031314b6d8
Scatter-gather utility returns a raised_exception_sentinel for all kinds of exceptions that are caught and often times there maybe situations where we may have to handle the different types of exceptions differently. To facilitate that, it might be more useful to return the Exception object itself instead of the dummy raised_exception_sentinel so that based on the result's exception type we can handle them differently. Related to blueprint handling-down-cell Change-Id: I861b223ee46b0f0a31f646a4b45f8a02410253cf
87 lines
3.4 KiB
Python
87 lines
3.4 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import copy
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from nova.compute import multi_cell_list
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from nova import context
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from nova.db import api as db
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from nova import exception
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from nova import objects
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from nova.objects import base
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class MigrationSortContext(multi_cell_list.RecordSortContext):
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def __init__(self, sort_keys, sort_dirs):
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if not sort_keys:
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sort_keys = ['created_at', 'id']
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sort_dirs = ['desc', 'desc']
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if 'uuid' not in sort_keys:
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# Add uuid into the list of sort_keys. Since we're striping
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# across cell databases here, many sort_keys arrangements will
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# yield nothing unique across all the databases to give us a stable
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# ordering, which can mess up expected client pagination behavior.
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# So, throw uuid into the sort_keys at the end if it's not already
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# there to keep us repeatable.
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sort_keys = copy.copy(sort_keys) + ['uuid']
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sort_dirs = copy.copy(sort_dirs) + ['asc']
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super(MigrationSortContext, self).__init__(sort_keys, sort_dirs)
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class MigrationLister(multi_cell_list.CrossCellLister):
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def __init__(self, sort_keys, sort_dirs):
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super(MigrationLister, self).__init__(
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MigrationSortContext(sort_keys, sort_dirs))
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@property
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def marker_identifier(self):
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return 'uuid'
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def get_marker_record(self, ctx, marker):
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"""Get the marker migration from its cell.
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This returns the marker migration from the cell in which it lives
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"""
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results = context.scatter_gather_skip_cell0(
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ctx, db.migration_get_by_uuid, marker)
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db_migration = None
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for result_cell_uuid, result in results.items():
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if not context.is_cell_failure_sentinel(result):
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db_migration = result
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cell_uuid = result_cell_uuid
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break
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if not db_migration:
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raise exception.MarkerNotFound(marker=marker)
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return cell_uuid, db_migration
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def get_marker_by_values(self, ctx, values):
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return db.migration_get_by_sort_filters(ctx,
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self.sort_ctx.sort_keys,
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self.sort_ctx.sort_dirs,
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values)
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def get_by_filters(self, ctx, filters, limit, marker, **kwargs):
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return db.migration_get_all_by_filters(
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ctx, filters, limit=limit, marker=marker,
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sort_keys=self.sort_ctx.sort_keys,
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sort_dirs=self.sort_ctx.sort_dirs)
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def get_migration_objects_sorted(ctx, filters, limit, marker,
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sort_keys, sort_dirs):
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mig_generator = MigrationLister(sort_keys, sort_dirs).get_records_sorted(
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ctx, filters, limit, marker)
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return base.obj_make_list(ctx, objects.MigrationList(), objects.Migration,
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mig_generator)
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