refactor(typing): enable boto3 implicit type annotations

aws_lambda_powertools/utilities/data_classes/s3_object_event.py

@@ -220,7 +220,7 @@ class S3ObjectLambdaEvent(DictWrapper):
         import requests
         from aws_lambda_powertools.utilities.data_classes.s3_object_event import S3ObjectLambdaEvent
 
-        session = boto3.Session()
+        session = boto3.session.Session()
         s3 = session.client("s3")
 
         def lambda_handler(event, context):

aws_lambda_powertools/utilities/idempotency/persistence/dynamodb.py

@@ -23,7 +23,7 @@
 )
 
 if TYPE_CHECKING:
-    from mypy_boto3_dynamodb import DynamoDBClient
+    from mypy_boto3_dynamodb.client import DynamoDBClient
     from mypy_boto3_dynamodb.type_defs import AttributeValueTypeDef
 
 logger = logging.getLogger(__name__)
@@ -43,7 +43,7 @@ def __init__(
         validation_key_attr: str = "validation",
         boto_config: Optional[Config] = None,
         boto3_session: Optional[boto3.session.Session] = None,
-        boto3_client: "DynamoDBClient" | None = None,
+        boto3_client: Optional[DynamoDBClient] = None,
     ):
         """
         Initialize the DynamoDB client
@@ -71,7 +71,7 @@ def __init__(
             DynamoDB attribute name for hashed representation of the parts of the event used for validation
         boto_config: botocore.config.Config, optional
             Botocore configuration to pass during client initialization
-        boto3_session : boto3.Session, optional
+        boto3_session : boto3.session.Session, optional
             Boto3 session to use for AWS API communication
         boto3_client : DynamoDBClient, optional
             Boto3 DynamoDB Client to use, boto3_session and boto_config will be ignored if both are provided
@@ -91,11 +91,9 @@ def __init__(
             >>>     return {"StatusCode": 200}
         """
         if boto3_client is None:
-            self._boto_config = boto_config or Config()
-            self._boto3_session: boto3.Session = boto3_session or boto3.session.Session()
-            self.client: "DynamoDBClient" = self._boto3_session.client("dynamodb", config=self._boto_config)
-        else:
-            self.client = boto3_client
+            boto3_session = boto3_session or boto3.session.Session()
+            boto3_client = boto3_session.client("dynamodb", config=boto_config)
+        self.client = boto3_client
 
         user_agent.register_feature_to_client(client=self.client, feature="idempotency")
 
@@ -246,13 +244,20 @@ def _put_record(self, data_record: DataRecord) -> None:
                     ":now_in_millis": {"N": str(int(now.timestamp() * 1000))},
                     ":inprogress": {"S": STATUS_CONSTANTS["INPROGRESS"]},
                 },
-                **self.return_value_on_condition,  # type: ignore
+                **self.return_value_on_condition,  # type: ignore[arg-type]
             )
         except ClientError as exc:
             error_code = exc.response.get("Error", {}).get("Code")
             if error_code == "ConditionalCheckFailedException":
-                old_data_record = self._item_to_data_record(exc.response["Item"]) if "Item" in exc.response else None
-                if old_data_record is not None:
+                try:
+                    item = exc.response["Item"]  # type: ignore[typeddict-item]
+                except KeyError:
+                    logger.debug(
+                        f"Failed to put record for already existing idempotency key: {data_record.idempotency_key}",
+                    )
+                    raise IdempotencyItemAlreadyExistsError() from exc
+                else:
+                    old_data_record = self._item_to_data_record(item)
                     logger.debug(
                         f"Failed to put record for already existing idempotency key: "
                         f"{data_record.idempotency_key} with status: {old_data_record.status}, "
@@ -268,11 +273,6 @@ def _put_record(self, data_record: DataRecord) -> None:
 
                     raise IdempotencyItemAlreadyExistsError(old_data_record=old_data_record) from exc
 
-                logger.debug(
-                    f"Failed to put record for already existing idempotency key: {data_record.idempotency_key}",
-                )
-                raise IdempotencyItemAlreadyExistsError() from exc
-
             raise
 
