dateTime
} as any;
if (object) state.meta = object;
currentLogger(msg, state);
}
}
/**
* Log a message at the error level
*
* @param message - The message to log
* @param object - Additional meta data to log
*/
error(message: string, object?: unknown): void {
if (
this.isError() &&
((Object.keys(filteredClasses).length > 0 && filteredClasses[this.className]) ||
(Object.keys(filteredClasses).length === 0 && classFilters[this.className]))
) {
const dateTime = new Date().getTime();
const msg = format('[%s-%s:%s] %s %s', 'ERROR', this.className, pid, dateTime, message);
const state = {
type: LoggerLevel.ERROR,
message,
className: this.className,
pid,
date: dateTime
} as any;
if (object) state.meta = object;
currentLogger(msg, state);
}
}
/** Is the logger set at info level */
isInfo(): boolean {
return level === LoggerLevel.INFO || level === LoggerLevel.DEBUG;
}
/** Is the logger set at error level */
isError(): boolean {
return level === LoggerLevel.ERROR || level === LoggerLevel.INFO || level === LoggerLevel.DEBUG;
}
/** Is the logger set at error level */
isWarn(): boolean {
return (
level === LoggerLevel.ERROR ||
level === LoggerLevel.WARN ||
level === LoggerLevel.INFO ||
level === LoggerLevel.DEBUG
);
}
/** Is the logger set at debug level */
isDebug(): boolean {
return level === LoggerLevel.DEBUG;
}
/** Resets the logger to default settings, error and no filtered classes */
static reset(): void {
level = LoggerLevel.ERROR;
filteredClasses = {};
}
/** Get the current logger function */
static currentLogger(): LoggerFunction {
return currentLogger;
}
/**
* Set the current logger function
*
* @param logger - Custom logging function
*/
static setCurrentLogger(logger: LoggerFunction): void {
if (typeof logger !== 'function') {
throw new MongoInvalidArgumentError('Current logger must be a function');
}
currentLogger = logger;
}
/**
* Filter log messages for a particular class
*
* @param type - The type of filter (currently only class)
* @param values - The filters to apply
*/
static filter(type: string, values: string[]): void {
if (type === 'class' && Array.isArray(values)) {
filteredClasses = {};
values.forEach(x => (filteredClasses[x] = true));
}
}
/**
* Set the current log level
*
* @param newLevel - Set current log level (debug, warn, info, error)
*/
static setLevel(newLevel: LoggerLevel): void {
if (
newLevel !== LoggerLevel.INFO &&
newLevel !== LoggerLevel.ERROR &&
newLevel !== LoggerLevel.DEBUG &&
newLevel !== LoggerLevel.WARN
) {
throw new MongoInvalidArgumentError(
`Argument "newLevel" should be one of ${enumToString(LoggerLevel)}`
);
}
level = newLevel;
}
}