zuul
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zuul
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zuul/zuul/scheduler.py

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# Copyright 2012-2015 Hewlett-Packard Development Company, L.P.
# Copyright 2013 OpenStack Foundation
# Copyright 2013 Antoine "hashar" Musso
# Copyright 2013 Wikimedia Foundation Inc.
# Copyright 2021-2022 Acme Gating, LLC
#
# 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.
import itertools
import logging
import socket
import sys
import threading
import time
import traceback
import uuid
from contextlib import suppress
from zuul.vendor.contextlib import nullcontext
from collections import defaultdict, OrderedDict
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.interval import IntervalTrigger
from kazoo.exceptions import NotEmptyError
from opentelemetry import trace
from zuul import configloader, exceptions
from zuul.lib import commandsocket
from zuul.lib.ansible import AnsibleManager
from zuul.lib.config import get_default
from zuul.lib.keystorage import KeyStorage
from zuul.lib.logutil import get_annotated_logger
from zuul.lib.monitoring import MonitoringServer
from zuul.lib.queue import NamedQueue
from zuul.lib.times import Times
from zuul.lib.statsd import get_statsd, normalize_statsd_name
from zuul.lib import tracing
import zuul.lib.queue
import zuul.lib.repl
from zuul import nodepool
from zuul.executor.client import ExecutorClient
from zuul.merger.client import MergeClient
from zuul.model import (
Abide,
Build,
BuildCompletedEvent,
BuildPausedEvent,
BuildStartedEvent,
BuildStatusEvent,
Change,
ChangeManagementEvent,
PipelinePostConfigEvent,
SemaphoreReleaseEvent,
PipelineSemaphoreReleaseEvent,
DequeueEvent,
EnqueueEvent,
FilesChangesCompletedEvent,
HoldRequest,
Job,
MergeCompletedEvent,
NodesProvisionedEvent,
PromoteEvent,
ReconfigureEvent,
TenantReconfigureEvent,
UnparsedAbideConfig,
SupercedeEvent,
SystemAttributes,
STATE_FAILED,
)
from zuul.version import get_version_string
from zuul.zk import ZooKeeperClient
from zuul.zk.blob_store import BlobStore
from zuul.zk.cleanup import (
SemaphoreCleanupLock,
BuildRequestCleanupLock,
ConnectionCleanupLock,
GeneralCleanupLock,
MergeRequestCleanupLock,
NodeRequestCleanupLock,
)
from zuul.zk.components import (
BaseComponent, COMPONENT_REGISTRY, SchedulerComponent
)
from zuul.zk.config_cache import SystemConfigCache, UnparsedConfigCache
from zuul.zk.event_queues import (
EventWatcher,
TenantManagementEventQueue,
TenantTriggerEventQueue,
PipelineManagementEventQueue,
PipelineResultEventQueue,
PipelineTriggerEventQueue,
TENANT_ROOT,
)
from zuul.zk.exceptions import LockException
from zuul.zk.layout import LayoutState, LayoutStateStore
from zuul.zk.locks import (
locked,
tenant_read_lock,
tenant_write_lock,
pipeline_lock,
management_queue_lock,
trigger_queue_lock,
)
from zuul.zk.system import ZuulSystem
from zuul.zk.zkobject import ZKContext
from zuul.zk.election import SessionAwareElection
RECONFIG_LOCK_ID = "RECONFIG"
class FullReconfigureCommand(commandsocket.Command):
name = 'full-reconfigure'
help = 'Perform a reconfiguration of all tenants'
class SmartReconfigureCommand(commandsocket.Command):
name = 'smart-reconfigure'
help = 'Perform a reconfiguration of updated tenants'
class TenantArgument(commandsocket.Argument):
name = 'tenant'
help = 'The name of the tenant'
class TenantReconfigureCommand(commandsocket.Command):
name = 'tenant-reconfigure'
help = 'Perform a reconfiguration of a specific tenant'
args = [TenantArgument]
class PipelineArgument(commandsocket.Argument):
name = 'pipeline'
help = 'The name of the pipeline'
class ZKProfileCommand(commandsocket.Command):
name = 'zkprofile'
help = 'Toggle ZK profiling for a pipeline'
args = [TenantArgument, PipelineArgument]
COMMANDS = [
FullReconfigureCommand,
SmartReconfigureCommand,
TenantReconfigureCommand,
ZKProfileCommand,
commandsocket.StopCommand,
commandsocket.ReplCommand,
commandsocket.NoReplCommand,
]
class SchedulerStatsElection(SessionAwareElection):
"""Election for emitting scheduler stats."""
def __init__(self, client):
self.election_root = "/zuul/scheduler/stats-election"
super().__init__(client.client, self.election_root)
class Scheduler(threading.Thread):
"""The engine of Zuul.
The Scheduler is responsible for receiving events and dispatching
them to appropriate components (including pipeline managers,
mergers and executors).
It runs a single threaded main loop which processes events
received one at a time and takes action as appropriate. Other
parts of Zuul may run in their own thread, but synchronization is
performed within the scheduler to reduce or eliminate the need for
locking in most circumstances.
The main daemon will have one instance of the Scheduler class
running which will persist for the life of the process. The
Scheduler instance is supplied to other Zuul components so that
they can submit events or otherwise communicate with other
components.
"""
log = logging.getLogger("zuul.Scheduler")
tracer = trace.get_tracer("zuul")
_stats_interval = 30
_semaphore_cleanup_interval = IntervalTrigger(minutes=60, jitter=60)
_general_cleanup_interval = IntervalTrigger(minutes=60, jitter=60)
_build_request_cleanup_interval = IntervalTrigger(seconds=60, jitter=5)
_merge_request_cleanup_interval = IntervalTrigger(seconds=60, jitter=5)
_connection_cleanup_interval = IntervalTrigger(minutes=5, jitter=10)
_merger_client_class = MergeClient
_executor_client_class = ExecutorClient
def __init__(self, config, connections, app, wait_for_init,
testonly=False):
threading.Thread.__init__(self)
self.daemon = True
self._profile_pipelines = set()
self.wait_for_init = wait_for_init
self.hostname = socket.getfqdn()
self.tracing = tracing.Tracing(config)
self.primed_event = threading.Event()
# Wake up the main run loop
self.wake_event = threading.Event()
# Wake up the update loop
self.layout_update_event = threading.Event()
# Only used by tests in order to quiesce the layout update loop
self.layout_update_lock = threading.Lock()
# Don't change the abide without holding this lock
self.layout_lock = threading.Lock()
# Only used by tests in order to quiesce the main run loop
self.run_handler_lock = threading.Lock()
self.command_map = {
FullReconfigureCommand.name: self.fullReconfigureCommandHandler,
SmartReconfigureCommand.name: self.smartReconfigureCommandHandler,
TenantReconfigureCommand.name:
self.tenantReconfigureCommandHandler,
ZKProfileCommand.name: self.zkProfileCommandHandler,
commandsocket.StopCommand.name: self.stop,
commandsocket.ReplCommand.name: self.startRepl,
commandsocket.NoReplCommand.name: self.stopRepl,
}
self._stopped = False
self._zuul_app = app
self.connections = connections
self.sql = self.connections.getSqlReporter(None)
self.statsd = get_statsd(config)
if self.statsd:
self.statsd_timer = self.statsd.timer
else:
self.statsd_timer = nullcontext
self.times = Times(self.sql, self.statsd)
self.repl = None
self.stats_thread = threading.Thread(target=self.runStatsElection)
self.stats_thread.daemon = True
self.stop_event = threading.Event()
self.apsched = BackgroundScheduler()
# TODO(jeblair): fix this
# Despite triggers being part of the pipeline, there is one trigger set
# per scheduler. The pipeline handles the trigger filters but since
# the events are handled by the scheduler itself it needs to handle
# the loading of the triggers.
# self.triggers['connection_name'] = triggerObject
self.triggers = dict()
self.config = config
self.zk_client = ZooKeeperClient.fromConfig(self.config)
self.zk_client.connect()
self.system = ZuulSystem(self.zk_client)
self.zuul_version = get_version_string()
self.component_info = SchedulerComponent(
self.zk_client, self.hostname, version=self.zuul_version)
self.component_info.register()
self.component_registry = COMPONENT_REGISTRY.create(self.zk_client)
self.system_config_cache = SystemConfigCache(self.zk_client,
self.wake_event.set)
self.unparsed_config_cache = UnparsedConfigCache(self.zk_client)
self.monitoring_server = MonitoringServer(self.config, 'scheduler',
self.component_info)
self.monitoring_server.start()
# TODO (swestphahl): Remove after we've refactored reconfigurations
# to be performed on the tenant level.
self.reconfigure_event_queue = NamedQueue("ReconfigureEventQueue")
self.event_watcher = EventWatcher(
self.zk_client, self.wake_event.set
)
self.management_events = TenantManagementEventQueue.createRegistry(
self.zk_client)
self.pipeline_management_events = (
PipelineManagementEventQueue.createRegistry(
self.zk_client
)
)
self.trigger_events = TenantTriggerEventQueue.createRegistry(
self.zk_client, self.connections
)
self.pipeline_trigger_events = (
PipelineTriggerEventQueue.createRegistry(
self.zk_client, self.connections
)
)
self.pipeline_result_events = PipelineResultEventQueue.createRegistry(
self.zk_client
)
self.general_cleanup_lock = GeneralCleanupLock(self.zk_client)
self.semaphore_cleanup_lock = SemaphoreCleanupLock(self.zk_client)
self.build_request_cleanup_lock = BuildRequestCleanupLock(
self.zk_client)
self.merge_request_cleanup_lock = MergeRequestCleanupLock(
self.zk_client)
self.connection_cleanup_lock = ConnectionCleanupLock(self.zk_client)
self.node_request_cleanup_lock = NodeRequestCleanupLock(self.zk_client)
self.abide = Abide()
self.unparsed_abide = UnparsedAbideConfig()
self.tenant_layout_state = LayoutStateStore(
self.zk_client,
self.layout_update_event.set)
self.local_layout_state = {}
command_socket = get_default(
self.config, 'scheduler', 'command_socket',
'/var/lib/zuul/scheduler.socket')
self.command_socket = commandsocket.CommandSocket(command_socket)
self.last_reconfigured = None
self.globals = SystemAttributes.fromConfig(self.config)
self.ansible_manager = AnsibleManager(
default_version=self.globals.default_ansible_version)
self.stats_election = SchedulerStatsElection(self.zk_client)
if not testonly:
self.executor = self._executor_client_class(self.config, self)
self.merger = self._merger_client_class(self.config, self)
self.nodepool = nodepool.Nodepool(
self.zk_client, self.system.system_id, self.statsd,
scheduler=True)
def start(self):
super(Scheduler, self).start()
self.keystore = KeyStorage(
self.zk_client,
password=self._get_key_store_password())
self._command_running = True
self.log.debug("Starting command processor")
self.command_socket.start()
self.command_thread = threading.Thread(target=self.runCommand,
name='command')
self.command_thread.daemon = True
self.command_thread.start()
self.stats_thread.start()
self.apsched.start()
self.times.start()
# Start a thread to perform initial cleanup, then schedule
# later cleanup tasks.
self.start_cleanup_thread = threading.Thread(
target=self.startCleanup, name='cleanup start')
self.start_cleanup_thread.daemon = True
self.start_cleanup_thread.start()
self.component_info.state = self.component_info.INITIALIZING
# Start a thread to perform background tenant layout updates
self.layout_update_thread = threading.Thread(
target=self.runTenantLayoutUpdates, name='layout updates')
self.layout_update_thread.daemon = True
self.layout_update_thread.start()
def stop(self):
self.log.debug("Stopping scheduler")
self._stopped = True
self.wake_event.set()
# Main thread, connections and layout update may be waiting
# on the primed event
self.primed_event.set()
self.start_cleanup_thread.join()
self.log.debug("Stopping apscheduler")
self.apsched.shutdown()
self.log.debug("Waiting for main thread")
self.join()
