Create snapshots on web.archive.org for bookmarks (#150)

* Implement initial background tasks concept

* fix property reference

* update requirements.txt

* simplify bookmark null check

* improve web archive url display

* add background tasks test

* add basic supervisor setup

* schedule missing snapshot creation on login

* remove task locks and clear task history before starting background task processor

* batch create snapshots after import

* fix script reference in supervisord.conf

* add option to disable background tasks

* restructure feature overview

.dockerignore

@@ -7,6 +7,7 @@
 /docs
 /static
 /build
+/out
 
 /.dockerignore
 /.gitignore
@@ -17,10 +18,13 @@
 /*.patch
 /*.md
 /*.js
+/*.log
+/*.pid
 
 # Whitelist files needed in build or prod image
 !/rollup.config.js
 !/bootstrap.sh
+!/background-tasks-wrapper.sh
 
 # Remove development settings
 /siteroot/settings/dev.py

.env.sample

@@ -5,5 +5,7 @@ LD_HOST_PORT=9090
 # Directory on the host system that should be mounted as data dir into the Docker container
 LD_HOST_DATA_DIR=./data
 
+# Option to disable background tasks
+LD_DISABLE_BACKGROUND_TASKS=False
 # Option to disable URL validation for bookmarks completely
-LD_DISABLE_URL_VALIDATION=False
+LD_DISABLE_URL_VALIDATION=False

README.md

@@ -13,17 +13,14 @@ The name comes from:
 - Search by text or tags
 - Bulk editing
 - Bookmark archive
-- Automatically provides titles and descriptions from linked websites 
-- Import and export bookmarks in Netscape HTML format
-- Extensions for [Firefox](https://addons.mozilla.org/de/firefox/addon/linkding-extension/) and [Chrome](https://chrome.google.com/webstore/detail/linkding-extension/beakmhbijpdhipnjhnclmhgjlddhidpe)
-- Bookmarklet that should work in most browsers
 - Dark mode
-- Easy to set up using Docker
+- Automatically creates snapshots of bookmarked websites on [web archive](https://archive.org/web/)
-- Uses SQLite as database
+- Automatically provides titles and descriptions of bookmarked websites 
-- Works without Javascript
+- Import and export bookmarks in Netscape HTML format
-- ...but has several UI enhancements when Javascript is enabled
+- Extensions for [Firefox](https://addons.mozilla.org/de/firefox/addon/linkding-extension/) and [Chrome](https://chrome.google.com/webstore/detail/linkding-extension/beakmhbijpdhipnjhnclmhgjlddhidpe), and a bookmarklet that should work in most browsers
 - REST API for developing 3rd party apps
 - Admin panel for user self-service and raw data access
+- Easy to set up using Docker, uses SQLite as database
 
 
 **Demo:** https://demo.linkding.link/ (configured with open registration)

background-tasks-wrapper.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+# Wrapper script used by supervisord to first clear task locks before starting the background task processor
+
+python manage.py clean_tasks
+exec python manage.py process_tasks

bookmarks/apps.py

@@ -3,3 +3,7 @@ from django.apps import AppConfig
 
 class BookmarksConfig(AppConfig):
     name = 'bookmarks'
+
+    def ready(self):
+        # Register signal handlers
+        import bookmarks.signals

bookmarks/management/commands/clean_tasks.py

@@ -0,0 +1,15 @@
+from background_task.models import Task, CompletedTask
+from django.core.management.base import BaseCommand
+
+
+class Command(BaseCommand):
+    help = "Remove task locks and clear completed task history"
+
+    def handle(self, *args, **options):
+        # Remove task locks
+        # If the background task processor exited while executing tasks, these tasks would still be marked as locked,
+        # even though no process is working on them, and would prevent the task processor from picking the next task in
+        # the queue
+        Task.objects.all().update(locked_by=None, locked_at=None)
+        # Clear task history to prevent them from bloating the DB
+        CompletedTask.objects.all().delete()

bookmarks/migrations/0009_bookmark_web_archive_snapshot_url.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.2.20 on 2021-05-16 14:35
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookmarks', '0008_userprofile_bookmark_date_display'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='bookmark',
+            name='web_archive_snapshot_url',
+            field=models.CharField(blank=True, max_length=2048),
+        ),
+    ]

