diff options
Diffstat (limited to 'docs/en/cowboy/2.13/manual/cowboy_metrics_h/index.html')
| -rw-r--r-- | docs/en/cowboy/2.13/manual/cowboy_metrics_h/index.html | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/docs/en/cowboy/2.13/manual/cowboy_metrics_h/index.html b/docs/en/cowboy/2.13/manual/cowboy_metrics_h/index.html new file mode 100644 index 00000000..e546dd31 --- /dev/null +++ b/docs/en/cowboy/2.13/manual/cowboy_metrics_h/index.html @@ -0,0 +1,292 @@ +<!DOCTYPE html> +<html lang="en"> + +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <meta name="description" content=""> + <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara"> + + <title>Nine Nines: cowboy_metrics_h(3)</title> + + <link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic' rel='stylesheet' type='text/css'> + <link href="/css/99s.css?r=7" rel="stylesheet"> + + <link rel="shortcut icon" href="/img/ico/favicon.ico"> + <link rel="apple-touch-icon-precomposed" sizes="114x114" href="/img/ico/apple-touch-icon-114.png"> + <link rel="apple-touch-icon-precomposed" sizes="72x72" href="/img/ico/apple-touch-icon-72.png"> + <link rel="apple-touch-icon-precomposed" href="/img/ico/apple-touch-icon-57.png"> + + </head> + + +<body class=""> + <header id="page-head"> + <div id="topbar" class="container"> + <div class="row"> + <div class="span2"> + <h1 id="logo"><a href="/" title="99s">99s</a></h1> + </div> + <div class="span10"> + + <div id="side-header"> + <nav> + <ul> + <li><a title="Hear my thoughts" href="/articles">Articles</a></li> + <li><a title="Watch my talks" href="/talks">Talks</a></li> + <li class="active"><a title="Read the docs" href="/docs">Documentation</a></li> + <li><a title="Request my services" href="/services">Consulting & Training</a></li> + </ul> + </nav> + <ul id="social"> + <li> + <a href="https://github.com/ninenines" title="Check my Github repositories"><img src="/img/ico_github.png" data-hover="/img/ico_github_alt.png" alt="Github"></a> + </li> + <li> + <a title="Contact me" href="mailto:[email protected]"><img src="/img/ico_mail.png" data-hover="/img/ico_mail_alt.png"></a> + </li> + </ul> + </div> + </div> + </div> + </div> + + +</header> + +<div id="contents" class="two_col"> +<div class="container"> +<div class="row"> +<div id="docs" class="span9 maincol"> + +<h1 class="lined-header"><span>cowboy_metrics_h(3)</span></h1> + +<h2 id="_name">Name</h2> +<p>cowboy_metrics_h - Metrics stream handler</p> +<h2 id="_description">Description</h2> +<p>The module <code>cowboy_metrics_h</code> gathers metrics and other information about a stream. It then calls the configured callback with this data.</p> +<h2 id="_types">Types</h2> +<h3 id="_metrics">metrics()</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">metrics</font></b>() <font color="#990000">::</font> #{ + <i><font color="#9A1900">%% The identifier for this listener.</font></i> + <font color="#FF6600">ref</font> <font color="#990000">:=</font> <b><font color="#000000">ranch:ref</font></b>(), + + <i><font color="#9A1900">%% The pid for this connection.</font></i> + <font color="#FF6600">pid</font> <font color="#990000">:=</font> <b><font color="#000080">pid</font></b>(), + + <i><font color="#9A1900">%% The streamid also indicates the total number of requests on</font></i> + <i><font color="#9A1900">%% this connection (StreamID div 2 + 1).</font></i> + <font color="#FF6600">streamid</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy_stream:streamid</font></b>(), + + <i><font color="#9A1900">%% The terminate reason is always useful.</font></i> + <font color="#FF6600">reason</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy_stream:reason</font></b>(), + + <i><font color="#9A1900">%% A filtered Req object or a partial Req object</font></i> + <i><font color="#9A1900">%% depending on how far the request got to.</font></i> + <font color="#0000FF">req</font> <font color="#990000">=></font> <b><font color="#000000">cowboy_req:req</font></b>(), + <font color="#0000FF">partial_req</font> <font color="#990000">=></font> <b><font color="#000000">cowboy_stream:partial_req</font></b>(), + + <i><font color="#9A1900">%% Response status.</font></i> + <font color="#FF6600">resp_status</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy:http_status</font></b>(), + + <i><font color="#9A1900">%% Filtered response headers.</font></i> + <font color="#FF6600">resp_headers</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy:http_headers</font></b>(), + + <i><font color="#9A1900">%% Start/end of the processing of the request.