Icard/angular-clarity-master(work.../node_modules/log4js/lib/log4js.js

187 lines
4.8 KiB
JavaScript

/**
* @fileoverview log4js is a library to log in JavaScript in similar manner
* than in log4j for Java (but not really).
*
* <h3>Example:</h3>
* <pre>
* const logging = require('log4js');
* const log = logging.getLogger('some-category');
*
* //call the log
* log.trace('trace me' );
* </pre>
*
* NOTE: the authors below are the original browser-based log4js authors
* don't try to contact them about bugs in this version :)
* @author Stephan Strittmatter - http://jroller.com/page/stritti
* @author Seth Chisamore - http://www.chisamore.com
* @since 2005-05-20
* Website: http://log4js.berlios.de
*/
const debug = require('debug')('log4js:main');
const fs = require('fs');
const deepClone = require('rfdc')({ proto: true });
const configuration = require('./configuration');
const layouts = require('./layouts');
const levels = require('./levels');
const appenders = require('./appenders');
const categories = require('./categories');
const Logger = require('./logger');
const clustering = require('./clustering');
const connectLogger = require('./connect-logger');
const recordingModule = require('./appenders/recording');
let enabled = false;
function sendLogEventToAppender(logEvent) {
if (!enabled) return;
debug('Received log event ', logEvent);
const categoryAppenders = categories.appendersForCategory(
logEvent.categoryName
);
categoryAppenders.forEach((appender) => {
appender(logEvent);
});
}
function loadConfigurationFile(filename) {
debug(`Loading configuration from ${filename}`);
try {
return JSON.parse(fs.readFileSync(filename, 'utf8'));
} catch (e) {
throw new Error(
`Problem reading config from file "${filename}". Error was ${e.message}`,
e
);
}
}
function configure(configurationFileOrObject) {
if (enabled) {
// eslint-disable-next-line no-use-before-define
shutdown();
}
let configObject = configurationFileOrObject;
if (typeof configObject === 'string') {
configObject = loadConfigurationFile(configurationFileOrObject);
}
debug(`Configuration is ${configObject}`);
configuration.configure(deepClone(configObject));
clustering.onMessage(sendLogEventToAppender);
enabled = true;
// eslint-disable-next-line no-use-before-define
return log4js;
}
function isConfigured() {
return enabled;
}
function recording() {
return recordingModule;
}
/**
* This callback type is called `shutdownCallback` and is displayed as a global symbol.
*
* @callback shutdownCallback
* @param {Error} [error]
*/
/**
* Shutdown all log appenders. This will first disable all writing to appenders
* and then call the shutdown function each appender.
*
* @param {shutdownCallback} [callback] - The callback to be invoked once all appenders have
* shutdown. If an error occurs, the callback will be given the error object
* as the first argument.
*/
function shutdown(callback = () => {}) {
if (typeof callback !== 'function') {
throw new TypeError('Invalid callback passed to shutdown');
}
debug('Shutdown called. Disabling all log writing.');
// First, disable all writing to appenders. This prevents appenders from
// not being able to be drained because of run-away log writes.
enabled = false;
// Clone out to maintain a reference
const appendersToCheck = Array.from(appenders.values());
// Reset immediately to prevent leaks
appenders.init();
categories.init();
// Count the number of shutdown functions
const shutdownFunctions = appendersToCheck.reduce(
(accum, next) => (next.shutdown ? accum + 1 : accum),
0
);
if (shutdownFunctions === 0) {
debug('No appenders with shutdown functions found.');
callback();
}
let completed = 0;
let error;
debug(`Found ${shutdownFunctions} appenders with shutdown functions.`);
function complete(err) {
error = error || err;
completed += 1;
debug(`Appender shutdowns complete: ${completed} / ${shutdownFunctions}`);
if (completed >= shutdownFunctions) {
debug('All shutdown functions completed.');
callback(error);
}
}
// Call each of the shutdown functions
appendersToCheck
.filter((a) => a.shutdown)
.forEach((a) => a.shutdown(complete));
}
/**
* Get a logger instance.
* @static
* @param {string} [category=default]
* @return {Logger} instance of logger for the category
*/
function getLogger(category) {
if (!enabled) {
configure(
process.env.LOG4JS_CONFIG || {
appenders: { out: { type: 'stdout' } },
categories: { default: { appenders: ['out'], level: 'OFF' } },
}
);
}
return new Logger(category || 'default');
}
/**
* @name log4js
* @namespace Log4js
* @property getLogger
* @property configure
* @property shutdown
*/
const log4js = {
getLogger,
configure,
isConfigured,
shutdown,
connectLogger,
levels,
addLayout: layouts.addLayout,
recording,
};
module.exports = log4js;