self.component_info.state = self.component_info.STOPPED
# Don't set the stop event until after the main thread is
# joined because doing so will terminate the ZKContext.
self.stop_event.set()
self.times.stop()
self.log.debug("Stopping nodepool")
self.nodepool.stop()
self.log.debug("Stopping connections")
# Layout update can reconfigure connections, so make sure
# layout update is stopped first.
self.log.debug("Waiting for layout update thread")
self.layout_update_event.set()
self.layout_update_thread.join()
self.stopConnections()
self.log.debug("Stopping stats thread")
self.stats_election.cancel()
self.stats_thread.join()
self.stopRepl()
self._command_running = False
self.log.debug("Stopping command socket")
self.command_socket.stop()
# If we stop from the command socket we cannot join the command thread.
if threading.current_thread() is not self.command_thread:
self.command_thread.join()
self.log.debug("Stopping timedb thread")
self.times.join()
self.log.debug("Stopping monitoring server")
self.monitoring_server.stop()
self.monitoring_server.join()
self.log.debug("Disconnecting from ZooKeeper")
self.zk_client.disconnect()
self.log.debug("Stopping tracing")
self.tracing.stop()
def runCommand(self):
while self._command_running:
try:
command, args = self.command_socket.get()
if command != '_stop':
self.command_map[command](*args)
except Exception:
self.log.exception("Exception while processing command")
def stopConnections(self):
self.connections.stop()
def runStatsElection(self):
while not self._stopped:
try:
self.log.debug("Running stats election")
self.stats_election.run(self.runStats)
except Exception:
self.log.exception("Exception running election stats:")
time.sleep(1)
def runStats(self):
self.log.debug("Won stats election")
while not self.stop_event.wait(self._stats_interval):
if not self.stats_election.is_still_valid():
self.log.debug("Stats election no longer valid")
return
try:
self._runStats()
except Exception:
self.log.exception("Error in periodic stats:")
def _runStats(self):
if not self.statsd:
return
executor_stats_default = {
"online": 0,
"accepting": 0,
"queued": 0,
"running": 0
}
# Calculate the executor and merger stats
executors_online = 0
executors_accepting = 0
executors_unzoned_online = 0
executors_unzoned_accepting = 0
# zone -> accepting|online
zoned_executor_stats = {}
zoned_executor_stats.setdefault(None, executor_stats_default.copy())
mergers_online = 0
for executor_component in self.component_registry.all("executor"):
if executor_component.allow_unzoned:
if executor_component.state == BaseComponent.RUNNING:
executors_unzoned_online += 1
if executor_component.accepting_work:
executors_unzoned_accepting += 1
if executor_component.zone:
zone_stats = zoned_executor_stats.setdefault(
executor_component.zone,
executor_stats_default.copy())
if executor_component.state == BaseComponent.RUNNING:
zone_stats["online"] += 1
if executor_component.accepting_work:
zone_stats["accepting"] += 1
# An executor with merger capabilities does also count as merger
if executor_component.process_merge_jobs:
mergers_online += 1
# TODO(corvus): Remove for 5.0:
executors_online += 1
if executor_component.accepting_work:
executors_accepting += 1
# Get all builds so we can filter by state and zone
for build_request in self.executor.executor_api.inState():
zone_stats = zoned_executor_stats.setdefault(
build_request.zone,
executor_stats_default.copy())
if build_request.state == build_request.REQUESTED:
zone_stats['queued'] += 1
if build_request.state in (
build_request.RUNNING, build_request.PAUSED):
zone_stats['running'] += 1
# Publish the executor stats
self.statsd.gauge('zuul.executors.unzoned.accepting',
executors_unzoned_accepting)
self.statsd.gauge('zuul.executors.unzoned.online',
executors_unzoned_online)
self.statsd.gauge('zuul.executors.unzoned.jobs_running',
zoned_executor_stats[None]['running'])
self.statsd.gauge('zuul.executors.unzoned.jobs_queued',
zoned_executor_stats[None]['queued'])
# TODO(corvus): Remove for 5.0:
self.statsd.gauge('zuul.executors.jobs_running',
zoned_executor_stats[None]['running'])
self.statsd.gauge('zuul.executors.jobs_queued',
zoned_executor_stats[None]['queued'])
for zone, stats in zoned_executor_stats.items():
if zone is None:
continue
self.statsd.gauge(
f'zuul.executors.zone.{normalize_statsd_name(zone)}.accepting',
stats["accepting"],
)
self.statsd.gauge(
f'zuul.executors.zone.{normalize_statsd_name(zone)}.online',
stats["online"],
)
self.statsd.gauge(
'zuul.executors.zone.'
f'{normalize_statsd_name(zone)}.jobs_running',
stats['running'])
self.statsd.gauge(
'zuul.executors.zone.'
f'{normalize_statsd_name(zone)}.jobs_queued',
stats['queued'])
# TODO(corvus): Remove for 5.0:
self.statsd.gauge('zuul.executors.accepting', executors_accepting)
self.statsd.gauge('zuul.executors.online', executors_online)
# Publish the merger stats
for merger_component in self.component_registry.all("merger"):
if merger_component.state == BaseComponent.RUNNING:
mergers_online += 1
merge_queue = 0
merge_running = 0
for merge_request in self.merger.merger_api.inState():
if merge_request.state == merge_request.REQUESTED:
merge_queue += 1
if merge_request.state == merge_request.RUNNING:
merge_running += 1
self.statsd.gauge('zuul.mergers.online', mergers_online)
self.statsd.gauge('zuul.mergers.jobs_running', merge_running)
self.statsd.gauge('zuul.mergers.jobs_queued', merge_queue)
self.statsd.gauge('zuul.scheduler.eventqueues.management',
self.reconfigure_event_queue.qsize())
queue_base = 'zuul.scheduler.eventqueues.connection'
conn_base = 'zuul.connection'
for connection in self.connections.connections.values():
queue = connection.getEventQueue()
if queue is not None:
self.statsd.gauge(f'{queue_base}.{connection.connection_name}',
len(queue))
if hasattr(connection, 'estimateCacheDataSize'):
compressed_size, uncompressed_size =\
connection.estimateCacheDataSize()
self.statsd.gauge(f'{conn_base}.{connection.connection_name}.'
'cache.data_size_compressed',
compressed_size)
self.statsd.gauge(f'{conn_base}.{connection.connection_name}.'
'cache.data_size_uncompressed',
uncompressed_size)
for tenant in self.abide.tenants.values():
self.statsd.gauge(f"zuul.tenant.{tenant.name}.management_events",
len(self.management_events[tenant.name]))
self.statsd.gauge(f"zuul.tenant.{tenant.name}.trigger_events",
len(self.trigger_events[tenant.name]))
trigger_event_queues = self.pipeline_trigger_events[tenant.name]
result_event_queues = self.pipeline_result_events[tenant.name]
management_event_queues = (
self.pipeline_management_events[tenant.name]
)
for pipeline in tenant.layout.pipelines.values():
base = f"zuul.tenant.{tenant.name}.pipeline.{pipeline.name}"
self.statsd.gauge(f"{base}.trigger_events",
len(trigger_event_queues[pipeline.name]))
self.statsd.gauge(f"{base}.result_events",
len(result_event_queues[pipeline.name]))
self.statsd.gauge(f"{base}.management_events",
len(management_event_queues[pipeline.name]))
compressed_size, uncompressed_size =\
pipeline.state.estimateDataSize()
self.statsd.gauge(f'{base}.data_size_compressed',
compressed_size)
self.statsd.gauge(f'{base}.data_size_uncompressed',
uncompressed_size)
self.nodepool.emitStatsTotals(self.abide)
def startCleanup(self):
# Run the first cleanup immediately after the first
# reconfiguration.
while not self.stop_event.wait(0):
if self._stopped:
return
if not self.last_reconfigured:
time.sleep(0.1)
continue
try:
self._runSemaphoreCleanup()
except Exception:
self.log.exception("Error in semaphore cleanup:")
if self._stopped:
return
try:
self._runBuildRequestCleanup()
except Exception:
self.log.exception("Error in build request cleanup:")
if self._stopped:
return
try:
self._runNodeRequestCleanup()
except Exception:
self.log.exception("Error in node request cleanup:")
if self._stopped:
return
self.apsched.add_job(self._runSemaphoreCleanup,
trigger=self._semaphore_cleanup_interval)
self.apsched.add_job(self._runBuildRequestCleanup,
trigger=self._build_request_cleanup_interval)
self.apsched.add_job(self._runMergeRequestCleanup,
trigger=self._merge_request_cleanup_interval)
self.apsched.add_job(self._runConnectionCleanup,
trigger=self._connection_cleanup_interval)
self.apsched.add_job(self._runGeneralCleanup,
trigger=self._general_cleanup_interval)
return
def _runSemaphoreCleanup(self):
# Get the layout lock to make sure the abide doesn't change
# under us.
with self.layout_lock:
if self.semaphore_cleanup_lock.acquire(blocking=False):
try:
self.log.debug("Starting semaphore cleanup")
for tenant in self.abide.tenants.values():
try:
tenant.semaphore_handler.cleanupLeaks()
except Exception:
self.log.exception("Error in semaphore cleanup:")
finally:
self.semaphore_cleanup_lock.release()
def _runNodeRequestCleanup(self):
# Get the layout lock to make sure the abide doesn't change
# under us.
with self.layout_lock:
if self.node_request_cleanup_lock.acquire(blocking=False):
try:
self.log.debug("Starting node request cleanup")
try:
self._cleanupNodeRequests()
except Exception:
self.log.exception("Error in node request cleanup:")
finally:
self.node_request_cleanup_lock.release()
def _cleanupNodeRequests(self):
# Get all the requests in ZK that belong to us
zk_requests = set()
for req_id in self.nodepool.zk_nodepool.getNodeRequests():
req = self.nodepool.zk_nodepool.getNodeRequest(req_id, cached=True)
if req.requestor == self.system.system_id:
zk_requests.add(req_id)
# Get all the current node requests in the queues
outstanding_requests = set()
for tenant in self.abide.tenants.values():
for pipeline in tenant.layout.pipelines.values():
with pipeline_lock(
self.zk_client, tenant.name, pipeline.name,
) as lock:
with self.createZKContext(lock, self.log) as ctx:
with pipeline.manager.currentContext(ctx):
pipeline.change_list.refresh(ctx)
pipeline.state.refresh(ctx)
# In case we're in the middle of a reconfig,
# include the old queue items.
for item in pipeline.getAllItems(include_old=True):
nrs = item.current_build_set.node_requests
for req_id in (nrs.values()):
outstanding_requests.add(req_id)
leaked_requests = zk_requests - outstanding_requests
for req_id in leaked_requests:
try:
self.log.warning("Deleting leaked node request: %s", req_id)
self.nodepool.zk_nodepool.deleteNodeRequest(req_id)
except Exception:
self.log.exception("Error deleting leaked node request: %s",
req_id)
def _runGeneralCleanup(self):
self.log.debug("Starting general cleanup")
if self.general_cleanup_lock.acquire(blocking=False):
try:
self._runConfigCacheCleanup()
self._runExecutorApiCleanup()
self._runMergerApiCleanup()
self._runLayoutDataCleanup()
self._runBlobStoreCleanup()
self.maintainConnectionCache()
except Exception:
self.log.exception("Error in general cleanup:")
finally:
self.general_cleanup_lock.release()
# This has its own locking
self._runNodeRequestCleanup()
self.log.debug("Finished general cleanup")
def _runConfigCacheCleanup(self):
with self.layout_lock:
try:
self.log.debug("Starting config cache cleanup")
cached_projects = set(
self.unparsed_config_cache.listCachedProjects())
active_projects = set(
self.abide.unparsed_project_branch_cache.keys())
unused_projects = cached_projects - active_projects
for project_cname in unused_projects:
self.unparsed_config_cache.clearCache(project_cname)
self.log.debug("Finished config cache cleanup")
except Exception:
self.log.exception("Error in config cache cleanup:")
def _runExecutorApiCleanup(self):
try:
self.executor.executor_api.cleanup()
except Exception:
self.log.exception("Error in executor API cleanup:")
def _runMergerApiCleanup(self):
try:
self.merger.merger_api.cleanup()
except Exception:
self.log.exception("Error in merger API cleanup:")
def _runLayoutDataCleanup(self):
try:
self.tenant_layout_state.cleanup()
except Exception:
self.log.exception("Error in layout data cleanup:")
def _runBlobStoreCleanup(self):
self.log.debug("Starting blob store cleanup")
try:
live_blobs = set()
with self.layout_lock:
# get the start ltime so that we can filter out any
# blobs used since this point
start_ltime = self.zk_client.getCurrentLtime()
# lock and refresh the pipeline
for tenant in self.abide.tenants.values():
for pipeline in tenant.layout.pipelines.values():
with pipeline_lock(
self.zk_client, tenant.name,
pipeline.name) as lock,\
self.createZKContext(lock, self.log) as ctx:
pipeline.state.refresh(ctx)
# add any blobstore references
for item in pipeline.getAllItems(include_old=True):
live_blobs.update(item.getBlobKeys())
with self.createZKContext(None, self.log) as ctx:
blobstore = BlobStore(ctx)
# get the set of blob keys unused since the start time
# (ie, we have already filtered any newly added keys)
unused_blobs = blobstore.getKeysLastUsedBefore(start_ltime)
# remove the current refences
unused_blobs -= live_blobs
# delete what's left
for key in unused_blobs:
self.log.debug("Deleting unused blob: %s", key)
blobstore.delete(key, start_ltime)
self.log.debug("Finished blob store cleanup")
except Exception:
self.log.exception("Error in blob store cleanup:")
def _runBuildRequestCleanup(self):
