Implement Python sample app

.github/workflows/test.yml

@@ -21,17 +21,25 @@ jobs:
         ports:
           - 8443:8443
     steps:
-      - name: Check out repository
-        uses: actions/checkout@v4
+    - name: Check out repository
+      uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip' # caching pip dependencies
+    - name: Install Python dependencies
+      run: pip install -r requirements.txt
+    - name: Run unit tests
+      run:  python3 -m unittest discover
+    - name: Install fauna-shell
+      run:
+        npm install -g fauna-shell
+    - name: Setup Test Database
+      run: ./test/setup.sh
 
-      - name: Install fauna-shell
-        run:
-          npm install -g fauna-shell
-      - name: Setup Test Database
-        run: ./test/setup.sh
-
-      - name: Test sample app
-        run: |
-          FAUNA_ENDPOINT=http://localhost:8443 FAUNA_SECRET=`cat .fauna_key` python3 app.py > app.log 2>&1  &
-          ./test/validate.sh
-          cat bootrun.log
+    - name: Test sample app
+      run: |
+        FAUNA_ENDPOINT=http://localhost:8443 FAUNA_SECRET=`cat .fauna_key` python3 ecommerce_app/app.py > app.log 2>&1  &
+        ./test/validate.sh
+        cat app.log

.gitignore

@@ -1 +1,12 @@
-myenv/
+myenv/
+venv/
+.idea/*
+
+__pycache__/*
+*/__pycache__/*
+**/__pycache__
+
+**/.DS_Store
+
+**/.env
+.fauna_project

