Add documentation for Cowboy 2.2

author: Loïc Hoguin <[email protected]> 2017-12-11 11:27:17 +0100
committer: Loïc Hoguin <[email protected]> 2017-12-11 11:27:17 +0100
commit: 1b863c350ba1f9b8ad1cb458df514ab0fe6bb127 (patch)
tree: f3f88acba06cce7095a047da8163ac0f92b1a64a /docs/en/cowboy/2.2/manual/cowboy_loop/index.html
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+
+<h1 class="lined-header"><span>cowboy_loop(3)</span></h1>
+
+<div class="sect1">
+<h2 id="_name">Name</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>cowboy_loop - Loop handlers</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">Description</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The module <code>cowboy_loop</code> defines a callback interface for
+long running HTTP connections.</p></div>
+<div class="paragraph"><p>You should switch to this behavior for long polling,
+server-sent events and similar long-running requests.</p></div>
+<div class="paragraph"><p>There are generally two usage patterns:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+Loop until receiving a specific message, then send
+  a response and stop execution (for example long polling);
+</p>
+</li>
+<li>
+<p>
+Or initiate a response in <code>init/2</code> and stream the
+  body in <code>info/3</code> as necessary (for example server-sent events).
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_callbacks">Callbacks</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Loop handlers implement the following interface:</p></div>
+<div class="listingblock">
+<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: #000000">init</span></span>(<span style="color: #009900">Req</span>, <span style="color: #009900">State</span>)
+    <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">cowboy_loop</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>}
+     | {<span style="color: #FF6600">cowboy_loop</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>, <span style="color: #FF6600">hibernate</span>}
+
+<span style="font-weight: bold"><span style="color: #000000">info</span></span>(<span style="color: #009900">Info</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>)
+    <span style="color: #990000">-&gt;</span> {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>}
+     | {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>, <span style="color: #FF6600">hibernate</span>}
+     | {<span style="color: #FF6600">stop</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>}
+
+<span style="font-weight: bold"><span style="color: #000000">terminate</span></span>(<span style="color: #009900">Reason</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">State</span>) <span style="color: #990000">-&gt;</span> <span style="color: #FF6600">ok</span>  <span style="font-style: italic"><span style="color: #9A1900">%% optional</span></span>
+
+<span style="color: #009900">Req</span>    <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>()
+<span style="color: #009900">State</span>  <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
+<span style="color: #009900">Info</span>   <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
+<span style="color: #009900">Reason</span> <span style="color: #990000">::</span> <span style="color: #FF6600">stop</span>
+        | {<span style="color: #FF6600">crash</span>, <span style="color: #FF6600">error</span> | <span style="font-weight: bold"><span style="color: #000080">exit</span></span> | <span style="font-weight: bold"><span style="color: #000080">throw</span></span>, <span style="font-weight: bold"><span style="color: #000000">any</span></span>()}</tt></pre></div></div>
+<div class="paragraph"><p>The <code>init/2</code> callback is common to all handlers. To switch
+to the loop behavior, it must return <code>cowboy_loop</code> as the
+first element of the tuple.</p></div>
+<div class="paragraph"><p>The <code>info/3</code> callback will be called for every Erlang message
+received. It may choose to continue the receive loop or stop
+it.</p></div>
+<div class="paragraph"><p>The optional <code>terminate/3</code> callback will ultimately be called
+with the reason for the termination of the handler.
+Cowboy will terminate the process right after this. There
+is no need to perform any cleanup in this callback.</p></div>
+<div class="paragraph"><p>The following terminate reasons are defined for loop handlers:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+stop
+</dt>
+<dd>
+<p>
+    The handler requested to close the connection by returning
+    a <code>stop</code> tuple.
+</p>
+</dd>
+<dt class="hdlist1">
+{crash, Class, Reason}
+</dt>
+<dd>
+<p>
+    A crash occurred in the handler. <code>Class</code> and <code>Reason</code> can be
+    used to obtain more information about the crash. The function
+    <code>erlang:get_stacktrace/0</code> can also be called to obtain the
+    stacktrace of the process when the crash occurred.
+</p>
+</dd>
+</dl></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_changelog">Changelog</h2>
+<div class="sectionbody">
+<div class="ulist"><ul>
+<li>
+<p>
+<strong>2.0</strong>: Loop handlers no longer need to handle overflow/timeouts.
+</p>
+</li>
+<li>
+<p>
+<strong>1.0</strong>: Behavior introduced.
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_see_also">See also</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><a href="..">cowboy(7)</a>,
+<a href="../cowboy_handler">cowboy_handler(3)</a></p></div>
+</div>
+</div>
+
+
+
+
+
+</div>
+
+<div class="span3 sidecol">
+
+
+<h3>
+	Cowboy
+	2.2
+	Function Reference
+	
+</h3>
+
+<ul>
+	
+		<li><a href="/docs/en/cowboy/2.2/guide">User Guide</a></li>
+	
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">Function Reference</a></li>
+	
+	
+</ul>
+
+<h4 id="docs-nav">Navigation</h4>
+
+<h4>Version select</h4>
+<ul>
+	
+	
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">2.2</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.1/manual">2.1</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.0/manual">2.0</a></li>
+	
+		<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
+	
+</ul>
+
+</div>
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author	Loïc Hoguin <[email protected]>	2017-12-11 11:27:17 +0100
committer	Loïc Hoguin <[email protected]>	2017-12-11 11:27:17 +0100
commit	1b863c350ba1f9b8ad1cb458df514ab0fe6bb127 (patch)
tree	f3f88acba06cce7095a047da8163ac0f92b1a64a /docs/en/cowboy/2.2/manual/cowboy_loop/index.html
parent	35825f89b61579d4270d6970609047945277acf7 (diff)
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