From b6b04f2739ab6111ce4073ddbdda5ceb22ecd98f Mon Sep 17 00:00:00 2001
From: Roland <roland@learningselfreliance.com>
Date: Sat, 9 Jul 2022 18:51:45 -0600
Subject: [PATCH] Removing unused code.  Updating comments.

Removing timeout.  Updating tests now that downloads work.

Bumping version for async downloads.

Downloads run asynchronously.  Using aiohttp to make archive http request so ArchiveDownloader.do_download can be asynchronous.

Removing session for create_download(s) usages.

Reworkingk create_downloads to use optional_session.

Canceling download workers after tests and when stopping the manager.

All tests passing.

Tests pass!

Downloader tests pass.

DownloadManager uses multiple workers to download domains in parallel.
---
 main.py                                 |  18 +-
 modules/archive/__init__.py             |   9 +-
 modules/archive/api.py                  |   3 +-
 modules/archive/lib.py                  |  34 +-
 modules/archive/test/test_lib.py        | 135 ++++---
 modules/videos/channel/lib.py           |   1 -
 modules/videos/channel/test/test_api.py |  13 +-
 modules/videos/conftest.py              |   4 +-
 modules/videos/downloader.py            |  21 +-
 modules/videos/test/test_downloader.py  |  73 ++--
 requirements.txt                        |  12 +-
 wrolpi/common.py                        |  13 +-
 wrolpi/conftest.py                      |  16 +-
 wrolpi/downloader.py                    | 515 +++++++++++++++---------
 wrolpi/root_api.py                      |  12 +-
 wrolpi/test/common.py                   |   3 +-
 wrolpi/test/test_db.py                  |  10 -
 wrolpi/test/test_downloader.py          | 215 +++++-----
 wrolpi/test/test_root_api.py            |   2 +
 wrolpi/test/test_rss.py                 |  41 +-
 wrolpi/test/test_timeout.py             |  47 ---
 wrolpi/timeout.py                       | 114 ------
 wrolpi/version.py                       |   2 +-
 23 files changed, 650 insertions(+), 663 deletions(-)
 delete mode 100644 wrolpi/test/test_timeout.py
 delete mode 100644 wrolpi/timeout.py

diff --git a/main.py b/main.py
index 3be0cf2c..2d4c420c 100755
--- a/main.py
+++ b/main.py
@@ -7,12 +7,13 @@ import sys
 
 import pytz
 from sanic import Sanic
+from sanic.signals import Event
 
 from wrolpi import root_api, BEFORE_STARTUP_FUNCTIONS, after_startup, limit_concurrent, admin
 from wrolpi.common import logger, get_config, import_modules, check_media_directory
 from wrolpi.dates import set_timezone
 from wrolpi.downloader import download_manager
-from wrolpi.vars import PROJECT_DIR, DOCKERIZED
+from wrolpi.vars import PROJECT_DIR, DOCKERIZED, PYTEST
 from wrolpi.version import get_version_string
 
 logger = logger.getChild('wrolpi-main')
@@ -191,16 +192,21 @@ def periodic_downloads(app: Sanic, loop):
     logger.info('Starting download manager.')
 
     async def _periodic_download():
-        download_manager.renew_recurring_downloads()
-        download_manager.delete_old_once_downloads()
+        download_manager.start_workers()
         await download_manager.do_downloads()
-        seconds = 60
-        await asyncio.sleep(seconds)
-        app.add_task(_periodic_download())
+        await asyncio.sleep(60)
+        app.add_task(_periodic_download())  # noqa
 
     app.add_task(_periodic_download())
 
 
+@root_api.api_app.signal(Event.SERVER_SHUTDOWN_BEFORE)
+def handle_server_shutdown(*args, **kwargs):
+    """Stop downloads when server is shutting down."""
+    if not PYTEST:
+        download_manager.stop()
+
+
 if __name__ == '__main__':
     loop_ = asyncio.get_event_loop()
     result_ = loop_.run_until_complete(main(loop_))
diff --git a/modules/archive/__init__.py b/modules/archive/__init__.py
index 1a0afe57..1d059e8a 100644
--- a/modules/archive/__init__.py
+++ b/modules/archive/__init__.py
@@ -30,17 +30,16 @@ class ArchiveDownloader(Downloader, ABC):
         """
         return True, None
 
-    def do_download(self, download: Download) -> DownloadResult:
+    async def do_download(self, download: Download) -> DownloadResult:
         if download.attempts > 3:
             raise UnrecoverableDownloadError(f'Max download attempts reached for {download.url}')
 
-        archive = lib.do_archive(download.url)
+        archive = await lib.do_archive(download.url)
         return DownloadResult(success=True, location=f'/archive/{archive.id}')
 
     @optional_session
-    def already_downloaded(self, url: str, session: Session = None) -> Optional[Archive]:
-        archive = session.query(Archive).filter_by(url=url).one_or_none()
-        return archive
+    def already_downloaded(self, url: str, session: Session = None) -> bool:
+        return bool(session.query(Archive).filter_by(url=url).count())
 
 
 # Archive downloader is the last downloader which should be used.
diff --git a/modules/archive/api.py b/modules/archive/api.py
index b8a62e28..de25c386 100644
--- a/modules/archive/api.py
+++ b/modules/archive/api.py
@@ -1,8 +1,7 @@
 import asyncio
 from http import HTTPStatus
 
-from requests import Request
-from sanic import response
+from sanic import response, Request
 from sanic_ext import validate
 from sanic_ext.extensions.openapi import openapi
 
diff --git a/modules/archive/lib.py b/modules/archive/lib.py
index 7c9590c2..1a325a96 100644
--- a/modules/archive/lib.py
+++ b/modules/archive/lib.py
@@ -10,14 +10,15 @@ from datetime import datetime
 from itertools import groupby
 from typing import Iterator, Optional, Tuple, List
 
-import requests
+import aiohttp
 from bs4 import BeautifulSoup
 from selenium import webdriver
 from sqlalchemy.orm import Session
 
 from modules.archive.models import Domain, Archive
 from wrolpi.cmd import which
-from wrolpi.common import get_media_directory, logger, chunks, extract_domain, chdir, escape_file_name, walk
+from wrolpi.common import get_media_directory, logger, chunks, extract_domain, chdir, escape_file_name, walk, \
+    aiohttp_post
 from wrolpi.dates import now, Seconds, local_timezone
 from wrolpi.db import get_db_session, get_db_curs, get_ranked_models, optional_session
 from wrolpi.errors import InvalidDomain, UnknownURL, InvalidArchive
@@ -102,7 +103,7 @@ def get_new_archive_files(url: str, title: Optional[str]) -> ArchiveFiles:
 ARCHIVE_TIMEOUT = Seconds.minute * 10  # Wait at most 10 minutes for response.
 
 
-def request_archive(url: str):
+async def request_archive(url: str):
     """
     Send a request to the archive service to archive the URL.
     """
@@ -110,18 +111,17 @@ def request_archive(url: str):
 
     data = {'url': url}
     try:
-        resp = requests.post(f'{ARCHIVE_SERVICE}/json', json=data, timeout=ARCHIVE_TIMEOUT)
+        contents, status = await aiohttp_post(f'{ARCHIVE_SERVICE}/json', json_=data, timeout=ARCHIVE_TIMEOUT)
+        readability = contents['readability']
+        # Compressed base64
+        singlefile = contents['singlefile']
+        screenshot = contents['screenshot']
+
+        logger.debug(f'archive request status code {status}')
     except Exception as e:
         logger.error('Error when requesting archive', exc_info=e)
         raise
 
-    logger.debug(f'archive request status {resp.status_code=}')
-
-    readability = resp.json()['readability']
-    # Compressed base64
-    singlefile = resp.json()['singlefile']
-    screenshot = resp.json()['screenshot']
-
     if not (screenshot or singlefile or readability):
         raise Exception('singlefile response was empty!')
 
@@ -147,8 +147,8 @@ def request_archive(url: str):
 
 
 SINGLE_FILE_BIN = which('single-file',
-                         '/usr/bin/single-file',  # rpi ubuntu
-                         '/usr/local/bin/single-file',  # debian
+                        '/usr/bin/single-file',  # rpi ubuntu
+                        '/usr/local/bin/single-file',  # debian
                         warn=True)
 CHROMIUM = which('chromium-browser', 'chromium',
                  '/usr/bin/chromium-browser',  # rpi ubuntu
@@ -194,8 +194,8 @@ def local_screenshot(url: str) -> bytes:
 
 
 READABILITY_BIN = which('readability-extractor',
-                         '/usr/bin/readability-extractor',  # rpi ubuntu
-                         '/usr/local/bin/readability-extractor',  # debian
+                        '/usr/bin/readability-extractor',  # rpi ubuntu
+                        '/usr/local/bin/readability-extractor',  # debian
                         warn=True)
 
 
@@ -227,7 +227,7 @@ def local_archive(url: str):
         return singlefile, readability, screenshot
 
 
-def do_archive(url: str) -> Archive:
+async def do_archive(url: str) -> Archive:
     """
     Perform the real archive request to the archiving service.  Store the resulting data into files.  Create an Archive
     record in the DB.  Create Domain/URL if missing.
@@ -236,7 +236,7 @@ def do_archive(url: str) -> Archive:
 
     if DOCKERIZED or PYTEST:
         # Perform the archive in the Archive docker container.  (Typically in the development environment).
-        singlefile, readability, screenshot = request_archive(url)
+        singlefile, readability, screenshot = await request_archive(url)
     else:
         # Perform the archive using locally installed executables.
         singlefile, readability, screenshot = local_archive(url)
diff --git a/modules/archive/test/test_lib.py b/modules/archive/test/test_lib.py
index 2bd134dd..560272fa 100644
--- a/modules/archive/test/test_lib.py
+++ b/modules/archive/test/test_lib.py
@@ -14,11 +14,11 @@ from wrolpi.dates import local_timezone
 from wrolpi.db import get_db_session
 from wrolpi.media_path import MediaPath
 from wrolpi.root_api import CustomJSONEncoder
-from wrolpi.test.common import TestAPI, wrap_test_db, skip_circleci
+from wrolpi.test.common import skip_circleci
 
 
 def make_fake_request_archive(readability=True, screenshot=True, title=True):
-    def fake_request_archive(_):
+    async def fake_request_archive(_):
         singlefile = '<html>\ntest single-file\nジにてこちら\n<title>some title</title></html>'
         r = dict(
             content=f'<html>test readability content</html>',
@@ -31,63 +31,61 @@ def make_fake_request_archive(readability=True, screenshot=True, title=True):
     return fake_request_archive
 
 
-class TestArchive(TestAPI):
+@pytest.mark.asyncio
+async def test_no_screenshot(test_session):
+    with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive(screenshot=False)):
+        archive = await do_archive('https://example.com')
+        assert isinstance(archive.singlefile_path, MediaPath)
+        assert isinstance(archive.readability_path, MediaPath)
+        # Screenshot was empty
+        assert archive.screenshot_path is None
 
-    def setUp(self) -> None:
-        super().setUp()
-        (pathlib.Path(self.tmp_dir.name) / 'archive').mkdir(exist_ok=True)
 
-    @wrap_test_db
-    def test_no_screenshot(self):
-        with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive(screenshot=False)):
-            archive = do_archive('https://example.com')
-            self.assertIsInstance(archive.singlefile_path, MediaPath)
-            self.assertIsInstance(archive.readability_path, MediaPath)
-            # Screenshot was empty
-            self.assertIsNone(archive.screenshot_path)
+@pytest.mark.asyncio
+async def test_no_readability(test_session):
+    with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive(readability=False)):
+        archive = await do_archive('https://example.com')
+        assert isinstance(archive.singlefile_path, MediaPath)
+        assert isinstance(archive.screenshot_path, MediaPath)
+        # Readability empty
+        assert archive.readability_path is None
+        assert archive.readability_txt_path is None
 
-    @wrap_test_db
-    def test_no_readability(self):
-        with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive(readability=False)):
-            archive = do_archive('https://example.com')
-            self.assertIsInstance(archive.singlefile_path, MediaPath)
-            self.assertIsInstance(archive.screenshot_path, MediaPath)
-            # Readability empty
-            self.assertIsNone(archive.readability_path)
-            self.assertIsNone(archive.readability_txt_path)
 
-    @wrap_test_db
-    def test_dict(self):
-        with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
-            d = do_archive('https://example.com').dict()
-            self.assertIsInstance(d, dict)
-            json.dumps(d, cls=CustomJSONEncoder)
+@pytest.mark.asyncio
+async def test_dict(test_session):
+    with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
+        d = (await do_archive('https://example.com')).dict()
+        assert isinstance(d, dict)
+        json.dumps(d, cls=CustomJSONEncoder)
 
