337 lines
12 KiB
HTML
337 lines
12 KiB
HTML
<!DOCTYPE html>
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<title>POABackend.Receivers.System.Stats – poa_backend v0.1.0</title>
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<a href="POABackend.html" class="sidebar-projectLink">
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<div class="sidebar-projectDetails">
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<h1 class="sidebar-projectName">
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poa_backend
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</h1>
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<h2 class="sidebar-projectVersion">
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v0.1.0
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</h2>
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<section class="content">
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<div id="content" class="content-inner">
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<h1>
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<small class="visible-xs">poa_backend v0.1.0</small>
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POABackend.Receivers.System.Stats
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L1" title="View Source" class="view-source" rel="help">
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<span class="sr-only">View Source</span>
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</a>
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</h1>
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<section id="moduledoc">
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<p>This is a Receiver Plugin which is in charge of storing the System Metrics received from the Agents in a Postgres
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database. If we want to use it we have to declare it in the Config file, inside the <code class="inline">:receivers</code> section, ie:</p>
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<pre><code class="elixir">{:store_system_stats, POABackend.Receivers.System.Stats, []}</code></pre>
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<p>This Plugin uses Postgres as a backend, specifically the <code class="inline">system_stats</code> table. Make sure that table exists before using
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this Plugin.</p>
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<p>We also need to subscribe this plugin to <code class="inline">:system_metrics</code> metrics in the config file. For that we have to add this line
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to the list in the <code class="inline">:subscriptions</code> section:</p>
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<pre><code class="elixir">{:store_system_stats, [:system_metrics]}</code></pre>
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</section>
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<section id="summary" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#summary">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this section</span>
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</a>
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Summary
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</h1>
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<div class="summary-functions summary">
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<h2>
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<a href="#functions">Functions</a>
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</h2>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#handle_inactive/2">handle_inactive(agent_id, state)</a>
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</div>
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<div class="summary-synopsis"><p>This function is called when a Custom Handler detects a client is inactive</p>
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</div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#handle_message/2">handle_message(message, state)</a>
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</div>
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<div class="summary-synopsis"><p>In this callback is called when the Receiver process receives an erlang message</p>
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</div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#init_receiver/1">init_receiver(args)</a>
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</div>
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<div class="summary-synopsis"><p>A callback executed when the Receiver Plugin starts.
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The argument is retrieved from the configuration file when the Receiver is defined
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It must return <code class="inline">{:ok, state}</code>, that <code class="inline">state</code> will be keept as in <a href="https://hexdocs.pm/elixir/GenServer.html"><code class="inline">GenServer</code></a> and can be
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retrieved in the <a href="#metrics_received/3"><code class="inline">metrics_received/3</code></a> function</p>
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</div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#metrics_received/3">metrics_received(arg1, from, state)</a>
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</div>
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<div class="summary-synopsis"><p>This callback will be called every time a message to the subscribed metric type arrives. It must
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return the tuple <code class="inline">{:ok, state}</code></p>
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</div>
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</div>
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<div class="summary-row">
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<div class="summary-signature">
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<a href="#terminate/1">terminate(state)</a>
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</div>
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<div class="summary-synopsis"><p>This callback is called just before the Process goes down. This is a good place for closing connections</p>
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</div>
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</div>
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</div>
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</section>
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<section id="functions" class="details-list">
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<h1 class="section-heading">
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<a class="hover-link" href="#functions">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this section</span>
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</a>
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Functions
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</h1>
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<div class="detail" id="handle_inactive/2">
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<div class="detail-header">
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<a href="#handle_inactive/2" class="detail-link" title="Link to this function">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this function</span>
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</a>
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<span class="signature">handle_inactive(agent_id, state)</span>
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L39" class="view-source" rel="help" title="View Source">
