cache: make instance_id = * the default and deprecate it

Auto assigning instance_id's works perfectly fine now when the clean-up issue
has been resolved.

development.ini

@@ -280,12 +280,6 b' issue_prefix = #'
 #issue_server_link_wiki = https://wiki.example.com/{id}
 #issue_prefix_wiki = WIKI-
 
-## instance-id prefix
-## a prefix key for this instance used for cache invalidation when running
-## multiple instances of kallithea, make sure it's globally unique for
-## all running kallithea instances. Leave empty if you don't use it
-instance_id =
-
 ## alternative return HTTP header for failed authentication. Default HTTP
 ## response is 401 HTTPUnauthorized. Currently Mercurial clients have trouble with
 ## handling that. Set this variable to 403 to return HTTPForbidden

docs/setup.rst

@@ -746,11 +746,6 b' Or if using a dispatcher WSGI script wit'
    When running apache as root, please make sure it doesn't run Kallithea as
    root, for examply by adding: ``user=www-data group=www-data`` to the configuration.
 
-.. note::
-   If running Kallithea in multiprocess mode,
-   make sure you set ``instance_id = *`` in the configuration so each process
-   gets it's own cache invalidation key.
-
 Example WSGI dispatch script:
 
 .. code-block:: python

docs/usage/performance.rst

@@ -38,7 +38,6 b' 3. Scale Kallithea horizontally'
     scaled horizontally on one (recommended) or multiple machines. In order
     to scale horizontally you need to do the following:
 
-    - Each instance needs its own .ini file and unique ``instance_id`` set.
     - Each instance's ``data`` storage needs to be configured to be stored on a
       shared disk storage, preferably together with repositories. This ``data``
       dir contains template caches, sessions, whoosh index and is used for

kallithea/bin/template.ini.mako

@@ -278,12 +278,6 b' issue_prefix = #'
 #issue_server_link_wiki = https://wiki.example.com/{id}
 #issue_prefix_wiki = WIKI-
 
-<%text>## instance-id prefix</%text>
-<%text>## a prefix key for this instance used for cache invalidation when running</%text>
-<%text>## multiple instances of kallithea, make sure it's globally unique for</%text>
-<%text>## all running kallithea instances. Leave empty if you don't use it</%text>
-instance_id =
-
 <%text>## alternative return HTTP header for failed authentication. Default HTTP</%text>
 <%text>## response is 401 HTTPUnauthorized. Currently Mercurial clients have trouble with</%text>
 <%text>## handling that. Set this variable to 403 to return HTTPForbidden</%text>

kallithea/config/deployment.ini_tmpl

@@ -274,12 +274,6 b' issue_prefix = #'
 #issue_server_link_wiki = https://wiki.example.com/{id}
 #issue_prefix_wiki = WIKI-
 
-## instance-id prefix
-## a prefix key for this instance used for cache invalidation when running
-## multiple instances of kallithea, make sure it's globally unique for
-## all running kallithea instances. Leave empty if you don't use it
-instance_id =
-
 ## alternative return HTTP header for failed authentication. Default HTTP
 ## response is 401 HTTPUnauthorized. Currently Mercurial clients have trouble with
 ## handling that. Set this variable to 403 to return HTTPForbidden

kallithea/config/environment.py

@@ -118,7 +118,7 b' def load_environment(global_conf, app_co'
     config['base_path'] = repos_path
     set_app_settings(config)
 
-    instance_id = kallithea.CONFIG.get('instance_id')
+    instance_id = kallithea.CONFIG.get('instance_id', '*')
     if instance_id == '*':
         instance_id = '%s-%s' % (platform.uname()[1], os.getpid())
         kallithea.CONFIG['instance_id'] = instance_id

kallithea/tests/test.ini

@@ -280,12 +280,6 b' issue_prefix = #'
 #issue_server_link_wiki = https://wiki.example.com/{id}
 #issue_prefix_wiki = WIKI-
 
-## instance-id prefix
-## a prefix key for this instance used for cache invalidation when running
-## multiple instances of kallithea, make sure it's globally unique for
-## all running kallithea instances. Leave empty if you don't use it
-instance_id =
-
 ## alternative return HTTP header for failed authentication. Default HTTP
 ## response is 401 HTTPUnauthorized. Currently Mercurial clients have trouble with
 ## handling that. Set this variable to 403 to return HTTPForbidden