renamed project to Bugis and switch from WSGI@uwsgi to ASGI@granian

.gitea/workflows/build.yaml

@@ -0,0 +1,59 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+jobs:
+  "Build pip package":
+    runs-on: woryzen
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          cache: 'pip'
+      - name: Create virtualenv
+        run: |
+          python -m venv .venv
+          .venv/bin/pip install -r requirements.txt
+      - name: Execute build
+        run: |
+          .venv/bin/python -m build
+      - name: Publish artifacts
+        env:
+          TWINE_REPOSITORY_URL: ${{ vars.PYPI_REGISTRY_URL }}
+          TWINE_USERNAME: ${{ vars.PUBLISHER_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PUBLISHER_TOKEN }}
+        run: |
+          .venv/bin/python -m twine upload --repository gitea dist/*{.whl,tar.gz}
+  "Build Docker image":
+    runs-on: woryzen
+    steps:
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3.4.0
+        with:
+          driver: docker-container
+          platforms: |
+            linux/amd64
+            linux/arm64
+      -
+        name: Login to Gitea container registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.woggioni.net
+          username: woggioni
+          password: ${{ secrets.PUBLISHER_TOKEN }}
+      -
+        name: Build and push bugis images
+        uses: docker/build-push-action@v6
+        with:
+          platforms: |
+            linux/amd64
+            linux/arm64
+          push: true
+          pull: true
+          tags: |
+            "gitea.woggioni.net/woggioni/bugis:latest"
+            "gitea.woggioni.net/woggioni/bugis:1.0"
+          cache-from: type=registry,ref=gitea.woggioni.net/woggioni/bugis:buildx
+          cache-to: type=registry,mode=max,compression=zstd,image-manifest=true,oci-mediatypes=true,ref=gitea.woggioni.net/woggioni/bugis:buildx

.gitignore

@@ -1 +1,2 @@
 .venv
+__pycache__

Dockerfile

@@ -1,34 +1,40 @@
 FROM alpine:latest AS base
 LABEL org.opencontainers.image.authors=oggioni.walter@gmail.com
 RUN --mount=type=cache,target=/var/cache/apk apk update
-RUN --mount=type=cache,target=/var/cache/apk apk add python3 py3-pip uwsgi uwsgi-python3 graphviz uwsgi-gevent3
+RUN --mount=type=cache,target=/var/cache/apk apk add python3 py3-pip graphviz
 
 FROM base AS build
+RUN --mount=type=cache,target=/var/cache/apk apk add musl-dev gcc graphviz-dev
 RUN adduser -D luser
 USER luser
 WORKDIR /home/luser
-COPY --chown=luser:users ./requirements-dev.txt ./md2html/requirements-dev.txt
+COPY --chown=luser:users ./requirements-dev.txt ./bugis/requirements-dev.txt
-COPY --chown=luser:users ./src ./md2html/src
+COPY --chown=luser:users ./src ./bugis/src
-COPY --chown=luser:users ./pyproject.toml ./md2html/pyproject.toml
+COPY --chown=luser:users ./pyproject.toml ./bugis/pyproject.toml
-WORKDIR /home/luser/md2html
+WORKDIR /home/luser/bugis
-RUN python -m venv venv
+RUN python -m venv .venv
-RUN --mount=type=cache,target=/home/luser/.cache/pip,uid=1000,gid=1000 venv/bin/pip install -r requirements-dev.txt
+RUN --mount=type=cache,target=/home/luser/.cache/pip,uid=1000,gid=1000 .venv/bin/pip wheel -w /home/luser/wheel -r requirements-dev.txt pygraphviz
-RUN --mount=type=cache,target=/home/luser/.cache/pip,uid=1000,gid=1000 venv/bin/python -m build
+RUN --mount=type=cache,target=/home/luser/.cache/pip,uid=1000,gid=1000 .venv/bin/pip install -r requirements-dev.txt /home/luser/wheel/*.whl
+RUN --mount=type=cache,target=/home/luser/.cache/pip,uid=1000,gid=1000 .venv/bin/python -m build
 
 FROM base AS release
 RUN mkdir /srv/http
-RUN adduser -D -h /var/md2html -u 1000 md2html
+RUN adduser -D -h /var/bugis -u 1000 bugis
-USER md2html
+USER bugis
-WORKDIR /var/md2html
+WORKDIR /var/bugis
-RUN python -m venv venv
+COPY --chown=bugis:users conf/pip.conf ./.pip/pip.conf
-RUN --mount=type=cache,target=/var/md2html/.cache/pip,uid=1000,gid=1000 --mount=type=cache,ro,from=build,source=/home/luser/md2html/dist,target=/dist venv/bin/pip install /dist/*.whl
+RUN python -m venv .venv
-COPY --chown=md2html:users conf/uwsgi.ini /var/md2html/
+RUN --mount=type=cache,target=/var/bugis/.cache/pip,uid=1000,gid=1000 --mount=type=bind,ro,source=./requirements-run.txt,target=/requirements-run.txt --mount=type=bind,ro,from=build,source=/home/luser/wheel,target=/wheel .venv/bin/pip install -r /requirements-run.txt /wheel/*.whl
