python-sdk: Work in progress initial commit of a python sdk

.gitignore

@@ -11,7 +11,6 @@ build/
 develop-eggs/
 dist/
 eggs/
-lib/
 lib64/
 parts/
 sdist/
@@ -38,6 +37,7 @@ coverage.xml
 .mr.developer.cfg
 .project
 .pydevproject
+.idea
 
 # Rope
 .ropeproject

LICENSE

@@ -0,0 +1,201 @@
+Apache License
+                           Version 2.0, January 2004
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+
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requirements-dev.in

@@ -0,0 +1,11 @@
+pylint
+pep8
+autopep8
+pytest
+pytest-mock
+black
+pip-tools
+responses
+pre-commit
+flake8
+pytest-mock

requirements-dev.txt

@@ -0,0 +1,124 @@
+#
+# This file is autogenerated by pip-compile with python 3.9
+# To update, run:
+#
+#    pip-compile requirements-dev.in
+#
+astroid==2.11.5
+    # via pylint
+attrs==21.4.0
+    # via pytest
+autopep8==1.6.0
+    # via -r requirements-dev.in
+black==22.3.0
+    # via -r requirements-dev.in
+certifi==2021.10.8
+    # via requests
+cfgv==3.3.1
+    # via pre-commit
+charset-normalizer==2.0.12
+    # via requests
+click==8.1.3
+    # via
+    #   black
+    #   pip-tools
+dill==0.3.4
+    # via pylint
+distlib==0.3.4
+    # via virtualenv
+filelock==3.6.0
+    # via virtualenv
+flake8==4.0.1
+    # via -r requirements-dev.in
+identify==2.5.0
+    # via pre-commit
+idna==3.3
+    # via requests
+iniconfig==1.1.1
+    # via pytest
+isort==5.10.1
+    # via pylint
+lazy-object-proxy==1.7.1
+    # via astroid
+mccabe==0.6.1
+    # via
+    #   flake8
+    #   pylint
+mypy-extensions==0.4.3
+    # via black
+nodeenv==1.6.0
+    # via pre-commit
+packaging==21.3
+    # via pytest
+pathspec==0.9.0
+    # via black
+pep517==0.12.0
+    # via pip-tools
+pep8==1.7.1
+    # via -r requirements-dev.in
+pip-tools==6.6.0
+    # via -r requirements-dev.in
+platformdirs==2.5.2
+    # via
+    #   black
+    #   pylint
+    #   virtualenv
+pluggy==1.0.0
+    # via pytest
+pre-commit==2.19.0
+    # via -r requirements-dev.in
+py==1.11.0
+    # via pytest
+pycodestyle==2.8.0
+    # via
+    #   autopep8
+    #   flake8
+pyflakes==2.4.0
+    # via flake8
+pylint==2.13.8
+    # via -r requirements-dev.in
+pyparsing==3.0.9
+    # via packaging
+pytest==7.1.2
+    # via
+    #   -r requirements-dev.in
+    #   pytest-mock
+pytest-mock==3.7.0
+    # via -r requirements-dev.in
+pyyaml==6.0
+    # via pre-commit
+requests==2.27.1
+    # via responses
+responses==0.20.0
+    # via -r requirements-dev.in
+six==1.16.0
+    # via virtualenv
+toml==0.10.2
+    # via
+    #   autopep8
+    #   pre-commit
+tomli==2.0.1
+    # via
+    #   black
+    #   pep517
+    #   pylint
+    #   pytest
+typing-extensions==4.2.0
+    # via
+    #   astroid
+    #   black
+    #   pylint
+urllib3==1.26.9
+    # via
+    #   requests
+    #   responses
+virtualenv==20.14.1
+    # via pre-commit
+wheel==0.37.1
+    # via pip-tools
+wrapt==1.14.1
+    # via astroid
+
+# The following packages are considered to be unsafe in a requirements file:
+# pip
+# setuptools

