Merge pull request #14397 from vjpai/nb2

Add a separate test for non-blocking polling and RPCs

2 files changed, 212 insertions, 0 deletions

diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index 27e8da1ff1..afa054ae10 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -242,6 +242,24 @@ grpc_cc_test(
 )
 
 grpc_cc_test(
+    name = "nonblocking_test",
+    srcs = ["nonblocking_test.cc"],
+    external_deps = [
+        "gtest",
+    ],
+    deps = [
+        "//:gpr",
+        "//:grpc",
+        "//:grpc++",
+        "//src/proto/grpc/testing:echo_messages_proto",
+        "//src/proto/grpc/testing:echo_proto",
+        "//test/core/util:gpr_test_util",
+        "//test/core/util:grpc_test_util",
+        "//test/cpp/util:test_util",
+    ],
+)
+
+grpc_cc_test(
     name = "client_lb_end2end_test",
     srcs = ["client_lb_end2end_test.cc"],
     external_deps = [
diff --git a/test/cpp/end2end/nonblocking_test.cc b/test/cpp/end2end/nonblocking_test.cc
new file mode 100644
index 0000000000..509c5de0b6
--- /dev/null
+++ b/test/cpp/end2end/nonblocking_test.cc
@@ -0,0 +1,194 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * 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.
+ *
+ */
+
+#include <memory>
+
+#include <grpc++/channel.h>
+#include <grpc++/client_context.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/server.h>
+#include <grpc++/server_builder.h>
+#include <grpc++/server_context.h>
+
+#include "src/core/lib/gpr/tls.h"
+#include "src/core/lib/iomgr/port.h"
+#include "src/proto/grpc/testing/echo.grpc.pb.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+
+#ifdef GRPC_POSIX_SOCKET
+#include "src/core/lib/iomgr/ev_posix.h"
+#endif  // GRPC_POSIX_SOCKET
+
+#include <gtest/gtest.h>
+
+#ifdef GRPC_POSIX_SOCKET
+// Thread-local variable to so that only polls from this test assert
+// non-blocking (not polls from resolver, timer thread, etc)
+GPR_TLS_DECL(g_is_nonblocking_test);
+
+namespace {
+
+int maybe_assert_non_blocking_poll(struct pollfd* pfds, nfds_t nfds,
+                                   int timeout) {
+  if (gpr_tls_get(&g_is_nonblocking_test)) {
+    GPR_ASSERT(timeout == 0);
+  }
+  return poll(pfds, nfds, timeout);
+}
+
+}  // namespace
+
+namespace grpc {
+namespace testing {
+namespace {
+
+void* tag(int i) { return reinterpret_cast<void*>(static_cast<intptr_t>(i)); }
+int detag(void* p) { return static_cast<int>(reinterpret_cast<intptr_t>(p)); }
+
+class NonblockingTest : public ::testing::Test {
+ protected:
+  NonblockingTest() {}
+
+  void SetUp() override {
+    port_ = grpc_pick_unused_port_or_die();
+    server_address_ << "localhost:" << port_;
+
+    // Setup server
+    BuildAndStartServer();
+  }
+
+  bool LoopForTag(void** tag, bool* ok) {
+    for (;;) {
+      auto r = cq_->AsyncNext(tag, ok, gpr_time_0(GPR_CLOCK_REALTIME));
+      if (r == CompletionQueue::SHUTDOWN) {
+        return false;
+      } else if (r == CompletionQueue::GOT_EVENT) {
+        return true;
+      }
+    }
+  }
+
+  void TearDown() override {
+    server_->Shutdown();
+    void* ignored_tag;
+    bool ignored_ok;
+    cq_->Shutdown();
+    while (LoopForTag(&ignored_tag, &ignored_ok))
+      ;
+    stub_.reset();
+    grpc_recycle_unused_port(port_);
+  }
+
+  void BuildAndStartServer() {
+    ServerBuilder builder;
+    builder.AddListeningPort(server_address_.str(),
+                             grpc::InsecureServerCredentials());
+    service_.reset(new grpc::testing::EchoTestService::AsyncService());
+    builder.RegisterService(service_.get());
+    cq_ = builder.AddCompletionQueue();
+    server_ = builder.BuildAndStart();
+  }
+
+  void ResetStub() {
+    std::shared_ptr<Channel> channel = CreateChannel(
+        server_address_.str(), grpc::InsecureChannelCredentials());
+    stub_ = grpc::testing::EchoTestService::NewStub(channel);
+  }
+
+  void SendRpc(int num_rpcs) {
+    for (int i = 0; i < num_rpcs; i++) {
+      EchoRequest send_request;
+      EchoRequest recv_request;
+      EchoResponse send_response;
+      EchoResponse recv_response;
+      Status recv_status;
+
+      ClientContext cli_ctx;
+      ServerContext srv_ctx;
+      grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);
+
+      send_request.set_message("hello non-blocking world");
+      std::unique_ptr<ClientAsyncResponseReader<EchoResponse>> response_reader(
+          stub_->PrepareAsyncEcho(&cli_ctx, send_request, cq_.get()));
+
+      response_reader->StartCall();
+
+      service_->RequestEcho(&srv_ctx, &recv_request, &response_writer,
+                            cq_.get(), cq_.get(), tag(2));
+
+      void* got_tag;
+      bool ok;
+      EXPECT_TRUE(LoopForTag(&got_tag, &ok));
+      EXPECT_TRUE(ok);
+      EXPECT_EQ(detag(got_tag), 2);
+      EXPECT_EQ(send_request.message(), recv_request.message());
+
+      send_response.set_message(recv_request.message());
+      response_writer.Finish(send_response, Status::OK, tag(3));
+      response_reader->Finish(&recv_response, &recv_status, tag(4));
+
+      int tagsum = 0;
+      int tagprod = 1;
+      EXPECT_TRUE(LoopForTag(&got_tag, &ok));
+      EXPECT_TRUE(ok);
+      tagsum += detag(got_tag);
+      tagprod *= detag(got_tag);
+
+      EXPECT_TRUE(LoopForTag(&got_tag, &ok));
+      EXPECT_TRUE(ok);
+      tagsum += detag(got_tag);
+      tagprod *= detag(got_tag);
+
+      EXPECT_EQ(tagsum, 7);
+      EXPECT_EQ(tagprod, 12);
+      EXPECT_EQ(send_response.message(), recv_response.message());
+      EXPECT_TRUE(recv_status.ok());
+    }
+  }
+
+  std::unique_ptr<ServerCompletionQueue> cq_;
+  std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
+  std::unique_ptr<Server> server_;
+  std::unique_ptr<grpc::testing::EchoTestService::AsyncService> service_;
+  std::ostringstream server_address_;
+  int port_;
+};
+
+TEST_F(NonblockingTest, SimpleRpc) {
+  ResetStub();
+  SendRpc(10);
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace grpc
+
+#endif  // GRPC_POSIX_SOCKET
+
+int main(int argc, char** argv) {
+#ifdef GRPC_POSIX_SOCKET
+  // Override the poll function before anything else can happen
+  grpc_poll_function = maybe_assert_non_blocking_poll;
+#endif  // GRPC_POSIX_SOCKET
+
+  grpc_test_init(argc, argv);
+  ::testing::InitGoogleTest(&argc, argv);
+  int ret = RUN_ALL_TESTS();
+  return ret;
+}