Fix some links and add Ranch 1.4 docs

They were mistakenly labeled as 1.3. Sorry!
author: Loïc Hoguin <[email protected]> 2017-10-03 15:50:36 +0200
committer: Loïc Hoguin <[email protected]> 2017-10-03 15:50:36 +0200
commit: 5cb08c35580023b91091c93f9a1f9198e35055c2 (patch)
tree: fcac3159b52e14db41d5f1d1b19f5d8530cc0d74 /docs/en/ranch/1.4/guide/protocols/index.html
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+<!DOCTYPE html>
+<html lang="en">
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+<head>
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+    <title>Nine Nines: Protocols</title>
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+<div id="docs" class="span9 maincol">
+
+<h1 class="lined-header"><span>Protocols</span></h1>
+
+<div class="paragraph"><p>A protocol handler starts a connection process and defines the
+protocol logic executed in this process.</p></div>
+<div class="sect1">
+<h2 id="_writing_a_protocol_handler">Writing a protocol handler</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>All protocol handlers must implement the <code>ranch_protocol</code> behavior
+which defines a single callback, <code>start_link/4</code>. This callback is
+responsible for spawning a new process for handling the connection.
+It receives four arguments: the name of the listener, the socket, the
+transport handler being used and the protocol options defined in
+the call to <code>ranch:start_listener/5</code>. This callback must
+return <code>{ok, Pid}</code>, with <code>Pid</code> the pid of the new process.</p></div>
+<div class="paragraph"><p>The newly started process can then freely initialize itself. However,
+it must call <code>ranch:accept_ack/1</code> before doing any socket operation.
+This will ensure the connection process is the owner of the socket.
+It expects the listener&#8217;s name as argument.</p></div>
+<div class="listingblock">
+<div class="title">Acknowledge accepting the socket</div>
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="color: #0000FF">ok</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">ranch:accept_ack</span></span>(<span style="color: #009900">Ref</span>)<span style="color: #990000">.</span></tt></pre></div></div>
+<div class="paragraph"><p>If your protocol code requires specific socket options, you should
+set them while initializing your connection process, after
+calling <code>ranch:accept_ack/1</code>. You can use <code>Transport:setopts/2</code>
+for that purpose.</p></div>
+<div class="paragraph"><p>Following is the complete protocol code for the example found
+in <code>examples/tcp_echo/</code>.</p></div>
+<div class="listingblock">
+<div class="title">Protocol module that echoes everything it receives</div>
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">-module</span></span>(<span style="color: #FF6600">echo_protocol</span>)<span style="color: #990000">.</span>
+<span style="font-weight: bold"><span style="color: #000080">-behaviour</span></span>(<span style="color: #FF6600">ranch_protocol</span>)<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000080">-export</span></span>([<span style="font-weight: bold"><span style="color: #000000">start_link</span></span><span style="color: #990000">/</span><span style="color: #993399">4</span>])<span style="color: #990000">.</span>
+<span style="font-weight: bold"><span style="color: #000080">-export</span></span>([<span style="font-weight: bold"><span style="color: #000000">init</span></span><span style="color: #990000">/</span><span style="color: #993399">4</span>])<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000000">start_link</span></span>(<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">Opts</span>) <span style="color: #990000">-&gt;</span>
+        <span style="color: #009900">Pid</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000080">spawn_link</span></span>(<span style="font-weight: bold"><span style="color: #000080">?MODULE</span></span>, <span style="color: #FF6600">init</span>, [<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">Opts</span>]),
+        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Pid</span>}<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000000">init</span></span>(<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">_Opts</span> <span style="color: #990000">=</span> []) <span style="color: #990000">-&gt;</span>
+        <span style="color: #0000FF">ok</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">ranch:accept_ack</span></span>(<span style="color: #009900">Ref</span>),
+        <span style="font-weight: bold"><span style="color: #000000">loop</span></span>(<span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>)<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000000">loop</span></span>(<span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>) <span style="color: #990000">-&gt;</span>
+        <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="color: #009900">Transport</span><span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #000000">recv</span></span>(<span style="color: #009900">Socket</span>, <span style="color: #993399">0</span>, <span style="color: #993399">5000</span>) <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+                {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Data</span>} <span style="color: #990000">-&gt;</span>
+                        <span style="color: #009900">Transport</span><span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #000000">send</span></span>(<span style="color: #009900">Socket</span>, <span style="color: #009900">Data</span>),