# If someone else is running the cleanup, skip it.
if self.build_request_cleanup_lock.acquire(blocking=False):
try:
self.log.debug("Starting build request cleanup")
self.executor.cleanupLostBuildRequests()
finally:
self.log.debug("Finished build request cleanup")
self.build_request_cleanup_lock.release()
def _runMergeRequestCleanup(self):
# If someone else is running the cleanup, skip it.
if self.merge_request_cleanup_lock.acquire(blocking=False):
try:
self.log.debug("Starting merge request cleanup")
self.merger.cleanupLostMergeRequests()
finally:
self.log.debug("Finished merge request cleanup")
self.merge_request_cleanup_lock.release()
def _runConnectionCleanup(self):
if self.connection_cleanup_lock.acquire(blocking=False):
try:
for connection in self.connections.connections.values():
self.log.debug("Cleaning up connection cache for: %s",
connection)
connection.cleanupCache()
finally:
self.connection_cleanup_lock.release()
def addTriggerEvent(self, driver_name, event):
event.arrived_at_scheduler_timestamp = time.time()
for tenant in self.abide.tenants.values():
trusted, project = tenant.getProject(event.canonical_project_name)
if project is None:
continue
self.trigger_events[tenant.name].put(driver_name, event)
def addChangeManagementEvent(self, event):
tenant_name = event.tenant_name
pipeline_name = event.pipeline_name
tenant = self.abide.tenants.get(tenant_name)
if tenant is None:
raise ValueError(f'Unknown tenant {event.tenant_name}')
pipeline = tenant.layout.pipelines.get(pipeline_name)
if pipeline is None:
raise ValueError(f'Unknown pipeline {event.pipeline_name}')
self.pipeline_management_events[tenant_name][pipeline_name].put(
event, needs_result=False
)
def _reportBuildStats(self, build):
# Note, as soon as the result is set, other threads may act
# upon this, even though the event hasn't been fully
# processed. This could result in race conditions when e.g. skipping
# child jobs via zuul_return. Therefore we must delay setting the
# result to the main event loop.
try:
if self.statsd and build.pipeline:
tenant = build.pipeline.tenant
jobname = build.job.name.replace('.', '_').replace('/', '_')
hostname = (build.build_set.item.change.project.
canonical_hostname.replace('.', '_'))
projectname = (build.build_set.item.change.project.name.
replace('.', '_').replace('/', '_'))
branchname = (getattr(build.build_set.item.change,
'branch', '').
replace('.', '_').replace('/', '_'))
basekey = 'zuul.tenant.%s' % tenant.name
pipekey = '%s.pipeline.%s' % (basekey, build.pipeline.name)
# zuul.tenant.<tenant>.pipeline.<pipeline>.all_jobs
key = '%s.all_jobs' % pipekey
self.statsd.incr(key)
jobkey = '%s.project.%s.%s.%s.job.%s' % (
pipekey, hostname, projectname, branchname, jobname)
# zuul.tenant.<tenant>.pipeline.<pipeline>.project.
# <host>.<project>.<branch>.job.<job>.<result>
key = '%s.%s' % (
jobkey,
'RETRY' if build.result is None else build.result
)
results_with_runtime = ['SUCCESS', 'FAILURE',
'POST_FAILURE', 'TIMED_OUT']
if build.result in results_with_runtime and build.start_time:
dt = (build.end_time - build.start_time) * 1000
self.statsd.timing(key, dt)
self.statsd.incr(key)
# zuul.tenant.<tenant>.pipeline.<pipeline>.project.
# <host>.<project>.<branch>.job.<job>.wait_time
if build.start_time:
key = '%s.wait_time' % jobkey
dt = (build.start_time - build.execute_time) * 1000
self.statsd.timing(key, dt)
except Exception:
self.log.exception("Exception reporting runtime stats")
def reconfigureTenant(self, tenant, project, trigger_event):
if trigger_event:
trigger_event_ltime = trigger_event.zuul_event_ltime
else:
trigger_event_ltime = None
self.log.debug("Submitting tenant reconfiguration event for "
"%s due to event %s in project %s, ltime %s",
tenant.name, trigger_event, project,
trigger_event_ltime)
branch = trigger_event and trigger_event.branch
event = TenantReconfigureEvent(
tenant.name, project.canonical_name, branch,
)
if trigger_event:
event.branch_cache_ltimes[trigger_event.connection_name] = (
trigger_event.branch_cache_ltime)
event.trigger_event_ltime = trigger_event_ltime
self.management_events[tenant.name].put(event, needs_result=False)
def fullReconfigureCommandHandler(self):
self._zuul_app.fullReconfigure()
def smartReconfigureCommandHandler(self):
self._zuul_app.smartReconfigure()
def tenantReconfigureCommandHandler(self, tenant_name):
self._zuul_app.tenantReconfigure([tenant_name])
def zkProfileCommandHandler(self, tenant_name, pipeline_name):
key = set([(tenant_name, pipeline_name)])
self._profile_pipelines = self._profile_pipelines ^ key
self.log.debug("Now profiling %s", self._profile_pipelines)
def startRepl(self):
if self.repl:
return
self.repl = zuul.lib.repl.REPLServer(self)
self.repl.start()
def stopRepl(self):
if not self.repl:
return
self.repl.stop()
self.repl = None
def _reportInitialStats(self, tenant):
if not self.statsd:
return
try:
for pipeline in tenant.layout.pipelines.values():
# stats.gauges.zuul.tenant.<tenant>.pipeline.
# <pipeline>.current_changes
key = 'zuul.tenant.%s.pipeline.%s' % (
tenant.name, pipeline.name)
self.statsd.gauge(key + '.current_changes', 0)
except Exception:
self.log.exception("Exception reporting initial "
"pipeline stats:")
def prime(self, config):
self.log.info("Priming scheduler config")
start = time.monotonic()
if self.system_config_cache.is_valid:
self.log.info("Using system config from Zookeeper")
self.updateSystemConfig()
else:
self.log.info("Creating initial system config")
# This verifies the voluptuous schema
self.primeSystemConfig()
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd, self,
self.merger, self.keystore)
new_tenants = (set(self.unparsed_abide.tenants)
- self.abide.tenants.keys())
with self.layout_lock:
for tenant_name in new_tenants:
stats_key = f'zuul.tenant.{tenant_name}'
layout_state = self.tenant_layout_state.get(tenant_name)
# In case we don't have a cached layout state we need to
# acquire the write lock since we load a new tenant.
if layout_state is None:
# There is no need to use the reconfig lock ID here as
# we are starting from an empty layout state and there
# should be no concurrent read locks.
lock_ctx = tenant_write_lock(self.zk_client, tenant_name)
timer_ctx = self.statsd_timer(
f'{stats_key}.reconfiguration_time')
else:
lock_ctx = tenant_read_lock(self.zk_client, tenant_name)
timer_ctx = nullcontext()
with lock_ctx as tlock, timer_ctx:
# Refresh the layout state now that we are holding the lock
# and we can be sure it won't be changed concurrently.
layout_state = self.tenant_layout_state.get(tenant_name)
layout_uuid = layout_state and layout_state.uuid
if layout_state:
# Get the ltimes from the previous reconfiguration.
min_ltimes = self.tenant_layout_state.getMinLtimes(
layout_state)
branch_cache_min_ltimes = (
layout_state.branch_cache_min_ltimes)
else:
# Consider all caches valid if we don't have a
# layout state.
min_ltimes = defaultdict(
lambda: defaultdict(lambda: -1))
branch_cache_min_ltimes = defaultdict(lambda: -1)
tenant = loader.loadTenant(
self.abide, tenant_name, self.ansible_manager,
self.unparsed_abide, min_ltimes=min_ltimes,
layout_uuid=layout_uuid,
branch_cache_min_ltimes=branch_cache_min_ltimes)
if layout_state is None:
# Reconfigure only tenants w/o an existing layout state
with self.createZKContext(tlock, self.log) as ctx:
self._reconfigureTenant(
ctx, min_ltimes, -1, tenant)
self._reportInitialStats(tenant)
else:
self.local_layout_state[tenant_name] = layout_state
self.connections.reconfigureDrivers(tenant)
# TODO(corvus): Consider removing this implicit reconfigure
# event with v5. Currently the expectation is that if you
# stop a scheduler, change the tenant config, and start it,
# the new tenant config should take effect. If we change that
# expectation with multiple schedulers, we can remove this.
event = ReconfigureEvent(smart=True)
event.zuul_event_ltime = self.zk_client.getCurrentLtime()
self._doReconfigureEvent(event)
# TODO(corvus): This isn't quite accurate; we don't really
# know when the last reconfiguration took place. But we
# need to set some value here in order for the cleanup
# start thread to know that it can proceed. We should
# store the last reconfiguration times in ZK and use them
# here.
self.last_reconfigured = int(time.time())
duration = round(time.monotonic() - start, 3)
self.log.info("Config priming complete (duration: %s seconds)",
duration)
self.primed_event.set()
self.wake_event.set()
self.component_info.state = self.component_info.RUNNING
def reconfigure(self, config, smart=False, tenants=None):
self.log.debug("Submitting reconfiguration event")
event = ReconfigureEvent(smart=smart, tenants=tenants)
event.zuul_event_ltime = self.zk_client.getCurrentLtime()
event.ack_ref = threading.Event()
self.reconfigure_event_queue.put(event)
self.wake_event.set()
self.log.debug("Waiting for reconfiguration")
event.ack_ref.wait()
self.log.debug("Reconfiguration complete")
self.last_reconfigured = int(time.time())
# TODOv3(jeblair): reconfigure time should be per-tenant
def autohold(self, tenant_name, project_name, job_name, ref_filter,
reason, count, node_hold_expiration):
key = (tenant_name, project_name, job_name, ref_filter)
self.log.debug("Autohold requested for %s", key)
request = HoldRequest()
request.tenant = tenant_name
request.project = project_name
request.job = job_name
request.ref_filter = ref_filter
request.reason = reason
request.max_count = count
# Set node_hold_expiration to default if no value is supplied
if node_hold_expiration is None:
node_hold_expiration = self.globals.default_hold_expiration
# Reset node_hold_expiration to max if it exceeds the max
elif self.globals.max_hold_expiration and (
node_hold_expiration == 0 or
node_hold_expiration > self.globals.max_hold_expiration):
node_hold_expiration = self.globals.max_hold_expiration
request.node_expiration = node_hold_expiration
# No need to lock it since we are creating a new one.
self.nodepool.zk_nodepool.storeHoldRequest(request)
def autohold_list(self):
'''
Return current hold requests as a list of dicts.
'''
data = []
for request_id in self.nodepool.zk_nodepool.getHoldRequests():
request = self.nodepool.zk_nodepool.getHoldRequest(request_id)
if not request:
continue
data.append(request.toDict())
return data
def autohold_info(self, hold_request_id):
'''
Get autohold request details.
