[sr-dev] t_suspend and t_continue in tm module
Daniel-Constantin Mierla
miconda at gmail.com
Sat Jul 6 19:48:20 CEST 2013
Hello,
the patch cannot be applied as it is. The comments contain references to
request processing, which is obviously wrong. Then I have seen code
specific to requests, like managing the request uri or dst uri -- these
fields shouldn't be set for replies, it's ok as safety to clear them up,
but not cloning.
From the patch I see the new function are only for internal usage, not
for config file. Are they supposed to be used only in the transaction
context (i.e., after the transaction is matched for reply)?
Cheers,
Daniel
On 7/4/13 5:24 PM, Richard Good wrote:
> Hi
>
> I've finally got working functionality for t-suspend and t_continue
> for SIP responses in the tmp/tm_async_reply_support branch.
>
> I've memory and load tested the branch and have also isolated the
> changes so that if there are problems they will only be experienced if
> you use the new API functions.
>
> However keeping mind that TM can be tricky to program (as mentioned in
> the documentation ;)) - I've included below a summary of the changes
> and a git diff against the latest master. So the TM experts can have
> a look and see if there are any obvious problems.
>
> If there are no complaints or queries I will commit the changes to
> master next week Friday (July 12).
>
> Regards
> Richard.
>
> Change summary:
> 1. parser/msg_parser.h: added new message state FL_RPL_SUSPENDED
> 2. tm_load.c: new api functions: *t_suspend_reply*,
> *t_continue_reply* and *t_cancel_suspend_reply*
> 3. t_suspend.c/h: new methods: *t_suspend_reply*, *t_continue_reply*
> and *t_cancel_suspend_reply
> *4. tm/t_reply.c: if msg is in state FL_RPL_SUSPENDED then we skip
> sending the reply on
> 5. tm/t_reply.c/h: new methods to fake env for responses:
> *faked_env_resp, faked_resp, free_faked_resp
> *
> 6. API documentation to include new functions: *t_suspend_reply*,
> *t_continue_reply* and *t_cancel_suspend_reply
>
> *
> *
> *
> *
> *
>
>
>
>
>
> On 18 March 2013 14:13, Richard Good <richard.good at smilecoms.com
> <mailto:richard.good at smilecoms.com>> wrote:
>
> Hi Daniel and other TM experts
>
> We have been working on a prototype for being able to use the
> t_suspend() and t_continue() methods for SIP responses. The
> version in branch /tmp/tm_async_reply_support is working, though
> still needs to be 100% tested and only works for 1 branch (i.e. no
> forking)
>
> Would it be possible for you to have a look at this branch code
> and see if we are on the right track. The code is working but TM
> (as mentioned in the documentation ;)) can be tricky to program
> and we want to make sure we are not breaking anything, as the goal
> is to get this into the master branch.
>
> The changes we have done:
>
> 1. parser/msg_parser.h: added new message state FL_RPL_SUSPENDED
> 2. tm/h_table.h: added int suspended_request to ua_server and int
> suspended_reply to ua_client
> 3. tm/t_suspend.c:t_suspend
> 1. Changed suspend method to check if the message is a
> request or response and set the
> suspended_request/suspended_reply variable accordingly
> 2. If its a request we do as the existing code
> 3. If its a response we get the correct uac branch, clone the
> msg into t->uac[branch].reply and set the msg state to
> FL_RPL_SUSPENDED
> 4. tm/t_reply.c: if msg is in state FL_RPL_SUSPENDED then we skip
> sending the reply on
> 5. tm/t_suspend.c:t_continue
> 1. Check if this uas was suspended - if so this is a continue
> for a request so continue with existing code
> 2. If not then we search for the branch that was suspended
> 3. Once branch is found unsuspend the message state
> 4. do pre-script, run_top_route and post scripts
> 5. Relay the reply using basically the same code we skipped
> in step 4
>
> First next step after we confirm we are on the right track is to
> add forking support - this will require a new t_continue method
> where the calling application passes in the branch of the
> suspended reply when wanting to continue.
>
> Any comments/feedback would be appreciated.
>
> Regards
>
> Richard.
>
>
>
>
>
>
>
> On 11 March 2013 14:34, Daniel-Constantin Mierla
> <miconda at gmail.com <mailto:miconda at gmail.com>> wrote:
>
> Hello,
>
> t_suspend() and t_continue() are only for requests at this moment.
>
> Cheers,
> Daniel
>
>
> On 3/6/13 2:49 PM, Richard Good wrote:
>> Hi
>>
>> We are using the t_suspend and t_continue functionality to
>> asynchronously send Diameter messages.
>>
>> This works nicely when we suspend and resume on a SIP
>> request. However in some circumstances we want to send a
>> Diameter message on a SIP response.
>>
>> I have found that the SIP responses continue to be relayed
>> despite being suspended and returning 0 to the cfg file.
>>
>> I am investigating the cause but before I get any deeper does
>> anyone know if the t_suspend and t_continue functionality in
>> the tm module can be used on a SIP response?
>>
>> Regards
>> Richard.
>>
>>
>>
>> This email is subject to the disclaimer of Smile Communications (PTY) Ltd. athttp://www.smilecoms.com/disclaimer
>>
>>
>>
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>>
>>
>
> --
> Daniel-Constantin Mierla -http://www.asipto.com
> http://twitter.com/#!/miconda <http://twitter.com/#%21/miconda> -http://www.linkedin.com/in/miconda
> Kamailio World Conference, April 16-17, 2013, Berlin
> -http://conference.kamailio.com -
>
>
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--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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