refactor(parameters): Consistently reference env (#319)

* refactor(parameters): Contistently reference env

Use the defined constants to look up service name environment varialbe

NOTE: This does not default to `service_undefined`

* chore: bump ci

* refactor: Apply suggestions from code review

Co-authored-by: Heitor Lessa <heitor.lessa@hotmail.com>

* fix: Add missing import

* refactor: Use resolve_env_var_choice

Co-authored-by: Heitor Lessa <heitor.lessa@hotmail.com>

Author: Michael Brewer

aws_lambda_powertools/tracing/tracer.py

@@ -8,7 +8,7 @@
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 from ..shared import constants
-from ..shared.functions import resolve_truthy_env_var_choice
+from ..shared.functions import resolve_env_var_choice, resolve_truthy_env_var_choice
 from ..shared.lazy_import import LazyLoader
 from .base import BaseProvider, BaseSegment
 
@@ -720,7 +720,7 @@ def __build_config(
     ):
         """ Populates Tracer config for new and existing initializations """
         is_disabled = disabled if disabled is not None else self._is_tracer_disabled()
-        is_service = service if service is not None else os.getenv(constants.SERVICE_NAME_ENV)
+        is_service = resolve_env_var_choice(choice=service, env=os.getenv(constants.SERVICE_NAME_ENV))
 
         self._config["provider"] = provider or self._config["provider"] or aws_xray_sdk.core.xray_recorder
         self._config["auto_patch"] = auto_patch if auto_patch is not None else self._config["auto_patch"]

aws_lambda_powertools/utilities/parameters/appconfig.py

@@ -10,6 +10,8 @@
 import boto3
 from botocore.config import Config
 
+from ...shared import constants
+from ...shared.functions import resolve_env_var_choice
 from .base import DEFAULT_PROVIDERS, BaseProvider
 
 CLIENT_ID = str(uuid4())
@@ -33,6 +35,7 @@ class AppConfigProvider(BaseProvider):
     **Retrieves the latest configuration value from App Config**
 
         >>> from aws_lambda_powertools.utilities import parameters
+        >>>
         >>> appconf_provider = parameters.AppConfigProvider(environment="my_env", application="my_app")
         >>>
         >>> value : bytes = appconf_provider.get("my_conf")
@@ -66,7 +69,9 @@ def __init__(
 
         config = config or Config()
         self.client = boto3.client("appconfig", config=config)
-        self.application = application or os.getenv("POWERTOOLS_SERVICE_NAME") or "application_undefined"
+        self.application = resolve_env_var_choice(
+            choice=application, env=os.getenv(constants.SERVICE_NAME_ENV, "service_undefined")
+        )
         self.environment = environment
         self.current_version = ""
 

docs/utilities/parameters.md

@@ -407,4 +407,4 @@ Here is the mapping between this utility's functions and methods and the underly
 | Secrets Manager     | `SecretsManager.get`            | `secretsmanager` | [get_secret_value](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/secretsmanager.html#SecretsManager.Client.get_secret_value) |
 | DynamoDB            | `DynamoDBProvider.get`          | `dynamodb`       | ([Table resource](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#table)) | [get_item](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#DynamoDB.Table.get_item)
 | DynamoDB            | `DynamoDBProvider.get_multiple` | `dynamodb`       | ([Table resource](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#table)) | [query](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#DynamoDB.Table.query)
-| App Config           | `get_app_config`                 | `appconfig`       | [get_configuration](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/appconfig.html#AppConfig.Client.get_configuration) |
+| App Config          | `get_app_config`                | `appconfig`      | [get_configuration](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/appconfig.html#AppConfig.Client.get_configuration) |