:param str hold_request_id: The unique ID of the request to delete.
'''
try:
hold_request = self.nodepool.zk_nodepool.getHoldRequest(
hold_request_id)
except Exception:
self.log.exception(
"Error retrieving autohold ID %s:", hold_request_id)
return {}
if hold_request is None:
return {}
return hold_request.toDict()
def autohold_delete(self, hold_request_id):
'''
Delete an autohold request.
:param str hold_request_id: The unique ID of the request to delete.
'''
hold_request = None
try:
hold_request = self.nodepool.zk_nodepool.getHoldRequest(
hold_request_id)
except Exception:
self.log.exception(
"Error retrieving autohold ID %s:", hold_request_id)
if not hold_request:
self.log.info("Ignored request to remove invalid autohold ID %s",
hold_request_id)
return
self.log.debug("Removing autohold %s", hold_request)
try:
self.nodepool.zk_nodepool.deleteHoldRequest(hold_request)
except Exception:
self.log.exception(
"Error removing autohold request %s:", hold_request)
def promote(self, tenant_name, pipeline_name, change_ids):
event = PromoteEvent(tenant_name, pipeline_name, change_ids)
result = self.management_events[tenant_name].put(event)
self.log.debug("Waiting for promotion")
result.wait()
self.log.debug("Promotion complete")
def dequeue(self, tenant_name, pipeline_name, project_name, change, ref):
# We need to do some pre-processing here to get the correct
# form of the project hostname and name based on un-known
# inputs.
tenant = self.abide.tenants.get(tenant_name)
if tenant is None:
raise ValueError(f'Unknown tenant {tenant_name}')
(trusted, project) = tenant.getProject(project_name)
if project is None:
raise ValueError(f'Unknown project {project_name}')
event = DequeueEvent(tenant_name, pipeline_name,
project.canonical_hostname, project.name,
change, ref)
result = self.management_events[tenant_name].put(event)
self.log.debug("Waiting for dequeue")
result.wait()
self.log.debug("Dequeue complete")
def enqueue(self, tenant_name, pipeline_name, project_name,
change, ref, oldrev, newrev):
# We need to do some pre-processing here to get the correct
# form of the project hostname and name based on un-known
# inputs.
tenant = self.abide.tenants.get(tenant_name)
if tenant is None:
raise ValueError(f'Unknown tenant {tenant_name}')
(trusted, project) = tenant.getProject(project_name)
if project is None:
raise ValueError(f'Unknown project {project_name}')
event = EnqueueEvent(tenant_name, pipeline_name,
project.canonical_hostname, project.name,
change, ref, oldrev, newrev)
result = self.management_events[tenant_name].put(event)
self.log.debug("Waiting for enqueue")
result.wait()
self.log.debug("Enqueue complete")
def _get_key_store_password(self):
try:
return self.config["keystore"]["password"]
except KeyError:
raise RuntimeError("No key store password configured!")
def runTenantLayoutUpdates(self):
log = logging.getLogger("zuul.Scheduler.LayoutUpdate")
# Only run this after config priming is complete
self.primed_event.wait()
while not self._stopped:
self.layout_update_event.wait()
self.layout_update_event.clear()
if self._stopped:
break
with self.layout_update_lock:
# We need to handle new and deleted tenants, so we need to
# process all tenants currently known and the new ones.
tenant_names = set(self.abide.tenants)
tenant_names.update(self.unparsed_abide.tenants.keys())
for tenant_name in tenant_names:
if self._stopped:
break
try:
if (self.unparsed_abide.ltime
< self.system_config_cache.ltime):
self.updateSystemConfig()
with tenant_read_lock(self.zk_client, tenant_name,
blocking=False):
remote_state = self.tenant_layout_state.get(
tenant_name)
local_state = self.local_layout_state.get(
tenant_name)
if not local_state and not remote_state:
# The tenant may still be in the
# process of initial configuration
self.layout_update_event.set()
continue
if (local_state is None or
remote_state is None or
remote_state > local_state):
log.debug(
"Local layout of tenant %s not up to date",
tenant_name)
self.updateTenantLayout(log, tenant_name)
# Wake up the main thread to process any
# events for this tenant.
self.wake_event.set()
except LockException:
log.debug(
"Skipping layout update of locked tenant %s",
tenant_name)
self.layout_update_event.set()
except Exception:
log.exception("Error updating layout of tenant %s",
tenant_name)
self.layout_update_event.set()
# In case something is locked, don't busy-loop.
time.sleep(0.1)
def updateTenantLayout(self, log, tenant_name):
log.debug("Updating layout of tenant %s", tenant_name)
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd, self,
self.merger, self.keystore)
# Since we are using the ZK 'locked' context manager with a threading
# lock, we need to pass -1 as the timeout value here as the default
# value for ZK locks is None.
with locked(self.layout_lock, blocking=False, timeout=-1):
start = time.monotonic()
log.debug("Updating local layout of tenant %s ", tenant_name)
layout_state = self.tenant_layout_state.get(tenant_name)
layout_uuid = layout_state and layout_state.uuid
if layout_state:
branch_cache_min_ltimes = layout_state.branch_cache_min_ltimes
else:
# We don't need the cache ltimes as the tenant was deleted
branch_cache_min_ltimes = None
# Get the ltimes from the previous reconfiguration.
if layout_state:
min_ltimes = self.tenant_layout_state.getMinLtimes(
layout_state)
else:
min_ltimes = None
loader.loadTPCs(self.abide, self.unparsed_abide,
[tenant_name])
tenant = loader.loadTenant(
self.abide, tenant_name, self.ansible_manager,
self.unparsed_abide, min_ltimes=min_ltimes,
layout_uuid=layout_uuid,
branch_cache_min_ltimes=branch_cache_min_ltimes)
if tenant is not None:
self.local_layout_state[tenant_name] = layout_state
self.connections.reconfigureDrivers(tenant)
else:
with suppress(KeyError):
del self.local_layout_state[tenant_name]
duration = round(time.monotonic() - start, 3)
self.log.info("Local layout update complete for %s (duration: %s "
"seconds)", tenant_name, duration)
def _checkTenantSourceConf(self, config):
tenant_config = None
script = False
if self.config.has_option(
'scheduler', 'tenant_config'):
tenant_config = self.config.get(
'scheduler', 'tenant_config')
if self.config.has_option(
'scheduler', 'tenant_config_script'):
if tenant_config:
raise Exception(
"tenant_config and tenant_config_script options "
"are exclusive.")
tenant_config = self.config.get(
'scheduler', 'tenant_config_script')
script = True
if not tenant_config:
raise Exception(
"tenant_config or tenant_config_script option "
"is missing from the configuration.")
return tenant_config, script
def validateTenants(self, config, tenants_to_validate):
self.config = config
with self.layout_lock:
self.log.info("Config validation beginning")
start = time.monotonic()
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd,
self, self.merger, self.keystore)
tenant_config, script = self._checkTenantSourceConf(self.config)
unparsed_abide = loader.readConfig(
tenant_config,
from_script=script,
tenants_to_validate=tenants_to_validate)
available_tenants = list(unparsed_abide.tenants)
tenants_to_load = tenants_to_validate or available_tenants
# Use a temporary config cache for the validation
validate_root = f"/zuul/validate/{uuid.uuid4().hex}"
self.unparsed_config_cache = UnparsedConfigCache(self.zk_client,
validate_root)
try:
abide = Abide()
loader.loadAuthzRules(abide, unparsed_abide)
loader.loadSemaphores(abide, unparsed_abide)
loader.loadTPCs(abide, unparsed_abide)
for tenant_name in tenants_to_load:
loader.loadTenant(abide, tenant_name, self.ansible_manager,
unparsed_abide, min_ltimes=None,
ignore_cat_exception=False)
finally:
self.zk_client.client.delete(validate_root, recursive=True)
loading_errors = []
for tenant in abide.tenants.values():
for error in tenant.layout.loading_errors:
loading_errors.append(repr(error))
if loading_errors:
summary = '\n\n\n'.join(loading_errors)
raise configloader.ConfigurationSyntaxError(
f"Configuration errors: {summary}")
duration = round(time.monotonic() - start, 3)
self.log.info("Config validation complete (duration: %s seconds)",
duration)
def _doReconfigureEvent(self, event):
# This is called in the scheduler loop after another thread submits
# a request
reconfigured_tenants = []
with self.layout_lock:
self.log.info("Reconfiguration beginning (smart=%s, tenants=%s)",
event.smart, event.tenants)
start = time.monotonic()
# Update runtime related system attributes from config
self.config = self._zuul_app.config
self.globals = SystemAttributes.fromConfig(self.config)
self.ansible_manager = AnsibleManager(
default_version=self.globals.default_ansible_version)
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd,
self, self.merger, self.keystore)
tenant_config, script = self._checkTenantSourceConf(self.config)
old_unparsed_abide = self.unparsed_abide
self.unparsed_abide = loader.readConfig(
tenant_config, from_script=script)
# Cache system config in Zookeeper
self.system_config_cache.set(self.unparsed_abide, self.globals)
# We need to handle new and deleted tenants, so we need to process
# all tenants currently known and the new ones.
tenant_names = {t for t in self.abide.tenants}
tenant_names.update(self.unparsed_abide.tenants.keys())
# Remove TPCs of deleted tenants
deleted_tenants = tenant_names.difference(
self.unparsed_abide.tenants.keys())
for tenant_name in deleted_tenants:
self.abide.clearTPCs(tenant_name)
loader.loadAuthzRules(self.abide, self.unparsed_abide)
loader.loadSemaphores(self.abide, self.unparsed_abide)
loader.loadTPCs(self.abide, self.unparsed_abide)
if event.smart:
# Consider caches always valid
min_ltimes = defaultdict(
lambda: defaultdict(lambda: -1))
# Consider all project branch caches valid.
branch_cache_min_ltimes = defaultdict(lambda: -1)
else:
# Consider caches valid if the cache ltime >= event ltime
min_ltimes = defaultdict(
lambda: defaultdict(lambda: event.zuul_event_ltime))
# Invalidate the branch cache
for connection in self.connections.connections.values():
if hasattr(connection, 'clearBranchCache'):
if event.tenants:
# Only clear the projects used by this
# tenant (zuul-web won't be able to load
# any tenants that we don't immediately
# reconfigure after clearing)
for tenant_name in event.tenants:
projects = [
tpc.project.name for tpc in
itertools.chain(
self.abide.getConfigTPCs(tenant_name),
self.abide.getUntrustedTPCs(
tenant_name))
]
connection.clearBranchCache(projects)
else:
# Clear all projects since we're reloading
# all tenants.
connection.clearBranchCache()
ltime = self.zk_client.getCurrentLtime()
# Consider the branch cache valid only after we
# cleared it
branch_cache_min_ltimes = defaultdict(lambda: ltime)
for tenant_name in tenant_names:
if event.smart:
old_tenant = old_unparsed_abide.tenants.get(tenant_name)
new_tenant = self.unparsed_abide.tenants.get(tenant_name)
if old_tenant == new_tenant:
continue
if event.tenants and tenant_name not in event.tenants:
continue
old_tenant = self.abide.tenants.get(tenant_name)
stats_key = f'zuul.tenant.{tenant_name}'
with tenant_write_lock(
self.zk_client, tenant_name,
identifier=RECONFIG_LOCK_ID) as lock,\
self.statsd_timer(f'{stats_key}.reconfiguration_time'):
tenant = loader.loadTenant(
self.abide, tenant_name, self.ansible_manager,
self.unparsed_abide, min_ltimes=min_ltimes,
branch_cache_min_ltimes=branch_cache_min_ltimes)
reconfigured_tenants.append(tenant_name)
with self.createZKContext(lock, self.log) as ctx:
if tenant is not None:
self._reconfigureTenant(ctx, min_ltimes,
-1,
tenant, old_tenant)
else:
self._reconfigureDeleteTenant(ctx, old_tenant)
with suppress(KeyError):
del self.tenant_layout_state[tenant_name]
with suppress(KeyError):
del self.local_layout_state[tenant_name]
duration = round(time.monotonic() - start, 3)
self.log.info("Reconfiguration complete (smart: %s, tenants: %s, "
"duration: %s seconds)", event.smart, event.tenants,
duration)
if event.smart:
self.log.info("Reconfigured tenants: %s", reconfigured_tenants)
def _doTenantReconfigureEvent(self, event):
# This is called in the scheduler loop after another thread submits
# a request
if self.unparsed_abide.ltime < self.system_config_cache.ltime:
self.log.debug("Updating system config")
self.updateSystemConfig()
with self.layout_lock:
self.log.info("Tenant reconfiguration beginning for %s due to "
"projects %s",
event.tenant_name, event.project_branches)
start = time.monotonic()
