[Asterisk-code-review] res/ari: Register Stasis application on WebSocket attempt (asterisk[13])

[Matt Jordan]

Matt Jordan has uploaded a new patch set (#2).

Change subject: res/ari: Register Stasis application on WebSocket attempt
......................................................................

res/ari: Register Stasis application on WebSocket attempt

Prior to this patch, when a WebSocket connection is made, ARI would not
be informed of the connection until after the WebSocket layer had
accepted the connection. This created a brief race condition where the
ARI client would be notified that it was connected, a channel would be
sent into the Stasis dialplan application, but ARI would not yet have
registered the Stasis application presented in the HTTP request that
established the WebSocket.

This patch resolves this issue by doing the following:
 * When a WebSocket attempt is made, a callback is made into the ARI
   application layer, which verifies and registers the apps presented in
   the HTTP request. Because we do not yet have a WebSocket, we cannot
   have an event session for the corresponding applications. Some
   defensive checks were thus added to make the application objects
   tolerant to a NULL event session.
 * When a WebSocket connection is made, the registered application is
   updated with the newly created event session that wraps the WebSocket
   connection.

ASTERISK-24988 #close
Reported by: Joshua Colp

Change-Id: Ia5dc60dc2b6bee76cd5aff0f69dd53b36e83f636
---
M res/ari/resource_events.c
M res/ari/resource_events.h
M res/res_ari_events.c
M res/stasis/app.c
M rest-api-templates/ari_resource.h.mustache
M rest-api-templates/res_ari_resource.c.mustache
6 files changed, 231 insertions(+), 25 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/86/486/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia5dc60dc2b6bee76cd5aff0f69dd53b36e83f636
Gerrit-PatchSet: 2
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Matt Jordan <mjordan at digium.com>