Feature/env propagator

[Div95]

Description

Extended opentelemetry-python to develop a propagator that helps in inter-process propagation of trace/baggage details in a particular format (b3/w3c/any other) using environment dictionary as the carrier.

Using environment dictionary as the carrier will help to connect batch processes. For example: The environment dictionary containing trace/baggage details can be passed to the next process in the subprocess call, thereby propagating the trace/baggage details across processes.

The propagator has dependency on opentelemetry-api.

Relates to opentelemetry-specification issue #740

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

All the functions in the propagator have been tested using unittest library.

Following steps can be followed to run the tests:

1. cd opentelemetry-python/propagator/opentelemetry-propagator-env
2. Run the command to install the propagator in editable mode: pip install -e .[test] For z-shell, use the command: pip install -e ".[test]"
3. Run the tests: python3 -m unittest Then you can uninstall the project by using the command: pip uninstall opentelemetry-propagator-env you could also run individual test files by using the command format: python3 -m unittest tests.<test_file_name>.<test_file_class>

Does This PR Require a Contrib Repo Change?

Answer the following question based on these examples of changes that would require a Contrib Repo Change:

• The OTel specification has changed which prompted this PR to update the method interfaces of opentelemetry-api/ or opentelemetry-sdk/

• The method interfaces of opentelemetry-instrumentation/ have changed

• The method interfaces of test/util have changed

• Scripts in scripts/ that were copied over to the Contrib repo have changed

• Configuration files that were copied over to the Contrib repo have changed (when consistency between repositories is applicable) such as in

  • pyproject.toml
  • isort.cfg
  • .flake8

• When a new .github/CODEOWNER is added

• Major changes to project information, such as in:

  • README.md
  • CONTRIBUTING.md

• [ ] Yes. - Link to PR:

• [x] No.

Checklist:

• [x] Followed the style guidelines of this project
• [ ] Changelogs have been updated
• [x] Unit tests have been added
• [ ] Documentation has been updated