bookmarks/models.py

@@ -41,6 +41,7 @@ class Bookmark(models.Model):
     description = models.TextField(blank=True)
     website_title = models.CharField(max_length=512, blank=True, null=True)
     website_description = models.TextField(blank=True, null=True)
+    web_archive_snapshot_url = models.CharField(max_length=2048, blank=True)
     unread = models.BooleanField(default=True)
     is_archived = models.BooleanField(default=False)
     date_added = models.DateTimeField()

bookmarks/services/bookmarks.py

@@ -6,6 +6,7 @@ from django.utils import timezone
 from bookmarks.models import Bookmark, parse_tag_string
 from bookmarks.services.tags import get_or_create_tags
 from bookmarks.services.website_loader import load_website_metadata
+from bookmarks.services import tasks
 
 
 def create_bookmark(bookmark: Bookmark, tag_string: str, current_user: User):
@@ -27,10 +28,16 @@ def create_bookmark(bookmark: Bookmark, tag_string: str, current_user: User):
     # Update tag list
     _update_bookmark_tags(bookmark, tag_string, current_user)
     bookmark.save()
+    # Create snapshot on web archive
+    tasks.create_web_archive_snapshot(bookmark.id, False)
+
     return bookmark
 
 
 def update_bookmark(bookmark: Bookmark, tag_string, current_user: User):
+    # Detect URL change
+    original_bookmark = Bookmark.objects.get(id=bookmark.id)
+    has_url_changed = original_bookmark.url != bookmark.url
     # Update website info
     _update_website_metadata(bookmark)
     # Update tag list
@@ -38,6 +45,10 @@ def update_bookmark(bookmark: Bookmark, tag_string, current_user: User):
     # Update dates
     bookmark.date_modified = timezone.now()
     bookmark.save()
+    # Update web archive snapshot, if URL changed
+    if has_url_changed:
+        tasks.create_web_archive_snapshot(bookmark.id, True)
+
     return bookmark
 
 

bookmarks/services/importer.py

@@ -5,6 +5,7 @@ from django.contrib.auth.models import User
 from django.utils import timezone
 
 from bookmarks.models import Bookmark, parse_tag_string
+from bookmarks.services import tasks
 from bookmarks.services.parser import parse, NetscapeBookmark
 from bookmarks.services.tags import get_or_create_tags
 from bookmarks.utils import parse_timestamp
@@ -38,6 +39,9 @@ def import_netscape_html(html: str, user: User):
             logging.exception('Error importing bookmark: ' + shortened_bookmark_tag_str)
             result.failed = result.failed + 1
 
+    # Create snapshots for newly imported bookmarks
+    tasks.schedule_bookmarks_without_snapshots(user.id)
+
     return result
 
 

bookmarks/services/tasks.py

@@ -0,0 +1,62 @@
+import logging
+
+import waybackpy
+from background_task import background
+from django.conf import settings
+from django.contrib.auth import get_user_model
+from waybackpy.exceptions import WaybackError
+
+from bookmarks.models import Bookmark
+
+logger = logging.getLogger(__name__)
+
+
+def when_background_tasks_enabled(fn):
+    def wrapper(*args, **kwargs):
+        if settings.LD_DISABLE_BACKGROUND_TASKS:
+            return
+        return fn(*args, **kwargs)
+
+    # Expose attributes from wrapped TaskProxy function
+    attrs = vars(fn)
+    for key, value in attrs.items():
+        setattr(wrapper, key, value)
+
+    return wrapper
+
+
+@when_background_tasks_enabled
+@background()
+def create_web_archive_snapshot(bookmark_id: int, force_update: bool):
+    try:
+        bookmark = Bookmark.objects.get(id=bookmark_id)
+    except Bookmark.DoesNotExist:
+        return
+
+    # Skip if snapshot exists and update is not explicitly requested
+    if bookmark.web_archive_snapshot_url and not force_update:
+        return
+
+    logger.debug(f'Create web archive link for bookmark: {bookmark}...')
+
+    wayback = waybackpy.Url(bookmark.url)
+
+    try:
+        archive = wayback.save()
+    except WaybackError as error:
+        logger.exception(f'Error creating web archive link for bookmark: {bookmark}...', exc_info=error)
+        raise
+
+    bookmark.web_archive_snapshot_url = archive.archive_url
+    bookmark.save()
+    logger.debug(f'Successfully created web archive link for bookmark: {bookmark}...')
+
+
+@when_background_tasks_enabled
+@background()
+def schedule_bookmarks_without_snapshots(user_id: int):
+    user = get_user_model().objects.get(id=user_id)
+    bookmarks_without_snapshots = Bookmark.objects.filter(web_archive_snapshot_url__exact='', owner=user)
+
+    for bookmark in bookmarks_without_snapshots:
+        create_web_archive_snapshot(bookmark.id, False)

