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configuration.js
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configuration.js
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const util = require('util');
const debug = require('debug')('log4js:configuration');
const preProcessingListeners = [];
const listeners = [];
const not = thing => !thing;
const anObject = thing => thing && typeof thing === 'object' && !Array.isArray(thing);
const validIdentifier = thing => /^[A-Za-z][A-Za-z0-9_]*$/g.test(thing);
const anInteger = thing => thing && typeof thing === 'number' && Number.isInteger(thing);
const addListener = (fn) => {
listeners.push(fn);
debug(`Added listener, now ${listeners.length} listeners`);
};
const addPreProcessingListener = (fn) => {
preProcessingListeners.push(fn);
debug(`Added pre-processing listener, now ${preProcessingListeners.length} listeners`);
};
const throwExceptionIf = (config, checks, message) => {
const tests = Array.isArray(checks) ? checks : [checks];
tests.forEach((test) => {
if (test) {
throw new Error(
`Problem with log4js configuration: (${util.inspect(config, {
depth: 5,
})}) - ${message}`
);
}
});
};
const configure = (candidate) => {
debug('New configuration to be validated: ', candidate);
throwExceptionIf(candidate, not(anObject(candidate)), 'must be an object.');
debug(`Calling pre-processing listeners (${preProcessingListeners.length})`);
preProcessingListeners.forEach(listener => listener(candidate));
debug('Configuration pre-processing finished.');
debug(`Calling configuration listeners (${listeners.length})`);
listeners.forEach(listener => listener(candidate));
debug('Configuration finished.');
};
module.exports = {
configure,
addListener,
addPreProcessingListener,
throwExceptionIf,
anObject,
anInteger,
validIdentifier,
not
};