test/core/end2end/tests/filter_call_init_fails.cc - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2016 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 <limits.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>

 #include <grpc/byte_buffer.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/time.h>
 #include <grpc/support/useful.h>
 #include "src/core/lib/channel/channel_stack_builder.h"
 #include "src/core/lib/surface/channel_init.h"
 #include "test/core/end2end/cq_verifier.h"

 enum { TIMEOUT = 200000 };

 static bool g_enable_server_channel_filter = false;
 static bool g_enable_client_channel_filter = false;
 static bool g_enable_client_subchannel_filter = false;

 static void* tag(intptr_t t) { return (void*)t; }

 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(void) {
   return n_seconds_from_now(5);
 }

 static void drain_cq(grpc_completion_queue* cq) {
   grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_from_now(), nullptr);
   } while (ev.type != GRPC_QUEUE_SHUTDOWN);
 }

 static void shutdown_server(grpc_end2end_test_fixture* f) {
   if (!f->server) return;
   grpc_server_shutdown_and_notify(f->server, f->shutdown_cq, tag(1000));
   GPR_ASSERT(grpc_completion_queue_pluck(f->shutdown_cq, tag(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);
 }

 // Simple request via a SERVER_CHANNEL filter that always fails to
 // initialize the call.
 static void test_server_channel_filter(grpc_end2end_test_config config) {
   grpc_call* c;
   grpc_call* s;
   grpc_slice request_payload_slice =
       grpc_slice_from_copied_string("hello world");
   grpc_byte_buffer* request_payload =
       grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   grpc_end2end_test_fixture f =
       begin_test(config, "filter_call_init_fails", nullptr, nullptr);
   cq_verifier* cqv = cq_verifier_create(f.cq);
   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_byte_buffer* request_payload_recv = nullptr;
   grpc_call_details call_details;
   grpc_status_code status;
   grpc_call_error error;
   grpc_slice details;

   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"),
       get_host_override_slice("foo.test.google.fr:1234", config), deadline,
       nullptr);
   GPR_ASSERT(c);

   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->data.send_initial_metadata.metadata = nullptr;
   op->flags = 0;
   op->reserved = nullptr;
   op++;
   op->op = GRPC_OP_SEND_MESSAGE;
   op->data.send_message.send_message = request_payload;
   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->flags = 0;
   op->reserved = nullptr;
   op++;
   error = grpc_call_start_batch(c, ops, (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(101));
   GPR_ASSERT(GRPC_CALL_OK == error);

   CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
   cq_verify(cqv);

   GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
   GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

   grpc_slice_unref(details);
   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);

   cq_verifier_destroy(cqv);

   grpc_byte_buffer_destroy(request_payload);
   grpc_byte_buffer_destroy(request_payload_recv);

   end_test(&f);
   config.tear_down_data(&f);
 }

 // Simple request via a CLIENT_CHANNEL or CLIENT_DIRECT_CHANNEL filter
 // that always fails to initialize the call.
 static void test_client_channel_filter(grpc_end2end_test_config config) {
   grpc_call* c;
   grpc_slice request_payload_slice =
       grpc_slice_from_copied_string("hello world");
   grpc_byte_buffer* request_payload =
       grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   gpr_timespec deadline = five_seconds_from_now();
   grpc_end2end_test_fixture f =
       begin_test(config, "filter_call_init_fails", nullptr, nullptr);
   cq_verifier* cqv = cq_verifier_create(f.cq);
   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_byte_buffer* request_payload_recv = nullptr;
   grpc_call_details call_details;
   grpc_status_code status;
   grpc_call_error error;
   grpc_slice details;

   c = grpc_channel_create_call(
       f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
       grpc_slice_from_static_string("/foo"),
       get_host_override_slice("foo.test.google.fr:1234", config), deadline,
       nullptr);
   GPR_ASSERT(c);