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<span class="icon-code" aria-hidden="true"></span>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<p> This function is called when a Custom Handler detects a client is inactive.</p>
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<p> The Custom Handler must to call explicity to <a href="POABackend.CustomHandler.html#publish_inactive/1"><code class="inline">POABackend.CustomHandler.publish_inactive/1</code></a> and it will publish the
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<code class="inline">inactive</code> message to all the metrics in the system (defined in the config file).</p>
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<p>Callback implementation for <a href="POABackend.Receiver.html#c:handle_inactive/2"><code class="inline">POABackend.Receiver.handle_inactive/2</code></a>.</p>
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</section>
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</div>
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<div class="detail" id="handle_message/2">
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<div class="detail-header">
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<a href="#handle_message/2" class="detail-link" title="Link to this function">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this function</span>
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</a>
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<span class="signature">handle_message(message, state)</span>
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L35" class="view-source" rel="help" title="View Source">
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<span class="icon-code" aria-hidden="true"></span>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<p> In this callback is called when the Receiver process receives an erlang message.</p>
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<p> It must return <code class="inline">{:ok, state}</code>.</p>
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<p>Callback implementation for <a href="POABackend.Receiver.html#c:handle_message/2"><code class="inline">POABackend.Receiver.handle_message/2</code></a>.</p>
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</section>
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</div>
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<div class="detail" id="init_receiver/1">
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<div class="detail-header">
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<a href="#init_receiver/1" class="detail-link" title="Link to this function">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this function</span>
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</a>
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<span class="signature">init_receiver(args)</span>
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L23" class="view-source" rel="help" title="View Source">
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<span class="icon-code" aria-hidden="true"></span>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<p> A callback executed when the Receiver Plugin starts.
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The argument is retrieved from the configuration file when the Receiver is defined
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It must return <code class="inline">{:ok, state}</code>, that <code class="inline">state</code> will be keept as in <a href="https://hexdocs.pm/elixir/GenServer.html"><code class="inline">GenServer</code></a> and can be
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retrieved in the <a href="#metrics_received/3"><code class="inline">metrics_received/3</code></a> function.</p>
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<p>Callback implementation for <a href="POABackend.Receiver.html#c:init_receiver/1"><code class="inline">POABackend.Receiver.init_receiver/1</code></a>.</p>
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</section>
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</div>
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<div class="detail" id="metrics_received/3">
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<div class="detail-header">
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<a href="#metrics_received/3" class="detail-link" title="Link to this function">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this function</span>
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</a>
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<span class="signature">metrics_received(arg1, from, state)</span>
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L31" class="view-source" rel="help" title="View Source">
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<span class="icon-code" aria-hidden="true"></span>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<p> This callback will be called every time a message to the subscribed metric type arrives. It must
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return the tuple <code class="inline">{:ok, state}</code></p>
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<p>Callback implementation for <a href="POABackend.Receiver.html#c:metrics_received/3"><code class="inline">POABackend.Receiver.metrics_received/3</code></a>.</p>
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</section>
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</div>
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<div class="detail" id="terminate/1">
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<div class="detail-header">
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<a href="#terminate/1" class="detail-link" title="Link to this function">
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<span class="icon-link" aria-hidden="true"></span>
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<span class="sr-only">Link to this function</span>
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</a>
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<span class="signature">terminate(state)</span>
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<a href="https://github.com/poanetwork/poa-netstats-wharehouse/blob/v0.1.0/lib/poa_backend/receivers/system/stats.ex#L43" class="view-source" rel="help" title="View Source">
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<span class="icon-code" aria-hidden="true"></span>
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<span class="sr-only">View Source</span>
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</a>
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</div>
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<section class="docstring">
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<p> This callback is called just before the Process goes down. This is a good place for closing connections.</p>
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<p>Callback implementation for <a href="POABackend.Receiver.html#c:terminate/1"><code class="inline">POABackend.Receiver.terminate/1</code></a>.</p>
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</section>
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</div>
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</section>
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<p>
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Built using
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<span class="line">
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designed by
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<a href="https://twitter.com/dignifiedquire" target="_blank" title="@dignifiedquire">Friedel Ziegelmayer</a>.
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