bookmarks/signals.py

@@ -0,0 +1,8 @@
+from django.contrib.auth import user_logged_in
+from django.dispatch import receiver
+from bookmarks.services import tasks
+
+
+@receiver(user_logged_in)
+def user_logged_in(sender, request, user, **kwargs):
+    tasks.schedule_bookmarks_without_snapshots(user.id)

bookmarks/styles/bookmarks.scss

@@ -54,6 +54,10 @@ ul.bookmark-list {
     margin-right: 0.1rem;
   }
 
+  .actions .date-label a {
+    color: $gray-color;
+  }
+
   .actions .btn-link {
     color: $gray-color;
     padding: 0;

bookmarks/templates/bookmarks/bookmark_list.html

@@ -27,11 +27,31 @@
             </div>
             <div class="actions">
                 {% if request.user.profile.bookmark_date_display == 'relative' %}
-                    <span class="text-gray text-sm">{{ bookmark.date_added|humanize_relative_date }}</span>
+                    <span class="date-label text-gray text-sm">
+                        {% if bookmark.web_archive_snapshot_url %}
+                        <a href="{{ bookmark.web_archive_snapshot_url }}"
+                           title="Show snapshot on web archive" target="_blank" rel="noopener">
+                        {% endif %}
+                        <span>{{ bookmark.date_added|humanize_relative_date }}</span>
+                        {% if bookmark.web_archive_snapshot_url %}
+                        <span>∞</span>
+                        </a>
+                        {% endif %}
+                    </span>
                     <span class="text-gray text-sm">|</span>
                 {% endif %}
                 {% if request.user.profile.bookmark_date_display == 'absolute' %}
-                    <span class="text-gray text-sm">{{ bookmark.date_added|humanize_absolute_date }}</span>
+                    <span class="date-label text-gray text-sm">
+                        {% if bookmark.web_archive_snapshot_url %}
+                        <a href="{{ bookmark.web_archive_snapshot_url }}"
+                           title="Show snapshot on web archive" target="_blank" rel="noopener">
+                        {% endif %}
+                        <span>{{ bookmark.date_added|humanize_absolute_date }}</span>
+                        {% if bookmark.web_archive_snapshot_url %}
+                        <span>∞</span>
+                        </a>
+                        {% endif %}
+                    </span>
                     <span class="text-gray text-sm">|</span>
                 {% endif %}
                 <a href="{% url 'bookmarks:edit' bookmark.id %}?return_url={{ return_url }}"

bookmarks/tests/helpers.py

@@ -28,6 +28,7 @@ class BookmarkFactoryMixin:
                        description: str = '',
                        website_title: str = '',
                        website_description: str = '',
+                       web_archive_snapshot_url: str = '',
                        ):
         if tags is None:
             tags = []
@@ -45,7 +46,8 @@ class BookmarkFactoryMixin:
             date_added=timezone.now(),
             date_modified=timezone.now(),
             owner=user,
-            is_archived=is_archived
+            is_archived=is_archived,
+            web_archive_snapshot_url=web_archive_snapshot_url,
         )
         bookmark.save()
         for tag in tags:

bookmarks/tests/test_bookmarks_list_tag.py

@@ -24,9 +24,10 @@ class BookmarkListTagTest(TestCase, BookmarkFactoryMixin):
         )
         return template_to_render.render(context)
 
-    def setup_date_format_test(self, date_display_setting):
+    def setup_date_format_test(self, date_display_setting: str, web_archive_url: str = ''):
         bookmark = self.setup_bookmark()
         bookmark.date_added = timezone.now() - relativedelta(days=8)
+        bookmark.web_archive_snapshot_url = web_archive_url
         bookmark.save()
         user = self.get_or_create_test_user()
         user.profile.bookmark_date_display = date_display_setting
@@ -39,7 +40,27 @@ class BookmarkListTagTest(TestCase, BookmarkFactoryMixin):
         formatted_date = formats.date_format(bookmark.date_added, 'SHORT_DATE_FORMAT')
 