-    @wrap_test_db
-    def test_relationships(self):
-        with get_db_session(commit=True) as session:
-            url = 'https://wrolpi.org:443'
-            domain = get_or_create_domain(session, url)
-            archive = Archive(
-                singlefile_path=f'{self.tmp_dir.name}/wrolpi.org:443/foo',
-                title='bar',
-                url=url,
-                domain_id=domain.id,
-            )
-            session.add(archive)
-            session.flush()
 
-        self.assertEqual(archive.domain, domain)
+@pytest.mark.asyncio
+async def test_relationships(test_session, test_directory):
+    with get_db_session(commit=True) as session:
+        url = 'https://wrolpi.org:443'
+        domain = get_or_create_domain(session, url)
+        archive = Archive(
+            singlefile_path=f'{test_directory.name}/wrolpi.org:443/foo',
+            title='bar',
+            url=url,
+            domain_id=domain.id,
+        )
+        session.add(archive)
+        session.flush()
 
-    @wrap_test_db
-    def test_validate_paths(self):
-        with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
-            archive = do_archive('https://example.com')
-            try:
-                with get_db_session(commit=True):
-                    archive.singlefile_path = 'asdf'
-            except ValueError as e:
-                self.assertIn('relative', str(e), f'Relative path error was not raised')
+    assert archive.domain == domain
+
+
+@pytest.mark.asyncio
+async def test_validate_paths(test_session):
+    with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
+        archive = await do_archive('https://example.com')
+        try:
+            with get_db_session(commit=True):
+                archive.singlefile_path = 'asdf'
+        except ValueError as e:
+            assert 'relative' in str(e), f'Relative path error was not raised'
 
 
 def test_archive_refresh_deleted_archive(test_session, archive_directory, archive_factory):
@@ -225,10 +223,11 @@ def test_get_domains(test_session, archive_factory):
     assert [i['domain'] for i in get_domains()] == []
 
 
-def test_new_archive(test_session, fake_now):
+@pytest.mark.asycio
+async def test_new_archive(test_session, fake_now):
     with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
         fake_now(datetime(2000, 1, 1))
-        archive1 = do_archive('https://example.com')
+        archive1 = await do_archive('https://example.com')
         # Everything is filled out.
         assert isinstance(archive1, Archive)
         assert archive1.archive_datetime is not None
@@ -251,18 +250,19 @@ def test_new_archive(test_session, fake_now):
             assert json.load(fh) == {'title': 'ジにてこちら', 'url': 'https://example.com'}
 
         fake_now(datetime(2000, 1, 2))
-        archive2 = do_archive('https://example.com')
+        archive2 = await do_archive('https://example.com')
         # Domain is reused.
         assert archive1.domain == archive2.domain
 
 
-def test_get_title_from_html(test_session, fake_now):
+@pytest.mark.asyncio
+async def test_get_title_from_html(test_session, fake_now):
     fake_now(datetime(2000, 1, 1))
     with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
-        archive = do_archive('example.com')
+        archive = await do_archive('example.com')
         assert archive.title == 'ジにてこちら'
 
-    def fake_request_archive(_):
+    async def fake_request_archive(_):
         singlefile = '<html>\ntest single-file\nジにてこちら\n<title>some title</title></html>'
         r = dict(
             content=f'<html>test readability content</html>',
@@ -273,10 +273,10 @@ def test_get_title_from_html(test_session, fake_now):
 
     fake_now(datetime(2000, 1, 2))
     with mock.patch('modules.archive.lib.request_archive', fake_request_archive):
-        archive = do_archive('example.com')
+        archive = await do_archive('example.com')
         assert archive.title == 'some title'
 
-    def fake_request_archive(_):
+    async def fake_request_archive(_):
         singlefile = '<html></html>'
         r = dict(
             content=f'<html>missing a title</html>',
@@ -287,7 +287,7 @@ def test_get_title_from_html(test_session, fake_now):
 
     fake_now(datetime(2000, 1, 3))
     with mock.patch('modules.archive.lib.request_archive', fake_request_archive):
-        archive = do_archive('example.com')
+        archive = await do_archive('example.com')
         assert archive.title is None
 
 
@@ -313,14 +313,15 @@ def test_get_new_archive_files(fake_now):
 
 
 @skip_circleci
-def test_title_in_filename(test_session, fake_now, test_directory):
+@pytest.mark.asyncio
+async def test_title_in_filename(test_session, fake_now, test_directory):
     """
     The Archive files have the title in the path.
     """
     fake_now(datetime(2000, 1, 1))
 
     with mock.patch('modules.archive.lib.request_archive', make_fake_request_archive()):
-        archive1 = do_archive('example.com')
+        archive1 = await do_archive('example.com')
 
     assert archive1.title == 'ジにてこちら'
 
@@ -335,7 +336,7 @@ def test_title_in_filename(test_session, fake_now, test_directory):
     assert str(archive1.screenshot_path.path.relative_to(test_directory)) == \
            'archive/2000-01-01-00-00-00_ジにてこちら.png'
 
-    def fake_request_archive(_):
+    async def fake_request_archive(_):
         singlefile = '<html>\ntest single-file\nジにてこちら\n</html>'  # no title in HTML
         r = dict(
             # No Title from Readability.
@@ -346,7 +347,7 @@ def test_title_in_filename(test_session, fake_now, test_directory):
         return singlefile, r, s
 
     with mock.patch('modules.archive.lib.request_archive', fake_request_archive):
-        archive2 = do_archive('example.com')
+        archive2 = await do_archive('example.com')
 
     assert str(archive2.singlefile_path.path.relative_to(test_directory)) == \
            'archive/2000-01-01-00-00-00_NA.html'
@@ -359,7 +360,7 @@ def test_title_in_filename(test_session, fake_now, test_directory):
     assert str(archive2.screenshot_path.path.relative_to(test_directory)) == \
            'archive/2000-01-01-00-00-00_NA.png'
 
-    def fake_request_archive(_):
+    async def fake_request_archive(_):
         singlefile = '<html>\ntest single-file\nジにてこちら\n<title>dangerous ;\\//_title</html></html>'
         r = dict(
             # No Title from Readability.
@@ -370,7 +371,7 @@ def test_title_in_filename(test_session, fake_now, test_directory):
         return singlefile, r, s
 
     with mock.patch('modules.archive.lib.request_archive', fake_request_archive):
-        archive3 = do_archive('example.com')
+        archive3 = await do_archive('example.com')
 
     assert str(archive3.singlefile_path.path.relative_to(test_directory)) == \
            'archive/2000-01-01-00-00-00_dangerous ;_title.html'
diff --git a/modules/videos/channel/lib.py b/modules/videos/channel/lib.py
index 98c0abe2..2dd9efbe 100644
--- a/modules/videos/channel/lib.py
+++ b/modules/videos/channel/lib.py
@@ -199,4 +199,3 @@ def download_channel(id_: int):
         raise InvalidDownload(f'Channel {channel.name} does not have a download!')
     download.renew(reset_attempts=True)
     session.commit()
-    download_manager.start_downloads()
diff --git a/modules/videos/channel/test/test_api.py b/modules/videos/channel/test/test_api.py
index 04756506..e298f9be 100644
--- a/modules/videos/channel/test/test_api.py
+++ b/modules/videos/channel/test/test_api.py
@@ -6,6 +6,7 @@ from datetime import timedelta
 from http import HTTPStatus
 
 import mock
+import pytest
 
 from modules.videos.channel.lib import delete_channel
 from modules.videos.common import get_no_channel_directory
@@ -108,7 +109,8 @@ def test_channel_no_download_frequency(test_client, test_session, test_directory
     assert response.status_code == HTTPStatus.NO_CONTENT, response.json
 
 
-def test_channel_frequency_update(download_channel, test_client, test_session):
+@pytest.mark.asyncio
+def test_channel_frequency_update(download_channel, test_client, test_session, test_download_manager):
     """
     A Channel's Download record is updated when the Channel's frequency is updated.
     """
@@ -336,8 +338,12 @@ def test_channel_empty_url_doesnt_conflict(test_client, test_session, test_direc
     assert location != response.headers['Location']
 
 
-def test_download_channel_no_refresh(test_session, download_channel, video_download_manager):
+@pytest.mark.asyncio
+async def test_download_channel_no_refresh(test_session, download_channel, video_download_manager):
     """A Channel cannot be downloaded until it has been refreshed."""
+    d = download_channel.get_download()
+    d.next_download = video_download_manager.calculate_next_download(d)
+    test_session.commit()
 
     def check_refreshed(expected: bool):
         channel = test_session.query(Channel).one()
@@ -349,7 +355,8 @@ def test_download_channel_no_refresh(test_session, download_channel, video_downl
     with mock.patch('modules.videos.downloader.YDL.extract_info') as mock_extract_info:
         mock_extract_info.return_value = {'entries': [], 'url': 'foo', 'uploader': 'some uploader',
                                           'channel_id': 'the id', 'id': 'the id'}
-        video_download_manager.do_downloads_sync()
+        await video_download_manager.do_downloads()
+        await video_download_manager.wait_for_all_downloads()
 
     check_refreshed(True)
 
diff --git a/modules/videos/conftest.py b/modules/videos/conftest.py
index ddc4e55f..df2c3e9c 100644
--- a/modules/videos/conftest.py
+++ b/modules/videos/conftest.py
@@ -140,9 +140,7 @@ def video_factory(test_session, test_directory):
 
 @pytest.fixture
 def video_download_manager(test_download_manager) -> DownloadManager:
-    """
-    Get a DownloadManager ready to download Videos and Channels.
-    """
+    """Get a DownloadManager ready to download Videos and Channels."""
     channel_downloader = ChannelDownloader()
     video_downloader = VideoDownloader(priority=40)
 
diff --git a/modules/videos/downloader.py b/modules/videos/downloader.py
index cc439e55..98c95a78 100755
--- a/modules/videos/downloader.py
+++ b/modules/videos/downloader.py
@@ -81,7 +81,7 @@ class ChannelDownloader(Downloader, ABC):
         # A playlist will have an id different from its channel.
         return info['id'] != info['channel_id']
 
-    def do_download(self, download: Download) -> DownloadResult:
+    async def do_download(self, download: Download) -> DownloadResult:
         """Update a Channel's catalog, then schedule downloads of every missing video."""
         info = extract_info(download.url, process=False)
         # Resolve the entries generator.
@@ -142,8 +142,9 @@ YT_DLP_BIN = which(
 
 
 class VideoDownloader(Downloader, ABC):
-    """
-    Download a single video.  Store the video in its channel's directory, otherwise store it in `videos/NO CHANNEL`.
+    """Downloads a single video.
+
+    Store the video in its channel's directory, otherwise store it in `videos/NO CHANNEL`.
     """
     name = 'video'
     pretty_name = 'Videos'
@@ -152,13 +153,9 @@ class VideoDownloader(Downloader, ABC):
         return f'<VideoDownloader>'
 
     @optional_session
-    def already_downloaded(self, url: str, session: Session = None) -> Optional[Video]:
+    def already_downloaded(self, url: str, session: Session = None) -> bool:
         # We only consider a video record with a video file as "downloaded".
-        video = session.query(Video).filter(
-            Video.url == url,
-            Video.video_path != None,
-        ).one_or_none()
-        return video
+        return bool(session.query(Video).filter(Video.url == url, Video.video_path != None, ).count())  # noqa
 
     @classmethod
     def valid_url(cls, url) -> Tuple[bool, Optional[dict]]:
@@ -177,7 +174,7 @@ class VideoDownloader(Downloader, ABC):
         logger.debug(f'{cls.__name__} not suitable for {url}')
         return False, None
 
-    def do_download(self, download: Download) -> DownloadResult:
+    async def do_download(self, download: Download) -> DownloadResult:
         if download.attempts >= 10:
             raise UnrecoverableDownloadError('Max download attempts reached')
 
@@ -226,7 +223,7 @@ class VideoDownloader(Downloader, ABC):
                 '--compat-options', 'no-live-chat',
                 url,
             )
-            return_code, logs = self.process_runner(url, cmd, out_dir)
+            return_code, logs = await self.process_runner(url, cmd, out_dir)
 
             stdout = logs['stdout'].decode() if hasattr(logs['stdout'], 'decode') else logs['stdout']
             stderr = logs['stderr'].decode() if hasattr(logs['stderr'], 'decode') else logs['stderr']
@@ -293,6 +290,7 @@ class VideoDownloader(Downloader, ABC):
 
     @staticmethod
     def prepare_filename(url: str, out_dir: pathlib.Path) -> Tuple[pathlib.Path, dict]:
+        """Get the full path of a video file from its URL."""
         if not out_dir.is_dir():
             raise ValueError(f'Output directory does not exist! {out_dir=}')
 
