Move plugin stuff to clientmanager

The OSC plugins work by adding an object as an attribute to a
ClientManager instance.  The initialization and management of
thos plugins belongs in clientmanager.py.

At this point the only part not moved is the API version dict
initialization bcause the timing and connection to the
CommandManager initialization.  It gets refactored anyway when
API discovery becomes operational.

Change-Id: If9cb9a0c45a3a577082a5cdbb793769211f20ebb

openstackclient/common/clientmanager.py

@@ -29,6 +29,8 @@ from openstackclient.identity import client as identity_client
 
 LOG = logging.getLogger(__name__)
 
+PLUGIN_MODULES = []
+
 
 class ClientCache(object):
     """Descriptor class for caching created client handles."""
@@ -123,11 +125,13 @@ class ClientManager(object):
         return endpoint
 
 
-def get_extension_modules(group):
-    """Add extension clients"""
+# Plugin Support
+
+def get_plugin_modules(group):
+    """Find plugin entry points"""
     mod_list = []
     for ep in pkg_resources.iter_entry_points(group):
-        LOG.debug('found extension %r', ep.name)
+        LOG.debug('Found plugin %r', ep.name)
 
         __import__(ep.module_name)
         module = sys.modules[ep.module_name]
@@ -136,6 +140,7 @@ def get_extension_modules(group):
         if init_func:
             init_func('x')
 
+        # Add the plugin to the ClientManager
         setattr(
             ClientManager,
             module.API_NAME,
@@ -144,3 +149,22 @@ def get_extension_modules(group):
             ),
         )
     return mod_list
+
+
+def build_plugin_option_parser(parser):
+    """Add plugin options to the parser"""
+
+    # Loop through extensions to get parser additions
+    for mod in PLUGIN_MODULES:
+        parser = mod.build_option_parser(parser)
+    return parser
+
+
+# Get list of base plugin modules
+PLUGIN_MODULES = get_plugin_modules(
+    'openstack.cli.base',
+)
+# Append list of external plugin modules
+PLUGIN_MODULES.extend(get_plugin_modules(
+    'openstack.cli.extension',
+))

openstackclient/shell.py

@@ -68,19 +68,6 @@ class OpenStackShell(app.App):
         # Assume TLS host certificate verification is enabled
         self.verify = True
 
-        # Get list of base modules
-        self.ext_modules = clientmanager.get_extension_modules(
-            'openstack.cli.base',
-        )
-        # Append list of extension modules
-        self.ext_modules.extend(clientmanager.get_extension_modules(
-            'openstack.cli.extension',
-        ))
-
-        # Loop through extensions to get parser additions
-        for mod in self.ext_modules:
-            self.parser = mod.build_option_parser(self.parser)
-
         # NOTE(dtroyer): This hack changes the help action that Cliff
         #                automatically adds to the parser so we can defer
         #                its execution until after the api-versioned commands
@@ -170,6 +157,7 @@ class OpenStackShell(app.App):
         parser = super(OpenStackShell, self).build_option_parser(
             description,
             version)
+
         # service token auth argument
         parser.add_argument(
             '--os-url',
@@ -214,7 +202,7 @@ class OpenStackShell(app.App):
             help="Print API call timing info",
         )
 
-        return parser
+        return clientmanager.build_plugin_option_parser(parser)
 
     def authenticate_user(self):
         """Verify the required authentication credentials are present"""
@@ -332,7 +320,7 @@ class OpenStackShell(app.App):
         self.default_domain = self.options.os_default_domain
 
         # Loop through extensions to get API versions
-        for mod in self.ext_modules:
+        for mod in clientmanager.PLUGIN_MODULES:
             version_opt = getattr(self.options, mod.API_VERSION_OPTION, None)
             if version_opt:
                 api = mod.API_NAME