# Consider all caches valid (min. ltime -1) except for the
# changed project-branches.
min_ltimes = defaultdict(lambda: defaultdict(lambda: -1))
for project_name, branch_name in event.project_branches:
if branch_name is None:
min_ltimes[project_name] = defaultdict(
lambda: event.zuul_event_ltime)
else:
min_ltimes[project_name][
branch_name
] = event.zuul_event_ltime
# Consider all branch caches valid except for the ones where
# the events provides a minimum ltime.
branch_cache_min_ltimes = defaultdict(lambda: -1)
for connection_name, ltime in event.branch_cache_ltimes.items():
branch_cache_min_ltimes[connection_name] = ltime
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd,
self, self.merger, self.keystore)
old_tenant = self.abide.tenants.get(event.tenant_name)
loader.loadTPCs(self.abide, self.unparsed_abide,
[event.tenant_name])
stats_key = f'zuul.tenant.{event.tenant_name}'
with tenant_write_lock(
self.zk_client, event.tenant_name,
identifier=RECONFIG_LOCK_ID) as lock,\
self.statsd_timer(f'{stats_key}.reconfiguration_time'):
self.log.debug("Loading tenant %s", event.tenant_name)
loader.loadTenant(
self.abide, event.tenant_name, self.ansible_manager,
self.unparsed_abide, min_ltimes=min_ltimes,
branch_cache_min_ltimes=branch_cache_min_ltimes)
tenant = self.abide.tenants[event.tenant_name]
with self.createZKContext(lock, self.log) as ctx:
self._reconfigureTenant(ctx, min_ltimes,
event.trigger_event_ltime,
tenant, old_tenant)
duration = round(time.monotonic() - start, 3)
self.log.info("Tenant reconfiguration complete for %s (duration: %s "
"seconds)", event.tenant_name, duration)
def _reenqueueGetProject(self, tenant, item):
project = item.change.project
# Attempt to get the same project as the one passed in. If
# the project is now found on a different connection or if it
# is no longer available (due to a connection being removed),
# return None.
(trusted, new_project) = tenant.getProject(project.canonical_name)
if new_project:
if project.connection_name != new_project.connection_name:
return None
return new_project
if item.live:
return None
# If this is a non-live item we may be looking at a
# "foreign" project, ie, one which is not defined in the
# config but is constructed ad-hoc to satisfy a
# cross-repo-dependency. Find the corresponding live item
# and use its source.
child = item
while child and not child.live:
# This assumes that the queue does not branch behind this
# item, which is currently true for non-live items; if
# that changes, this traversal will need to be more
# complex.
if child.items_behind:
child = child.items_behind[0]
else:
child = None
if child is item:
return None
if child and child.live:
(child_trusted, child_project) = tenant.getProject(
child.change.project.canonical_name)
if child_project:
source = child_project.source
new_project = source.getProject(project.name)
return new_project
return None
def _reenqueuePipeline(self, tenant, new_pipeline, context):
self.log.debug("Re-enqueueing changes for pipeline %s",
new_pipeline.name)
# TODO(jeblair): This supports an undocument and
# unanticipated hack to create a static window. If we
# really want to support this, maybe we should have a
# 'static' type? But it may be in use in the wild, so we
# should allow this at least until there's an upgrade
# path.
if (new_pipeline.window and
new_pipeline.window_increase_type == 'exponential' and
new_pipeline.window_decrease_type == 'exponential' and
new_pipeline.window_increase_factor == 1 and
new_pipeline.window_decrease_factor == 1):
static_window = True
else:
static_window = False
items_to_remove = []
builds_to_cancel = []
requests_to_cancel = []
for shared_queue in list(new_pipeline.state.old_queues):
last_head = None
for item in shared_queue.queue:
# If the old item ahead made it in, re-enqueue
# this one behind it.
new_project = self._reenqueueGetProject(
tenant, item)
if item.item_ahead in items_to_remove:
old_item_ahead = None
item_ahead_valid = False
else:
old_item_ahead = item.item_ahead
item_ahead_valid = True
with item.activeContext(context):
item.item_ahead = None
item.items_behind = []
reenqueued = False
if new_project:
item.change.project = new_project
item.pipeline = None
item.queue = None
if not old_item_ahead or not last_head:
last_head = item
try:
reenqueued = new_pipeline.manager.reEnqueueItem(
item, last_head, old_item_ahead,
item_ahead_valid=item_ahead_valid)
except Exception:
self.log.exception(
"Exception while re-enqueing item %s",
item)
if reenqueued:
for build in item.current_build_set.getBuilds():
new_job = item.getJob(build.job.name)
if not new_job:
item.removeBuild(build)
builds_to_cancel.append(build)
for request_job, request in \
item.current_build_set.node_requests.items():
new_job = item.getJob(request_job)
if not new_job:
requests_to_cancel.append(
(item.current_build_set, request))
else:
items_to_remove.append(item)
# Attempt to keep window sizes from shrinking where possible
project, branch = shared_queue.project_branches[0]
new_queue = new_pipeline.getQueue(project, branch)
if new_queue and shared_queue.window and (not static_window):
new_queue.updateAttributes(
context, window=max(shared_queue.window,
new_queue.window_floor))
new_pipeline.state.removeOldQueue(context, shared_queue)
for item in items_to_remove:
self.log.info(
"Removing item %s during reconfiguration" % (item,))
for build in item.current_build_set.getBuilds():
builds_to_cancel.append(build)
for request_job, request in \
item.current_build_set.node_requests.items():
requests_to_cancel.append(
(
item.current_build_set,
request,
item.getJob(request_job),
)
)
try:
self.sql.reportBuildsetEnd(
item.current_build_set, 'dequeue',
final=False, result='DEQUEUED')
except Exception:
self.log.exception(
"Error reporting buildset completion to DB:")
for build in builds_to_cancel:
self.log.info(
"Canceling build %s during reconfiguration" % (build,))
self.cancelJob(build.build_set, build.job, build=build)
for build_set, request, request_job in requests_to_cancel:
self.log.info(
"Canceling node request %s during reconfiguration",
request)
self.cancelJob(build_set, request_job)
def _reconfigureTenant(self, context, min_ltimes,
last_reconfigure_event_ltime, tenant,
old_tenant=None):
# This is called from _doReconfigureEvent while holding the
# layout lock
if old_tenant:
for name, old_pipeline in old_tenant.layout.pipelines.items():
new_pipeline = tenant.layout.pipelines.get(name)
if not new_pipeline:
with old_pipeline.manager.currentContext(context):
self._reconfigureDeletePipeline(old_pipeline)
self.connections.reconfigureDrivers(tenant)
# TODOv3(jeblair): remove postconfig calls?
for pipeline in tenant.layout.pipelines.values():
for trigger in pipeline.triggers:
trigger.postConfig(pipeline)
for reporter in pipeline.actions:
reporter.postConfig()
# Assemble a new list of min. ltimes of the project branch caches.
branch_cache_min_ltimes = {
s.connection.connection_name:
s.getProjectBranchCacheLtime()
for s in self.connections.getSources()
}
# Make sure last_reconfigure_event_ltime never goes backward
old_layout_state = self.tenant_layout_state.get(tenant.name)
if old_layout_state:
if (old_layout_state.last_reconfigure_event_ltime >
last_reconfigure_event_ltime):
self.log.debug("Setting layout state last reconfigure ltime "
"to previous ltime %s which is newer than %s",
old_layout_state.last_reconfigure_event_ltime,
last_reconfigure_event_ltime)
last_reconfigure_event_ltime =\
old_layout_state.last_reconfigure_event_ltime
if last_reconfigure_event_ltime < 0:
last_reconfigure_event_ltime = self.zk_client.getCurrentLtime()
self.log.debug("Setting layout state last reconfigure ltime "
"to current ltime %s", last_reconfigure_event_ltime)
else:
self.log.debug("Setting layout state last reconfigure ltime "
"to %s", last_reconfigure_event_ltime)
layout_state = LayoutState(
tenant_name=tenant.name,
hostname=self.hostname,
last_reconfigured=int(time.time()),
last_reconfigure_event_ltime=last_reconfigure_event_ltime,
uuid=tenant.layout.uuid,
branch_cache_min_ltimes=branch_cache_min_ltimes,
)
# Save the min_ltimes which are sharded before we atomically
# update the layout state.
self.tenant_layout_state.setMinLtimes(layout_state, min_ltimes)
# We need to update the local layout state before the remote state,
# to avoid race conditions in the layout changed callback.
self.local_layout_state[tenant.name] = layout_state
self.tenant_layout_state[tenant.name] = layout_state
def _reconfigureDeleteTenant(self, context, tenant):
# Called when a tenant is deleted during reconfiguration
self.log.info("Removing tenant %s during reconfiguration" %
(tenant,))
for pipeline in tenant.layout.pipelines.values():
with pipeline.manager.currentContext(context):
self._reconfigureDeletePipeline(pipeline)
# Delete the tenant root path for this tenant in ZooKeeper to remove
# all tenant specific event queues
try:
self.zk_client.client.delete(f"{TENANT_ROOT}/{tenant.name}",
recursive=True)
except NotEmptyError:
# In case a build result has been submitted during the
# reconfiguration, this cleanup will fail. We handle this in a
# periodic cleanup job.
pass
def _reconfigureDeletePipeline(self, pipeline):
self.log.info("Removing pipeline %s during reconfiguration" %
(pipeline,))
for shared_queue in pipeline.queues:
builds_to_cancel = []
requests_to_cancel = []
for item in shared_queue.queue:
with item.activeContext(pipeline.manager.current_context):
item.item_ahead = None
item.items_behind = []
self.log.info(
"Removing item %s during reconfiguration" % (item,))
for build in item.current_build_set.getBuilds():
builds_to_cancel.append(build)
for request_job, request in \
item.current_build_set.node_requests.items():
requests_to_cancel.append(
(
item.current_build_set,
request,
item.getJob(request_job),
)
)
try:
self.sql.reportBuildsetEnd(
item.current_build_set, 'dequeue',
final=False, result='DEQUEUED')
except Exception:
self.log.exception(
"Error reporting buildset completion to DB:")
for build in builds_to_cancel:
self.log.info(
"Canceling build %s during reconfiguration" % (build,))
self.cancelJob(build.build_set, build.job,
build=build, force=True)
for build_set, request, request_job in requests_to_cancel:
self.log.info(
"Canceling node request %s during reconfiguration",
request)
self.cancelJob(build_set, request_job, force=True)
shared_queue.delete(pipeline.manager.current_context)
def _doPromoteEvent(self, event):
tenant = self.abide.tenants.get(event.tenant_name)
pipeline = tenant.layout.pipelines[event.pipeline_name]
change_ids = [c.split(',') for c in event.change_ids]
items_to_enqueue = []
change_queue = None
# A list of (queue, items); the queue should be promoted
# within the pipeline, and the items should be promoted within
# the queue.
promote_operations = OrderedDict()
for number, patchset in change_ids:
found = False
for shared_queue in pipeline.queues:
for item in shared_queue.queue:
if not item.live:
continue
if (item.change.number == number and
item.change.patchset == patchset):
promote_operations.setdefault(
shared_queue, []).append(item)
found = True
break
if found:
break
if not found:
raise Exception("Unable to find %s,%s" % (number, patchset))
# Reverse the promote operations so that we promote the first
# change queue last (which will put it at the top).
for change_queue, items_to_enqueue in\
reversed(promote_operations.items()):