@@ -300,7 +298,6 @@ class VideoDownloader(Downloader, ABC):
         options = get_downloader_config().dict()
         options['outtmpl'] = f'{out_dir}/{options["file_name_format"]}'
         options['merge_output_format'] = PREFERRED_VIDEO_EXTENSION
-        logger.debug(f'Download video with options: {options}')
 
         logger.debug(f'Downloading {url} to {out_dir}')
 
diff --git a/modules/videos/test/test_downloader.py b/modules/videos/test/test_downloader.py
index 7950f821..6ed78d2e 100644
--- a/modules/videos/test/test_downloader.py
+++ b/modules/videos/test/test_downloader.py
@@ -150,8 +150,9 @@ class TestVideosDownloaders(TestAPI):
         self.assertEqual(self.mgr.get_downloader('https://www.youtube.com/watch?v=31jPEBiAC3c')[0], self.vd)
 
 
-def test_video_download_no_channel(test_session, video_download_manager, video_factory, test_directory,
-                                   mock_video_extract_info, mock_video_process_runner):
+@pytest.mark.asyncio
+async def test_video_download_no_channel(test_session, video_download_manager, video_factory, test_directory,
+                                         mock_video_extract_info, mock_video_process_runner):
     """A video can be downloaded even if it does not have a Channel."""
     channel_dir = test_directory / 'NO CHANNEL'
     channel_dir.mkdir(parents=True)
@@ -168,7 +169,8 @@ def test_video_download_no_channel(test_session, video_download_manager, video_f
     mock_video_extract_info.return_value = info_json
     with mock.patch('modules.videos.downloader.VideoDownloader.prepare_filename') as mock_prepare_filename:
         mock_prepare_filename.return_value = (video_path, {'id': 'foo'})
-        video_download_manager.create_download(url, test_session)
+        video_download_manager.create_download(url)
+        await video_download_manager.wait_for_all_downloads()
 
     mock_video_process_runner.assert_called_once()
 
@@ -176,9 +178,10 @@ def test_video_download_no_channel(test_session, video_download_manager, video_f
     assert str(video.video_path.path) == f'{channel_dir}/video.mp4'
 
 
-def test_download_channel(test_session, simple_channel, video_download_manager, video_file,
-                          mock_video_extract_info, mock_video_prepare_filename,
-                          mock_video_process_runner):
+@pytest.mark.asyncio
+async def test_download_channel(test_session, simple_channel, video_download_manager, video_file,
+                                mock_video_extract_info, mock_video_prepare_filename,
+                                mock_video_process_runner):
     """Downloading (updating the catalog of) a Channel creates download records for all of it's missing videos."""
     url = 'https://www.youtube.com/c/LearningSelfReliance/videos'
 
@@ -186,7 +189,8 @@ def test_download_channel(test_session, simple_channel, video_download_manager,
     mock_video_extract_info.return_value = example_channel_json
     with mock.patch('modules.videos.downloader.get_channel') as mock_get_channel:
         mock_get_channel.return_value = simple_channel
-        video_download_manager.create_download(url, test_session)
+        video_download_manager.create_download(url)
+        await video_download_manager.wait_for_all_downloads()
 
     # Two videos are in the example channel.
     downloads = video_download_manager.get_once_downloads(test_session)
@@ -238,18 +242,22 @@ def test_get_or_create_channel(test_session):
     assert get_or_create_channel(source_id='quux') == channel
 
 
-def test_download_info_save(test_session, video_download_manager, mock_video_extract_info, mock_video_prepare_filename,
-                            mock_video_process_runner):
+@pytest.mark.asyncio
+async def test_download_info_save(test_session, video_download_manager, mock_video_extract_info,
+                                  mock_video_prepare_filename,
+                                  mock_video_process_runner):
     """
     An info dict from Downloader.valid_url is saved to the Downloader and can be used by the Downloader later.
     """
     mock_video_extract_info.return_value = {'some': 'info'}
     mock_video_prepare_filename.return_value = 'some path'
-    video_download_manager.create_download('https://www.youtube.com/watch?v=HQ_62YwcA80', test_session)
+    video_download_manager.create_download('https://www.youtube.com/watch?v=HQ_62YwcA80')
+    await video_download_manager.wait_for_all_downloads()
     assert mock_video_extract_info.call_count == 2  # Only called twice.  The "info" gathering call was skipped.
 
 
-def test_selected_downloader(test_session, video_download_manager, successful_download):
+@pytest.mark.asyncio
+async def test_selected_downloader(test_session, video_download_manager, successful_download):
     """
     A user can specify which Downloader to use, no other should ever be used (even if the Download fails).
     """
@@ -267,7 +275,8 @@ def test_selected_downloader(test_session, video_download_manager, successful_do
     # DownloadManager will attempt to choose the Downloader.
     with mock.patch('modules.videos.downloader.YDL.extract_info') as mock_extract_info:
         mock_extract_info.side_effect = UnsupportedError('not this one')
-        video_download_manager.create_download('https://example.com', test_session)
+        video_download_manager.create_download('https://example.com')
+        await video_download_manager.wait_for_all_downloads()
         mock_http_valid_url.assert_called_once()
         mock_extract_info.assert_called_once()
         mock_do_download.assert_called_once()
@@ -279,7 +288,8 @@ def test_selected_downloader(test_session, video_download_manager, successful_do
 
     # DownloadManager will only use the HTTPDownloader.
     with mock.patch('modules.videos.downloader.YDL.extract_info') as mock_extract_info:
-        video_download_manager.create_download('https://example.com', test_session, downloader='http')
+        video_download_manager.create_download('https://example.com', downloader='http')
+        await video_download_manager.wait_for_all_downloads()
         # DownloadManager does not try to find the Download, it trusts the "downloader" param.
         mock_extract_info.assert_not_called()
         mock_http_valid_url.assert_not_called()
@@ -294,7 +304,8 @@ def test_selected_downloader(test_session, video_download_manager, successful_do
     # DownloadManager will only use the HTTPDownloader, even if the download fails.
     with mock.patch('modules.videos.downloader.YDL.extract_info') as mock_extract_info:
         mock_do_download.side_effect = Exception('oh no!')
-        video_download_manager.create_download('https://example.com', test_session, downloader='http')
+        video_download_manager.create_download('https://example.com', downloader='http')
+        await video_download_manager.wait_for_all_downloads()
         # DownloadManager does not try to find the Download, it trusts the "downloader" param.
         mock_extract_info.assert_not_called()
         mock_http_valid_url.assert_not_called()
@@ -312,12 +323,13 @@ def test_channel_downloader_hidden(video_download_manager):
     assert [i.__json__() for i in downloaders] == [(dict(name='video', pretty_name='Videos')), ]
 
 
+@pytest.mark.asyncio
 def test_bad_downloader(test_session, video_download_manager):
     """
     Attempting to use an unknown downloader should raise an error.
     """
     with pytest.raises(InvalidDownload):
-        video_download_manager.create_download('https://example.com', test_session, 'bad downloader')
+        video_download_manager.create_download('https://example.com', downloader='bad downloader')
 
 
 def test_channel_download_no_download(test_session, video_download_manager, simple_channel):
@@ -332,22 +344,27 @@ def test_channel_download_no_download(test_session, video_download_manager, simp
         download_channel(simple_channel.id)
 
 
-def test_invalid_download_url(test_session, test_download_manager, mock_video_extract_info):
+@pytest.mark.asyncio
+async def test_invalid_download_url(test_session, test_download_manager, mock_video_extract_info):
     """An invalid url should not be attempted again."""
     _, session = get_db_context()
     with mock.patch('modules.videos.downloader.VideoDownloader.valid_url') as mock_valid_url, \
             mock.patch('wrolpi.downloader.DownloadManager.get_downloader') as mock_get_downloader:
-        mock_get_downloader.return_value = (VideoDownloader(), None)
+        video_downloader = VideoDownloader()
+        test_download_manager.register_downloader(video_downloader)
+        mock_get_downloader.return_value = (video_downloader, None)
         mock_valid_url.return_value = (True, {})  # url is valid, but is not a video URL.
         mock_video_extract_info.side_effect = UnsupportedError('oops')
-        test_download_manager.create_download('invalid url', session)
+        test_download_manager.create_download('invalid url', downloader=VideoDownloader.name)
+        await test_download_manager.wait_for_all_downloads()
 
     download = session.query(Download).one()
     assert download.status == 'failed'
 
 
-def test_video_download_1(test_session, test_directory, simple_channel, video_download_manager,
-                          mock_video_process_runner):
+@pytest.mark.asyncio
+async def test_video_download_1(test_session, test_directory, simple_channel, video_download_manager,
+                                mock_video_process_runner):
     simple_channel.source_id = example_video_json['channel_id']
     simple_channel.directory = test_directory / 'videos/channel name'
     simple_channel.directory.mkdir(parents=True)
@@ -361,7 +378,8 @@ def test_video_download_1(test_session, test_directory, simple_channel, video_do
         mock_extract_info.return_value = example_video_json
         mock_prepare_filename.return_value = (video_file, {'id': 'foo'})
 
-        video_download_manager.create_download(url, test_session)
+        video_download_manager.create_download(url)
+        await video_download_manager.wait_for_all_downloads()
 
         mock_video_process_runner.assert_called_once()
         video_url, _, out_dir = mock_video_process_runner.call_args[0]
@@ -374,8 +392,9 @@ def test_video_download_1(test_session, test_directory, simple_channel, video_do
     assert video.video_path.path.is_absolute()
 
 
-def test_download_result(test_session, test_directory, video_download_manager, mock_video_process_runner,
-                         mock_video_extract_info):
+@pytest.mark.asyncio
+async def test_download_result(test_session, test_directory, video_download_manager, mock_video_process_runner,
+                               mock_video_extract_info):
     """VideoDownloader returns a DownloadResult when complete."""
     channel_directory = test_directory / 'videos/channel name'
     channel_directory.mkdir(parents=True)
@@ -385,7 +404,8 @@ def test_download_result(test_session, test_directory, video_download_manager, m
     mock_video_extract_info.return_value = example_video_json
     with mock.patch('modules.videos.downloader.VideoDownloader.prepare_filename') as mock_prepare_filename:
         mock_prepare_filename.return_value = [video_file, {'id': 'foo'}]
-        video_download_manager.create_download('https://example.com', test_session)
+        video_download_manager.create_download('https://example.com')
+        await video_download_manager.wait_for_all_downloads()
 
     download: Download = test_session.query(Download).one()
     assert download.url == 'https://example.com'
@@ -451,7 +471,8 @@ example_playlist_json = {
 }
 
 
-def test_download_playlist(test_session, test_directory, mock_video_extract_info, video_download_manager):
+@pytest.mark.asyncio
+async def test_download_playlist(test_session, test_directory, mock_video_extract_info, video_download_manager):
     """
     All videos in a playlist can be downloaded for it's Channel.
     """
@@ -467,7 +488,7 @@ def test_download_playlist(test_session, test_directory, mock_video_extract_info
 
     with mock.patch('modules.videos.downloader.VideoDownloader.do_download') as mock_video_do_download:
         mock_video_do_download.return_value = DownloadResult(success=True)  # Don't download the videos.
-        result = channel_downloader.do_download(download)
+        result = await channel_downloader.do_download(download)
     assert result.success is True, 'Download was not successful'
     assert set(result.downloads) == {
         'https://youtube.com/watch?v=video_2_url',
diff --git a/requirements.txt b/requirements.txt
index 109d6658..06ab2f28 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,23 +1,23 @@
+Pillow==9.0.1
+Pint==0.18
+PyYAML==5.3.1  # this is the only version available on RPi
+SQLAlchemy==1.3.22
+aiohttp==3.8.1
 alembic==1.7.5
 beautifulsoup4==4.10.0
 cachetools==5.0.0
 feedparser==6.0.9
 mock==4.0.3
-Pillow==9.0.1
-Pint==0.18
 psycopg2-binary==2.9.3
 pytest-asyncio==0.17.2
 pytest==6.2.5
 python-dotenv==0.19.2
 pytz==2021.3
-PyYAML==5.3.1  # this is the only version available on RPi
-requests==2.27.1
 sanic-ext==22.1.2
 sanic-testing==0.8.2
 sanic==21.12.1
 selenium==4.1.0
-SQLAlchemy==1.3.22
 srt==3.5.1
 websockets==10.1
 webvtt-py==0.4.6
-yt-dlp==2022.6.29
+yt-dlp==2022.7.18
diff --git a/wrolpi/common.py b/wrolpi/common.py
index b0e40cd0..317bd3f8 100644
--- a/wrolpi/common.py
+++ b/wrolpi/common.py
@@ -20,6 +20,7 @@ from pathlib import Path
 from typing import Union, Callable, Tuple, Dict, List, Iterable, Optional, Generator, Any
 from urllib.parse import urlunsplit, urlparse
 
+import aiohttp
 import yaml
 from sanic import Blueprint
 from sanic.request import Request
@@ -370,9 +371,7 @@ def set_wrol_mode(enable: bool):
 
 
 def wrol_mode_check(func):
-    """
-    Wraps a function so that it cannot be called when WROL Mode is enabled.
-    """
+    """Wraps a function so that it cannot be called when WROL Mode is enabled."""
 
