Add support for dynamic build matrix generation

.github/workflows/checks.yml

@@ -40,14 +40,17 @@ jobs:
         run: |
           poetry run python -m nox -s docs:build
 
+  build-matrix:
+    name: Generate Build Matrix
+    uses: ./.github/workflows/matrix-python.yml
+
   Lint:
     name: Linting (Python-${{ matrix.python-version }})
-    needs: [ Version-Check ]
+    needs: [ Version-Check, build-matrix ]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+      matrix: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
 
     steps:
       - name: SCM Checkout
@@ -70,12 +73,11 @@ jobs:
 
   Type-Check:
     name: Type Checking (Python-${{ matrix.python-version }})
-    needs: [ Version-Check ]
+    needs: [ Version-Check, build-matrix ]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+      matrix: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
 
     steps:
       - name: SCM Checkout
@@ -91,12 +93,11 @@ jobs:
 
   Security:
     name: Security Checks (Python-${{ matrix.python-version }})
-    needs: [ Version-Check ]
+    needs: [ Version-Check, build-matrix ]
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+      matrix: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
 
     steps:
       - name: SCM Checkout
@@ -134,16 +135,14 @@ jobs:
         run: poetry run nox -s project:format
 
   Tests:
-    name: Unit-Tests (Python-${{ matrix.python-version }}, Exasol-${{ matrix.exasol-version}})
-    needs: [ Documentation, Lint, Type-Check, Security, Format]
+    name: Unit-Tests (Python-${{ matrix.python-version }})
+    needs: [ Documentation, Lint, Type-Check, Security, Format, build-matrix ]
     runs-on: ubuntu-latest
     env:
       GITHUB_TOKEN: ${{ secrets.ALTERNATIVE_GITHUB_TOKEN ||  secrets.GITHUB_TOKEN }}
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
-        exasol-version: [ "7.1.9" ]
+      matrix: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
 
     steps:
       - name: SCM Checkout
@@ -155,7 +154,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Run Tests and Collect Coverage
-        run: poetry run nox -s test:unit -- -- --coverage --db-version ${{ matrix.exasol-version }}
+        run: poetry run nox -s test:unit -- -- --coverage
 
       - name: Upload Artifacts
         uses: actions/[email protected]

.github/workflows/matrix-all.yml

@@ -0,0 +1,30 @@
+name: Build Matrix (All Versions)
+
+on:
+  workflow_call:
+    outputs:
+      matrix:
+        description: "Generates the all versions build matrix"
+        value: ${{ jobs.all_versions.outputs.matrix }}
+
+jobs:
+  all_versions:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SCM Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python & Poetry Environment
+        uses: ./.github/actions/python-environment
+
+      - name: Generate matrix
+        run: poetry run nox -s matrix:all
+
+      - id: set-matrix
+        run: |
+          echo "matrix=$(poetry run nox -s matrix:all)" >> $GITHUB_OUTPUT
+
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}

.github/workflows/matrix-exasol.yml

@@ -0,0 +1,30 @@
+name: Build Matrix (Exasol)
+
+on:
+  workflow_call:
+    outputs:
+      matrix:
+        description: "Generates the exasol version build matrix"
+        value: ${{ jobs.exasol_versions.outputs.matrix }}
+
+jobs:
+  exasol_versions:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SCM Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python & Poetry Environment
+        uses: ./.github/actions/python-environment
+
+      - name: Generate matrix
+        run: poetry run nox -s matrix:exasol
+
+      - id: set-matrix
+        run: |
+          echo "matrix=$(poetry run nox -s matrix:exasol)" >> $GITHUB_OUTPUT
+
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}

.github/workflows/matrix-python.yml

@@ -0,0 +1,30 @@
+name: Build Matrix (Python)
+
+on:
+  workflow_call:
+    outputs:
+      matrix:
+        description: "Generates the python version build matrix"
+        value: ${{ jobs.python_versions.outputs.matrix }}
+
+jobs:
+  python_versions:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SCM Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python & Poetry Environment
+        uses: ./.github/actions/python-environment
+
+      - name: Generate matrix
+        run: poetry run nox -s matrix:python
+
+      - id: set-matrix
+        run: |
+          echo "matrix=$(poetry run nox -s matrix:python)" >> $GITHUB_OUTPUT
+
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}

.github/workflows/slow-checks.yml

@@ -8,8 +8,13 @@ on:
 
 jobs:
 
