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website/functions/node_modules/@google-cloud/common/src/logger.js

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