     @wraps(func)
     def check(*a, **kw):
@@ -786,3 +785,11 @@ def any_extensions(filename: str, extensions: Iterable = ()):
     Matches lower or upper case of the extension.
     """
     return any(filename.lower().endswith(ext) for ext in extensions)
+
+
+async def aiohttp_post(url: str, json_, timeout: int = None) -> Tuple[Dict, int]:
+    """Perform an async aiohttp post request.  Return the json contents."""
+    timeout = aiohttp.ClientTimeout(total=timeout) if timeout else None
+    async with aiohttp.ClientSession(timeout=timeout) as session:
+        async with session.post(url, json=json_) as response:
+            return await response.json(), response.status
diff --git a/wrolpi/conftest.py b/wrolpi/conftest.py
index 47cea0e1..70b5ecdc 100644
--- a/wrolpi/conftest.py
+++ b/wrolpi/conftest.py
@@ -1,6 +1,7 @@
 """
 Fixtures for Pytest tests.
 """
+import asyncio
 import pathlib
 import tempfile
 from typing import Tuple, Set
@@ -121,9 +122,20 @@ def test_download_manager_config(test_directory):
 
 
 @pytest.fixture
-def test_download_manager(test_download_manager_config):
+async def test_download_manager(
+        test_session,  # session is required because downloads can start without the test DB in place.
+        test_download_manager_config,
+):
     manager = DownloadManager()
-    return manager
+    try:
+        loop = asyncio.get_running_loop()
+    except RuntimeError:
+        loop = asyncio.get_event_loop()
+    manager.start_workers(loop=loop)
+
+    yield manager
+
+    manager.cancel_workers()
 
 
 @pytest.fixture
diff --git a/wrolpi/downloader.py b/wrolpi/downloader.py
index 61950a76..4cd1581b 100644
--- a/wrolpi/downloader.py
+++ b/wrolpi/downloader.py
@@ -1,16 +1,17 @@
 import asyncio
 import multiprocessing
 import pathlib
-import subprocess
 import traceback
 from abc import ABC
+from asyncio import Queue, Task, QueueEmpty
 from dataclasses import dataclass, field
 from datetime import timedelta, datetime
 from enum import Enum
 from functools import partial
 from operator import attrgetter
-from typing import List, Dict
+from typing import List, Dict, Generator
 from typing import Tuple, Optional
+from urllib.parse import urlparse
 
 import feedparser
 from feedparser import FeedParserDict
@@ -20,15 +21,12 @@ from sqlalchemy.orm import Session
 
 from wrolpi.common import Base, ModelHelper, logger, wrol_mode_check, zig_zag, ConfigFile, WROLPI_CONFIG
 from wrolpi.dates import TZDateTime, now, Seconds, local_timezone, recursive_replace_tz
-from wrolpi.db import get_db_session, get_db_curs, get_db_context, optional_session
+from wrolpi.db import get_db_session, get_db_curs, optional_session
 from wrolpi.errors import InvalidDownload, UnrecoverableDownloadError
 from wrolpi.vars import PYTEST
 
 logger = logger.getChild(__name__)
 
-DOWNLOAD_IN_PROGRESS = multiprocessing.Semaphore()
-DEFAULT_RETRY_FREQUENCY = timedelta(hours=1)
-
 
 class DownloadFrequency(int, Enum):
     hourly = 3600
@@ -52,7 +50,7 @@ class DownloadResult:
 
 class Download(ModelHelper, Base):
     """Model that is used to schedule downloads."""
-    __tablename__ = 'download'
+    __tablename__ = 'download'  # noqa
     id = Column(Integer, primary_key=True)
     url = Column(String, nullable=False)
 
@@ -66,19 +64,18 @@ class Download(ModelHelper, Base):
     next_download = Column(TZDateTime)
     status = Column(String, default='new')
     sub_downloader = Column(Text)
+    _manager = None
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
-        self.manager: DownloadManager = None
-
     def __repr__(self):
         if self.next_download or self.frequency:
             return f'<Download id={self.id} status={self.status} url={repr(self.url)} ' \
-                   f'next_download={self.next_download} frequency={self.frequency} attempts={self.attempts} ' \
-                   f'error={self.error}>'
+                   f'next_download={repr(self.next_download)} frequency={self.frequency} attempts={self.attempts} ' \
+                   f'error={bool(self.error)}>'
         return f'<Download id={self.id} status={self.status} url={repr(self.url)} attempts={self.attempts} ' \
-               f'error={self.error}>'
+               f'error={bool(self.error)}>'
 
     def __json__(self):
         d = dict(
@@ -126,6 +123,20 @@ class Download(ModelHelper, Base):
 
         return self.manager.get_downloader(self.url)
 
+    @property
+    def domain(self):
+        return urlparse(self.url).netloc
+
+    @property
+    def manager(self):
+        if self._manager:
+            return self._manager
+        raise ValueError('No manager has been set!')
+
+    @manager.setter
+    def manager(self, value):
+        self._manager = value
+
 
 class Downloader:
     name: str = None
@@ -156,11 +167,14 @@ class Downloader:
     def __json__(self):
         return dict(name=self.name, pretty_name=self.pretty_name)
 
+    def __repr__(self):
+        return f'<Downloader name={self.name}>'
+
     @classmethod
     def valid_url(cls, url: str) -> Tuple[bool, Optional[dict]]:
         raise NotImplementedError()
 
-    def do_download(self, download: Download) -> DownloadResult:
+    async def do_download(self, download: Download) -> DownloadResult:
         raise NotImplementedError()
 
     @optional_session
@@ -187,8 +201,8 @@ class Downloader:
         if self._kill.is_set():
             self._kill.clear()
 
-    def process_runner(self, url: str, cmd: Tuple[str, ...], cwd: pathlib.Path, timeout: int = None,
-                       **kwargs) -> Tuple[int, dict]:
+    async def process_runner(self, url: str, cmd: Tuple[str, ...], cwd: pathlib.Path, timeout: int = None,
+                             **kwargs) -> Tuple[int, dict]:
         """
         Run a subprocess using the provided arguments.  This process can be killed by the Download Manager.
 
@@ -196,7 +210,11 @@ class Downloader:
         """
         logger.debug(f'{self} launching download process with args: {" ".join(cmd)}')
         start = now()
-        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=cwd, **kwargs)
+        proc = await asyncio.create_subprocess_exec(*cmd,
+                                                    stdout=asyncio.subprocess.PIPE,
+                                                    stderr=asyncio.subprocess.PIPE,
+                                                    cwd=cwd,
+                                                    **kwargs)
         pid = proc.pid
 
         # Timeout can be any positive integer.  Global download timeout takes precedence, unless it is 0.
@@ -204,37 +222,53 @@ class Downloader:
         timeout = WROLPI_CONFIG.download_timeout or timeout or self.timeout
         logger.debug(f'{self} launched download process {pid=} {timeout=} for {url}')
 
+        stdout, stderr = None, None
         try:
             while True:
-                try:
-                    proc.wait(timeout=1.0)
-                    # Download finished.
+                task = asyncio.Task(proc.communicate())
+                done, pending = await asyncio.wait([task, ], timeout=1)
+                # Cancel communicate.
+                if pending:
+                    pending.pop().cancel()
+                if done:
+                    # Process finished, get the result of proc.communicate().
+                    stdout, stderr = done.pop().result()
+                    break
+                if proc.returncode:
+                    # Process died.
+                    stdout, stderr = await proc.communicate()
                     break
-                except subprocess.TimeoutExpired:
-                    pass
 
-                if timeout and (elapsed := now() - start).total_seconds() > timeout:
+                elapsed = (now() - start).total_seconds()
+                if timeout and elapsed > timeout:
                     logger.warning(f'Download has exceeded its timeout {elapsed=}')
                     self.kill()
 
                 if self._kill.is_set():
-                    logger.warning(f'Killing download {pid=}')
+                    logger.warning(f'Killing download {pid=}, {elapsed} seconds elapsed (timeout was not exceeded).')
                     proc.kill()
-                    proc.poll()
                     break
+        except Exception as e:
+            logger.error(f'{self}.process_runner had a download error', exc_info=e)
+            raise
         finally:
             self.clear()
 
             # Output all logs from the process.
             # TODO is there a way to stream this output while the process is running?
             logger.debug(f'Download exited with {proc.returncode}')
-            stdout, stderr = proc.communicate()
             logs = {'stdout': stdout, 'stderr': stderr}
 
         return proc.returncode, logs
 
 
 class DownloadManager:
+    """
+    Runs a collection of workers which will download any URLs in the `download` table.
+
+    Only one download from each domain will be downloaded at a time.  If we only have one domain (example.com) in the
+    URLs to be downloaded, then only one worker will be busy.
+    """
     priority_sorter = partial(sorted, key=attrgetter('priority'))
 
     def __init__(self):
@@ -242,6 +276,12 @@ class DownloadManager:
         self._instances = dict()
         self.disabled = multiprocessing.Event()
         self.stopped: bool = False
+        self.download_queue: Queue = Queue()
+        self.workers: List[Task] = []
+        self.worker_count: int = 4
+        self.data = multiprocessing.Manager().dict()
+        # We haven't started downloads yet, so no domains are downloading.
+        self.data['processing_domains'] = []
 
     def register_downloader(self, instance: Downloader):
         if not isinstance(instance, Downloader):
@@ -255,6 +295,132 @@ class DownloadManager:
         self.instances = tuple(self.priority_sorter(i))
         self._instances[instance.name] = instance
 
+    async def download_worker(self, num: int, queue: Queue):
+        """Fetch a download from the queue, perform the download then store the results.
+
+        Calls DownloadManger.start_downloads() after a download completes.
+        """
+        logger.debug(f'DownloadManager.download_worker {num} starting up')
+        from wrolpi.db import get_db_session
+
+        while True:
+            if self.stopped:
+                return
+
+            try:
+                download: Download = queue.get_nowait()
+                download_id, url = download.id, download.url
+                logger.debug(f'Download worker {num} got download {download}')
+
+                downloader: Downloader = download.get_downloader()
+                if not downloader:
+                    logger.warning(f'Could not find downloader for {download.downloader=}')
+
+                with get_db_session(commit=True) as session:
+                    # Mark the download as started in new session so the change is committed.
+                    download = session.query(Download).filter_by(id=download_id).one()
+                    download.started()
+
+                self.data['processing_domains'].append(download.domain)
+
+                try_again = True
+                try:
+                    if asyncio.iscoroutinefunction(downloader.do_download):
+                        result = await downloader.do_download(download)
+                    else:
+                        result = downloader.do_download(download)
+                except UnrecoverableDownloadError as e:
+                    # Download failed and should not be retried.
+                    logger.warning(f'UnrecoverableDownloadError for {url}', exc_info=e)
+                    result = DownloadResult(success=False, error=str(traceback.format_exc()))
+                    try_again = False
+                except Exception as e:
+                    logger.warning(f'Failed to download {url}.  Will be tried again later.', exc_info=e)
+                    result = DownloadResult(success=False, error=str(traceback.format_exc()))
+
+                error_len = len(result.error) if result.error else 0
+                logger.debug(f'Got success={result.success} from {downloader} with {error_len=}')
+
+                with get_db_session(commit=True) as session:
+                    # Modify the download in a new session because downloads may take a long time.
+                    download = session.query(Download).filter_by(id=download_id).one()
+                    # Use a new location if provided, keep the old location if no new location is provided, otherwise
+                    # clear out an outdated location.
+                    download.location = result.location or download.location or None
+                    # Clear any old errors if the download succeeded.
+                    download.error = result.error if result.error else None
+                    download.next_download = self.calculate_next_download(download, session)
+
+                    if result.downloads:
+                        logger.info(f'Adding {len(result.downloads)} downloads from result of {download.url}')
+                        self.create_downloads(result.downloads, session,
+                                              downloader=download.sub_downloader)
+
+                    if try_again is False and not download.frequency:
+                        # Only once-downloads can fail.
+                        download.fail()
+                    elif result.success:
+                        download.complete()
+                    else:
+                        download.defer()
+
+                queue.task_done()
+                # Remove this domain from the running list.
+                self._remove_domain(download.domain)
+                # Request any new downloads be added to the queue.
+                asyncio.create_task(self.queue_downloads())
+            except asyncio.CancelledError:
+                logger.warning(f'download_worker canceled!')
+                queue.task_done()
+                return
+            except QueueEmpty:
+                # No work yet.
+                await asyncio.sleep(0.1)
+                continue
+            except Exception as e:
+                logger.warning(f'Download worker had unexpected error', exc_info=e)
+
+    def _add_domain(self, domain: str):
+        """Add a domain to the processing list.
+
+        Raises ValueError if the domain is already processing."""
+        processing_domains = self.data['processing_domains']
+        if domain in processing_domains:
+            raise ValueError(f'Domain already being downloaded! {domain}')
+        self.data['processing_domains'] = [*processing_domains, domain]
+
+    def _remove_domain(self, domain: str):
+        """Remove a domain from the processing list."""
+        self.data['processing_domains'] = [i for i in self.data['processing_domains'] if i != domain]
+
+    @wrol_mode_check
+    def start_workers(self, loop=None):
+        """Start all download worker tasks.  Does nothing if they are already running."""
+        if not self.workers:
+            if not loop:
+                try:
+                    loop = asyncio.get_running_loop()
+                except RuntimeError:
+                    # Loop isn't running, start one.  Probably testing.
+                    loop = asyncio.get_event_loop()
+
+            logger.debug(f'Starting {self.worker_count} download workers')
+            for i in range(self.worker_count):
+                coro = self.download_worker(i, self.download_queue)
+                task = loop.create_task(coro)
+                self.workers.append(task)
+
+    def workers_running(self):
+        for task in self.workers:
+            if not task.done():
+                return True
+        return False
+
+    def cancel_workers(self):
+        if self.workers_running():
+            for task in self.workers:
+                task.cancel()
+
     def get_downloader(self, url: str) -> Tuple[Downloader, Dict]:
         for i in self.instances:
             valid, info = i.valid_url(url)
@@ -262,29 +428,10 @@ class DownloadManager:
                 return i, info
         raise InvalidDownload(f'Invalid URL {url=}')
 
