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#
# Copyright (C) 2016 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
# Jürg Billeter <juerg.billeter@codethink.co.uk>
# BuildStream toplevel imports
from ... import Consistency
# Local imports
from . import Queue, QueueStatus
from ..resources import ResourceType
from ..jobs import JobStatus
# A queue which fetches element sources
#
class FetchQueue(Queue):
action_name = "Fetch"
complete_name = "Fetched"
resources = [ResourceType.DOWNLOAD]
def __init__(self, scheduler, skip_cached=False, fetch_original=False):
super().__init__(scheduler)
self._skip_cached = skip_cached
self._fetch_original = fetch_original
def process(self, element):
element._fetch(fetch_original=self._fetch_original)
def status(self, element):
if not element._is_required():
# Artifact is not currently required but it may be requested later.
# Keep it in the queue.
return QueueStatus.WAIT
# Optionally skip elements that are already in the artifact cache
if self._skip_cached:
if not element._can_query_cache():
return QueueStatus.WAIT
if element._cached():
return QueueStatus.SKIP
# This will automatically skip elements which
# have no sources.
if not element._should_fetch(self._fetch_original):
return QueueStatus.SKIP
return QueueStatus.READY
def done(self, _, element, result, status):
if status == JobStatus.FAIL:
return
element._fetch_done()
# Successful fetch, we must be CACHED now
assert element._get_consistency() == Consistency.CACHED
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