Package sunlabs.brazil.asterisk

Class AsteriskAGIHandler

java.lang.Object
sunlabs.brazil.template.Template
sunlabs.brazil.asterisk.AsteriskAGIHandler
All Implemented Interfaces:
Runnable, Handler, TemplateInterface
public class AsteriskAGIHandler extends Template implements Handler, Runnable
FAGI (fast AGI) handler and template for Asterisk. This handler/template starts a server listening on the * FAGI port. Anytime it gets an agi request from * it creates a dummy request object (sort of like TestRequest) to simulate an http request, reads a file implied by the request agi:... string, and processes the file through the template runner. The invalid input: '<'agi...> template can be used to interact with * via standard agi commands, and the web via the SetTemplate and namespaces. The template output is discarded (if debug is enables, it is printed on the server console); everything is done via side effect. This allows us to interact with the ordinary template variables and namespaces. I'm still not sure how to deal with sessions, so we'll use a different one for each uniqueid in the agi request. (This is a bad idea unless we delete completed sessions "by hand").

(Implementation notes)
This class implements 4 different threads: - handler/init: to get the config params and start the listening socket - The thread that listens and accepts connections from * - the threads that handle the incoming agi requests - the threads that do the template invalid input: '<'agi...> stuff

  • Constructor Details

    • AsteriskAGIHandler

      public AsteriskAGIHandler()

  • Method Details

    • init

      public boolean init(Server server, String prefix)
      Start a Listening socket thread, and wait for AGI connections.
      Specified by:
      init in interface Handler
      Parameters:
      server - The HTTP server that created this Handler. Typical Handlers will use Server.props to obtain run-time configuration information.
      prefix - The handlers name. The string this Handler may prepend to all of the keys that it uses to extract configuration information from Server.props. This is set (by the Server and ChainHandler) to help avoid configuration parameter namespace collisions.
      Returns:
      true if this Handler initialized successfully, false otherwise. If false is returned, this Handler should not be used.

    • respond

      public boolean respond(Request request) throws IOException
      We don't handle any "normal" requests.
      Specified by:
      respond in interface Handler
      Parameters:
      request - The Request object that represents the HTTP request.
      Returns:
      always false
      Throws:
      IOException - if there was an I/O error while sending the response to the client. Typically, in that case, the Server will (try to) send an error message to the client and then close the client's connection.

      The IOException should not be used to silently ignore problems such as being unable to access some server-side resource (for example getting a FileNotFoundException due to not being able to open a file). In that case, the Handler's duty is to turn that IOException into a HTTP response indicating, in this case, that a file could not be found.

    • init

      public boolean init(RewriteContext hr)
      Open the socket's streams at top of page. This will be used by the <agi> calls.
      Specified by:
      init in interface TemplateInterface
      Overrides:
      init in class Template

    • done

      public boolean done(RewriteContext hr)
      Close the socket connection.
      Specified by:
      done in interface TemplateInterface
      Overrides:
      done in class Template

    • tag_agi

      public void tag_agi(RewriteContext hr)
      Provide the 'agi' tag. <agi command="agi command"> The result is placed in "agi_result". NOTE: the thread running this instance doesn't set any of the instance variables. We get everything from "hr".

    • run

      public void run()
      Either start a listening socket or handle an AGI request.
      Specified by:
      run in interface Runnable