dbusmock/polkitd: Add ability to simulate call hangs or delays

Added various methods that allow to make methods to delay to return a
value, both by using timing functions and using a way to manually
stop and restart the calls.

This is mostly done using async callbacks in dbus methods

tests/dbusmock/polkitd.py

@@ -18,6 +18,7 @@ __copyright__ = '(c) 2020 Canonical Ltd.'
 __license__ = 'LGPL 3+'
 
 import dbus
+import time
 
 from dbusmock import MOCK_IFACE, mockobject
 
@@ -32,6 +33,10 @@ def load(mock, parameters):
     # default state
     polkitd.allow_unknown = False
     polkitd.allowed = []
+    polkitd.delay = 0
+    polkitd.simulate_hang = False
+    polkitd.hanging_actions = []
+    polkitd.hanging_calls = []
 
     mock.AddProperties(MAIN_IFACE,
                        dbus.Dictionary({
@@ -42,10 +47,18 @@ def load(mock, parameters):
 
 
 @dbus.service.method(MAIN_IFACE,
-                     in_signature='(sa{sv})sa{ss}us', out_signature='(bba{ss})')
-def CheckAuthorization(self, subject, action_id, details, flags, cancellation_id):
-    return (action_id in self.allowed or self.allow_unknown, False, {'test': 'test'})
+                     in_signature='(sa{sv})sa{ss}us', out_signature='(bba{ss})',
+                     async_callbacks=('ok_cb', 'err_cb'))
+def CheckAuthorization(self, subject, action_id, details, flags, cancellation_id,
+                       ok_cb, err_cb):
+    time.sleep(self.delay)
+    allowed = action_id in self.allowed or self.allow_unknown
+    ret = (allowed, False, {'test': 'test'})
 
+    if self.simulate_hang or action_id in self.hanging_actions:
+        self.hanging_calls.append((ok_cb, ret))
+    else:
+        ok_cb(ret)
 
 @dbus.service.method(MOCK_IFACE, in_signature='b', out_signature='')
 def AllowUnknown(self, default):
@@ -56,6 +69,32 @@ def AllowUnknown(self, default):
     '''
     self.allow_unknown = default
 
+@dbus.service.method(MOCK_IFACE, in_signature='d', out_signature='')
+def SetDelay(self, delay):
+    '''Makes the CheckAuthorization() method to delay'''
+    self.delay = delay
+
+@dbus.service.method(MOCK_IFACE, in_signature='b', out_signature='')
+def SimulateHang(self, hang):
+    '''Makes the CheckAuthorization() method to hang'''
+    self.simulate_hang = hang
+
+@dbus.service.method(MOCK_IFACE, in_signature='as', out_signature='')
+def SimulateHangActions(self, actions):
+    '''Makes the CheckAuthorization() method to hang on such actions'''
+    self.hanging_actions = actions
+
+@dbus.service.method(MOCK_IFACE, in_signature='', out_signature='')
+def ReleaseHangingCalls(self):
+    '''Calls all the hanging callbacks'''
+    for (cb, ret) in self.hanging_calls:
+        cb(ret)
+    self.hanging_calls = []
+
+@dbus.service.method(MOCK_IFACE, in_signature='', out_signature='b')
+def HaveHangingCalls(self):
+    '''Check if we've hangling calls'''
+    return len(self.hanging_calls)
 
 @dbus.service.method(MOCK_IFACE, in_signature='as', out_signature='')
 def SetAllowed(self, actions):