799 lines
30 KiB
Python
799 lines
30 KiB
Python
# Copyright 2011 OpenStack, LLC.
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# Copyright 2012 Hewlett-Packard Development Company, L.P.
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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 re
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import select
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import threading
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import time
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from six.moves import queue as Queue
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from six.moves import urllib
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import paramiko
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import logging
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import pprint
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import voluptuous as v
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from zuul.connection import BaseConnection
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from zuul.model import TriggerEvent, Project, Change, Ref, NullChange
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from zuul import exceptions
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# Walk the change dependency tree to find a cycle
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def detect_cycle(change, history=None):
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if history is None:
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history = []
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else:
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history = history[:]
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history.append(change.number)
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for dep in change.needs_changes:
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if dep.number in history:
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raise Exception("Dependency cycle detected: %s in %s" % (
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dep.number, history))
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detect_cycle(dep, history)
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class GerritEventConnector(threading.Thread):
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"""Move events from Gerrit to the scheduler."""
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log = logging.getLogger("zuul.GerritEventConnector")
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delay = 10.0
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def __init__(self, connection):
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super(GerritEventConnector, self).__init__()
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self.daemon = True
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self.connection = connection
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self._stopped = False
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def stop(self):
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self._stopped = True
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self.connection.addEvent(None)
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def _handleEvent(self):
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ts, data = self.connection.getEvent()
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if self._stopped:
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return
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# Gerrit can produce inconsistent data immediately after an
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# event, So ensure that we do not deliver the event to Zuul
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# until at least a certain amount of time has passed. Note
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# that if we receive several events in succession, we will
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# only need to delay for the first event. In essence, Zuul
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# should always be a constant number of seconds behind Gerrit.
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now = time.time()
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time.sleep(max((ts + self.delay) - now, 0.0))
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event = TriggerEvent()
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event.type = data.get('type')
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event.trigger_name = 'gerrit'
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change = data.get('change')
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if change:
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event.project_name = change.get('project')
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event.branch = change.get('branch')
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event.change_number = change.get('number')
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event.change_url = change.get('url')
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patchset = data.get('patchSet')
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if patchset:
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event.patch_number = patchset.get('number')
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event.refspec = patchset.get('ref')
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event.approvals = data.get('approvals', [])
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event.comment = data.get('comment')
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refupdate = data.get('refUpdate')
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if refupdate:
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event.project_name = refupdate.get('project')
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event.ref = refupdate.get('refName')
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event.oldrev = refupdate.get('oldRev')
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event.newrev = refupdate.get('newRev')
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# Map the event types to a field name holding a Gerrit
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# account attribute. See Gerrit stream-event documentation
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# in cmd-stream-events.html
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accountfield_from_type = {
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'patchset-created': 'uploader',
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'draft-published': 'uploader', # Gerrit 2.5/2.6
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'change-abandoned': 'abandoner',
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'change-restored': 'restorer',
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'change-merged': 'submitter',
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'merge-failed': 'submitter', # Gerrit 2.5/2.6
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'comment-added': 'author',
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'ref-updated': 'submitter',
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'reviewer-added': 'reviewer', # Gerrit 2.5/2.6
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}
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try:
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event.account = data.get(accountfield_from_type[event.type])
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except KeyError:
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self.log.warning("Received unrecognized event type '%s' from Gerrit.\
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Can not get account information." % event.type)
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event.account = None
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if event.change_number:
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# TODO(jhesketh): Check if the project exists?
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# and self.connection.sched.getProject(event.project_name):
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# Call _getChange for the side effect of updating the
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# cache. Note that this modifies Change objects outside
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# the main thread.
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# NOTE(jhesketh): Ideally we'd just remove the change from the
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# cache to denote that it needs updating. However the change
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# object is already used by Items and hence BuildSets etc. and
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# we need to update those objects by reference so that they have
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# the correct/new information and also avoid hitting gerrit
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# multiple times.
