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<h1 class="page-title">Event Scheduler</h1>
<h2 id="event-scheduler">Event Scheduler</h2>
<p>The ENiGMA½ scheduler allows system operators to configure arbitrary events that can can fire based on date and/or time, or by watching for changes in a file. Events can kick off internal handlers, custom modules, or binaries &amp; scripts.</p>
<h2 id="scheduling-events">Scheduling Events</h2>
<p>To create a scheduled event, create a new configuration block in <code class="language-plaintext highlighter-rouge">config.hjson</code> under <code class="language-plaintext highlighter-rouge">eventScheduler.events</code>.</p>
<p>Events can have the following members:</p>
<table>
<thead>
<tr>
<th>Item</th>
<th>Required</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="language-plaintext highlighter-rouge">schedule</code></td>
<td><img class="emoji" title=":+1:" alt=":+1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png" height="20" width="20"></td>
<td>A <a href="https://bunkat.github.io/later/parsers.html#text">Later style</a> parsable schedule string such as <code class="language-plaintext highlighter-rouge">at 4:00 am</code>, or <code class="language-plaintext highlighter-rouge">every 24 hours</code>. Can also be (or contain) an <code class="language-plaintext highlighter-rouge">@watch</code> clause. See <strong>Schedules</strong> below for details.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">action</code></td>
<td><img class="emoji" title=":+1:" alt=":+1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44d.png" height="20" width="20"></td>
<td>Action to perform when the schedule is triggered. May be an <code class="language-plaintext highlighter-rouge">@method</code> or <code class="language-plaintext highlighter-rouge">@execute</code> spec. See <strong>Actions</strong> below.</td>
</tr>
<tr>
<td><code class="language-plaintext highlighter-rouge">args</code></td>
<td><img class="emoji" title=":-1:" alt=":-1:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f44e.png" height="20" width="20"></td>
<td>An array of arguments to pass along to the method or binary specified in <code class="language-plaintext highlighter-rouge">action</code>.</td>
</tr>
</tbody>
</table>
<h3 id="schedules">Schedules</h3>
<p>As mentioned above, <code class="language-plaintext highlighter-rouge">schedule</code> may contain a <a href="https://bunkat.github.io/later/parsers.html#text">Later style</a> parsable schedule string and/or an <code class="language-plaintext highlighter-rouge">@watch</code> clause.</p>
<p><code class="language-plaintext highlighter-rouge">schedule</code> examples:</p>
<ul>
<li><code class="language-plaintext highlighter-rouge">every 2 hours</code></li>
<li><code class="language-plaintext highlighter-rouge">on the last day of the week</code></li>
<li><code class="language-plaintext highlighter-rouge">after 12th hour</code></li>
</ul>
<p>An <code class="language-plaintext highlighter-rouge">@watch</code> clause monitors a specified file for changes and takes the following form: <code class="language-plaintext highlighter-rouge">@watch:&lt;path&gt;</code> where <code class="language-plaintext highlighter-rouge">&lt;path&gt;</code> is a fully qualified path.</p>
<blockquote>
<p><img class="emoji" title=":bulb:" alt=":bulb:" src="https://github.githubassets.com/images/icons/emoji/unicode/1f4a1.png" height="20" width="20"> If you would like to have a schedule <strong>and</strong> watch a file for changes, place the <code class="language-plaintext highlighter-rouge">@watch</code> clause second and separated with the word <code class="language-plaintext highlighter-rouge">or</code>. For example: <code class="language-plaintext highlighter-rouge">every 24 hours or @watch:/path/to/somefile.txt</code>.</p>
</blockquote>
<h3 id="actions">Actions</h3>
<p>Events can kick off actions by calling a method (function) provided by the system or custom module in addition to executing arbritary binaries or scripts.</p>
<h4 id="methods">Methods</h4>
<p>An action with a <code class="language-plaintext highlighter-rouge">@method</code> can take the following forms:</p>
<ul>
<li>
<code class="language-plaintext highlighter-rouge">@method:/full/path/to/module.js:methodName</code>: Executes <code class="language-plaintext highlighter-rouge">methodName</code> at <code class="language-plaintext highlighter-rouge">/full/path/to/module.js</code>.</li>
<li>
<code class="language-plaintext highlighter-rouge">@method:rel/path/to/module.js:methodName</code>: Executes <code class="language-plaintext highlighter-rouge">methodName</code> using the <em>relative</em> path <code class="language-plaintext highlighter-rouge">rel/path/to/module.js</code>. Paths for <code class="language-plaintext highlighter-rouge">@method</code> are relative to the ENiGMA½ installation directory.</li>
</ul>
<p>Methods are passed any supplied <code class="language-plaintext highlighter-rouge">args</code> in the order they are provided.</p>
<h5 id="method-signature">Method Signature</h5>
<p>To create your own method, simply <code class="language-plaintext highlighter-rouge">export</code> a method with the following signature: <code class="language-plaintext highlighter-rouge">(args, callback)</code>. Methods are executed asynchronously.</p>
<p>Example:</p>
<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">// my_custom_mod.js</span>
<span class="nx">exports</span><span class="p">.</span><span class="nx">myCustomMethod</span> <span class="o">=</span> <span class="p">(</span><span class="nx">args</span><span class="p">,</span> <span class="nx">cb</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="p">{</span>
<span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">`Hello, </span><span class="p">${</span><span class="nx">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]}</span><span class="s2">!`</span><span class="p">);</span>
<span class="k">return</span> <span class="nx">cb</span><span class="p">(</span><span class="kc">null</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div></div>
<h4 id="executables">Executables</h4>
<p>When using the <code class="language-plaintext highlighter-rouge">@execute</code> action, a binary or script can be executed. A full path or just the binary name is acceptable. If using the form without a path, the binary much be in ENiGMA½’s <code class="language-plaintext highlighter-rouge">PATH</code>.</p>
<p>Examples:</p>
<ul>
<li><code class="language-plaintext highlighter-rouge">@execute:/usr/bin/foo</code></li>
<li><code class="language-plaintext highlighter-rouge">@execute:foo</code></li>
</ul>
<p>Just like with methods, any supplied <code class="language-plaintext highlighter-rouge">args</code> will be passed along.</p>
<h2 id="example-entries">Example Entries</h2>
<p>Post a message to supplied networks every Monday night using the message post mod (see modding):</p>
<pre><code class="language-hjson">eventScheduler: {
events: {
enigmaAdToNetworks: {
schedule: at 10:35 pm on Mon
action: @method:mods/message_post_evt/message_post_evt.js:messagePostEvent
args: [
"fsx_bot"
"/home/enigma-bbs/ad.asc"
]
}
}
}
</code></pre>
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