test/core/end2end/tests/resource_quota_server.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 <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 "test/core/end2end/cq_verifier.h"

 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);
 }

 /* Creates and returns a grpc_slice containing random alphanumeric characters.
  */
 static grpc_slice generate_random_slice() {
   size_t i;
   static const char chars[] = "abcdefghijklmnopqrstuvwxyz1234567890";
   char* output;
   const size_t output_size = 1024 * 1024;
   output = (char*)gpr_malloc(output_size);
   for (i = 0; i < output_size - 1; ++i) {
     output[i] = chars[rand() % (int)(sizeof(chars) - 1)];
   }
   output[output_size - 1] = '\0';
   grpc_slice out = grpc_slice_from_copied_string(output);
   gpr_free(output);
   return out;
 }

 void resource_quota_server(grpc_end2end_test_config config) {
   if (config.feature_mask &
       FEATURE_MASK_DOES_NOT_SUPPORT_RESOURCE_QUOTA_SERVER) {
     return;
   }
   grpc_resource_quota* resource_quota =
       grpc_resource_quota_create("test_server");
   grpc_resource_quota_resize(resource_quota, 5 * 1024 * 1024);

 #define NUM_CALLS 100
 #define CLIENT_BASE_TAG 0x1000
 #define SERVER_START_BASE_TAG 0x2000
 #define SERVER_RECV_BASE_TAG 0x3000
 #define SERVER_END_BASE_TAG 0x4000

   grpc_arg arg;
   arg.key = const_cast<char*>(GRPC_ARG_RESOURCE_QUOTA);
   arg.type = GRPC_ARG_POINTER;
   arg.value.pointer.p = resource_quota;
   arg.value.pointer.vtable = grpc_resource_quota_arg_vtable();
   grpc_channel_args args = {1, &arg};

   grpc_end2end_test_fixture f =
       begin_test(config, "resource_quota_server", nullptr, &args);

   /* Create large request and response bodies. These are big enough to require
    * multiple round trips to deliver to the peer, and their exact contents of
    * will be verified on completion. */
   grpc_slice request_payload_slice = generate_random_slice();

   grpc_call** client_calls =
       (grpc_call**)malloc(sizeof(grpc_call*) * NUM_CALLS);
   grpc_call** server_calls =
       (grpc_call**)malloc(sizeof(grpc_call*) * NUM_CALLS);
   grpc_metadata_array* initial_metadata_recv =
       (grpc_metadata_array*)malloc(sizeof(grpc_metadata_array) * NUM_CALLS);
   grpc_metadata_array* trailing_metadata_recv =
       (grpc_metadata_array*)malloc(sizeof(grpc_metadata_array) * NUM_CALLS);
   grpc_metadata_array* request_metadata_recv =
       (grpc_metadata_array*)malloc(sizeof(grpc_metadata_array) * NUM_CALLS);
   grpc_call_details* call_details =
       (grpc_call_details*)malloc(sizeof(grpc_call_details) * NUM_CALLS);
   grpc_status_code* status =
       (grpc_status_code*)malloc(sizeof(grpc_status_code) * NUM_CALLS);
   grpc_slice* details = (grpc_slice*)malloc(sizeof(grpc_slice) * NUM_CALLS);
   grpc_byte_buffer** request_payload =
       (grpc_byte_buffer**)malloc(sizeof(grpc_byte_buffer*) * NUM_CALLS);
   grpc_byte_buffer** request_payload_recv =
       (grpc_byte_buffer**)malloc(sizeof(grpc_byte_buffer*) * NUM_CALLS);
   int* was_cancelled = (int*)malloc(sizeof(int) * NUM_CALLS);
   grpc_call_error error;
   int pending_client_calls = 0;
   int pending_server_start_calls = 0;
   int pending_server_recv_calls = 0;
   int pending_server_end_calls = 0;
   int cancelled_calls_on_client = 0;
   int cancelled_calls_on_server = 0;
   int deadline_exceeded = 0;
   int unavailable = 0;

   grpc_op ops[6];
   grpc_op* op;