+  build-matrix:
+    name: Generate Build Matrix
+    uses: ./.github/workflows/matrix-all.yml
+
   Tests:
     name: Integration-Tests (Python-${{ matrix.python-version }}, Exasol-${{ matrix.exasol-version}})
+    needs: [ build-matrix ]
     runs-on: ubuntu-latest
     # Even though the environment "manual-approval" will be created automatically,
     # it still needs to be configured to require interactive review.
@@ -19,9 +24,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.ALTERNATIVE_GITHUB_TOKEN ||  secrets.GITHUB_TOKEN }}
     strategy:
       fail-fast: false
-      matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
-        exasol-version: [ "7.1.9" ]
+      matrix: ${{ fromJson(needs.build-matrix.outputs.matrix) }}
 
     steps:
       - name: SCM Checkout

doc/changes/unreleased.md

@@ -1,9 +1,42 @@
 # Unreleased
 
+## 🚨 Breaking Changes
+* **Matrices in CI/CD workflows will be generated automatically now**
+
+    Make sure you have installed all the latest workflow files, especially the newly added ones:
+
+    - `matrix-all.yml`
+    - `matrix-python.yml`
+    - `matrix-exasol.yml`
+
+
+## ✨ Added
+* Added support for dynamically generated workflow matrices.
+
+    This feature allows you to easily change the test matrices in one place: `noxconfig.py`.
+
+    Note: As usual, there are different ways a user can adjust or change the behavior. In the case of the build matrices, there are three obvious ways:
+
+    - Set the appropriate fields in the `noxconfig.py` project configuration (`PROJECT_CONFIG`):
+        * `python_versions = [ ... ]`
+        * `exasol_versions = [ ... ]`
+    - Overwrite the nox tasks:
+        * `matrix:all`
+        * `matrix:python`
+        * `matrix:exasol`
+    - Overwrite/replace the matrix generation workflows:
+        * `matrix-all.yml`
+        * `matrix-python.yml`
+        * `matrix-exasol.yml`
+
+    Among all of the above, the safest way is to set the matrix-related fields in your project config object in `noxconfig.py`.
+
+
 ## 📚 Documentation
 
 * Added new entries to the frequently asked questions regarding `multiversion documentation`
 
+
 ## 🐞 Fixed
 
 * Added multi-version extension to Sphinx configuration of the project template

exasol/toolbox/nox/_ci.py

@@ -0,0 +1,59 @@
+import json
+import logging
+
+import nox
+from nox import Session
+
+from noxconfig import (
+    PROJECT_CONFIG,
+    Config,
+)
+
+_log = logging.getLogger(__name__)
+
+_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12"]
+_EXASOL_VERSIONS = ["7.1.9"]
+
+
+def _python_matrix(config: Config):
+    attr = "python_versions"
+    python_versions = getattr(config, attr, _PYTHON_VERSIONS)
+    if not hasattr(config, attr):
+        _log.warning(
+            "Config does not contain '%s' setting. Using default: %s",
+            attr,
+            _PYTHON_VERSIONS,
+        )
+    return {"python-version": python_versions}
+
+
+def _exasol_matrix(config: Config):
+    attr = "exasol_versions"
+    exasol_versions = getattr(config, attr, _EXASOL_VERSIONS)
+    if not hasattr(config, attr):
+        _log.warning(
+            "Config does not contain '%s' setting. Using default: %s",
+            attr,
+            _EXASOL_VERSIONS,
+        )
+    return {"exasol-version": exasol_versions}
+
+
+@nox.session(name="matrix:python", python=False)
+def python_matrix(session: Session) -> None:
+    """Output the build matrix for Python versions as JSON."""
+    print(json.dumps(_python_matrix(PROJECT_CONFIG)))
+
+
+@nox.session(name="matrix:exasol", python=False)
+def exasol_matrix(session: Session) -> None:
+    """Output the build matrix for Exasol versions as JSON."""
+    print(json.dumps(_exasol_matrix(PROJECT_CONFIG)))
+
+
+@nox.session(name="matrix:all", python=False)
+def full_matrix(session: Session) -> None:
+    """Output the full build matrix for Python & Exasol versions as JSON."""
+    matrix = _python_matrix(PROJECT_CONFIG)
+    matrix.update(_exasol_matrix(PROJECT_CONFIG))
+    print(json.dumps(matrix))

exasol/toolbox/nox/tasks.py

@@ -59,14 +59,20 @@ def check(session: Session) -> None:
     clean_docs,
     open_docs,
 )
-from exasol.toolbox.nox._release import prepare_release
 from exasol.toolbox.nox._shared import (
     Mode,
     _context,
     _version,
     python_files,
 )
 
+from exasol.toolbox.nox._ci import (
+    python_matrix,
+    exasol_matrix,
+    full_matrix,
+)
+
+from exasol.toolbox.nox._release import prepare_release
 
 # isort: on
 # fmt: on