Event-lock, sync/async on outbound ESL and execute() tagging question
Hi All I'm trying to understand setEventLock and setAsyncExecute parameters on outbound ESL socket. My aim is to have ability to choose execution method of freeswitch dialplan command via execute(). I'm using async full, but I want to use sync mode for some applications for which I don't want to receive events, for example. Is there a way to run application in sync mode and just get return value, and discard its events? I want this because If later I will run some app in async mode, I'll get previous events like 'CHANNEL_EXECUTE_COMPLETE' and so on. Another approach is to have ability to mark calls to execute or API with some tag to distinguish between events from previous execute() or api() calls, like with BGAPI job id. What can be done to achieve this? Or maybe I should just process all events by myself if I use async? And finally, could anybody explain the Event-Lock / AsyncExecute difference? Seems I can't really understand the wiki notes about that. -- Best regards, Dmitry Sytchev, IT Engineer
Hi, Eventlock is used to say "Whether to queue the commands or not". Assume I'm giving playback and bridge command via outbound socket to freeswitch. If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed. If eventlock is "false", then order of execution is not guaranteed. I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations. This works well for me. On Wed, Mar 23, 2011 at 1:21 PM, Dmitry Sytchev <kbdfck@gmail.com> wrote:
Hi All
I'm trying to understand setEventLock and setAsyncExecute parameters on outbound ESL socket. My aim is to have ability to choose execution method of freeswitch dialplan command via execute(). I'm using async full, but I want to use sync mode for some applications for which I don't want to receive events, for example. Is there a way to run application in sync mode and just get return value, and discard its events?
I want this because If later I will run some app in async mode, I'll get previous events like 'CHANNEL_EXECUTE_COMPLETE' and so on. Another approach is to have ability to mark calls to execute or API with some tag to distinguish between events from previous execute() or api() calls, like with BGAPI job id. What can be done to achieve this?
Or maybe I should just process all events by myself if I use async?
And finally, could anybody explain the Event-Lock / AsyncExecute difference? Seems I can't really understand the wiki notes about that.
-- Best regards,
Dmitry Sytchev, IT Engineer
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On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy <lakindia89@gmail.com>wrote:
Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
I understand this. I use outbound async full ESL mode, launching socket app from dialplan, because in sync mode I have some problems with bridge app and I need to catch parent channel hangup and server disconnection. I written wrapper around ESL.pm to implement executeSync which waits for CHANNEL_EXECUTE_COMPLETE while in async mode, works for now. But of course it is not the best way, because of possible error when 'execute' is used before my 'executeSync' by mistake and without proper event handling so that CHANNEL_EXECUTE_COMPLETE from previous app is catched by my wrapper and it returns prematurely. This is why I want to have some tag I can mark execute call to filter its events later... Maybe there is better way? 2011/3/23 Michael Collins <msc@freeswitch.org>
On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy < lakindia89@gmail.com> wrote:
Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
http://wiki.freeswitch.org/wiki/Event_socket
-MC
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Best regards, Dmitry Sytchev, IT Engineer
I use outbound socket for bridging, I also do my accounting from there too, As soon as I get the CHANNEL_ANSWER event with the direction:outbound (in content) I defer a new process and create a timer which does 6 seconds billing increments. The trick for not receiving events irrelevant to my session was issuing following at the beginning of my session: filter unique-id <uuid>\n\n filter channel-call-uuid <uuid>\n\n I wrote my server in Ruby, I'm using EventMachine for TCP handling and Ruby Fibers to write my apps synchronous fashion while talking to FreeSWITCH in async mode. Whenever I need to simulate the blocking mode and pause the execution at some point (with Fibers) I just start listening for the event that has do be received which indicates the job is done, in case of bridge, I enqueue the CHANNEL_HANGUP_COMPLETE and resume my app as soon as I receive it. Moe On Wed, Mar 23, 2011 at 1:41 PM, Dmitry Sytchev <kbdfck@gmail.com> wrote:
I understand this. I use outbound async full ESL mode, launching socket app from dialplan, because in sync mode I have some problems with bridge app and I need to catch parent channel hangup and server disconnection.
I written wrapper around ESL.pm to implement executeSync which waits for CHANNEL_EXECUTE_COMPLETE while in async mode, works for now. But of course it is not the best way, because of possible error when 'execute' is used before my 'executeSync' by mistake and without proper event handling so that CHANNEL_EXECUTE_COMPLETE from previous app is catched by my wrapper and it returns prematurely. This is why I want to have some tag I can mark execute call to filter its events later... Maybe there is better way?
