feat: Add initial implementation (#1)

Author: keelerm84

.circleci/config.yml

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+version: 2.1
+
+workflows:
+  test:
+    jobs:
+      - build-run-linux:
+          context: hello-world-demos
+
+  test-daily:
+    triggers:
+    - schedule:
+        cron: "0 6 * * *"
+        filters:
+          branches:
+            only: main
+    jobs:
+    - build-run-linux:
+        context: hello-world-demos
+
+# This CI build ensures that the demo both compiles and works correctly. For the runtime test,
+# we use an SDK key and flag key that are passed in via the CircleCI project configuration;
+# the flag is configured to return a true value.
+
+jobs:
+  build-run-linux:
+    docker:
+      - image: python:3.8
+    steps:
+      - checkout
+      - run:
+          name: Install poetry
+          command: pipx install poetry
+
+      - run:
+          name: Install dependencies
+          command: poetry install
+
+      - run:
+          name: Run hello
+          command: |
+            export LAUNCHDARKLY_SERVER_SDK="${LD_HELLO_WORLD_SDK_KEY}"
+            export LAUNCHDARKLY_FLAG_KEY="${LD_HELLO_WORLD_FLAG_KEY_WITH_TRUE_VALUE}"
+            poetry run python main.py | tee output.txt
+
+      - run:
+          name: Check output
+          command: |
+            grep "is True for this context" output.txt || (echo "Flag did not evaluate to expected true value" && exit 1)

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+!.github/actions/build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+.pytest_cache
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+
+
+venv
+p2venv
+.idea
+*.iml
+.vagrant
+test-packaging-venv
+
+.vscode/
+.python-version
+
+# Poetry
+poetry.lock

README.md

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+# LaunchDarkly Sample OpenFeature Python Server application
+
+[![CircleCI](https://dl.circleci.com/status-badge/img/gh/launchdarkly/hello-openfeature-python-server/tree/main.svg?style=svg)](https://dl.circleci.com/status-badge/redirect/gh/launchdarkly/hello-openfeature-python-server/tree/main)
+
+We've built a simple console script that demonstrates how LaunchDarkly's OpenFeature provider works.
+
+## Build instructions
+
+1. Install the project dependencies by running `poetry install`
+2. Set the environment variable `LAUNCHDARKLY_SERVER_SDK` to your LaunchDarkly SDK key.
+3. Set the environment variable `LAUNCHDARKLY_FLAG_KEY` to the LaunchDarkly boolean flag key you wish to evaluate.
+4. Run `poetry run python main.py`.
+
+You should see the message `"Feature flag '<flag key>' is <True/False> for this context"`.

main.py

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+from openfeature import api
+from openfeature.evaluation_context import EvaluationContext
+from ldclient import Config
+from ld_openfeature import LaunchDarklyProvider
+from os import getenv
+
+sdk_key = getenv("LAUNCHDARKLY_SERVER_SDK", "")
+flag_key = getenv("LAUNCHDARKLY_FLAG_KEY", "")
+
+if sdk_key == "":
+    print("*** Set the 'LAUNCHDARKLY_SERVER_SDK' environment variable before running this script")
+    exit(1)
+elif flag_key == "":
+    print("*** Set the 'LAUNCHDARKLY_FLAG_KEY' environment variable before running this script")
+    exit(1)
+
+provider = LaunchDarklyProvider(Config(sdk_key))
+
+api.set_provider(provider)
+client = api.get_client()
+
+# Set up the evaluation context. This context should appear on your LaunchDarkly
+# contexts dashboard soon after you run the demo.
+context = EvaluationContext("example-user-key", {"name": "Sandy"})
+
+flag_value = client.get_boolean_value(flag_key, False, context)
+print(f"*** Feature flag '{flag_key}' is {flag_value} for this context")

pyproject.toml

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+[tool.poetry]
+name = "hello-openfeature-python-server"
+version = "0.1.0"
+description = ""
+authors = ["LaunchDarkly <[email protected]>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.8"
+launchdarkly-openfeature-server = "^0.1.0"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"