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First pass of new node-info style

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Nick O'Leary
2017-04-05 16:19:23 +01:00
parent 28ea22f0e1
commit 262db23f7d
5 changed files with 202 additions and 91 deletions
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nodes/core/core/75-exec.html
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</script>
<script type="text/x-red" data-help-name="exec">
<p>Calls out to a system command.<br/></p>
<p><b>Inputs</b></p>
<ul><li><code>msg.payload</code> - optionally appended to the configured command.</li></ul>
<ul><li><code><i>msg.kill</i></code> - can be used to kill a running command, see below.</li></ul>
<ul><li><code><i>msg.pid</i></code> - can be used to kill a specific running command, see below.</li></ul>
<p><b>Outputs</b></p>
<ol>
<li>stdout, <code>msg.payload</code> containing the returned output from the command.</li>
<li>stderr, <code>msg.payload</code> containing any error output from the command.</li>
<li>return code, <code>msg.payload</code> containing the return (see below).</li>
<p>Calls out to a system command.</p>
<h3>Inputs</h3>
<dl class="message-properties">
<dt class="optional">msg.payload <span class="property-type">string</span></dt>
<dd>if configured to do so, will be appended to the executed command.</dd>
<dt class="optional">msg.kill <span class="property-type">string</span></dt>
<dd>the type of kill signal to send an existing exec node process.</dd>
<dt class="optional">msg.pid <span class="property-type">number|string</span></dt>
<dd>the process ID of an existing exec node process to kill.</dd>
</dl>
<h3>Outputs</h3>
<ol class="node-ports">
<li>Standard output
<dl class="message-properties">
<dt>msg.payload <span class="property-type">string</span></dt>
<dd>the standard output of the command.</dd>
</dl>
</li>
<li>Standard error
<dl class="message-properties">
<dt>msg.payload <span class="property-type">string</span></dt>
<dd>the standard error of the command.</dd>
</dl>
</li>
<li>Return code
<dl class="message-properties">
<dt>msg.payload <span class="property-type">number</span></dt>
<dd>the return code of the command.</dd>
</dl>
</li>
</ol>
<p><b>Details</b></p>
<h3>Details</h3>
<p>By default uses the <code>exec</code> system call which calls the command, waits for it to complete, and then
returns the output. For example a succesful command should have a return code of <code>{ code: 0 }</code>.</p>
returns the output. For example a successful command should have a return code of <code>{ code: 0 }</code>.</p>
<p>Optionally can use <code>spawn</code> instead, which returns the output from stdout and stderr
as the command runs, usually one line at a time. On completion it then returns a numeric return code
on the 3rd port. For example a successful command should return <code>0</code>.</p>
<p>The optional <b>append</b> gets added to the command after <code>msg.payload</code> - so you can do
things like pipe the result to another command.</p>
<p>Commands or parameters with spaces should be enclosed in quotes - <i>"This is a single parameter"</i></p>
on the 3rd port. For example, a successful command should return <code>0</code>.</p>
<p>The command that is run is defined within the node, with an option to append <code>msg.payload</code> and a further set of parameters.</p>
<p>Commands or parameters with spaces should be enclosed in quotes - <code>"This is a single parameter"</code></p>
<p>The returned <code>payload</code> is usually a <i>string</i>, unless non-UTF8 characters are detected, in which
case it contains a <i>buffer</i>.</p>
<p>The blue status icon and PID will be visible while the node is active. This can be read by a <code>status</code> node.</p>
case it is a <i>buffer</i>.</p>
<p>The node&apos;s status icon and PID will be visible while the node is active. Changes to this can be read by the <code>Status</code> node.</p>
<h4>Killing processes</h4>
<p>Sending <code>msg.kill</code> will kill a single active process. <code>msg.kill</code> should be a string containing
the type of signal to be sent, e.g. "SIGINT", "SIGQUIT", "SIGHUP", etc. Defaults to "SIGTERM" if blank ("").
If there is more than one process running then <code>msg.pid</code> must also be set with the value of the PID to be killed.</p>
<p><b>Tip</b>: If running a Python app you may need to use the <code>-u</code> parameter to stop the output being buffered.</p>
the type of signal to be sent, for example, <code>SIGINT</code>, <code>SIGQUIT</code> or <code>SIGHUP</code>. Defaults to <code>SIGTERM</code> if set to an empty string.</p>
<p>If the node has more than one process running then <code>msg.pid</code> must also be set with the value of the PID to be killed.</p>
<p>Tip: if running a Python app you may need to use the <code>-u</code> parameter to stop the output being buffered.</p>
</script>
<script type="text/javascript">