Experimental organizer-level plugin implementation

src/pretix/base/models/event.py

@@ -742,8 +742,8 @@ class Event(EventMixin, LoggedModel):
         Returns the names of the plugins activated for this event as a list.
         """
         if self.plugins is None:
-            return []
-        return self.plugins.split(",")
+            return self.organizer.get_plugins()
+        return self.plugins.split(",") + self.organizer.get_plugins()
 
     def get_cache(self):
         """

src/pretix/base/models/organizer.py

@@ -91,6 +91,10 @@ class Organizer(LoggedModel):
         verbose_name=_("Short form"),
         unique=True
     )
+    plugins = models.TextField(
+        null=True, blank=True,
+        verbose_name=_("Plugins"),
+    )
 
     class Meta:
         verbose_name = _("Organizer")
@@ -119,6 +123,14 @@ class Organizer(LoggedModel):
         """
         self.settings.cookie_consent = True
 
+    def get_plugins(self):
+        """
+        Returns the names of the plugins activated for this organizer as a list.
+        """
+        if self.plugins is None:
+            return []
+        return self.plugins.split(",")
+
     def get_cache(self):
         """
         Returns an :py:class:`ObjectRelatedCache` object. This behaves equivalent to

src/pretix/base/signals.py

@@ -96,22 +96,27 @@ def is_receiver_active(sender, receiver):
     return is_app_active(sender, app)
 
 
-class EventPluginSignal(django.dispatch.Signal):
+def is_plugin_host(sender):
+    return hasattr(sender, 'get_plugins')
+
+
+class PluginSignal(django.dispatch.Signal):
     """
     This is an extension to Django's built-in signals which differs in a way that it sends
     out it's events only to receivers which belong to plugins that are enabled for the given
     Event.
     """
 
-    def send(self, sender: Event, **named) -> List[Tuple[Callable, Any]]:
+    def send(self, sender, **named) -> List[Tuple[Callable, Any]]:
         """
         Send signal from sender to all connected receivers that belong to
         plugins enabled for the given Event.
 
-        sender is required to be an instance of ``pretix.base.models.Event``.
+        sender is required to be a plugin host (an object with a `get_plugins` method),
+        for example a ``pretix.base.models.Event``.
         """
-        if sender and not isinstance(sender, Event):
-            raise ValueError("Sender needs to be an event.")
+        if sender and not is_plugin_host(sender):
+            raise ValueError("Sender needs to be a plugin host.")
 
         responses = []
         if not self.receivers or self.sender_receivers_cache.get(sender) is NO_RECEIVERS:
@@ -126,16 +131,17 @@ class EventPluginSignal(django.dispatch.Signal):
                 responses.append((receiver, response))
         return responses
 
-    def send_chained(self, sender: Event, chain_kwarg_name, **named) -> List[Tuple[Callable, Any]]:
+    def send_chained(self, sender, chain_kwarg_name, **named) -> List[Tuple[Callable, Any]]:
         """
         Send signal from sender to all connected receivers. The return value of the first receiver
         will be used as the keyword argument specified by ``chain_kwarg_name`` in the input to the
         second receiver and so on. The return value of the last receiver is returned by this method.
 
-        sender is required to be an instance of ``pretix.base.models.Event``.
+        sender is required to be a plugin host (an object with a `get_plugins` method),
+        for example a ``pretix.base.models.Event``.
         """
-        if sender and not isinstance(sender, Event):
-            raise ValueError("Sender needs to be an event.")
+        if sender and not is_plugin_host(sender):
+            raise ValueError("Sender needs to be a plugin host.")
 
         response = named.get(chain_kwarg_name)
         if not self.receivers or self.sender_receivers_cache.get(sender) is NO_RECEIVERS:
@@ -150,16 +156,17 @@ class EventPluginSignal(django.dispatch.Signal):
                 response = receiver(signal=self, sender=sender, **named)
         return response
 
-    def send_robust(self, sender: Event, **named) -> List[Tuple[Callable, Any]]:
+    def send_robust(self, sender, **named) -> List[Tuple[Callable, Any]]:
         """
         Send signal from sender to all connected receivers. If a receiver raises an exception
         instead of returning a value, the exception is included as the result instead of
         stopping the response chain at the offending receiver.
 
-        sender is required to be an instance of ``pretix.base.models.Event``.
+        sender is required to be a plugin host (an object with a `get_plugins` method),
+        for example a ``pretix.base.models.Event``.
         """
-        if sender and not isinstance(sender, Event):
-            raise ValueError("Sender needs to be an event.")
+        if sender and not is_plugin_host(sender):
+            raise ValueError("Sender needs to be a plugin host.")
 
         responses = []
         if (
@@ -194,6 +201,14 @@ class EventPluginSignal(django.dispatch.Signal):
         return sorted_list
 
 
+class OrganizerPluginSignal(PluginSignal):
+    pass
+
+
+class EventPluginSignal(PluginSignal):
+    pass
+
+
 class GlobalSignal(django.dispatch.Signal):
     def send_chained(self, sender: Event, chain_kwarg_name, **named) -> List[Tuple[Callable, Any]]:
         """
@@ -245,7 +260,7 @@ class Registry:
         return self.by_key.get(key).get(value, (None, None))
 
 
-class EventPluginRegistry(Registry):
+class PluginRegistry(Registry):
     def __init__(self, keys):
         super().__init__({"plugin": lambda o: get_defining_app(o), **keys})
 

src/pretix/control/signals.py

@@ -34,7 +34,7 @@
 
 from django.dispatch import Signal
 
-from pretix.base.signals import DeprecatedSignal, EventPluginSignal
+from pretix.base.signals import DeprecatedSignal, EventPluginSignal, OrganizerPluginSignal
 
 html_page_start = Signal()
 """
@@ -221,7 +221,7 @@ Deprecated signal, no longer works. We just keep the definition so old plugins d
 break the installation.
 """
 
-nav_organizer = Signal()
+nav_organizer = OrganizerPluginSignal()
 """
 Arguments: 'organizer', 'request'
 

src/pretix/plugins/ticketoutputpdf/signals.py

@@ -26,8 +26,9 @@ from django.dispatch import receiver
 from django.template.loader import get_template
 from django.utils.translation import gettext_lazy as _
 
+from pretix.base.logentrytypes import EventLogEntryType
 from pretix.base.models import Event, SalesChannel
-from pretix.base.models.log import EventLogEntryType, log_entry_types
+from pretix.base.models.log import log_entry_types
 from pretix.base.signals import (  # NOQA: legacy import
     EventPluginSignal, event_copy_data, item_copy_data, layout_text_variables,
     logentry_display, logentry_object_link, register_data_exporters,