Add an inproc-based non-polling test of core callback API

7 files changed, 598 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32d7a9b94d..a330fefc27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -331,6 +331,7 @@ if(_gRPC_PLATFORM_LINUX)
 add_dependencies(buildtests_c httpscli_test)
 endif()
 add_dependencies(buildtests_c init_test)
+add_dependencies(buildtests_c inproc_callback_test)
 add_dependencies(buildtests_c invalid_call_argument_test)
 add_dependencies(buildtests_c json_rewrite)
 add_dependencies(buildtests_c json_rewrite_test)
@@ -7893,6 +7894,35 @@ target_link_libraries(init_test
 endif (gRPC_BUILD_TESTS)
 if (gRPC_BUILD_TESTS)
 
+add_executable(inproc_callback_test
+  test/core/end2end/inproc_callback_test.cc
+)
+
+
+target_include_directories(inproc_callback_test
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}
+  PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include
+  PRIVATE ${_gRPC_SSL_INCLUDE_DIR}
+  PRIVATE ${_gRPC_PROTOBUF_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ZLIB_INCLUDE_DIR}
+  PRIVATE ${_gRPC_BENCHMARK_INCLUDE_DIR}
+  PRIVATE ${_gRPC_CARES_INCLUDE_DIR}
+  PRIVATE ${_gRPC_GFLAGS_INCLUDE_DIR}
+  PRIVATE ${_gRPC_ADDRESS_SORTING_INCLUDE_DIR}
+  PRIVATE ${_gRPC_NANOPB_INCLUDE_DIR}
+)
+
+target_link_libraries(inproc_callback_test
+  ${_gRPC_ALLTARGETS_LIBRARIES}
+  grpc_test_util
+  grpc
+  gpr_test_util
+  gpr
+)
+
+endif (gRPC_BUILD_TESTS)
+if (gRPC_BUILD_TESTS)
+
 add_executable(invalid_call_argument_test
   test/core/end2end/invalid_call_argument_test.cc
 )
diff --git a/Makefile b/Makefile
index 3454ef8587..e9a9486a3c 100644
--- a/Makefile
+++ b/Makefile
@@ -1053,6 +1053,7 @@ httpcli_format_request_test: $(BINDIR)/$(CONFIG)/httpcli_format_request_test
 httpcli_test: $(BINDIR)/$(CONFIG)/httpcli_test
 httpscli_test: $(BINDIR)/$(CONFIG)/httpscli_test
 init_test: $(BINDIR)/$(CONFIG)/init_test
+inproc_callback_test: $(BINDIR)/$(CONFIG)/inproc_callback_test
 invalid_call_argument_test: $(BINDIR)/$(CONFIG)/invalid_call_argument_test
 json_fuzzer_test: $(BINDIR)/$(CONFIG)/json_fuzzer_test
 json_rewrite: $(BINDIR)/$(CONFIG)/json_rewrite
@@ -1500,6 +1501,7 @@ buildtests_c: privatelibs_c \
   $(BINDIR)/$(CONFIG)/httpcli_test \
   $(BINDIR)/$(CONFIG)/httpscli_test \
   $(BINDIR)/$(CONFIG)/init_test \
+  $(BINDIR)/$(CONFIG)/inproc_callback_test \
   $(BINDIR)/$(CONFIG)/invalid_call_argument_test \
   $(BINDIR)/$(CONFIG)/json_rewrite \
   $(BINDIR)/$(CONFIG)/json_rewrite_test \
@@ -2076,6 +2078,8 @@ test_c: buildtests_c
 	$(Q) $(BINDIR)/$(CONFIG)/httpscli_test || ( echo test httpscli_test failed ; exit 1 )
 	$(E) "[RUN]     Testing init_test"
 	$(Q) $(BINDIR)/$(CONFIG)/init_test || ( echo test init_test failed ; exit 1 )
+	$(E) "[RUN]     Testing inproc_callback_test"
+	$(Q) $(BINDIR)/$(CONFIG)/inproc_callback_test || ( echo test inproc_callback_test failed ; exit 1 )
 	$(E) "[RUN]     Testing invalid_call_argument_test"
 	$(Q) $(BINDIR)/$(CONFIG)/invalid_call_argument_test || ( echo test invalid_call_argument_test failed ; exit 1 )
 	$(E) "[RUN]     Testing json_rewrite_test"
@@ -13115,6 +13119,38 @@ endif
 endif
 
 
+INPROC_CALLBACK_TEST_SRC = \
+    test/core/end2end/inproc_callback_test.cc \
+
+INPROC_CALLBACK_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(INPROC_CALLBACK_TEST_SRC))))
+ifeq ($(NO_SECURE),true)
+
+# You can't build secure targets if you don't have OpenSSL.