requirements.in

@@ -0,0 +1 @@
+flagsmith

requirements.txt

@@ -0,0 +1,18 @@
+#
+# This file is autogenerated by pip-compile with python 3.9
+# To update, run:
+#
+#    pip-compile
+#
+certifi==2021.10.8
+    # via requests
+charset-normalizer==2.0.12
+    # via requests
+flagsmith==2.0.1
+    # via -r requirements.in
+idna==3.3
+    # via requests
+requests==2.27.1
+    # via flagsmith
+urllib3==1.26.9
+    # via requests

src/client.py

@@ -0,0 +1,383 @@
+from enum import Enum
+from numbers import Number
+
+from src.provider.provider import AbstractProvider
+from open_feature import OpenFeatureProvider, OpenFeature
+
+
+class FlagType(Enum):
+    BOOLEAN = 1
+    STRING = 2
+    NUMBER = 3
+
+
+class OpenFeatureClient:
+    def __init__(self, name: str, version: str, context: Context, hooks: list = []):
+        self.name = name
+        self.version = version
+        self.context = context
+        self.hooks = hooks
+
+    def get_boolean_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> bool:
+        return self.evaluate_flag(
+            FlagType.BOOLEAN,
+            key,
+            defaultValue,
+            evaluationContext,
+            flagEvaluationOptions,
+        )
+
+    def get_boolean_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        return self.get_boolean_details(
+            key, defaultValue, evaluationContext, flagEvaluationOptions
+        )
+
+    def get_string_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> str:
+        return self.evaluate_flag(
+            FlagType.BOOLEAN,
+            key,
+            defaultValue,
+            evaluationContext,
+            flagEvaluationOptions,
+        )
+
+    def get_string_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        return self.get_string_details(
+            key, defaultValue, evaluationContext, flagEvaluationOptions
+        )
+
+    def get_number_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> Number:
+        return self.evaluate_flag(
+            FlagType.BOOLEAN,
+            key,
+            defaultValue,
+            evaluationContext,
+            flagEvaluationOptions,
+        )
+
+    def get_number_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        return self.get_number_details(
+            key, defaultValue, evaluationContext, flagEvaluationOptions
+        )
+
+    def evaluate_flag(
+        self,
+        flag_type: FlagType,
+        key: str,
+        defaultValue: bool,
+        evaluationContext,
+        flagEvaluationOptions,
+    ):
+        provider = OpenFeature.get_provider()
+        if flag_type is FlagType.BOOLEAN:
+            return provider.getBooleanEvaluation(
+                key, defaultValue, evaluationContext, flagEvaluationOptions
+            )
+        if flag_type is FlagType.NUMBER:
+            return provider.getNumberEvaluation(
+                key, defaultValue, evaluationContext, flagEvaluationOptions
+            )
+        if flag_type is FlagType.STRING:
+            return provider.getStringEvaluation(
+                key, defaultValue, evaluationContext, flagEvaluationOptions
+            )
+
+
+#   async getBooleanValue(
+#     flagKey: string,
+#     defaultValue: boolean,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<boolean> {
+#     return (
+#       await this.getBooleanDetails(flagKey, defaultValue, context, options)
+#     ).value;
+#   }
+#
+#   getBooleanDetails(
+#     flagKey: string,
+#     defaultValue: boolean,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<FlagEvaluationDetails<boolean>> {
+#     return this.evaluateFlag(
+#       'boolean',
+#       flagKey,
+#       defaultValue,
+#       context,
+#       options
+#     );
+#   }
+#
+#   async getStringValue(
+#     flagKey: string,