     @staticmethod
@@ -297,7 +297,7 @@ def boto3_supports_condition_check_failure(boto3_version: str) -> bool:
     def _update_record(self, data_record: DataRecord):
         logger.debug(f"Updating record for idempotency key: {data_record.idempotency_key}")
         update_expression = "SET #response_data = :response_data, #expiry = :expiry, #status = :status"
-        expression_attr_values: Dict[str, "AttributeValueTypeDef"] = {
+        expression_attr_values: Dict[str, AttributeValueTypeDef] = {
             ":expiry": {"N": str(data_record.expiry_timestamp)},
             ":response_data": {"S": data_record.response_data},
             ":status": {"S": data_record.status},

aws_lambda_powertools/utilities/parameters/appconfig.py

@@ -3,15 +3,15 @@
 """
 
 import os
-from typing import TYPE_CHECKING, Any, Dict, Optional, Union
+from typing import TYPE_CHECKING, Dict, Optional, Union
 
 import boto3
 from botocore.config import Config
 
 from aws_lambda_powertools.utilities.parameters.types import TransformOptions
 
 if TYPE_CHECKING:
-    from mypy_boto3_appconfigdata import AppConfigDataClient
+    from mypy_boto3_appconfigdata.client import AppConfigDataClient
 
 from aws_lambda_powertools.shared import constants
 from aws_lambda_powertools.shared.functions import (
@@ -67,8 +67,6 @@ class AppConfigProvider(BaseProvider):
 
     """
 
-    client: Any = None
-
     def __init__(
         self,
         environment: str,
@@ -80,15 +78,10 @@ def __init__(
         """
         Initialize the App Config client
         """
-
-        super().__init__()
-
-        self.client: "AppConfigDataClient" = self._build_boto3_client(
-            service_name="appconfigdata",
-            client=boto3_client,
-            session=boto3_session,
-            config=config,
-        )
+        if boto3_client is None:
+            boto3_session = boto3_session or boto3.session.Session()
+            boto3_client = boto3_session.client("appconfigdata", config=config)
+        self.client = boto3_client
 
         self.application = resolve_env_var_choice(
             choice=application,
@@ -99,9 +92,11 @@ def __init__(
 
         self._next_token: Dict[str, str] = {}  # nosec - token for get_latest_configuration executions
         # Dict to store the recently retrieved value for a specific configuration.
-        self.last_returned_value: Dict[str, str] = {}
+        self.last_returned_value: Dict[str, bytes] = {}
+
+        super().__init__(client=self.client)
 
-    def _get(self, name: str, **sdk_options) -> str:
+    def _get(self, name: str, **sdk_options) -> bytes:
         """
         Retrieve a parameter value from AWS App config.
 

aws_lambda_powertools/utilities/parameters/base.py

@@ -10,43 +10,30 @@
 from abc import ABC, abstractmethod
 from datetime import datetime, timedelta
 from typing import (
-    TYPE_CHECKING,
     Any,
     Callable,
     Dict,
     NamedTuple,
     Optional,
     Tuple,
-    Type,
     Union,
     cast,
     overload,
 )
 
-import boto3
-from botocore.config import Config
-
 from aws_lambda_powertools.shared import constants, user_agent
 from aws_lambda_powertools.shared.functions import resolve_max_age
 from aws_lambda_powertools.utilities.parameters.types import TransformOptions
 
 from .exceptions import GetParameterError, TransformParameterError
 
-if TYPE_CHECKING:
-    from mypy_boto3_appconfigdata import AppConfigDataClient
-    from mypy_boto3_dynamodb import DynamoDBServiceResource
-    from mypy_boto3_secretsmanager import SecretsManagerClient
-    from mypy_boto3_ssm import SSMClient
-
-
 DEFAULT_MAX_AGE_SECS = "300"
 
 # These providers will be dynamically initialized on first use of the helper functions
 DEFAULT_PROVIDERS: Dict[str, Any] = {}
 TRANSFORM_METHOD_JSON = "json"
 TRANSFORM_METHOD_BINARY = "binary"
 SUPPORTED_TRANSFORM_METHODS = [TRANSFORM_METHOD_JSON, TRANSFORM_METHOD_BINARY]
-ParameterClients = Union["AppConfigDataClient", "SecretsManagerClient", "SSMClient"]
 
 TRANSFORM_METHOD_MAPPING = {
     TRANSFORM_METHOD_JSON: json.loads,
@@ -69,10 +56,14 @@ class BaseProvider(ABC):
 
     store: Dict[Tuple, ExpirableValue]
 