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self.connection._getChange(event.change_number,
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event.patch_number,
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refresh=True)
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self.connection.sched.addEvent(event)
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def run(self):
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while True:
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if self._stopped:
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return
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try:
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self._handleEvent()
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except:
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self.log.exception("Exception moving Gerrit event:")
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finally:
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self.connection.eventDone()
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class GerritWatcher(threading.Thread):
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log = logging.getLogger("gerrit.GerritWatcher")
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poll_timeout = 500
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def __init__(self, gerrit_connection, username, hostname, port=29418,
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keyfile=None):
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threading.Thread.__init__(self)
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self.username = username
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self.keyfile = keyfile
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self.hostname = hostname
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self.port = port
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self.gerrit_connection = gerrit_connection
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self._stopped = False
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def _read(self, fd):
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l = fd.readline()
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data = json.loads(l)
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self.log.debug("Received data from Gerrit event stream: \n%s" %
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pprint.pformat(data))
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self.gerrit_connection.addEvent(data)
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def _listen(self, stdout, stderr):
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poll = select.poll()
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poll.register(stdout.channel)
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while not self._stopped:
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ret = poll.poll(self.poll_timeout)
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for (fd, event) in ret:
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if fd == stdout.channel.fileno():
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if event == select.POLLIN:
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self._read(stdout)
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else:
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raise Exception("event on ssh connection")
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def _run(self):
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try:
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client = paramiko.SSHClient()
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client.load_system_host_keys()
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client.set_missing_host_key_policy(paramiko.WarningPolicy())
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client.connect(self.hostname,
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username=self.username,
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port=self.port,
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key_filename=self.keyfile)
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stdin, stdout, stderr = client.exec_command("gerrit stream-events")
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self._listen(stdout, stderr)
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if not stdout.channel.exit_status_ready():
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# The stream-event is still running but we are done polling
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# on stdout most likely due to being asked to stop.
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# Try to stop the stream-events command sending Ctrl-C
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stdin.write("\x03")
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time.sleep(.2)
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if not stdout.channel.exit_status_ready():
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# we're still not ready to exit, lets force the channel
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# closed now.
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stdout.channel.close()
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ret = stdout.channel.recv_exit_status()
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self.log.debug("SSH exit status: %s" % ret)
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client.close()
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if ret and ret not in [-1, 130]:
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raise Exception("Gerrit error executing stream-events")
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except:
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self.log.exception("Exception on ssh event stream:")
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time.sleep(5)
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def run(self):
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while not self._stopped:
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self._run()
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def stop(self):
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self.log.debug("Stopping watcher")
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self._stopped = True
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class GerritConnection(BaseConnection):
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driver_name = 'gerrit'
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log = logging.getLogger("connection.gerrit")
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depends_on_re = re.compile(r"^Depends-On: (I[0-9a-f]{40})\s*$",
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re.MULTILINE | re.IGNORECASE)
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replication_timeout = 300
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replication_retry_interval = 5
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def __init__(self, driver, connection_name, connection_config):
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super(GerritConnection, self).__init__(driver, connection_name,
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connection_config)
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if 'server' not in self.connection_config:
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raise Exception('server is required for gerrit connections in '
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'%s' % self.connection_name)
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if 'user' not in self.connection_config:
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raise Exception('user is required for gerrit connections in '
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'%s' % self.connection_name)
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self.user = self.connection_config.get('user')
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self.server = self.connection_config.get('server')
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self.port = int(self.connection_config.get('port', 29418))
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self.keyfile = self.connection_config.get('sshkey', None)
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self.watcher_thread = None
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self.event_queue = Queue.Queue()
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self.client = None
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self.baseurl = self.connection_config.get('baseurl',
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'https://%s' % self.server)
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self._change_cache = {}
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self.projects = {}
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self.gerrit_event_connector = None
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def getProject(self, name):
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if name not in self.projects:
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self.projects[name] = Project(name)
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return self.projects[name]
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def maintainCache(self, relevant):
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# This lets the user supply a list of change objects that are
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# still in use. Anything in our cache that isn't in the supplied
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# list should be safe to remove from the cache.