+
+$(BINDIR)/$(CONFIG)/inproc_callback_test: openssl_dep_error
+
+else
+
+
+
+$(BINDIR)/$(CONFIG)/inproc_callback_test: $(INPROC_CALLBACK_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+	$(E) "[LD]      Linking $@"
+	$(Q) mkdir -p `dirname $@`
+	$(Q) $(LD) $(LDFLAGS) $(INPROC_CALLBACK_TEST_OBJS) $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LDLIBS) $(LDLIBS_SECURE) -o $(BINDIR)/$(CONFIG)/inproc_callback_test
+
+endif
+
+$(OBJDIR)/$(CONFIG)/test/core/end2end/inproc_callback_test.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr_test_util.a $(LIBDIR)/$(CONFIG)/libgpr.a
+
+deps_inproc_callback_test: $(INPROC_CALLBACK_TEST_OBJS:.o=.dep)
+
+ifneq ($(NO_SECURE),true)
+ifneq ($(NO_DEPS),true)
+-include $(INPROC_CALLBACK_TEST_OBJS:.o=.dep)
+endif
+endif
+
+
 INVALID_CALL_ARGUMENT_TEST_SRC = \
     test/core/end2end/invalid_call_argument_test.cc \
 
diff --git a/build.yaml b/build.yaml
index 34bec00933..bf119cd71b 100644
--- a/build.yaml
+++ b/build.yaml
@@ -3016,6 +3016,19 @@ targets:
   - gpr_test_util
   - gpr
   uses_polling: false
+- name: inproc_callback_test
+  build: test
+  language: c
+  headers:
+  - test/core/end2end/end2end_tests.h
+  src:
+  - test/core/end2end/inproc_callback_test.cc
+  deps:
+  - grpc_test_util
+  - grpc
+  - gpr_test_util
+  - gpr
+  uses_polling: false
 - name: invalid_call_argument_test
   cpu_cost: 0.1
   build: test
diff --git a/test/core/end2end/BUILD b/test/core/end2end/BUILD
index dd16694204..37999a98d1 100644
--- a/test/core/end2end/BUILD
+++ b/test/core/end2end/BUILD
@@ -124,6 +124,19 @@ grpc_cc_test(
 )
 
 grpc_cc_test(
+    name = "inproc_callback_test",
+    srcs = ["inproc_callback_test.cc"],
+    language = "C++",
+    deps = [
+        ':end2end_tests',
+        "//:gpr",
+        "//:grpc",
+        "//test/core/util:gpr_test_util",
+        "//test/core/util:grpc_test_util",
+    ],
+)
+
+grpc_cc_test(
     name = "invalid_call_argument_test",
     srcs = ["invalid_call_argument_test.cc"],
     language = "C++",
diff --git a/test/core/end2end/inproc_callback_test.cc b/test/core/end2end/inproc_callback_test.cc
new file mode 100644
index 0000000000..05257dd4bf
--- /dev/null
+++ b/test/core/end2end/inproc_callback_test.cc
@@ -0,0 +1,462 @@
+/*
+ *
+ * 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 "test/core/end2end/end2end_tests.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+
+#include "src/core/ext/transport/inproc/inproc_transport.h"
+#include "src/core/lib/surface/channel.h"
+#include "src/core/lib/surface/completion_queue.h"
+#include "src/core/lib/surface/server.h"
+#include "test/core/util/port.h"
+#include "test/core/util/test_config.h"
+
+typedef struct inproc_fixture_data {
+  bool dummy;  // reserved for future expansion. Struct can't be empty
+} inproc_fixture_data;
+
+namespace {
+template <typename F>
+class CQDeletingCallback : public grpc_core::CQCallbackInterface {
+ public:
+  explicit CQDeletingCallback(F f) : func_(f) {}
+  ~CQDeletingCallback() override {}
+  void Run(bool ok) override {
+    func_(ok);
+    grpc_core::Delete(this);
+  }
+
+ private:
+  F func_;
+};
+
+template <typename F>
+grpc_core::CQCallbackInterface* NewDeletingCallback(F f) {
+  return grpc_core::New<CQDeletingCallback<F>>(f);
+}
+
+class ShutdownCallback : public grpc_core::CQCallbackInterface {
+ public:
+  ShutdownCallback() : done_(false) {
+    gpr_mu_init(&mu_);
+    gpr_cv_init(&cv_);
+  }
+  ~ShutdownCallback() override {}
+  void Run(bool ok) override {