-    def get_downloader_by_name(self, name: str) -> Downloader:
-        """
-        Tries to find a registered Downloader by its name.  Returns None if it cannot be found.
-        """
+    def get_downloader_by_name(self, name: str) -> Optional[Downloader]:
+        """Attempt to find a registered Downloader by its name.  Returns None if it cannot be found."""
         return self._instances.get(name)
 
-    def get_new_downloads(self, session: Session) -> List[Download]:
-        """
-        Get all "new" downloads.  This method fetches the first download each iteration, so it will fetch downloads
-        that were created after calling it.
-        """
-        last = None
-        while True:
-            download = session.query(Download).filter_by(status='new').order_by(Download.id).first()
-            if not download:
-                return
-            if download == last:
-                # Got the last download again.  Is something wrong?
-                return
-            last = download
-            download.manager = self
-            yield download
-
     def get_or_create_download(self, url: str, session: Session) -> Download:
         """Get a Download by its URL, if it cannot be found create one."""
         if not url:
@@ -301,159 +448,136 @@ class DownloadManager:
         download.manager = self
         return download
 
-    def create_download(self, url: str, session, downloader: str = None, skip_download: bool = False,
-                        reset_attempts: bool = False, sub_downloader: str = None) -> Download:
+    @optional_session
+    def create_download(self, url: str, session: Session = None, downloader: str = None, reset_attempts: bool = False,
+                        sub_downloader: str = None) -> Download:
         """Schedule a URL for download.  If the URL failed previously, it may be retried."""
-        downloads = self.create_downloads([url], session, downloader, skip_download=skip_download,
+        downloads = self.create_downloads([url], session=session, downloader=downloader,
                                           reset_attempts=reset_attempts, sub_downloader=sub_downloader)
         return downloads[0]
 
-    def create_downloads(self, urls: List[str], session: Session = None, downloader_name: str = None,
-                         skip_download: bool = False, reset_attempts: bool = False, sub_downloader: str = None) \
+    @optional_session
+    def create_downloads(self, urls: List[str], session: Session = None, downloader: str = None,
+                         reset_attempts: bool = False, sub_downloader: str = None) \
             -> List[Download]:
         """Schedule all URLs for download.  If one cannot be downloaded, none will be added."""
-        if not session:
-            _, session = get_db_context()
+        if not all(urls):
+            raise ValueError('Download must have a URL')
 
         downloads = []
-        downloader = self.get_downloader_by_name(downloader_name) if downloader_name else None
-        if downloader_name and not downloader:
-            # Could not find the downloader
-            raise InvalidDownload(f'Unknown downloader {downloader_name}')
+        shared_downloader = self.get_downloader_by_name(downloader) if downloader else None
+        if downloader and not shared_downloader:
+            # Could not look up the downloader.
+            raise InvalidDownload(f'Unknown downloader {downloader}')
 
         with session.transaction:
             for url in urls:
-                if not url:
-                    raise ValueError('Download must have a URL')
                 if url in DOWNLOAD_MANAGER_CONFIG.skip_urls and reset_attempts:
                     # User manually entered this download, remove it from the skip list.
-                    DOWNLOAD_MANAGER_CONFIG.skip_urls = [i for i in DOWNLOAD_MANAGER_CONFIG.skip_urls if i != url]
-                    DOWNLOAD_MANAGER_CONFIG.save()
+                    self.remove_from_skip_list(url)
                 elif url in DOWNLOAD_MANAGER_CONFIG.skip_urls:
                     logger.warning(f'Skipping {url} because it is in the download_manager.yaml skip list.')
                     continue
                 info_json = None
-                if not downloader:
+                if not shared_downloader:
                     # User has requested automatic downloader selection, try and find it.
-                    downloader_, info_json = self.get_downloader(url)
+                    local_downloader, info_json = self.get_downloader(url)
                 else:
-                    downloader_ = downloader
+                    # One Downloader provided for all URLs, use it.
+                    local_downloader = shared_downloader
 
                 download = self.get_or_create_download(url, session)
                 # Download may have failed, try again.
                 download.renew(reset_attempts=reset_attempts)
-                download.downloader = downloader_.name
+                download.downloader = local_downloader.name
                 download.info_json = info_json or download.info_json
                 download.sub_downloader = sub_downloader
                 downloads.append(download)
 
-        if skip_download is True:
-            return downloads
-
-        if PYTEST:
-            # Download now (for testing).
-            self._do_downloads(session)
-        else:
-            # Start downloading ASAP.
-            self.start_downloads()
+        # Start downloading ASAP.
+        try:
+            asyncio.create_task(self.queue_downloads())
+        except RuntimeError:
+            # Event loop isn't running.  Probably testing?
+            if not PYTEST:
+                logger.info(f'Unable to queue downloads after creating {len(downloads)} download(s).')
 
         return downloads
 
+    def recurring_download(self, url: str, frequency: int, downloader: str = None,
+                           sub_downloader: str = None, reset_attempts: bool = False) -> Download:
+        """Schedule a recurring download."""
+        if not frequency:
+            raise ValueError('Recurring download must have a frequency!')
+
+        with get_db_session(commit=True) as session:
+            download, = self.create_downloads([url, ], session=session, downloader=downloader,
+                                              sub_downloader=sub_downloader, reset_attempts=reset_attempts)
+            download.frequency = frequency
+
+        return download
+
     @wrol_mode_check
     @optional_session
-    def _do_downloads(self, session: Session = None):
-        """This method calls the Downloader's do_download method."""
+    async def queue_downloads(self, session: Session = None):
+        """Put all downloads in queue.  Will only queue downloads if there are workers to take them.  Each worker
+        only receives one domain, this is to prevent downloading from one domain many times at once."""
         if self.disabled.is_set():
             raise InvalidDownload('DownloadManager is disabled')
 
-        try:
-            downloads = self.get_new_downloads(session)
-
-            download_count = 0
-            for download in downloads:
-                if self.disabled.is_set():
-                    raise InvalidDownload('DownloadManager is disabled')
-                if self.stopped:
-                    return
-
-                download_count += 1
-                download_id = download.id
-                url = download.url
-
-                if url in DOWNLOAD_MANAGER_CONFIG.skip_urls:
-                    logger.info(f'Skipping download in skip_urls list: {url}')
-                    session.query(Download).filter_by(id=download.id).delete()
-                    session.commit()
-                    continue
-
-                downloader = self.get_downloader_by_name(download.downloader)
-                if not downloader:
-                    downloader, info_json = self.get_downloader(download.url)
-                    download.downloader = downloader.name
-                    download.info_json = info_json
-                downloader.clear()
-
-                download.started()
-                session.commit()
-
-                try_again = True
-                try:
-                    result = downloader.do_download(download)
-                except UnrecoverableDownloadError as e:
-                    # Download failed and should not be retried.
-                    logger.warning(f'UnrecoverableDownloadError for {url}', exc_info=e)
-                    result = DownloadResult(success=False, error=str(traceback.format_exc()))
-                    try_again = False
-                except Exception as e:
-                    logger.warning(f'Failed to download {url}.  Will be tried again later.', exc_info=e)
-                    result = DownloadResult(success=False, error=str(traceback.format_exc()))
-
-                error_len = len(result.error) if result.error else 0
-                logger.debug(f'Got success={result.success} from {downloader} with {error_len=}')
-
-                # Long-running, get the download again.
-                with get_db_session(commit=True) as session_:
-                    download = self.get_download(session_, id_=download_id)
-                    # Use a new location if provided, keep the old location if no new location is provided, otherwise
-                    # clear out an outdated location.
-                    download.location = result.location or download.location or None
-                    # Clear any old errors if the download succeeded.
-                    download.error = result.error if result.error else None
-                    download.next_download = self.calculate_next_download(download, session)
-
-                    if result.downloads:
-                        logger.info(f'Adding {len(result.downloads)} downloads from result of {download.url}')
-                        self.create_downloads(result.downloads, session_, downloader_name=download.sub_downloader)
-
-                    if try_again is False:
-                        download.fail()
-                    elif result.success:
-                        download.complete()
-                    else:
-                        download.defer()
-
-            if download_count:
-                logger.info(f'Done doing {download_count} downloads.')
-        finally:
-            session.close()
-
-    def do_downloads_sync(self):
-        acquired = DOWNLOAD_IN_PROGRESS.acquire(block=False)
-        if not acquired:
+        if len(self.data['processing_domains']) >= len(self.workers):
             return
 
-        try:
-            self._do_downloads()
-        finally:
-            DOWNLOAD_IN_PROGRESS.release()
+        # Find download whose domain isn't already being downloaded.
+        new_downloads = session.query(Download).filter(
+            Download.status == 'new',
+            Download.domain not in self.data['processing_domains'],
+        ).order_by(Download.id)  # noqa
+        count = 0
+        for download in new_downloads:
+            download.manager = self  # Assign this Download to this manager.
+            domain = download.domain
+            if domain not in self.data['processing_domains']:
+                self._add_domain(domain)
+                await self.download_queue.put(download)
+                count += 1
+        if count:
+            logger.debug(f'Added {count} downloads to queue.')
 
     async def do_downloads(self):
-        return self.do_downloads_sync()
+        """Schedule any downloads that are new.
 
