148 lines
5.8 KiB
Python
148 lines
5.8 KiB
Python
import logging
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import time
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import features
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from app import app, storage as app_storage, image_replication_queue
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from data.database import CloseForLongOperation
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from data import model
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from workers.queueworker import QueueWorker, WorkerUnhealthyException, JobException
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from util.log import logfile_path
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logger = logging.getLogger(__name__)
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POLL_PERIOD_SECONDS = 10
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RESERVATION_SECONDS = app.config.get('STORAGE_REPLICATION_PROCESSING_SECONDS', 60*20)
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class StorageReplicationWorker(QueueWorker):
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def process_queue_item(self, job_details):
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storage_uuid = job_details['storage_id']
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namespace_id = job_details['namespace_user_id']
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logger.debug('Starting replication of image storage %s under namespace %s', storage_uuid,
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namespace_id)
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try:
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namespace = model.user.get_namespace_user_by_user_id(namespace_id)
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except model.user.InvalidUsernameException:
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logger.exception('Exception when looking up namespace %s for replication of image storage %s',
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namespace_id, storage_uuid)
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return
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self.replicate_storage(namespace, storage_uuid, app_storage)
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def _backoff_check_exists(self, location, path, storage, backoff_check=True):
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for retry in range(0, 4):
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if storage.exists([location], path):
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return True
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if not backoff_check:
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return False
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seconds = pow(2, retry) * 2
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logger.debug('Cannot find path `%s` in location %s (try #%s). Sleeping for %s seconds',
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path, location, retry, seconds)
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time.sleep(seconds)
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return False
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def replicate_storage(self, namespace, storage_uuid, storage, backoff_check=True):
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# Lookup the namespace and its associated regions.
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if not namespace:
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logger.debug('Unknown namespace when trying to replicate storage %s', storage_uuid)
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return
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locations = model.user.get_region_locations(namespace)
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# Lookup the image storage.
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try:
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partial_storage = model.storage.get_storage_by_uuid(storage_uuid)
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except model.InvalidImageException:
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logger.debug('Unknown storage: %s', storage_uuid)
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return
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# Check to see if the image is at all the required locations.
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locations_required = locations | set(storage.default_locations)
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locations_missing = locations_required - set(partial_storage.locations)
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logger.debug('For replication of storage %s under namespace %s: %s required; %s missing',
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storage_uuid, namespace.username, locations_required, locations_missing)
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if not locations_missing:
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logger.debug('No missing locations for storage %s under namespace %s. Required: %s',
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storage_uuid, namespace.username, locations_required)
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return
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# For any missing storage locations, initiate a copy.
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existing_location = list(partial_storage.locations)[0]
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path_to_copy = model.storage.get_layer_path(partial_storage)
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# Lookup and ensure the existing location exists.
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if not self._backoff_check_exists(existing_location, path_to_copy, storage, backoff_check):
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logger.warning('Cannot find image storage %s in existing location %s; stopping replication',
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storage_uuid, existing_location)
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raise JobException()
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# For each missing location, copy over the storage.
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for location in locations_missing:
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logger.debug('Starting copy of storage %s to location %s from %s', partial_storage.uuid,
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location, existing_location)
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# Copy the binary data.
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copied = False
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try:
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with CloseForLongOperation(app.config):
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storage.copy_between(path_to_copy, existing_location, location)
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copied = True
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except IOError:
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logger.exception('Failed to copy path `%s` of image storage %s to location %s',
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path_to_copy, partial_storage.uuid, location)
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raise JobException()
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except:
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logger.exception('Unknown exception when copying path %s of image storage %s to loc %s',
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path_to_copy, partial_storage.uuid, location)
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raise WorkerUnhealthyException()
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if copied:
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# Verify the data was copied to the target storage, to ensure that there are no cases
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# where we write the placement without knowing the data is present.
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if not self._backoff_check_exists(location, path_to_copy, storage, backoff_check):
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logger.warning('Failed to find path `%s` in location `%s` after copy', path_to_copy,
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location)
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raise JobException()
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# Create the storage location record for the storage now that the copy has
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# completed.
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model.storage.add_storage_placement(partial_storage, location)
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logger.debug('Finished copy of image storage %s to location %s from %s',
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partial_storage.uuid, location, existing_location)
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logger.debug('Completed replication of image storage %s to locations %s from %s',
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partial_storage.uuid, locations_missing, existing_location)
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if __name__ == "__main__":
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logging.config.fileConfig(logfile_path(debug=False), disable_existing_loggers=False)
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has_local_storage = False
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if features.STORAGE_REPLICATION:
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for storage_type, _ in app.config.get('DISTRIBUTED_STORAGE_CONFIG', {}).values():
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if storage_type == 'LocalStorage':
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has_local_storage = True
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break
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if not features.STORAGE_REPLICATION or has_local_storage:
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if has_local_storage:
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logger.error("Storage replication can't be used with local storage")
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else:
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logger.debug('Full storage replication disabled; skipping')
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while True:
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time.sleep(10000)
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logger.debug('Starting replication worker')
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worker = StorageReplicationWorker(image_replication_queue,
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poll_period_seconds=POLL_PERIOD_SECONDS,
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reservation_seconds=RESERVATION_SECONDS)
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worker.start()
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