# We can leave changes in the pipeline as long as the head
# remains identical; as soon as we make a change, we have
# to re-enqueue everything behind it in order to ensure
# dependencies are correct.
head_same = True
for item in change_queue.queue[:]:
if item.live and item == items_to_enqueue[0] and head_same:
# We can skip this one and leave it in place
items_to_enqueue.pop(0)
continue
elif not item.live:
# Ignore this; if the actual item behind it is
# dequeued, it will get cleaned up eventually.
continue
if item not in items_to_enqueue:
items_to_enqueue.append(item)
head_same = False
pipeline.manager.cancelJobs(item)
pipeline.manager.dequeueItem(item)
for item in items_to_enqueue:
pipeline.manager.addChange(
item.change, item.event,
enqueue_time=item.enqueue_time,
quiet=True,
ignore_requirements=True)
# Regardless, move this shared change queue to the head.
pipeline.promoteQueue(change_queue)
def _doDequeueEvent(self, event):
tenant = self.abide.tenants.get(event.tenant_name)
if tenant is None:
raise ValueError('Unknown tenant %s' % event.tenant_name)
pipeline = tenant.layout.pipelines.get(event.pipeline_name)
if pipeline is None:
raise ValueError('Unknown pipeline %s' % event.pipeline_name)
canonical_name = event.project_hostname + '/' + event.project_name
(trusted, project) = tenant.getProject(canonical_name)
if project is None:
raise ValueError('Unknown project %s' % event.project_name)
change_key = project.source.getChangeKey(event)
change = project.source.getChange(change_key, event=event)
if change.project.name != project.name:
if event.change:
item = 'Change %s' % event.change
else:
item = 'Ref %s' % event.ref
raise Exception('%s does not belong to project "%s"'
% (item, project.name))
for shared_queue in pipeline.queues:
for item in shared_queue.queue:
if item.change.project != change.project:
continue
if (isinstance(item.change, Change) and
item.change.number == change.number and
item.change.patchset == change.patchset) or\
(item.change.ref == change.ref):
pipeline.manager.removeItem(item)
return
raise Exception("Unable to find shared change queue for %s:%s" %
(event.project_name,
event.change or event.ref))
def _doEnqueueEvent(self, event):
tenant = self.abide.tenants.get(event.tenant_name)
if tenant is None:
raise ValueError(f'Unknown tenant {event.tenant_name}')
pipeline = tenant.layout.pipelines.get(event.pipeline_name)
if pipeline is None:
raise ValueError(f'Unknown pipeline {event.pipeline_name}')
canonical_name = event.project_hostname + '/' + event.project_name
(trusted, project) = tenant.getProject(canonical_name)
if project is None:
raise ValueError(f'Unknown project {event.project_name}')
try:
change_key = project.source.getChangeKey(event)
change = project.source.getChange(change_key,
event=event, refresh=True)
except Exception as exc:
raise ValueError('Unknown change') from exc
if change.project.name != project.name:
raise Exception(
f'Change {change} does not belong to project "{project.name}"')
self.log.debug("Event %s for change %s was directly assigned "
"to pipeline %s", event, change, self)
pipeline.manager.addChange(change, event, ignore_requirements=True)
def _doSupercedeEvent(self, event):
tenant = self.abide.tenants[event.tenant_name]
pipeline = tenant.layout.pipelines[event.pipeline_name]
canonical_name = f"{event.project_hostname}/{event.project_name}"
trusted, project = tenant.getProject(canonical_name)
if project is None:
return
change_key = project.source.getChangeKey(event)
change = project.source.getChange(change_key, event=event)
for shared_queue in pipeline.queues:
for item in shared_queue.queue:
if item.change.project != change.project:
continue
if not item.live:
continue
if ((isinstance(item.change, Change)
and item.change.number == change.number
and item.change.patchset == change.patchset
) or (item.change.ref == change.ref)):
self.log.info("Item %s is superceded, dequeuing", item)
pipeline.manager.removeItem(item)
return
def _doSemaphoreReleaseEvent(self, event, pipeline):
tenant = pipeline.tenant
semaphore = tenant.layout.getSemaphore(
self.abide, event.semaphore_name)
if semaphore.global_scope:
tenants = [t for t in self.abide.tenants.values()
if event.semaphore_name in t.global_semaphores]
else:
tenants = [tenant]
for tenant in tenants:
for pipeline_name in tenant.layout.pipelines.keys():
if (tenant.name == pipeline.tenant.name and
pipeline_name == pipeline.name):
# This pipeline is already awake because it is
# where this event originated.
continue
event = PipelineSemaphoreReleaseEvent()
self.pipeline_management_events[
tenant.name][pipeline_name].put(
event, needs_result=False)
def _areAllBuildsComplete(self):
self.log.debug("Checking if all builds are complete")
waiting = False
for tenant in self.abide.tenants.values():
for pipeline in tenant.layout.pipelines.values():
for item in pipeline.getAllItems():
for build in item.current_build_set.getBuilds():
if build.result is None:
self.log.debug("%s waiting on %s" %
(pipeline.manager, build))
waiting = True
if not waiting:
self.log.debug("All builds are complete")
return True
return False
def run(self):
if self.statsd:
self.log.debug("Statsd enabled")
else:
self.log.debug("Statsd not configured")
if self.wait_for_init:
self.log.debug("Waiting for tenant initialization")
self.primed_event.wait()
while True:
self.log.debug("Run handler sleeping")
self.wake_event.wait()
self.wake_event.clear()
if self._stopped:
self.log.debug("Run handler stopping")
return
self.log.debug("Run handler awake")
self.run_handler_lock.acquire()
try:
if not self._stopped:
self.process_reconfigure_queue()
if self.unparsed_abide.ltime < self.system_config_cache.ltime:
self.updateSystemConfig()
for tenant_name in self.unparsed_abide.tenants:
if self._stopped:
break
tenant = self.abide.tenants.get(tenant_name)
if not tenant:
continue
# This will also forward events for the pipelines
# (e.g. enqueue or dequeue events) to the matching
# pipeline event queues that are processed afterwards.
self.process_tenant_management_queue(tenant)
if self._stopped:
break
try:
with tenant_read_lock(
self.zk_client, tenant_name, blocking=False
) as tlock:
remote_state = self.tenant_layout_state.get(
tenant_name)
if remote_state is None:
# The tenant may still be in the
# process of initial configuration
self.wake_event.set()
continue
local_state = self.local_layout_state.get(
tenant_name)
if (local_state is None or
remote_state > local_state):
self.log.debug(
"Local layout of tenant %s not up to date",
tenant.name)
self.layout_update_event.set()
continue
# Get tenant again, as it might have been updated
# by a tenant reconfig or layout change.
tenant = self.abide.tenants[tenant_name]
if not self._stopped:
# This will forward trigger events to pipeline
# event queues that are processed below.
self.process_tenant_trigger_queue(tenant)
self.process_pipelines(tenant, tlock)
except LockException:
self.log.debug("Skipping locked tenant %s",
tenant.name)
remote_state = self.tenant_layout_state.get(
tenant_name)
local_state = self.local_layout_state.get(
tenant_name)
if (remote_state is None or
local_state is None or
remote_state > local_state):
# Let's keep looping until we've updated to the
# latest tenant layout.
self.wake_event.set()
except Exception:
self.log.exception("Exception processing tenant %s:",
tenant_name)
# There may still be more events to process
self.wake_event.set()
except Exception:
self.log.exception("Exception in run handler:")
# There may still be more events to process
self.wake_event.set()
finally:
self.run_handler_lock.release()
def primeSystemConfig(self):
with self.layout_lock:
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd,
self, self.merger, self.keystore)
tenant_config, script = self._checkTenantSourceConf(self.config)
self.unparsed_abide = loader.readConfig(
tenant_config, from_script=script)
self.system_config_cache.set(self.unparsed_abide, self.globals)
loader.loadAuthzRules(self.abide, self.unparsed_abide)
loader.loadSemaphores(self.abide, self.unparsed_abide)
loader.loadTPCs(self.abide, self.unparsed_abide)
def updateSystemConfig(self):
with self.layout_lock:
self.unparsed_abide, self.globals = self.system_config_cache.get()
self.ansible_manager = AnsibleManager(
default_version=self.globals.default_ansible_version)
loader = configloader.ConfigLoader(
self.connections, self.zk_client, self.globals, self.statsd,
self, self.merger, self.keystore)
tenant_names = set(self.abide.tenants)
deleted_tenants = tenant_names.difference(
self.unparsed_abide.tenants.keys())
# Remove TPCs of deleted tenants
for tenant_name in deleted_tenants:
self.abide.clearTPCs(tenant_name)
loader.loadAuthzRules(self.abide, self.unparsed_abide)
loader.loadSemaphores(self.abide, self.unparsed_abide)
loader.loadTPCs(self.abide, self.unparsed_abide)
def process_pipelines(self, tenant, tenant_lock):
for pipeline in tenant.layout.pipelines.values():
if self._stopped:
return
if RECONFIG_LOCK_ID in tenant_lock.contenders():
self.log.debug("Stopping tenant %s pipeline processing due to "
"pending reconfig", tenant.name)
self.wake_event.set()
return
stats_key = f'zuul.tenant.{tenant.name}.pipeline.{pipeline.name}'
try:
with pipeline_lock(
self.zk_client, tenant.name, pipeline.name,
blocking=False) as lock,\
self.createZKContext(lock, self.log) as ctx:
with pipeline.manager.currentContext(ctx):
with self.statsd_timer(f'{stats_key}.handling'):
refreshed = self._process_pipeline(
tenant, pipeline)
# Update pipeline summary for zuul-web
if refreshed:
pipeline.summary.update(ctx, self.globals)
if self.statsd:
self._contextStats(ctx, stats_key)
except LockException:
self.log.debug("Skipping locked pipeline %s in tenant %s",
pipeline.name, tenant.name)
try:
# In case this pipeline is locked for some reason
# other than processing events, we need to return
# to it to process them.
if self._pipelineHasEvents(tenant, pipeline):
self.wake_event.set()
except Exception:
self.log.exception(
"Exception checking events for pipeline "
"%s in tenant %s",
pipeline.name, tenant.name)
except Exception:
self.log.exception(
"Exception processing pipeline %s in tenant %s",
pipeline.name, tenant.name)
def _contextStats(self, ctx, stats_key):
self.statsd.timing(f'{stats_key}.read_time',
ctx.cumulative_read_time * 1000)
self.statsd.timing(f'{stats_key}.write_time',
ctx.cumulative_write_time * 1000)
self.statsd.gauge(f'{stats_key}.read_objects',
ctx.cumulative_read_objects)
self.statsd.gauge(f'{stats_key}.write_objects',
ctx.cumulative_write_objects)
self.statsd.gauge(f'{stats_key}.read_znodes',
ctx.cumulative_read_znodes)
self.statsd.gauge(f'{stats_key}.write_znodes',
ctx.cumulative_write_znodes)
self.statsd.gauge(f'{stats_key}.read_bytes',
ctx.cumulative_read_bytes)
self.statsd.gauge(f'{stats_key}.write_bytes',
ctx.cumulative_write_bytes)
def _pipelineHasEvents(self, tenant, pipeline):
return any((
self.pipeline_trigger_events[
tenant.name][pipeline.name].hasEvents(),
self.pipeline_result_events[
tenant.name][pipeline.name].hasEvents(),
self.pipeline_management_events[
tenant.name][pipeline.name].hasEvents(),
pipeline.state.isDirty(self.zk_client.client),
))
def _process_pipeline(self, tenant, pipeline):
