How do I monitor perl script from php

Question

I'm have a long-running perl script that outputs the percentage complete. How do I show the completion status real-time on a php page?

Example:

perl:

my $i = 0;
for $i (1 .. 6) {
    print "$i\n";
    sleep 1;
}
print "script end\n";
exit;

php:

echo passthru('perl testprint.pl');

This works to display the output, but not real-time.

How does it output? A new percentage on each line? Backspacing over the old percentage with the idea that it would never be parsed? — jordanm
– jordanm, Commented Feb 23, 2012 at 20:01
The perl script currently outputs a new percentage on each line. However I can rewrite it if necessary. — Isius
– Isius, Commented Feb 23, 2012 at 20:03

Matt K · Accepted Answer · 2012-02-23 20:16:23Z

1

Modify your perl script to pipe the output to a flat file. Use a php script to parse this file and output in whatever format you want.

You could call the php script from your html page using ajax, or if you save the perl script in the server's CGI directory you can call it directly without the need for the extra php file.

Lastly, create a nifty progress bar and profit.

answered Feb 23, 2012 at 20:16

Matt K

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2 Comments

Isius Over a year ago

I think you're pointing me in the right direction. But would proc_open be of better use here?

Matt K Over a year ago

I'm not familiar with that function but it seems like it could be dangerous if executed on a publicly accessible site or on a shared hosting server. maybe update your question with that suggestion and someone else more knowledgeable can chime in?

Andreas Stokholm · Accepted Answer · 2012-02-23 20:00:43Z

0

For that you need to utilize AJAX.

I would have a PHP script that looks at the status, and then have AJAX update the status for the user to see.

answered Feb 23, 2012 at 20:00

Andreas Stokholm

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2 Comments

Isius Over a year ago

Ok, but how do I monitor the status without re-executing the script?

Andreas Stokholm Over a year ago

In that case you need the Perl script to create a socket to the browser and keeping the connection open for further updates. PHP does not have the ability to do this without hogging the servers resources.

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