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remove = []
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for key, change in self._change_cache.items():
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if change not in relevant:
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remove.append(key)
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for key in remove:
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del self._change_cache[key]
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def getChange(self, event, refresh=False):
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if event.change_number:
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change = self._getChange(event.change_number, event.patch_number,
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refresh=refresh)
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elif event.ref:
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project = self.getProject(event.project_name)
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change = Ref(project)
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change.ref = event.ref
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change.oldrev = event.oldrev
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change.newrev = event.newrev
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change.url = self._getGitwebUrl(project, sha=event.newrev)
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else:
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# TODOv3(jeblair): we need to get the project from the event
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change = NullChange(project)
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return change
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def _getChange(self, number, patchset, refresh=False, history=None):
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key = '%s,%s' % (number, patchset)
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change = self._change_cache.get(key)
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if change and not refresh:
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return change
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if not change:
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change = Change(None)
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change.number = number
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change.patchset = patchset
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key = '%s,%s' % (change.number, change.patchset)
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self._change_cache[key] = change
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try:
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self._updateChange(change, history)
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except Exception:
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if key in self._change_cache:
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del self._change_cache[key]
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raise
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return change
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def _getDependsOnFromCommit(self, message, change):
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records = []
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seen = set()
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for match in self.depends_on_re.findall(message):
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if match in seen:
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self.log.debug("Ignoring duplicate Depends-On: %s" %
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(match,))
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continue
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seen.add(match)
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query = "change:%s" % (match,)
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self.log.debug("Updating %s: Running query %s "
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"to find needed changes" %
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(change, query,))
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records.extend(self.simpleQuery(query))
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return records
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def _getNeededByFromCommit(self, change_id, change):
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records = []
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seen = set()
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query = 'message:%s' % change_id
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self.log.debug("Updating %s: Running query %s "
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"to find changes needed-by" %
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(change, query,))
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results = self.simpleQuery(query)
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for result in results:
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for match in self.depends_on_re.findall(
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result['commitMessage']):
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if match != change_id:
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continue
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key = (result['number'], result['currentPatchSet']['number'])
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if key in seen:
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continue
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self.log.debug("Updating %s: Found change %s,%s "
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"needs %s from commit" %
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(change, key[0], key[1], change_id))
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seen.add(key)
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records.append(result)
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return records
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def _updateChange(self, change, history=None):
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self.log.info("Updating %s" % (change,))
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data = self.query(change.number)
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change._data = data
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if change.patchset is None:
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change.patchset = data['currentPatchSet']['number']
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if 'project' not in data:
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raise exceptions.ChangeNotFound(change.number, change.patchset)
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change.project = self.getProject(data['project'])
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change.branch = data['branch']
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change.url = data['url']
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max_ps = 0
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files = []
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for ps in data['patchSets']:
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if ps['number'] == change.patchset:
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change.refspec = ps['ref']
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for f in ps.get('files', []):
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files.append(f['file'])
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if int(ps['number']) > int(max_ps):
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max_ps = ps['number']
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if max_ps == change.patchset:
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change.is_current_patchset = True
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else:
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change.is_current_patchset = False
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change.files = files
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change.is_merged = self._isMerged(change)
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change.approvals = data['currentPatchSet'].get('approvals', [])
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change.open = data['open']
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change.status = data['status']
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change.owner = data['owner']
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if change.is_merged:
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# This change is merged, so we don't need to look any further
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# for dependencies.
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self.log.debug("Updating %s: change is merged" % (change,))
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return change
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if history is None:
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history = []
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else:
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history = history[:]
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history.append(change.number)
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needs_changes = []
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if 'dependsOn' in data:
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parts = data['dependsOn'][0]['ref'].split('/')
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dep_num, dep_ps = parts[3], parts[4]
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if dep_num in history:
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raise Exception("Dependency cycle detected: %s in %s" % (
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dep_num, history))
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self.log.debug("Updating %s: Getting git-dependent change %s,%s" %
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(change, dep_num, dep_ps))
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dep = self._getChange(dep_num, dep_ps, history=history)
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# Because we are not forcing a refresh in _getChange, it
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# may return without executing this code, so if we are
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# updating our change to add ourselves to a dependency
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# cycle, we won't detect it. By explicitly performing a
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# walk of the dependency tree, we will.
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detect_cycle(dep, history)
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if (not dep.is_merged) and dep not in needs_changes:
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needs_changes.append(dep)
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for record in self._getDependsOnFromCommit(data['commitMessage'],
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change):
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dep_num = record['number']
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dep_ps = record['currentPatchSet']['number']
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if dep_num in history:
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raise Exception("Dependency cycle detected: %s in %s" % (
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dep_num, history))
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self.log.debug("Updating %s: Getting commit-dependent "
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"change %s,%s" %
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(change, dep_num, dep_ps))
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dep = self._getChange(dep_num, dep_ps, history=history)
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# Because we are not forcing a refresh in _getChange, it
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# may return without executing this code, so if we are
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# updating our change to add ourselves to a dependency
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# cycle, we won't detect it. By explicitly performing a
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# walk of the dependency tree, we will.
