62 lines
2.8 KiB
Python
62 lines
2.8 KiB
Python
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#
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# Copyright (C) 2020 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from pyanaconda.modules.common.constants.services import RHSM
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from pyanaconda.core.constants import RHSM_SERVICE_TIMEOUT
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from pyanaconda.anaconda_loggers import get_module_logger
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from dasbus.client.observer import DBusObserver, DBusObserverError
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log = get_module_logger(__name__)
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class RHSMObserver(DBusObserver):
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"""Observer of the systemd unit backed RHSM DBus service."""
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def __init__(self, startup_check_method, timeout=RHSM_SERVICE_TIMEOUT):
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"""Creates a RHSM service observer.
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The observer will wait (up to a timeout) for the task starting the RHSM service
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to finish and then provide access to the corresponding RHSM DBus API.
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The waiting is only expected to happen at Anaconda startup, once the RHSM
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startup task has finished running no further waiting is expected.
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:param startup_check_method: a blocking method that waits for RHSM
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startup to finish up to a given timeout
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and then returns a boolean value corresponding
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to True if startup was successful or False
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otherwise
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:param float timeout: how long to wait for RHSM service to start in seconds
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"""
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super().__init__(RHSM.message_bus, RHSM.service_name)
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self._startup_check_method = startup_check_method
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self._timeout = timeout
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def get_proxy(self, object_identifier):
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"""Returns a proxy of the given RHSM object identifier.
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:param object_identifier: RHSM DBus API object identifier
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:type object_identifier: DBusObjectIdentifier instance
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:raises: DBusObserverError if the given proxy can't be returned
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"""
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# first check if the DBus API seems to be up
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if not self.is_service_available and not self._startup_check_method(self._timeout):
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raise DBusObserverError("The RHSM DBus API is not available.")
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# get a proxy of a specific DBus interface
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return RHSM.get_proxy(object_identifier, interface_name=object_identifier)
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