   for (int i = 0; i < NUM_CALLS; i++) {
     grpc_metadata_array_init(&initial_metadata_recv[i]);
     grpc_metadata_array_init(&trailing_metadata_recv[i]);
     grpc_metadata_array_init(&request_metadata_recv[i]);
     grpc_call_details_init(&call_details[i]);
     request_payload[i] = grpc_raw_byte_buffer_create(&request_payload_slice, 1);
     request_payload_recv[i] = nullptr;
     was_cancelled[i] = 0;
   }

   for (int i = 0; i < NUM_CALLS; i++) {
     error = grpc_server_request_call(
         f.server, &server_calls[i], &call_details[i], &request_metadata_recv[i],
         f.cq, f.cq, tag(SERVER_START_BASE_TAG + i));
     GPR_ASSERT(GRPC_CALL_OK == error);

     pending_server_start_calls++;
   }

   for (int i = 0; i < NUM_CALLS; i++) {
     client_calls[i] = 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", config),
         n_seconds_from_now(60), nullptr);

     memset(ops, 0, sizeof(ops));
     op = ops;
     op->op = GRPC_OP_SEND_INITIAL_METADATA;
     op->data.send_initial_metadata.count = 0;
     op->flags = GRPC_INITIAL_METADATA_WAIT_FOR_READY;
     op->reserved = nullptr;
     op++;
     op->op = GRPC_OP_SEND_MESSAGE;
     op->data.send_message.send_message = request_payload[i];
     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[i];
     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[i];
     op->data.recv_status_on_client.status = &status[i];
     op->data.recv_status_on_client.status_details = &details[i];
     op->flags = 0;
     op->reserved = nullptr;
     op++;
     error = grpc_call_start_batch(client_calls[i], ops, (size_t)(op - ops),
                                   tag(CLIENT_BASE_TAG + i), nullptr);
     GPR_ASSERT(GRPC_CALL_OK == error);

     pending_client_calls++;
   }

   while (pending_client_calls + pending_server_recv_calls +
              pending_server_end_calls >
          0) {
     grpc_event ev =
         grpc_completion_queue_next(f.cq, n_seconds_from_now(60), nullptr);
     GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);

     int ev_tag = (int)(intptr_t)ev.tag;
     if (ev_tag < CLIENT_BASE_TAG) {
       abort(); /* illegal tag */
     } else if (ev_tag < SERVER_START_BASE_TAG) {
       /* client call finished */
       int call_id = ev_tag - CLIENT_BASE_TAG;
       GPR_ASSERT(call_id >= 0);
       GPR_ASSERT(call_id < NUM_CALLS);
       switch (status[call_id]) {
         case GRPC_STATUS_RESOURCE_EXHAUSTED:
           cancelled_calls_on_client++;
           break;
         case GRPC_STATUS_DEADLINE_EXCEEDED:
           deadline_exceeded++;
           break;
         case GRPC_STATUS_UNAVAILABLE:
           unavailable++;
           break;
         case GRPC_STATUS_OK:
           break;
         default:
           gpr_log(GPR_ERROR, "Unexpected status code: %d", status[call_id]);
           abort();
       }
       GPR_ASSERT(pending_client_calls > 0);

       grpc_metadata_array_destroy(&initial_metadata_recv[call_id]);
       grpc_metadata_array_destroy(&trailing_metadata_recv[call_id]);
       grpc_call_unref(client_calls[call_id]);
       grpc_slice_unref(details[call_id]);
       grpc_byte_buffer_destroy(request_payload[call_id]);

       pending_client_calls--;
     } else if (ev_tag < SERVER_RECV_BASE_TAG) {
       /* new incoming call to the server */
       int call_id = ev_tag - SERVER_START_BASE_TAG;
       GPR_ASSERT(call_id >= 0);
       GPR_ASSERT(call_id < NUM_CALLS);