+    gpr_log(GPR_DEBUG, "CQ shutdown notification invoked");
+    gpr_mu_lock(&mu_);
+    done_ = true;
+    gpr_cv_broadcast(&cv_);
+    gpr_mu_unlock(&mu_);
+  }
+  void Wait(gpr_timespec deadline) {
+    gpr_mu_lock(&mu_);
+    while (!done_ && !gpr_cv_wait(&cv_, &mu_, deadline)) {
+    }
+    gpr_mu_unlock(&mu_);
+  }
+
+ private:
+  bool done_;
+  gpr_mu mu_;
+  gpr_cv cv_;
+};
+
+ShutdownCallback* g_shutdown_callback;
+}  // namespace
+
+static gpr_mu tags_mu;
+static gpr_cv tags_cv;
+const size_t kAvailableTags = 4;
+bool tags[kAvailableTags];
+bool tags_valid[kAvailableTags];
+bool tags_expected[kAvailableTags];
+bool tags_needed[kAvailableTags];
+
+static void expect_tag(intptr_t tag, bool ok) {
+  size_t idx = static_cast<size_t>(tag);
+  GPR_ASSERT(idx < kAvailableTags);
+  tags_needed[idx] = true;
+  tags_expected[idx] = ok;
+}
+
+static void verify_tags(gpr_timespec deadline) {
+  bool done = false;
+
+  gpr_mu_lock(&tags_mu);
+  while (!done) {
+    done = gpr_time_cmp(gpr_now(GPR_CLOCK_MONOTONIC), deadline) > 0;
+    for (size_t i = 0; i < kAvailableTags; i++) {
+      if (tags_needed[i]) {
+        if (tags_valid[i]) {
+          gpr_log(GPR_DEBUG, "Verifying tag %d", static_cast<int>(i));
+          if (tags[i] != tags_expected[i]) {
+            gpr_log(GPR_ERROR, "Got wrong result (%d instead of %d) for tag %d",
+                    tags[i], tags_expected[i], static_cast<int>(i));
+          }
+          tags_valid[i] = false;
+          tags_needed[i] = false;
+        } else if (done) {
+          gpr_log(GPR_ERROR, "Didn't get tag %d", static_cast<int>(i));
+        }
+      }
+    }
+    bool empty = true;
+    for (size_t i = 0; i < kAvailableTags; i++) {
+      if (tags_needed[i]) {
+        empty = false;
+      }
+    }
+    done = done || empty;
+    if (done) {
+      for (size_t i = 0; i < kAvailableTags; i++) {
+        if (tags_valid[i]) {
+          gpr_log(GPR_ERROR, "Got unexpected tag %d and result %d",
+                  static_cast<int>(i), tags[i]);
+        }
+        tags_valid[i] = false;
+      }
+    } else {
+      gpr_cv_wait(&tags_cv, &tags_mu, deadline);
+    }
+  }
+  gpr_mu_unlock(&tags_mu);
+}
+
+static grpc_end2end_test_fixture inproc_create_fixture(
+    grpc_channel_args* client_args, grpc_channel_args* server_args) {
+  grpc_end2end_test_fixture f;
+  inproc_fixture_data* ffd = static_cast<inproc_fixture_data*>(
+      gpr_malloc(sizeof(inproc_fixture_data)));
+  memset(&f, 0, sizeof(f));
+
+  f.fixture_data = ffd;
+  g_shutdown_callback = grpc_core::New<ShutdownCallback>();
+  f.cq =
+      grpc_completion_queue_create_for_callback(g_shutdown_callback, nullptr);
+  f.shutdown_cq = grpc_completion_queue_create_for_pluck(nullptr);
+
+  return f;
+}
+
+void inproc_init_client(grpc_end2end_test_fixture* f,
+                        grpc_channel_args* client_args) {
+  f->client = grpc_inproc_channel_create(f->server, client_args, nullptr);
+  GPR_ASSERT(f->client);
+}
+
+void inproc_init_server(grpc_end2end_test_fixture* f,
+                        grpc_channel_args* server_args) {
+  if (f->server) {
+    grpc_server_destroy(f->server);
+  }
+  f->server = grpc_server_create(server_args, nullptr);
+  grpc_server_register_completion_queue(f->server, f->cq, nullptr);
+  grpc_server_start(f->server);
+}
+
+void inproc_tear_down(grpc_end2end_test_fixture* f) {
+  inproc_fixture_data* ffd = static_cast<inproc_fixture_data*>(f->fixture_data);
+  gpr_free(ffd);
+}
+
+static grpc_core::CQCallbackInterface* tag(intptr_t t) {