   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->data.send_initial_metadata.metadata = nullptr;
   op->flags = 0;
   op->reserved = nullptr;
   op++;
   op->op = GRPC_OP_SEND_MESSAGE;
   op->data.send_message.send_message = request_payload;
   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->flags = 0;
   op->reserved = nullptr;
   op++;
   error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), nullptr);
   GPR_ASSERT(GRPC_CALL_OK == error);

   CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
   cq_verify(cqv);

   GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
   GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

   grpc_slice_unref(details);
   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);

   cq_verifier_destroy(cqv);

   grpc_byte_buffer_destroy(request_payload);
   grpc_byte_buffer_destroy(request_payload_recv);

   end_test(&f);
   config.tear_down_data(&f);
 }

 // Simple request via a CLIENT_SUBCHANNEL filter that always fails to
 // initialize the call.
 static void test_client_subchannel_filter(grpc_end2end_test_config config) {
   grpc_call* c;
   grpc_slice request_payload_slice =
       grpc_slice_from_copied_string("hello world");
   grpc_byte_buffer* request_payload =
       grpc_raw_byte_buffer_create(&request_payload_slice, 1);
   gpr_timespec deadline = five_seconds_from_now();
   grpc_end2end_test_fixture f =
       begin_test(config, "filter_call_init_fails", nullptr, nullptr);
   cq_verifier* cqv = cq_verifier_create(f.cq);
   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_byte_buffer* request_payload_recv = nullptr;
   grpc_call_details call_details;
   grpc_status_code status;
   grpc_call_error error;
   grpc_slice details;

   c = grpc_channel_create_call(
       f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
       grpc_slice_from_static_string("/foo"),
       get_host_override_slice("foo.test.google.fr:1234", config), deadline,
       nullptr);
   GPR_ASSERT(c);

   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->data.send_initial_metadata.metadata = nullptr;
   op->flags = 0;
   op->reserved = nullptr;
   op++;
   op->op = GRPC_OP_SEND_MESSAGE;
   op->data.send_message.send_message = request_payload;
   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->flags = 0;
   op->reserved = nullptr;
   op++;

   error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), nullptr);
   GPR_ASSERT(GRPC_CALL_OK == error);

   CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
   cq_verify(cqv);

   GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
   GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

   // Reset and create a new call.  (The first call uses a different code
   // path in client_channel.c than subsequent calls on the same channel,
   // and we need to test both.)
   grpc_call_unref(c);
   status = GRPC_STATUS_OK;
   grpc_slice_unref(details);
   details = grpc_empty_slice();

   c = grpc_channel_create_call(
       f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
       grpc_slice_from_static_string("/foo"),
       get_host_override_slice("foo.test.google.fr:1234", config), deadline,
       nullptr);
   GPR_ASSERT(c);

   error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(2), nullptr);
   GPR_ASSERT(GRPC_CALL_OK == error);

   CQ_EXPECT_COMPLETION(cqv, tag(2), 1);
   cq_verify(cqv);

   GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
   GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

   grpc_slice_unref(details);
   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);

   cq_verifier_destroy(cqv);

   grpc_byte_buffer_destroy(request_payload);
   grpc_byte_buffer_destroy(request_payload_recv);

   end_test(&f);
   config.tear_down_data(&f);
 }

 /*******************************************************************************
  * Test filter - always fails to initialize a call
  */

 static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   return grpc_error_set_int(
       GRPC_ERROR_CREATE_FROM_STATIC_STRING("access denied"),
       GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_PERMISSION_DENIED);
 }

 static void destroy_call_elem(grpc_call_element* elem,
                               const grpc_call_final_info* final_info,
                               grpc_closure* ignored) {}

 static grpc_error* init_channel_elem(grpc_channel_element* elem,
                                      grpc_channel_element_args* args) {
   return GRPC_ERROR_NONE;
 }

 static void destroy_channel_elem(grpc_channel_element* elem) {}

 static const grpc_channel_filter test_filter = {
     grpc_call_next_op,
     grpc_channel_next_op,
     0,
     init_call_elem,
     grpc_call_stack_ignore_set_pollset_or_pollset_set,
     destroy_call_elem,
     0,
     init_channel_elem,
     destroy_channel_elem,
     grpc_channel_next_get_info,
     "filter_call_init_fails"};

