provide example flask project

docker-compose.prod.yml

@@ -1,14 +1,14 @@
 version: '3.8'
 
 services:
-  web:
+  flask:
     build:
-      context: ./services/web
+      context: ./flask
       dockerfile: Dockerfile.prod
     command: gunicorn --bind 0.0.0.0:5000 manage:app
     volumes:
-      - static_volume:/home/app/web/project/static
+      - static_volume:/home/app/web/forest/static
-      - media_volume:/home/app/web/project/media
+      - media_volume:/home/app/web/forest/media
     expose:
       - 5000
     env_file:
@@ -22,10 +22,10 @@ services:
     env_file:
       - ./.env.prod
   nginx:
-    build: ./services/nginx
+    build: ./nginx
     volumes:
-      - static_volume:/home/app/web/project/static
+      - static_volume:/home/app/web/forest/static
-      - media_volume:/home/app/web/project/media
+      - media_volume:/home/app/web/forest/media
     ports:
       - 1337:80
     depends_on:

docker-compose.yml

@@ -1,11 +1,11 @@
 version: '3.8'
 
 services:
-  web:
+  flask:
-    build: ./services/web
+    build: ./flask
     command: python manage.py run -h 0.0.0.0
     volumes:
-      - ./services/web/:/usr/src/app/
+      - ./flask/:/usr/src/app/
     ports:
       - 5000:5000
     env_file:

flask/Dockerfile

@@ -0,0 +1,23 @@
+# pull official base image
+FROM python:3.9.5-slim-buster
+
+# set work directory
+WORKDIR /usr/src/app
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# install system dependencies
+RUN apt-get update && apt-get install -y netcat
+
+# install dependencies
+RUN pip install --upgrade pip
+COPY ./requirements.txt /usr/src/app/requirements.txt
+RUN pip install -r requirements.txt
+
+# copy project
+COPY . /usr/src/app/
+
+# run entrypoint.sh
+ENTRYPOINT ["/usr/src/app/entrypoint.sh"]

flask/Dockerfile.prod

@@ -0,0 +1,69 @@
+###########
+# BUILDER #
+###########
+
+# pull official base image
+FROM python:3.9.5-slim-buster as builder
+
+# set work directory
+WORKDIR /usr/src/app
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# install system dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc
+
+# lint
+RUN pip install --upgrade pip
+RUN pip install flake8==3.9.1
+COPY . /usr/src/app/
+RUN flake8 --ignore=E501,F401 .
+
+# install python dependencies
+COPY ./requirements.txt .
+RUN pip wheel --no-cache-dir --no-deps --wheel-dir /usr/src/app/wheels -r requirements.txt
+
+
+#########
+# FINAL #
+#########
+
+# pull official base image
+FROM python:3.9.5-slim-buster
+
+# create directory for the app user
+RUN mkdir -p /home/app
+
+# create the app user
+RUN addgroup --system app && adduser --system --group app
+
+# create the appropriate directories
+ENV HOME=/home/app
+ENV APP_HOME=/home/app/web
+RUN mkdir $APP_HOME
+WORKDIR $APP_HOME
+
+# install dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends netcat
+COPY --from=builder /usr/src/app/wheels /wheels
+COPY --from=builder /usr/src/app/requirements.txt .
+RUN pip install --upgrade pip
+RUN pip install --no-cache /wheels/*
+
+# copy entrypoint-prod.sh
+COPY ./entrypoint.prod.sh $APP_HOME
+
+# copy project
+COPY . $APP_HOME
+
+# chown all the files to the app user
+RUN chown -R app:app $APP_HOME
+
+# change to the app user
+USER app
+
+# run entrypoint.prod.sh
+ENTRYPOINT ["/home/app/web/entrypoint.prod.sh"]

flask/entrypoint.prod.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ "$DATABASE" = "postgres" ]
+then
+    echo "Waiting for postgres..."
+
+    while ! nc -z $SQL_HOST $SQL_PORT; do
+      sleep 0.1
+    done
+
+    echo "PostgreSQL started"
+fi
+
+exec "$@"