+  auto func = [t](bool ok) {
+    gpr_mu_lock(&tags_mu);
+    gpr_log(GPR_DEBUG, "Completing operation %" PRIdPTR, t);
+    bool was_empty = true;
+    for (size_t i = 0; i < kAvailableTags; i++) {
+      if (tags_valid[i]) {
+        was_empty = false;
+      }
+    }
+    size_t idx = static_cast<size_t>(t);
+    tags[idx] = ok;
+    tags_valid[idx] = true;
+    if (was_empty) {
+      gpr_cv_signal(&tags_cv);
+    }
+    gpr_mu_unlock(&tags_mu);
+  };
+  auto cb = NewDeletingCallback(func);
+  return cb;
+}
+
+static grpc_end2end_test_fixture begin_test(grpc_end2end_test_config config,
+                                            const char* test_name,
+                                            grpc_channel_args* client_args,
+                                            grpc_channel_args* server_args) {
+  grpc_end2end_test_fixture f;
+  gpr_log(GPR_INFO, "Running test: %s/%s", test_name, config.name);
+  f = config.create_fixture(client_args, server_args);
+  config.init_server(&f, server_args);
+  config.init_client(&f, client_args);
+  return f;
+}
+
+static gpr_timespec n_seconds_from_now(int n) {
+  return grpc_timeout_seconds_to_deadline(n);
+}
+
+static gpr_timespec five_seconds_from_now() { return n_seconds_from_now(5); }
+
+static void drain_cq(grpc_completion_queue* cq) {
+  g_shutdown_callback->Wait(five_seconds_from_now());
+  gpr_log(GPR_DEBUG, "CQ shutdown wait complete");
+  grpc_core::Delete(g_shutdown_callback);
+}
+
+static void shutdown_server(grpc_end2end_test_fixture* f) {
+  if (!f->server) return;
+  grpc_server_shutdown_and_notify(
+      f->server, f->shutdown_cq,
+      reinterpret_cast<void*>(static_cast<intptr_t>(1000)));
+  GPR_ASSERT(
+      grpc_completion_queue_pluck(f->shutdown_cq, (void*)((intptr_t)1000),
+                                  grpc_timeout_seconds_to_deadline(5), nullptr)
+          .type == GRPC_OP_COMPLETE);
+  grpc_server_destroy(f->server);
+  f->server = nullptr;
+}
+
+static void shutdown_client(grpc_end2end_test_fixture* f) {
+  if (!f->client) return;
+  grpc_channel_destroy(f->client);
+  f->client = nullptr;
+}
+
+static void end_test(grpc_end2end_test_fixture* f) {
+  shutdown_server(f);
+  shutdown_client(f);
+
+  grpc_completion_queue_shutdown(f->cq);
+  drain_cq(f->cq);
+  grpc_completion_queue_destroy(f->cq);
+  grpc_completion_queue_destroy(f->shutdown_cq);
+}
+
+static void simple_request_body(grpc_end2end_test_config config,
+                                grpc_end2end_test_fixture f) {
+  grpc_call* c;
+  grpc_call* s;
+  grpc_op ops[6];
+  grpc_op* op;
+  grpc_metadata_array initial_metadata_recv;
+  grpc_metadata_array trailing_metadata_recv;
+  grpc_metadata_array request_metadata_recv;
+  grpc_call_details call_details;
+  grpc_status_code status;
+  const char* error_string;
+  grpc_call_error error;
+  grpc_slice details;
+  int was_cancelled = 2;
+  char* peer;
+  gpr_timespec deadline = five_seconds_from_now();
+
+  c = grpc_channel_create_call(f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
+                               grpc_slice_from_static_string("/foo"), nullptr,
+                               deadline, nullptr);
+  GPR_ASSERT(c);
+
+  peer = grpc_call_get_peer(c);
+  GPR_ASSERT(peer != nullptr);
+  gpr_log(GPR_DEBUG, "client_peer_before_call=%s", peer);
+  gpr_free(peer);
+
+  grpc_metadata_array_init(&initial_metadata_recv);
+  grpc_metadata_array_init(&trailing_metadata_recv);
+  grpc_metadata_array_init(&request_metadata_recv);
+  grpc_call_details_init(&call_details);
