Trevor Peirce wrote:
Mitch Thompson wrote:
[SATX_555_Extensions]
exten => 1212,1,System(cat /tmp/{orig_num}) ; ${orig_num} is set at
the beginning of [from-trunk-custom] to the full dialed digits in
${EXTEN}, before I break it down.
exten => 1212,n,Busy(); if the file exists, someone else has already
called this number, return busy
exten => 1212,102,System(echo ${UNIQUEID} > /tmp/${orig_num}) ;
basically, create a file in /tmp whose name is the full number from
the beginning. In this case, the full
; filename would be /tmp/2105551212. I don't really care about the
contents, though.
exten => 1212,103, Goto(Idle,1) ; from here, we jump to a new
extension called Idle, where we do a Random to decide whether to
simulate no one home (ring no answer) or
; we send ring for
about 10 seconds, then Answer() and play some .wav files, then
hangup. The last thing we do in either case is to delete
; the
/tmp/${orig_num} file.
The above code works very well at low call volumes. However, I'm
running into race conditions at high call volumes where several calls
are getting through the test in priority 1 before the file is created
in priority 102 (n+101).
Here's what I would do...
First, no System calls. Stay within asterisk.
I doubt this will get rid of all race conditions, but I imagine it
would at least reduce them.
exten => 1212,1,GotoIf($["${DB(/tmp/${orig_num})}" !=
"${UNIQUEID}"]?abort)
exten => 1212,1,Set(${DB(/tmp/${orig_num})}=${UNIQUEID})
exten => 1212,n,GotoIf($["${DB(/tmp/${orig_num})}" !=
"${UNIQUEID}"]?abort)
exten => 1212,n, Goto(Idle,1)
exten => 1212,n(abort),Busy()
Regards,
Trevor
Trevor,
Thank you very much for your response. Yes, I was worried about the
performance hit of the System() call, but as I said, I tried doing it
with Global and/or local variables, and just wound up confusing myself.
I'm not a programmer by trade or nature, so I knew up front it was
"dirty code". Your method of staying with Asterisk looks like something
I can easily switch to in one exchange context and give it a quick try.
Thanks again!
--
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--
Mitch Thompson, San Antonio, Texas//WB5UZG
Red Hat Certified Engineer
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