python_exec and parameters

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gmele

8 Feb 2017 8 Feb '17

3:47 a.m.

Hello, in our Kamailio, we are using python_exec to execute script used to send push notifications to Google or Apple. Currenty, the method we call only accepts the message as parameter. We then extract from the message the Call Id, to URI and from URI. Here is the python method signature: *def SendPushNotification(self, msg)* To extract the toUri and fromUri (and remove the sip:), we use python regex : *uriPattern=re.compile(".*sips?:(.+@[^>;]+)")* This is working well 99% of the time, except sometimes (we don't know why) where we get the error: *logger_LM_ERR(): Exception occurred: Traceback (most recent call last): File "mypythonExample.py", line XXX, in SendPushNotification requestUri = self.ExtractURIFromHeader(msg.getHeader("to")) File "mypythonExample.py", line XXX, in ExtractURIFromHeader m= self.uriPattern.match(header); TypeError: an integer is required* We tried to analyze the cause of this error, but we didn't find any problem with the message itself (the message is complete, with the *to *and *from *correctly filled). So, to avoid using the python regex, we have decided to pass parameters to the python script (callId, from and to URI): *def SendPushRequest(self, msg, fromUri, toUri, callid)* But it seems python_exec doesn't support more than 2 parameters ($mb and another one). Is this exact? If this is the case, how can we pass several parameters from kamailio.cfg? Thx for your help. Regards Giovanni -- View this message in context: http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803… Sent from the Users mailing list archive at Nabble.com.

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Daniel-Constantin Mierla

9 Feb 9 Feb

3:31 a.m.

Hello, not very familiar with the app_python initial design, but when I added kemi support in it for kamailio 5.0, I think I noticed the limitation of 1 extra parameter. Probably you can encode your parameters in comma separated value, so you can parse it easier in the python script, as opposite to parsing the entire message buffer. An alternative may be getting the value for $fu or $tu if python offers the api for getting/setting pseudo-variables -- these are for sure in kemi exports to python. Of course, if anyone adds support for more parameters, then it will be accepted inside kamailio repo. Cheers, Daniel On 08/02/2017 09:47, gmele wrote:

...

Konstantin M.

10:47 a.m.

That's correct, it accepts only one parameter for now. After many years our company has switched to kamailio, I'm actively working on new version of app_python, more flexible and usable than current one, many new features... I'm not ready to push new changes to current module due to raw alpha and unstable work. Right now. as workaround you can pass something like $_s($fu!!$tu) and then in python parse them with from_user, to_user = $param1.split("!!") 2017-02-09 11:31 GMT+03:00 Daniel-Constantin Mierla <miconda(a)gmail.com>om>:

...

Hello, in our Kamailio, we are using python_exec to execute script used to send push notifications to Google or Apple. Currenty, the method we call only accepts the message as parameter. We

then

extract from the message the Call Id, to URI and from URI. Here is the python method signature: *def SendPushNotification(self, msg)* To extract the toUri and fromUri (and remove the sip:), we use python

regex

: *uriPattern=re.compile(".*sips?:(.+@[^>;]+)")* This is working well 99% of the time, except sometimes (we don't know

why)

where we get the error: *logger_LM_ERR(): Exception occurred: Traceback (most recent call last): File "mypythonExample.py", line XXX, in SendPushNotification requestUri = self.ExtractURIFromHeader(msg.getHeader("to")) File "mypythonExample.py", line XXX, in ExtractURIFromHeader m= self.uriPattern.match(header); TypeError: an integer is required* We tried to analyze the cause of this error, but we didn't find any

problem

with the message itself (the message is complete, with the *to *and *from *correctly filled). So, to avoid using the python regex, we have decided to pass parameters

the python script (callId, from and to URI): *def SendPushRequest(self, msg, fromUri, toUri, callid)* But it seems python_exec doesn't support more than 2 parameters ($mb and another one). Is this exact? If this is the case, how can we pass several parameters from kamailio.cfg? Thx for your help. Regards Giovanni -- View this message in context: http://sip-router.1086192.n5.

nabble.com/python-exec-and-parameters-tp155803.html

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-- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - www.asipto.com Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

gmele

10 Feb 10 Feb

1:55 a.m.

Daniel-Constantin Mierla

5:40 a.m.

Hello, what version of kamailio are you using? Cheers, Daniel On 10/02/2017 07:55, gmele wrote:

...