+
+  memset(ops, 0, sizeof(ops));
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  op->op = GRPC_OP_RECV_INITIAL_METADATA;
+  op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
+  op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
+  op->data.recv_status_on_client.status = &status;
+  op->data.recv_status_on_client.status_details = &details;
+  op->data.recv_status_on_client.error_string = &error_string;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), tag(1),
+                                nullptr);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  error = grpc_server_request_call(f.server, &s, &call_details,
+                                   &request_metadata_recv, f.cq, f.cq, tag(2));
+  GPR_ASSERT(GRPC_CALL_OK == error);
+  expect_tag(2, true);
+  verify_tags(deadline);
+
+  peer = grpc_call_get_peer(s);
+  GPR_ASSERT(peer != nullptr);
+  gpr_log(GPR_DEBUG, "server_peer=%s", peer);
+  gpr_free(peer);
+  peer = grpc_call_get_peer(c);
+  GPR_ASSERT(peer != nullptr);
+  gpr_log(GPR_DEBUG, "client_peer=%s", peer);
+  gpr_free(peer);
+
+  memset(ops, 0, sizeof(ops));
+  op = ops;
+  op->op = GRPC_OP_SEND_INITIAL_METADATA;
+  op->data.send_initial_metadata.count = 0;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  op->op = GRPC_OP_SEND_STATUS_FROM_SERVER;
+  op->data.send_status_from_server.trailing_metadata_count = 0;
+  op->data.send_status_from_server.status = GRPC_STATUS_UNIMPLEMENTED;
+  grpc_slice status_details = grpc_slice_from_static_string("xyz");
+  op->data.send_status_from_server.status_details = &status_details;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
+  op->data.recv_close_on_server.cancelled = &was_cancelled;
+  op->flags = 0;
+  op->reserved = nullptr;
+  op++;
+  error = grpc_call_start_batch(s, ops, static_cast<size_t>(op - ops), tag(3),
+                                nullptr);
+  GPR_ASSERT(GRPC_CALL_OK == error);
+
+  expect_tag(3, true);
+  expect_tag(1, true);
+  verify_tags(deadline);
+
+  GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
+  GPR_ASSERT(0 == grpc_slice_str_cmp(details, "xyz"));
+  // the following sanity check makes sure that the requested error string is
+  // correctly populated by the core. It looks for certain substrings that are
+  // not likely to change much. Some parts of the error, like time created,
+  // obviously are not checked.
+  GPR_ASSERT(nullptr != strstr(error_string, "xyz"));
+  GPR_ASSERT(nullptr != strstr(error_string, "description"));
+  GPR_ASSERT(nullptr != strstr(error_string, "Error received from peer"));
+  GPR_ASSERT(nullptr != strstr(error_string, "grpc_message"));
+  GPR_ASSERT(nullptr != strstr(error_string, "grpc_status"));
+  GPR_ASSERT(0 == grpc_slice_str_cmp(call_details.method, "/foo"));
+  GPR_ASSERT(0 == call_details.flags);
+  GPR_ASSERT(was_cancelled == 1);
+
+  grpc_slice_unref(details);
+  gpr_free(static_cast<void*>(const_cast<char*>(error_string)));
+  grpc_metadata_array_destroy(&initial_metadata_recv);
+  grpc_metadata_array_destroy(&trailing_metadata_recv);
+  grpc_metadata_array_destroy(&request_metadata_recv);
+  grpc_call_details_destroy(&call_details);
+
+  grpc_call_unref(c);
+  grpc_call_unref(s);
+
+  int expected_calls = 1;
+  if (config.feature_mask & FEATURE_MASK_SUPPORTS_REQUEST_PROXYING) {
+    expected_calls *= 2;
+  }
+}
+
+static void test_invoke_simple_request(grpc_end2end_test_config config) {
+  grpc_end2end_test_fixture f;
+
+  f = begin_test(config, "test_invoke_simple_request", nullptr, nullptr);
