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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from zuul import model
from zuul.lib.logutil import get_annotated_logger
from zuul.manager.shared import SharedQueuePipelineManager
class DependentPipelineManager(SharedQueuePipelineManager):
"""PipelineManager for handling interrelated Changes.
The DependentPipelineManager puts Changes that share a Pipeline
into a shared :py:class:`~zuul.model.ChangeQueue`. It then processes them
using the Optimistic Branch Prediction logic with Nearest Non-Failing Item
reparenting algorithm for handling errors.
"""
changes_merge = True
type = 'dependent'
def __init__(self, *args, **kwargs):
super(DependentPipelineManager, self).__init__(*args, **kwargs)
def constructChangeQueue(self, queue_name):
p = self.pipeline
return model.ChangeQueue.new(
p.manager.current_context,
pipeline=p,
window=p.window,
window_floor=p.window_floor,
window_increase_type=p.window_increase_type,
window_increase_factor=p.window_increase_factor,
window_decrease_type=p.window_decrease_type,
window_decrease_factor=p.window_decrease_factor,
name=queue_name)
def getNodePriority(self, item):
with self.getChangeQueue(item.change, item.event) as change_queue:
items = change_queue.queue
return items.index(item)
def isChangeReadyToBeEnqueued(self, change, event):
log = get_annotated_logger(self.log, event)
source = change.project.source
if not source.canMerge(change, self.getSubmitAllowNeeds(),
event=event):
log.debug("Change %s can not merge", change)
return False
return True
def getNonMergeableCycleChanges(self, bundle):
"""Return changes in the cycle that do not fulfill
the pipeline's ready criteria."""
changes = []
for item in bundle.items:
source = item.change.project.source
if not source.canMerge(
item.change,
self.getSubmitAllowNeeds(),
event=item.event,
allow_refresh=True,
):
log = get_annotated_logger(self.log, item.event)
log.debug("Change %s can no longer be merged", item.change)
changes.append(item.change)
return changes
def enqueueChangesBehind(self, change, event, quiet, ignore_requirements,
change_queue, history=None,
dependency_graph=None):
log = get_annotated_logger(self.log, event)
history = history if history is not None else []
log.debug("Checking for changes needing %s:" % change)
if not isinstance(change, model.Change):
log.debug(" %s does not support dependencies" % type(change))
return
# for project in change_queue, project.source get changes, then dedup.
projects = [self.pipeline.tenant.getProject(pcn)[1] for pcn, _ in
change_queue.project_branches]
sources = {p.source for p in projects}
needed_by_changes = self.resolveChangeReferences(
change.getNeededByChanges())
log.debug(" Previously known following changes: %s",
needed_by_changes)
seen = set(needed_by_changes)
for source in sources:
log.debug(" Checking source: %s", source)
for c in source.getChangesDependingOn(change,
projects,
self.pipeline.tenant):
if c not in seen:
seen.add(c)
needed_by_changes.append(c)
log.debug(" Updated following changes: %s", needed_by_changes)
to_enqueue = []
change_dependencies = dependency_graph.get(change, [])
for other_change in needed_by_changes:
if other_change in change_dependencies:
# Only consider the change if it is not part of a cycle, as
# cycle changes will otherwise be partially enqueued without
# any error handling
self.log.debug(
" Skipping change %s due to dependency cycle"
)
continue
with self.getChangeQueue(other_change,
event) as other_change_queue:
if other_change_queue != change_queue:
log.debug(" Change %s in project %s can not be "
"enqueued in the target queue %s" %
(other_change, other_change.project,
change_queue))
continue
source = other_change.project.source
if source.canMerge(other_change, self.getSubmitAllowNeeds(),
event=event):
log.debug(" Change %s needs %s and is ready to merge",
other_change, change)
to_enqueue.append(other_change)
if not to_enqueue:
log.debug(" No changes need %s" % change)
for other_change in to_enqueue:
self.addChange(other_change, event, quiet=quiet,
ignore_requirements=ignore_requirements,
change_queue=change_queue, history=history,
dependency_graph=dependency_graph)
def enqueueChangesAhead(self, change, event, quiet, ignore_requirements,
change_queue, history=None, dependency_graph=None,
warnings=None):
log = get_annotated_logger(self.log, event)
history = history if history is not None else []
if hasattr(change, 'number'):
history.append(change)
else:
# Don't enqueue dependencies ahead of a non-change ref.
return True
abort, needed_changes = self.getMissingNeededChanges(
change, change_queue, event,
dependency_graph=dependency_graph,
warnings=warnings)
if abort:
return False
if not needed_changes:
return True
log.debug(" Changes %s must be merged ahead of %s",
needed_changes, change)
for needed_change in needed_changes:
# If the change is already in the history, but the change also has
# a git level dependency, we need to enqueue it before the current
# change.
if (needed_change not in history or
needed_change.cache_key in change.git_needs_changes):
r = self.addChange(needed_change, event, quiet=quiet,
ignore_requirements=ignore_requirements,
change_queue=change_queue, history=history,
dependency_graph=dependency_graph)
if not r:
return False
return True
def getMissingNeededChanges(self, change, change_queue, event,
dependency_graph=None, warnings=None):
log = get_annotated_logger(self.log, event)
# Return true if okay to proceed enqueing this change,
# false if the change should not be enqueued.
log.debug("Checking for changes needed by %s:" % change)
if not isinstance(change, model.Change):
log.debug(" %s does not support dependencies", type(change))
return False, []
if not change.getNeedsChanges(
self.useDependenciesByTopic(change.project)):
log.debug(" No changes needed")
return False, []
changes_needed = []
abort = False
# Ignore supplied change_queue
with self.getChangeQueue(change, event) as change_queue:
for needed_change in self.resolveChangeReferences(
change.getNeedsChanges(
self.useDependenciesByTopic(change.project))):
log.debug(" Change %s needs change %s:" % (
change, needed_change))
if needed_change.is_merged:
log.debug(" Needed change is merged")
continue
if dependency_graph is not None:
log.debug(" Adding change %s to dependency graph for "
"change %s", needed_change, change)
node = dependency_graph.setdefault(change, [])
node.append(needed_change)
with self.getChangeQueue(needed_change,
event) as needed_change_queue:
if needed_change_queue != change_queue:
msg = ("Change %s in project %s does not "
"share a change queue with %s "
"in project %s" %
(needed_change.number,
needed_change.project,
change.number,
change.project))
log.debug(" " + msg)
if warnings is not None:
warnings.append(msg)
changes_needed.append(needed_change)
abort = True
if not needed_change.is_current_patchset:
log.debug(" Needed change is not the current patchset")
changes_needed.append(needed_change)
abort = True
if self.isChangeAlreadyInQueue(needed_change, change_queue):
log.debug(" Needed change is already ahead in the queue")
continue
if needed_change.project.source.canMerge(
needed_change, self.getSubmitAllowNeeds(),
event=event):
log.debug(" Change %s is needed", needed_change)
if needed_change not in changes_needed:
changes_needed.append(needed_change)
continue
# The needed change can't be merged.
log.debug(" Change %s is needed but can not be merged",
needed_change)
changes_needed.append(needed_change)
abort = True
return abort, changes_needed
def getFailingDependentItems(self, item, nnfi):
if not isinstance(item.change, model.Change):
return None
if not item.change.getNeedsChanges(
self.useDependenciesByTopic(item.change.project)):
return None
failing_items = set()
for needed_change in self.resolveChangeReferences(
item.change.getNeedsChanges(
self.useDependenciesByTopic(item.change.project))):
needed_item = self.getItemForChange(needed_change)
if not needed_item:
continue
if needed_item.current_build_set.failing_reasons:
failing_items.add(needed_item)
# Only look at the bundle if the item ahead is the nearest non-failing
# item. This is important in order to correctly reset the bundle items
# in case of a failure.
if item.item_ahead == nnfi and item.isBundleFailing():
failing_items.update(item.bundle.items)
failing_items.remove(item)
if failing_items:
return failing_items
return None
def dequeueItem(self, item):
super(DependentPipelineManager, self).dequeueItem(item)
# If this was a dynamic queue from a speculative change,
# remove the queue (if empty)
if item.queue.dynamic:
if not item.queue.queue:
self.pipeline.removeQueue(item.queue)
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