+#     defaultValue: string,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<string> {
+#     return (
+#       await this.getStringDetails(flagKey, defaultValue, context, options)
+#     ).value;
+#   }
+#
+#   getStringDetails(
+#     flagKey: string,
+#     defaultValue: string,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<FlagEvaluationDetails<string>> {
+#     return this.evaluateFlag('string', flagKey, defaultValue, context, options);
+#   }
+#
+#   async getNumberValue(
+#     flagKey: string,
+#     defaultValue: number,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<number> {
+#     return (
+#       await this.getNumberDetails(flagKey, defaultValue, context, options)
+#     ).value;
+#   }
+#
+#   getNumberDetails(
+#     flagKey: string,
+#     defaultValue: number,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<FlagEvaluationDetails<number>> {
+#     return this.evaluateFlag('number', flagKey, defaultValue, context, options);
+#   }
+#
+#   async getObjectValue<T extends object>(
+#     flagKey: string,
+#     defaultValue: T,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<T> {
+#     return (
+#       await this.getObjectDetails(flagKey, defaultValue, context, options)
+#     ).value;
+#   }
+#
+#   getObjectDetails<T extends object>(
+#     flagKey: string,
+#     defaultValue: T,
+#     context?: Context,
+#     options?: FlagEvaluationOptions
+#   ): Promise<FlagEvaluationDetails<T>> {
+#     return this.evaluateFlag('json', flagKey, defaultValue, context, options);
+#   }
+#
+#   private async evaluateFlag<T extends FlagValue>(
+#     flagValueType: FlagValueType,
+#     flagKey: string,
+#     defaultValue: T,
+#     context: Context | undefined,
+#     options?: FlagEvaluationOptions
+#   ): Promise<FlagEvaluationDetails<T>> {
+#     const provider = this.getProvider();
+#     const flagHooks = options?.hooks ?? [];
+#     const allHooks: Hook<FlagValue>[] = [
+#       ...OpenFeatureAPI.getInstance().hooks,
+#       ...this.hooks,
+#       ...flagHooks,
+#     ];
+#     // merge client context with evaluation context
+#     const mergedContext = {
+#       ...this.context,
+#       ...this.getTransactionContext(),
+#       ...context,
+#     };
+#
+#     // this object reference must not change over the course of flag evaluation
+#     const hookContext: HookContext = {
+#       flagKey,
+#       flagValueType,
+#       defaultValue,
+#       context: mergedContext,
+#       client: this,
+#       provider,
+#       executedHooks: {
+#         after: [],
+#         before: [],
+#         error: [],
+#         finally: [],
+#       },
+#     };
+#     let evaluationDetailsPromise: Promise<ProviderEvaluation<FlagValue>>;
+#
+#     try {
+#       this.beforeEvaluation(allHooks, hookContext);
+#
+#       // if a transformer is defined, run it to prepare the context.
+#       const transformedContext =
+#         typeof provider.contextTransformer === 'function'
+#           ? await provider.contextTransformer(mergedContext)
+#           : mergedContext;
+#       switch (flagValueType) {
+#         case 'boolean': {
+#           evaluationDetailsPromise = provider.getBooleanEvaluation(
+#             flagKey,
+#             defaultValue as boolean,
+#             transformedContext,
+#             options
+#           );
+#           break;
+#         }
+#         case 'string': {
+#           evaluationDetailsPromise = provider.getStringEvaluation(
+#             flagKey,
+#             defaultValue as string,
+#             transformedContext,
+#             options
+#           );
+#           break;
+#         }
+#         case 'number': {
+#           evaluationDetailsPromise = provider.getNumberEvaluation(
+#             flagKey,
+#             defaultValue as number,
+#             transformedContext,
+#             options
+#           );
+#           break;
