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Merge pull request #594 from DefangLabs/jordan/strands-dockerfile
Create a Dockerfile for strands sample
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‎.github/workflows/deploy.yaml‎

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name: Deploy
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on:
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push:
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branches:
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- main
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jobs:
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deploy:
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environment: playground
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runs-on: ubuntu-latest
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permissions:
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contents: read
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id-token: write
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steps:
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- name: Checkout Repo
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uses: actions/checkout@v4
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- name: Deploy
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uses: DefangLabs/defang-github-action@v1.3.2

‎README.md‎

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# Flask & Form Submission
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[![1-click-deploy](https://raw.githubusercontent.com/DefangLabs/defang-assets/main/Logos/Buttons/SVG/deploy-with-defang.svg)](https://portal.defang.dev/redirect?url=https%3A%2F%2Fgithub.com%2Fnew%3Ftemplate_name%3Dsample-python-form-template%26template_owner%3DDefangSamples)
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This Flask application provides a basic example of handling form submissions. It displays an HTML form where users can input their first name. Upon submission, the application greets the user by name on a new page. Note that alognside your .py file, include a requirements.txt so that the Dockerfile can install the necessary packages with pip.
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## Essential Setup Files
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1. A [Dockerfile](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/).
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2. A [compose file](https://docs.defang.io/docs/concepts/compose) to define and run multi-container Docker applications (this is how Defang identifies services to be deployed). (compose.yaml file)
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## Prerequisite
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1. Download [Defang CLI](https://github.com/DefangLabs/defang)
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2. If you are using [Defang BYOC](https://docs.defang.io/docs/concepts/defang-byoc), make sure you have properly [authenticated your AWS account (optional)](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-configure.html)
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## A Step-by-Step Guide
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1. Open the terminal and type `defang login`
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2. Type `defang compose up` in the CLI
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3. Your app should be up and running with Defang in minutes!
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---
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Title: Python & Form
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Short Description: A short Python example for form submission in Flask.
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Tags: Python, Flask, Form
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Languages: python

‎app/.gitignore‎

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# --- Python ---
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# Byte-compiled / optimized / DLL files
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__pycache__/
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*.py[cod]
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*$py.class
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# C extensions
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*.so
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# Distribution / packaging
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.Python
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build/
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develop-eggs/
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dist/
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downloads/
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eggs/
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.eggs/
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lib/
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lib64/
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parts/
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sdist/
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var/
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wheels/
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share/python-wheels/
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*.egg-info/
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.installed.cfg
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*.egg
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MANIFEST
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# PyInstaller
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*.manifest
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*.spec
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# Installer logs
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pip-log.txt
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pip-delete-this-directory.txt
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# Unit test / coverage reports
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htmlcov/
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.tox/
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.nox/
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.coverage
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.coverage.*
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.cache
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nosetests.xml
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coverage.xml
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*.cover
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*.py,cover
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.hypothesis/
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.pytest_cache/
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cover/
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# Translations
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*.mo
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*.pot
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# Django stuff:
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*.log
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local_settings.py
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db.sqlite3
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db.sqlite3-journal
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# Flask stuff:
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instance/
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.webassets-cache
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# Scrapy stuff:
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.scrapy
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# Sphinx documentation
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docs/_build/
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# PyBuilder
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.pybuilder/
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target/
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# Jupyter Notebook
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.ipynb_checkpoints
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# IPython
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profile_default/
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ipython_config.py
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# pdm
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.pdm.toml
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.pdm-python
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.pdm-build/
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# PEP 582
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__pypackages__/
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# Celery stuff
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celerybeat-schedule
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celerybeat.pid
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# SageMath parsed files
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*.sage.py
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# Environments
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.env
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.venv
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env/
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venv/
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ENV/
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env.bak/
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venv.bak/
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# Spyder project settings
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.spyderproject
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.spyproject
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# Rope project settings
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.ropeproject
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# mkdocs documentation
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/site
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# mypy
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.mypy_cache/
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.dmypy.json
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dmypy.json
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# Pyre type checker
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.pyre/
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# pytype static type analyzer
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.pytype/
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# Cython debug symbols
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cython_debug/
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# PyCharm
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.idea/

‎app/Dockerfile‎

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# Use an official Python runtime as a parent image
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FROM python:3.11-slim
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# Set the working directory to /app
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WORKDIR /app
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# Install required C++11 libraries and ca-certificates
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RUN apt-get update -qq \
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&& apt-get install -y \
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build-essential \
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python3-dev \
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ca-certificates \
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curl \
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&& apt-get clean \
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&& rm -rf /var/lib/apt/lists/*
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# Install any needed packages specified in requirements.txt
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COPY requirements.txt /app/
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RUN pip install --no-cache-dir -r requirements.txt
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# Copy the current directory contents into the container at /app
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COPY . /app
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# Make port 5000 available to the world outside this container
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EXPOSE 5000
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# Run main when the container launches
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ENTRYPOINT ["uwsgi", "--http", "0.0.0.0:5000", "--master", "-p", "2", "-w", "main:app"]
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USER nobody

‎app/main.py‎

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from flask import Flask
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from flask import request
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app = Flask(__name__)
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@app.route("/")
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def index():
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# Set response header to HTML
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headers = {
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"Content-Type": "text/html",
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}
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# Declare the HTML to return via the response
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content = """
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<!DOCTYPE html>
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<html>
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<head>
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<title>Simple form post</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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margin: 20px;
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}
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label {
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font-weight: bold;
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}
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input[type="text"] {
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padding: 5px;
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margin-bottom: 10px;
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width: 200px;
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}
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input[type="submit"] {
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padding: 10px 20px;
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background-color: #4CAF50;
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color: white;
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border: none;
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cursor: pointer;
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}
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</style>
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</head>
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<body>
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<h1>Simple form post</h1>
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<form action="/submit" method="post">
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<label for="first_name">First name:</label><br>
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<input type="text" id="first_name" name="first_name"><br>
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<input type="submit" value="Submit">
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</form>
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</body>
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</html>
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"""
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# Return the HTML
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return content, 200, headers
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@app.route("/submit", methods=["POST"])
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def submit():
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# Set response header to HTML
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headers = {
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"Content-Type": "text/html",
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}
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# Get the form data
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first_name = request.form.get('first_name')
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# Declare the HTML to return via the response
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content = """
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<html>
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<head>
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<title>Simple form post</title>
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</head>
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<body>
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<h1>Hello {}!</h1>
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</body>
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</html>
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""".format(first_name)
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# Return the HTML
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return content, 200, headers
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if __name__ == '__main__':
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app.run(debug=True, host='0.0.0.0')

‎app/requirements.txt‎

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uwsgi
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flask

‎compose.yaml‎

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name: python-form
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services:
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app:
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restart: unless-stopped
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build:
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context: ./app
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dockerfile: Dockerfile
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ports:
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- mode: ingress
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target: 5000
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deploy:
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resources:
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reservations:
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memory: 256M
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healthcheck:
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test:
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- CMD
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- curl
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- -f
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- http://localhost:5000/

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