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Contributing to Measurement Plug-In SDK for Python

Contributions to Measurement Plug-In SDK for Python are welcome from all!

Measurement Plug-In SDK for Python is managed via git, with the canonical upstream repository hosted on GitHub. The repo contains templates and examples for developing measurement plug-ins in Python.

Measurement Plug-In SDK for Python follows a pull-request model for development. If you wish to contribute, you will need to create a GitHub account, fork this project, push a branch with your changes to your project, and then submit a pull request.

Please remember to sign off your commits (e.g., by using git commit -s if you are using the command-line client). This amends your git commit message with a line of the form Signed-off-by: Name LastName <name.lastmail@emailaddress.com>. Please include all authors of any given commit into the commit message with a Signed-off-by line. This indicates that you have read and signed the Developer Certificate of Origin (see below) and can legally submit your code to this repository.

See GitHub's official documentation for more details.

Getting Started

Prerequisites

Clone or Update the Git Repository

To download the Measurement Plug-In SDK for Python source, clone its Git repository to your local PC.

git clone --recurse-submodules https://github.com/ni/measurement-plugin-python.git

Specifying --recurse-submodules includes the ni-apis repository. This is required for the update gRPC stubs workflow.

If you already have the Git repository on your local PC, you can update it and its submodules.

git checkout main
git pull
git submodule update --init --recursive

Select a Package to Develop

The Measurement Plug-In SDK for Python includes multiple Python packages:

Open a terminal window and cd to the package that you want to develop.

cd packages\service

Install the Package and Its Dependencies

From the package's subdirectory, run the poetry install command. This creates an in-project virtual environment (.venv) and installs the package's dependencies and dev-dependencies, as specified in its pyproject.toml and poetry.lock files.

poetry install

For ni_measurement_plugin_sdk_service, you may also want to install the package's extra dependencies. This will install the NI driver API packages that are supported for session management.

poetry install --all-extras

Activate the Virtual Environment (If Needed)

  • (Preferred) Prefix commands with poetry run, e.g. poetry run python measurement.py
  • In the command prompt: poetry shell
  • In VS Code (link)

Update gRPC Stubs (If Needed)

The packages/service/ni_measurement_plugin_sdk_service/_internal/stubs directory contains the auto-generated Python files based on Measurement Plug-In protobuf (.proto) files. The file needs to be replaced whenever there is a change to these .proto files:

  • ni/measurementlink/**/*.proto
  • ni/grpcdevice/v1/session.proto

The latest .proto files are available in the ni-apis repo. This repo includes the ni-apis repo as a Git submodule in third_party/ni-apis.

To regenerate the gRPC stubs, cd to the packages/service directory, install it with poetry install, and run poetry run python scripts/generate_grpc_stubs.py. This generates the required .py files for the listed .proto files. The required grpcio-tools package is already added as a development dependency in pyproject.toml.

Lint and Build Code

Lint Code for Style and Formatting

Use ni-python-styleguide to lint the code for style and formatting. This runs other tools such as flake8, pycodestyle, and black.

poetry run ni-python-styleguide lint

If there are any failures, try using ni-python-styleguide to fix them, then lint the code again. If ni-python-styleguide doesn't fix the failures, you will have to manually fix them.

poetry run ni-python-styleguide fix
poetry run ni-python-styleguide lint

Mypy Type Checking

Use Mypy to type check the code.

poetry run mypy

Bandit Security Checks

Use Bandit to check for common security issues.

poetry run bandit -c pyproject.toml -r ni_measurement_plugin_sdk_service

For the exact command line for each package, see the corresponding Github workflows: check_nimg.yml check_nims.yml

Build Distribution Packages

To build distribution packages, run poetry build. This generates installable distribution packages (source distributions and wheels) in the dist subdirectory.

poetry build

Build Documentation

The ni_measurement_plugin_sdk_service package uses Sphinx to build API reference documentation.

poetry run sphinx-build _docs_source docs -b html -W --keep-going

The generated documentation is at docs/index.html.

Testing

ni-measurement-plugin-sdk-service includes regression tests under the tests/ directory. The GitHub CI runs these tests for PRs targeting the main branch. It is recommended that during development you run the tests locally before creating a PR.

Some of the regression tests require InstrumentStudio and NI drivers to be installed.

In order to run the ni-measurement-plugin-sdk-service tests locally:

Using Command Line

  1. Install production dependencies and development dependencies into a venv by running poetry install --all-extras.

  2. Some tests will be skipped if the required components included with InstrumentStudio are not installed. Install the latest version of InstrumentStudio to run all tests.

  3. Some tests require simulated hardware. Copy examples\.env.simulation to the root measurement-plugin-python directory and rename it to .env to simulate the required devices.

    cp .\examples\.env.simulation .env

  4. Some DAQmx tests require persistent simulated devices created using NI MAX or the NI Hardware Configuration Utility. They require a DAQmx device that supports AI voltage measurements (e.g. PCIe-6363 or other X Series device). To simulate a DAQmx device in software: open NI MAX, right-click Devices and Interfaces, select Create New..., and select Simulated NI-DAQmx Device or Modular Instrument. For the DAQmx tests to pass, you will need two DAQmx devices named 'Dev1' and 'Dev2'.

  5. Execute the command poetry run pytest -v to run the tests, from the repo's root directory.

    (.venv) PS D:\git\measurement-plugin-python> poetry run pytest -v

Using VS Code Test Explorer extension (UI)

Install and configure the Python Test Explorer for Visual Studio Code extension to execute/debug the tests using UI. For more details related to the extension, refer here.

Generate a Code Coverage Report

  • Install the required dependency by running poetry install
  • Run the command poetry run pytest --cov=ni_measurement_plugin_sdk_service to print a test coverage summary in the console window.
  • Run the command poetry run pytest --cov-report html:cov_html --cov=ni_measurement_plugin_sdk_service to generate detailed HTML based coverage report. Upon running, the coverage reports will be created under <repo_root>\cov_html directory.

Adding Dependencies

You can add new dependencies using poetry add or by editing the pyproject.toml file.

When adding new dependencies, use a >= version constraint (instead of ^) unless the dependency uses semantic versioning.

Developer Certificate of Origin (DCO)

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I have the right to submit it under the open-source license indicated in the file; or

(b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open-source license (unless I am permitted to submit under a different license), as indicated in the file; or

(c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.

(d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.

(taken from developercertificate.org)

See LICENSE for details about how Measurement Plug-In SDK for Python is licensed.