Update to work with serializable

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Changelog
 
+* 4.0.5 Updates panel to work with upcoming `serializable` branch.
 * 4.0.4 Patches issue with missing alternatives attribute in mail object.
 * 4.0.2 Mail panel is added by default to the debug toolbar.
 * 4.0.0 Adds support for Django 4.0

mail_panel/backend.py

@@ -9,17 +9,14 @@
 
 class MailToolbarBackendEmail(mail.EmailMultiAlternatives):
     def __init__(self, message):
-        try:
-            self.id = uuid4().get_hex()
-        except AttributeError:
-            self.id = uuid4().hex  # python 3
+        self.id = uuid4().hex
         self.date_sent = now()
         self.read = False
         message.message()  # triggers header validation
 
         alternatives = getattr(message, "alternatives", None)
 
-        super(MailToolbarBackendEmail, self).__init__(
+        super().__init__(
             subject=message.subject,
             to=message.to,
             cc=message.cc,
@@ -33,6 +30,10 @@ def __init__(self, message):
         )
 
 
+    @property
+    def get_subject(self):
+        return self.subject
+
 class MailToolbarBackend(EmailBackend):
     """A email backend for use during testing.
 
@@ -44,7 +45,7 @@ class MailToolbarBackend(EmailBackend):
     """
 
     def __init__(self, *args, **kwargs):
-        super(MailToolbarBackend, self).__init__(*args, **kwargs)
+        super().__init__(*args, **kwargs)
 
         self.outbox = load_outbox()
 
@@ -57,4 +58,4 @@ def send_messages(self, messages):
 
         save_outbox(self.outbox)
 
-        return super(MailToolbarBackend, self).send_messages(messages)
+        return super().send_messages(messages)

mail_panel/panels.py

@@ -3,14 +3,11 @@
 from collections import OrderedDict
 import datetime
 
+from django.template.loader import render_to_string
 from django.templatetags.static import static
 from django.utils.timezone import now
 
-try:
-    from debug_toolbar.panels import Panel
-except ImportError:
-    # django-debug-toolbar 1.x back compatibility
-    from debug_toolbar.panels import DebugPanel as Panel
+from debug_toolbar.panels import Panel
 
 from .conf import MAIL_TOOLBAR_TTL
 from .utils import load_outbox, save_outbox
@@ -24,17 +21,19 @@ class MailToolbarPanel(Panel):
     name = 'Mail'
     template = 'mail_panel/panel.html'
     has_content = True
+    is_historical = False
     mail_list = OrderedDict()
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
     @property
     def scripts(self):
         scripts = super().scripts
         scripts.append(static("debug_toolbar/mail/toolbar.mail.js"))
         return scripts
 
-    def nav_title(self):
-        return _('Mail')
-
+    @property
     def nav_subtitle(self):
         mail_list = load_outbox()
         unread_count = 0
@@ -47,17 +46,31 @@ def nav_subtitle(self):
             return '{0} unread messages'.format(unread_count)
         return ''
 
+    @property
     def title(self):
         return _('Mail')
 
-    def generate_stats(self, request, response):
+    def get_stats(self):
+        return self.generate_stats()
+
+    @property
+    def content(self):
+        mail_list = self.get_mail_list()
+        self.record_stats({"mail_list": mail_list})
+        return render_to_string('mail_panel/panel.html', {
+            "mail_list": mail_list
+        })
+
+    def get_mail_list(self):
         """
         Main panel view.  Loads and displays listing of mail.
         """
-
         mail_list = load_outbox()
+
+        # Return empty mail list early if nothing there.
         if mail_list == {}:
-            return
+            return mail_list
+
         mail_list = OrderedDict(
             sorted(iter(mail_list.items()),
             key=lambda x: x[1].date_sent,
@@ -68,24 +81,20 @@ def generate_stats(self, request, response):
         # Expire messages past TTL
         expire_at = now() - datetime.timedelta(
             seconds=MAIL_TOOLBAR_TTL)
+
         for message_id, message in list(mail_list.items()):
             if message.date_sent < expire_at:
                 del mail_list[message_id]
 
         if prev_len != len(mail_list):
             save_outbox(mail_list)
 
-        self.mail_list = mail_list
-        self.record_stats({
-            'mail_list': self.mail_list,
-        })
+        return mail_list
 
-    def process_response(self, request, response):
-        """
-        generate_stats replace process_response in django-debug-toolbar 2.0.
-        Call generate_stats for back compatibility.
-        """
-        self.generate_stats(request, response)
+    def generate_stats(self, request, response):
+        # Need dummy info here to record data
+        # Mail is handled globally and not per-request.
+        self.record_stats({"a":"1"})
 
     @classmethod
     def get_urls(cls):

mail_panel/templates/mail_panel/panel.html

@@ -5,9 +5,11 @@
 <div class='djm-mail-toolbar'>
 
 {% if not mail_list %}
+<div style="font-size:1.5rem;">
+<svg xmlns="http://www.w3.org/2000/svg" width="2rem" height="2rem" viewBox="0 0 576 512"> <path fill="#999" d="M0 208L0 384c0 35.3 28.7 64 64 64l160 0c35.3 0 64-28.7 64-64l0-176c0-79.5-64.5-144-144-144S0 128.5 0 208zm64 0c0-8.8 7.2-16 16-16l128 0c8.8 0 16 7.2 16 16s-7.2 16-16 16L80 224c-8.8 0-16-7.2-16-16zm256 0l0 176c0 24.6-9.2 47-24.4 64L512 448c35.3 0 64-28.7 64-64l0-176c0-79.5-64.5-144-144-144L245.2 64C290.4 95.9 320 148.5 320 208zm64 0c0-8.8 7.2-16 16-16l64 0 32 0c8.8 0 16 7.2 16 16l0 64c0 8.8-7.2 16-16 16l-32 0c-8.8 0-16-7.2-16-16l0-48-48 0c-8.8 0-16-7.2-16-16z"/></svg>
 No recent mail found.
+</div>
 {% else %}
-
 {% spaceless %}
 <div class='djm-message-list djm-no-select'>
 <table id='djm_message_table'>