62c1f10e7b
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 |
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