-
+RUN --mount=type=cache,target=/var/bugis/.cache/pip,uid=1000,gid=1000 --mount=type=bind,ro,from=build,source=/home/luser/bugis/dist,target=/dist .venv/bin/pip install /dist/*.whl
 VOLUME /srv/http
 WORKDIR /srv/http
-ENTRYPOINT ["uwsgi"]
-EXPOSE 1910/tcp
-EXPOSE 1910/udp
-CMD [ "--ini", "/var/md2html/uwsgi.ini" ]
 
+ENV GRANIAN_HOST=0.0.0.0
+ENV GRANIAN_INTERFACE=asginl
+ENV GRANIAN_LOOP=asyncio
+ENV GRANIAN_LOOP=asyncio
+ENV GRANIAN_LOG_ENABLED=false
+
+ENTRYPOINT ["/var/bugis/.venv/bin/python", "-m", "granian", "bugis.asgi:application"]
+EXPOSE 8000/tcp
 

README.md

@@ -9,3 +9,4 @@ uwsgi --need-plugin /usr/lib/uwsgi/python_plugin.so \
       --http-auto-chunked \ 
       --gevent 10
 ```
+

build_docker_image.sh

@@ -3,8 +3,7 @@ set -e
 
 venv/bin/python -m build
 mkdir -p docker/build
-cp dist/md2html-*.whl docker/build/
+cp dist/bugis-*.whl docker/build/
 cp docker/Dockerfile docker/build/Dockerfile
-cp docker/uwsgi.ini docker/build/uwsgi.ini
 
-docker build docker/build --tag alpine:md2html
+docker build docker/build --tag bugis:latest

conf/log.yml

@@ -0,0 +1,18 @@
+version: 1
+disable_existing_loggers: True
+handlers:
+  console:
+    class : logging.StreamHandler
+    formatter: default
+    level   : INFO
+    stream  : ext://sys.stdout
+formatters:
+  brief:
+    format: '%(message)s'
+  default:
+    format: '%(asctime)s %(levelname)-8s %(name)-15s %(threadName)s %(message)s'
+    datefmt: '%Y-%m-%d %H:%M:%S'
+loggers:
+  root:
+    handlers: [console]
+    level: INFO

conf/uwsgi.ini

@@ -1,8 +0,0 @@
-[uwsgi]
-#logformat = "%(proto) - %(method) %(uri) %(status) %(addr)
-need-plugin=/usr/lib/uwsgi/python_plugin.so
-need-plugin=/usr/lib/uwsgi/gevent3_plugin.so
-socket = 0.0.0.0:1910
-module = md2html.uwsgi_handler
-virtualenv = /var/md2html/venv
-gevent = 1000

pyproject.toml

@@ -3,8 +3,8 @@ requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
 
 [project]
-name = "md2html"
+name = "bugis"
-version = "0.3"
+version = "1.0"
 authors = [
   { name="Walter Oggioni", email="oggioni.walter@gmail.com" },
 ]
@@ -22,29 +22,32 @@ classifiers = [
         'Programming Language :: Python :: 3',
 ]
 dependencies = [
-    "gevent",
-    "greenlet",
     "Markdown",
     "Pygments",
     "watchdog",
-    "zope.event",
+    "pwo",
-    "zope.interface"
+    "PyYAML",
+    "pygraphviz"
 ]
 
 [project.optional-dependencies]
 dev = [
-    "build", "pip-tools", "mypy", "ipdb"
+    "build", "granian", "mypy", "ipdb", "twine"
+]
+
+run = [
+    "granian"
 ]
 
 [tool.setuptools.package-data]
-md2html = ['static/*']
+bugis = ['static/*', 'default-conf/*']
 
 [project.urls]
-"Homepage" = "https://github.com/woggioni/md2html"
+"Homepage" = "https://github.com/woggioni/bugis"
-"Bug Tracker" = "https://github.com/woggioni/md2html/issues"
+"Bug Tracker" = "https://github.com/woggioni/bugis/issues"
 
 [tool.mypy]
-python_version = "3.10"
+python_version = "3.12"
 disallow_untyped_defs = true
 show_error_codes = true
 no_implicit_optional = true

requirements-dev.txt

@@ -1,103 +1,143 @@
 #
-# This file is autogenerated by pip-compile with Python 3.10
+# This file is autogenerated by pip-compile with Python 3.12
 # by the following command:
 #
 #    pip-compile --extra=dev --output-file=requirements-dev.txt pyproject.toml
 #
---index-url https://gitea.woggioni.net/api/packages/woggioni/pypi/simple/
+--index-url https://gitea.woggioni.net/api/packages/woggioni/pypi/simple
 --extra-index-url https://pypi.org/simple
 
 asttokens==2.4.1
     # via stack-data
-build==1.2.1
+build==1.2.2.post1
-    # via
+    # via bugis (pyproject.toml)
-    #   md2html (pyproject.toml)
+certifi==2024.8.30
-    #   pip-tools
+    # via requests
+cffi==1.17.1
+    # via cryptography
+charset-normalizer==3.4.0
+    # via requests
 click==8.1.7
-    # via pip-tools
+    # via granian
+cryptography==43.0.3
+    # via secretstorage
 decorator==5.1.1
     # via
     #   ipdb
     #   ipython
-exceptiongroup==1.2.2
+docutils==0.21.2
-    # via ipython
+    # via readme-renderer
-executing==2.0.1
+executing==2.1.0
     # via stack-data
-gevent==24.2.1
+granian==1.6.1
-    # via md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-greenlet==3.0.3
+idna==3.10
-    # via
+    # via requests
-    #   gevent
+importlib-metadata==8.5.0
-    #   md2html (pyproject.toml)
