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72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
/*!
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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/*!
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* @module common/logger
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*/
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const format = require('string-format-obj');
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const is = require('is');
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const logDriver = require('log-driver');
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/**
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* The default list of log levels.
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* @type {string[]}
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*/
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const LEVELS = ['silent', 'error', 'warn', 'info', 'debug', 'silly'];
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/**
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* Create a logger to print output to the console.
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*
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* @param {string=|object=} options - Configuration object. If a string, it is
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* treated as `options.level`.
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* @param {string=} options.level - The minimum log level that will print to the
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* console. (Default: `error`)
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* @param {Array.<string>=} options.levels - The list of levels to use. (Default:
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* logger.LEVELS)
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* @param {string=} options.tag - A tag to use in log messages.
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*/
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function logger(options) {
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if (is.string(options)) {
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options = {
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level: options,
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};
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}
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options = options || {};
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return logDriver({
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levels: options.levels || LEVELS,
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level: options.level || 'error',
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format: function() {
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const args = [].slice.call(arguments);
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return format('{level}{tag} {message}', {
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level: args.shift().toUpperCase(),
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tag: options.tag ? ':' + options.tag + ':' : '',
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message: args.join(' '),
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});
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},
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});
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}
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module.exports = logger;
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module.exports.LEVELS = LEVELS;
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