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Diffstat (limited to 'docs/en/gun/1.0/guide/websocket/index.html')
-rw-r--r-- | docs/en/gun/1.0/guide/websocket/index.html | 249 |
1 files changed, 126 insertions, 123 deletions
diff --git a/docs/en/gun/1.0/guide/websocket/index.html b/docs/en/gun/1.0/guide/websocket/index.html index 4f162488..b10064cf 100644 --- a/docs/en/gun/1.0/guide/websocket/index.html +++ b/docs/en/gun/1.0/guide/websocket/index.html @@ -7,7 +7,7 @@ <meta name="description" content=""> <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara"> - <meta name="generator" content="Hugo 0.17" /> + <meta name="generator" content="Hugo 0.26" /> <title>Nine Nines: Websocket</title> @@ -67,134 +67,137 @@ <h1 class="lined-header"><span>Websocket</span></h1> -<div class="paragraph"><p>This chapter describes how to use the Gun client for
-communicating with a Websocket server.</p></div>
-<div class="paragraph"><p>@todo recovering from connection failure
-reconnecting to Websocket etc.</p></div>
-<div class="sect1">
-<h2 id="_http_upgrade">HTTP upgrade</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Websocket is a protocol built on top of HTTP. To use Websocket,
-you must first request for the connection to be upgraded. Only
-HTTP/1.1 connections can be upgraded to Websocket, so you might
-need to restrict the protocol to HTTP/1.1 if you are planning
-to use Websocket over TLS.</p></div>
-<div class="paragraph"><p>You must use the <code>gun_ws:upgrade/{2,3,4}</code> function to upgrade
-to Websocket. This function can be called anytime after connection,
-so you can send HTTP requests before upgrading to Websocket.</p></div>
-<div class="listingblock">
-<div class="title">Upgrade to Websocket</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: #000000">gun:ws_upgrade</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #FF0000">"/websocket"</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Gun will set all the necessary headers for performing the
-Websocket upgrade, but you can specify additional headers
-if needed. For example you can request a custom sub-protocol.</p></div>
-<div class="listingblock">
-<div class="title">Upgrade to Websocket and request a protocol</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: #000000">gun:ws_upgrade</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #FF0000">"/websocket"</span>, [
- {<span style="color: #990000"><<</span><span style="color: #FF0000">"sec-websocket-protocol"</span><span style="color: #990000">>></span>, <span style="color: #FF0000">"mychat"</span>}
-])<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>You can pass the Websocket options as part of the <code>gun:open/{2,3}</code>
-call when opening the connection, or using the <code>gun:ws_upgrade/4</code>.
-The fourth argument is those same options. This function call
-will crash if the options are incorrect, unlike when passing
-them through <code>gun:open/{2,3}</code>.</p></div>
-<div class="paragraph"><p>When the upgrade succeeds, a <code>gun_ws_upgrade</code> message is sent.
-If the server does not understand Websocket or refused the
-upgrade, a <code>gun_response</code> message is sent. If Gun couldn’t
-perform the upgrade due to an error (for example attempting
-to upgrade to Websocket on an HTTP/1.0 connection) then a
-<code>gun_error</code> message is sent.</p></div>
-<div class="paragraph"><p>When the server does not understand Websocket, it may send
-a meaningful response which should be processed. In the
-following example we however ignore it:</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: #0000FF">receive</span></span>
- {<span style="color: #FF6600">gun_ws_upgrade</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #FF6600">ok</span>, <span style="color: #009900">Headers</span>} <span style="color: #990000">-></span>
- <span style="font-weight: bold"><span style="color: #000000">upgrade_success</span></span>(<span style="color: #009900">ConnPid</span>);
- {<span style="color: #FF6600">gun_response</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #009900">Status</span>, <span style="color: #009900">Headers</span>} <span style="color: #990000">-></span>
- <span style="font-weight: bold"><span style="color: #000080">exit</span></span>({<span style="color: #FF6600">ws_upgrade_failed</span>, <span style="color: #009900">Status</span>, <span style="color: #009900">Headers</span>});
- {<span style="color: #FF6600">gun_error</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #009900">StreamRef</span>, <span style="color: #009900">Reason</span>} <span style="color: #990000">-></span>
- <span style="font-weight: bold"><span style="color: #000080">exit</span></span>({<span style="color: #FF6600">ws_upgrade_failed</span>, <span style="color: #009900">Reason</span>})
- <span style="font-style: italic"><span style="color: #9A1900">%% More clauses here as needed.</span></span>
-<span style="font-weight: bold"><span style="color: #0000FF">after</span></span> <span style="color: #993399">1000</span> <span style="color: #990000">-></span>
- <span style="font-weight: bold"><span style="color: #000080">exit</span></span>(<span style="color: #FF6600">timeout</span>)
