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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>Migration of Existing PHP Scripts to Script Server</TITLE
><META
NAME="GENERATOR"
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TITLE="The Cacti Manual"
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TITLE="PHP Script Server"
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TITLE="Upgrade Steps for the Example HostMib Data Queries"
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><A
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>Chapter 14. PHP Script Server</TD
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><DIV
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><H1
CLASS="SECT1"
><A
NAME="MIGRATION_PHP_SCRIPTS_TO_SCRIPT_SERVER"
>Migration of Existing PHP Scripts to Script Server</A
></H1
><P
> If you have other PHP scripts that you wish to migrate, you must follow the steps below to
migrate your scripts to the PHP Script Server required format.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="SCRIPT_FILE_CHANGES"
>Script File Changes</A
></H2
><P
> Each PHP Script file must be changed to the new Script Server format. The changes are
not dramatic, but required for the proper operation of the PHP Script Server. Follow the
steps below to complete.
</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Copy you existing script to a new name. The name must begin "ss_" followed by your script
name. The "ss_" identifies the script as being a script server variety of the a PHP script.
For example, if you previously had a script called "get_mysql_stats.php", it's new name would
be "ss_get_mysql_stats.php".
</P
></LI
><LI
><P
> Edit the new PHP script and add the following required lines to the file, where "ss_myfunction"
is the same as your filename.
</P
><PRE
CLASS="PROGRAMLISTING"
><?php
$no_http_headers = true;
/* display No errors */
error_reporting(E_ERROR);
include_once(dirname(__FILE__) . "/../include/config.php");
include_once(dirname(__FILE__) . "/../lib/snmp.php");
if (!isset($called_by_script_server)) {
array_shift($_SERVER["argv"]);
print call_user_func_array("ss_myfunction", $_SERVER["argv"]);
}</PRE
></LI
><LI
><P
> What was originally just mainline code, must be replaced with a function name. For example,
if your program previously contained the following three lines of code:
</P
><PRE
CLASS="PROGRAMLISTING"
><?php
$a = 100;
$b = $a / 10;
print $b;
?></PRE
><P
> Would become:
</P
><PRE
CLASS="PROGRAMLISTING"
>function ss_myfunction() {
$a = 100;
$b = $a / 10;
Print $b;
}</PRE
></LI
><LI
><P
> If you have any additional functions declared within your script file, you must prefix them to
make them unique amongst all functions. Our recommendation would be to prefix all functions with
the name of the main function. For example if you have a function called "meme" you would rename
it to "ss_myfunction_meme". This guarantee's correct Script Server functionality.
</P
></LI
><LI
><P
> The last step is to change the function call that could have traditionally returned the value to the
Cacti poller using the PRINT function. You must change that line or lines in your code to utilize
the RETURN function instead. However, this does not apply to PRINT statements that are not called
from the Poller. For a simple script, this results in
</P
><PRE
CLASS="PROGRAMLISTING"
>function ss_myfunction() {
$a = 100;
$b = $a / 10;
Return $b;
}</PRE
><P
> Be careful, when writing <SPAN
CLASS="GUILABEL"
>Script Server Data Queries</SPAN
>.
Use the RETURN function for returning results of the GET operation.
But use PRINT for INDEX and QUERY operations, e.g.
</P
><PRE
CLASS="PROGRAMLISTING"
> if (($cmd == "index")) {
...
print $some_index_data . "\n";
}
} elseif ($cmd == "query") {
...
print $some_query_data . "\n";
} elseif ($cmd == "get") {
...
result $some_get_data;
}
</PRE
></LI
></OL
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="XML_FILE_CHANGES"
>XML File Changes</A
></H2
><P
> If you are using a "Script Query" type function, then you must also change your XML file. Please reference
the XML files in the <TT
CLASS="FILENAME"
><path_cacti>/resource/script_server</TT
> directory for the
specifics related to your required modifications. However, you may also follow the instructions below:
</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Modify the <script_path> tag. Change it from:
</P
><PRE
CLASS="PROGRAMLISTING"
><script_path>|path_php_binary| -q |path_cacti|/scripts/myfucntion.php</script_path></PRE
><P
> to simply the following:
</P
><PRE
CLASS="PROGRAMLISTING"
><script_path>|path_cacti|/scripts/ss_myfunction.php</script_path></PRE
></LI
><LI
><P
> Add the following two XML tags below the <script_path> tag. Replace <B
CLASS="EMPHASIS"
>ss_myfunction</B
>
with your function name:
</P
><PRE
CLASS="PROGRAMLISTING"
><script_function>ss_myfunction</script_function>
<script_server>php</script_server></PRE
></LI
><LI
><P
> Save the XML file.
</P
></LI
></OL
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="DATA_QUERY_DATA_TEMPLATE_CHANGES"
>Data Query & Data Template Changes</A
></H2
><P
> Your Data Queries and Data Templates must be also changed. Although somewhat self explanatory by
now, you must make the following changes:
</P
><P
></P
><OL
TYPE="1"
><LI
><P
> Change it's Input Method to "Get Script Server Data" or "Get Script Server Data (Index)" depending
on it's type.
</P
><P
> Change the XML file path to point to the new XML file in the <TT
CLASS="FILENAME"
><path_cacti>/resources/script_server/*.xml</TT
> path.
</P
><P
> For all data templates that use the data query you must change their "Data Input Method" accordingly.
</P
></LI
></OL
><P
> Your final step is to go to the <SPAN
CLASS="GUILABEL"
>System Utilities</SPAN
> and <SPAN
CLASS="GUILABEL"
>Clear
Poller Cache</SPAN
> to apply the new settings. If you script is operating correctly,
you should now be migrated to the script server.
</P
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