From aecc5f7285faedec634c99aff0b48eea86d3861a Mon Sep 17 00:00:00 2001
From: Yash Tibrewal <yashkt@google.com>
Date: Fri, 28 Dec 2018 16:03:20 -0800
Subject: Add client interceptor test for bidi streaming hijacking interceptor

---
 .../end2end/client_interceptors_end2end_test.cc    | 91 ++++++++++++++++++++++
 test/cpp/end2end/interceptors_util.cc              | 10 +++
 test/cpp/end2end/interceptors_util.h               |  3 +
 3 files changed, 104 insertions(+)

(limited to 'test')

diff --git a/test/cpp/end2end/client_interceptors_end2end_test.cc b/test/cpp/end2end/client_interceptors_end2end_test.cc
index 8abf4eb3f4..ab387aa914 100644
--- a/test/cpp/end2end/client_interceptors_end2end_test.cc
+++ b/test/cpp/end2end/client_interceptors_end2end_test.cc
@@ -270,6 +270,84 @@ class HijackingInterceptorMakesAnotherCallFactory
   }
 };
 
+class BidiStreamingRpcHijackingInterceptor : public experimental::Interceptor {
+ public:
+  BidiStreamingRpcHijackingInterceptor(experimental::ClientRpcInfo* info) {
+    info_ = info;
+  }
+
+  virtual void Intercept(experimental::InterceptorBatchMethods* methods) {
+    bool hijack = false;
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::PRE_SEND_INITIAL_METADATA)) {
+      CheckMetadata(*methods->GetSendInitialMetadata(), "testkey", "testvalue");
+      hijack = true;
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::PRE_SEND_MESSAGE)) {
+      EchoRequest req;
+      auto* buffer = methods->GetSendMessage();
+      auto copied_buffer = *buffer;
+      EXPECT_TRUE(
+          SerializationTraits<EchoRequest>::Deserialize(&copied_buffer, &req)
+              .ok());
+      EXPECT_EQ(req.message().find("Hello"), 0);
+      msg = req.message();
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::PRE_SEND_CLOSE)) {
+      // Got nothing to do here for now
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::POST_RECV_STATUS)) {
+      CheckMetadata(*methods->GetRecvTrailingMetadata(), "testkey",
+                    "testvalue");
+      auto* status = methods->GetRecvStatus();
+      EXPECT_EQ(status->ok(), true);
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::PRE_RECV_MESSAGE)) {
+      EchoResponse* resp =
+          static_cast<EchoResponse*>(methods->GetRecvMessage());
+      resp->set_message(msg);
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::POST_RECV_MESSAGE)) {
+      EXPECT_EQ(static_cast<EchoResponse*>(methods->GetRecvMessage())
+                    ->message()
+                    .find("Hello"),
+                0);
+    }
+    if (methods->QueryInterceptionHookPoint(
+            experimental::InterceptionHookPoints::PRE_RECV_STATUS)) {
+      auto* map = methods->GetRecvTrailingMetadata();
+      // insert the metadata that we want
+      EXPECT_EQ(map->size(), static_cast<unsigned>(0));
+      map->insert(std::make_pair("testkey", "testvalue"));
+      auto* status = methods->GetRecvStatus();
+      *status = Status(StatusCode::OK, "");
+    }
+    if (hijack) {
+      methods->Hijack();
+    } else {
+      methods->Proceed();
+    }
+  }
+
+ private:
+  experimental::ClientRpcInfo* info_;
+  grpc::string msg;
+};
+
+class BidiStreamingRpcHijackingInterceptorFactory
+    : public experimental::ClientInterceptorFactoryInterface {
+ public:
+  virtual experimental::Interceptor* CreateClientInterceptor(
+      experimental::ClientRpcInfo* info) override {
+    return new BidiStreamingRpcHijackingInterceptor(info);
+  }
+};
+
 class LoggingInterceptor : public experimental::Interceptor {
  public:
   LoggingInterceptor(experimental::ClientRpcInfo* info) { info_ = info; }
@@ -546,6 +624,19 @@ TEST_F(ClientInterceptorsStreamingEnd2endTest, ServerStreamingTest) {
   EXPECT_EQ(DummyInterceptor::GetNumTimesRun(), 20);
 }
 
+TEST_F(ClientInterceptorsStreamingEnd2endTest, BidiStreamingHijackingTest) {
+  ChannelArguments args;
+  DummyInterceptor::Reset();
+  std::vector<std::unique_ptr<experimental::ClientInterceptorFactoryInterface>>
+      creators;
+  creators.push_back(
+      std::unique_ptr<BidiStreamingRpcHijackingInterceptorFactory>(
+          new BidiStreamingRpcHijackingInterceptorFactory()));
+  auto channel = experimental::CreateCustomChannelWithInterceptors(
+      server_address_, InsecureChannelCredentials(), args, std::move(creators));
+  MakeBidiStreamingCall(channel);
+}
+
 TEST_F(ClientInterceptorsStreamingEnd2endTest, BidiStreamingTest) {
   ChannelArguments args;
   DummyInterceptor::Reset();
diff --git a/test/cpp/end2end/interceptors_util.cc b/test/cpp/end2end/interceptors_util.cc
index e0ad7d1526..900f02b5f3 100644
--- a/test/cpp/end2end/interceptors_util.cc
+++ b/test/cpp/end2end/interceptors_util.cc
@@ -132,6 +132,16 @@ bool CheckMetadata(const std::multimap<grpc::string_ref, grpc::string_ref>& map,
   return false;
 }
 
+bool CheckMetadata(const std::multimap<grpc::string, grpc::string>& map,
+                   const string& key, const string& value) {
+  for (const auto& pair : map) {
+    if (pair.first == key && pair.second == value) {
+      return true;
+    }
+  }
+  return false;
+}
+
 std::vector<std::unique_ptr<experimental::ClientInterceptorFactoryInterface>>
 CreateDummyClientInterceptors() {
   std::vector<std::unique_ptr<experimental::ClientInterceptorFactoryInterface>>
diff --git a/test/cpp/end2end/interceptors_util.h b/test/cpp/end2end/interceptors_util.h
index 659e613d2e..419845e5f6 100644
--- a/test/cpp/end2end/interceptors_util.h
+++ b/test/cpp/end2end/interceptors_util.h
@@ -165,6 +165,9 @@ void MakeCallbackCall(const std::shared_ptr<Channel>& channel);
 bool CheckMetadata(const std::multimap<grpc::string_ref, grpc::string_ref>& map,
                    const string& key, const string& value);
 
+bool CheckMetadata(const std::multimap<grpc::string, grpc::string>& map,
+                   const string& key, const string& value);
+
 std::vector<std::unique_ptr<experimental::ClientInterceptorFactoryInterface>>
 CreateDummyClientInterceptors();
 
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