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detect_cycle(dep, history)
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if (not dep.is_merged) and dep not in needs_changes:
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needs_changes.append(dep)
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change.needs_changes = needs_changes
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needed_by_changes = []
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if 'neededBy' in data:
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for needed in data['neededBy']:
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parts = needed['ref'].split('/')
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dep_num, dep_ps = parts[3], parts[4]
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self.log.debug("Updating %s: Getting git-needed change %s,%s" %
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(change, dep_num, dep_ps))
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dep = self._getChange(dep_num, dep_ps)
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if (not dep.is_merged) and dep.is_current_patchset:
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needed_by_changes.append(dep)
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for record in self._getNeededByFromCommit(data['id'], change):
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dep_num = record['number']
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dep_ps = record['currentPatchSet']['number']
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self.log.debug("Updating %s: Getting commit-needed change %s,%s" %
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(change, dep_num, dep_ps))
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# Because a commit needed-by may be a cross-repo
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# dependency, cause that change to refresh so that it will
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# reference the latest patchset of its Depends-On (this
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# change).
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dep = self._getChange(dep_num, dep_ps, refresh=True)
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if (not dep.is_merged) and dep.is_current_patchset:
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needed_by_changes.append(dep)
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change.needed_by_changes = needed_by_changes
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return change
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def isMerged(self, change, head=None):
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self.log.debug("Checking if change %s is merged" % change)
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if not change.number:
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self.log.debug("Change has no number; considering it merged")
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# Good question. It's probably ref-updated, which, ah,
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# means it's merged.
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return True
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data = self.query(change.number)
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change._data = data
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change.is_merged = self._isMerged(change)
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if change.is_merged:
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self.log.debug("Change %s is merged" % (change,))
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else:
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self.log.debug("Change %s is not merged" % (change,))
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if not head:
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return change.is_merged
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if not change.is_merged:
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return False
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ref = 'refs/heads/' + change.branch
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self.log.debug("Waiting for %s to appear in git repo" % (change))
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if self._waitForRefSha(change.project, ref, change._ref_sha):
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self.log.debug("Change %s is in the git repo" %
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(change))
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return True
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self.log.debug("Change %s did not appear in the git repo" %
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(change))
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return False
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def _isMerged(self, change):
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data = change._data
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if not data:
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return False
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status = data.get('status')
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if not status:
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return False
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if status == 'MERGED':
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return True
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return False
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|
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def _waitForRefSha(self, project, ref, old_sha=''):
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|
# Wait for the ref to show up in the repo
|
|
start = time.time()
|
|
while time.time() - start < self.replication_timeout:
|
|
sha = self.getRefSha(project.name, ref)
|
|
if old_sha != sha:
|
|
return True
|
|
time.sleep(self.replication_retry_interval)
|
|
return False
|
|
|
|
def getRefSha(self, project, ref):
|
|
refs = {}
|
|
try:
|
|
refs = self.getInfoRefs(project)
|
|
except:
|
|
self.log.exception("Exception looking for ref %s" %
|
|
ref)
|
|
sha = refs.get(ref, '')
|
|
return sha
|
|
|
|
def canMerge(self, change, allow_needs):
|
|
if not change.number:
|
|
self.log.debug("Change has no number; considering it merged")
|
|
# Good question. It's probably ref-updated, which, ah,
|
|
# means it's merged.
|
|
return True
|
|
data = change._data
|
|
if not data:
|
|
return False
|
|
if 'submitRecords' not in data:
|
|
return False
|
|
try:
|
|
for sr in data['submitRecords']:
|
|
if sr['status'] == 'OK':
|
|
return True
|
|
elif sr['status'] == 'NOT_READY':
|
|
for label in sr['labels']:
|
|
if label['status'] in ['OK', 'MAY']:
|
|
continue
|
|
elif label['status'] in ['NEED', 'REJECT']:
|
|
# It may be our own rejection, so we ignore
|
|
if label['label'].lower() not in allow_needs:
|
|
return False
|
|
continue
|
|
else:
|
|
# IMPOSSIBLE
|
|
return False
|
|
else:
|
|
# CLOSED, RULE_ERROR
|
|
return False
|
|
except:
|
|
self.log.exception("Exception determining whether change"
|
|
"%s can merge:" % change)
|
|
return False
|
|
return True
|
|
|
|
def getProjectOpenChanges(self, project):
