458 lines
16 KiB
Python
458 lines
16 KiB
Python
# Copyright 2014 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import json
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import logging
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import os
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import socket
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import sys
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import threading
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import time
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from abc import ABCMeta
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from configparser import ConfigParser
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from zuul.lib import commandsocket
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from zuul.lib.config import get_default
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from zuul.lib.logutil import get_annotated_logger
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from zuul.merger import merger
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from zuul.merger.merger import nullcontext
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from zuul.model import (
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FilesChangesCompletedEvent, MergeCompletedEvent, MergeRequest
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)
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from zuul.zk import ZooKeeperClient
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from zuul.zk.components import MergerComponent
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from zuul.zk.event_queues import PipelineResultEventQueue
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from zuul.zk.merger import MergerApi
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COMMANDS = ['stop', 'pause', 'unpause']
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class BaseRepoLocks(metaclass=ABCMeta):
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def getRepoLock(self, connection_name, project_name):
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return nullcontext()
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class RepoLocks(BaseRepoLocks):
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def __init__(self):
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self.locks = {}
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def getRepoLock(self, connection_name, project_name):
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key = '%s:%s' % (connection_name, project_name)
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self.locks.setdefault(key, threading.Lock())
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return self.locks[key]
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class BaseMergeServer(metaclass=ABCMeta):
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log = logging.getLogger("zuul.BaseMergeServer")
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_repo_locks_class = BaseRepoLocks
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def __init__(
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self,
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config: ConfigParser,
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component: str,
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connections,
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):
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self.connections = connections
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self._merger_running = False
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self._merger_paused = False
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self.merge_email = get_default(config, 'merger', 'git_user_email',
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'zuul.merger.default@example.com')
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self.merge_name = get_default(config, 'merger', 'git_user_name',
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'Zuul Merger Default')
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self.merge_speed_limit = get_default(
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config, 'merger', 'git_http_low_speed_limit', '1000')
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self.merge_speed_time = get_default(
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config, 'merger', 'git_http_low_speed_time', '30')
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self.git_timeout = get_default(config, 'merger', 'git_timeout', 300)
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self.merge_root = get_default(config, component, 'git_dir',
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'/var/lib/zuul/{}-git'.format(component))
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self.config = config
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self.zk_client = ZooKeeperClient.fromConfig(self.config)
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self.zk_client.connect()
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self.result_events = PipelineResultEventQueue.createRegistry(
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self.zk_client
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)
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self.merger_thread = threading.Thread(
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target=self.runMerger,
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name="Merger",
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)
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self.merger_loop_wake_event = threading.Event()
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self.merger_api = MergerApi(
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self.zk_client,
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merge_request_callback=self.merger_loop_wake_event.set,
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)
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# This merger and its git repos are used to maintain
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# up-to-date copies of all the repos that are used by jobs, as
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# well as to support the merger:cat functon to supply
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# configuration information to Zuul when it starts.
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self.merger = self._getMerger(self.merge_root, None,
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execution_context=False)
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# Repo locking is needed on the executor
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self.repo_locks = self._repo_locks_class()
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def _getMerger(self, root, cache_root, logger=None,
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execution_context=True, scheme=None,
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cache_scheme=None):
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return merger.Merger(
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root,
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self.connections,
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self.zk_client,
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self.merge_email,
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self.merge_name,
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self.merge_speed_limit,
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self.merge_speed_time,
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cache_root,
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logger,
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execution_context=execution_context,
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git_timeout=self.git_timeout,
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scheme=scheme,
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cache_scheme=cache_scheme,
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)
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def _repoLock(self, connection_name, project_name):
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# The merger does not need locking so return a null lock.
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return nullcontext()
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def _update(self, connection_name, project_name, zuul_event_id=None):
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# The executor overrides _update so it can do the update
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# asynchronously.