 /*******************************************************************************
  * Registration
  */

 static bool maybe_add_server_channel_filter(grpc_channel_stack_builder* builder,
                                             void* arg) {
   if (g_enable_server_channel_filter) {
     // Want to add the filter as close to the end as possible, to make
     // sure that all of the filters work well together.  However, we
     // can't add it at the very end, because the connected channel filter
     // must be the last one.  So we add it right before the last one.
     grpc_channel_stack_builder_iterator* it =
         grpc_channel_stack_builder_create_iterator_at_last(builder);
     GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
     const bool retval = grpc_channel_stack_builder_add_filter_before(
         it, &test_filter, nullptr, nullptr);
     grpc_channel_stack_builder_iterator_destroy(it);
     return retval;
   } else {
     return true;
   }
 }

 static bool maybe_add_client_channel_filter(grpc_channel_stack_builder* builder,
                                             void* arg) {
   if (g_enable_client_channel_filter) {
     // Want to add the filter as close to the end as possible, to make
     // sure that all of the filters work well together.  However, we
     // can't add it at the very end, because the connected channel filter
     // must be the last one.  So we add it right before the last one.
     grpc_channel_stack_builder_iterator* it =
         grpc_channel_stack_builder_create_iterator_at_last(builder);
     GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
     const bool retval = grpc_channel_stack_builder_add_filter_before(
         it, &test_filter, nullptr, nullptr);
     grpc_channel_stack_builder_iterator_destroy(it);
     return retval;
   } else {
     return true;
   }
 }

 static bool maybe_add_client_subchannel_filter(
     grpc_channel_stack_builder* builder, void* arg) {
   if (g_enable_client_subchannel_filter) {
     // Want to add the filter as close to the end as possible, to make
     // sure that all of the filters work well together.  However, we
     // can't add it at the very end, because the client channel filter
     // must be the last one.  So we add it right before the last one.
     grpc_channel_stack_builder_iterator* it =
         grpc_channel_stack_builder_create_iterator_at_last(builder);
     GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
     const bool retval = grpc_channel_stack_builder_add_filter_before(
         it, &test_filter, nullptr, nullptr);
     grpc_channel_stack_builder_iterator_destroy(it);
     return retval;
   } else {
     return true;
   }
 }

 static void init_plugin(void) {
   grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
                                    maybe_add_server_channel_filter, nullptr);
   grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX,
                                    maybe_add_client_channel_filter, nullptr);
   grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL, INT_MAX,
                                    maybe_add_client_subchannel_filter, nullptr);
   grpc_channel_init_register_stage(GRPC_CLIENT_DIRECT_CHANNEL, INT_MAX,
                                    maybe_add_client_channel_filter, nullptr);
 }

 static void destroy_plugin(void) {}

 void filter_call_init_fails(grpc_end2end_test_config config) {
   gpr_log(GPR_INFO, "Testing SERVER_CHANNEL filter.");
   g_enable_server_channel_filter = true;
   test_server_channel_filter(config);
   g_enable_server_channel_filter = false;
   gpr_log(GPR_INFO, "Testing CLIENT_CHANNEL / CLIENT_DIRECT_CHANNEL filter.");
   g_enable_client_channel_filter = true;
   test_client_channel_filter(config);
   g_enable_client_channel_filter = false;
   if (config.feature_mask & FEATURE_MASK_SUPPORTS_CLIENT_CHANNEL) {
     gpr_log(GPR_INFO, "Testing CLIENT_SUBCHANNEL filter.");
     g_enable_client_subchannel_filter = true;
     test_client_subchannel_filter(config);
     g_enable_client_subchannel_filter = false;
   }
 }

 void filter_call_init_fails_pre_init(void) {
   grpc_register_plugin(init_plugin, destroy_plugin);
 }
	/*
	*
	* Copyright 2016 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 <limits.h>
	#include <stdbool.h>
	#include <stdio.h>
	#include <string.h>