         self.assertInHTML(f'''
-        <span class="text-gray text-sm">{formatted_date}</span>
+        <span class="date-label text-gray text-sm">
+            <span>{formatted_date}</span>
+        </span>
+        <span class="text-gray text-sm">|</span>
+        ''', html)
+
+    def test_should_render_web_archive_link_with_absolute_date_setting(self):
+        bookmark = self.setup_date_format_test(UserProfile.BOOKMARK_DATE_DISPLAY_ABSOLUTE,
+                                               'https://web.archive.org/web/20210811214511/https://wanikani.com/')
+        html = self.render_template([bookmark])
+        formatted_date = formats.date_format(bookmark.date_added, 'SHORT_DATE_FORMAT')
+
+        self.assertInHTML(f'''
+        <span class="date-label text-gray text-sm">
+            <a href="{bookmark.web_archive_snapshot_url}"
+               title="Show snapshot on web archive" target="_blank" rel="noopener">
+                <span>{formatted_date}</span>
+                <span>∞</span>
+            </a>
+        </span>
+        <span class="text-gray text-sm">|</span>
         ''', html)
 
     def test_should_respect_relative_date_setting(self):
@@ -47,5 +68,23 @@ class BookmarkListTagTest(TestCase, BookmarkFactoryMixin):
         html = self.render_template([bookmark])
 
         self.assertInHTML('''
-        <span class="text-gray text-sm">1 week ago</span>
+        <span class="date-label text-gray text-sm">
+            <span>1 week ago</span>
+        </span>
+        <span class="text-gray text-sm">|</span>
+        ''', html)
+
+    def test_should_render_web_archive_link_with_relative_date_setting(self):
+        bookmark = self.setup_date_format_test(UserProfile.BOOKMARK_DATE_DISPLAY_RELATIVE,
+                                               'https://web.archive.org/web/20210811214511/https://wanikani.com/')
+        html = self.render_template([bookmark])
+        self.assertInHTML(f'''
+        <span class="date-label text-gray text-sm">
+            <a href="{bookmark.web_archive_snapshot_url}"
+               title="Show snapshot on web archive" target="_blank" rel="noopener">
+                <span>1 week ago</span>
+                <span>∞</span>
+            </a>
+        </span>
+        <span class="text-gray text-sm">|</span>
         ''', html)

bookmarks/tests/test_bookmarks_service.py

@@ -1,11 +1,14 @@
+from unittest.mock import patch
+
 from django.contrib.auth import get_user_model
 from django.test import TestCase
 from django.utils import timezone
 
 from bookmarks.models import Bookmark, Tag
-from bookmarks.services.bookmarks import archive_bookmark, archive_bookmarks, unarchive_bookmark, unarchive_bookmarks, \
+from bookmarks.services.bookmarks import create_bookmark, update_bookmark, archive_bookmark, archive_bookmarks, \
-    delete_bookmarks, tag_bookmarks, untag_bookmarks
+    unarchive_bookmark, unarchive_bookmarks, delete_bookmarks, tag_bookmarks, untag_bookmarks
 from bookmarks.tests.helpers import BookmarkFactoryMixin
+from bookmarks.services import tasks
 
 User = get_user_model()
 
@@ -13,7 +16,30 @@ User = get_user_model()
 class BookmarkServiceTestCase(TestCase, BookmarkFactoryMixin):
 
     def setUp(self) -> None:
-        self.user = User.objects.create_user('testuser', 'test@example.com', 'password123')
+        self.get_or_create_test_user()
+
+    def test_create_should_create_web_archive_snapshot(self):
+        with patch.object(tasks, 'create_web_archive_snapshot') as mock_create_web_archive_snapshot:
+            bookmark_data = Bookmark(url='https://example.com')
+            bookmark = create_bookmark(bookmark_data, 'tag1 tag2', self.user)
+
+            mock_create_web_archive_snapshot.assert_called_once_with(bookmark.id, False)
+
+    def test_update_should_create_web_archive_snapshot_if_url_did_change(self):
+        with patch.object(tasks, 'create_web_archive_snapshot') as mock_create_web_archive_snapshot:
+            bookmark = self.setup_bookmark()
+            bookmark.url = 'https://example.com/updated'
+            update_bookmark(bookmark, 'tag1 tag2', self.user)
+
+            mock_create_web_archive_snapshot.assert_called_once_with(bookmark.id, True)
+
+    def test_update_should_not_create_web_archive_snapshot_if_url_did_not_change(self):
+        with patch.object(tasks, 'create_web_archive_snapshot') as mock_create_web_archive_snapshot:
+            bookmark = self.setup_bookmark()
+            bookmark.title = 'updated title'
+            update_bookmark(bookmark, 'tag1 tag2', self.user)
+
+            mock_create_web_archive_snapshot.assert_not_called()
 
