hook.io is a versatile distributed event emitter built with node.js
hooks are nodes which can seamlessly work together across any device or network to create self-healing meshes of i/o
- Build applications intelligently by combining together small hook actors
- Rapidly compose new functionality in a distributed and organized way
- Dead simple Inter Process Communication built on-top of node's native EventEmitter class
- Supports a large amount of common i/o sources out of the box
- Additional i/o support from a rich community and network of user-created hook libraries
- Built-in auto-discovery systems using http, tcp, mdns, and hnet
- Seamlessly manages the spawning and daemonizing additional hooks
- Legacy applications can easily be extended to work with hook.io
[sudo] npm install hook.io -g
If you are impatient and wish to jump straight to code, we have hundreds of code examples available here: https://github.com/hookio/hook.io/tree/master/examples
- using hook.io as a node.js script or as the hook binary
- hook.io repl
- hook configuration / construction
- using PIPES
- using mdns
- enabling autohealing meshes
- tapping into the hook.io library network
How to use hook.io as a node.js script or as the
hook.io works well as both the
hook binary or required and used programmatically through node.js
To use the
hook binary simple type this on your terminal:
This will start up your first hook!
To execute this same action programtically we would create a myhook.js file that contained:
var hookio = require('hook.io'), hook = hookio.createHook(); hook.start();
The hook repl provides an easy way to interact with a live hook.io mesh.
repl img here
Note: This is only one, small, example.
To see all other supported types of hook messaging ( including EventEmitter and Callback style ), see: https://github.com/hookio/hook.io/tree/master/examples/messaging
var hookio = ;var hookA = hookio;hookA;hookAstart;
var hookB = hookio;hookB;hookBstart;
piping stdout and stdin through unix pipes
pipe stdin to hookio
tail foo.txt -f | hook
hook.io will now emit stdin data as separate hook events
pipe hook.io events to stdout
hook -p | less
-p option, hook.io will stream events to stdout as
\n delimited JSON documents. Each document represents a single hook event.
multicast dns ( mdns )
Multicast DNS (mdns) is a way of using DNS programming interfaces, packet formats and operating semantics on a small network where no DNS server is running. The mDNS protocol is used by Apple's Bonjour and Linux Avahi service discovery systems. mdns is an easy way to help networked devices find each other without any prior configuration.
hook.io has built-in experimental mdns support. This is intended to work on all operating systems and is intented for a way to providezero configuration networking discovery and connection of hooks over a Local Area Network ( LAN )
Before you can use the mdns feature, you will need to install a few additional dependencies.
npm install firstname.lastname@example.org
MacOS and Windows should work out of the box. If you are running Linux, you may need to install the following libraries.
apt-get install libavahi-compat-libdnssd-dev
Now these two computers ( connected over a LAN, with no central DNS server ) will automatically discovery each other and begin to transmit messages. Think of the possibilities!
You can also search http://search.npmjs.org/ for "hook.io" ( although there are so many matches already, the search interface can't display them all.. )
All tests are written with vows and require that you link hook.io to itself:
$ cd /path/to/hook.io$ [sudo] npm link$ [sudo] npm link hook.io$ npm test
- Email List: http://groups.google.com/group/hookio
- Video Lessons: http://youtube.com/maraksquires ( mirror )
- Wiki Pages https://github.com/hookio/hook.io/wiki/_pages
- hook.io for dummies
- Distribute Node.js Apps with hook.io:
- #nodejitsu on irc.freenode.net
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