+    # via twine
 ipdb==0.13.13
-    # via md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-ipython==8.26.0
+ipython==8.28.0
     # via ipdb
+jaraco-classes==3.4.0
+    # via keyring
+jaraco-context==6.0.1
+    # via keyring
+jaraco-functools==4.1.0
+    # via keyring
 jedi==0.19.1
     # via ipython
-markdown==3.6
+jeepney==0.8.0
-    # via md2html (pyproject.toml)
+    # via
+    #   keyring
+    #   secretstorage
+keyring==25.4.1
+    # via twine
+markdown==3.7
+    # via bugis (pyproject.toml)
+markdown-it-py==3.0.0
+    # via rich
 matplotlib-inline==0.1.7
     # via ipython
-mypy==1.11.1
+mdurl==0.1.2
-    # via md2html (pyproject.toml)
+    # via markdown-it-py
+more-itertools==10.5.0
+    # via
+    #   jaraco-classes
+    #   jaraco-functools
+mypy==1.12.1
+    # via bugis (pyproject.toml)
 mypy-extensions==1.0.0
     # via mypy
+nh3==0.2.18
+    # via readme-renderer
 packaging==24.1
     # via build
 parso==0.8.4
     # via jedi
 pexpect==4.9.0
     # via ipython
-pip-tools==7.4.1
+pkginfo==1.10.0
-    # via md2html (pyproject.toml)
+    # via twine
-prompt-toolkit==3.0.47
+prompt-toolkit==3.0.48
     # via ipython
 ptyprocess==0.7.0
     # via pexpect
 pure-eval==0.2.3
     # via stack-data
+pwo==0.0.3
+    # via bugis (pyproject.toml)
+pycparser==2.22
+    # via cffi
 pygments==2.18.0
     # via
+    #   bugis (pyproject.toml)
     #   ipython
-    #   md2html (pyproject.toml)
+    #   readme-renderer
-pyproject-hooks==1.1.0
+    #   rich
+pygraphviz==1.14
+    # via bugis (pyproject.toml)
+pyproject-hooks==1.2.0
+    # via build
+pyyaml==6.0.2
+    # via bugis (pyproject.toml)
+readme-renderer==44.0
+    # via twine
+requests==2.32.3
     # via
-    #   build
+    #   requests-toolbelt
-    #   pip-tools
+    #   twine
+requests-toolbelt==1.0.0
+    # via twine
+rfc3986==2.0.0
+    # via twine
+rich==13.9.2
+    # via twine
+secretstorage==3.3.3
+    # via keyring
 six==1.16.0
     # via asttokens
 stack-data==0.6.3
     # via ipython
-tomli==2.0.1
-    # via
-    #   build
-    #   ipdb
-    #   mypy
-    #   pip-tools
 traitlets==5.14.3
     # via
     #   ipython
     #   matplotlib-inline
-typing-extensions==4.12.2
+twine==5.1.1
+    # via bugis (pyproject.toml)
+typing-extensions==4.7.1
     # via
-    #   ipython
     #   mypy
-watchdog==4.0.2
+    #   pwo
-    # via md2html (pyproject.toml)
+urllib3==2.2.3
+    # via
+    #   requests
+    #   twine
+uvloop==0.21.0
+    # via granian
+watchdog==5.0.3
+    # via bugis (pyproject.toml)
 wcwidth==0.2.13
     # via prompt-toolkit
-wheel==0.44.0
+zipp==3.20.2
-    # via pip-tools
+    # via importlib-metadata
-zope-event==5.0
-    # via
-    #   gevent
-    #   md2html (pyproject.toml)
-zope-interface==7.0.1
-    # via
-    #   gevent
-    #   md2html (pyproject.toml)
-
-# The following packages are considered to be unsafe in a requirements file:
-# pip
-# setuptools

requirements.txt

@@ -1,32 +1,23 @@
 #
-# This file is autogenerated by pip-compile with Python 3.10
+# This file is autogenerated by pip-compile with Python 3.12
 # by the following command:
 #
-#    pip-compile --output-file=requirements.txt --strip-extras pyproject.toml
+#    pip-compile --output-file=requirements.txt pyproject.toml
 #
---index-url https://gitea.woggioni.net/api/packages/woggioni/pypi/simple/
+--index-url https://gitea.woggioni.net/api/packages/woggioni/pypi/simple
 --extra-index-url https://pypi.org/simple
 
-gevent==23.9.1
+markdown==3.7
-    # via md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-greenlet==3.0.0
+pwo==0.0.3
-    # via
+    # via bugis (pyproject.toml)
-    #   gevent
+pygments==2.18.0
-    #   md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-markdown==3.5
+pygraphviz==1.14
-    # via md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-pygments==2.16.1
+pyyaml==6.0.2
-    # via md2html (pyproject.toml)
+    # via bugis (pyproject.toml)
-watchdog==3.0.0
+typing-extensions==4.7.1
-    # via md2html (pyproject.toml)
+    # via pwo
-zope-event==5.0
+watchdog==5.0.3
-    # via
+    # via bugis (pyproject.toml)
-    #   gevent
-    #   md2html (pyproject.toml)
-zope-interface==6.1
-    # via
-    #   gevent
-    #   md2html (pyproject.toml)
-
-# The following packages are considered to be unsafe in a requirements file:
-# setuptools

src/bugis/asgi.py

@@ -0,0 +1,35 @@