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self.merger.updateRepo(connection_name, project_name,
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zuul_event_id=zuul_event_id)
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def start(self):
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self.log.debug('Starting merger')
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self.log.debug('Cleaning any stale git index.lock files')
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for (dirpath, dirnames, filenames) in os.walk(self.merge_root):
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if '.git' in dirnames:
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# Only recurse into .git dirs
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dirnames.clear()
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dirnames.append('.git')
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elif dirpath.endswith('/.git'):
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# Recurse no further
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dirnames.clear()
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if 'index.lock' in filenames:
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fp = os.path.join(dirpath, 'index.lock')
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try:
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os.unlink(fp)
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self.log.debug('Removed stale git lock: %s' % fp)
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except Exception:
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self.log.exception(
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'Unable to remove stale git lock: '
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'%s this may result in failed merges' % fp)
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self._merger_running = True
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self.merger_thread.start()
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def stop(self):
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self.log.debug('Stopping merger')
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self._merger_running = False
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self.merger_loop_wake_event.set()
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self.zk_client.disconnect()
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def join(self):
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self.merger_loop_wake_event.set()
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self.merger_thread.join()
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def pause(self):
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self.log.debug('Pausing merger')
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self._merger_paused = True
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def unpause(self):
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self.log.debug('Resuming merger')
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self._merger_paused = False
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self.merger_loop_wake_event.set()
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def runMerger(self):
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while self._merger_running:
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self.merger_loop_wake_event.wait()
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self.merger_loop_wake_event.clear()
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if self._merger_paused:
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continue
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try:
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for merge_request in self.merger_api.next():
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if not self._merger_running:
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break
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try:
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self._runMergeJob(merge_request)
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except Exception:
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log = get_annotated_logger(
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self.log, merge_request.event_id
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)
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log.exception("Exception while performing merge")
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self.completeMergeJob(merge_request, None)
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except Exception:
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self.log.exception("Error in merge thread:")
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time.sleep(5)
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def _runMergeJob(self, merge_request):
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if not self.merger_api.lock(merge_request, blocking=False):
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return
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merge_request.state = MergeRequest.RUNNING
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params = self.merger_api.getParams(merge_request)
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self.merger_api.clearParams(merge_request)
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# Directly update the merge request in ZooKeeper, so we don't loop over
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# and try to lock it again and again.
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self.merger_api.update(merge_request)
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self.log.debug("Next executed merge job: %s", merge_request)
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result = None
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try:
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result = self.executeMergeJob(merge_request, params)
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except Exception:
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self.log.exception("Error running merge job:")
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finally:
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try:
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self.completeMergeJob(merge_request, result)
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except Exception:
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self.log.exception("Error completing merge job:")
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def executeMergeJob(self, merge_request, params):
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result = None
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if merge_request.job_type == MergeRequest.MERGE:
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result = self.merge(merge_request, params)
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elif merge_request.job_type == MergeRequest.CAT:
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result = self.cat(merge_request, params)
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elif merge_request.job_type == MergeRequest.REF_STATE:
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result = self.refstate(merge_request, params)
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elif merge_request.job_type == MergeRequest.FILES_CHANGES:
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result = self.fileschanges(merge_request, params)
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return result
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def cat(self, merge_request, args):
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self.log.debug("Got cat job: %s", merge_request.uuid)
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connection_name = args['connection']
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project_name = args['project']
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lock = self.repo_locks.getRepoLock(connection_name, project_name)
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try:
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self._update(connection_name, project_name)
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with lock:
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files = self.merger.getFiles(connection_name, project_name,
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args['branch'], args['files'],
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args.get('dirs'))
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except Exception:
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result = dict(update=False)
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else:
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result = dict(updated=True, files=files)
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return result
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def merge(self, merge_request, args):
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self.log.debug("Got merge job: %s", merge_request.uuid)
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zuul_event_id = merge_request.event_id
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for item in args['items']:
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self._update(item['connection'], item['project'])
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ret = self.merger.mergeChanges(
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args['items'], args.get('files'),
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args.get('dirs', []),
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args.get('repo_state'),
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branches=args.get('branches'),
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repo_locks=self.repo_locks,
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zuul_event_id=zuul_event_id)
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result = dict(merged=(ret is not None))
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if ret is None:
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result['commit'] = result['files'] = result['repo_state'] = None
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else:
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(result['commit'], result['files'], result['repo_state'],
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recent, orig_commit) = ret
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result['zuul_event_id'] = zuul_event_id
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return result
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def refstate(self, merge_request, args):
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self.log.debug("Got refstate job: %s", merge_request.uuid)
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zuul_event_id = merge_request.event_id
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success, repo_state, item_in_branches = \
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self.merger.getRepoState(
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args['items'], self.repo_locks, branches=args.get('branches'))
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result = dict(updated=success,
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repo_state=repo_state,
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item_in_branches=item_in_branches)
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result['zuul_event_id'] = zuul_event_id
