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