     def test_archive_bookmark(self):
         bookmark = Bookmark(

bookmarks/tests/test_bookmarks_tasks.py

@@ -0,0 +1,154 @@
+from unittest.mock import patch
+
+import waybackpy
+from background_task.models import Task
+from django.contrib.auth.models import User
+from django.test import TestCase, override_settings
+
+from bookmarks.models import Bookmark
+from bookmarks.services.tasks import create_web_archive_snapshot, schedule_bookmarks_without_snapshots
+from bookmarks.tests.helpers import BookmarkFactoryMixin, disable_logging
+
+
+class MockWaybackUrl:
+
+    def __init__(self, archive_url: str):
+        self.archive_url = archive_url
+
+    def save(self):
+        return self
+
+
+class MockWaybackUrlWithSaveError:
+    def save(self):
+        raise NotImplementedError
+
+
+class BookmarkTasksTestCase(TestCase, BookmarkFactoryMixin):
+
+    @disable_logging
+    def run_pending_task(self, task_function):
+        func = getattr(task_function, 'task_function', None)
+        task = Task.objects.all()[0]
+        args, kwargs = task.params()
+        func(*args, **kwargs)
+        task.delete()
+
+    @disable_logging
+    def run_all_pending_tasks(self, task_function):
+        func = getattr(task_function, 'task_function', None)
+        tasks = Task.objects.all()
+
+        for task in tasks:
+            args, kwargs = task.params()
+            func(*args, **kwargs)
+            task.delete()
+
+    def test_create_web_archive_snapshot_should_update_snapshot_url(self):
+        bookmark = self.setup_bookmark()
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://example.com')):
+            create_web_archive_snapshot(bookmark.id, False)
+            self.run_pending_task(create_web_archive_snapshot)
+            bookmark.refresh_from_db()
+
+            self.assertEqual(bookmark.web_archive_snapshot_url, 'https://example.com')
+
+    def test_create_web_archive_snapshot_should_handle_missing_bookmark_id(self):
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://example.com')) as mock_wayback_url:
+            create_web_archive_snapshot(123, False)
+            self.run_pending_task(create_web_archive_snapshot)
+
+            mock_wayback_url.assert_not_called()
+
+    def test_create_web_archive_snapshot_should_handle_wayback_save_error(self):
+        bookmark = self.setup_bookmark()
+
+        with patch.object(waybackpy, 'Url',
+                          return_value=MockWaybackUrlWithSaveError()):
+            with self.assertRaises(NotImplementedError):
+                create_web_archive_snapshot(bookmark.id, False)
+                self.run_pending_task(create_web_archive_snapshot)
+
+    def test_create_web_archive_snapshot_should_skip_if_snapshot_exists(self):
+        bookmark = self.setup_bookmark(web_archive_snapshot_url='https://example.com')
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://other.com')):
+            create_web_archive_snapshot(bookmark.id, False)
+            self.run_pending_task(create_web_archive_snapshot)
+            bookmark.refresh_from_db()
+
+            self.assertEqual(bookmark.web_archive_snapshot_url, 'https://example.com')
+
+    def test_create_web_archive_snapshot_should_force_update_snapshot(self):
+        bookmark = self.setup_bookmark(web_archive_snapshot_url='https://example.com')
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://other.com')):
+            create_web_archive_snapshot(bookmark.id, True)
+            self.run_pending_task(create_web_archive_snapshot)
+            bookmark.refresh_from_db()
+
+            self.assertEqual(bookmark.web_archive_snapshot_url, 'https://other.com')
+
+    @override_settings(LD_DISABLE_BACKGROUND_TASKS=True)
+    def test_create_web_archive_snapshot_should_not_run_when_background_tasks_are_disabled(self):
+        bookmark = self.setup_bookmark()
+        create_web_archive_snapshot(bookmark.id, False)
+
+        self.assertEqual(Task.objects.count(), 0)
+
+    def test_schedule_bookmarks_without_snapshots_should_create_snapshot_task_for_all_bookmarks_without_snapshot(self):
+        user = self.get_or_create_test_user()
+        self.setup_bookmark()
+        self.setup_bookmark()
+        self.setup_bookmark()
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://example.com')):
+            schedule_bookmarks_without_snapshots(user.id)
+            self.run_pending_task(schedule_bookmarks_without_snapshots)
+            self.run_all_pending_tasks(create_web_archive_snapshot)
+
+            for bookmark in Bookmark.objects.all():
+                self.assertEqual(bookmark.web_archive_snapshot_url, 'https://example.com')
+
+    def test_schedule_bookmarks_without_snapshots_should_not_update_bookmarks_with_existing_snapshot(self):
+        user = self.get_or_create_test_user()
+        self.setup_bookmark(web_archive_snapshot_url='https://example.com')
+        self.setup_bookmark(web_archive_snapshot_url='https://example.com')
+        self.setup_bookmark(web_archive_snapshot_url='https://example.com')
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://other.com')):
+            schedule_bookmarks_without_snapshots(user.id)
+            self.run_pending_task(schedule_bookmarks_without_snapshots)
+            self.run_all_pending_tasks(create_web_archive_snapshot)
+
+            for bookmark in Bookmark.objects.all():
+                self.assertEqual(bookmark.web_archive_snapshot_url, 'https://example.com')
+
+    def test_schedule_bookmarks_without_snapshots_should_only_update_user_owned_bookmarks(self):
+        user = self.get_or_create_test_user()
+        other_user = User.objects.create_user('otheruser', 'otheruser@example.com', 'password123')
+        self.setup_bookmark()
+        self.setup_bookmark()
+        self.setup_bookmark()
+        self.setup_bookmark(user=other_user)
+        self.setup_bookmark(user=other_user)
+        self.setup_bookmark(user=other_user)
+
+        with patch.object(waybackpy, 'Url', return_value=MockWaybackUrl('https://example.com')):
+            schedule_bookmarks_without_snapshots(user.id)
+            self.run_pending_task(schedule_bookmarks_without_snapshots)
+            self.run_all_pending_tasks(create_web_archive_snapshot)
+
+            for bookmark in Bookmark.objects.all().filter(owner=user):
+                self.assertEqual(bookmark.web_archive_snapshot_url, 'https://example.com')
+
+            for bookmark in Bookmark.objects.all().filter(owner=other_user):
+                self.assertEqual(bookmark.web_archive_snapshot_url, '')
+
+    @override_settings(LD_DISABLE_BACKGROUND_TASKS=True)
+    def test_schedule_bookmarks_without_snapshots_should_not_run_when_background_tasks_are_disabled(self):
+        user = self.get_or_create_test_user()
+        schedule_bookmarks_without_snapshots(user.id)
+
+        self.assertEqual(Task.objects.count(), 0)