README.md

@@ -0,0 +1,209 @@
+# Fauna Python sample app
+
+This sample app shows how you can use [Fauna](https://fauna.com) in a
+production application.
+
+The app uses Python 3 and the Fauna Python driver to create HTTP API
+endpoints for an e-commerce store. The source code includes comments that highlight
+best practices for the driver and Fauna Query Language (FQL) queries.
+
+This README covers how to set up and run the app locally. For an overview of
+Fauna, see the [Fauna
+docs](https://docs.fauna.com/fauna/current/get_started/overview).
+
+## Highlights
+The sample app demonstrates using several Fauna features:
+
+- **[Document type
+  enforcement](https://docs.fauna.com/fauna/current/learn/schema/#type-enforcement):**
+  Collection schemas enforce a structure for the app's documents. Fauna rejects
+  document writes that don't conform to the schema, ensuring data consistency.
+  [Zero-downtime
+  migrations](https://docs.fauna.com/fauna/current/learn/schema/#schema-migrations)
+  let you safely change the schemas at any time.
+
+- **[Relationships](https://docs.fauna.com/fauna/current/learn/query/relationships/):**
+  Normalized references link documents across collections. The app's queries use
+  [projection](https://docs.fauna.com/fauna/current/reference/fql/projection/)
+  to dynamically retrieve linked documents, even when deeply nested. No complex
+  joins, aggregations, or duplication needed.
+
+- **[Computed
+  fields](https://docs.fauna.com/fauna/current/learn/schema/#computed-fields):**
+  Computed fields dynamically calculate their values at query time. For example,
+  each customer's `orders` field uses a query to fetch a set of filtered orders.
+  Similarly, each order's `total` is calculated at query time based on linked
+  product prices and quantity.
+
+- **[Constraints](https://docs.fauna.com/fauna/current/learn/schema/#unique-constraints):**
+  The app uses constraints to ensure field values are valid. For example, the
+  app uses unique constraints to ensure each customer has a unique email address
+  and each product has a unique name. Similarly, check constraints ensure each
+  customer has only one cart at a time and that product prices are not negative.
+
+- **[User-defined functions
+  (UDFs)](https://docs.fauna.com/fauna/current/learn/data-model/user-defined-functions/):**
+  The app uses UDFs to store business logic as reusable queries. For example,
+  the app uses a `checkout()` UDF to process order updates. `checkout()` calls
+  another UDF, `validateOrderStatusTransition()`, to validate `status`
+  transitions for orders.
+
+## Requirements
+To run the app, you'll need:
+
+- A [Fauna account](https://dashboard.fauna.com/register). You can sign up for a
+  free account at https://dashboard.fauna.com/register.
+
+- Python 3.9 or later 
+
+- [Fauna CLI](https://docs.fauna.com/fauna/current/tools/shell/) v3.0.0 or later.
+
+  To install the CLI, run:
+
+    ```sh
+    npm install -g fauna-shell@latest
+    ```
+
+You should also be familiar with basic Fauna CLI commands and usage. For an
+overview, see the [Fauna CLI
+docs](https://docs.fauna.com/fauna/current/tools/shell/).
+
+## Setup
+
+1. Clone the repo and navigate to the `python-sample-app` directory:
+
+    ```sh
+    git clone [email protected]:fauna/python-sample-app.git
+    cd python-sample-app
+    ```
+2. Setup a Python virtual environment, and install the requirements:
+
+    ```
+   python3 -m venv venv
+   source ./venv/bin/activate
+   pip install -r requirements.txt
+   ```
+
+3. Log in to Fauna using the Fauna CLI:
+
+    ```sh
+    fauna cloud-login
+    ```
+
+   When prompted, enter:
+
+    * **Endpoint name:** `cloud` (Press Enter)
+    * **Email address:** The email address for your Fauna account.
+    * **Password:** The password for your Fauna account.
+    * **Which endpoint would you like to set as default?** The `cloud-*`
+      endpoint for your preferred region group. For example, to use the US
+      region group, use `cloud-us`.
+
+   The command requires an email and password login. If you log in to Fauna
+   using GitHub or Netlify, you can enable email and password login using the
+   [Forgot Password](https://dashboard.fauna.com/forgot-password) workflow.
+
+4. Use the Fauna CLI to create the `ECommercePython` database:
+
+    ```sh
+    fauna create-database ECommercePython
+    ```
+
+5. Create a
+   [`.fauna-project`](https://docs.fauna.com/fauna/current/tools/shell/#proj-config)
+   config file for the project:
+
+   ```sh
+   fauna project init
+   ```
+
+   When prompted, enter:
+
+    * `schema` as the schema directory.
+    * `dev` as the environment name.
+    * The default endpoint.
+    * `ECommercePython` as the database.
+
+6.  Push the `.fsl` files in the `schema` directory to the `ECommercePython`
+    database:
+
+    ```sh
+    fauna schema push
+    ```
+
+    When prompted, accept and stage the schema.
+
+7.  Check the status of the staged schema:
+
+    ```sh
+    fauna schema status
+    ```
+
+8.  When the status is `ready`, commit the staged schema to the database:
+
+    ```sh
+    fauna schema commit
+    ```
+
+    The commit applies the staged schema to the database. The commit creates the
+    collections and user-defined functions (UDFs) defined in the `.fsl` files of the
+    `schema` directory.
+
+9. Create a key with the `server` role for the `ECommercePython` database:
+
+    ```sh
+    fauna create-key --environment='' ECommercePython server
+    ```
+
+   Copy the returned `secret`. The app can use the key's secret to authenticate
+   requests to the database.
+
+## Run the app
+
+The app runs an HTTP API server. From the root directory, run:
+
+```sh
+FAUNA_SECRET=<secret> python ecommerce_app/app.py
+```
+
+Once started, the local server is available at http://localhost:5000
+
+The script `./tests/validate.sh` has some example HTTP requests.
+
+
+## Make HTTP API requests
+
+```
+
+You can use the endpoints to make API requests that read and write data from
+the `ECommerce` database.
+
+For example, with the local server running in a separate terminal tab, run the
+following curl request to the `POST /customers` endpoint. The request creates a
+`Customer` collection document in the `ECommerce` database.
+
+curl -v \
+  http://localhost:5000/customers \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "Alice Appleseed",
+    "email": "[email protected]",
+    "address": {
+      "street": "87856 Mendota Court",
+      "city": "Washington",
+      "state": "DC",
+      "postalCode": "20220",
+      "country": "USA"
+    }
+  }'
+```
+
+You can view the documents for the collection in the [Fauna
+Dashboard](https://dashboard.fauna.com/).
+
+## Run tests
+
+Python unit tests:
+```sh
+python3 -m unittest discover -s tests
+```