-    def start_downloads(self):
-        """Start an async task to do downloads.  This does nothing when testing!"""
-        if not PYTEST:
-            asyncio.create_task(self.do_downloads())
+        Warning: Downloads will still be running even after this returns!  See `wait_for_all_downloads`.
+        """
+        if self.disabled.is_set():
+            return
+        self.renew_recurring_downloads()
+        self.delete_old_once_downloads()
+        await self.queue_downloads()
+
+    async def wait_for_all_downloads(self):
+        """Wait for all Downloads in queue AND any new Downloads to complete.
+
+        THIS METHOD IS FOR TESTING.
+        """
+        while True:
+            await asyncio.sleep(0.1)
+
+            if not self.workers_running():
+                raise ValueError('No workers are running!')
+
+            await self.queue_downloads()
+
+            try:
+                next(self.get_new_downloads())
+                continue
+            except StopIteration:
+                pass
+
+            if self.download_queue.empty():
+                # Queue is empty.
+                break
+        await self.download_queue.join()
 
     @staticmethod
     def reset_downloads():
@@ -461,23 +585,26 @@ class DownloadManager:
         with get_db_curs(commit=True) as curs:
             curs.execute("UPDATE download SET status='new' WHERE status='pending' OR status='deferred'")
 
-    def recurring_download(self, url: str, frequency: int, skip_download: bool = False, downloader: str = None,
-                           sub_downloader: str = None, reset_attempts: bool = False) -> Download:
-        """Schedule a recurring download."""
-        with get_db_session(commit=True) as session:
-            download = self.create_download(url, session=session, skip_download=True, downloader=downloader,
-                                            sub_downloader=sub_downloader, reset_attempts=reset_attempts)
-            download.frequency = frequency
-
-        if skip_download is False and PYTEST:
-            self.do_downloads_sync()
-        elif skip_download is False:
-            self.start_downloads()
-
-        return download
-
     DOWNLOAD_SORT = ('pending', 'failed', 'new', 'deferred', 'complete')
 
+    @optional_session
+    def get_new_downloads(self, session: Session) -> Generator[Download, None, None]:
+        """
+        Get all "new" downloads.  This method fetches the first download each iteration, so it will fetch downloads
+        that were created after calling it.
+        """
+        last = None
+        while True:
+            download = session.query(Download).filter_by(status='new').order_by(Download.id).first()
+            if not download:
+                return
+            if download == last:
+                # Got the last download again.  Is something wrong?
+                return
+            last = download
+            download.manager = self
+            yield download
+
     @optional_session
     def get_recurring_downloads(self, session: Session = None, limit: int = None):
         """Get all Downloads that will be downloaded in the future."""
@@ -519,11 +646,7 @@ class DownloadManager:
                 renewed = True
 
         if renewed:
-            logger.debug('Renewed recurring downloads')
             session.commit()
-            self.start_downloads()
-        else:
-            logger.debug('No recurring downloads to renew')
 
     def get_downloads(self, session: Session) -> List[Download]:
         downloads = list(session.query(Download).all())
@@ -566,11 +689,13 @@ class DownloadManager:
 
     def stop(self):
         """Stop all Downloaders, defer all pending downloads."""
+        logger.warning('Stopping all downloads')
         self.stopped = True
         for downloader in self.instances:
             downloader.kill()
         for download in self.get_pending_downloads():
             download.defer()
+        self.cancel_workers()
 
     def kill(self):
         """Kill all downloads.  Do not start new downloads."""
@@ -582,15 +707,19 @@ class DownloadManager:
 
     def enable(self):
         """Enable downloading.  Start downloading."""
+        logger.info('Enabling downloading')
+        for downloader in self.instances:
+            downloader.clear()
         self.disabled.clear()
-        self.start_downloads()
+        self.start_workers()
+        asyncio.create_task(self.do_downloads())
 
     FINISHED_STATUSES = ('complete', 'failed')
 
     def delete_old_once_downloads(self):
-        """
-        Delete all once-downloads that have expired.  Do not delete downloads that are new, or should be tried again.
-        """
+        """Delete all once-downloads that have expired.
+
+        Do not delete downloads that are new, or should be tried again."""
         with get_db_session(commit=True) as session:
             downloads = self.get_once_downloads(session)
             one_month = now() - timedelta(days=30)
@@ -674,8 +803,9 @@ class DownloadManager:
             download.manager = self
         return downloads
 
+    @staticmethod
     @optional_session
-    def calculate_next_download(self, download: Download, session: Session) -> Optional[datetime]:
+    def calculate_next_download(download: Download, session: Session) -> Optional[datetime]:
         """
         If the download is "deferred", download soon.  But, slowly increase the time between attempts.
 
@@ -738,13 +868,22 @@ class DownloadManager:
 
         # Add all downloads to permanent skip list.
         ids = [i.id for i in failed_downloads]
-        urls = list(set(DOWNLOAD_MANAGER_CONFIG.skip_urls) | {i.url for i in failed_downloads})
-        DOWNLOAD_MANAGER_CONFIG.skip_urls = urls
+        self.add_to_skip_list(*(i.url for i in failed_downloads))
 
         # Delete all failed once-downloads.
         session.execute('DELETE FROM download WHERE id = ANY(:ids)', {'ids': ids})
         session.commit()
 
+    @staticmethod
+    def add_to_skip_list(*urls: str):
+        DOWNLOAD_MANAGER_CONFIG.skip_urls = list(set(DOWNLOAD_MANAGER_CONFIG.skip_urls) | set(urls))
+        DOWNLOAD_MANAGER_CONFIG.save()
+
+    @staticmethod
+    def remove_from_skip_list(url: str):
+        DOWNLOAD_MANAGER_CONFIG.skip_urls = [i for i in DOWNLOAD_MANAGER_CONFIG.skip_urls if i != url]
+        DOWNLOAD_MANAGER_CONFIG.save()
+
 
 # The global DownloadManager.  This should be used everywhere!
 download_manager = DownloadManager()
@@ -824,14 +963,12 @@ class RSSDownloader(Downloader, ABC):
                 logger.warning(f'RSS entry {idx} did not have a link!')
 
         session = Session.object_session(download)
-        self.manager.create_downloads(urls, session=session, downloader_name=download.sub_downloader)
+        self.manager.create_downloads(urls, session=session, downloader=download.sub_downloader)
         return DownloadResult(success=True)
 
     @staticmethod
     def acceptable_bozo_errors(feed):
-        """
-        Feedparser can report some errors, some we can ignore.
-        """
+        """Feedparser can report some errors, some we can ignore."""
         if 'document declared as' in str(feed['bozo_exception']):
             # Feed's encoding does not match what is declared, this is fine.
             return True
diff --git a/wrolpi/root_api.py b/wrolpi/root_api.py
index d481a1fc..f672e0a3 100644
--- a/wrolpi/root_api.py
+++ b/wrolpi/root_api.py
@@ -13,7 +13,6 @@ from sanic import Sanic, response, Blueprint, __version__ as sanic_version
 from sanic.blueprint_group import BlueprintGroup
 from sanic.request import Request
 from sanic.response import HTTPResponse
-from sanic.signals import Event
 from sanic_ext import validate
 from sanic_ext.extensions.openapi import openapi
 
@@ -26,7 +25,7 @@ from wrolpi.downloader import download_manager
 from wrolpi.errors import WROLModeEnabled, InvalidTimezone, API_ERRORS, APIError, ValidationError, HotspotError
 from wrolpi.media_path import MediaPath
 from wrolpi.schema import RegexRequest, RegexResponse, SettingsRequest, SettingsResponse, DownloadRequest, EchoResponse
-from wrolpi.vars import DOCKERIZED, PYTEST
+from wrolpi.vars import DOCKERIZED
 from wrolpi.version import __version__
 
 logger = logger.getChild(__name__)
@@ -210,7 +209,7 @@ async def post_download(_: Request, body: DownloadRequest):
         download_manager.recurring_download(urls[0], body.frequency, downloader=downloader,
                                             sub_downloader=body.sub_downloader, reset_attempts=True)
     else:
-        download_manager.create_downloads(urls, downloader_name=downloader, sub_downloader=body.sub_downloader,
+        download_manager.create_downloads(urls, downloader=downloader, sub_downloader=body.sub_downloader,
                                           reset_attempts=True)
     return response.empty()
 
@@ -376,10 +375,3 @@ def json_error_handler(request, exception: Exception):
 
 
 api_app.error_handler.add(APIError, json_error_handler)
-
-
-@api_app.signal(Event.SERVER_SHUTDOWN_BEFORE)
-def handle_server_shutdown(*args, **kwargs):
-    """Stop downloads when server is shutting down."""
-    if not PYTEST:
-        download_manager.stop()
diff --git a/wrolpi/test/common.py b/wrolpi/test/common.py
index 344ee401..6fa03feb 100644
--- a/wrolpi/test/common.py
+++ b/wrolpi/test/common.py
@@ -10,7 +10,6 @@ from typing import List
 
 import mock
 import pytest
-from requests import Response
 
 from wrolpi.common import set_test_media_directory, get_media_directory
 from wrolpi.conftest import ROUTES_ATTACHED, test_db, test_client  # noqa
@@ -128,7 +127,7 @@ class TestAPI(ExtendedTestCase):
     def tearDown(self) -> None:
         set_test_media_directory(None)
 
-    def assertHTTPStatus(self, response: Response, status: int):
+    def assertHTTPStatus(self, response, status: int):
         self.assertEqual(response.status_code, status)
 
     assertOK = partialmethod(assertHTTPStatus, status=HTTPStatus.OK)
diff --git a/wrolpi/test/test_db.py b/wrolpi/test/test_db.py
index 8d2d43ca..821c9188 100644
--- a/wrolpi/test/test_db.py
+++ b/wrolpi/test/test_db.py
@@ -35,13 +35,3 @@ def test_optional_session(test_session):
     func(session=test_session)
     func(test_session)
 
-
-def test_test_session_is_required():
-    """
-    fixture `test_session` must be used in all tests to avoid using the real database.
-    """
-    try:
-        with get_db_session() as session:
-            raise Exception('test engine was not used!!')
-    except ValueError as e:
-        assert 'test database' in str(e)
diff --git a/wrolpi/test/test_downloader.py b/wrolpi/test/test_downloader.py
index 6e3423dd..8fdd773f 100644
--- a/wrolpi/test/test_downloader.py
+++ b/wrolpi/test/test_downloader.py
@@ -1,12 +1,14 @@
+import asyncio
 from abc import ABC
 from datetime import datetime
 from itertools import zip_longest
+from typing import Tuple, Optional
 from unittest import mock
 from unittest.mock import MagicMock
 
 import pytest
 
-from wrolpi.dates import local_timezone, Seconds
+from wrolpi.dates import local_timezone, Seconds, now
 from wrolpi.db import get_db_context
 from wrolpi.downloader import Downloader, Download, DownloadFrequency, DownloadResult
 from wrolpi.errors import UnrecoverableDownloadError, InvalidDownload, WROLModeEnabled
@@ -35,6 +37,7 @@ class HTTPDownloader(Downloader):
         return url.startswith('https://') or url.startswith('http://'), None
 
 
+@pytest.mark.asyncio
 def test_register_downloader(test_session, test_download_manager):
     """Downloaders can be registered and have specific priorities."""
     assert test_download_manager.instances == tuple()
@@ -54,84 +57,39 @@ def test_register_downloader(test_session, test_download_manager):
         test_download_manager.register_downloader(permissive_downloader)
 
 
-def test_do_downloads(test_session, test_download_manager):
-    _, session = get_db_context()
-
-    http_downloader = HTTPDownloader()
-    http_downloader.do_download = MagicMock()
-    http_downloader.do_download.return_value = DownloadResult(success=True)
-    test_download_manager.register_downloader(http_downloader)
-
-    permissive_downloader = PermissiveDownloader(priority=100)
-    permissive_downloader.do_download = MagicMock()
-    permissive_downloader.do_download.return_value = DownloadResult(success=False)
-    test_download_manager.register_downloader(permissive_downloader)
-
-    # https is handled by the HTTP Downloader.
-    test_download_manager.create_download('https://example.com', session)
-    http_downloader.do_download.assert_called_once()
-    permissive_downloader.do_download.assert_not_called()
-    assert test_download_manager.get_download(session, 'https://example.com') is not None
-
-    http_downloader.do_download.reset_mock()
-
-    # try the permissive download, which returns a failure.
-    test_download_manager.create_download('foo', session)
-    http_downloader.do_download.assert_not_called()
-    permissive_downloader.do_download.assert_called_once()
-    download = test_download_manager.get_download(session, 'foo')
-    assert download.attempts == 1
-
-    # try again
-    test_download_manager.create_download('foo', session)
-    test_download_manager._do_downloads(session)
-    download = test_download_manager.get_download(session, 'foo')
-    assert download.attempts == 2
-
-    # finally success
-    permissive_downloader.do_download.return_value = DownloadResult(success=True)
-    test_download_manager.create_download('foo', session)
-    test_download_manager._do_downloads(session)
-    download = test_download_manager.get_download(session, 'foo')
-    assert download.status == 'complete'
-
-    # No downloads left.
-    assert list(test_download_manager.get_new_downloads(session)) == []
-
-
-def test_delete_old_once_downloads(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_delete_old_once_downloads(test_session, test_download_manager):
     """Once-downloads over a month old should be deleted."""
     with mock.patch('wrolpi.downloader.now') as mock_now:
         mock_now.return_value = local_timezone(datetime(2020, 6, 5, 0, 0))
         permissive_downloader = PermissiveDownloader(priority=0)
         test_download_manager.register_downloader(permissive_downloader)
 
