Adds a PluginLoader which loads classes defined as stevedore plugins at
io.murano.extension namespace and registers them as MuranoPL classes in
class loader.
Modifies the ClientManager class to make the _get_client method public,
so other code may use it to add custom clients. This is useful for
plugins which may define their own clients.
Modifies the configuration settings adding 'enabled_plugins' parameter to
control which of the installed plugins are active.
Adds an example plugin which encapsulates Glance interaction logic to:
* List all available glance images
* Get Image by ID
* Get Image by Name
* Output image info with murano-related metadata
Adds a demo application which demonstrates the usage of plugin. The app
consist of the following components:
* An 'ImageValidatorMixin' class which inherits generic instance
class (io.murano.resources.Instance) and adds a method capable to
validate Instance's image for having appropriate murano metadata
type. This class may be used as a mixin when added to inheritance
hierarchy of concrete instance classes.
* A concrete class called DemoInstance which inherits from
io.murano.resources.LinuxMuranoInstance and ImageValidatorMixin
to add the image validation logic to standard Murano-enabled
Linux-based instance.
* An application which deploys a single VM using the DemoInstance
class if the tag on user-supplied image matches the user-supplied
constant.
The ImageValidatorMixin demonstrates the instantiation of
plugin-provided class and its usage, as well as handling of exception
which may be thrown if the plugin is not installed in the environment.
Change-Id: I978339d87033bbe38dad4c2102612d8f3a1eb3c3
Implements-blueprint: plugable-classes
62c1f10e7b