       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_RECV_MESSAGE;
       op->data.recv_message.recv_message = &request_payload_recv[call_id];
       op->flags = 0;
       op->reserved = nullptr;
       op++;
       error =
           grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
                                 tag(SERVER_RECV_BASE_TAG + call_id), nullptr);
       GPR_ASSERT(GRPC_CALL_OK == error);

       GPR_ASSERT(pending_server_start_calls > 0);
       pending_server_start_calls--;
       pending_server_recv_calls++;

       grpc_call_details_destroy(&call_details[call_id]);
       grpc_metadata_array_destroy(&request_metadata_recv[call_id]);
     } else if (ev_tag < SERVER_END_BASE_TAG) {
       /* finished read on the server */
       int call_id = ev_tag - SERVER_RECV_BASE_TAG;
       GPR_ASSERT(call_id >= 0);
       GPR_ASSERT(call_id < NUM_CALLS);

       if (ev.success) {
         if (request_payload_recv[call_id] != nullptr) {
           grpc_byte_buffer_destroy(request_payload_recv[call_id]);
           request_payload_recv[call_id] = nullptr;
         }
       } else {
         GPR_ASSERT(request_payload_recv[call_id] == nullptr);
       }

       memset(ops, 0, sizeof(ops));
       op = ops;
       op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
       op->data.recv_close_on_server.cancelled = &was_cancelled[call_id];
       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_OK;
       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++;
       error =
           grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
                                 tag(SERVER_END_BASE_TAG + call_id), nullptr);
       GPR_ASSERT(GRPC_CALL_OK == error);

       GPR_ASSERT(pending_server_recv_calls > 0);
       pending_server_recv_calls--;
       pending_server_end_calls++;
     } else {
       int call_id = ev_tag - SERVER_END_BASE_TAG;
       GPR_ASSERT(call_id >= 0);
       GPR_ASSERT(call_id < NUM_CALLS);

       if (was_cancelled[call_id]) {
         cancelled_calls_on_server++;
       }
       GPR_ASSERT(pending_server_end_calls > 0);
       pending_server_end_calls--;

       grpc_call_unref(server_calls[call_id]);
     }
   }

   gpr_log(GPR_INFO,
           "Done. %d total calls: %d cancelled at server, %d cancelled at "
           "client, %d timed out, %d unavailable.",
           NUM_CALLS, cancelled_calls_on_server, cancelled_calls_on_client,
           deadline_exceeded, unavailable);

   grpc_slice_unref(request_payload_slice);
   grpc_resource_quota_unref(resource_quota);

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

   free(client_calls);
   free(server_calls);
   free(initial_metadata_recv);
   free(trailing_metadata_recv);
   free(request_metadata_recv);
   free(call_details);
   free(status);
   free(details);
   free(request_payload);
   free(request_payload_recv);
   free(was_cancelled);
 }

 void resource_quota_server_pre_init(void) {}
	/*
	*
	* 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 <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 "test/core/end2end/cq_verifier.h"

	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);
	}

	/* Creates and returns a grpc_slice containing random alphanumeric characters.
	*/
	static grpc_slice generate_random_slice() {
	size_t i;
	static const char chars[] = "abcdefghijklmnopqrstuvwxyz1234567890";
	char* output;
	const size_t output_size = 1024 * 1024;
	output = (char*)gpr_malloc(output_size);
	for (i = 0; i < output_size - 1; ++i) {
	output[i] = chars[rand() % (int)(sizeof(chars) - 1)];
	}
	output[output_size - 1] = '\0';
	grpc_slice out = grpc_slice_from_copied_string(output);
	gpr_free(output);
	return out;
	}

	void resource_quota_server(grpc_end2end_test_config config) {
	if (config.feature_mask &
	FEATURE_MASK_DOES_NOT_SUPPORT_RESOURCE_QUOTA_SERVER) {
	return;
	}
	grpc_resource_quota* resource_quota =
	grpc_resource_quota_create("test_server");
	grpc_resource_quota_resize(resource_quota, 5 * 1024 * 1024);

