HTTP: Stop accepting requests on final system shutdown.

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/
........

Merged revisions 431692 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431694 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 8 insertions, 11 deletions

diff --git a/include/asterisk/channel.h b/include/asterisk/channel.h
index 595c91da2..b6755e256 100644
--- a/include/asterisk/channel.h
+++ b/include/asterisk/channel.h
@@ -1511,6 +1511,14 @@ const struct ast_channel_tech *ast_get_channel_tech(const char *name);
 void ast_hangup(struct ast_channel *chan);
 
 /*!
+ * \brief Soft hangup all active channels.
+ * \since 13.3.0
+ *
+ * \return Nothing
+ */
+void ast_softhangup_all(void);
+
+/*!
  * \brief Softly hangup up a channel
  *
  * \param chan channel to be soft-hung-up
@@ -2203,23 +2211,12 @@ int ast_channel_defer_dtmf(struct ast_channel *chan);
 /*! Undo defer.  ast_read will return any DTMF characters that were queued */
 void ast_channel_undefer_dtmf(struct ast_channel *chan);
 
-/*! Initiate system shutdown -- prevents new channels from being allocated.
- * \param hangup  If "hangup" is non-zero, all existing channels will receive soft
- *  hangups */
-void ast_begin_shutdown(int hangup);
-
-/*! Cancels an existing shutdown and returns to normal operation */
-void ast_cancel_shutdown(void);
-
 /*! \return number of channels available for lookup */
 int ast_active_channels(void);
 
 /*! \return the number of channels not yet destroyed */
 int ast_undestroyed_channels(void);
 
-/*! \return non-zero if Asterisk is being shut down */
-int ast_shutting_down(void);
-
 /*! Activate a given generator */
 int ast_activate_generator(struct ast_channel *chan, struct ast_generator *gen, void *params);