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Introduction

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.8+ based on standard Python type hints.

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Prerequisites

  • a UNIX-like system (see WSL if you are using Windows), in order to use the Valyent CLI
  • a Valyent account, with a registered payment method (you can sign up here)
  • Python3 and installed on your machine

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Installing the CLI

curl -L https://cli.valyent.cloud/install.sh | sh

You can inspect the installation script here and the GitHub repository.

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Authenticating

valyent auth login

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Initializing the project

In the first place, we are going to install FastAPI dependencies. You can refer to the official documentation for more information.

pip install fastapi
pip install uvicorn[standard]

Then, we can scaffold a new FastAPI project :

mkdir -p fastapi-testing/app && cd fastapi-testing && touch app/main.py

Make sure to create a requirements.txt file, in order to install the dependencies in the Docker image :

touch requirements.txt

For this example, we are going to use the following dependencies :

# requirements.txt
fastapi>=0.68.0,<0.69.0
pydantic>=1.8.0,<2.0.0
uvicorn>=0.15.0,<0.16.0

In the app/main.py file, we can add the following code :

# app/main.py
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
  return {"Hello": "World"}

Now, we can initialize the valyent.toml configuration file, that allows to link the local codebase, to a Valyent application :

valyent init

This command will ask you to select/create a project and an associated application.

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Adding the Dockerfile

Let’s add a Dockerfile so that Valyent can build a Docker image for your application.

touch Dockerfile

We can fill it with the following Dockerfile (coming from here) :

FROM python:3.9

WORKDIR /code

COPY ./requirements.txt /code/requirements.txt

RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt

COPY ./app /code/app

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"]

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Deploy the project

Valyent makes use of the PORT environment variable to determine which port to expose. We can set it with the following command :

valyent env set PORT=80

Then, we can deploy the application :

valyent deploy

Once the deployment is finished, type :

valyent open

to test your FastAPI application in your browser.

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