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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 = "Sources Fetched"
resources = [ResourceType.DOWNLOAD]
def __init__(self, scheduler, skip_cached=False, fetch_original=False):
super().__init__(scheduler)
self._skip_cached = skip_cached
self._should_fetch_original = fetch_original
def get_process_func(self):
if self._should_fetch_original:
return FetchQueue._fetch_original
else:
return FetchQueue._fetch_not_original
def status(self, element):
# Optionally skip elements that are already in the artifact cache
if self._skip_cached:
if not element._can_query_cache():
return QueueStatus.PENDING
if element._cached():
return QueueStatus.SKIP
# This will automatically skip elements which
# have no sources.
if not element._should_fetch(self._should_fetch_original):
return QueueStatus.SKIP
return QueueStatus.READY
def done(self, _, element, result, status):
if status is JobStatus.FAIL:
return
element._fetch_done()
# Successful fetch, we must be CACHED or in the sourcecache
if self._should_fetch_original:
assert element._get_consistency() == Consistency.CACHED
else:
assert element._source_cached()
def register_pending_element(self, element):
# Set a "can_query_cache" callback for an element not yet ready
# to be processed in the fetch queue.
element._set_can_query_cache_callback(self._enqueue_element)
@staticmethod
def _fetch_not_original(element):
element._fetch(fetch_original=False)
@staticmethod
def _fetch_original(element):
element._fetch(fetch_original=True)
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