	#include <grpc/byte_buffer.h>
	#include <grpc/support/alloc.h>
	#include <grpc/support/log.h>
	#include <grpc/support/time.h>
	#include <grpc/support/useful.h>
	#include "src/core/lib/channel/channel_stack_builder.h"
	#include "src/core/lib/surface/channel_init.h"
	#include "test/core/end2end/cq_verifier.h"

	enum { TIMEOUT = 200000 };

	static bool g_enable_server_channel_filter = false;
	static bool g_enable_client_channel_filter = false;
	static bool g_enable_client_subchannel_filter = false;

	static void* tag(intptr_t t) { return (void*)t; }

	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(void) {
	return n_seconds_from_now(5);
	}

	static void drain_cq(grpc_completion_queue* cq) {
	grpc_event ev;
	do {
	ev = grpc_completion_queue_next(cq, five_seconds_from_now(), nullptr);
	} while (ev.type != GRPC_QUEUE_SHUTDOWN);
	}

	static void shutdown_server(grpc_end2end_test_fixture* f) {
	if (!f->server) return;
	grpc_server_shutdown_and_notify(f->server, f->shutdown_cq, tag(1000));
	GPR_ASSERT(grpc_completion_queue_pluck(f->shutdown_cq, tag(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);
	}

	// Simple request via a SERVER_CHANNEL filter that always fails to
	// initialize the call.
	static void test_server_channel_filter(grpc_end2end_test_config config) {
	grpc_call* c;
	grpc_call* s;
	grpc_slice request_payload_slice =
	grpc_slice_from_copied_string("hello world");
	grpc_byte_buffer* request_payload =
	grpc_raw_byte_buffer_create(&request_payload_slice, 1);
	grpc_end2end_test_fixture f =
	begin_test(config, "filter_call_init_fails", nullptr, nullptr);
	cq_verifier* cqv = cq_verifier_create(f.cq);
	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_byte_buffer* request_payload_recv = nullptr;
	grpc_call_details call_details;
	grpc_status_code status;
	grpc_call_error error;
	grpc_slice details;

	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"),
	get_host_override_slice("foo.test.google.fr:1234", config), deadline,
	nullptr);
	GPR_ASSERT(c);

	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->data.send_initial_metadata.metadata = nullptr;
	op->flags = 0;
	op->reserved = nullptr;
	op++;
	op->op = GRPC_OP_SEND_MESSAGE;
	op->data.send_message.send_message = request_payload;
	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->flags = 0;
	op->reserved = nullptr;
	op++;
	error = grpc_call_start_batch(c, ops, (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(101));
	GPR_ASSERT(GRPC_CALL_OK == error);

	CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
	cq_verify(cqv);

	GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
	GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

	grpc_slice_unref(details);
	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);

	cq_verifier_destroy(cqv);

	grpc_byte_buffer_destroy(request_payload);
	grpc_byte_buffer_destroy(request_payload_recv);

	end_test(&f);
	config.tear_down_data(&f);
	}

	// Simple request via a CLIENT_CHANNEL or CLIENT_DIRECT_CHANNEL filter
	// that always fails to initialize the call.
	static void test_client_channel_filter(grpc_end2end_test_config config) {
	grpc_call* c;
	grpc_slice request_payload_slice =
	grpc_slice_from_copied_string("hello world");
	grpc_byte_buffer* request_payload =
	grpc_raw_byte_buffer_create(&request_payload_slice, 1);
	gpr_timespec deadline = five_seconds_from_now();
	grpc_end2end_test_fixture f =
	begin_test(config, "filter_call_init_fails", nullptr, nullptr);
	cq_verifier* cqv = cq_verifier_create(f.cq);
	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_byte_buffer* request_payload_recv = nullptr;
	grpc_call_details call_details;
	grpc_status_code status;
	grpc_call_error error;
	grpc_slice details;

	c = grpc_channel_create_call(
	f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
	grpc_slice_from_static_string("/foo"),
	get_host_override_slice("foo.test.google.fr:1234", config), deadline,
	nullptr);
	GPR_ASSERT(c);