+                        <span style="font-weight: bold"><span style="color: #000000">loop</span></span>(<span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>);
+                <span style="color: #990000">_</span> <span style="color: #990000">-&gt;</span>
+                        <span style="color: #0000FF">ok</span> <span style="color: #990000">=</span> <span style="color: #009900">Transport</span><span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #000000">close</span></span>(<span style="color: #009900">Socket</span>)
+        <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_using_gen_server">Using gen_server</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Special processes like the ones that use the <code>gen_server</code> or <code>gen_fsm</code>
+behaviours have the particularity of having their <code>start_link</code> call not
+return until the <code>init</code> function returns. This is problematic, because
+you won&#8217;t be able to call <code>ranch:accept_ack/1</code> from the <code>init</code> callback
+as this would cause a deadlock to happen.</p></div>
+<div class="paragraph"><p>Use the <code>gen_server:enter_loop/3</code> function. It allows you to start your process
+normally (although it must be started with <code>proc_lib</code> like all special
+processes), then perform any needed operations before falling back into
+the normal <code>gen_server</code> execution loop.</p></div>
+<div class="listingblock">
+<div class="title">Use a gen_server for protocol handling</div>
+<div class="content"><!-- Generator: GNU source-highlight 3.1.8
+by Lorenzo Bettini
+http://www.lorenzobettini.it
+http://www.gnu.org/software/src-highlite -->
+<pre><tt><span style="font-weight: bold"><span style="color: #000080">-module</span></span>(<span style="color: #FF6600">my_protocol</span>)<span style="color: #990000">.</span>
+<span style="font-weight: bold"><span style="color: #000080">-behaviour</span></span>(<span style="color: #FF6600">gen_server</span>)<span style="color: #990000">.</span>
+<span style="font-weight: bold"><span style="color: #000080">-behaviour</span></span>(<span style="color: #FF6600">ranch_protocol</span>)<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000080">-export</span></span>([<span style="font-weight: bold"><span style="color: #000000">start_link</span></span><span style="color: #990000">/</span><span style="color: #993399">4</span>])<span style="color: #990000">.</span>
+<span style="font-weight: bold"><span style="color: #000080">-export</span></span>([<span style="font-weight: bold"><span style="color: #000000">init</span></span><span style="color: #990000">/</span><span style="color: #993399">1</span>])<span style="color: #990000">.</span>
+<span style="font-style: italic"><span style="color: #9A1900">%% Exports of other gen_server callbacks here.</span></span>
+
+<span style="font-weight: bold"><span style="color: #000000">start_link</span></span>(<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">Opts</span>) <span style="color: #990000">-&gt;</span>
+        {<span style="color: #FF6600">ok</span>, <span style="font-weight: bold"><span style="color: #000000">proc_lib:spawn_link</span></span>(<span style="font-weight: bold"><span style="color: #000080">?MODULE</span></span>, <span style="color: #FF6600">init</span>, [{<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">Opts</span>}])}<span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000000">init</span></span>({<span style="color: #009900">Ref</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>, <span style="color: #009900">_Opts</span> <span style="color: #990000">=</span> []}) <span style="color: #990000">-&gt;</span>
+        <span style="font-style: italic"><span style="color: #9A1900">%% Perform any required state initialization here.</span></span>
+        <span style="color: #0000FF">ok</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">ranch:accept_ack</span></span>(<span style="color: #009900">Ref</span>),
+        <span style="color: #0000FF">ok</span> <span style="color: #990000">=</span> <span style="color: #009900">Transport</span><span style="color: #990000">:</span><span style="font-weight: bold"><span style="color: #000000">setopts</span></span>(<span style="color: #009900">Socket</span>, [{<span style="color: #FF6600">active</span>, <span style="color: #FF6600">once</span>}]),
+        <span style="font-weight: bold"><span style="color: #000000">gen_server:enter_loop</span></span>(<span style="font-weight: bold"><span style="color: #000080">?MODULE</span></span>, [], {<span style="color: #FF6600">state</span>, <span style="color: #009900">Socket</span>, <span style="color: #009900">Transport</span>})<span style="color: #990000">.</span>
+
+<span style="font-style: italic"><span style="color: #9A1900">%% Other gen_server callbacks here.</span></span></tt></pre></div></div>
+<div class="paragraph"><p>Check the <code>tcp_reverse</code> example for a complete example.</p></div>
+</div>
+</div>
+
+
+
+	
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+	Ranch
+	1.4
+	
+	User Guide
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+
+<ul>
+	
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+	
+		<li><a href="/docs/en/ranch/1.3/guide">1.3</a></li>
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author	Loïc Hoguin <[email protected]>	2017-10-03 15:50:36 +0200
committer	Loïc Hoguin <[email protected]>	2017-10-03 15:50:36 +0200
commit	5cb08c35580023b91091c93f9a1f9198e35055c2 (patch)
tree	fcac3159b52e14db41d5f1d1b19f5d8530cc0d74 /docs/en/ranch/1.4/guide/protocols/index.html
parent	35bc482f0be143abd728a228e937984dc5f6cc73 (diff)
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