+#         }
+#         case 'json': {
+#           evaluationDetailsPromise = provider.getObjectEvaluation(
+#             flagKey,
+#             defaultValue as object,
+#             transformedContext,
+#             options
+#           );
+#           break;
+#         }
+#         default: {
+#           throw new GeneralError('Unknown flag type');
+#         }
+#       }
+#
+#       const evaluationDetails = await evaluationDetailsPromise;
+#       return {
+#         ...evaluationDetails,
+#         value: this.afterEvaluation(
+#           allHooks,
+#           hookContext,
+#           evaluationDetails
+#         ) as T,
+#         flagKey,
+#         executedHooks: hookContext.executedHooks,
+#       };
+#     } catch (err) {
+#       if (this.isError(err)) {
+#         this.errorEvaluation(allHooks, hookContext, err);
+#       }
+#       return {
+#         flagKey,
+#         executedHooks: hookContext.executedHooks,
+#         value: defaultValue,
+#         reason: Reason.ERROR,
+#       };
+#     } finally {
+#       this.finallyEvaluation(allHooks, hookContext);
+#     }
+#   }
+#
+#   getTransactionContext(): Context {
+#     return openfeature.getTransactionContext();
+#   }
+#
+#   private beforeEvaluation(allHooks: Hook[], hookContext: HookContext) {
+#     const mergedContext = allHooks.reduce(
+#       (accumulated: Context, hook: Hook): Context => {
+#         if (typeof hook?.before === 'function') {
+#           hookContext.executedHooks.before.push(hook.name);
+#           return {
+#             ...accumulated,
+#             ...hook.before(hookContext),
+#           };
+#         }
+#         return accumulated;
+#       },
+#       hookContext.context
+#     );
+#     hookContext.context = mergedContext;
+#   }
+#
+#   private afterEvaluation(
+#     allHooks: Hook[],
+#     hookContext: HookContext,
+#     evaluationDetails: ProviderEvaluation<FlagValue>
+#   ): FlagValue {
+#     return allHooks.reduce((accumulated: FlagValue, hook) => {
+#       if (typeof hook?.after === 'function') {
+#         hookContext.executedHooks.after.push(hook.name);
+#         return (
+#           hook.after(hookContext, {
+#             ...evaluationDetails,
+#             flagKey: hookContext.flagKey,
+#             executedHooks: hookContext.executedHooks,
+#           }) ?? accumulated
+#         );
+#       }
+#       return accumulated;
+#     }, evaluationDetails.value);
+#   }
+#
+#   private finallyEvaluation(allHooks: Hook[], hookContext: HookContext): void {
+#     allHooks.forEach((hook) => {
+#       if (typeof hook?.finally === 'function') {
+#         hookContext.executedHooks.finally.push(hook.name);
+#         return hook.finally(hookContext);
+#       }
+#     });
+#   }
+#
+#   private errorEvaluation(
+#     allHooks: Hook[],
+#     hookContext: HookContext,
+#     err: Error
+#   ): void {
+#     // Workaround for error scoping issue
+#     const error = err;
+#     allHooks.forEach((hook) => {
+#       if (typeof hook?.error === 'function') {
+#         hookContext.executedHooks.error.push(hook.name);
+#         return hook.error(hookContext, error);
+#       }
+#     });
+#   }
+#
+#   private getAllHooks(options: FlagEvaluationOptions | undefined) {
+#     const flagHooks = options?.hooks ?? [];
+#     const allHooks: Hook<FlagValue>[] = [
+#       ...OpenFeatureAPI.getInstance().hooks,
+#       ...this.hooks,
+#       ...flagHooks,
+#     ];
+#     return allHooks;
+#   }
+#
+#   private getProvider(): FeatureProvider<unknown> {
+#     return (this.api.getProvider() ??
+#       NOOP_FEATURE_PROVIDER) as FeatureProvider<unknown>;
+#   }
+#
+#   private isError(err: unknown): err is Error {
+#     return (
+#       (err as Error).stack !== undefined && (err as Error).message !== undefined
+#     );
+#   }
+# }

