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HTTP: Stop accepting requests on final system shutdown.

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There are three CLI commands to stop and restart Asterisk each.

1) core stop/restart now - Hangup all calls and stop or restart Asterisk.
New channels are prevented while the shutdown request is pending.

2) core stop/restart gracefully - Stop or restart Asterisk when there are
no calls remaining in the system.  New channels are prevented while the
shutdown request is pending.

3) core stop/restart when convenient - Stop or restart Asterisk when there
are no calls in the system.  New calls are not prevented while the
shutdown request is pending.

ARI has made stopping/restarting Asterisk more problematic.  While a
shutdown request is pending it is desirable to continue to process ARI
HTTP requests for current calls.  To handle the current calls while a
shutdown request is pending, a new committed to shutdown phase is needed
so ARI applications can deal with the calls until the system is fully
committed to shutdown.

* Added a new shutdown committed phase so ARI applications can deal with
calls until the final committed to shutdown phase is reached.

* Made refuse new HTTP requests when the system has reached the final
system shutdown phase.  Starting anything while the system is actively
releasing resources and unloading modules is not a good thing.

* Split the bridging framework shutdown to not cleanup the global bridging
containers when shutting down in a hurry.  This is similar to how other
modules prevent crashes on rapid system shutdown.

* Moved ast_begin_shutdown(), ast_cancel_shutdown(), and
ast_shutting_down().  You should not have to include channel.h just to
access these system functions.

ASTERISK-24752 #close
Reported by: Matthew Jordan

Review: https://reviewboard.asterisk.org/r/4399/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@431692 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2015-02-11 17:28:13 +00:00
parent 29f3ff0b61
commit feddab7944
10 changed files with 214 additions and 70 deletions
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36
include/asterisk.h
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@@ -111,6 +111,42 @@ int ast_register_cleanup(void (*func)(void));
*/
void ast_unregister_atexit(void (*func)(void));
/*!
* \brief Cancel an existing shutdown and return to normal operation.
*
* \note Shutdown can be cancelled while the server is waiting for
* any existing channels to be destroyed before shutdown becomes
* irreversible.
*
* \return non-zero if shutdown cancelled.
*/
int ast_cancel_shutdown(void);
/*!
* \details
* The server is preventing new channel creation in preparation for
* shutdown and may actively be releasing resources. The shutdown
* process may be canceled by ast_cancel_shutdown() if it is not too
* late.
*
* \note The preparation to shutdown phase can be quite lengthy
* if we are gracefully shutting down. How long existing calls will
* last is not up to us.
*
* \return non-zero if the server is preparing to or actively shutting down.
*/
int ast_shutting_down(void);
/*!
* \return non-zero if the server is actively shutting down.
* \since 13.3.0
*
* \details
* The server is releasing resources and unloading modules.
* It won't be long now.
*/
int ast_shutdown_final(void);
#if !defined(LOW_MEMORY)
/*!
* \brief Register the version of a source code file with the core.