-        _, session = get_db_context()
         # Recurring downloads should not be deleted.
-        d1 = test_download_manager.create_download('https://example.com/1', session, skip_download=True)
-        d2 = test_download_manager.create_download('https://example.com/2', session, skip_download=True)
+        d1 = test_download_manager.create_download('https://example.com/1')
+        d2 = test_download_manager.create_download('https://example.com/2')
         d1.frequency = 1
         d2.frequency = 1
         d2.started()
         # Should be deleted.
-        d3 = test_download_manager.create_download('https://example.com/3', session, skip_download=True)
-        d4 = test_download_manager.create_download('https://example.com/4', session, skip_download=True)
+        d3 = test_download_manager.create_download('https://example.com/3')
+        d4 = test_download_manager.create_download('https://example.com/4')
         d3.complete()
         d4.complete()
         d3.last_successful_download = local_timezone(datetime(2020, 1, 1, 0, 0, 0))
         d4.last_successful_download = local_timezone(datetime(2020, 5, 1, 0, 0, 0))
         # Not a month old.
-        d5 = test_download_manager.create_download('https://example.com/5', session, skip_download=True)
+        d5 = test_download_manager.create_download('https://example.com/5')
         d5.last_successful_download = local_timezone(datetime(2020, 6, 1, 0, 0, 0))
         # An old, but pending download should not be deleted.
-        d6 = test_download_manager.create_download('https://example.com/6', session, skip_download=True)
+        d6 = test_download_manager.create_download('https://example.com/6')
         d6.last_successful_download = local_timezone(datetime(2020, 4, 1, 0, 0, 0))
         d6.started()
 
         test_download_manager.delete_old_once_downloads()
 
         # Two old downloads are deleted.
-        downloads = session.query(Download).order_by(Download.id).all()
+        downloads = test_session.query(Download).order_by(Download.id).all()
         expected = [
             dict(url='https://example.com/1', frequency=1, attempts=0, status='new'),
             dict(url='https://example.com/2', frequency=1, attempts=1, status='pending'),
@@ -142,7 +100,8 @@ def test_delete_old_once_downloads(test_session, test_download_manager):
             assert_dict_contains(download.dict(), expected)
 
 
-def test_ensure_download(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_ensure_download(test_session, test_download_manager):
     assert len(test_download_manager.get_downloads(test_session)) == 0
 
     http_downloader = HTTPDownloader()
@@ -150,7 +109,7 @@ def test_ensure_download(test_session, test_download_manager):
     http_downloader.do_download.return_value = DownloadResult(success=True)
     test_download_manager.register_downloader(http_downloader)
 
-    test_download_manager.create_download('https://example.com', test_session)
+    test_download_manager.create_download('https://example.com')
     download = test_download_manager.get_download(test_session, 'https://example.com')
     assert download.url == 'https://example.com'
 
@@ -159,19 +118,20 @@ def test_ensure_download(test_session, test_download_manager):
     assert test_download_manager.get_download(test_session, 'https://example.com/not downloading') is None
 
 
-def test_create_downloads(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_create_downloads(test_session, test_download_manager):
     """Multiple downloads can be scheduled using DownloadManager.create_downloads."""
     http_downloader = HTTPDownloader(priority=0)
     test_download_manager.register_downloader(http_downloader)
 
     # Both URLs are valid and are scheduled.
-    test_download_manager.create_downloads(['https://example.com/1', 'https://example.com/2'], skip_download=True)
+    test_download_manager.create_downloads(['https://example.com/1', 'https://example.com/2'])
     downloads = test_download_manager.get_downloads(test_session)
     assert {i.url for i in downloads} == {'https://example.com/1', 'https://example.com/2'}
 
     # One URL is bad, neither should be scheduled.
     with pytest.raises(InvalidDownload):
-        test_download_manager.create_downloads(['https://example.com/3', 'bad url should fail'], skip_download=True)
+        test_download_manager.create_downloads(['https://example.com/3', 'bad url should fail'])
 
     downloads = test_download_manager.get_downloads(test_session)
     assert {i.url for i in downloads} == {'https://example.com/1', 'https://example.com/2'}
@@ -195,12 +155,13 @@ def test_downloader_must_have_name():
 @pytest.mark.asyncio
 async def test_download_wrol_mode(test_session, test_download_manager):
     with pytest.raises(WROLModeEnabled):
-        test_download_manager.do_downloads_sync()
+        await test_download_manager.do_downloads()
     with pytest.raises(WROLModeEnabled):
-        await test_download_manager.do_downloads_sync()
+        await test_download_manager.do_downloads()
 
 
-def test_download_get_downloader(test_session, test_download_manager, ):
+@pytest.mark.asyncio
+async def test_download_get_downloader(test_session, test_download_manager):
     """
     A Download can find it's Downloader.
     """
@@ -209,14 +170,15 @@ def test_download_get_downloader(test_session, test_download_manager, ):
     test_download_manager.register_downloader(permissive_downloader)
     test_download_manager.register_downloader(http_downloader)
 
-    download1 = test_download_manager.create_download('https://example.com', test_session, skip_download=True)
+    download1 = test_download_manager.create_download('https://example.com')
     assert download1.get_downloader() == permissive_downloader
 
-    download2 = test_download_manager.create_download('https://example.com', test_session, skip_download=True)
+    download2 = test_download_manager.create_download('https://example.com')
     download2.downloader = 'bad downloader'
     assert download2.get_downloader() is None
 
 
+@pytest.mark.asyncio
 def test_calculate_next_download(test_session, test_download_manager, fake_now):
     fake_now(datetime(2000, 1, 1))
     download = Download()
@@ -249,79 +211,78 @@ def test_calculate_next_download(test_session, test_download_manager, fake_now):
     assert test_download_manager.calculate_next_download(d3) == local_timezone(datetime(2000, 1, 9, 18))
 
 
-def test_recurring_downloads(test_session, test_download_manager, fake_now):
-    """
-    A recurring Download should be downloaded repeatedly forever.
-    """
-    _, session = get_db_context()
-
+@pytest.mark.asyncio
+async def test_recurring_downloads(test_session, test_download_manager, fake_now):
+    """A recurring Download should be downloaded forever."""
     http_downloader = HTTPDownloader()
     http_downloader.do_download = MagicMock()
     http_downloader.do_download.return_value = DownloadResult(success=True)
     test_download_manager.register_downloader(http_downloader)
 
     # Download every hour.
-    test_download_manager.recurring_download('https://example.com', Seconds.hour, skip_download=True)
+    test_download_manager.recurring_download('https://example.com', Seconds.hour)
 
     # One download is scheduled.
-    downloads = test_download_manager.get_new_downloads(session)
+    downloads = test_download_manager.get_new_downloads(test_session)
     assert [(i.url, i.frequency) for i in downloads] == [('https://example.com', Seconds.hour)]
 
-    now = fake_now(datetime(2020, 1, 1, 0, 0, 0))
+    now_ = fake_now(datetime(2020, 1, 1, 0, 0, 0))
 
     # Download is processed and successful, no longer "new".
-    test_download_manager.do_downloads_sync()
+    await test_download_manager.wait_for_all_downloads()
     http_downloader.do_download.assert_called_once()
-    assert list(test_download_manager.get_new_downloads(session)) == []
-    downloads = list(test_download_manager.get_recurring_downloads(session))
+    assert list(test_download_manager.get_new_downloads(test_session)) == []
+    downloads = list(test_download_manager.get_recurring_downloads(test_session))
     assert len(downloads) == 1
     download = downloads[0]
     expected = local_timezone(datetime(2020, 1, 1, 1, 0, 0))
     assert download.next_download == expected
-    assert download.last_successful_download == now
+    assert download.last_successful_download == now_
 
     # Download is not due for an hour.
-    test_download_manager.renew_recurring_downloads(session)
-    assert list(test_download_manager.get_new_downloads(session)) == []
-    assert download.last_successful_download == now
+    test_download_manager.renew_recurring_downloads(test_session)
+    await test_download_manager.wait_for_all_downloads()
+    assert list(test_download_manager.get_new_downloads(test_session)) == []
+    assert download.last_successful_download == now_
 
     # Download is due an hour later.
     fake_now(datetime(2020, 1, 1, 2, 0, 1))
-    test_download_manager.renew_recurring_downloads(session)
-    (download,) = list(test_download_manager.get_new_downloads(session))
+    test_download_manager.renew_recurring_downloads(test_session)
+    (download,) = list(test_download_manager.get_new_downloads(test_session))
     # Download is "new" but has not been downloaded a second time.
     assert download.next_download == expected
-    assert download.last_successful_download == now
+    assert download.last_successful_download == now_
     assert download.status == 'new'
 
     # Try the download, but it fails.
     http_downloader.do_download.reset_mock()
     http_downloader.do_download.return_value = DownloadResult(success=False)
-    test_download_manager.do_downloads_sync()
+    await test_download_manager.wait_for_all_downloads()
     http_downloader.do_download.assert_called_once()
-    download = session.query(Download).one()
+    download = test_session.query(Download).one()
     # Download is deferred, last successful download remains the same.
     assert download.status == 'deferred'
-    assert download.last_successful_download == now
+    assert download.last_successful_download == now_
     # Download should be retried after the DEFAULT_RETRY_FREQUENCY.
     expected = local_timezone(datetime(2020, 1, 1, 3, 0, 0, 997200))
     assert download.next_download == expected
 
     # Try the download again, it finally succeeds.
     http_downloader.do_download.reset_mock()
-    now = fake_now(datetime(2020, 1, 1, 4, 0, 1))
+    now_ = fake_now(datetime(2020, 1, 1, 4, 0, 1))
     http_downloader.do_download.return_value = DownloadResult(success=True)
-    test_download_manager.renew_recurring_downloads(session)
-    test_download_manager.do_downloads_sync()
+    test_download_manager.renew_recurring_downloads(test_session)
+    await test_download_manager.wait_for_all_downloads()
     http_downloader.do_download.assert_called_once()
-    download = session.query(Download).one()
+    download = test_session.query(Download).one()
     assert download.status == 'complete'
-    assert download.last_successful_download == now
+    assert download.last_successful_download == now_
     # Floats cause slightly wrong date.
     assert download.next_download == local_timezone(datetime(2020, 1, 1, 5, 0, 0, 997200))
 
 
-def test_max_attempts(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_max_attempts(test_session, test_download_manager):
     """A Download will only be attempted so many times, it will eventually be deleted."""
     _, session = get_db_context()
 
@@ -330,23 +291,27 @@ def test_max_attempts(test_session, test_download_manager):
     http_downloader.do_download.return_value = DownloadResult(success=True)
     test_download_manager.register_downloader(http_downloader)
 
-    test_download_manager.create_download('https://example.com', session)
+    test_download_manager.create_download('https://example.com')
+    await test_download_manager.wait_for_all_downloads()
     download = session.query(Download).one()
     assert download.attempts == 1
 
-    test_download_manager.create_download('https://example.com', session)
+    test_download_manager.create_download('https://example.com')
+    await test_download_manager.wait_for_all_downloads()
     download = session.query(Download).one()
     assert download.attempts == 2
 
     # There are no further attempts.
     http_downloader.do_download.side_effect = UnrecoverableDownloadError()
-    test_download_manager.create_download('https://example.com', session)
+    test_download_manager.create_download('https://example.com')
+    await test_download_manager.wait_for_all_downloads()
     download = session.query(Download).one()
     assert download.attempts == 3
     assert download.status == 'failed'
 
 
-def test_skip_urls(test_session, test_download_manager, test_client, assert_download_urls):
+@pytest.mark.asyncio
+async def test_skip_urls(test_session, test_download_manager, test_client, assert_download_urls):
     """The DownloadManager will not create downloads for URLs in it's skip list."""
     _, session = get_db_context()
     from wrolpi.downloader import DOWNLOAD_MANAGER_CONFIG
@@ -361,41 +326,79 @@ def test_skip_urls(test_session, test_download_manager, test_client, assert_down
         'https://example.com/1',
         'https://example.com/skipme',
         'https://example.com/2',
-    ], downloader_name=HTTPDownloader.name)
+    ], downloader=HTTPDownloader.name)
+    await test_download_manager.wait_for_all_downloads()
     assert_download_urls({'https://example.com/1', 'https://example.com/2'})
     assert DOWNLOAD_MANAGER_CONFIG.skip_urls == ['https://example.com/skipme']
 
     test_download_manager.delete_completed()
 
     # The user can start a download even if the URL is in the skip list.
-    test_download_manager.create_download('https://example.com/skipme', session=test_session, reset_attempts=True)
+    test_download_manager.create_download('https://example.com/skipme', reset_attempts=True)
     assert_download_urls({'https://example.com/skipme'})
     assert DOWNLOAD_MANAGER_CONFIG.skip_urls == []
 
 
-def test_process_runner_timeout(test_directory):
+@pytest.mark.asyncio
+async def test_process_runner_timeout(test_directory):
     """A Downloader can cancel it's download using a timeout."""
     # Default timeout of 3 seconds.
     downloader = Downloader(0, 'downloader', timeout=3)
 
     # Default timeout is obeyed.
     start = datetime.now()
-    downloader.process_runner('https://example.com', ('sleep', '8'), test_directory)
+    await downloader.process_runner('https://example.com', ('sleep', '8'), test_directory)
     elapsed = datetime.now() - start
     assert 3 < elapsed.total_seconds() < 4
 