src/open_feature.py

@@ -0,0 +1,20 @@
+from src.provider.provider import AbstractProvider
+
+global provider
+
+
+class OpenFeature:
+    def __init__(self):
+        pass
+
+    @staticmethod
+    def set_provider(provider_type: AbstractProvider):
+        if provider_type is None:
+            print("No provider")
+        global provider
+        provider = provider_type
+
+    @staticmethod
+    def get_provider() -> AbstractProvider:
+        global provider
+        return provider

src/provider/flagsmith/flagsmith_provider.py

@@ -0,0 +1,31 @@
+from numbers import Number
+
+import flagsmith as Flagsmith
+
+from src.provider.provider import AbstractProvider
+
+
+class FlagsmithProvider(AbstractProvider):
+    def __init__(self, flagsmith: Flagsmith = None):
+        if flagsmith is None:
+            self.flagsmith_provider = Flagsmith(environment_id="<YOUR_ENVIRONMENT_KEY>")
+        else:
+            self.flagsmith_provider = flagsmith
+
+    def get_boolean_value(self, key: str, defaultValue: bool) -> bool:
+        value = self.flagsmith_provider.get_value(key)
+
+    def get_boolean_details(self, key: str, defaultValue: bool):
+        pass
+
+    def get_string_value(self, key: str, defaultValue: bool) -> str:
+        value = self.flagsmith_provider.get_value(key)
+
+    def get_string_details(self, key: str, defaultValue: bool):
+        pass
+
+    def get_number_value(self, key: str, defaultValue: bool) -> Number:
+        value = self.flagsmith_provider.get_value(key)
+
+    def get_number_details(self, key: str, defaultValue: bool):
+        pass

src/provider/provider.py

@@ -0,0 +1,92 @@
+from abc import abstractmethod
+from numbers import Number
+
+
+class AbstractProvider:
+    @abstractmethod
+    def get_boolean_value(self, key: str, defaultValue: bool) -> bool:
+        pass
+
+    @abstractmethod
+    def get_boolean_value(
+        self, key: str, defaultValue: bool, evaluationContext
+    ) -> bool:
+        pass
+
+    @abstractmethod
+    def get_boolean_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> bool:
+        pass
+
+    @abstractmethod
+    def get_boolean_details(self, key: str, defaultValue: bool):
+        pass
+
+    @abstractmethod
+    def get_boolean_details(self, key: str, defaultValue: bool, evaluationContext):
+        pass
+
+    @abstractmethod
+    def get_boolean_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        pass
+
+    @abstractmethod
+    def get_string_value(self, key: str, defaultValue: bool) -> str:
+        pass
+
+    @abstractmethod
+    def get_string_value(self, key: str, defaultValue: bool, evaluationContext) -> str:
+        pass
+
+    @abstractmethod
+    def get_string_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> str:
+        pass
+
+    @abstractmethod
+    def get_string_details(self, key: str, defaultValue: bool):
+        pass
+
+    @abstractmethod
+    def get_string_details(self, key: str, defaultValue: bool, evaluationContext):
+        pass
+
+    @abstractmethod
+    def get_string_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        pass
+
+    @abstractmethod
+    def get_number_value(self, key: str, defaultValue: bool) -> Number:
+        pass
+
+    @abstractmethod
+    def get_number_value(
+        self, key: str, defaultValue: bool, evaluationContext
+    ) -> Number:
+        pass
+
+    @abstractmethod
+    def get_number_value(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ) -> Number:
+        pass
+
+    @abstractmethod
+    def get_number_details(self, key: str, defaultValue: bool):
+        pass
+
+    @abstractmethod
+    def get_number_details(self, key: str, defaultValue: bool, evaluationContext):
+        pass
+
+    @abstractmethod
+    def get_number_details(
+        self, key: str, defaultValue: bool, evaluationContext, flagEvaluationOptions
+    ):
+        pass

tests/provider/flagsmith/test_flagsmith_provider.py

@@ -0,0 +1,19 @@
+from unittest.mock import Mock
+
+from src.open_feature import OpenFeatureProvider
+from src.provider.flagsmith.flagsmith_provider import FlagsmithProvider
+
+
+def setUp():
+    OpenFeatureProvider.set_provider(FlagsmithProvider(flagsmith=Mock()))
+    provider = OpenFeatureProvider.get_provider()
+    assert isinstance(provider, FlagsmithProvider)
+
+
+def test_should_get_boolean_flag_from_flagsmith():
+    # Given
+    provider = OpenFeatureProvider.get_provider()
+    # When
+    flag = provider.get_boolean_value("Key", False)
+    # Then
+    assert flag