[Freeswitch-users] Lua Dialplan Application to turn down FS

[Bernhard Wendel]

Hi John,

what are you trying to tell me?
Since I'm new to LUA you make me wonder whether there is a syntax error 
within my code. It should pop up somewhere, shouldn't it? Because I 
haven't found one and the code is actually working.

Or am I missing something?

Regards,
Bernhard


Am 12.10.2014 17:21, schrieb John:
> It looks like the parentheses don't match on line 5.
>
> John
>
> On 12/10/14 11:45, Bernhard Wendel wrote:
>> Hi,
>>
>> I'm using the following Lua-Script to check whether a conference 
>> exists and only let a caller join if so.
>> The script is called via the following dialplan /<action 
>> application="lua" data="/path/to/script.lua $1" />///, where $1 is 
>> the destination number.
>>
>>
>>  1. -- Connect to a database
>>  2. local dbh = freeswitch.Dbh("pgsql://hostaddr=127.0.0.1
>>     dbname=database user=username password='password'
>>     application_name='my-lua-script'")
>>  3. assert(dbh:connected());
>>  4. -- Execute SQL
>>  5. dbh:query(string.format("SELECT COUNT(*) as \"MyCount\" FROM
>>     \"MyTable\" WHERE ColA = '%s'", argv[1]), function(row)
>>  6.     --freeswitch.consoleLog("INFO", "Results: " .. row.MyCount)
>> 7.
>>  8.     dbh:release()
>> 9.
>> 10.     if (row.MyCount== '1') then
>> 11.         freeswitch.consoleLog("INFO", "User is joining conference
>>     at " .. argv[1])
>>12.
>> 13.         session:answer()
>> 14.         session:execute("conference", argv[1] .. "@wideband")
>> 15.     end
>> 16.     session:hangup()
>> 17. end)
>>
>>
>> Line 8 instructs FS to return the postgres-Connection back to the 
>> pool - which is as expected. When a user now leaves the conference, 
>> FS throws this errors:
>>
>> 2014-10-12 10:32:30.065924 [DEBUG] switch_cpp.cpp:694 CoreSession::hangup
>> 2014-10-12 10:32:30.065924 [CRIT] switch_pgsql.c:368 An error 
>> occurred trying to consume input for query (200): connection pointer 
>> is NULL
>> 2014-10-12 10:32:30.065924 [CRIT] switch_pgsql.c:122 No DB Connection
>> 2014-10-12 10:32:30.065924 [ERR] switch_core_sqldb.c:1177 ERR: 
>> [SELECT COUNT(*) as "MyCount" FROM "MyTable" WHERE ColA = 
>> 'conf-1234'][connection pointer is NULL]
>> 2014-10-12 10:32:30.065924 [ERR] freeswitch_lua.cpp:446 DBH NOT 
>> Connected.
>> 2014-10-12 10:32:30.065924 [DEBUG] switch_cpp.cpp:1075 
>> sofia/internal/Alice at my.pbx.com destroy/unlink session from object
>>
>> Now, I could live with that. BUT: The problem is, that sometimes, 
>> when a user leaves the conference, FS crashes.
>> I've narrowed down the main cause to the above lua script. If I 
>> comment line 8 out, FS stops crashing. This will also stop FS from 
>> reusing Database-Connections.
>>
>> Now my questions:
>>
>>  1. I don't use `dbh` after line 8. So where does the error come from?
>>  2. How can I stop the error?
>>  3. How can I rewrite the lua script to have both a) non-crashing FS
>>     and b) reusing of connection?
>>
>>
>> Regards,
>> Bernhard
>>
>>
>>
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>
>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
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> http://www.cluecon.com
>
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