On 8/9/07, Julian Lyndon-Smith <asterisk at dotr.com>
wrote:>
> I have a need to have a GUID (for example,
> bcd47ccc-d7c9-ddb6-dc11-6746a770d77d [36 characters long including the
> "-"]) generated in the dialplan. Is there any asterisk function
that
> would do this ? I would prefer not to have to shell out every time a
> call comes in.
There's nothing built in that I know of. I had mused with the idea of
wrapping the available UUID generator code out there into a function and
offering it as a patch, but it's a low priority thing for me.
In the meantime, you could achieve what you want without the cost of
spinning up a shell process by writing a FastAGI app in Perl. Using the
modules Asterisk::FastAGI and Data::UUID, you could get a UUID back for the
cost of the socket connection.
This is a quick example that I coded up to do that - it was actually more
painful to install the modules from CPAN than code up the server itself:
--START--
#!/usr/bin/perl
#
use strict;
use warnings;
MyAGI->run( port => 4574 );
package MyAGI;
use base 'Asterisk::FastAGI';
use strict;
use Data::UUID;
my $uuid;
sub child_init_hook
{
$uuid = Data::UUID->new;
}
sub fastagi_handler
{
my $self = shift;
$self->agi->set_variable( UUID => $uuid->create_str() );
}
---END---
When run, this creates a pre-forking server with 5 children, which makes the
individual UUID generation about as cheap as you're going to get going
outside of the Asterisk process. When I execute that with agi debugging
turned on from this diaplan snippet:
exten => 7993,1,Answer
exten => 7993,n,AGI(agi://127.0.0.1:4574/fastagi_handler)
exten => 7993,n,SayAlpha(${UUID})
exten => 7993,n,Hangup
I get this:
-- Executing [7993 at from-internal-admin:1]
Answer("SIP/427-9df490e0", "")
in new stack
-- Executing [7993 at from-internal-admin:2]
AGI("SIP/427-9df490e0",
"agi://127.0.0.1:4574/fastagi_handler") in new stack
AGI Tx >> agi_network: yes
AGI Tx >> agi_network_script: fastagi_handler
AGI Tx >> agi_request: agi://127.0.0.1:4574/fastagi_handler
AGI Tx >> agi_channel: SIP/427-9df490e0
AGI Tx >> agi_language: en
AGI Tx >> agi_type: SIP
AGI Tx >> agi_uniqueid: 1186667018.723
AGI Tx >> agi_callerid: 427
AGI Tx >> agi_calleridname: James FitzGibbon
AGI Tx >> agi_callingpres: 0
AGI Tx >> agi_callingani2: 0
AGI Tx >> agi_callington: 0
AGI Tx >> agi_callingtns: 0
AGI Tx >> agi_dnid: 7993
AGI Tx >> agi_rdnis: unknown
AGI Tx >> agi_context: from-internal-admin
AGI Tx >> agi_extension: 7993
AGI Tx >> agi_priority: 2
AGI Tx >> agi_enhanced: 0.0
AGI Tx >> agi_accountcode:
AGI Tx >> CLI>
AGI Rx << SET VARIABLE UUID
"88AEDB9A-467E-11DC-9F13-8E31D47CEF85"
AGI Tx >> 200 result=1
-- AGI Script agi://127.0.0.1:4574/fastagi_handler completed, returning
0
-- Executing [7993 at from-internal-admin:3]
SayAlpha("SIP/427-9df490e0",
"88AEDB9A-467E-11DC-9F13-8E31D47CEF85") in new stack
And then Allison starts chattering out the digits of the UUID.
Hope that gives you something to work with.
--
j.
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