</font></i> + <i><font color="#9A1900">%%</font></i> + <i><font color="#9A1900">%% This represents the time from this stream handler's init</font></i> + <i><font color="#9A1900">%% to terminate.</font></i> + <font color="#0000FF">req_start</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + <font color="#0000FF">req_end</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% Start/end of the receiving of the request body.</font></i> + <i><font color="#9A1900">%% Begins when the first packet has been received.</font></i> + <font color="#0000FF">req_body_start</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + <font color="#0000FF">req_body_end</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% Start/end of the sending of the response.</font></i> + <i><font color="#9A1900">%% Begins when we send the headers and ends on the final</font></i> + <i><font color="#9A1900">%% packet of the response body. If everything is sent at</font></i> + <i><font color="#9A1900">%% once these values are identical.</font></i> + <font color="#0000FF">resp_start</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + <font color="#0000FF">resp_end</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% For early errors all we get is the time we received it.</font></i> + <font color="#0000FF">early_error_time</font> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% Start/end of spawned processes. This is where most of</font></i> + <i><font color="#9A1900">%% the user code lies, excluding stream handlers. On a</font></i> + <i><font color="#9A1900">%% default Cowboy configuration there should be only one</font></i> + <i><font color="#9A1900">%% process: the request process.</font></i> + <font color="#0000FF">procs</font> <font color="#990000">=></font> <font color="#009900">ProcMetrics</font>, + + <i><font color="#9A1900">%% Informational responses sent before the final response.</font></i> + <font color="#0000FF">informational</font> <font color="#990000">=></font> [<font color="#009900">InformationalMetrics</font>], + + <i><font color="#9A1900">%% Length of the request and response bodies. This does</font></i> + <i><font color="#9A1900">%% not include the framing.</font></i> + <font color="#0000FF">req_body_length</font> <font color="#990000">=></font> <b><font color="#000000">non_neg_integer</font></b>(), + <font color="#0000FF">resp_body_length</font> <font color="#990000">=></font> <b><font color="#000000">non_neg_integer</font></b>(), + + <i><font color="#9A1900">%% Additional metadata set by the user.</font></i> + <font color="#0000FF">user_data</font> <font color="#990000">=></font> <b><font color="#000000">map</font></b>() +} + +<font color="#009900">InformationalMetrics</font> <font color="#990000">::</font> #{ + <i><font color="#9A1900">%% Informational response status.</font></i> + <font color="#FF6600">status</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy:http_status</font></b>(), + + <i><font color="#9A1900">%% Headers sent with the informational response.</font></i> + <font color="#FF6600">headers</font> <font color="#990000">:=</font> <b><font color="#000000">cowboy:http_headers</font></b>(), + + <i><font color="#9A1900">%% Time when the informational response was sent.</font></i> + <font color="#FF6600">time</font> <font color="#990000">:=</font> <b><font color="#000080">integer</font></b>() +} + +<font color="#009900">ProcMetrics</font> <font color="#990000">::</font> #{<b><font color="#000080">pid</font></b>() <font color="#990000">=></font> #{ + <i><font color="#9A1900">%% Time at which the process spawned.</font></i> + <font color="#FF6600">spawn</font> <font color="#990000">:=</font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% Time at which the process exited.</font></i> + <b><font color="#000080">exit</font></b> <font color="#990000">=></font> <b><font color="#000080">integer</font></b>(), + + <i><font color="#9A1900">%% Reason for the process exit.</font></i> + <font color="#0000FF">reason</font> <font color="#990000">=></font> <b><font color="#000000">any</font></b>() +}}</tt></pre> +</div></div> +<p>Metrics given to the callback function.</p> +<p>Depending on the life of the stream the metrics may include more or less information.</p> +<p>The <code>set_options</code> command can be used to add additional metadata in the <code>user_data</code> metric. This can be used for example to add the handler module which was selected by the router. The option to be set is <code>metrics_user_data</code>. It takes a map which will be merged in the existing <code>user_data</code> map.