qlock

Quick and dirty timestamping.

Install

npm install qlock

Usage

How to log the lifecycle of a series of complex operations:

var Qlock = require('qlock');
var qlk = new Qlock();
 
qlk.log('Starting log');
foo(function(err, result) {
  qlk.log('foo completed');
  bar(function(err, result) {
    qlk.log('bar completed');
  });
});

Prints to console:

Starting log
foo completed - 23ms
bar completed - 443ms

Use profile() to measure a single event. Note that this requires two calls to start and end the event.

qlk.profile('getUser');
getUser(45, function(err, user) {
  qlk.profile('getUser');
});

Which prints:

Start "getUser"
End "getUser" 309ms

API

new qlock(opts)

Instantiates a new qlock logger. For production use, it's recommended to mute qlock, which effectively turns all functionality into no-ops.

• opts - An object containing instantiation options
  • mute - Pass in a truthy value to mute qlock.

===

log(description, [callback])

This method is used to log consecutive events. The first log() will initiate the first timestamp whereas consecutive calls to log() will log the timestamp difference since the last event.

Arguments

• description - A description of the event being logged
• callback(description, diff) - An optional callback function to customize logging behavior. The diff measures time since last event in milliseconds. Omitting this callback will simply print the description and diff to the console.

===

reset()

Resets the timestamp for log(), the following log() will be relative to when this is invoked.

===

profile(name, [callback])

Profile a single event by a unique name. The first profile() will start recording , while the second will end it. Ensure that all profiled events are ended otherwise it could leak memory if events just pile up and never get completed.

Arguments

• name - A string to index an event.
• callback(name, diff) - An optional callback function to customize logging behavior.

===

License

The MIT License (MIT)

Copyright (c) 2014 Preston Pham

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.