flask/entrypoint.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if [ "$DATABASE" = "postgres" ]
+then
+    echo "Waiting for postgres..."
+
+    while ! nc -z $SQL_HOST $SQL_PORT; do
+      sleep 0.1
+    done
+
+    echo "PostgreSQL started"
+fi
+
+python manage.py create_db
+
+exec "$@"

flask/forest/__init__.py

@@ -0,0 +1,57 @@
+import os
+
+from werkzeug.utils import secure_filename
+from flask import (
+    Flask,
+    jsonify,
+    send_from_directory,
+    request,
+    redirect,
+    url_for
+)
+from flask_sqlalchemy import SQLAlchemy
+
+app = Flask(__name__)
+app.config.from_object("project.config.Config")
+db = SQLAlchemy(app)
+
+
+class User(db.Model):
+    __tablename__ = "users"
+
+    id = db.Column(db.Integer, primary_key=True)
+    email = db.Column(db.String(128), unique=True, nullable=False)
+    active = db.Column(db.Boolean(), default=True, nullable=False)
+
+    def __init__(self, email):
+        self.email = email
+
+
+@app.route("/")
+def hello_world():
+    return jsonify(hello="world")
+
+
+@app.route("/static/<path:filename>")
+def staticfiles(filename):
+    return send_from_directory(app.config["STATIC_FOLDER"], filename)
+
+
+@app.route("/media/<path:filename>")
+def mediafiles(filename):
+    return send_from_directory(app.config["MEDIA_FOLDER"], filename)
+
+
+@app.route("/upload", methods=["GET", "POST"])
+def upload_file():
+    if request.method == "POST":
+        file = request.files["file"]
+        filename = secure_filename(file.filename)
+        file.save(os.path.join(app.config["MEDIA_FOLDER"], filename))
+    return """
+    <!doctype html>
+    <title>upload new File</title>
+    <form action="" method=post enctype=multipart/form-data>
+      <p><input type=file name=file><input type=submit value=Upload>
+    </form>
+    """

flask/forest/config.py

@@ -0,0 +1,11 @@
+import os
+
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+
+class Config(object):
+    SQLALCHEMY_DATABASE_URI = os.getenv("DATABASE_URL", "sqlite://")
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    STATIC_FOLDER = f"{os.getenv('APP_FOLDER')}/forest/static"
+    MEDIA_FOLDER = f"{os.getenv('APP_FOLDER')}/forest/media"

flask/forest/static/hello.txt

@@ -0,0 +1 @@
+hi!

flask/manage.py

@@ -0,0 +1,23 @@
+from flask.cli import FlaskGroup
+
+from project import app, db, User
+
+
+cli = FlaskGroup(app)
+
+
+@cli.command("create_db")
+def create_db():
+    db.drop_all()
+    db.create_all()
+    db.session.commit()
+
+
+@cli.command("seed_db")
+def seed_db():
+    db.session.add(User(email="daniel@deflax.net"))
+    db.session.commit()
+
+
+if __name__ == "__main__":
+    cli()

flask/requirements.txt

@@ -0,0 +1,4 @@
+Flask==1.1.2
+Flask-SQLAlchemy==2.5.1
+gunicorn==20.1.0
+psycopg2-binary==2.8.6

nginx/Dockerfile

@@ -0,0 +1,4 @@
+FROM nginx:1.19-alpine
+
+RUN rm /etc/nginx/conf.d/default.conf
+COPY nginx.conf /etc/nginx/conf.d

nginx/nginx.conf

@@ -0,0 +1,24 @@
+upstream forest {
+    server flask:5000;
+}
+
+server {
+
+    listen 80;
+
+    location / {
+        proxy_pass http://forest;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header Host $host;
+        proxy_redirect off;
+    }
+
+    location /static/ {
+        alias /home/app/web/project/static/;
+    }
+
+    location /media/ {
+        alias /home/app/web/project/media/;
+    }
+
+}