+import logging
+from logging.config import dictConfig as configure_logging
+from os import environ
+from pathlib import Path
+
+from pwo import Maybe
+from yaml import safe_load
+from .server import Server
+
+logging_configuration_file = environ.get("LOGGING_CONFIGURATION_FILE", Path(__file__).parent / 'default-conf' / 'logging.yaml')
+with open(logging_configuration_file, 'r') as input_file:
+    conf = safe_load(input_file)
+    configure_logging(conf)
+
+
+log = logging.getLogger(__name__)
+
+_server = None
+async def application(ctx, receive, send):
+    global _server
+    if _server is None:
+        _server = Server(prefix=None)
+    log.info(None, extra=ctx)
+    await _server.handle_request(
+        ctx['method'],
+        ctx['path'],
+        Maybe.of([header[1] for header in ctx['headers'] if header[0].decode().lower() == 'if-none-match'])
+            .filter(lambda it: len(it) > 0)
+            .map(lambda it: it[0])
+            .map(lambda it: it.decode())
+            .or_else(None),
+        Maybe.of_nullable(ctx.get('query_string', None)).map(lambda it: it.decode()).or_else(None),
+        send
+    )
+

src/bugis/async_watchdog.py

@@ -0,0 +1,172 @@
+import asyncio
+
+from watchdog.events import FileSystemEventHandler, FileSystemEvent, PatternMatchingEventHandler
+from watchdog.observers import Observer
+from watchdog.events import FileMovedEvent, FileClosedEvent, FileCreatedEvent, FileModifiedEvent
+from pathlib import Path
+from asyncio import Queue, AbstractEventLoop, Future, CancelledError, Task
+from typing import Optional, Callable
+from logging import getLogger
+
+
+class Subscription:
+    _unsubscribe_callback: Callable[['Subscription'], None]
+    _event: Future
+    _loop: AbstractEventLoop
+
+    def __init__(self, unsubscribe: Callable[['Subscription'], None], loop: AbstractEventLoop):
+        self._unsubscribe_callback = unsubscribe
+        self._event: Future = loop.create_future()
+        self._loop = loop
+
+    def unsubscribe(self) -> None:
+        self._unsubscribe_callback(self)
+
+    async def wait(self, tout: float) -> bool:
+        handle = self._loop.call_later(tout, lambda: self._event.cancel())
+        try:
+            await self._event
+            return True
+        except CancelledError:
+            return False
+        finally:
+            handle.cancel()
+
+    def notify(self) -> None:
+        self._event.set_result(None)
+
+    def reset(self) -> None:
+        self._event = self._loop.create_future()
+
+
+class _EventHandler(FileSystemEventHandler):
+    _queue: Queue
+    _loop: AbstractEventLoop
+
+    def __init__(self, queue: Queue, loop: AbstractEventLoop,
+                 *args, **kwargs):
+        self._loop = loop
+        self._queue = queue
+        super(*args, **kwargs)
+
+    def on_created(self, event: FileSystemEvent) -> None:
+        self._loop.call_soon_threadsafe(self._queue.put_nowait, event)
+
+    def on_modified(self, event: FileSystemEvent) -> None:
+        self._loop.call_soon_threadsafe(self._queue.put_nowait, event)
+
+
+class AsyncQueueIterator:
+    _queue: Queue
+
+    def __init__(self, queue: Queue):
+        self._queue = queue
+
+    def __aiter__(self):
+        return self
+
+    async def __anext__(self):
+        item = await self._queue.get()
+        if item is None:
+            raise StopAsyncIteration
+        return item
+
+
+observer = Observer()
+
+
+def watch(path: Path, queue: Queue, loop: AbstractEventLoop,
+          recursive: bool = False) -> None:
+    """Watch a directory for changes."""
+    handler = _EventHandler(queue, loop)
+
+    observer.schedule(handler, str(path), recursive=recursive)
+    observer.start()
+    observer.join()
+    loop.call_soon_threadsafe(queue.put_nowait, None)
+
+
+class SubscriptionManager:
+    _loop: AbstractEventLoop
+    _queue: Queue
+    _subscriptions: dict[str, set[Subscription]]
+
+    def __init__(self, loop: AbstractEventLoop):
+        self._subscriptions: dict[str, set[Subscription]] = dict()
+        self._loop = loop
+        self._queue = Queue()
+
+    def subscribe(self, path: str) -> Subscription:
+        subscriptions = self._subscriptions
+        subscriptions_per_path = subscriptions.setdefault(path, set())
+
+        def unsubscribe_callback(subscription):