bookmarks/tests/test_importer.py

@@ -1,5 +1,8 @@
+from unittest.mock import patch
+
 from django.test import TestCase
 
+from bookmarks.services import tasks
 from bookmarks.services.importer import import_netscape_html
 from bookmarks.tests.helpers import BookmarkFactoryMixin, disable_logging
 
@@ -31,3 +34,12 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin):
         import_result = import_netscape_html(test_html, self.get_or_create_test_user())
 
         self.assertEqual(import_result.success, 0)
+
+    def test_schedule_snapshot_creation(self):
+        user = self.get_or_create_test_user()
+        test_html = self.create_import_html('')
+
+        with patch.object(tasks, 'schedule_bookmarks_without_snapshots') as mock_schedule_bookmarks_without_snapshots:
+            import_netscape_html(test_html, user)
+
+            mock_schedule_bookmarks_without_snapshots.assert_called_once_with(user.id)

bookmarks/tests/test_signals.py

@@ -0,0 +1,15 @@
+from unittest.mock import patch
+
+from django.test import TestCase
+
+from bookmarks.services import tasks
+from bookmarks.tests.helpers import BookmarkFactoryMixin
+
+
+class SignalsTestCase(TestCase, BookmarkFactoryMixin):
+    def test_login_should_schedule_snapshot_creation(self):
+        user = self.get_or_create_test_user()
+
+        with patch.object(tasks, 'schedule_bookmarks_without_snapshots') as mock_schedule_bookmarks_without_snapshots:
+            self.client.force_login(user)
+            mock_schedule_bookmarks_without_snapshots.assert_called_once_with(user.id)

bootstrap.sh

@@ -12,5 +12,10 @@ python manage.py generate_secret_key
 # Ensure the DB folder is owned by the right user
 chown -R www-data: /etc/linkding/data
 