2011/3/23 Michael Collins <msc@freeswitch.org>
On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy < lakindia89@gmail.com> wrote:
Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
http://wiki.freeswitch.org/wiki/Event_socket
-MC
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-- Best regards,
Dmitry Sytchev, IT Engineer
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
I don't get any irrelevant channel events, it's my events or my child channel events. I want to distinguish events from previously launched execute() commands in my event loop, like job id in bgapi. These events can be from my own original channel as well, so uuid filter doesn't help me. 2011/3/24 Moe Navid <manavid@gmail.com>
I use outbound socket for bridging, I also do my accounting from there too, As soon as I get the CHANNEL_ANSWER event with the direction:outbound (in content) I defer a new process and create a timer which does 6 seconds billing increments.
The trick for not receiving events irrelevant to my session was issuing following at the beginning of my session:
filter unique-id <uuid>\n\n filter channel-call-uuid <uuid>\n\n
I wrote my server in Ruby, I'm using EventMachine for TCP handling and Ruby Fibers to write my apps synchronous fashion while talking to FreeSWITCH in async mode. Whenever I need to simulate the blocking mode and pause the execution at some point (with Fibers) I just start listening for the event that has do be received which indicates the job is done, in case of bridge, I enqueue the CHANNEL_HANGUP_COMPLETE and resume my app as soon as I receive it.
Moe
On Wed, Mar 23, 2011 at 1:41 PM, Dmitry Sytchev <kbdfck@gmail.com> wrote:
I understand this. I use outbound async full ESL mode, launching socket app from dialplan, because in sync mode I have some problems with bridge app and I need to catch parent channel hangup and server disconnection.
I written wrapper around ESL.pm to implement executeSync which waits for CHANNEL_EXECUTE_COMPLETE while in async mode, works for now. But of course it is not the best way, because of possible error when 'execute' is used before my 'executeSync' by mistake and without proper event handling so that CHANNEL_EXECUTE_COMPLETE from previous app is catched by my wrapper and it returns prematurely. This is why I want to have some tag I can mark execute call to filter its events later... Maybe there is better way?
2011/3/23 Michael Collins <msc@freeswitch.org>
On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy < lakindia89@gmail.com> wrote:
Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
http://wiki.freeswitch.org/wiki/Event_socket
-MC
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Best regards,
Dmitry Sytchev, IT Engineer
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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-- Best regards, Dmitry Sytchev, IT Engineer
I have hash table which keeps track of api & dp applications I have executed to process the events & responses I get from FS, based on that I control the flow of execution in my application. For instance for the 'read' application my server returns the result variable as soon as It receives CHANNEL_EXECUTE_COMPLETE with the 'application: read' in it's content. The fired events are very self explanatory it has all the info you need to control the execution flow. If you watch for the 'application' in the content of CHANNEL_EXECUTE_COMPLETE and you keep track of what applications you have executed so far you can map them very easily. Moe On Mar 24, 2011, at 11:11 AM, Dmitry Sytchev wrote:
I don't get any irrelevant channel events, it's my events or my child channel events. I want to distinguish events from previously launched execute() commands in my event loop, like job id in bgapi. These events can be from my own original channel as well, so uuid filter doesn't help me.
2011/3/24 Moe Navid <manavid@gmail.com> I use outbound socket for bridging, I also do my accounting from there too, As soon as I get the CHANNEL_ANSWER event with the direction:outbound (in content) I defer a new process and create a timer which does 6 seconds billing increments.
The trick for not receiving events irrelevant to my session was issuing following at the beginning of my session:
filter unique-id <uuid>\n\n filter channel-call-uuid <uuid>\n\n
I wrote my server in Ruby, I'm using EventMachine for TCP handling and Ruby Fibers to write my apps synchronous fashion while talking to FreeSWITCH in async mode. Whenever I need to simulate the blocking mode and pause the execution at some point (with Fibers) I just start listening for the event that has do be received which indicates the job is done, in case of bridge, I enqueue the CHANNEL_HANGUP_COMPLETE and resume my app as soon as I receive it.
Moe
On Wed, Mar 23, 2011 at 1:41 PM, Dmitry Sytchev <kbdfck@gmail.com> wrote: I understand this. I use outbound async full ESL mode, launching socket app from dialplan, because in sync mode I have some problems with bridge app and I need to catch parent channel hangup and server disconnection.
I written wrapper around ESL.pm to implement executeSync which waits for CHANNEL_EXECUTE_COMPLETE while in async mode, works for now. But of course it is not the best way, because of possible error when 'execute' is used before my 'executeSync' by mistake and without proper event handling so that CHANNEL_EXECUTE_COMPLETE from previous app is catched by my wrapper and it returns prematurely. This is why I want to have some tag I can mark execute call to filter its events later... Maybe there is better way?