Hello, thx for the info. We will check if we wait for an enhanced version of python_exec or pass the parameters in a string. Regards Giovanni -- View this message in context: http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803… Sent from the Users mailing list archive at Nabble.com. _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

gmele

5:46 a.m.

Hello, we are using 4.4.2. Giovanni -- View this message in context: http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803… Sent from the Users mailing list archive at Nabble.com.

gmele

5:52 a.m.

I tested passing the parameter as suggested by Konstantin and it works fine: In kamailio.cfg : /python_exec("SendPushNotification", $_s($tU@$td!!$fU@$fd!!$ci)); / In our python script: / def SendPushNotification(self, msg, parameters): requestUri = "" fromUri = "" callId = "" try: # Extract the message fields requestUri, fromUri, callId = parameters.split("!!") *... */ All is working fine on our servers... Regards Giovanni -- View this message in context: http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803… Sent from the Users mailing list archive at Nabble.com.

Daniel-Constantin Mierla

6:14 a.m.

OK.

...

From the code, I noticed that the old API (before kemi), it exports a

getHeader(...) method to Python API. Just for sake of completion - starting with 5.0, there are more methods available, including a method to retrieve the value of any kamailio cfg variable, like in: - https://github.com/kamailio/kamailio/blob/master/misc/examples/kemi/kamaili… Cheers, Daniel On 10/02/2017 11:52, gmele wrote:

...

Daniel-Constantin Mierla

4:20 a.m.

On 09/02/2017 16:47, Konstantin M. wrote:

...

If you haven't seen it, note the addition of support for kemi in the app_python. That should be preserved.

...

Right now. as workaround you can pass something like $_s($fu!!$tu) and then in python parse them with from_user, to_user = $param1.split("!!")

Quickly looking in the source code, the function doesn't evaluate the variables in the parameters. I will try to fix it soon. Cheers, Daniel

...

2017-02-09 11:31 GMT+03:00 Daniel-Constantin Mierla <miconda(a)gmail.com <mailto:miconda@gmail.com>>: Hello, not very familiar with the app_python initial design, but when I added kemi support in it for kamailio 5.0, I think I noticed the limitation of 1 extra parameter. Probably you can encode your parameters in comma separated value, so you can parse it easier in the python script, as opposite to parsing the entire message buffer. An alternative may be getting the value for $fu or $tu if python offers the api for getting/setting pseudo-variables -- these are for sure in kemi exports to python. Of course, if anyone adds support for more parameters, then it will be accepted inside kamailio repo. Cheers, Daniel On 08/02/2017 09:47, gmele wrote:

Hello, in our Kamailio, we are using python_exec to execute script used

to send

push notifications to Google or Apple. Currenty, the method we call only accepts the message as

parameter. We then

extract from the message the Call Id, to URI and from URI. Here is the python method signature: *def SendPushNotification(self, msg)* To extract the toUri and fromUri (and remove the sip:), we use

python regex

: *uriPattern=re.compile(".*sips?:(.+@[^>;]+)")* This is working well 99% of the time, except sometimes (we don't

know why)

where we get the error: *logger_LM_ERR(): Exception occurred: Traceback (most recent

call last):

File "mypythonExample.py", line XXX, in SendPushNotification requestUri = self.ExtractURIFromHeader(msg.getHeader("to")) File "mypythonExample.py", line XXX, in ExtractURIFromHeader m= self.uriPattern.match(header); TypeError: an integer is required* We tried to analyze the cause of this error, but we didn't find

any problem

with the message itself (the message is complete, with the *to

*and *from

*correctly filled). So, to avoid using the python regex, we have decided to pass

parameters to

the python script (callId, from and to URI): *def SendPushRequest(self, msg, fromUri, toUri, callid)* But it seems python_exec doesn't support more than 2 parameters

($mb and

another one). Is this exact? If this is the case, how can we

pass several

parameters from kamailio.cfg? Thx for your help. Regards Giovanni -- View this message in context:

http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803… <http://sip-router.1086192.n5.nabble.com/python-exec-and-parameters-tp155803.html>

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<http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users> -- Daniel-Constantin Mierla www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda> Kamailio Advanced Training - Mar 6-8 (Europe) and Mar 20-22 (USA) - www.asipto.com <http://www.asipto.com> Kamailio World Conference - May 8-10, 2017 - www.kamailioworld.com <http://www.kamailioworld.com> _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org <mailto:sr-users@lists.sip-router.org> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users <http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users>

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Daniel-Constantin Mierla
gmele
Konstantin M.