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# Contributors Listed Below - COPYRIGHT 2016
# [+] International Business Machines Corp.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
import sys
import dbus
import dbus.mainloop.glib
# TODO: openbmc/openbmc#2994 remove python 2 support
try: # python 2
import gobject
except ImportError: # python 3
from gi.repository import GObject as gobject
import obmc.mapper
class Wait(object):
def __init__(self, bus, waitlist, *a, **kw):
self.bus = bus
self.waitlist = dict(list(zip(waitlist, [None] * len(waitlist))))
mapper = bus.get_object(
obmc.mapper.MAPPER_NAME,
obmc.mapper.MAPPER_PATH,
introspect=False)
self.iface = dbus.Interface(
mapper, dbus_interface=obmc.mapper.MAPPER_IFACE)
self.done = False
self.callback = kw.pop('callback', None)
self.error_callback = kw.pop('error_callback', self.default_error)
self.busy_retries = kw.pop('busy_retries', 20)
self.busy_retry_delay_milliseconds = kw.pop(
'busy_retry_delay_milliseconds', 500)
self.waitlist_keyword = kw.pop('waitlist_keyword', None)
self.bus.add_signal_receiver(
self.introspection_handler,
dbus_interface=obmc.mapper.MAPPER_IFACE + '.Private',
signal_name='IntrospectionComplete')
self.bus.add_signal_receiver(
self.introspection_handler,
dbus_interface=dbus.BUS_DAEMON_IFACE + '.ObjectManager')
self.introspection_handler()
@staticmethod
def default_error(e):
raise e
def force_done(self):
if self.done:
return
self.done = True
self.bus.remove_signal_receiver(
self.introspection_handler,
dbus_interface=obmc.mapper.MAPPER_IFACE + '.Private',
signal_name='IntrospectionComplete')
self.bus.remove_signal_receiver(
self.introspection_handler,
dbus_interface=dbus.BUS_DAEMON_IFACE + '.ObjectManager',
signal_name='InterfacesAdded')
def check_done(self):
if not all(self.waitlist.values()) or self.done:
return
self.force_done()
if self.callback:
kwargs = {}
if self.waitlist_keyword:
kwargs[waitlist_keyword] = self.waitlist
self.callback(**kwargs)
def get_object_async(self, path, retry):
method = getattr(self.iface, 'GetObject')
method.call_async(
path,
[],
signature='sas',
reply_handler=lambda x: self.get_object_callback(
path, x),
error_handler=lambda x: self.get_object_error(
path, retry, x))
return False
def get_object_error(self, path, retry, e):
if self.done:
return
if e.get_dbus_name() == 'org.freedesktop.DBus.Error.FileNotFound':
pass
elif e.get_dbus_name() in \
['org.freedesktop.DBus.Error.ObjectPathInUse',
'org.freedesktop.DBus.Error.LimitsExceeded']:
if retry > self.busy_retries:
self.force_done()
self.error_callback(e)
else:
gobject.timeout_add(
self.busy_retry_delay_milliseconds,
self.get_object_async,
path,
retry + 1)
else:
self.force_done()
self.error_callback(e)
def get_object_callback(self, path, info):
self.waitlist[path] = list(info)[0]
self.check_done()
def introspection_handler(self, *a, **kw):
if self.done:
return
for path in [
x for x in list(self.waitlist.keys()) if not self.waitlist[x]]:
self.get_object_async(path, 0)
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