90 lines
3.4 KiB
HTML
90 lines
3.4 KiB
HTML
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<h1><a name="pnp_helper_functions" id="pnp_helper_functions">PNP Helper Functions</a></h1>
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<div class="level1">
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<p>
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PNP Helper functions are meant to simplify the creation of templates. In contrast to the rrd helper functions they don't call existing RRDtool functions.
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</p>
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</div>
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<!-- SECTION "PNP Helper Functions" [1-191] -->
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<h2><a name="pnpadjust_unit" id="pnpadjust_unit">pnp::adjust_unit</a></h2>
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<div class="level2">
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<p>
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(string,number,string,number) <strong>pnp::adjust_unit</strong> ( $value, $base=1000, $format='%.3lf' )
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</p>
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<p>
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The purpose of this function is to “normalize” large numbers. Modern hard disks have reached sizes of several <acronym title="Gigabyte">GB</acronym> or TB and looking at numbers like 1521073648234 you begin to count the digits so it would be more convienient to translate the value. The same applies to network traffic.
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</p>
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<p>
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The function takes up to three parameters and returns an array with four elements in any case.
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</p>
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<ul>
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<li class="level1"><div class="li"> The first parameter to be passed is the number (including an “UOM”, if applicable)</div>
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</li>
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<li class="level1"><div class="li"> The second parameter is optional and defaults to “1000” (e.g. traffic), but might be “1024” (e.g. disk size) as well</div>
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</li>
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<li class="level1"><div class="li"> The third parameter is optional, defaults to '%.3lf', and specifies the format of the value to be returned</div>
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</li>
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</ul>
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<pre class="code php"><span class="re0">$size</span> <span class="sy0">=</span> pnp<span class="sy0">::</span><span class="me2">adjust_unit</span><span class="br0">(</span><span class="nu0">1521073648234</span><span class="sy0">,</span><span class="nu0">1024</span><span class="sy0">,</span><span class="st_h">'%7.3lf'</span><span class="br0">)</span><span class="sy0">;</span></pre>
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<p>
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Please note that “$size” is an array consisting of four fields:
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</p>
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<pre class="code"> $size[0] := " 1.383 T"</pre>
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<p>
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contains the formatted value including the unit
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</p>
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<pre class="code"> $size[1] := "1.383"</pre>
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<p>
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contains the formatted number
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</p>
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<pre class="code"> $size[2] := "T"</pre>
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<p>
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contains the unit
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</p>
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<pre class="code"> $size[3] := "1099511627776"</pre>
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<p>
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contains the divisor
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</p>
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<p>
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Assuming check_disk returns “<acronym title="Megabyte">MB</acronym>” as UOM you can append that as well
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</p>
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<pre class="code php"><span class="re0">$disk</span> <span class="sy0">=</span> pnp<span class="sy0">::</span><span class="me2">adjust_unit</span><span class="br0">(</span><span class="st0">"1524MB"</span><span class="sy0">,</span><span class="nu0">1024</span><span class="sy0">,</span><span class="st_h">'%7.3lf'</span><span class="br0">)</span><span class="sy0">;</span></pre>
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<p>
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will result in
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$disk[0] := “1.448 <acronym title="Gigabyte">GB</acronym>”
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</p>
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<p>
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<a href="/_detail/templates/check_disk_1.png?id=pnp-0.6%3Atpl_helper_pnp" class="media" title="templates:check_disk_1.png"><img src="/_media/templates/check_disk_1.png" class="media" alt="" /></a><br/>
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“old” check_disk template with %s directive<br/>
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</p>
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<p>
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<a href="/_detail/templates/check_disk_2.png?id=pnp-0.6%3Atpl_helper_pnp" class="media" title="templates:check_disk_2.png"><img src="/_media/templates/check_disk_2.png" class="media" alt="" /></a><br/>
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“new” check_disk template with pnp::adjust_unit
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</p>
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</div>
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<!-- SECTION "pnp::adjust_unit" [192-] -->
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