	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->data.send_initial_metadata.metadata = nullptr;
	op->flags = 0;
	op->reserved = nullptr;
	op++;
	op->op = GRPC_OP_SEND_MESSAGE;
	op->data.send_message.send_message = request_payload;
	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->flags = 0;
	op->reserved = nullptr;
	op++;
	error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
	cq_verify(cqv);

	GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
	GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

	grpc_slice_unref(details);
	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);

	cq_verifier_destroy(cqv);

	grpc_byte_buffer_destroy(request_payload);
	grpc_byte_buffer_destroy(request_payload_recv);

	end_test(&f);
	config.tear_down_data(&f);
	}

	// Simple request via a CLIENT_SUBCHANNEL filter that always fails to
	// initialize the call.
	static void test_client_subchannel_filter(grpc_end2end_test_config config) {
	grpc_call* c;
	grpc_slice request_payload_slice =
	grpc_slice_from_copied_string("hello world");
	grpc_byte_buffer* request_payload =
	grpc_raw_byte_buffer_create(&request_payload_slice, 1);
	gpr_timespec deadline = five_seconds_from_now();
	grpc_end2end_test_fixture f =
	begin_test(config, "filter_call_init_fails", nullptr, nullptr);
	cq_verifier* cqv = cq_verifier_create(f.cq);
	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_byte_buffer* request_payload_recv = nullptr;
	grpc_call_details call_details;
	grpc_status_code status;
	grpc_call_error error;
	grpc_slice details;

	c = grpc_channel_create_call(
	f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
	grpc_slice_from_static_string("/foo"),
	get_host_override_slice("foo.test.google.fr:1234", config), deadline,
	nullptr);
	GPR_ASSERT(c);

	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->data.send_initial_metadata.metadata = nullptr;
	op->flags = 0;
	op->reserved = nullptr;
	op++;
	op->op = GRPC_OP_SEND_MESSAGE;
	op->data.send_message.send_message = request_payload;
	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->flags = 0;
	op->reserved = nullptr;
	op++;

	error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
	cq_verify(cqv);

	GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
	GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

	// Reset and create a new call. (The first call uses a different code
	// path in client_channel.c than subsequent calls on the same channel,
	// and we need to test both.)
	grpc_call_unref(c);
	status = GRPC_STATUS_OK;
	grpc_slice_unref(details);
	details = grpc_empty_slice();

	c = grpc_channel_create_call(
	f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
	grpc_slice_from_static_string("/foo"),
	get_host_override_slice("foo.test.google.fr:1234", config), deadline,
	nullptr);
	GPR_ASSERT(c);

	error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(2), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	CQ_EXPECT_COMPLETION(cqv, tag(2), 1);
	cq_verify(cqv);

	GPR_ASSERT(status == GRPC_STATUS_PERMISSION_DENIED);
	GPR_ASSERT(0 == grpc_slice_str_cmp(details, "access denied"));

	grpc_slice_unref(details);
	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);

	cq_verifier_destroy(cqv);

	grpc_byte_buffer_destroy(request_payload);
	grpc_byte_buffer_destroy(request_payload_recv);

	end_test(&f);
	config.tear_down_data(&f);
	}

	/*******************************************************************************
	* Test filter - always fails to initialize a call
	*/

	static grpc_error* init_call_elem(grpc_call_element* elem,
	const grpc_call_element_args* args) {
	return grpc_error_set_int(
	GRPC_ERROR_CREATE_FROM_STATIC_STRING("access denied"),
	GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_PERMISSION_DENIED);
	}

	static void destroy_call_elem(grpc_call_element* elem,
	const grpc_call_final_info* final_info,
	grpc_closure* ignored) {}

	static grpc_error* init_channel_elem(grpc_channel_element* elem,
	grpc_channel_element_args* args) {
	return GRPC_ERROR_NONE;
	}

	static void destroy_channel_elem(grpc_channel_element* elem) {}

	static const grpc_channel_filter test_filter = {
	grpc_call_next_op,
	grpc_channel_next_op,
	0,
	init_call_elem,
	grpc_call_stack_ignore_set_pollset_or_pollset_set,
	destroy_call_elem,
	0,
	init_channel_elem,
	destroy_channel_elem,
	grpc_channel_next_get_info,
	"filter_call_init_fails"};