2011/3/23 Michael Collins <msc@freeswitch.org>
On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy <lakindia89@gmail.com> wrote: Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
http://wiki.freeswitch.org/wiki/Event_socket
-MC
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Best regards,
Dmitry Sytchev, IT Engineer
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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-- Best regards,
Dmitry Sytchev, IT Engineer _______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
Application name can be the same for multiple execute() calls, so we need to hash by name+params+uuid+something else, but single user- or autogenerated tag field in request/response will be enough to track application execution :) Anyway, thanks to all for your ideas! I have similiar working solution, but I thought if it can be done in some better way. 2011/3/24 Mohammad Amin <manavid@gmail.com>
I have hash table which keeps track of api & dp applications I have executed to process the events & responses I get from FS, based on that I control the flow of execution in my application.
For instance for the 'read' application my server returns the result variable as soon as It receives CHANNEL_EXECUTE_COMPLETE with the 'application: read' in it's content.
The fired events are very self explanatory it has all the info you need to control the execution flow. If you watch for the 'application' in the content of CHANNEL_EXECUTE_COMPLETE and you keep track of what applications you have executed so far you can map them very easily.
Moe
On Mar 24, 2011, at 11:11 AM, Dmitry Sytchev wrote:
I don't get any irrelevant channel events, it's my events or my child channel events. I want to distinguish events from previously launched execute() commands in my event loop, like job id in bgapi. These events can be from my own original channel as well, so uuid filter doesn't help me.
2011/3/24 Moe Navid <manavid@gmail.com>
I use outbound socket for bridging, I also do my accounting from there too, As soon as I get the CHANNEL_ANSWER event with the direction:outbound (in content) I defer a new process and create a timer which does 6 seconds billing increments.
The trick for not receiving events irrelevant to my session was issuing following at the beginning of my session:
filter unique-id <uuid>\n\n filter channel-call-uuid <uuid>\n\n
I wrote my server in Ruby, I'm using EventMachine for TCP handling and Ruby Fibers to write my apps synchronous fashion while talking to FreeSWITCH in async mode. Whenever I need to simulate the blocking mode and pause the execution at some point (with Fibers) I just start listening for the event that has do be received which indicates the job is done, in case of bridge, I enqueue the CHANNEL_HANGUP_COMPLETE and resume my app as soon as I receive it.
Moe
On Wed, Mar 23, 2011 at 1:41 PM, Dmitry Sytchev <kbdfck@gmail.com> wrote:
I understand this. I use outbound async full ESL mode, launching socket app from dialplan, because in sync mode I have some problems with bridge app and I need to catch parent channel hangup and server disconnection.
I written wrapper around ESL.pm to implement executeSync which waits for CHANNEL_EXECUTE_COMPLETE while in async mode, works for now. But of course it is not the best way, because of possible error when 'execute' is used before my 'executeSync' by mistake and without proper event handling so that CHANNEL_EXECUTE_COMPLETE from previous app is catched by my wrapper and it returns prematurely. This is why I want to have some tag I can mark execute call to filter its events later... Maybe there is better way?
2011/3/23 Michael Collins <msc@freeswitch.org>
On Wed, Mar 23, 2011 at 6:48 AM, lakshmanan ganapathy < lakindia89@gmail.com> wrote:
Hi, Eventlock is used to say "Whether to queue the commands or not".
Assume I'm giving playback and bridge command via outbound socket to freeswitch.
If eventlock is "true" then, first "playback will be executed" and then only the bridge will be executed.
If eventlock is "false", then order of execution is not guaranteed.
I'm also using Outbound event socket. I'll run it in async mode. After each execute() statement, if I need the output for that event, I will wait for the event and then only I'll proceed. If I don't need event, ( playback ), I just do the other operations.
This works well for me.
Be sure that you are using the terms "inbound" and "outbound" event socket correctly. It's inbound or outbound from the perspective of FreeSWITCH, not from the perspective of your script. An easy rule of thumb is this: if you use the 'socket' application in your dialplan then you are using "outbound event socket" because FS has to make an outbound connection to your script.
http://wiki.freeswitch.org/wiki/Event_socket
-MC
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE: http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Best regards,
Dmitry Sytchev, IT Engineer
_______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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-- Best regards,
Dmitry Sytchev, IT Engineer _______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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-- Best regards, Dmitry Sytchev, IT Engineer
participants (5)
-
Dmitry Sytchev
-
lakshmanan ganapathy
-
Michael Collins
-
Moe Navid
-
Mohammad Amin