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common.js
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common.js
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/*
* common.js: Internal helper and utility functions for winston
*
* (C) 2010 Charlie Robbins
* MIT LICENCE
*
*/
var util = require('util'),
crypto = require('crypto'),
cycle = require('cycle'),
config = require('./config');
//
// ### function setLevels (target, past, current)
// #### @target {Object} Object on which to set levels.
// #### @past {Object} Previous levels set on target.
// #### @current {Object} Current levels to set on target.
// Create functions on the target objects for each level
// in current.levels. If past is defined, remove functions
// for each of those levels.
//
exports.setLevels = function (target, past, current, isDefault) {
if (past) {
Object.keys(past).forEach(function (level) {
delete target[level];
});
}
target.levels = current || config.npm.levels;
if (target.padLevels) {
target.levelLength = exports.longestElement(Object.keys(target.levels));
}
//
// Define prototype methods for each log level
// e.g. target.log('info', msg) <=> target.info(msg)
//
Object.keys(target.levels).forEach(function (level) {
target[level] = function (msg) {
var args = Array.prototype.slice.call(arguments),
callback = typeof args[args.length - 1] === 'function' || !args[args.length - 1] ? args.pop() : null,
meta = args.length === 2 ? args.pop() : null;
return target.log(level, msg, meta, callback);
};
});
return target;
};
//
// ### function longestElement
// #### @xs {Array} Array to calculate against
// Returns the longest element in the `xs` array.
//
exports.longestElement = function (xs) {
return Math.max.apply(
null,
xs.map(function (x) { return x.length; })
);
};
//
// ### function clone (obj)
// #### @obj {Object} Object to clone.
// Helper method for deep cloning pure JSON objects
// i.e. JSON objects that are either literals or objects (no Arrays, etc)
//
exports.clone = function (obj) {
// we only need to clone refrence types (Object)
if (!(obj instanceof Object)) {
return obj;
}
else if (obj instanceof Date) {
return obj;
}
var copy = {};
for (var i in obj) {
if (Array.isArray(obj[i])) {
copy[i] = obj[i].slice(0);
}
else if (obj[i] instanceof Buffer) {
copy[i] = obj[i].slice(0);
}
else if (typeof obj[i] != 'function') {
copy[i] = obj[i] instanceof Object ? exports.clone(obj[i]) : obj[i];
}
}
return copy;
};
//
// ### function log (options)
// #### @options {Object} All information about the log serialization.
// Generic logging function for returning timestamped strings
// with the following options:
//
// {
// level: 'level to add to serialized message',
// message: 'message to serialize',
// meta: 'additional logging metadata to serialize',
// colorize: false, // Colorizes output (only if `.json` is false)
// timestamp: true // Adds a timestamp to the serialized message
// }
//
exports.log = function (options) {
var timestampFn = typeof options.timestamp === 'function'
? options.timestamp
: exports.timestamp,
timestamp = options.timestamp ? timestampFn() : null,
meta = options.meta ? exports.clone(cycle.decycle(options.meta)) : null,
output;
//
// raw mode is intended for outputing winston as streaming JSON to STDOUT
//
if (options.raw) {
if (typeof meta !== 'object' && meta != null) {
meta = { meta: meta };
}
output = exports.clone(meta) || {};
output.level = options.level;
output.message = options.message.stripColors;
return JSON.stringify(output);
}
//
// json mode is intended for pretty printing multi-line json to the terminal
//
if (options.json) {
if (typeof meta !== 'object' && meta != null) {
meta = { meta: meta };
}
output = exports.clone(meta) || {};
output.level = options.level;
output.message = options.message;
if (timestamp) {
output.timestamp = timestamp;
}
if (typeof options.stringify === 'function') {
return options.stringify(output);
}
return JSON.stringify(output, function (key, value) {
return value instanceof Buffer
? value.toString('base64')
: value;
});
}
output = timestamp ? timestamp + ' - ' : '';
output += options.colorize ? config.colorize(options.level) : options.level;
output += (': ' + options.message);
if (meta) {
if (typeof meta !== 'object') {
output += ' ' + meta;
}
else if (Object.keys(meta).length > 0) {
output += ' ' + (options.prettyPrint ? ('\n' + util.inspect(meta, false, null, options.colorize)) : exports.serialize(meta));
}
}
return output;
};
exports.capitalize = function (str) {
return str && str[0].toUpperCase() + str.slice(1);
};
//
// ### function hash (str)
// #### @str {string} String to hash.
// Utility function for creating unique ids
// e.g. Profiling incoming HTTP requests on the same tick
//
exports.hash = function (str) {
return crypto.createHash('sha1').update(str).digest('hex');
};
//
// ### function pad (n)
// Returns a padded string if `n < 10`.
//
exports.pad = function (n) {
return n < 10 ? '0' + n.toString(10) : n.toString(10);
};
//
// ### function timestamp ()
// Returns a timestamp string for the current time.
//
exports.timestamp = function () {
return new Date().toISOString();
};
//
// ### function serialize (obj, key)
// #### @obj {Object|literal} Object to serialize
// #### @key {string} **Optional** Optional key represented by obj in a larger object
// Performs simple comma-separated, `key=value` serialization for Loggly when
// logging to non-JSON inputs.
//
exports.serialize = function (obj, key) {
if (obj === null) {
obj = 'null';
}
else if (obj === undefined) {
obj = 'undefined';
}
else if (obj === false) {
obj = 'false';
}
if (typeof obj !== 'object') {
return key ? key + '=' + obj : obj;
}
if (obj instanceof Buffer) {
return key ? key + '=' + obj.toString('base64') : obj.toString('base64');
}
var msg = '',
keys = Object.keys(obj),
length = keys.length;
for (var i = 0; i < length; i++) {
if (Array.isArray(obj[keys[i]])) {
msg += keys[i] + '=[';
for (var j = 0, l = obj[keys[i]].length; j < l; j++) {
msg += exports.serialize(obj[keys[i]][j]);
if (j < l - 1) {
msg += ', ';
}
}
msg += ']';
}
else if (obj[keys[i]] instanceof Date) {
msg += keys[i] + '=' + obj[keys[i]];
}
else {
msg += exports.serialize(obj[keys[i]], keys[i]);
}
if (i < length - 1) {
msg += ', ';
}
}
return msg;
};
//
// ### function format (arr)
// #### @arr {Array} The array that contains all parts of the message
// similar to util.format
// returns the formated string
// uses the original array and removes items as it proceeds
//
exports.format = function (arr) {
var msg = arr.shift();
if (typeof msg !== "string") {
return msg;
}
return msg.replace(/%[sdj%]/g, function (x){
switch (x.charAt(1)) {
case "j": return JSON.stringify(arr.shift());
case "s": return String(arr.shift());
case "d": return Number(arr.shift());
case "%": return "%";
default: return x;
}
});
};