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<h1>Build custom protocols with Ranch and msgpack</h1>
<h2>Erlang Factory Lite Munich 2013, Nine Nines</h2>
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<h1>Build custom protocols with Ranch and msgpack</h1>
<h2>Building protocols is fun!</h2>
<h3>Loïc Hoguin - @lhoguin</h3>
<h4>Erlang Cowboy and Nine Nines Founder</h4>
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<h1>Essentials</h1>
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<h1>Ranch</h1>
<ul>
<li>Spin-off from Cowboy</li>
<li>Transport and protocol agnostic acceptor pool</li>
<li>Fully dynamic</li>
<li>Well documented</li>
<li>Production ready</li>
<li>Tested with > 1 million Websocket connections</li>
</ul>
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<h1>msgpack 1/2</h1>
<ul>
<li>"It's like JSON. but fast and small."</li>
<li>Binary serialization library</li>
<li>Deserialization is streamable</li>
<li>http://msgpack.org</li>
</ul>
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<h1>msgpack 2/2</h1>
<ul>
<li>Available for Ruby, Python, Perl, C/C++, Java, Scala, PHP, Lua, JavaScript, Node.js, Haskell, C#, Objective-C, Erlang, D, OCaml, Go, LabVIEW, Smalltalk</li>
</ul>
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<h1>Using msgpack with Ranch</h1>
<ul>
<li>PASTE LIVE DEMO HERE</li>
</ul>
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<h1>Guide to building a msgpack RPC service</h1>
<ul>
<li>You most likely won't need async, sync is easier to pull off</li>
<li>You most likely don't need connection pooling</li>
<li>Follow the HTTP request/response model</li>
<li>Send a request, expect a response, continue if successful</li>
<li>Don't forget to close the connection when done</li>
</ul>
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<h1>The future of Ranch</h1>
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<h1>Custom connections supervisor</h1>
<ul>
<li>Remove the need to monitor processes twice</li>
<li>Reduce the overhead to a minimal</li>
<li>No gen.erl, gen_server.erl</li>
<li>No options to take care of, no restart strategy</li>
<li>Bare minimum</li>
</ul>
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<h1>Minimal supervisor</h1>
<ul>
<li>Special process</li>
<li>Traps exits</li>
<li>Exit when parent exits</li>
<li>Handle '$gen_call' messages</li>
<li>Reply properly to which_children message</li>
</ul>
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<h1>Results</h1>
<ul>
<li>About 100LOCs for the supervisor</li>
<li>Greatly simplified architecture of the project</li>
<li>Much improved performance, especially with many connections</li>
<li>Still OTP</li>
</ul>
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<h1>Thanks!</h1>
<ul>
<li>http://ninenines.eu</li>
<li>https://github.com/extend/ranch</li>
<li>#ninenines on Freenode</li>
<li>@lhoguin on Twitter</li>
</ul>
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<h1>Questions?</h1>
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