feat(models): Add VPC endpoint support to BedrockModel class (#502)

Co-authored-by: Dean Schmigelski <dbschmigelski+github@gmail.com>

Author: dbavro19

src/strands/models/bedrock.py

@@ -103,6 +103,7 @@ def __init__(
         boto_session: Optional[boto3.Session] = None,
         boto_client_config: Optional[BotocoreConfig] = None,
         region_name: Optional[str] = None,
+        endpoint_url: Optional[str] = None,
         **model_config: Unpack[BedrockConfig],
     ):
         """Initialize provider instance.
@@ -112,6 +113,7 @@ def __init__(
             boto_client_config: Configuration to use when creating the Bedrock-Runtime Boto Client.
             region_name: AWS region to use for the Bedrock service.
                 Defaults to the AWS_REGION environment variable if set, or "us-west-2" if not set.
+            endpoint_url: Custom endpoint URL for VPC endpoints (PrivateLink)
             **model_config: Configuration options for the Bedrock model.
         """
         if region_name and boto_session:
@@ -143,6 +145,7 @@ def __init__(
         self.client = session.client(
             service_name="bedrock-runtime",
             config=client_config,
+            endpoint_url=endpoint_url,
             region_name=resolved_region,
         )
 

tests/strands/models/test_bedrock.py

@@ -129,7 +129,7 @@ def test__init__with_default_region(session_cls, mock_client_method):
     with unittest.mock.patch.object(os, "environ", {}):
         BedrockModel()
         session_cls.return_value.client.assert_called_with(
-            region_name=DEFAULT_BEDROCK_REGION, config=ANY, service_name=ANY
+            region_name=DEFAULT_BEDROCK_REGION, config=ANY, service_name=ANY, endpoint_url=None
         )
 
 
@@ -139,22 +139,22 @@ def test__init__with_session_region(session_cls, mock_client_method):
 
     BedrockModel()
 
-    mock_client_method.assert_called_with(region_name="eu-blah-1", config=ANY, service_name=ANY)
+    mock_client_method.assert_called_with(region_name="eu-blah-1", config=ANY, service_name=ANY, endpoint_url=None)
 
 
 def test__init__with_custom_region(mock_client_method):
     """Test that BedrockModel uses the provided region."""
     custom_region = "us-east-1"
     BedrockModel(region_name=custom_region)
-    mock_client_method.assert_called_with(region_name=custom_region, config=ANY, service_name=ANY)
+    mock_client_method.assert_called_with(region_name=custom_region, config=ANY, service_name=ANY, endpoint_url=None)
 
 
 def test__init__with_default_environment_variable_region(mock_client_method):
     """Test that BedrockModel uses the AWS_REGION since we code that in."""
     with unittest.mock.patch.object(os, "environ", {"AWS_REGION": "eu-west-2"}):
         BedrockModel()
 
-    mock_client_method.assert_called_with(region_name="eu-west-2", config=ANY, service_name=ANY)
+    mock_client_method.assert_called_with(region_name="eu-west-2", config=ANY, service_name=ANY, endpoint_url=None)
 
 
 def test__init__region_precedence(mock_client_method, session_cls):
@@ -164,21 +164,38 @@ def test__init__region_precedence(mock_client_method, session_cls):
 
         # specifying a region always wins out
         BedrockModel(region_name="us-specified-1")
-        mock_client_method.assert_called_with(region_name="us-specified-1", config=ANY, service_name=ANY)
+        mock_client_method.assert_called_with(
+            region_name="us-specified-1", config=ANY, service_name=ANY, endpoint_url=None
+        )
 
         # other-wise uses the session's
         BedrockModel()
-        mock_client_method.assert_called_with(region_name="us-session-1", config=ANY, service_name=ANY)
+        mock_client_method.assert_called_with(
+            region_name="us-session-1", config=ANY, service_name=ANY, endpoint_url=None
+        )
 
         # environment variable next
         session_cls.return_value.region_name = None
         BedrockModel()
-        mock_client_method.assert_called_with(region_name="us-environment-1", config=ANY, service_name=ANY)
+        mock_client_method.assert_called_with(
+            region_name="us-environment-1", config=ANY, service_name=ANY, endpoint_url=None
+        )
 
         mock_os_environ.pop("AWS_REGION")
         session_cls.return_value.region_name = None  # No session region
         BedrockModel()
-        mock_client_method.assert_called_with(region_name=DEFAULT_BEDROCK_REGION, config=ANY, service_name=ANY)
+        mock_client_method.assert_called_with(
+            region_name=DEFAULT_BEDROCK_REGION, config=ANY, service_name=ANY, endpoint_url=None
+        )
+
+
+def test__init__with_endpoint_url(mock_client_method):
+    """Test that BedrockModel uses the provided endpoint_url for VPC endpoints."""
+    custom_endpoint = "https://vpce-12345-abcde.bedrock-runtime.us-west-2.vpce.amazonaws.com"
+    BedrockModel(endpoint_url=custom_endpoint)
+    mock_client_method.assert_called_with(
+        region_name=DEFAULT_BEDROCK_REGION, config=ANY, service_name=ANY, endpoint_url=custom_endpoint
+    )
 
 
 def test__init__with_region_and_session_raises_value_error():