|
|
# This is a best-effort function in case Gerrit is unable to return
|
|
# a particular change. It happens.
|
|
query = "project:%s status:open" % (project.name,)
|
|
self.log.debug("Running query %s to get project open changes" %
|
|
(query,))
|
|
data = self.simpleQuery(query)
|
|
changes = []
|
|
for record in data:
|
|
try:
|
|
changes.append(
|
|
self._getChange(record['number'],
|
|
record['currentPatchSet']['number']))
|
|
except Exception:
|
|
self.log.exception("Unable to query change %s" %
|
|
(record.get('number'),))
|
|
return changes
|
|
|
|
def getProjectBranches(self, project):
|
|
refs = self.getInfoRefs(project)
|
|
heads = [str(k[len('refs/heads/'):]) for k in refs.keys()
|
|
if k.startswith('refs/heads/')]
|
|
return heads
|
|
|
|
def addEvent(self, data):
|
|
return self.event_queue.put((time.time(), data))
|
|
|
|
def getEvent(self):
|
|
return self.event_queue.get()
|
|
|
|
def eventDone(self):
|
|
self.event_queue.task_done()
|
|
|
|
def review(self, project, change, message, action={}):
|
|
cmd = 'gerrit review --project %s' % project
|
|
if message:
|
|
cmd += ' --message "%s"' % message
|
|
for key, val in action.items():
|
|
if val is True:
|
|
cmd += ' --%s' % key
|
|
else:
|
|
cmd += ' --%s %s' % (key, val)
|
|
cmd += ' %s' % change
|
|
out, err = self._ssh(cmd)
|
|
return err
|
|
|
|
def query(self, query):
|
|
args = '--all-approvals --comments --commit-message'
|
|
args += ' --current-patch-set --dependencies --files'
|
|
args += ' --patch-sets --submit-records'
|
|
cmd = 'gerrit query --format json %s %s' % (
|
|
args, query)
|
|
out, err = self._ssh(cmd)
|
|
if not out:
|
|
return False
|
|
lines = out.split('\n')
|
|
if not lines:
|
|
return False
|
|
data = json.loads(lines[0])
|
|
if not data:
|
|
return False
|
|
self.log.debug("Received data from Gerrit query: \n%s" %
|
|
(pprint.pformat(data)))
|
|
return data
|
|
|
|
def simpleQuery(self, query):
|
|
def _query_chunk(query):
|
|
args = '--commit-message --current-patch-set'
|
|
|
|
cmd = 'gerrit query --format json %s %s' % (
|
|
args, query)
|
|
out, err = self._ssh(cmd)
|
|
if not out:
|
|
return False
|
|
lines = out.split('\n')
|
|
if not lines:
|
|
return False
|
|
|
|
# filter out blank lines
|
|
data = [json.loads(line) for line in lines
|
|
if line.startswith('{')]
|
|
|
|
# check last entry for more changes
|
|
more_changes = None
|
|
if 'moreChanges' in data[-1]:
|
|
more_changes = data[-1]['moreChanges']
|
|
|
|
# we have to remove the statistics line
|
|
del data[-1]
|
|
|
|
if not data:
|
|
return False, more_changes
|
|
self.log.debug("Received data from Gerrit query: \n%s" %
|
|
(pprint.pformat(data)))
|
|
return data, more_changes
|
|
|
|
# gerrit returns 500 results by default, so implement paging
|
|
# for large projects like nova
|
|
alldata = []
|
|
chunk, more_changes = _query_chunk(query)
|
|
while(chunk):
|
|
alldata.extend(chunk)
|
|
if more_changes is None:
|
|
# continue sortKey based (before Gerrit 2.9)
|
|
resume = "resume_sortkey:'%s'" % chunk[-1]["sortKey"]
|
|
elif more_changes:
|
|
# continue moreChanges based (since Gerrit 2.9)
|
|
resume = "-S %d" % len(alldata)
|
|
else:
|
|
# no more changes
|
|
break
|
|
|
|
chunk, more_changes = _query_chunk("%s %s" % (query, resume))
|
|
return alldata
|
|
|
|
def _open(self):
|
|
client = paramiko.SSHClient()
|
|
client.load_system_host_keys()
|
|
client.set_missing_host_key_policy(paramiko.WarningPolicy())