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Note that you shouldn’t use the <code>reply_to</code> request option
-for connections you plan to upgrade, because only the
-owner of the connection will receive messages about it.</p></div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_sending_data">Sending data</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Once the Websocket upgrade has completed successfully, you no
-longer have access to functions for performing requests. You
-can only send and receive Websocket messages.</p></div>
-<div class="paragraph"><p>Use <code>gun:ws_send/2</code> to send one or more messages to the server.</p></div>
-<div class="paragraph"><p>@todo Implement sending of N frames</p></div>
-<div class="listingblock">
-<div class="title">Send a text frame</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: #000000">gun:ws_send</span></span>(<span style="color: #009900">ConnPid</span>, {<span style="color: #FF6600">text</span>, <span style="color: #FF0000">"Hello!"</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="listingblock">
-<div class="title">Send a text frame, a binary frame and then close the connection</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: #000000">gun:ws_send</span></span>(<span style="color: #009900">ConnPid</span>, [
- {<span style="color: #FF6600">text</span>, <span style="color: #FF0000">"Hello!"</span>},
- {<span style="font-weight: bold"><span style="color: #000080">binary</span></span>, <span style="color: #009900">BinaryValue</span>},
- <span style="color: #FF6600">close</span>
-])<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Note that if you send a close frame, Gun will close the connection
-cleanly and will not attempt to reconnect afterwards, similar to
-calling <code>gun:shutdown/1</code>.</p></div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_receiving_data">Receiving data</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Gun sends an Erlang message to the owner process for every
-Websocket message it receives.</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: #0000FF">receive</span></span>
- {<span style="color: #FF6600">gun_ws</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #009900">Frame</span>} <span style="color: #990000">-></span>
- <span style="font-weight: bold"><span style="color: #000000">handle_frame</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #009900">Frame</span>)
-<span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>@todo auto ping has not been implemented yet</p></div>
-<div class="paragraph"><p>Gun will automatically send ping messages to the server to keep
-the connection alive, however if the connection dies and Gun has
-to reconnect it will not upgrade to Websocket automatically, you
-need to perform the operation when you receive the <code>gun_error</code>
-message.</p></div>
-</div>
-</div>
+<div class="paragraph"><p>This chapter describes how to use the Gun client for +communicating with a Websocket server.</p></div> +<div class="paragraph"><p>@todo recovering from connection failure +reconnecting to Websocket etc.</p></div> +<div class="sect1"> +<h2 id="_http_upgrade">HTTP upgrade</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Websocket is a protocol built on top of HTTP. To use Websocket, +you must first request for the connection to be upgraded. Only +HTTP/1.1 connections can be upgraded to Websocket, so you might +need to restrict the protocol to HTTP/1.1 if you are planning +to use Websocket over TLS.</p></div> +<div class="paragraph"><p>You must use the <code>gun_ws:upgrade/{2,3,4}</code> function to upgrade +to Websocket. This function can be called anytime after connection, +so you can send HTTP requests before upgrading to Websocket.</p></div> +<div class="listingblock"> +<div class="title">Upgrade to Websocket</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: #000000">gun:ws_upgrade</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #FF0000">"/websocket"</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Gun will set all the necessary headers for performing the +Websocket upgrade, but you can specify additional headers +if needed. For example you can request a custom sub-protocol.</p></div> +<div class="listingblock"> +<div class="title">Upgrade to Websocket and request a protocol</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: #000000">gun:ws_upgrade</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #FF0000">"/websocket"</span>, [ + {<span style="color: #990000"><<</span><span style="color: #FF0000">"sec-websocket-protocol"</span><span style="color: #990000">>></span>, <span style="color: #FF0000">"mychat"</span>} +])<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>You can pass the Websocket options as part of the <code>gun:open/{2,3}</code> +call when opening the connection, or using the <code>gun:ws_upgrade/4</code>. +The fourth argument is those same options. This function call +will crash if the options are incorrect, unlike when passing +them through <code>gun:open/{2,3}</code>.