Vieri
l33t
Joined: 18 Dec 2005
Posts: 874
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 Posted: Tue Sep 18, 2018 9:00 am Post subject: php script to read and send a stream of chars to remote clie |
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Hi,
Please consider the following simple scenario.
In one Gentoo console (console 1) I run these commands:
| Code: | # echo "Line1" >> /tmp/test.txt
# echo "Line2 OPTION and HTTP and more." >> /tmp/test.txt
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and in another console (console 2) I run the following at the same time:
| Code: | # tail -n 0 -f /tmp/test.txt | grep -E '.*OPTION.*HTTP.*'
Line2 OPTION and HTTP and more.
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Of course, the latter filtered result is expected.
Now, I'd like to do the same, but via HTTP.
So I keep running the following in console 1 over and over:
| Code: | # echo "Line2 OPTION and HTTP and more." >> /tmp/test.txt
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I set up a PHP script as so:
| Code: | # cat test_popen.php
<?php
if ($_SERVER['REQUEST_METHOD']=='POST') {
$input = filter_input_array(INPUT_POST);
} else {
$input = filter_input_array(INPUT_GET);
}
if ($input['action'] === 'view') {
header('Content-Type: text/html; charset=utf-8');
$cmd_run = "tail -n 0 -f /tmp/test.txt";
if (strlen($input['filter']) > 0)
$cmd_run .= " | grep -E '".$input['filter']."'";
echo "Starting CMD=$cmd_run\n";
ob_flush();
flush();
$po = popen($cmd_run, "r");
while ($l = fgets($po, 32)) {
echo $l;
ob_flush();
flush();
}
pclose($po);
}
?> |
and in console 2 I run this HTTP client:
| Code: | # curl 'http://localhost/test/test_popen.php?action=view&filter=.*OPTION.*HTTP.*'
Starting CMD=tail -n 0 -f /tmp/test.txt | grep -E '.*OPTION.*HTTP.*'
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That's all I see despite the fact that I'm still running the commands in console 1.
The only way I can get any output is if I run this in console 2:
| Code: | # curl 'http://localhost/test/test_popen.php?action=view'
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So I guess my mistake must be with the | pipe right before grepping and calling popen on that.
How can I fix this?
The goal is to continuously send a filtered log file via HTTP.
Thanks |
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