Websockets and Ruby EventMachine
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The basics of a WebSockets server in Ruby EventMachine and your own custom JSON protocol for Events-centric WebSockets programming. See more at http://blog.new-bamboo.co.uk/2010/2/10/json-event-based-convention-websockets
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Editor's Notes
- - WebSockets is a HTML5 standard for server-browser persistent connections - Bidirectional - Less overhead than polling and long-polling
- - callbacks
- - Browser sends &#x201C;Upgrade&#x201D; request. - Server &#x201C;upgrades&#x201D; connection to persistent TCP socket. - No more headers sent.
- - &#x201C;messages&#x201D; delimited by these hex characters (null and termination) - incoming message triggers &#x201C;onmessage&#x201D;. - &#x201C;send&#x201D; method wraps messages internally
- - listent - send
- - Server requirements - Threads: memory bloat
- - EventMachine: evented, non-blocking Network connections - predefined callbacks: post_init, receive_data - implement servers (HTTP, WebSockets, others)
- - EM-WebSocket extension by Ilya Grigorik - Implements WS server, handshake - WS API callbacks open, message, close
- - Send messages back to clients
- - store new connections - send message to each connection
- - you can structure you messages however you want. - pick the right protocol for your domain - or design your own
- - custom JSON format: [event, custom_data] - simple standard for client-side events
- - structured JSON messages allow neat JS client. - Browser binds to custom events and manipulates DOM - Treat server as any DOM element
- - Send form to sockets server - Familar Javascript events-centric semantics - Wrapper sends JSON event convention
- - Simplified. Trivial - wraps WebSocket object - callbacks chain - JSON encoding - decoding
- - callback chain - add one or more handlers to each event name
- - hook in WebSocket.onmessage() - JSON-decode - execute callbacks for each event name
- Trigger and send event to server - JSON-encode message to format convention - [event_name, data]