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const debug = require('debug')('log4js:multiFile');
const path = require('path');
const fileAppender = require('./file');
const findFileKey = (property, event) =>
event[property] || event.context[property];
module.exports.configure = (config, layouts) => {
debug('Creating a multi-file appender');
const files = new Map();
const timers = new Map();
function checkForTimeout(fileKey) {
const timer = timers.get(fileKey);
const app = files.get(fileKey);
/* istanbul ignore else: failsafe */
if (timer && app) {
if (Date.now() - timer.lastUsed > timer.timeout) {
debug('%s not used for > %d ms => close', fileKey, timer.timeout);
clearInterval(timer.interval);
timers.delete(fileKey);
files.delete(fileKey);
app.shutdown((err) => {
if (err) {
debug('ignore error on file shutdown: %s', err.message);
}
});
}
} else {
// will never get here as files and timers are coupled to be added and deleted at same place
debug('timer or app does not exist');
}
}
const appender = (logEvent) => {
const fileKey = findFileKey(config.property, logEvent);
debug('fileKey for property ', config.property, ' is ', fileKey);
if (fileKey) {
let file = files.get(fileKey);
debug('existing file appender is ', file);
if (!file) {
debug('creating new file appender');
config.filename = path.join(config.base, fileKey + config.extension);
file = fileAppender.configure(config, layouts);
files.set(fileKey, file);
if (config.timeout) {
debug('creating new timer');
timers.set(fileKey, {
timeout: config.timeout,
lastUsed: Date.now(),
interval: setInterval(
checkForTimeout.bind(null, fileKey),
config.timeout
),
});
}
} else if (config.timeout) {
debug('%s extending activity', fileKey);
timers.get(fileKey).lastUsed = Date.now();
}
file(logEvent);
} else {
debug('No fileKey for logEvent, quietly ignoring this log event');
}
};
appender.shutdown = (cb) => {
let shutdownFunctions = files.size;
if (shutdownFunctions <= 0) {
cb();
}
let error;
timers.forEach((timer, fileKey) => {
debug('clearing timer for ', fileKey);
clearInterval(timer.interval);
});
files.forEach((app, fileKey) => {
debug('calling shutdown for ', fileKey);
app.shutdown((err) => {
error = error || err;
shutdownFunctions -= 1;
if (shutdownFunctions <= 0) {
cb(error);
}
});
});
};
return appender;
};