Source code for ironic.drivers.modules.inspector.hooks.base

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"""Base code for inspection hooks support."""

import abc

from oslo_config import cfg
from oslo_log import log
import stevedore

from ironic.common import exception
from ironic.common.i18n import _

CONF = cfg.CONF
LOG = log.getLogger(__name__)
_HOOKS_MGR = None


[docs] class InspectionHook(metaclass=abc.ABCMeta): # pragma: no cover """Abstract base class for inspection hooks.""" dependencies = [] """An ordered list of hooks that must be enabled before this one. The items here should be entry point names, not classes. """
[docs] def preprocess(self, task, inventory, plugin_data): """Hook to run before the main inspection data processing. This hook is run even before sanity checks. :param task: A TaskManager instance. :param inventory: Hardware inventory information sent by the ramdisk. Must not be modified by the hook. :param plugin_data: Plugin data sent by the ramdisk. May be modified by the hook. :returns: nothing. """
[docs] def __call__(self, task, inventory, plugin_data): """Hook to run to process inspection data (before Ironic node update). This hook is run after node is found and ports are created, just before the node is updated with the data. :param task: A TaskManager instance. :param inventory: Hardware inventory information sent by the ramdisk. Must not be modified by the hook. :param plugin_data: Plugin data sent by the ramdisk. May be modified by the hook. :returns: nothing. """
[docs] def reset(): """Reset cached managers.""" global _HOOKS_MGR _HOOKS_MGR = None
[docs] def missing_entrypoints_callback(names): """Raise RuntimeError with comma-separated list of missing hooks""" error = _('The following hook(s) are missing or failed to load: %s') raise RuntimeError(error % ', '.join(names))
[docs] def inspection_hooks_manager(*args): """Create a Stevedore extension manager for inspection hooks. :param args: arguments to pass to the hooks constructor :returns: a Stevedore NamedExtensionManager """ global _HOOKS_MGR if _HOOKS_MGR is None: enabled_hooks = [x.strip() for x in CONF.inspector.hooks.split(',') if x.strip()] _HOOKS_MGR = stevedore.NamedExtensionManager( 'ironic.inspection.hooks', names=enabled_hooks, invoke_on_load=True, invoke_args=args, on_missing_entrypoints_callback=missing_entrypoints_callback, name_order=True) return _HOOKS_MGR
[docs] def validate_inspection_hooks(): """Validate the enabled inspection hooks. :raises: RuntimeError on missing or failed to load hooks :returns: the list of hooks that passed validation """ conf_hooks = [ext for ext in inspection_hooks_manager()] valid_hooks = [] valid_hook_names = set() errors = [] for hook in conf_hooks: deps = getattr(hook.obj, 'dependencies', ()) missing = [d for d in deps if d not in valid_hook_names] if missing: errors.append('Hook %(hook)s requires these missing hooks to be ' 'enabled before it: %(missing)s' % {'hook': hook.name, 'missing': ', '.join(missing)}) else: valid_hooks.append(hook) valid_hook_names.add(hook.name) if errors: msg = _('Some hooks failed to load due to dependency problems: ' '%(errors)s') % {'errors': ', '.join(errors)} LOG.error(msg) raise exception.HardwareInspectionFailure(error=msg) return valid_hooks