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<h1 class="lined-header"><span>gun_ws_protocol(3)</span></h1>
<h2 id="_name">Name</h2>
<p>gun_ws_protocol - Websocket subprotocols</p>
<h2 id="_description">Description</h2>
<p>The <code>gun_ws_protocol</code> module provides the callback interface and types for implementing Websocket subprotocols.</p>
<h2 id="_callbacks">Callbacks</h2>
<p>Websocket subprotocols implement the following interface.</p>
<h3 id="_init">init</h3>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">init</font></b>(<font color="#009900">ReplyTo</font>, <font color="#009900">StreamRef</font>, <font color="#009900">Headers</font>, <font color="#009900">Opts</font>) <font color="#990000">-></font> {<font color="#FF6600">ok</font>, <font color="#009900">State</font>}
<font color="#009900">ReplyTo</font> <font color="#990000">::</font> <b><font color="#000080">pid</font></b>()
<font color="#009900">StreamRef</font> <font color="#990000">::</font> <b><font color="#000080">reference</font></b>()
<font color="#009900">Headers</font> <font color="#990000">::</font> <b><font color="#000000">cow_http:headers</font></b>()
<font color="#009900">Opts</font> <font color="#990000">::</font> <b><font color="#000000">gun:ws_opts</font></b>()
<font color="#009900">State</font> <font color="#990000">::</font> <b><font color="#000000">protocol_state</font></b>()</tt></pre>
</div></div>
<p>Initialize the Websocket protocol.</p>
<dl><dt>ReplyTo</dt>
<dd><p>The pid of the process that owns the stream and to which messages will be sent to.</p>
</dd>
<dt>StreamRef</dt>
<dd><p>The reference for the stream. Must be sent in messages to distinguish between different streams.</p>
</dd>
<dt>Headers</dt>
<dd><p>Headers that were sent in the response establishing the Websocket connection.</p>
</dd>
<dt>Opts</dt>
<dd><p>Websocket options. Custom options can be provided in the <code>user_opts</code> key.</p>
</dd>
<dt>State</dt>
<dd><p>State for the protocol.</p>
</dd>
</dl>
<h3 id="_handle">handle</h3>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">handle</font></b>(<font color="#009900">Frame</font>, <font color="#009900">State</font>) <font color="#990000">-></font> {<font color="#FF6600">ok</font>, <font color="#009900">FlowDec</font>, <font color="#009900">State</font>}
<font color="#009900">Frame</font> <font color="#990000">::</font> <b><font color="#000000">cow_ws:frame</font></b>()
<font color="#009900">State</font> <font color="#990000">::</font> <b><font color="#000000">protocol_state</font></b>()
<font color="#009900">FlowDec</font> <font color="#990000">::</font> <b><font color="#000000">non_neg_integer</font></b>()</tt></pre>
</div></div>
<p>Handle a Websocket frame.</p>
<p>This callback may receive fragmented frames depending on the protocol and may need to rebuild the full frame to process it.</p>
<dl><dt>Frame</dt>
<dd><p>Websocket frame.</p>
</dd>
<dt>State</dt>
<dd><p>State for the protocol.</p>
</dd>
<dt>FlowDec</dt>
<dd><p>How many messages were sent. Used to update the flow control state when the feature is enabled.</p>
</dd>
</dl>
<h2 id="_types">Types</h2>
<h3 id="_protocol_state">protocol_state()</h3>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">protocol_state</font></b>() <font color="#990000">::</font> <b><font color="#000000">any</font></b>()</tt></pre>
</div></div>
<p>State for the protocol.</p>
<p>As this part of the implementation of the protocol the type may differ between different Websocket protocol modules.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Module introduced.
</li>
</ul>
<h2 id="_see_also">See also</h2>
<p><a href="..">gun(7)</a>, <a href="../gun">gun(3)</a>, <a href="../gun.ws_upgrade">gun:ws_upgrade(3)</a></p>
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