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#!/usr/bin/env python3
#
# 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 ..element import _KeyStrength
# Local imports
from . import Queue, QueueType
# A queue which pulls element artifacts
#
class PullQueue(Queue):
action_name = "Pull"
complete_name = "Pulled"
queue_type = QueueType.FETCH
def process(self, element):
# returns whether an artifact was downloaded or not
return element._pull()
def skip(self, element):
if element._cached(strength=_KeyStrength.STRONG):
return True
elif element._remotely_cached(strength=_KeyStrength.STRONG):
# pull artifact using strong key
return False
elif element._cached():
return True
elif element._remotely_cached():
# pull artifact using weak key
return False
else:
# nothing to pull
return True
def done(self, element, result, returncode):
if returncode != 0:
return False
# return code is 0 even if artifact was unavailable
if element._cached(recalculate=True):
element._get_cache_key_from_artifact(recalculate=True)
# Element._pull() returns True if it downloaded an artifact,
# here we want to appear skipped if we did not download.
return result
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