+            subscriptions_per_path.remove(subscription)
+
+        result = Subscription(unsubscribe_callback, self._loop)
+        subscriptions_per_path.add(result)
+        return result
+
+    def _notify_subscriptions(self, path):
+        subscriptions = self._subscriptions
+        subscriptions_per_path = subscriptions.get(path, None)
+        if subscriptions_per_path:
+            for s in subscriptions_per_path:
+                s.notify()
+
+    async def process_events(self):
+        async for evt in AsyncQueueIterator(self._queue):
+            self._notify_subscriptions(evt)
+
+    def post_event(self, path):
+        self._loop.call_soon_threadsafe(self._queue.put_nowait, path)
+
+
+class FileWatcher(PatternMatchingEventHandler):
+    _subscription_manager: SubscriptionManager
+    _loop: AbstractEventLoop
+    _subscription_manager_loop: Task
+
+    def __init__(self, path):
+        super().__init__(patterns=['*.md'],
+                         ignore_patterns=None,
+                         ignore_directories=False,
+                         case_sensitive=True)
+        self._observer: Observer = Observer()
+        self._observer.schedule(self, path=path, recursive=True)
+        self.logger = getLogger(FileWatcher.__name__)
+        self._loop = asyncio.get_running_loop()
+        self._subscription_manager = SubscriptionManager(self._loop)
+        self._loop.run_in_executor(None, self._observer.start)
+        self._subscription_manager_loop = self._loop.create_task(self._subscription_manager.process_events())
+
+    async def stop(self) -> None:
+        def _observer_stop():
+            self._observer.stop()
+            self._observer.join()
+            self._subscription_manager.post_event(None)
+
+        self._loop.run_in_executor(None, _observer_stop)
+        await self._subscription_manager_loop
+
+    def subscribe(self, path: str) -> Subscription:
+        return self._subscription_manager.subscribe(path)
+
+    def on_any_event(self, event: FileSystemEvent) -> None:
+        what = "directory" if event.is_directory else "file"
+
+        def post_event(path):
+            self._subscription_manager.post_event(path)
+
+        if isinstance(event, FileClosedEvent):
+            self.logger.debug("Closed %s: %s", what, event.src_path)
+            # update_subscriptions()
+        elif isinstance(event, FileMovedEvent):
+            self.logger.debug("Moved %s: %s to %s", what, event.src_path, event.dest_path)
+            post_event(event.dest_path)
+        elif isinstance(event, FileCreatedEvent):
+            self.logger.debug("Created %s: %s", what, event.src_path)
+            post_event(event.src_path)
+        elif isinstance(event, FileModifiedEvent):
+            self.logger.debug("Modified %s: %s", what, event.src_path)
+            post_event(event.src_path)

src/bugis/default-conf/logging.yaml

@@ -0,0 +1,19 @@
+version: 1
+disable_existing_loggers: True
+handlers:
+  console:
+    class : logging.StreamHandler
+    formatter: default
+    level   : INFO
+    stream  : ext://sys.stdout
+formatters:
+  brief:
+    format: '%(message)s'
+  default:
+    format: '{asctime} [{levelname}] ({processName:s}/{threadName:s}) - {name} - {message}'
+    style: '{'
+    datefmt: '%Y-%m-%d %H:%M:%S'
+loggers:
+  root:
+    handlers: [console]
+    level: INFO

src/bugis/file_watch.py

@@ -5,26 +5,32 @@ from watchdog.events import PatternMatchingEventHandler, FileSystemEvent, \
     FileCreatedEvent, FileModifiedEvent, FileClosedEvent, FileMovedEvent
 from watchdog.observers import Observer
 import logging
-from gevent.event import Event
+# from gevent.event import Event
-
+from asyncio import Future, BaseEventLoop
 
 class Subscription:
+    _unsubscribe_callback: Callable[['Subscription'], None]
+    _event: Future
+    _loop: BaseEventLoop
 
-    def __init__(self, unsubscribe: Callable[['Subscription'], None]):
+    def __init__(self, unsubscribe: Callable[['Subscription'], None], loop: BaseEventLoop):
         self._unsubscribe_callback = unsubscribe
-        self._event: Event = Event()
+        self._event: Future = loop.create_future()
+        self._loop = loop
 
     def unsubscribe(self) -> None:
         self._unsubscribe_callback(self)
 
-    def wait(self, tout: float) -> bool:
+    async def wait(self, tout: float) -> bool:
+        handle = self._loop.call_later(tout, lambda: self._event.cancel())
+        await self._event
         return self._event.wait(tout)
 
     def notify(self) -> None:
-        self._event.set()
+        self._event.set_result(None)
 
     def reset(self) -> None:
-        self._event.clear()
+        self._event = self._loop.create_future()
 
 
 class FileWatcher(PatternMatchingEventHandler):

src/bugis/server.py

@@ -5,10 +5,11 @@ from mimetypes import init as mimeinit, guess_type
 import hashlib
 from .md2html import compile_html, load_from_cache, STATIC_RESOURCES, MARDOWN_EXTENSIONS
 from shutil import which
-from subprocess import check_output
+import pygraphviz as pgv
 from io import BytesIO
 from typing import Callable, TYPE_CHECKING, BinaryIO, Optional
-from .file_watch import FileWatcher
+from .async_watchdog import FileWatcher
+from pwo import Maybe
 
 if TYPE_CHECKING:
     from _typeshed import StrOrBytesPath
@@ -40,10 +41,17 @@ class Server:
         self.logger = logging.getLogger(Server.__name__)
         self.prefix = prefix and normpath(f'{prefix.decode()}')
 
-    def handle_request(self, method: str, url_path: str, etag: Optional[str], query_string: Optional[str], start_response):
+    async def handle_request(self, method: str, url_path: str, etag: Optional[str], query_string: Optional[str], send):
         if method != 'GET':
-            start_response('405', [])
+            await send({
-            return []
+                'type': 'http.response.start',
+                'status': 405
+            })
+            await send({
+                'type': 'http.response.body',
+                'body': b'',
+            })
+            return
         relative_path = relpath(url_path, start=self.prefix or '/')
         url_path: 'StrOrBytesPath' = normpath(join('/', relative_path))
         path: 'StrOrBytesPath' = join(self.root_dir, relative_path)
@@ -57,15 +65,25 @@ class Server:
                 lambda: mtime
             )
             if etag and etag == digest:
-                return self.not_modified(start_response, digest, ('Cache-Control', 'must-revalidate, max-age=86400'))
+                await self.not_modified(send, digest, ('Cache-Control', 'must-revalidate, max-age=86400'))
+                return
             elif content:
                 mime_type = guess_type(basename(url_path))[0] or 'application/octet-stream'
-                start_response('200 OK', [
+                await send({
-                    ('Content-Type', f'{mime_type}; charset=UTF-8'),
+                    'type': 'http.response.start',
-                    ('Etag', 'W/"%s"' % digest),
+                    'status': 200,
-                    ('Cache-Control', 'must-revalidate, max-age=86400'),
+                    'headers': [
-                ])
+                        (b'content-type', f'{mime_type}; charset=UTF-8'.encode()),
-                return content
+                        (b'etag', f'W/"{digest}"'.encode()),
+                        (b'content-type', f'{mime_type}; charset=UTF-8'.encode()),
+                        (b'Cache-Control', b'must-revalidate, max-age=86400'),
+                    ]
+                })
+                await send({
+                    'type': 'http.response.body',
+                    'body': content
+                })
+                return
         elif exists(path):
             if isfile(path):
                 etag, digest = self.compute_etag_and_digest(
@@ -74,11 +92,12 @@ class Server:
                     lambda: open(path, 'rb'),
                     lambda: getmtime(path)
                 )
+                self.logger.debug('%s %s', etag, digest)
                 if etag and etag == digest:
                     if is_markdown(path) and query_string == 'reload':
                         subscription = self.file_watcher.subscribe(path)
                         try:
-                            has_changed = subscription.wait(30)
+                            has_changed = await subscription.wait(30)
                             if has_changed:
                                 _, digest = self.compute_etag_and_digest(
                                     etag,
@@ -88,22 +107,33 @@ class Server:
                                 )
                                 if etag != digest:
                                     if exists(path) and isfile(path):
-                                        return self.render_markdown(url_path, path, True, digest, start_response)
+                                        await self.render_markdown(url_path, path, True, digest, send)
+                                        return
                                     else:
-                                        return self.not_found(start_response)
+                                        await self.not_found(send)
+                                        return
                         finally:
                             subscription.unsubscribe()
-                    return self.not_modified(start_response, digest)
+                    await self.not_modified(send, digest)
                 elif is_markdown(path):
                     raw = query_string == 'reload'
-                    return self.render_markdown(url_path, path, raw, digest, start_response)
+                    await self.render_markdown(url_path, path, raw, digest, send)
                 elif is_dotfile(path) and which("dot"):
-                    body = check_output(['dot', '-Tsvg', basename(path)], cwd=dirname(path))
+                    graph = pgv.AGraph(path)
-                    start_response('200 OK', [('Content-Type', 'image/svg+xml; charset=UTF-8'),
+                    body = graph.draw(None, format="svg", prog="dot")
-                                              ('Etag', 'W/"%s"' % digest),
+                    await send({
-                                              ('Cache-Control', 'no-cache'),
+                        'type': 'http.response.start',
-                                              ])
+                        'status': 200,
-                    return [body]
+                        'headers': (
+                            (b'Content-Type', b'image/svg+xml; charset=UTF-8'),
+                            (b'Etag', f'W/"{digest}"'.encode()),
+                            (b'Cache-Control', b'no-cache'),
+                        )
+                    })
+                    await send({
+                        'type': 'http.response.body',
+                        'body': body
+                    })
                 else:
                     def read_file(file_path):
                         buffer_size = 1024
@@ -114,19 +144,34 @@ class Server:
                                     break
                                 yield result
 
-                    start_response('200 OK',
+                    await send({
-                                   [('Content-Type', guess_type(basename(path))[0] or 'application/octet-stream'),
+                        'type': 'http.response.start',
-                                    ('Etag', 'W/"%s"' % digest),
+                        'status': 200,
-                                    ('Cache-Control', 'no-cache'),
+                        'headers': (
-                                    ])
+                            (b'Content-Type', guess_type(basename(path))[0].encode() or b'application/octet-stream'),
-                    return read_file(path)
+                            (b'Etag', f'W/"{digest}"'),
+                            (b'Cache-Control', b'no-cache')
+                        )
+                    })
+                    await send({
+                        'type': 'http.response.body',
+                        'body': read_file(path)
+                    })
             elif isdir(path):
                 body = self.directory_listing(url_path, path).encode()
-                start_response('200 OK', [
+                await send({
-                    ('Content-Type', 'text/html; charset=UTF-8'),
+                    'type': 'http.response.start',
-                ])
+                    'status': 200,
-                return [body]
+                    'headers': (
-        return self.not_found(start_response)
+                        (b'Content-Type', b'text/html; charset=UTF-8'),
+                    )
+                })
+                await send({
+                    'type': 'http.response.body',
+                    'body': body
+                })
+        else:
+            await self.not_found(send)
 
     @staticmethod
     def stream_hash(source: BinaryIO, bufsize=0x1000) -> bytes:
@@ -155,13 +200,17 @@ class Server:
 