</p></div> +<div class="paragraph"><p>When the upgrade succeeds, a <code>gun_ws_upgrade</code> message is sent. +If the server does not understand Websocket or refused the +upgrade, a <code>gun_response</code> message is sent. If Gun couldn’t +perform the upgrade due to an error (for example attempting +to upgrade to Websocket on an HTTP/1.0 connection) then a +<code>gun_error</code> message is sent.</p></div> +<div class="paragraph"><p>When the server does not understand Websocket, it may send +a meaningful response which should be processed. In the +following example we however ignore it:</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: #0000FF">receive</span></span> + {<span style="color: #FF6600">gun_ws_upgrade</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #FF6600">ok</span>, <span style="color: #009900">Headers</span>} <span style="color: #990000">-></span> + <span style="font-weight: bold"><span style="color: #000000">upgrade_success</span></span>(<span style="color: #009900">ConnPid</span>); + {<span style="color: #FF6600">gun_response</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #990000">_</span>, <span style="color: #990000">_</span>, <span style="color: #009900">Status</span>, <span style="color: #009900">Headers</span>} <span style="color: #990000">-></span> + <span style="font-weight: bold"><span style="color: #000080">exit</span></span>({<span style="color: #FF6600">ws_upgrade_failed</span>, <span style="color: #009900">Status</span>, <span style="color: #009900">Headers</span>}); + {<span style="color: #FF6600">gun_error</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #009900">StreamRef</span>, <span style="color: #009900">Reason</span>} <span style="color: #990000">-></span> + <span style="font-weight: bold"><span style="color: #000080">exit</span></span>({<span style="color: #FF6600">ws_upgrade_failed</span>, <span style="color: #009900">Reason</span>}) + <span style="font-style: italic"><span style="color: #9A1900">%% More clauses here as needed.</span></span> +<span style="font-weight: bold"><span style="color: #0000FF">after</span></span> <span style="color: #993399">1000</span> <span style="color: #990000">-></span> + <span style="font-weight: bold"><span style="color: #000080">exit</span></span>(<span style="color: #FF6600">timeout</span>) +<span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Note that you shouldn’t use the <code>reply_to</code> request option +for connections you plan to upgrade, because only the +owner of the connection will receive messages about it.</p></div> +</div> +</div> +<div class="sect1"> +<h2 id="_sending_data">Sending data</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Once the Websocket upgrade has completed successfully, you no +longer have access to functions for performing requests. You +can only send and receive Websocket messages.</p></div> +<div class="paragraph"><p>Use <code>gun:ws_send/2</code> to send one or more messages to the server.</p></div> +<div class="paragraph"><p>@todo Implement sending of N frames</p></div> +<div class="listingblock"> +<div class="title">Send a text frame</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: #000000">gun:ws_send</span></span>(<span style="color: #009900">ConnPid</span>, {<span style="color: #FF6600">text</span>, <span style="color: #FF0000">"Hello!"</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="listingblock"> +<div class="title">Send a text frame, a binary frame and then close the connection</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: #000000">gun:ws_send</span></span>(<span style="color: #009900">ConnPid</span>, [ + {<span style="color: #FF6600">text</span>, <span style="color: #FF0000">"Hello!"</span>}, + {<span style="font-weight: bold"><span style="color: #000080">binary</span></span>, <span style="color: #009900">BinaryValue</span>}, + <span style="color: #FF6600">close</span> +])<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Note that if you send a close frame, Gun will close the connection +cleanly and will not attempt to reconnect afterwards, similar to +calling <code>gun:shutdown/1</code>.</p></div> +</div> +</div> +<div class="sect1"> +<h2 id="_receiving_data">Receiving data</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Gun sends an Erlang message to the owner process for every +Websocket message it receives.</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: #0000FF">receive</span></span> + {<span style="color: #FF6600">gun_ws</span>, <span style="color: #009900">ConnPid</span>, <span style="color: #009900">Frame</span>} <span style="color: #990000">-></span> + <span style="font-weight: bold"><span style="color: #000000">handle_frame</span></span>(<span style="color: #009900">ConnPid</span>, <span style="color: #009900">Frame</span>) +<span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>@todo auto ping has not been implemented yet</p></div> +<div class="paragraph"><p>Gun will automatically send ping messages to the server to keep +the connection alive, however if the connection dies and Gun has +to reconnect it will not upgrade to Websocket automatically, you +need to perform the operation when you receive the <code>gun_error</code> +message.</p></div> +</div> +</div> + + + <nav style="margin:1em 0"> |