Introduced InteropContextInspector to be able to peek into server contexts during interop testing.

include/grpc++/server_context.h

@@ -75,6 +75,10 @@ class CallOpBuffer;
 class CompletionQueue;
 class Server;
 
+namespace testing {
+class InteropContextInspector;
+}  // namespace testing
+
 // Interface of server side rpc context.
 class ServerContext {
  public:
@@ -109,6 +113,7 @@ class ServerContext {
   void set_compression_algorithm(grpc_compression_algorithm algorithm);
 
  private:
+  friend class ::grpc::testing::InteropContextInspector;
   friend class ::grpc::Server;
   template <class W, class R>
   friend class ::grpc::ServerAsyncReader;

test/cpp/interop/server_helper.cc

@@ -58,5 +58,9 @@ std::shared_ptr<ServerCredentials> CreateInteropServerCredentials() {
   }
 }
 
+InteropContextInspector::InteropContextInspector(
+    const ::grpc::ServerContext& context)
+    : context_(context) {}
+
 }  // namespace testing
 }  // namespace grpc

test/cpp/interop/server_helper.h

@@ -36,6 +36,7 @@
 
 #include <memory>
 
+#include <grpc++/server_context.h>
 #include <grpc++/server_credentials.h>
 
 namespace grpc {
@@ -43,6 +44,16 @@ namespace testing {
 
 std::shared_ptr<ServerCredentials> CreateInteropServerCredentials();
 
+class InteropContextInspector {
+ public:
+  InteropContextInspector (const ::grpc::ServerContext& context);
+
+  // Inspector methods, able to peek inside ServerContext go here.
+
+ private:
+  const ::grpc::ServerContext& context_;
+};
+
 }  // namespace testing
 }  // namespace grpc