+# Start background task processor using supervisord, unless explicitly disabled
+if [ "$LD_DISABLE_BACKGROUND_TASKS" != "True" ]; then
+  supervisord -c supervisord.conf
+fi
+
 # Start uwsgi server
 uwsgi uwsgi.ini

docs/Options.md

@@ -25,11 +25,20 @@ All options need to be defined as environment variables in the environment that
 
 ## List of options
 
+### `LD_DISABLE_BACKGROUND_TASKS`
+
+Values: `True`, `False` | Default = `False`
+
+Disables background tasks, such as creating snapshots for bookmarks on the web archive.
+Enabling this flag will prevent the background task processor from starting up, and prevents scheduling tasks.
+This might be useful if you are experiencing performance issues or other problematic behaviour due to background task processing.
+
 ### `LD_DISABLE_URL_VALIDATION`
 
 Values: `True`, `False` | Default = `False`
 
-Completely disables URL validation for bookmarks. This can be useful if you intend to store non fully qualified domain name URLs, such as network paths, or you want to store URLs that use another protocol than `http` or `https`.
+Completely disables URL validation for bookmarks.
+This can be useful if you intend to store non fully qualified domain name URLs, such as network paths, or you want to store URLs that use another protocol than `http` or `https`.
 
 ### `LD_REQUEST_TIMEOUT`
 

requirements.prod.txt

@@ -4,6 +4,8 @@ certifi==2019.6.16
 charset-normalizer==2.0.4
 confusable-homoglyphs==3.2.0
 Django==3.2.6
+django-background-tasks==1.2.5
+django-compat==1.0.15
 django-generate-secret-key==1.0.2
 django-picklefield==3.0.1
 django-registration==3.2
@@ -17,6 +19,8 @@ pytz==2021.1
 requests==2.26.0
 soupsieve==1.9.2
 sqlparse==0.4.1
+supervisor==4.2.2
 typing-extensions==3.10.0.0
 urllib3==1.26.6
 uWSGI==2.0.18
+waybackpy==2.4.3

requirements.txt

@@ -6,6 +6,8 @@ confusable-homoglyphs==3.2.0
 coverage==5.5
 Django==3.2.6
 django-appconf==1.0.4
+django-background-tasks==1.2.5
+django-compat==1.0.15
 django-compressor==2.4.1
 django-debug-toolbar==3.2.1
 django-generate-secret-key==1.0.2
@@ -27,3 +29,4 @@ soupsieve==1.9.2
 sqlparse==0.4.1
 typing-extensions==3.10.0.0
 urllib3==1.26.6
+waybackpy==2.4.3

siteroot/settings/base.py

@@ -42,6 +42,7 @@ INSTALLED_APPS = [
     'django_generate_secret_key',
     'rest_framework',
     'rest_framework.authtoken',
+    'background_task',
 ]
 
 MIDDLEWARE = [
@@ -166,3 +167,14 @@ ALLOW_REGISTRATION = False
 
 # URL validation flag
 LD_DISABLE_URL_VALIDATION = os.getenv('LD_DISABLE_URL_VALIDATION', False) in (True, 'True', '1')
+
+# Background task enabled setting
+LD_DISABLE_BACKGROUND_TASKS = os.getenv('LD_DISABLE_BACKGROUND_TASKS', False) in (True, 'True', '1')
+
+# django-background-tasks
+MAX_ATTEMPTS = 5
+# How many tasks will run in parallel
+# We want to keep this low to prevent SQLite lock errors and in general not to consume too much resources on smaller
+# specced systems like Raspberries. Should be OK as tasks are not time critical.
+BACKGROUND_TASK_RUN_ASYNC = True
+BACKGROUND_TASK_ASYNC_THREADS = 2

siteroot/settings/dev.py

@@ -43,6 +43,11 @@ LOGGING = {
         'django.db.backends': {
             'level': 'ERROR',  # Set to DEBUG to log all SQL calls
             'handlers': ['console'],
+        },
+        'bookmarks.services.tasks': {  # Log task output
+            'level': 'DEBUG',
+            'handlers': ['console'],
+            'propagate': False,
         }
     }
 }

supervisord.conf

@@ -0,0 +1,10 @@
+[supervisord]
+user=root
+loglevel=info
+
+[program:jobs]
+user=www-data
+command=sh background-tasks-wrapper.sh
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+redirect_stderr=true