+  simple_request_body(config, f);
+  end_test(&f);
+  config.tear_down_data(&f);
+}
+
+static void test_invoke_10_simple_requests(grpc_end2end_test_config config) {
+  int i;
+  grpc_end2end_test_fixture f =
+      begin_test(config, "test_invoke_10_simple_requests", nullptr, nullptr);
+  for (i = 0; i < 10; i++) {
+    simple_request_body(config, f);
+    gpr_log(GPR_INFO, "Running test: Passed simple request %d", i);
+  }
+  end_test(&f);
+  config.tear_down_data(&f);
+}
+
+static void test_invoke_many_simple_requests(grpc_end2end_test_config config) {
+  int i;
+  const int many = 1000;
+  grpc_end2end_test_fixture f =
+      begin_test(config, "test_invoke_many_simple_requests", nullptr, nullptr);
+  gpr_timespec t1 = gpr_now(GPR_CLOCK_MONOTONIC);
+  for (i = 0; i < many; i++) {
+    simple_request_body(config, f);
+  }
+  double us =
+      gpr_timespec_to_micros(gpr_time_sub(gpr_now(GPR_CLOCK_MONOTONIC), t1)) /
+      many;
+  gpr_log(GPR_INFO, "Time per ping %f us", us);
+  end_test(&f);
+  config.tear_down_data(&f);
+}
+
+static void simple_request(grpc_end2end_test_config config) {
+  int i;
+  for (i = 0; i < 10; i++) {
+    test_invoke_simple_request(config);
+  }
+  test_invoke_10_simple_requests(config);
+  test_invoke_many_simple_requests(config);
+}
+
+static void simple_request_pre_init() {
+  gpr_mu_init(&tags_mu);
+  gpr_cv_init(&tags_cv);
+}
+
+/* All test configurations */
+static grpc_end2end_test_config configs[] = {
+    {"inproc-callback", FEATURE_MASK_SUPPORTS_AUTHORITY_HEADER, nullptr,
+     inproc_create_fixture, inproc_init_client, inproc_init_server,
+     inproc_tear_down},
+};
+
+int main(int argc, char** argv) {
+  grpc_test_init(argc, argv);
+  grpc_init();
+
+  simple_request_pre_init();
+  simple_request(configs[0]);
+
+  grpc_shutdown();
+
+  return 0;
+}
diff --git a/tools/run_tests/generated/sources_and_headers.json b/tools/run_tests/generated/sources_and_headers.json
index bff045f786..3a7db7d107 100644
--- a/tools/run_tests/generated/sources_and_headers.json
+++ b/tools/run_tests/generated/sources_and_headers.json
@@ -1417,6 +1417,26 @@
       "grpc", 
       "grpc_test_util"
     ], 
+    "headers": [
+      "test/core/end2end/end2end_tests.h"
+    ], 
+    "is_filegroup": false, 
+    "language": "c", 
+    "name": "inproc_callback_test", 
+    "src": [
+      "test/core/end2end/end2end_tests.h", 
+      "test/core/end2end/inproc_callback_test.cc"
+    ], 
+    "third_party": false, 
+    "type": "target"
+  }, 
+  {
+    "deps": [
+      "gpr", 
+      "gpr_test_util", 
+      "grpc", 
+      "grpc_test_util"
+    ], 
     "headers": [], 
     "is_filegroup": false, 
     "language": "c", 
diff --git a/tools/run_tests/generated/tests.json b/tools/run_tests/generated/tests.json
index a51be28ad5..51c7b57d8a 100644
--- a/tools/run_tests/generated/tests.json
+++ b/tools/run_tests/generated/tests.json
@@ -1706,6 +1706,30 @@
       "posix", 
       "windows"
     ], 
+    "cpu_cost": 1.0, 
+    "exclude_configs": [], 
+    "exclude_iomgrs": [], 
+    "flaky": false, 
+    "gtest": false, 
+    "language": "c", 
+    "name": "inproc_callback_test", 
+    "platforms": [
+      "linux", 
+      "mac", 
+      "posix", 
+      "windows"
+    ], 
+    "uses_polling": false
+  }, 
+  {
+    "args": [], 
+    "benchmark": false, 
+    "ci_platforms": [
+      "linux", 
+      "mac", 
+      "posix", 
+      "windows"
+    ], 
     "cpu_cost": 0.1, 
     "exclude_configs": [], 
     "exclude_iomgrs": [],