Separated database logic from mod_muc into backend modules #1758

Separated database logic from mod_muc into backend modules

Add load_permanent_rooms_at_startup option

New result format for some mod_muc functions

Document mod_muc.backend option

Remove mnesia migrations from mod_muc

Replace catch with try..catch

Simplify mod_muc Mnesia code

Subtruct unset_nick from set_nick function

Do not allow to use a nick if DB returns an error

Add MUC registration tests

Test registration over S2S

Move generic s2s code into s2s_helper

Use s2s_helper in muc_SUITE

Disable fed1 cover for MUC-over-S2S tests

Increase timeout for hibernation tests

Add muc_SUITE:can_found_in_db_when_stopped testcase/1

Replace issue= with event= (we've decided to use event= everywhere!)

Check that Nick is not empty in mod_muc:set_nick

Return ok | {error,_} from store_room/4

Return ok | {error,_} from forget_room callback

Do not create room if we have any backend issues

Return {ok, Rooms}|{error,_} from mod_muc_db:get_rooms/1

Fix muc_SUITE to use updated mod_muc API

.travis.yml

@@ -10,6 +10,10 @@ addons:
         - slapd
         - ldap-utils
         - golang # used for google drive test results upload
+    hosts:
+        # travis tries to resolve muc.localhost and fails
+        # used in MUC + s2s tests combination
+        - muc.localhost
 before_install:
         - tools/configure $REL_CONFIG
 install:

doc/modules/mod_muc.md

@@ -8,6 +8,7 @@ Also `mod_muc_log` is a logging submodule.
 ### Options
 * `host` (string, default: `"conference.@HOST@"`): Subdomain for MUC service to reside under. 
  `@HOST@` is replaced with each served domain.
+* `backend` (atom, default: `mnesia`): Storage backend. Currently only `mnesia` is supported.
 * `access` (atom, default: `all`): Access Rule to determine who is allowed to use the MUC service.
 * `access_create` (atom, default: `all`): Who is allowed to create rooms.
 * `access_admin` (atom, default: `none`): Who is the administrator in all rooms.
@@ -27,6 +28,7 @@ Also `mod_muc_log` is a logging submodule.
 * `user_presence_shaper` (atom, default: `none`): Shaper for user presences processed by a room (global for the room).
 * `max_user_conferences` (non-negative, default: 10): Specifies the number of rooms that a user can occupy simultaneously.
 * `http_auth_pool` (atom, default: `none`): If an external HTTP service is chosen to check passwords for password-protected rooms, this option specifies the HTTP pool name to use (see [External HTTP Authentication](#external-http-authentication) below).
+* `load_permanent_rooms_at_startup` (boolean, default: false) - Load all rooms at startup (can be unsafe when there are many rooms, that's why disabled).
 * `hibernate_timeout` (timeout, default: `90000`): Timeout (in milliseconds) defining the inactivity period after which the room's process should be hibernated.
 * `hibernated_room_check_interval` (timeout, default: `infinity`): Interval defining how often the hibernated rooms will be checked (a timer is global for a node).
 * `hibernated_room_timeout` (timeout, default: `inifitniy`): A time after which a hibernated room is stopped (deeply hibernated).

include/mod_muc.hrl

@@ -0,0 +1,13 @@
+-record(muc_room, {
+          name_host,
+          opts
+         }).
+
+-record(muc_online_room, {name_host,
+                          pid
+                         }).
+
+-record(muc_registered, {
+          us_host,
+          nick
+         }).