	/*******************************************************************************
	* Registration
	*/

	static bool maybe_add_server_channel_filter(grpc_channel_stack_builder* builder,
	void* arg) {
	if (g_enable_server_channel_filter) {
	// Want to add the filter as close to the end as possible, to make
	// sure that all of the filters work well together. However, we
	// can't add it at the very end, because the connected channel filter
	// must be the last one. So we add it right before the last one.
	grpc_channel_stack_builder_iterator* it =
	grpc_channel_stack_builder_create_iterator_at_last(builder);
	GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
	const bool retval = grpc_channel_stack_builder_add_filter_before(
	it, &test_filter, nullptr, nullptr);
	grpc_channel_stack_builder_iterator_destroy(it);
	return retval;
	} else {
	return true;
	}
	}

	static bool maybe_add_client_channel_filter(grpc_channel_stack_builder* builder,
	void* arg) {
	if (g_enable_client_channel_filter) {
	// Want to add the filter as close to the end as possible, to make
	// sure that all of the filters work well together. However, we
	// can't add it at the very end, because the connected channel filter
	// must be the last one. So we add it right before the last one.
	grpc_channel_stack_builder_iterator* it =
	grpc_channel_stack_builder_create_iterator_at_last(builder);
	GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
	const bool retval = grpc_channel_stack_builder_add_filter_before(
	it, &test_filter, nullptr, nullptr);
	grpc_channel_stack_builder_iterator_destroy(it);
	return retval;
	} else {
	return true;
	}
	}

	static bool maybe_add_client_subchannel_filter(
	grpc_channel_stack_builder* builder, void* arg) {
	if (g_enable_client_subchannel_filter) {
	// Want to add the filter as close to the end as possible, to make
	// sure that all of the filters work well together. However, we
	// can't add it at the very end, because the client channel filter
	// must be the last one. So we add it right before the last one.
	grpc_channel_stack_builder_iterator* it =
	grpc_channel_stack_builder_create_iterator_at_last(builder);
	GPR_ASSERT(grpc_channel_stack_builder_move_prev(it));
	const bool retval = grpc_channel_stack_builder_add_filter_before(
	it, &test_filter, nullptr, nullptr);
	grpc_channel_stack_builder_iterator_destroy(it);
	return retval;
	} else {
	return true;
	}
	}

	static void init_plugin(void) {
	grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
	maybe_add_server_channel_filter, nullptr);
	grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX,
	maybe_add_client_channel_filter, nullptr);
	grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL, INT_MAX,
	maybe_add_client_subchannel_filter, nullptr);
	grpc_channel_init_register_stage(GRPC_CLIENT_DIRECT_CHANNEL, INT_MAX,
	maybe_add_client_channel_filter, nullptr);
	}

	static void destroy_plugin(void) {}

	void filter_call_init_fails(grpc_end2end_test_config config) {
	gpr_log(GPR_INFO, "Testing SERVER_CHANNEL filter.");
	g_enable_server_channel_filter = true;
	test_server_channel_filter(config);
	g_enable_server_channel_filter = false;
	gpr_log(GPR_INFO, "Testing CLIENT_CHANNEL / CLIENT_DIRECT_CHANNEL filter.");
	g_enable_client_channel_filter = true;
	test_client_channel_filter(config);
	g_enable_client_channel_filter = false;
	if (config.feature_mask & FEATURE_MASK_SUPPORTS_CLIENT_CHANNEL) {
	gpr_log(GPR_INFO, "Testing CLIENT_SUBCHANNEL filter.");
	g_enable_client_subchannel_filter = true;
	test_client_subchannel_filter(config);
	g_enable_client_subchannel_filter = false;
	}
	}

	void filter_call_init_fails_pre_init(void) {
	grpc_register_plugin(init_plugin, destroy_plugin);
	}