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return result
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def fileschanges(self, merge_request, args):
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self.log.debug("Got fileschanges job: %s", merge_request.uuid)
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zuul_event_id = merge_request.event_id
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connection_name = args['connection']
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project_name = args['project']
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lock = self.repo_locks.getRepoLock(connection_name, project_name)
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try:
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self._update(connection_name, project_name,
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zuul_event_id=zuul_event_id)
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with lock:
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files = self.merger.getFilesChanges(
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connection_name, project_name,
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args['branch'], args['tosha'],
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zuul_event_id=zuul_event_id)
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except Exception:
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result = dict(update=False)
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else:
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result = dict(updated=True, files=files)
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result['zuul_event_id'] = zuul_event_id
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return result
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def completeMergeJob(self, merge_request, result):
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log = get_annotated_logger(self.log, merge_request.event_id)
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if result is not None:
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payload = json.dumps(result)
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self.log.debug("Completed %s job %s: payload size: %s",
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merge_request.job_type, merge_request.uuid,
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sys.getsizeof(payload))
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merged = result.get("merged", False)
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updated = result.get("updated", False)
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commit = result.get("commit")
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repo_state = result.get("repo_state", {})
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item_in_branches = result.get("item_in_branches", [])
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files = result.get("files", {})
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log.info(
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"Merge %s complete, merged: %s, updated: %s, commit: %s, "
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"branches: %s",
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merge_request,
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merged,
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updated,
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commit,
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item_in_branches,
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)
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# Provide a result either via a result future or a result event
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if merge_request.result_path:
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log.debug(
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"Providing synchronous result via future for %s",
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merge_request,
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)
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self.merger_api.reportResult(merge_request, result)
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elif merge_request.build_set_uuid:
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log.debug(
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"Providing asynchronous result via result event for %s",
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merge_request,
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)
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if merge_request.job_type == MergeRequest.FILES_CHANGES:
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event = FilesChangesCompletedEvent(
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merge_request.build_set_uuid, files
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)
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else:
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event = MergeCompletedEvent(
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merge_request.build_set_uuid,
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merged,
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updated,
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commit,
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files,
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repo_state,
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item_in_branches,
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)
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tenant_name = merge_request.tenant_name
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pipeline_name = merge_request.pipeline_name
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self.result_events[tenant_name][pipeline_name].put(event)
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# Set the merge request to completed, unlock and delete it. Although
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# the state update is mainly for consistency reasons, it might come in
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# handy in case the deletion or unlocking failes. Thus, we know that
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# the merge request was already processed and we have a result in the
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# result queue.
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merge_request.state = MergeRequest.COMPLETED
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self.merger_api.update(merge_request)
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self.merger_api.unlock(merge_request)
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# TODO (felix): If we want to optimize ZK requests, we could only call
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# the remove() here.
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self.merger_api.remove(merge_request)
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class MergeServer(BaseMergeServer):
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log = logging.getLogger("zuul.MergeServer")
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def __init__(
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self,
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config: ConfigParser,
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connections,
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):
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super().__init__(config, 'merger', connections)
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self.hostname = socket.getfqdn()
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self.component_info = MergerComponent(self.zk_client, self.hostname)
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self.component_info.register()
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self.command_map = dict(
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stop=self.stop,
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pause=self.pause,
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unpause=self.unpause,
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)
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command_socket = get_default(
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self.config, 'merger', 'command_socket',
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'/var/lib/zuul/merger.socket')
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self.command_socket = commandsocket.CommandSocket(command_socket)
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self._command_running = False
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def start(self):
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super().start()
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self._command_running = True
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self.log.debug("Starting command processor")
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self.command_socket.start()
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self.command_thread = threading.Thread(
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target=self.runCommand, name='command')
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self.command_thread.daemon = True
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self.command_thread.start()
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self.component_info.state = self.component_info.RUNNING
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def stop(self):
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self.log.debug("Stopping")
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self.component_info.state = self.component_info.STOPPED
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super().stop()
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self._command_running = False
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self.command_socket.stop()
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self.log.debug("Stopped")
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def join(self):
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super().join()
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def pause(self):
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self.log.debug('Pausing')
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self.component_info.state = self.component_info.PAUSED
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super().pause()
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def unpause(self):
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self.log.debug('Resuming')
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super().unpause()
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self.component_info.state = self.component_info.RUNNING
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def runCommand(self):
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while self._command_running:
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try:
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command = self.command_socket.get().decode('utf8')
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if command != '_stop':
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self.command_map[command]()
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except Exception:
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self.log.exception("Exception while processing command")
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