Fix raven integration

src/pretix/base/__init__.py

@@ -1,4 +1,5 @@
 from django.apps import AppConfig
+from django.conf import settings
 
 
 class PretixBaseConfig(AppConfig):
@@ -17,6 +18,10 @@ class PretixBaseConfig(AppConfig):
         except ImportError:
             pass
 
+        if hasattr(settings, 'RAVEN_CONFIG'):
+            from ..sentry import initialize
+            initialize()
+
 
 default_app_config = 'pretix.base.PretixBaseConfig'
 try:

src/pretix/base/templates/500.html

@@ -6,6 +6,15 @@
     <h1>{% trans "Internal Server Error" %}</h1>
     <p>{% trans "We had trouble processing your request." %}</p>
     <p>{% trans "If this problem persists, please contact us." %}</p>
+    {% if request.sentry.id %}
+        <p>
+            {% blocktrans trimmed %}
+                If you contact us, please send us the following code:
+            {% endblocktrans %}
+            <br>
+            {{ request.sentry.id }}
+        </p>
+    {% endif %}
     <p>{{ exception }}</p>
     <p class="links">
         <a id='goback' href='#'>{% trans "Take a step back" %}</a>

src/pretix/base/views/errors.py

@@ -1,5 +1,8 @@
-from django.http import HttpResponseForbidden, HttpResponseNotFound
+from django.http import (
+    HttpResponseForbidden, HttpResponseNotFound, HttpResponseServerError,
+)
 from django.middleware.csrf import REASON_NO_CSRF_COOKIE, REASON_NO_REFERER
+from django.template import TemplateDoesNotExist, loader
 from django.template.loader import get_template
 from django.utils.functional import Promise
 from django.utils.translation import ugettext as _
@@ -53,3 +56,14 @@ def page_not_found(request, exception):
     template = get_template('404.html')
     body = template.render(context, request)
     return HttpResponseNotFound(body)
+
+
+@requires_csrf_token
+def server_error(request):
+    try:
+        template = loader.get_template('500.html')
+    except TemplateDoesNotExist:
+        return HttpResponseServerError('<h1>Server Error (500)</h1>', content_type='text/html')
+    return HttpResponseServerError(template.render({
+        'request': request
+    }))