# Return whether or not we refreshed the pipeline.
# We only need to process the pipeline if there are
# outstanding events.
if not self._pipelineHasEvents(tenant, pipeline):
self.log.debug("No events to process for pipeline %s in tenant %s",
pipeline.name, tenant.name)
return False
stats_key = f'zuul.tenant.{tenant.name}.pipeline.{pipeline.name}'
ctx = pipeline.manager.current_context
if (tenant.name, pipeline.name) in self._profile_pipelines:
ctx.profile = True
with self.statsd_timer(f'{stats_key}.refresh'):
pipeline.change_list.refresh(ctx)
pipeline.summary.refresh(ctx)
pipeline.state.refresh(ctx)
if (tenant.name, pipeline.name) in self._profile_pipelines:
ctx.profile = False
pipeline.state.setDirty(self.zk_client.client)
if pipeline.state.old_queues:
self._reenqueuePipeline(tenant, pipeline, ctx)
pipeline.state.cleanup(ctx)
with self.statsd_timer(f'{stats_key}.event_process'):
self.process_pipeline_management_queue(tenant, pipeline)
# Give result events priority -- they let us stop builds,
# whereas trigger events cause us to execute builds.
self.process_pipeline_result_queue(tenant, pipeline)
self.process_pipeline_trigger_queue(tenant, pipeline)
try:
with self.statsd_timer(f'{stats_key}.process'):
while not self._stopped and pipeline.manager.processQueue():
pass
except Exception:
self.log.exception("Exception in pipeline processing:")
pipeline.state.updateAttributes(
ctx, state=pipeline.STATE_ERROR)
# Continue processing other pipelines+tenants
else:
pipeline.state.updateAttributes(
ctx, state=pipeline.STATE_NORMAL)
pipeline.state.clearDirty(self.zk_client.client)
return True
def _gatherConnectionCacheKeys(self):
relevant = set()
with self.layout_lock,\
self.createZKContext(None, self.log) as ctx:
for tenant in self.abide.tenants.values():
for pipeline in tenant.layout.pipelines.values():
self.log.debug("Gather relevant cache items for: %s %s",
tenant.name, pipeline.name)
pipeline.change_list.refresh(ctx)
change_keys = pipeline.change_list.getChangeKeys()
relevant_changes = pipeline.manager.resolveChangeKeys(
change_keys)
for change in relevant_changes:
relevant.add(change.cache_stat.key)
return relevant
def maintainConnectionCache(self):
self.log.debug("Starting connection cache maintenance")
relevant = self._gatherConnectionCacheKeys()
# We'll only remove changes older than `max_age` from the cache, as
# it may take a while for an event that was processed by a connection
# (which updated/populated the cache) to end up in a pipeline.
for connection in self.connections.connections.values():
connection.maintainCache(relevant, max_age=7200) # 2h
self.log.debug("Finished connection cache maintenance for: %s",
connection)
self.log.debug("Finished connection cache maintenance")
def process_tenant_trigger_queue(self, tenant):
try:
with trigger_queue_lock(
self.zk_client, tenant.name, blocking=False
):
# Update the pipeline changes
ctx = self.createZKContext(None, self.log)
for pipeline in tenant.layout.pipelines.values():
try:
pipeline.change_list.refresh(ctx)
except Exception:
self.log.exception(
"Unable to refresh pipeline change list for %s",
pipeline.name)
# Get the ltime of the last reconfiguration event
self.trigger_events[tenant.name].refreshMetadata()
for event in self.trigger_events[tenant.name]:
log = get_annotated_logger(self.log, event.zuul_event_id)
log.debug("Forwarding trigger event %s", event)
try:
trigger_span = tracing.restoreSpanContext(
event.span_context)
with self.tracer.start_as_current_span(
"TenantTriggerEventProcessing",
links=[
trace.Link(trigger_span.get_span_context())
]):
self._forward_trigger_event(event, tenant)
except Exception:
log.exception("Unable to forward event %s "
"to tenant %s", event, tenant.name)
finally:
self.trigger_events[tenant.name].ack(event)
self.trigger_events[tenant.name].cleanup()
except LockException:
self.log.debug("Skipping locked trigger event queue in tenant %s",
tenant.name)
def _forward_trigger_event(self, event, tenant):
log = get_annotated_logger(self.log, event.zuul_event_id)
trusted, project = tenant.getProject(event.canonical_project_name)
if project is None:
return
try:
change_key = project.source.getChangeKey(event)
change = project.source.getChange(change_key, event=event)
except exceptions.ChangeNotFound as e:
log.debug("Unable to get change %s from source %s",
e.change, project.source)
return
reconfigure_tenant = False
if (event.branch_updated and
hasattr(change, 'files') and
change.updatesConfig(tenant)):
reconfigure_tenant = True
if change.files is None:
log.debug("Reconfiguring tenant after branch updated "
"without file list, assuming config update")
elif (event.branch_deleted and
self.abide.hasUnparsedBranchCache(project.canonical_name,
event.branch)):
reconfigure_tenant = True
# The branch_created attribute is also true when a tag is
# created. Since we load config only from branches only trigger
# a tenant reconfiguration if the branch is set as well.
if event.branch_created and event.branch:
reconfigure_tenant = True
# If the driver knows the branch but we don't have a config, we
# also need to reconfigure. This happens if a GitHub branch
# was just configured as protected without a push in between.
elif (event.branch in project.source.getProjectBranches(
project, tenant, min_ltime=event.branch_cache_ltime)
and not self.abide.hasUnparsedBranchCache(
project.canonical_name, event.branch)):
reconfigure_tenant = True
# If the branch is unprotected and unprotected branches
# are excluded from the tenant for that project skip reconfig.
if (reconfigure_tenant and not
event.branch_protected and
tenant.getExcludeUnprotectedBranches(project)):
reconfigure_tenant = False
# If all config classes are excluded for this project we don't need
# to trigger a reconfiguration.
tpc = tenant.project_configs.get(project.canonical_name)
if tpc and not tpc.load_classes:
reconfigure_tenant = False
# If we are listing included branches and this branch
# is not included, skip reconfig.
if (reconfigure_tenant and
not tpc.includesBranch(event.branch)):
reconfigure_tenant = False
# But if the event is that branch protection status has
# changed, do reconfigure.
if (event.isBranchProtectionChanged()):
reconfigure_tenant = True
if reconfigure_tenant:
# The change that just landed updates the config
# or a branch was just created or deleted. Clear
# out cached data for this project and perform a
# reconfiguration.
self.reconfigureTenant(tenant, change.project, event)
# This will become the new required minimum event ltime
# for every trigger event processed after the
# reconfiguration, so make sure we update it after having
# submitted the reconfiguration event.
self.trigger_events[tenant.name].last_reconfigure_event_ltime =\
event.zuul_event_ltime
event.min_reconfigure_ltime = self.trigger_events[
tenant.name].last_reconfigure_event_ltime
span = trace.get_current_span()
span.set_attribute("reconfigure_tenant", reconfigure_tenant)
event.span_context = tracing.getSpanContext(span)
for pipeline in tenant.layout.pipelines.values():
if (
pipeline.manager.eventMatches(event, change)
or pipeline.manager.isAnyVersionOfChangeInPipeline(change)
):
self.pipeline_trigger_events[tenant.name][
pipeline.name
].put(event.driver_name, event)
def process_pipeline_trigger_queue(self, tenant, pipeline):
for event in self.pipeline_trigger_events[tenant.name][pipeline.name]:
if self._stopped:
return
log = get_annotated_logger(self.log, event.zuul_event_id)
if not isinstance(event, SupercedeEvent):
local_state = self.local_layout_state[tenant.name]
last_ltime = local_state.last_reconfigure_event_ltime
# The event tells us the ltime of the most recent
# reconfiguration event up to that point. If our local
# layout state wasn't generated by an event after that
# time, then we are too out of date to process this event.
# Abort now and wait for an update.
if (event.min_reconfigure_ltime > -1 and
event.min_reconfigure_ltime > last_ltime):
log.debug("Trigger event minimum reconfigure ltime of %s "
"newer than current reconfigure ltime of %s, "
"aborting early",
event.min_reconfigure_ltime, last_ltime)
return
log.debug("Processing trigger event %s", event)
try:
if isinstance(event, SupercedeEvent):
self._doSupercedeEvent(event)
else:
self._process_trigger_event(tenant, pipeline, event)
finally:
self.pipeline_trigger_events[tenant.name][
pipeline.name
].ack(event)
self.pipeline_trigger_events[tenant.name][pipeline.name].cleanup()
def _process_trigger_event(self, tenant, pipeline, event):
log = get_annotated_logger(
self.log, event.zuul_event_id
)
trusted, project = tenant.getProject(event.canonical_project_name)
if project is None:
return
try:
change_key = project.source.getChangeKey(event)
change = project.source.getChange(change_key, event=event)
except exceptions.ChangeNotFound as e:
log.debug("Unable to get change %s from source %s",
e.change, project.source)
return
if event.isPatchsetCreated():
pipeline.manager.removeOldVersionsOfChange(change, event)
elif event.isChangeAbandoned():
pipeline.manager.removeAbandonedChange(change, event)
# Let the pipeline update any dependencies that may need
# refreshing if this change has updated.
if event.isPatchsetCreated() or event.isMessageChanged():
pipeline.manager.refreshDeps(change, event)
if pipeline.manager.eventMatches(event, change):
pipeline.manager.addChange(change, event)
def process_tenant_management_queue(self, tenant):
try:
with management_queue_lock(
self.zk_client, tenant.name, blocking=False
):
self._process_tenant_management_queue(tenant)
except LockException:
self.log.debug("Skipping locked management event queue"
" in tenant %s", tenant.name)
def _process_tenant_management_queue(self, tenant):
for event in self.management_events[tenant.name]:
event_forwarded = False
try:
if isinstance(event, TenantReconfigureEvent):
self.log.debug("Processing tenant reconfiguration "
"event for tenant %s", tenant.name)
self._doTenantReconfigureEvent(event)
elif isinstance(event, (PromoteEvent, ChangeManagementEvent)):
event_forwarded = self._forward_management_event(event)
else:
self.log.error("Unable to handle event %s for tenant %s",
event, tenant.name)
finally:
if event_forwarded:
self.management_events[tenant.name].ackWithoutResult(
event)
else:
self.management_events[tenant.name].ack(event)
self.management_events[tenant.name].cleanup()
def _forward_management_event(self, event):
event_forwarded = False
try:
tenant = self.abide.tenants.get(event.tenant_name)
if tenant is None:
raise ValueError(f'Unknown tenant {event.tenant_name}')
pipeline = tenant.layout.pipelines.get(event.pipeline_name)
if pipeline is None:
raise ValueError(f'Unknown pipeline {event.pipeline_name}')
self.pipeline_management_events[tenant.name][
pipeline.name
].put(event)
event_forwarded = True
except Exception:
event.exception(
"".join(
traceback.format_exception(*sys.exc_info())
)
)
return event_forwarded
def process_reconfigure_queue(self):
while not self.reconfigure_event_queue.empty() and not self._stopped:
self.log.debug("Fetching reconfiguration event")
event = self.reconfigure_event_queue.get()
try:
if isinstance(event, ReconfigureEvent):
self._doReconfigureEvent(event)
else:
self.log.error("Unable to handle event %s", event)
finally:
if event.ack_ref:
event.ack_ref.set()
self.reconfigure_event_queue.task_done()
def process_pipeline_management_queue(self, tenant, pipeline):
for event in self.pipeline_management_events[tenant.name][
pipeline.name
]:
if self._stopped:
return
log = get_annotated_logger(self.log, event.zuul_event_id)
log.debug("Processing management event %s", event)
try:
self._process_management_event(event)
finally:
self.pipeline_management_events[tenant.name][
pipeline.name
].ack(event)
self.pipeline_management_events[tenant.name][pipeline.name].cleanup()
def _process_management_event(self, event):
try:
if isinstance(event, PromoteEvent):
self._doPromoteEvent(event)
elif isinstance(event, DequeueEvent):
self._doDequeueEvent(event)
elif isinstance(event, EnqueueEvent):
self._doEnqueueEvent(event)
elif isinstance(event, PipelinePostConfigEvent):
# We don't need to do anything; the event just
# triggers a pipeline run.
pass
elif isinstance(event, PipelineSemaphoreReleaseEvent):
