add after_shutdown hook

python/src/deltachat/account.py

@@ -522,6 +522,7 @@ class Account(object):
             deltachat.clear_context_callback(self._dc_context)
             del self._dc_context
             atexit.unregister(self.shutdown)
+            self._pm.hook.after_shutdown()
 
     def set_location(self, latitude=0.0, longitude=0.0, accuracy=0.0):
         """set a new location. It effects all chats where we currently

python/src/deltachat/hookspec.py

@@ -31,6 +31,10 @@ class PerAccount:
     def log_line(self, message):
         """ log a message related to the account. """
 
+    @account_hookspec
+    def after_shutdown(self):
+        """ Called when the account has been shutdown. """
+
     @account_hookspec
     def configure_completed(self, success):
         """ Called when a configure process completed. """

python/src/deltachat/tracker.py

@@ -38,6 +38,8 @@ class ConfigureFailed(RuntimeError):
 
 
 class ConfigureTracker:
+    ConfigureFailed = ConfigureFailed
+
     def __init__(self):
         self._configure_events = Queue()
         self._smtp_finished = Event()

python/tests/test_lowlevel.py

@@ -1,5 +1,6 @@
 from __future__ import print_function
 from deltachat import capi, cutil, const, set_context_callback, clear_context_callback
+from deltachat.hookspec import account_hookimpl
 from deltachat.capi import ffi
 from deltachat.capi import lib
 
@@ -18,7 +19,18 @@ def test_callback_None2int():
 
 def test_dc_close_events(tmpdir, acfactory):
     ac1 = acfactory.get_unconfigured_account()
+
+    # register after_shutdown function
+    l = []
+    class ShutdownPlugin:
+        @account_hookimpl
+        def after_shutdown(self):
+            assert not hasattr(ac1, "_dc_context")
+            l.append(1)
+    ac1.add_account_plugin(ShutdownPlugin())
+    assert hasattr(ac1, "_dc_context")
     ac1.shutdown()
+    assert l == [1]
 
     def find(info_string):
         evlog = ac1._evtracker