fix(#259): docker-compose error on building sample project.

Dockerfile

@@ -1,21 +1,20 @@
-FROM python:3.8-alpine
+FROM python:3.10-slim-bullseye
 
-RUN apk update \
-    && apk add --virtual build-deps gcc python3-dev musl-dev \
-    && apk add bash \
-    && apk add postgresql \
-    && apk add postgresql-dev \
-    && pip install psycopg2 \
-    && apk add jpeg-dev zlib-dev libjpeg \
-    && pip install Pillow \
-    && apk del build-deps
+# Install apt packages
+RUN apt-get update && apt-get install --no-install-recommends -y \
+  # dependencies for building Python packages
+  build-essential \
+  # psycopg2 dependencies
+  libpq-dev \
+  # Translations dependencies
+  gettext \
+  # cleaning up unused files
+  && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+  && rm -rf /var/lib/apt/lists/*
 
-WORKDIR /code/
 COPY . /code/
 WORKDIR /code/
 
-RUN pip install -r /code/test/example/requirements.txt
-
-RUN apk add --no-cache postgresql-libs
-
-ENTRYPOINT ["/code/docker-entrypoint.sh"]
+RUN pip install -r /code/test/example/requirements.txt \
+    && pip install psycopg2 \
+    && python -m pip install django-comments-dab[markdown]

docker-compose.yml

@@ -6,7 +6,9 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
-    command: python manage.py runserver 0.0.0.0:8000
+    command: >
+      bash -c "python wait_for_postgres.py &&
+              /code/docker-entrypoint.sh"
     ports:
       - "8000:8000"
     volumes:
@@ -26,7 +28,7 @@ services:
       DB_PORT: 5432
       DB_USER: postgres
   db:
-    image: postgres:9.6
+    image: postgres:14
     ports:
       - "5432:5432"
     environment:

test/example/requirements.txt

@@ -9,4 +9,4 @@ beautifulsoup4
 cssselect
 coverage
 flake8
-tox
+tox 

wait_for_postgres.py

@@ -0,0 +1,36 @@
+import os
+import logging
+from time import time, sleep
+import psycopg2
+check_timeout = os.getenv("POSTGRES_CHECK_TIMEOUT", 30)
+check_interval = os.getenv("POSTGRES_CHECK_INTERVAL", 1)
+interval_unit = "second" if check_interval == 1 else "seconds"
+config = {
+    "dbname": os.getenv("DB_NAME", "postgres"),
+    "user": os.getenv("DB_USER", "postgres"),
+    "password": os.getenv("DB_PASSWORD", "django-comments-dab"),
+    "host": os.getenv("DB_HOST", "db")
+}
+
+start_time = time()
+logger = logging.getLogger()
+logger.setLevel(logging.INFO)
+logger.addHandler(logging.StreamHandler())
+
+
+def pg_isready(host, user, password, dbname):
+    while time() - start_time < check_timeout:
+        try:
+            conn = psycopg2.connect(**vars())
+            logger.info("Postgres is ready! ✨ 💅")
+            conn.close()
+            return True
+        except psycopg2.OperationalError:
+            logger.info(f"Postgres isn't ready. Waiting for {check_interval} {interval_unit}...")
+            sleep(check_interval)
+
+    logger.error(f"We could not connect to Postgres within {check_timeout} seconds.")
+    return False
+
+
+pg_isready(**config)