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
37 lines
1.0 KiB
YAML
37 lines
1.0 KiB
YAML
Namespaces:
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=: io.murano.apps.example.plugin
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res: io.murano.resources
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Name: ImageValidatorMixin
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Extends:
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- res:Instance
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Properties:
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requiredType:
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Contract: $.string().notNull()
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Workflow:
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validateImage:
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Body:
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- Try:
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- $glance: new('io.murano.extensions.mirantis.example.Glance')
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Catch:
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With: 'murano.dsl.exceptions.NoPackageForClassFound'
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Do:
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Throw: PluginNotFoundException
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Message: 'Plugin for interaction with Glance is not installed'
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- $glanceImage: $glance.getById($.image)
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- If: $glanceImage = null
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Then:
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Throw: ImageNotFoundException
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Message: 'Image with specified Id was not found'
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- If: $glanceImage.meta = null
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Then:
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Throw: InvalidImageException
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Message: 'Image does not contain Murano metadata tag'
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- If: $glanceImage.meta.type != $.requiredType
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Then:
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Throw: InvalidImageException
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Message: 'Image has unappropriate Murano type'
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