|
|
client.connect(self.server,
|
|
username=self.user,
|
|
port=self.port,
|
|
key_filename=self.keyfile)
|
|
self.client = client
|
|
|
|
def _ssh(self, command, stdin_data=None):
|
|
if not self.client:
|
|
self._open()
|
|
|
|
try:
|
|
self.log.debug("SSH command:\n%s" % command)
|
|
stdin, stdout, stderr = self.client.exec_command(command)
|
|
except:
|
|
self._open()
|
|
stdin, stdout, stderr = self.client.exec_command(command)
|
|
|
|
if stdin_data:
|
|
stdin.write(stdin_data)
|
|
|
|
out = stdout.read()
|
|
self.log.debug("SSH received stdout:\n%s" % out)
|
|
|
|
ret = stdout.channel.recv_exit_status()
|
|
self.log.debug("SSH exit status: %s" % ret)
|
|
|
|
err = stderr.read()
|
|
self.log.debug("SSH received stderr:\n%s" % err)
|
|
if ret:
|
|
raise Exception("Gerrit error executing %s" % command)
|
|
return (out, err)
|
|
|
|
def getInfoRefs(self, project):
|
|
url = "%s/p/%s/info/refs?service=git-upload-pack" % (
|
|
self.baseurl, project)
|
|
try:
|
|
data = urllib.request.urlopen(url).read()
|
|
except:
|
|
self.log.error("Cannot get references from %s" % url)
|
|
raise # keeps urllib error informations
|
|
ret = {}
|
|
read_headers = False
|
|
read_advertisement = False
|
|
if data[4] != '#':
|
|
raise Exception("Gerrit repository does not support "
|
|
"git-upload-pack")
|
|
i = 0
|
|
while i < len(data):
|
|
if len(data) - i < 4:
|
|
raise Exception("Invalid length in info/refs")
|
|
plen = int(data[i:i + 4], 16)
|
|
i += 4
|
|
# It's the length of the packet, including the 4 bytes of the
|
|
# length itself, unless it's null, in which case the length is
|
|
# not included.
|
|
if plen > 0:
|
|
plen -= 4
|
|
if len(data) - i < plen:
|
|
raise Exception("Invalid data in info/refs")
|
|
line = data[i:i + plen]
|
|
i += plen
|
|
if not read_headers:
|
|
if plen == 0:
|
|
read_headers = True
|
|
continue
|
|
if not read_advertisement:
|
|
read_advertisement = True
|
|
continue
|
|
if plen == 0:
|
|
# The terminating null
|
|
continue
|
|
line = line.strip()
|
|
revision, ref = line.split()
|
|
ret[ref] = revision
|
|
return ret
|
|
|
|
def getGitUrl(self, project):
|
|
url = 'ssh://%s@%s:%s/%s' % (self.user, self.server, self.port,
|
|
project.name)
|
|
return url
|
|
|
|
def getGitwebUrl(self, project, sha=None):
|
|
url = '%s/gitweb?p=%s.git' % (self.baseurl, project)
|
|
if sha:
|
|
url += ';a=commitdiff;h=' + sha
|
|
return url
|
|
|
|
def onLoad(self):
|
|
self.log.debug("Starting Gerrit Connection/Watchers")
|
|
self._start_watcher_thread()
|
|
self._start_event_connector()
|
|
|
|
def onStop(self):
|
|
self.log.debug("Stopping Gerrit Connection/Watchers")
|
|
self._stop_watcher_thread()
|
|
self._stop_event_connector()
|
|
|
|
def _stop_watcher_thread(self):
|
|
if self.watcher_thread:
|
|
self.watcher_thread.stop()
|
|
self.watcher_thread.join()
|
|
|
|
def _start_watcher_thread(self):
|
|
self.watcher_thread = GerritWatcher(
|
|
self,
|
|
self.user,
|
|
self.server,
|
|
self.port,
|
|
keyfile=self.keyfile)
|
|
self.watcher_thread.start()
|
|
|
|
def _stop_event_connector(self):
|
|
if self.gerrit_event_connector:
|
|
self.gerrit_event_connector.stop()
|
|
self.gerrit_event_connector.join()
|
|
|
|
def _start_event_connector(self):
|
|
self.gerrit_event_connector = GerritEventConnector(self)
|
|
self.gerrit_event_connector.start()
|
|
|
|
|
|
def getSchema():
|
|
gerrit_connection = v.Any(str, v.Schema({}, extra=True))
|
|
return gerrit_connection
|