Refactor to wmn package/module

Dockerfile

@@ -3,21 +3,21 @@ MAINTAINER Benedikt Ziemons <ben@rs485.network>
 
 RUN apk add --no-cache uwsgi-python3 python3 py3-yaml py3-flask py3-matrix-nio py3-dateutil
 
-# partly from https://hub.docker.com/_/python?tab=description#create-a-dockerfile-in-your-python-app-project
-WORKDIR /usr/src/wmn
+# copy required source files
+COPY wmn/ /usr/local/lib/wmn/wmn
 
-# copy required source file
-COPY wmn.py ./
+ARG WMN_UID=1000
+ARG WMN_GID=1000
 
-WORKDIR /run/wmn
+RUN mkdir -p /etc/wmn && \
+    chmod 0700 /etc/wmn && \
+    chown "${WMN_UID}" /etc/wmn && \
+    addgroup -g "${WMN_GID}" wmn && \
+    adduser -s /bin/sh -u "${WMN_UID}" -G wmn -D wmn
 
-ARG WMN_UID=999
-
-# requires config.yml to be present at build
-COPY config.yml ./
-RUN chown -R $WMN_UID /run/wmn && chmod 0600 /run/wmn/config.yml
-
-USER $WMN_UID
+USER wmn
+VOLUME /etc/wmn/config.yml
+ENV WMN_CONFIG_PATH=/etc/wmn/config.yml
 
 ARG PORT=3031
 EXPOSE $PORT
@@ -26,7 +26,8 @@ ENV UWSGI_SOCKET=:$PORT
 # opens a uwsgi socket at the given port, which is to be used by a reverse proxy
 CMD [ "uwsgi", "--die-on-term", \
                "--need-plugin", "python3", \
-               "--wsgi-file", "/usr/src/wmn/wmn.py", \
+               "--module", "wmn.wmn", \
+               "--pythonpath", "/usr/local/lib/wmn", \
                "--master", \
                "--processes", "1", \
                "--threads", "2" ]

wmn/__init__.py

@@ -0,0 +1 @@
+__all__ = ["common", "notify", "wmn"]

wmn/common.py

@@ -16,7 +16,8 @@
 # COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 # IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
+import os
+import pathlib
 import sys
 from typing import Optional, Dict, Any, Tuple
 
@@ -49,13 +50,22 @@ class MatrixException(Exception):
         return format_response(self.response)
 
 
+def config_path() -> pathlib.Path:
+    path = os.environ.get("WMN_CONFIG_PATH", "./config.yml")
+    path = pathlib.Path(path)
+    path = path.absolute().resolve()
+    if not path.exists():
+        raise RuntimeError("Cannot find config: " + path)
+    return path
+
+
 def load_configuration() -> Cfg:
-    with open("config.yml", "r") as ymlfile:
+    with open(str(config_path()), "r") as ymlfile:
         return yaml.safe_load(ymlfile)
 
 
 def save_configuration(configuration: Cfg):
-    with open("config.yml", "w") as ymlfile:
+    with open(str(config_path()), "w") as ymlfile:
         yaml.safe_dump(configuration, ymlfile)
 
 

wmn/notify.py

@@ -24,9 +24,14 @@ import re
 import sys
 
 import nio
-import yaml
 
-from common import client_login, send_message, resolve_room, MatrixException
+from .common import (
+    client_login,
+    send_message,
+    resolve_room,
+    MatrixException,
+    load_configuration,
+)
 
 # Not going to care for specifics like the underscore.
 # Generally match !anything:example.com with unicode support.
@@ -42,8 +47,7 @@ async def main():
       username: ...
       password: "..."
     """
-    with open("config.yml", "r") as ymlfile:
-        cfg = yaml.safe_load(ymlfile)
+    cfg = load_configuration()
 
     parser = argparse.ArgumentParser(description="Notify a matrix channel.")
     parser.add_argument(

wmn/wmn.py

@@ -24,12 +24,12 @@ import traceback
 from datetime import datetime
 from typing import Tuple, Optional, Dict, Any
 
+import dateutil.parser
 import nio
 from flask import Flask, request, abort
 from werkzeug.datastructures import MultiDict
-import dateutil.parser
 
-from common import (
+from .common import (
     client_login,
     send_message,
     Cfg,