Responding Liverpie

[Adeel Ansari]

I am sending the response to liverpie as below, from my web app.

===
        response.setStatus(200);
        response.getWriter().println("event plain ALL");

===

And always find it crashed with this message.

===
** Exiting **
** Exiting... **
./lib/liverpie_server.rb:95:in `send': undefined method `+' for nil:NilClass (NoMethodError)
        from ./lib/liverpie_server.rb:65:in `receive_data'
        from /usr/lib64/ruby/gems/1.8/gems/eventmachine-0.12.0/lib/eventmachine.rb:224:in `run_machine'
        from /usr/lib64/ruby/gems/1.8/gems/eventmachine-0.12.0/lib/eventmachine.rb:224:in `run'
        from ./bin/liverpie:20
        from ./lib/script_base.rb:87:in `start'
        from ./lib/script_base.rb:52:in `initialize'
        from ./bin/liverpie:19:in `new'
        from ./bin/liverpie:19

===

Am I doing something wrong? Is there any other particular format to send? Oh forget to tell you, I am using Java.

Thanks.

--
Best,
Adeel Ansari

http://www.linkedin.com/in/adeelansari

[Adeel Ansari]

Should I send it as a request attribute?
Thanks.

[Alex Deva]

Hello Adeel,

As said in the documentation, your webapp must return a plaintext YAML, not just a FreeSWITCH command like you're doing.

The YAML must contain the message (actual FS command), and a hook for when the webapp will be next called again. That hook is comprised of an expected_key and an expected_value.

Let me refer to the example in the documentation:

---

msg: |-

  SendMsg

  call-command: execute

  execute-app-name: playback

  execute-app-arg: ivr/8000/ivr-welcome_to_freeswitch.wav

  event-lock:true

expected_value: CHANNEL_EXECUTE_COMPLETE

expected_key: event_name

Here we have a YAML with 3 keys: 

a. msg (sending the command 'execute playback' with arguments to FS);

b. expected_value

c. expected_key

Liverpie will send whatever is in 'msg' towards FreeSWITCH, then wait until in the communication with FS it encounters the variable 'event_name' as having the value 'CHANNEL_EXECUTE_COMPLETE'. When that happens, it calls your webapp again, and so on.

Please use a Java library of your choice to create a well-formed YAML, or I suppose you could create it "by hand". That is what your response should contain.

Good luck and thank you for your feedback,

  Alex

[Adeel Ansari]

Thanks you very much, Alex, for an adequate explanation. Yes, I am doing it by hand, until the use of a library becomes reasonable to me.

[Adeel Ansari]

One more thing, Alex. Its not calling my webapp with any paramter, not even with unique_id.

[Adeel Ansari]

Thanks Alex for all the help. Its working like charm now. There was a problem with my YAML form.

[Alex Deva]

Thank you!

Perhaps you'll consider contributing with an example webapp in Java, for the "examples" sections?

[Adeel Ansari]

Sure thing. I will send one soon.

[Alex Deva]

Hello,

Liverpie 0.2 has just been released. Check it out at www.liverpie.com

There's a doc/CHANGELOG now.

This version's changes:

25 sept 2008 - version 0.2
* fixed a bug that prevented web servers that don't send cookies
with each request (like Tomcat) to work with Liverpie
* fixed a bug where Liverpie would crash if the webapp became
unavailable. Now it just carelessly logs it.

A Java example has also been added to the web site, thanks to Adeel
Ansari.

Alex

[Adeel Ansari]

Thanks, Alex for the update and your efforts.