def __init__(self):
""" Provides some convenient variables for commands.
Also sets requires_* parameters for some sets of commands.
All of the command objects are singletons (or Borg).
"""
self.dbf = DbFactory()
self.config = Config()
self.az = AuthorizationBroker()
self.formatter = ResponseFormatter()
self.catalog = StatusCatalog()
# Force the instance to have local copies of the class defaults...
# This allows resources.py to modify instances without worrying
# about inheritance issues (classes sharing required or optional
# parameters).
self.required_parameters = self.required_parameters[:]
self.optional_parameters = self.optional_parameters[:]
# Parameter checks are filled in automatically based on input.xml. This
# lets us do some rudimentary checks before the actual command is
# invoked.
self.parameter_checks = {}
# The parameter types are filled in automatically based on input.xml.
self.parameter_types = {}
# This is the pivot of the above, filled in at the same time. It is a
# dictionary of type names to lists of parameters.
self.parameters_by_type = {}
self.action = self.__module__
package_prefix = "aquilon.worker.commands."
if self.action.startswith(package_prefix):
self.action = self.action[len(package_prefix):]
# self.command is set correctly in resources.py after parsing input.xml
self.command = self.action
# The readonly and format flags are done here for convenience
# and simplicity. They could be overridden by the __init__
# method of any show/search/cat commands that do not want these
# defaults. Some 'one-off' commands (like ping and status)
# just set the variables themselves.
if self.action.startswith("show") or self.action.startswith("search"):
self.requires_readonly = True
self.requires_format = True
if self.action.startswith("cat"):
self.requires_format = True
self.requires_readonly = True
self._is_lock_free = True
if not self.requires_readonly \
and self.config.get('broker', 'mode') == 'readonly':
self.badmode = 'readonly'
else:
self.badmode = False
self._update_render(self.render)
if not self.defer_to_thread:
if self.requires_azcheck or self.requires_transaction:
self.defer_to_thread = True
log.msg("Forcing defer_to_thread to True because of "
"required authorization or transaction for %s" %
self.command)
# Not sure how to handle formatting with deferred...
self.requires_format = False