     # One-off timeout is obeyed.
     start = datetime.now()
-    downloader.process_runner('https://example.com', ('sleep', '8'), test_directory, timeout=1)
+    await downloader.process_runner('https://example.com', ('sleep', '8'), test_directory, timeout=1)
     elapsed = datetime.now() - start
     assert 1 < elapsed.total_seconds() < 2
 
-    # This Downloader's timeout is ignored in favor of the global timeout.
+    # Global timeout is obeyed.
     from wrolpi.common import WROLPI_CONFIG
     WROLPI_CONFIG.download_timeout = 3
-
-    # Global timeout is obeyed.
     start = datetime.now()
-    downloader.process_runner('https://example.com', ('sleep', '8'), test_directory)
+    await downloader.process_runner('https://example.com', ('sleep', '8'), test_directory)
     elapsed = datetime.now() - start
     assert 2 < elapsed.total_seconds() < 4
+
+
+@pytest.mark.asyncio
+async def test_multi_domain_download(test_session, test_directory, test_download_manager):
+    class TestDownloader(Downloader, ABC):
+        name = 'test_downloader'
+
+        @classmethod
+        def valid_url(cls, url: str) -> Tuple[bool, Optional[dict]]:
+            return True, {}
+
+        async def do_download(self, download: Download) -> DownloadResult:
+            await asyncio.sleep(1)
+            return DownloadResult(success=True)
+
+    async def wait_and_assert(urls_, max_seconds):
+        downloads = test_download_manager.create_downloads(urls_, downloader=test_downloader.name)
+        assert downloads and all(isinstance(i, Download) for i in downloads), 'Did not get Downloads'
+        start = now()
+        await test_download_manager.wait_for_all_downloads()
+        assert (elapsed := now() - start).total_seconds() < max_seconds, \
+            f'Downloads took {elapsed} seconds.  Were they in parallel?'
+        downloads = test_download_manager.get_downloads(test_session)
+        incomplete = [i.url for i in downloads if i.status != 'complete']
+        assert not incomplete, f'Some downloads did not complete: {incomplete}'
+
+    test_downloader = TestDownloader()
+    test_download_manager.register_downloader(test_downloader)
+
+    # Each domain's downloads will be processed one at a time.
+    # example.com and example.org will both download in parallel.
+    urls = ['https://example.com/1', 'https://example.com/2', 'https://example.com/3', 'https://example.org/1',
+            'https://example.org/2']
+    await wait_and_assert(urls, 4)
+
+    # Downloading more domains that workers is possible.
+    urls = [f'https://example.{i}' for i in range(test_download_manager.worker_count + 2)]
+    await wait_and_assert(urls, 3)
diff --git a/wrolpi/test/test_root_api.py b/wrolpi/test/test_root_api.py
index df488018..120398b3 100644
--- a/wrolpi/test/test_root_api.py
+++ b/wrolpi/test/test_root_api.py
@@ -15,6 +15,7 @@ from wrolpi.test.common import TestAPI, wrap_test_db, skip_circleci
 
 class TestRootAPI(TestAPI):
 
+    @wrap_test_db
     def test_index(self):
         """
         Index should have some details in an HTML response
@@ -61,6 +62,7 @@ class TestRootAPI(TestAPI):
         assert response.status_code == HTTPStatus.BAD_REQUEST
         assert json.loads(response.body) == {'valid': False, 'regex': '.*(missing parenthesis.*'}
 
+    @wrap_test_db
     def test_get_settings(self):
         with mock.patch('wrolpi.admin.CPUFREQ_INFO_BIN', '/usr/bin/cpufreq-info'), \
                 mock.patch('wrolpi.admin.NMCLI_BIN', '/usr/bin/nmcli'):
diff --git a/wrolpi/test/test_rss.py b/wrolpi/test/test_rss.py
index 962cf337..df984b7f 100644
--- a/wrolpi/test/test_rss.py
+++ b/wrolpi/test/test_rss.py
@@ -4,6 +4,7 @@ from itertools import zip_longest
 from typing import List
 
 import mock
+import pytest
 
 from wrolpi.db import optional_session
 from wrolpi.downloader import Download, DownloadResult, RSSDownloader
@@ -20,13 +21,8 @@ class RSSHTTPDownloader(HTTPDownloader):
         return download
 
 
-def test_rss_download_invalid(test_session, test_download_manager):
-    """Feeds are not downloaded when FeedParser reports an issue."""
-    rss_downloader = RSSDownloader()
-    test_download_manager.register_downloader(rss_downloader)
-
-
-def test_rss_download(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_rss_download(test_session, test_download_manager):
     """An RSS Downloader will create new Downloads for every link in the feed."""
     rss_downloader = RSSDownloader()
     test_download_manager.register_downloader(rss_downloader)
@@ -50,7 +46,8 @@ def test_rss_download(test_session, test_download_manager):
                 dict(link='https://example.com/c'),
             ]
         )
-        test_download_manager.create_download('https://example.com/feed', test_session, sub_downloader='http')
+        test_download_manager.create_download('https://example.com/feed', sub_downloader='http')
+        await test_download_manager.wait_for_all_downloads()
 
     # Feed download is complete.
     check_downloads([
@@ -68,7 +65,8 @@ def test_rss_download(test_session, test_download_manager):
                 dict(link='https://example.com/d'),
             ]
         )
-        test_download_manager.create_download('https://example.com/feed', test_session, sub_downloader='http')
+        test_download_manager.create_download('https://example.com/feed', sub_downloader='http')
+        await test_download_manager.wait_for_all_downloads()
 
     # Only the new URLs are Archived.
     check_downloads([
@@ -80,28 +78,8 @@ def test_rss_download(test_session, test_download_manager):
     ])
 
 
-def test_post_rss_download(test_session, test_client, test_download_manager):
-    """An RSS can be downloaded in the UI"""
-    rss_downloader = RSSDownloader()
-    test_download_manager.register_downloader(rss_downloader)
-    http_downloader = RSSHTTPDownloader()
-    test_download_manager.register_downloader(http_downloader)
-
-    with mock.patch('wrolpi.downloader.parse_feed') as mock_parse_feed:
-        mock_parse_feed.return_value = dict(bozo=0, entries=[])
-        content = dict(urls='https://example.com/feed', downloader='rss', frequency=100)
-        request, response = test_client.post('/api/download', content=json.dumps(content))
-        assert response.status == HTTPStatus.NO_CONTENT
-
-    # Download was attempted.
-    (download,) = test_download_manager.get_downloads(test_session)
-    assert download.url == 'https://example.com/feed'
-    assert download.frequency == 100
-    assert download.downloader == 'rss'
-    assert download.attempts == 1
-
-
-def test_rss_no_entries(test_session, test_download_manager):
+@pytest.mark.asyncio
+async def test_rss_no_entries(test_session, test_download_manager):
     """An RSS feed with no entries is handled."""
     rss_downloader = RSSDownloader()
     test_download_manager.register_downloader(rss_downloader)
@@ -109,6 +87,7 @@ def test_rss_no_entries(test_session, test_download_manager):
     with mock.patch('wrolpi.downloader.parse_feed') as mock_parse_feed:
         mock_parse_feed.return_value = dict(bozo=0, )  # missing `entries`
         test_download_manager.create_download('https://example.com/feed', test_session, sub_downloader='http')
+        await test_download_manager.wait_for_all_downloads()
 
     (download,) = test_download_manager.get_downloads(test_session)
     assert 'entries' in download.error
diff --git a/wrolpi/test/test_timeout.py b/wrolpi/test/test_timeout.py
deleted file mode 100644
index a84d098c..00000000
--- a/wrolpi/test/test_timeout.py
+++ /dev/null
@@ -1,47 +0,0 @@
-import time
-import unittest
-from unittest import mock
-
-from wrolpi.timeout import timeout, WorkerException
-
-
-class TestTimeout(unittest.TestCase):
-
-    def test_timeout(self):
-        """
-        The process will be killed if it takes too long.
-        """
-
-        @timeout(2)
-        def func():
-            time.sleep(5)
-            raise Exception('Was not killed!')
-
-        self.assertRaises(TimeoutError, func)
-
-    def test_timeout_exception(self):
-        """
-        If the wrapped function has an error, it will raise a WorkerException.
-        """
-
-        @timeout(10)
-        def func():
-            raise ValueError('Cause a worker error!')
-
-        self.assertRaises(WorkerException, func)
-
-    def test_test_timeout(self):
-        """Tests can overwrite the timeout"""
-
-        @timeout(0.1)
-        def func():
-            time.sleep(1)
-            return True
-
-        # Killed after 0.1 seconds
-        self.assertRaises(TimeoutError, func)
-
-        with mock.patch('wrolpi.timeout.TEST_TIMEOUT', 2):
-            # New timeout allows the function to finish.
-            result = func()
-            self.assertTrue(result)
diff --git a/wrolpi/timeout.py b/wrolpi/timeout.py
deleted file mode 100644
index 3322014e..00000000
--- a/wrolpi/timeout.py
+++ /dev/null
@@ -1,114 +0,0 @@
-"""
-Wrap a function with `timeout` to kill it after some amount of seconds, the wrapped function is run in it's own
-process.  If the timeout is reached, kill the process and raise a TimeoutError.
-
-Log any errors in the global logger.  If the worker process raises an Exception, raise an Exception sharing it's
-description, log the traceback.
-
->>> @timeout(5)
->>> def long_running_function():
->>>    while True:
->>>        # Run infinitely
->>>        time.sleep(1)
-
->>> long_running_function()
-TimeoutError()
-"""
-import multiprocessing.connection
-import time
-import traceback
-from datetime import timedelta
-from functools import wraps
-from multiprocessing import Process, Pipe
-
-from wrolpi.common import logger
-from wrolpi.dates import utc_now
-
-logger = logger.getChild(__name__)
-
-
-class WorkerException(Exception):
-    pass
-
-
-TEST_TIMEOUT = None
-KILL_ATTEMPTS = 100
-
-
-def timeout(seconds: float) -> callable:
-    """
-    Create a worker process, let it run until the timeout, then kill it.  If the worker isn't killed, return
-    it's result or exception.  If it is killed, raise a TimeoutError.
-    """
-
-    def wrapper(func):
-
-        def worker_wrapper(pipe: multiprocessing.connection.Connection, *args, **kwargs):
-            """
-            Wraps a worker function so we can catch it's Exception, or return its results.
-            """
-            to_send = {}
-            try:
-                result = func(*args, **kwargs)
-                to_send['result'] = result
-            except Exception as e:
-                to_send.update({'exception': str(e), 'traceback': traceback.format_exc()})
-            finally:
-                pipe.send(to_send)
-
-        @wraps(func)
-        def wrapped(*args, **kwargs):
-            # unittest may override the timeout
-            _seconds = TEST_TIMEOUT or seconds
-
-            # Start the worker_wrapper, give it a way to communicate back.
-            parent_conn, child_conn = Pipe()
-            args = (child_conn,) + args
-            worker = Process(target=worker_wrapper, args=args, kwargs=kwargs)
-            worker.start()
-
-            # Continually attempt to get a result until the timeout is reached.
-            kill_time = utc_now() + timedelta(seconds=_seconds)
-            while True:
-                if not worker.is_alive():
-                    # Worker exited.
-                    break
-                if not utc_now() < kill_time:
-                    # Timeout was reached.
-                    break
-                if parent_conn.poll(0.1):  # This prevents a "busy loop"
-                    # Result is waiting.
-                    break
-
-            # Get the result, if any.
-            result = None
-            if parent_conn.poll(0):
-                result = parent_conn.recv()
-
-            attempts = 0
-            while worker.is_alive():
-                # Worker has run out of time.
-                worker.kill()
-                time.sleep(0.1)
-                attempts += 1
-                if attempts > KILL_ATTEMPTS:
-                    logger.warning(f'Failed to kill worker! {func}')
-                    break
-
-            worker.join()
-
-            if result:
-                if 'result' in result:
-                    return result['result']
-                elif 'exception' in result:
-                    exception = result['exception']
-                    _traceback = result['traceback']
-                    logger.warning(f'Traceback from worker: {_traceback}')
-                    raise WorkerException(f'Exception from worker: {exception}')
-
-            if attempts > 0:
-                raise TimeoutError(f'Killed worker after {_seconds} seconds: {func}')
-
-        return wrapped
-
-    return wrapper
diff --git a/wrolpi/version.py b/wrolpi/version.py
index dabeb96b..11320bab 100644
--- a/wrolpi/version.py
+++ b/wrolpi/version.py
@@ -1,4 +1,4 @@
-__version__ = '0.5.3-beta'
+__version__ = '0.6.0-beta'
 
 import subprocess