</p> +<h2 id="_options">Options</h2> +<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">opts</font></b>() <font color="#990000">::</font> #{ + <font color="#0000FF">metrics_callback</font> <font color="#990000">=></font> <b><font color="#0000FF">fun</font></b>((<b><font color="#000000">metrics</font></b>()) <font color="#990000">-></font> <b><font color="#000000">any</font></b>()), + <font color="#0000FF">metrics_req_filter</font> <font color="#990000">=></font> <b><font color="#0000FF">fun</font></b>((<b><font color="#000000">cowboy_req:req</font></b>()) <font color="#990000">-></font> <b><font color="#000000">map</font></b>()), + <font color="#0000FF">metrics_resp_headers_filter</font> <font color="#990000">=></font> <b><font color="#0000FF">fun</font></b>((<b><font color="#000000">cowboy:http_headers</font></b>()) <font color="#990000">-></font> <b><font color="#000000">cowboy:http_headers</font></b>()) +}</tt></pre> +</div></div> +<p>Configuration for the metrics stream handler.</p> +<dl><dt>metrics_callback - mandatory</dt> +<dd><p>The function that will be called upon completion of the stream. It only takes a single argument, the <code>metrics()</code>.</p> +</dd> +<dt>metrics_req_filter</dt> +<dd><p>A function applied to the Req to compact it and only keep required information. By default no filtering is done.</p> +</dd> +<dt>metrics_resp_headers_filter</dt> +<dd><p>A function applied to the response headers to filter them and only keep required information. By default no filtering is done.</p> +</dd> +</dl> +<h2 id="_events">Events</h2> +<p>The metrics stream handler does not produce any event.</p> +<h2 id="_changelog">Changelog</h2> +<ul><li><strong>2.7</strong>: Module introduced. +</li> +</ul> +<h2 id="_see_also">See also</h2> +<p><a href="..">cowboy(7)</a>, <a href="../cowboy_stream">cowboy_stream(3)</a>, <a href="../cowboy_compress_h">cowboy_compress_h(3)</a>, <a href="../cowboy_decompress_h">cowboy_decompress_h(3)</a>, <a href="../cowboy_stream_h">cowboy_stream_h(3)</a>, <a href="../cowboy_tracer_h">cowboy_tracer_h(3)</a></p> + + + + + + +</div> + +<div class="span3 sidecol"> + + +<h3> + Cowboy + 2.13 + Function Reference + +</h3> + +<ul> + + <li><a href="/docs/en/cowboy/2.13/guide">User Guide</a></li> + + + <li><a href="/docs/en/cowboy/2.13/manual">Function Reference</a></li> + + +</ul> + +<h4 id="docs-nav">Navigation</h4> + +<h4>Version select</h4> +<ul> + + + + <li><a href="/docs/en/cowboy/2.13/manual">2.13</a></li> + + <li><a href="/docs/en/cowboy/2.12/manual">2.12</a></li> + + <li><a href="/docs/en/cowboy/2.11/manual">2.11</a></li> + + <li><a href="/docs/en/cowboy/2.10/manual">2.10</a></li> + + <li><a href="/docs/en/cowboy/2.9/manual">2.9</a></li> + + <li><a href="/docs/en/cowboy/2.8/manual">2.8</a></li> + + <li><a href="/docs/en/cowboy/2.7/manual">2.7</a></li> + + <li><a href="/docs/en/cowboy/2.6/manual">2.6</a></li> + +</ul> + +<h3 id="_like_my_work__donate">Like my work? Donate!</h3> +<p>Donate to Loïc Hoguin because his work on Cowboy, Ranch, Gun and Erlang.mk is fantastic:</p> +<form action="https://www.paypal.com/cgi-bin/webscr" method="post" style="display:inline"> +<input type="hidden" name="cmd" value="_donations"> +<input type="hidden" name="business" value="[email protected]"> +<input type="hidden" name="lc" value="FR"> +<input type="hidden" name="item_name" value="Loic Hoguin"> +<input type="hidden" name="item_number" value="99s"> +<input type="hidden" name="currency_code" value="EUR"> +<input type="hidden" name="bn" value="PP-DonationsBF:btn_donate_LG.gif:NonHosted"> +<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"> +<img alt="" border="0" src="https://www.paypalobjects.com/fr_FR/i/scr/pixel.gif" width="1" height="1"> +</form><p>Recurring payment options are also available via <a href="https://github.com/sponsors/essen">GitHub Sponsors</a>. These funds are used to cover the recurring expenses like food, dedicated servers or domain names.</p> + + + +</div> +</div> +</div> +</div> + + <footer> + <div class="container"> + <div class="row"> + <div class="span6"> + <p id="scroll-top"><a href="#">↑ Scroll to top</a></p> + <nav> + <ul> + <li><a href="mailto:[email protected]" title="Contact us">Contact us</a></li><li><a href="https://github.com/ninenines/ninenines.github.io" title="Github repository">Contribute to this site</a></li> + </ul> + </nav> + </div> + <div class="span6 credits"> + <p><img src="/img/footer_logo.png"></p> + <p>Copyright © Loïc Hoguin 2012-2018</p> + </div> + </div> + </div> + </footer> + + + <script src="/js/custom.js"></script> + </body> +</html> + + |