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Old 06-30-2004, 09:37 AM   #1
jdc32
Green Mole
 
Join Date: Jun 2004
Posts: 11
Thumbs up Automatic spider

hi there,

i want automate the adding of links to the se.
had anyone played too with this idea?

env:
i create a table, in this will stored any new links (a lot links). i call this table my linkspool.

so on,.. i have a cron job every 3 minutes which check, whether a new job (link) is in the spool table. if a new job is in there, the script lock the link and spider it. after the spidering the script delete the link in the spool. finished!

but i have two probs!!!!

first:
if a spider lasts over 3 minutes, it takes the next link from the spool and starts a new spider... thats okay... i check with the script how many spider are running, if it more than 5, the script will exit and wait to a thread is free.
this isnt work really good, how can i check with php how many php spider threads are opened??????????

second:
so with the cron, the spider maschine runs and runs and runs..... but if a spiderjob is locked, out any reason, it blocked the thread.
how can i kill via php the spider php pid which is older than 20 minutes and how kick the link from the se db.

sorry for my bad english

jdc
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Old 06-30-2004, 10:48 AM   #2
bloodjelly
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Join Date: Dec 2003
Posts: 106
Hi jdc -

If you have a main script (the one that looks at the linkspool and runs spider processes), keeping track of the number of spiders is easy. Just increment a counter every time a spider is called, and when your counter variable reaches 5, you can sleep the script for a period of time and then check again.

To kill the process, check out this thread: http://www.phpdig.net/showthread.php...&highlight=PID

But instead of using a CRON job, you could use exec() or system() commands through PHP.
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Old 07-01-2004, 12:08 AM   #3
jdc32
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Join Date: Jun 2004
Posts: 11
okay thats cool,
but with the cron i can kill the spider, but the link which the spider was spidering is still locked in the db. i need a search and destroy session

how can i give after kill the spider a parameter (ex. the site_id) to another script which delete all db entries for this link?

thx
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Old 07-01-2004, 12:17 AM   #4
jdc32
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Join Date: Jun 2004
Posts: 11
hmmm,.... after thinking, the cron is not really good....for my problem:

10 * * * * ps -ef | grep 'php -f spider.php' | awk '{print $2}' | xargs kill -9


i start any 3 minutes a new spider and shoult kill after 10 minutes,... so i have started more than 1 spider... this cron kill all my spider,.. thats no good.

can i kill via shell all php spiders which has a running time from 10 minutes?
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