chore: move client cache into a "private" module

Author: mattsb42-aws

doc/index.rst

@@ -17,7 +17,6 @@ Modules
     aws_encryption_sdk.keyrings.base
     aws_encryption_sdk.keyrings.aws_kms
     aws_encryption_sdk.keyrings.aws_kms.client_suppliers
-    aws_encryption_sdk.keyrings.aws_kms.client_cache
     aws_encryption_sdk.keyrings.multi
     aws_encryption_sdk.keyrings.raw
     aws_encryption_sdk.key_providers.base
@@ -45,5 +44,6 @@ Modules
     aws_encryption_sdk.internal.structures
     aws_encryption_sdk.internal.validators
     aws_encryption_sdk.internal.utils
+    aws_encryption_sdk.keyrings.aws_kms._client_cache
 
 .. include:: ../CHANGELOG.rst

src/aws_encryption_sdk/keyrings/aws_kms/client_cache.py renamed to src/aws_encryption_sdk/keyrings/aws_kms/_client_cache.py

@@ -4,6 +4,10 @@
 
 .. versionadded:: 1.5.0
 
+.. warning::
+    No guarantee is provided on the modules and APIs within this
+    namespace staying consistent. Directly reference at your own risk.
+
 """
 import functools
 import logging

src/aws_encryption_sdk/keyrings/aws_kms/client_suppliers.py

@@ -19,7 +19,7 @@
 from aws_encryption_sdk.identifiers import USER_AGENT_SUFFIX
 from aws_encryption_sdk.internal.validators import value_is_not_a_string
 
-from .client_cache import ClientCache
+from ._client_cache import ClientCache
 
 try:  # Python 3.5.0 and 3.5.1 have incompatible typing modules
     from typing import Callable, Union  # noqa pylint: disable=unused-import

test/functional/keyrings/aws_kms/test_client_cache.py

@@ -5,7 +5,7 @@
 from botocore.config import Config
 from botocore.session import Session
 
-from aws_encryption_sdk.keyrings.aws_kms.client_cache import ClientCache
+from aws_encryption_sdk.keyrings.aws_kms._client_cache import ClientCache
 
 pytestmark = [pytest.mark.functional, pytest.mark.local]
 

test/integration/keyrings/aws_kms/test_client_cache.py

@@ -6,7 +6,7 @@
 from botocore.exceptions import BotoCoreError
 from botocore.session import Session
 
-from aws_encryption_sdk.keyrings.aws_kms.client_cache import ClientCache
+from aws_encryption_sdk.keyrings.aws_kms._client_cache import ClientCache
 
 pytestmark = [pytest.mark.integ]