     @staticmethod
     def parse_etag(etag: str) -> Optional[str]:
-        if etag is None:
+        def skip_weak_marker(s):
-            return
+            if s.startswith('W/'):
-        start = etag.find('"')
+                return s[2:]
-        if start < 0:
+            else:
-            return
+                return s
-        end = etag.find('"', start + 1)
+
-        return etag[start + 1: end]
+        return (
+            Maybe.of_nullable(etag)
+                .map(skip_weak_marker)
+                .or_else(None)
+        )
 
     def compute_etag_and_digest(
             self,
@@ -189,34 +238,55 @@ class Server:
         etag = Server.parse_etag(etag_header)
         return etag, digest
 
-    def render_markdown(self,
+    async def render_markdown(self,
                         url_path: 'StrOrBytesPath',
                         path: str,
                         raw: bool,
                         digest: str,
-                        start_response) -> list[bytes]:
+                        send) -> list[bytes]:
         body = compile_html(url_path,
                             path,
                             self.prefix,
                             MARDOWN_EXTENSIONS,
                             raw=raw).encode()
-        start_response('200 OK', [('Content-Type', 'text/html; charset=UTF-8'),
+        await send({
-                                  ('Etag', 'W/"%s"' % digest),
+            'type': 'http.response.start',
-                                  ('Cache-Control', 'no-cache'),
+            'status': 200,
-                                  ])
+            'headers': (
-        return [body]
+                (b'Content-Type', b'text/html; charset=UTF-8'),
+                (b'Etag', f'W/{digest}'.encode()),
+                (b'Cache-Control', b'no-cache'),
+            )
+        })
+        await send({
+            'type': 'http.response.body',
+            'body': body
+        })
+        return
     @staticmethod
-    def not_modified(start_response, digest: str, cache_control=('Cache-Control', 'no-cache')) -> []:
+    async def not_modified(send, digest: str, cache_control=('Cache-Control', 'no-cache')) -> []:
-        start_response('304 Not Modified', [
+        await send({
-            ('Etag', f'W/"{digest}"'),
+            'type': 'http.response.start',
-            cache_control,
+            'status': 304,
-        ])
+            'headers': (
-        return []
+                (b'Etag', f'W/{digest}'.encode()),
+                cache_control
+            )
+        })
+        await send({
+            'type': 'http.response.body',
+        })
+        return
 
     @staticmethod
-    def not_found(start_response) -> list[bytes]:
+    async def not_found(send) -> None:
-        start_response('404 NOT_FOUND', [])
+        await send({
-        return []
+            'type': 'http.response.start',
+            'status': 404
+        })
+        await send({
+            'type': 'http.response.body',
+        })
 
     def directory_listing(self, path_info, path) -> str:
         icon_path = join(self.prefix or '', 'markdown.svg')

src/md2html/uwsgi_handler.py

@@ -1,25 +0,0 @@
-import logging
-from .server import Server
-from uwsgi import log, opt
-class UwsgiHandler(logging.Handler):
-
-    def emit(self, record: logging.LogRecord) -> None:
-        log(self.formatter.format(record))
-
-
-logging.basicConfig(
-    level=logging.INFO,
-    format='%(asctime)s [%(threadName)s] (%(name)s) %(levelname)s %(message)s',
-    handlers=[UwsgiHandler()]
-)
-
-server = Server(prefix=opt.get('prefix', None))
-
-def application(env, start_response):
-    return server.handle_request(
-        env['REQUEST_METHOD'],
-        env['PATH_INFO'],
-        env.get('HTTP_IF_NONE_MATCH', None),
-        env.get('QUERY_STRING', None),
-        start_response
-    )

test/example.dot

@@ -0,0 +1,27 @@
+digraph D {
+
+  subgraph cluster_p {
+    label = "Parent";
+
+    subgraph cluster_c1 {
+      label = "Child one";
+      a;
+
+      subgraph cluster_gc_1 {
+        label = "Grand-Child one";
+         b;
+      }
+      subgraph cluster_gc_2 {
+        label = "Grand-Child two";
+          c;
+          d;
+      }
+
+    }
+
+    subgraph cluster_c2 {
+      label = "Child two";
+      e;
+    }
+  }
+}