fix(parameters): key appconfig default provider by environment and ap…

aws_lambda_powertools/utilities/parameters/appconfig.py

@@ -214,11 +214,12 @@ def get_app_config(
     # If max_age is not set, resolve it from the environment variable, defaulting to DEFAULT_MAX_AGE_SECS
     max_age = resolve_max_age(env=os.getenv(constants.PARAMETERS_MAX_AGE_ENV, DEFAULT_MAX_AGE_SECS), choice=max_age)
 
-    # Only create the provider if this function is called at least once
-    if "appconfig" not in DEFAULT_PROVIDERS:
-        DEFAULT_PROVIDERS["appconfig"] = AppConfigProvider(environment=environment, application=application)
+    # One provider per environment/application pair, created on first use
+    provider_key = f"appconfig:{environment}:{application}"
+    if provider_key not in DEFAULT_PROVIDERS:
+        DEFAULT_PROVIDERS[provider_key] = AppConfigProvider(environment=environment, application=application)
 
-    return DEFAULT_PROVIDERS["appconfig"].get(
+    return DEFAULT_PROVIDERS[provider_key].get(
         name,
         max_age=max_age,
         transform=transform,

tests/functional/parameters/_boto3/test_utilities_parameters.py

@@ -1033,7 +1033,7 @@ def _get_multiple(self, path: str, **kwargs) -> dict[str, str]: ...
 
     monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "ssm", TestProvider())
     monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "secrets", TestProvider())
-    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig", TestProvider())
+    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig:test:test", TestProvider())
 
     parameters.get_parameter(mock_name)
     parameters.get_secret(mock_name)
@@ -3103,7 +3103,7 @@ def _get(self, name: str, **kwargs) -> bytes:
         def _get_multiple(self, path: str, **kwargs) -> dict[str, str]:
             raise NotImplementedError()
 
-    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig", TestProvider())
+    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig:dev:myapp", TestProvider())
 
     environment = "dev"
     application = "myapp"
@@ -3128,7 +3128,7 @@ def _get(self, name: str, **kwargs) -> str:
         def _get_multiple(self, path: str, **kwargs) -> dict[str, str]:
             raise NotImplementedError()
 
-    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig", TestProvider())
+    monkeypatch.setitem(parameters.base.DEFAULT_PROVIDERS, "appconfig:dev:myapp", TestProvider())
 
     environment = "dev"
     application = "myapp"
@@ -3158,10 +3158,36 @@ def _get_multiple(self, path: str, **kwargs) -> dict[str, str]:
     value = parameters.get_app_config(mock_name, environment="dev", application="myapp")
 
     # THEN
-    assert parameters.appconfig.DEFAULT_PROVIDERS["appconfig"] is not None
+    assert parameters.appconfig.DEFAULT_PROVIDERS["appconfig:dev:myapp"] is not None
     assert value == mock_value
 
 
+def test_appconf_get_app_config_different_environment_and_application(monkeypatch, mock_name):
+    # GIVEN a provider that reports which environment/application it was built for
+    class TestProvider(BaseProvider):
+        def __init__(self, environment: str, application: str):
+            super().__init__()
+            self.environment = environment
+            self.application = application
+
+        def _get(self, name: str, **kwargs) -> str:
+            return f"{self.application}/{self.environment}"
+
+        def _get_multiple(self, path: str, **kwargs) -> dict[str, str]:
+            raise NotImplementedError()
+
+    monkeypatch.setattr(parameters.appconfig, "DEFAULT_PROVIDERS", {})
+    monkeypatch.setattr(parameters.appconfig, "AppConfigProvider", TestProvider)
+
+    # WHEN get_app_config is called with different applications and environments
+    first = parameters.get_app_config(mock_name, environment="dev", application="app-a", max_age=0)
+    second = parameters.get_app_config(mock_name, environment="prod", application="app-b", max_age=0)
+
+    # THEN each call uses its own environment and application
+    assert first == "app-a/dev"
+    assert second == "app-b/prod"
+
+
 def test_transform_value_auto(mock_value: str):
     # GIVEN
     json_data = json.dumps({"A": mock_value})