-    def __init__(self):
+    def __init__(self, *, client=None, resource=None):
         """
         Initialize the base provider
         """
+        if client is not None:
+            user_agent.register_feature_to_client(client=client, feature="parameters")
+        if resource is not None:
+            user_agent.register_feature_to_resource(resource=resource, feature="parameters")
 
         self.store: Dict[Tuple, ExpirableValue] = {}
 
@@ -262,78 +253,6 @@ def _build_cache_key(
         """
         return (name, transform, is_nested)
 
-    @staticmethod
-    def _build_boto3_client(
-        service_name: str,
-        client: Optional[ParameterClients] = None,
-        session: Optional[Type[boto3.Session]] = None,
-        config: Optional[Type[Config]] = None,
-    ) -> Type[ParameterClients]:
-        """Builds a low level boto3 client with session and config provided
-
-        Parameters
-        ----------
-        service_name : str
-            AWS service name to instantiate a boto3 client, e.g. ssm
-        client : Optional[ParameterClients], optional
-            boto3 client instance, by default None
-        session : Optional[Type[boto3.Session]], optional
-            boto3 session instance, by default None
-        config : Optional[Type[Config]], optional
-            botocore config instance to configure client with, by default None
-
-        Returns
-        -------
-        Type[ParameterClients]
-            Instance of a boto3 client for Parameters feature (e.g., ssm, appconfig, secretsmanager, etc.)
-        """
-        if client is not None:
-            user_agent.register_feature_to_client(client=client, feature="parameters")
-            return client
-
-        session = session or boto3.Session()
-        config = config or Config()
-        client = session.client(service_name=service_name, config=config)
-        user_agent.register_feature_to_client(client=client, feature="parameters")
-        return client
-
-    # maintenance: change DynamoDBServiceResource type to ParameterResourceClients when we expand
-    @staticmethod
-    def _build_boto3_resource_client(
-        service_name: str,
-        client: Optional["DynamoDBServiceResource"] = None,
-        session: Optional[Type[boto3.Session]] = None,
-        config: Optional[Type[Config]] = None,
-        endpoint_url: Optional[str] = None,
-    ) -> "DynamoDBServiceResource":
-        """Builds a high level boto3 resource client with session, config and endpoint_url provided
-
-        Parameters
-        ----------
-        service_name : str
-            AWS service name to instantiate a boto3 client, e.g. ssm
-        client : Optional[DynamoDBServiceResource], optional
-            boto3 client instance, by default None
-        session : Optional[Type[boto3.Session]], optional
-            boto3 session instance, by default None
-        config : Optional[Type[Config]], optional
-            botocore config instance to configure client, by default None
-
-        Returns
-        -------
-        Type[DynamoDBServiceResource]
-            Instance of a boto3 resource client for Parameters feature (e.g., dynamodb, etc.)
-        """
-        if client is not None:
-            user_agent.register_feature_to_resource(resource=client, feature="parameters")
-            return client
-
-        session = session or boto3.Session()
-        config = config or Config()
-        client = session.resource(service_name=service_name, config=config, endpoint_url=endpoint_url)
-        user_agent.register_feature_to_resource(resource=client, feature="parameters")
-        return client
-
 
 def get_transform_method(value: str, transform: TransformOptions = None) -> Callable[..., Any]:
     """

aws_lambda_powertools/utilities/parameters/dynamodb.py

@@ -11,8 +11,7 @@
 from .base import BaseProvider
 
 if TYPE_CHECKING:
-    from mypy_boto3_dynamodb import DynamoDBServiceResource
-    from mypy_boto3_dynamodb.service_resource import Table
+    from mypy_boto3_dynamodb.service_resource import DynamoDBServiceResource
 
 
 class DynamoDBProvider(BaseProvider):
@@ -162,19 +161,15 @@ def __init__(
         """
         Initialize the DynamoDB client
         """
-        self.table: "Table" = self._build_boto3_resource_client(
-            service_name="dynamodb",
-            client=boto3_client,
-            session=boto3_session,
-            config=config,
-            endpoint_url=endpoint_url,
-        ).Table(table_name)
-
+        if boto3_client is None:
+            boto3_session = boto3_session or boto3.session.Session()
+            boto3_client = boto3_session.resource("dynamodb", config=config, endpoint_url=endpoint_url)
+        self.table = boto3_client.Table(table_name)
         self.key_attr = key_attr
         self.sort_attr = sort_attr
         self.value_attr = value_attr
 
-        super().__init__()
+        super().__init__(resource=boto3_client)
 
     def _get(self, name: str, **sdk_options) -> str:
         """