# Same as above.
pass
else:
self.log.error("Unable to handle event %s" % event)
except Exception:
self.log.exception("Exception in management event:")
event.exception(
"".join(traceback.format_exception(*sys.exc_info()))
)
def process_pipeline_result_queue(self, tenant, pipeline):
for event in self.pipeline_result_events[tenant.name][pipeline.name]:
if self._stopped:
return
log = get_annotated_logger(
self.log,
event=getattr(event, "zuul_event_id", None),
build=getattr(event, "build_uuid", None),
)
log.debug("Processing result event %s", event)
try:
self._process_result_event(event, pipeline)
finally:
self.pipeline_result_events[tenant.name][
pipeline.name
].ack(event)
self.pipeline_result_events[tenant.name][pipeline.name].cleanup()
def _process_result_event(self, event, pipeline):
if isinstance(event, BuildStartedEvent):
self._doBuildStartedEvent(event, pipeline)
elif isinstance(event, BuildStatusEvent):
self._doBuildStatusEvent(event, pipeline)
elif isinstance(event, BuildPausedEvent):
self._doBuildPausedEvent(event, pipeline)
elif isinstance(event, BuildCompletedEvent):
self._doBuildCompletedEvent(event, pipeline)
elif isinstance(event, MergeCompletedEvent):
self._doMergeCompletedEvent(event, pipeline)
elif isinstance(event, FilesChangesCompletedEvent):
self._doFilesChangesCompletedEvent(event, pipeline)
elif isinstance(event, NodesProvisionedEvent):
self._doNodesProvisionedEvent(event, pipeline)
elif isinstance(event, SemaphoreReleaseEvent):
self._doSemaphoreReleaseEvent(event, pipeline)
else:
self.log.error("Unable to handle event %s", event)
def _getBuildSetFromPipeline(self, event, pipeline):
log = get_annotated_logger(
self.log,
event=getattr(event, "zuul_event_id", None),
build=getattr(event, "build_uuid", None),
)
if not pipeline:
log.warning(
"Build set %s is not associated with a pipeline",
event.build_set_uuid,
)
return
for item in pipeline.getAllItems():
# If the provided buildset UUID doesn't match any current one,
# we assume that it's not current anymore.
if item.current_build_set.uuid == event.build_set_uuid:
return item.current_build_set
log.warning("Build set %s is not current", event.build_set_uuid)
def _getBuildFromPipeline(self, event, pipeline):
log = get_annotated_logger(
self.log, event.zuul_event_id, build=event.build_uuid)
build_set = self._getBuildSetFromPipeline(event, pipeline)
if not build_set:
return
build = build_set.getBuild(event.job_name)
# Verify that the build uuid matches the one of the result
if not build:
log.debug(
"Build %s could not be found in the current buildset",
event.build_uuid)
return
# Verify that the build UUIDs match since we looked up the build by
# its job name. In case of a retried build, we might already have a new
# build in the buildset.
# TODO (felix): Not sure if that reasoning is correct, but I think it
# shouldn't harm to have such an additional safeguard.
if not build.uuid == event.build_uuid:
log.debug(
"Build UUID %s doesn't match the current build's UUID %s",
event.build_uuid, build.uuid)
return
return build
def _doBuildStartedEvent(self, event, pipeline):
build = self._getBuildFromPipeline(event, pipeline)
if not build:
return
with build.activeContext(pipeline.manager.current_context):
build.start_time = event.data["start_time"]
log = get_annotated_logger(
self.log, build.zuul_event_id, build=build.uuid)
try:
change = build.build_set.item.change
estimate = self.times.getEstimatedTime(
pipeline.tenant.name,
change.project.name,
getattr(change, 'branch', None),
build.job.name)
if not estimate:
estimate = 0.0
build.estimated_time = estimate
except Exception:
log.exception("Exception estimating build time:")
pipeline.manager.onBuildStarted(build)
def _doBuildStatusEvent(self, event, pipeline):
build = self._getBuildFromPipeline(event, pipeline)
if not build:
return
# Allow URL to be updated
build.updateAttributes(pipeline.manager.current_context,
url=event.data.get('url', build.url))
def _doBuildPausedEvent(self, event, pipeline):
build = self._getBuildFromPipeline(event, pipeline)
if not build:
return
# Setting paused is deferred to event processing stage to avoid a race
# with child job skipping.
with build.activeContext(pipeline.manager.current_context):
build.paused = True
build.setResultData(
event.data.get("data", {}),
event.data.get("secret_data", {}))
pipeline.manager.onBuildPaused(build)
def _doBuildCompletedEvent(self, event, pipeline):
log = get_annotated_logger(
self.log, event.zuul_event_id, build=event.build_uuid)
build = self._getBuildFromPipeline(event, pipeline)
if not build:
self.log.error(
"Unable to find build %s. Creating a fake build to clean up "
"build resources.",
event.build_uuid)
# Create a fake build with a minimal set of attributes that
# allows reporting the build via SQL and cleaning up build
# resources.
build = Build()
build._set(
job=Job(event.job_name),
uuid=event.build_uuid,
zuul_event_id=event.zuul_event_id,
# Set the build_request_ref on the fake build to make the
# cleanup work.
build_request_ref=event.build_request_ref,
# TODO (felix): Do we have to fully evaluate the build
# result (see the if/else block with different results
# further down) or is it sufficient to just use the result
# as-is from the executor since the build is anyways
# outdated. In case the build result is None it won't be
# changed to RETRY.
result=event.data.get("result"),
)
self._cleanupCompletedBuild(build)
try:
self.sql.reportBuildEnd(
build, tenant=pipeline.tenant.name,
final=True)
except Exception:
log.exception("Error reporting build completion to DB:")
# Make sure we don't forward this outdated build result with
# an incomplete (fake) build object to the pipeline manager.
return
event_result = event.data
result = event_result.get("result")
result_data = event_result.get("data", {})
secret_result_data = event_result.get("secret_data", {})
warnings = event_result.get("warnings", [])
log.info("Build complete, result %s, warnings %s", result, warnings)
with build.activeContext(pipeline.manager.current_context):
build.error_detail = event_result.get("error_detail")
if result is None:
build.retry = True
if result == "ABORTED":
# Always retry if the executor just went away
build.retry = True
# TODO: Remove merger_failure in v6.0
if result in ["MERGE_CONFLICT", "MERGER_FAILURE"]:
# The build result MERGE_CONFLICT is a bit misleading here
# because when we got here we know that there are no merge
# conflicts. Instead this is most likely caused by some
# infrastructure failure. This can be anything like connection
# issue, drive corruption, full disk, corrupted git cache, etc.
# This may or may not be a recoverable failure so we should
# retry here respecting the max retries. But to be able to
# distinguish from RETRY_LIMIT which normally indicates pre
# playbook failures we keep the build result after the max
# attempts.
if build.build_set.getTries(
build.job.name) < build.job.attempts:
build.retry = True
if build.retry:
result = "RETRY"
# If the build was canceled, we did actively cancel the job so
# don't overwrite the result and don't retry.
if build.canceled:
result = build.result or "CANCELED"
build.retry = False
build.end_time = event_result["end_time"]
build.setResultData(result_data, secret_result_data)
build.build_set.updateAttributes(
pipeline.manager.current_context,
warning_messages=build.build_set.warning_messages + warnings)
build.held = event_result.get("held")
build.result = result
attributes = {
"uuid": build.uuid,
"job": build.job.name,
"buildset_uuid": build.build_set.item.current_build_set.uuid,
"zuul_event_id": build.build_set.item.event.zuul_event_id,
}
tracing.endSavedSpan(build.span_info, attributes=attributes)
self._reportBuildStats(build)
self._cleanupCompletedBuild(build)
try:
self.sql.reportBuildEnd(
build, tenant=pipeline.tenant.name, final=(not build.retry))
except Exception:
log.exception("Error reporting build completion to DB:")
pipeline.manager.onBuildCompleted(build)
def _cleanupCompletedBuild(self, build):
# TODO (felix): Returning the nodes doesn't work in case the buildset
# is not current anymore. Does it harm to not do anything in here in
# this case?
if build.build_set:
# In case the build didn't show up on any executor, the node
# request does still exist, so we have to make sure it is
# removed from ZK.
request_id = build.build_set.getJobNodeRequestID(build.job.name)
if request_id:
self.nodepool.deleteNodeRequest(
request_id, event_id=build.zuul_event_id)
# The build is completed and the nodes were already returned
# by the executor. For consistency, also remove the node
# request from the build set.
build.build_set.removeJobNodeRequestID(build.job.name)
# The test suite expects the build to be removed from the
# internal dict after it's added to the report queue.
self.executor.removeBuild(build)
def _doMergeCompletedEvent(self, event, pipeline):
build_set = self._getBuildSetFromPipeline(event, pipeline)
if not build_set:
return
tracing.endSavedSpan(
event.span_info,
attributes={
"uuid": event.request_uuid,
"buildset_uuid": build_set.uuid,
"zuul_event_id": build_set.item.event.zuul_event_id,
}
)
pipeline.manager.onMergeCompleted(event, build_set)
def _doFilesChangesCompletedEvent(self, event, pipeline):
build_set = self._getBuildSetFromPipeline(event, pipeline)
if not build_set:
return
tracing.endSavedSpan(
event.span_info,
attributes={
"uuid": event.request_uuid,
"buildset_uuid": build_set.uuid,
"zuul_event_id": build_set.item.event.zuul_event_id,
}
)
pipeline.manager.onFilesChangesCompleted(event, build_set)
def _doNodesProvisionedEvent(self, event, pipeline):
request = self.nodepool.zk_nodepool.getNodeRequest(event.request_id)
if not request:
self.log.warning("Unable to find request %s while processing"
"nodes provisioned event %s", request, event)
return
# Look up the buildset to access the local node request object
build_set = self._getBuildSetFromPipeline(event, pipeline)
if not build_set:
self.log.warning("Build set not found while processing"
"nodes provisioned event %s", event)
return
log = get_annotated_logger(self.log, request.event_id)
job = build_set.item.getJob(request.job_name)
if job is None:
log.warning("Item %s does not contain job %s "
"for node request %s",
build_set.item, request.job_name, request)
build_set.removeJobNodeRequestID(request.job_name)
return
# If the request failed, we must directly delete it as the nodes will
# never be accepted.
if request.state == STATE_FAILED:
self.nodepool.deleteNodeRequest(request.id,
event_id=event.request_id)
nodeset = self.nodepool.getNodeSet(request, job.nodeset)
if build_set.getJobNodeSetInfo(request.job_name) is None:
pipeline.manager.onNodesProvisioned(request, nodeset, build_set)
else:
self.log.warning("Duplicate nodes provisioned event: %s",
event)
def cancelJob(self, buildset, job, build=None, final=False,
force=False):
"""Cancel a running build
Set final to true to create a fake build result even if the
job has not run. TODO: explain this better.
Set force to true to forcibly release build resources without
waiting for a result from the executor. Use this when
removing pipelines.
"""
item = buildset.item
log = get_annotated_logger(self.log, item.event)
job_name = job.name
try:
# Cancel node request if needed
req_id = buildset.getJobNodeRequestID(job_name)
if req_id:
req = self.nodepool.zk_nodepool.getNodeRequest(req_id)
if req:
self.nodepool.cancelRequest(req)
buildset.removeJobNodeRequestID(job_name)
# Cancel build if needed
build = build or buildset.getBuild(job_name)
if build:
try:
self.executor.cancel(build)
except Exception:
log.exception(
"Exception while canceling build %s for change %s",
build, item.change)
# In the unlikely case that a build is removed and
# later added back, make sure we clear out the nodeset
# so it gets requested again.
req_info = buildset.getJobNodeSetInfo(job_name)
if req_info:
buildset.removeJobNodeSetInfo(job_name)
if build.result is None:
build.updateAttributes(
buildset.item.pipeline.manager.current_context,
result='CANCELED')
if force:
# Directly delete the build rather than putting a
# CANCELED event in the result event queue since
# the result event queue won't be processed
# anymore once the pipeline is removed.
self.executor.removeBuild(build)
try:
self.sql.reportBuildEnd(
build, build.build_set.item.pipeline.tenant.name,
final=False)
except Exception:
self.log.exception(
"Error reporting build completion to DB:")
else:
if final:
# If final is set make sure that the job is not resurrected
# later by re-requesting nodes.
fakebuild = Build.new(
buildset.item.pipeline.manager.current_context,
job=job, build_set=item.current_build_set,
result='CANCELED')
buildset.addBuild(fakebuild)
finally:
# Release the semaphore in any case
pipeline = buildset.item.pipeline
tenant = pipeline.tenant
event_queue = self.pipeline_result_events[
tenant.name][pipeline.name]
tenant.semaphore_handler.release(event_queue, item, job)
def createZKContext(self, lock, log):
return ZKContext(self.zk_client, lock, self.stop_event, log)
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