feat(provider): add Unleash provider

.github/workflows/build.yml

@@ -48,6 +48,9 @@ jobs:
             providers/openfeature-provider-ofrep:
               - 'providers/openfeature-provider-ofrep/**'
               - 'uv.lock'
+            providers/openfeature-provider-unleash:
+              - 'providers/openfeature-provider-unleash/**'
+              - 'uv.lock'
 
   build:
     needs: changes

.release-please-manifest.json

@@ -3,5 +3,6 @@
   "providers/openfeature-provider-flagd": "0.2.6",
   "providers/openfeature-provider-ofrep": "0.2.0",
   "providers/openfeature-provider-flipt": "0.1.3",
-  "providers/openfeature-provider-env-var": "0.1.0"
+  "providers/openfeature-provider-env-var": "0.1.0",
+  "providers/openfeature-provider-unleash": "0.1.0"
 }

providers/openfeature-provider-unleash/LICENSE

@@ -0,0 +1,201 @@
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providers/openfeature-provider-unleash/README.md

@@ -0,0 +1,163 @@
+# Unleash Provider for OpenFeature
+
+This provider is designed to use [Unleash](https://www.getunleash.io/).
+
+## Installation
+
+```
+pip install openfeature-provider-unleash
+```
+
+### Requirements
+
+- Python 3.9+
+- `openfeature-sdk>=0.8.2`
+- `UnleashClient>=6.3.0`
+
+## Configuration and Usage
+
+Instantiate a new UnleashProvider instance and configure the OpenFeature SDK to use it:
+
+```python
+from openfeature import api
+from openfeature.contrib.provider.unleash import UnleashProvider
+
+# Initialize the provider with your Unleash configuration
+provider = UnleashProvider(
+    url="https://my-unleash-instance.com",
+    app_name="my-python-app",
+    api_token="my-api-token",
+)
+
+# Initialize the provider (required before use)
+provider.initialize()
+
+api.set_provider(provider)
+```
+
+### Configuration options
+
+- `url`: The URL of your Unleash server
+- `app_name`: The name of your application
+- `api_token`: The API token for authentication
+
+### Evaluation context mapping
+
+When evaluating flags, the OpenFeature `EvaluationContext` is mapped to the Unleash context as follows:
+
+- `EvaluationContext.targeting_key` → Unleash `userId`
+- `EvaluationContext.attributes` → merged into the Unleash context as-is
+
+### Event handling
+
+The Unleash provider supports OpenFeature events for monitoring provider state changes:
+
+```python
+from openfeature.event import ProviderEvent
+
+def on_provider_ready(event_details):
+    print(f"Provider {event_details['provider_name']} is ready")
+
+def on_provider_error(event_details):
+    print(f"Provider error: {event_details['error_message']}")
+
+def on_configuration_changed(event_details):
+    print(f"Configuration changed, flags: {event_details.get('flag_keys', [])}")
+
+# Add event handlers
+provider.add_handler(ProviderEvent.PROVIDER_READY, on_provider_ready)
+provider.add_handler(ProviderEvent.PROVIDER_ERROR, on_provider_error)
+provider.add_handler(
+    ProviderEvent.PROVIDER_CONFIGURATION_CHANGED, on_configuration_changed
+)
+
+# Remove event handlers
+provider.remove_handler(ProviderEvent.PROVIDER_READY, on_provider_ready)
+```
+
+**Supported events:**
+- `ProviderEvent.PROVIDER_READY`: Emitted when the provider is ready to evaluate flags
+- `ProviderEvent.PROVIDER_ERROR`: Emitted when the provider encounters an error
+- `ProviderEvent.PROVIDER_CONFIGURATION_CHANGED`: Emitted when flag configurations are updated
+
+Note: `ProviderEvent.PROVIDER_STALE` handlers can be registered but are not currently emitted by this provider.
+
+### Supported flag types
+
+This provider supports resolving the following types via the OpenFeature client:
+
+- Boolean (`get_boolean_value`/`details`): uses `UnleashClient.is_enabled`
+- String (`get_string_value`/`details`): from variant payload
+- Integer (`get_integer_value`/`details`): from variant payload
+- Float (`get_float_value`/`details`): from variant payload
+- Object (`get_object_value`/`details`): from variant payload, JSON-parsed if needed
+
+### Example usage
+
+```python
+from openfeature import api
+from openfeature.contrib.provider.unleash import UnleashProvider
+from openfeature.evaluation_context import EvaluationContext
+
+# Initialize the provider
+provider = UnleashProvider(
+    url="https://your-unleash-instance.com",
+    app_name="my-python-app",
+    api_token="my-token"
+)
+provider.initialize()
+api.set_provider(provider)
+
+# Get a client and evaluate flags
+client = api.get_client()
+
+# Boolean flag evaluation
+is_enabled = client.get_boolean_value("my-feature", False)
+print(f"Feature is enabled: {is_enabled}")
+
+# String flag evaluation with context
+context = EvaluationContext(targeting_key="user123", attributes={"sessionId": "session456"})
+variant = client.get_string_value("my-variant-flag", "default", context)
+print(f"Variant: {variant}")
+
+# Shutdown when done
+provider.shutdown()
+```
+
+## Development
+
+### Running tests
+
+```bash
+uv run test --frozen
+```
+
+Integration tests require Docker to be installed and running. To run only integration tests:
+
+```bash
+uv run test -m integration --frozen
+```
+
+To skip integration tests:
+
+```bash
+uv run test -m "not integration" --frozen
+```
+
+### Type checking
+
+```bash
+uv run mypy-check
+```
+
+### Linting
+
+Run Ruff checks:
+
+```bash
+uv run ruff check
+```
+
+## License
+
+Apache 2.0 - See [LICENSE](./LICENSE) for more information.