Add bi-directional GRPC python executor.

[ccsdk/cds.git] / ms / py-executor / blueprints_grpc / request_header_validator_interceptor.py

diff --git a/ms/py-executor/blueprints_grpc/request_header_validator_interceptor.py b/ms/py-executor/blueprints_grpc/request_header_validator_interceptor.py
new file mode 100644 (file)
index 0000000..d9906ab
--- /dev/null
+++ b/ms/py-executor/blueprints_grpc/request_header_validator_interceptor.py
@@ -0,0 +1,40 @@
+#!/usr/bin/python
+#
+# Copyright (C) 2019 Bell Canada.
+# Modifications Copyright © 2018-2019 AT&T Intellectual Property.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import grpc
+
+
+def _unary_unary_rpc_terminator(code, details):
+    def terminate(ignored_request, context):
+        context.abort(code, details)
+
+    return grpc.unary_unary_rpc_method_handler(terminate)
+
+
+class RequestHeaderValidatorInterceptor(grpc.ServerInterceptor):
+
+    def __init__(self, header, value, code, details):
+        self._header = header
+        self._value = value
+        self._terminator = _unary_unary_rpc_terminator(code, details)
+
+    def intercept_service(self, continuation, handler_call_details):
+        if (self._header, self._value) in handler_call_details.invocation_metadata:
+            return continuation(handler_call_details)
+        else:
+            return self._terminator