CI: Add job configuration for "python-flask"

.github/workflows/test-python-flask.yml

@@ -0,0 +1,63 @@
+name: Python / Flask
+
+on:
+  pull_request:
+    branches: ~
+    paths:
+    - '.github/workflows/test-python-flask.yml'
+    - 'python-flask/**'
+    - 'requirements.txt'
+  push:
+    branches: [ main ]
+    paths:
+    - '.github/workflows/test-python-flask.yml'
+    - 'python-flask/**'
+    - 'requirements.txt'
+
+  # Allow job to be triggered manually.
+  workflow_dispatch:
+
+  # Run job each night after CrateDB nightly has been published.
+  schedule:
+    - cron: '0 3 * * *'
+
+# Cancel in-progress jobs when pushing to the same branch.
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  test:
+    name: "
+     Python: ${{ matrix.python-version }}
+     CrateDB: ${{ matrix.cratedb-version }}
+     on ${{ matrix.os }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ 'ubuntu-latest' ]
+        python-version: [ '3.8', '3.12' ]
+        cratedb-version: [ 'nightly' ]
+
+    steps:
+
+      - name: Acquire sources
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+          cache: 'pip'
+          cache-dependency-path: |
+            python-flask/pyproject.toml
+
+      - name: Install utilities
+        run: |
+          pip install -r requirements.txt
+
+      - name: Validate python-flask
+        run: |
+          ngr test --accept-no-venv python-flask

.gitignore

@@ -1,3 +1,4 @@
 .idea
 !go-gin/.idea
 .venv*
+*.pyc

python-flask/app.py

@@ -24,6 +24,7 @@
 import base64
 import hashlib
 import typing as t
+import sys
 
 from datetime import datetime
 from tempfile import TemporaryFile
@@ -400,4 +401,9 @@ def run():
 
 
 if __name__ == '__main__':
+    if "--info" in sys.argv[1:]:
+        from importlib.metadata import version
+        app_version = version("cratedb-python-flask-guestbook-demo")
+        print(f"Backend API implementation of the CrateDB guestbook demo application, version {app_version}")
+        sys.exit(0)
     run()

python-flask/pyproject.toml

@@ -23,3 +23,8 @@ install = [
 run = [
   {cmd=".venv/bin/python app.py"},
 ]
+check = [
+  {cmd="python -m py_compile app.py"},
+  {cmd="ruff --ignore=E713 app.py"},
+  {cmd="python app.py --info"},
+]

python-flask/requirements-dev.txt

@@ -0,0 +1,2 @@
+poethepoet<0.25
+ruff==0.1.6