Relax service module check on service providers

service_provider is a 'special' configuration. It is a MultiStr
option that used to be in neutron.conf, but moved into its own *-aas
config files after the service split. We allow for the definition to
be available 'anywhere': either in neutron.conf or in the *-aas
service's config file.

The list of 'service_provider' can include drivers from within the *-aas
tree, or from elsewhere, and can apply to different service types. Due to
the polymorphic nature of this variable it is very tricky to identify only
the drivers that pertain a specific service module: the service module
may as well implement more than one service type and may have support
from drivers out of tree.

For this reason it is best to relax this check and rely on query filters
when the ServiceManager.get_service_providers() is invoked. Furthermore,
without this fix there was a situation where the value returned by
'service_providers' may be differ depending on how the configuration is
passed on the CLI, and this inconsistency may only cause headaches.

Closes-bug: #1492069

Change-Id: I4db4ce0b287c984d86181227edf769531ecb7bb8

diff --git a/neutron/services/provider_configuration.py b/neutron/services/provider_configuration.py
index fb19552d07f037f8978bf32126ecde6c2eb3f3e5..9f8981be8236dbea9d2ef537732f6dc0f68f6871 100644 (file)
--- a/neutron/services/provider_configuration.py
+++ b/neutron/services/provider_configuration.py
@@ -82,22 +82,18 @@ class NeutronModule(object):
     def service_providers(self):
         """Return the service providers for the extension module."""
         providers = []
-        # Attempt to read the config from cfg.CONF; this is possible
-        # when passing --config-dir. Since the multiStr config option
-        # gets merged, extract only the providers pertinent to this
-        # service module.
+        # Attempt to read the config from cfg.CONF first; when passing
+        # --config-dir, the option is merged from all the definitions
+        # made across all the imported config files
         try:
-            providers = [
-                sp for sp in cfg.CONF.service_providers.service_provider
-                if self.module_name in sp
-            ]
+            providers = cfg.CONF.service_providers.service_provider
         except cfg.NoSuchOptError:
             pass
 
-        # Alternatively, if the option is not avaialable, load the
-        # config option using the module's built-in ini parser.
-        # this may be necessary, if modules are loaded on the fly
-        # (DevStack may be an example)
+        # Alternatively, if the option is not available, try to load
+        # it from the provider module's config file; this may be
+        # necessary, if modules are loaded on the fly (DevStack may
+        # be an example)
         if not providers:
             providers = self.ini().service_providers.service_provider