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Play MIDI tones according to text patterns in log files

aud 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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### Listen to your log files with `aud`

`aud` is an open source utility that plays tones in response to input. Using it is easy:

``` bash
$ tail -f access.log | aud
```

Here's a few things you can use `aud` for:

+ Hear an alert when a log contains an exception.
+ Learn the *rhythm* of a system, like you would a car engine.
+ Sense the relationship between two or more concurrent components.

The human hearing system is remarkably good at [isolating sounds](http://physicsworld.com/cws/article/news/2013/jan/31/human-hearing-is-highly-nonlinear) and detecting patterns. Why not use it to intuit how information-processing systems actually work?

[The Sound of Sorting](http://panthema.net/2013/sound-of-sorting) uses video and sound to *show* you how sorting algorithms work, not just tell you. Bret Victor's talk [Inventing on Principle](http://vimeo.com/36579366) explains why creators need a physical, immediate connection to their creations. These and more inspired me to write `aud`.

### Install aud

`aud` is a Ruby gem, and will work with most Ruby versions. Install it as follows:

``` bash
$ gem install aud
```

Once installed, the `aud` command should be available on your path. You can print aud's help information to be sure.

``` bash
$ aud help listen
```

### Setup a MIDI Input and Output

You won't hear anything until you configure a MIDI input and output. This README includes instructions for Mac OSX, but you can run `aud` on other platforms too. See the [UniMIDI README](https://github.com/arirusso/unimidi) for more information.

##### Mac OSX Instructions

1) *Enable the IAC Driver* - Open "Audio MIDI Setup" in your System Preferences. Choose "Open MIDI Window" from the "Windows" option in the Menu Bar. Double-click on "IAC Driver", and check "Device is online".

2) *Download SimpleSynth* - SimpleSynth will play aloud the signals coming across the IAC Driver virtual MIDI controller. Download it [here](http://notahat.com/simplesynth/) and install it. Run it, and make sure the IAC Driver is selected. (Note: You can also use GarageBand [as described here](http://tx81z.blogspot.com/2011/06/osx-unimidi-and-midi-patch-bay.html).)

(Protip: Turn Channel 2 to "Fl.Key Click" as shown in the screenshot. It sounds cool :)

3) Turn the volume up! Depending on your configuration, MIDI sounds may not be as loud as other sounds.

### Usage

`aud` accepts input via STDIN, just like grep, awk, or sed. That means you can cat, echo, or tail lines of text to it. Here's an example:

``` bash
$ cat access.log | aud
```

If everything is set up correctly, you should hear a note played for each line of the log file.

The pitch, octave, and duration of the note are configurable. Here's the full set of options, taken from `aud help listen`:

``` bash
  -o, [--octave=Set an octave [1-5]]
                                                                      # Default: 3
  -n, [--note=The note to play [A-G]]
                                                                      # Default: C
  -f, [--file=A file to listen to]
  -c, [--channel=Set a MIDI channel [1-16]]
                                                                      # Default: 1
  -d, [--delay=Minimum delay in milliseconds between sounds]
                                                                      # Default: 50
  -s, [--strategy=A strategy for making sounds, currently only tick]
                                                                      # Default: tick
      [--silent=Suppress printing of input]
```

### Real-world examples

##### Web logs

Listen to web logs and get a sense for traffic volume and error rates.

This example plays a short middle C for 200s, a longer B for 404s, and an even longer F for 500s.

##### Distributed or complex systems

I use `aud` to understand and troubleshoot patterns within complex distributed systems, like the kind I work on at [Keen IO](https://keen.io).

Our distributed backend includes [Storm](http://storm-project.net/), [Cassandra](http://cassandra.apache.org/), [Kafka](https://kafka.apache.org/), [Zookeeper](http://zookeeper.apache.org/), and more. These applications form a complex realtime mesh of activity, and generate a *lot* of log files.

I use `ssh` and `aud` as a stethoscope, listening to the rumpus as it happens. I get a better **feeling** for what's happening this way than I could by grepping for multiple pieces of text. As a result, I can detect errors and deviations in performance quickly and with little cognitive effort. As you can imagine, listening for rhythms is way less exhausting than trying to keep up with lines of text as they race by!

### Contributing

Today, `aud` is only a trailhead for exploring the relationship between sound, information systems, and human perception. As such, I heartily invite your comments and contributions.

To hack on `aud`, clone or fork this repository. Then:

``` bash
# install developement dependencies
$ bundle install

# run tests
$ bundle exec rake spec
```

### Credits and Acknowledgements

+ The excellent [UNIMidi gem](https://github.com/arirusso/unimidi) and [micromidi gem](https://github.com/arirusso/micromidi), upon which `aud` is built
+ Bret Victor's jaw-dropping talk [Inventing on Principle](http://vimeo.com/36579366), as inspiration
+ [The Sound of Sorting](http://panthema.net/2013/sound-of-sorting), as inspiration, and [@dkador](https://github.com/dkador) for first sharing it with me

### MIT License

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.

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