def _GetSafeServerInstance(self):
'''Returns a ServerInstance with a host file system at a safe revision,
meaning the last revision that the current running version of the server
existed.
'''
delegate = self._delegate
# IMPORTANT: Get a ServerInstance pinned to the most recent revision, not
# HEAD. These cron jobs take a while and run very frequently such that
# there is usually one running at any given time, and eventually a file
# that we're dealing with will change underneath it, putting the server in
# an undefined state.
server_instance_near_head = self._CreateServerInstance(
self._GetMostRecentRevision())
app_yaml_handler = AppYamlHelper(
server_instance_near_head.object_store_creator,
server_instance_near_head.host_file_system_provider)
if app_yaml_handler.IsUpToDate(delegate.GetAppVersion()):
return server_instance_near_head
# The version in app.yaml is greater than the currently running app's.
# The safe version is the one before it changed.
safe_revision = app_yaml_handler.GetFirstRevisionGreaterThan(
delegate.GetAppVersion()) - 1
_cronlog.info('app version %s is out of date, safe is %s',
delegate.GetAppVersion(), safe_revision)
return self._CreateServerInstance(safe_revision)
def _GetSafeServerInstance(self):
'''Returns a ServerInstance with a host file system at a safe revision,
meaning the last revision that the current running version of the server
existed.
'''
delegate = self._delegate
server_instance_at_head = self._CreateServerInstance(None)
app_yaml_handler = AppYamlHelper(
svn_constants.APP_YAML_PATH,
server_instance_at_head.host_file_system,
server_instance_at_head.object_store_creator,
server_instance_at_head.host_file_system_creator)
if app_yaml_handler.IsUpToDate(delegate.GetAppVersion()):
# TODO(kalman): return a new ServerInstance at an explicit revision in
# case the HEAD version changes underneath us.
return server_instance_at_head
# The version in app.yaml is greater than the currently running app's.
# The safe version is the one before it changed.
safe_revision = app_yaml_handler.GetFirstRevisionGreaterThan(
delegate.GetAppVersion()) - 1
logging.info('cron: app version %s is out of date, safe is %s' %
(delegate.GetAppVersion(), safe_revision))
return self._CreateServerInstance(safe_revision)
def _GetSafeServerInstance(self):
'''Returns a ServerInstance with a host file system at a safe revision,
meaning the last revision that the current running version of the server
existed.
'''
channel = self._channel
delegate = self._delegate
server_instance_at_head = self._CreateServerInstance(channel, None)
get_branch_for_channel = self._GetBranchForChannel
class AppYamlHelperDelegate(AppYamlHelper.Delegate):
def GetHostFileSystemForRevision(self, revision):
return delegate.CreateHostFileSystemForBranchAndRevision(
get_branch_for_channel(channel),
revision)
app_yaml_handler = AppYamlHelper(
svn_constants.APP_YAML_PATH,
server_instance_at_head.host_file_system,
AppYamlHelperDelegate(),
server_instance_at_head.object_store_creator)
if app_yaml_handler.IsUpToDate(delegate.GetAppVersion()):
# TODO(kalman): return a new ServerInstance at an explicit revision in
# case the HEAD version changes underneath us.
return server_instance_at_head
# The version in app.yaml is greater than the currently running app's.
# The safe version is the one before it changed.
safe_revision = app_yaml_handler.GetFirstRevisionGreaterThan(
delegate.GetAppVersion()) - 1
logging.info('cron/%s: app version %s is out of date, safe is %s' % (
channel, delegate.GetAppVersion(), safe_revision))
return self._CreateServerInstance(channel, safe_revision)