	#define NUM_CALLS 100
	#define CLIENT_BASE_TAG 0x1000
	#define SERVER_START_BASE_TAG 0x2000
	#define SERVER_RECV_BASE_TAG 0x3000
	#define SERVER_END_BASE_TAG 0x4000

	grpc_arg arg;
	arg.key = const_cast<char*>(GRPC_ARG_RESOURCE_QUOTA);
	arg.type = GRPC_ARG_POINTER;
	arg.value.pointer.p = resource_quota;
	arg.value.pointer.vtable = grpc_resource_quota_arg_vtable();
	grpc_channel_args args = {1, &arg};

	grpc_end2end_test_fixture f =
	begin_test(config, "resource_quota_server", nullptr, &args);

	/* Create large request and response bodies. These are big enough to require
	* multiple round trips to deliver to the peer, and their exact contents of
	* will be verified on completion. */
	grpc_slice request_payload_slice = generate_random_slice();

	grpc_call** client_calls =
	(grpc_call*)malloc(sizeof(grpc_call) * NUM_CALLS);
	grpc_call** server_calls =
	(grpc_call*)malloc(sizeof(grpc_call) * NUM_CALLS);
	grpc_metadata_array* initial_metadata_recv =
	(grpc_metadata_array)malloc(sizeof(grpc_metadata_array) NUM_CALLS);
	grpc_metadata_array* trailing_metadata_recv =
	(grpc_metadata_array)malloc(sizeof(grpc_metadata_array) NUM_CALLS);
	grpc_metadata_array* request_metadata_recv =
	(grpc_metadata_array)malloc(sizeof(grpc_metadata_array) NUM_CALLS);
	grpc_call_details* call_details =
	(grpc_call_details)malloc(sizeof(grpc_call_details) NUM_CALLS);
	grpc_status_code* status =
	(grpc_status_code)malloc(sizeof(grpc_status_code) NUM_CALLS);
	grpc_slice* details = (grpc_slice)malloc(sizeof(grpc_slice) NUM_CALLS);
	grpc_byte_buffer** request_payload =
	(grpc_byte_buffer*)malloc(sizeof(grpc_byte_buffer) * NUM_CALLS);
	grpc_byte_buffer** request_payload_recv =
	(grpc_byte_buffer*)malloc(sizeof(grpc_byte_buffer) * NUM_CALLS);
	int* was_cancelled = (int)malloc(sizeof(int) NUM_CALLS);
	grpc_call_error error;
	int pending_client_calls = 0;
	int pending_server_start_calls = 0;
	int pending_server_recv_calls = 0;
	int pending_server_end_calls = 0;
	int cancelled_calls_on_client = 0;
	int cancelled_calls_on_server = 0;
	int deadline_exceeded = 0;
	int unavailable = 0;

	grpc_op ops[6];
	grpc_op* op;

	for (int i = 0; i < NUM_CALLS; i++) {
	grpc_metadata_array_init(&initial_metadata_recv[i]);
	grpc_metadata_array_init(&trailing_metadata_recv[i]);
	grpc_metadata_array_init(&request_metadata_recv[i]);
	grpc_call_details_init(&call_details[i]);
	request_payload[i] = grpc_raw_byte_buffer_create(&request_payload_slice, 1);
	request_payload_recv[i] = nullptr;
	was_cancelled[i] = 0;
	}

	for (int i = 0; i < NUM_CALLS; i++) {
	error = grpc_server_request_call(
	f.server, &server_calls[i], &call_details[i], &request_metadata_recv[i],
	f.cq, f.cq, tag(SERVER_START_BASE_TAG + i));
	GPR_ASSERT(GRPC_CALL_OK == error);

	pending_server_start_calls++;
	}

	for (int i = 0; i < NUM_CALLS; i++) {
	client_calls[i] = 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", config),
	n_seconds_from_now(60), nullptr);

	memset(ops, 0, sizeof(ops));
	op = ops;
	op->op = GRPC_OP_SEND_INITIAL_METADATA;
	op->data.send_initial_metadata.count = 0;
	op->flags = GRPC_INITIAL_METADATA_WAIT_FOR_READY;
	op->reserved = nullptr;
	op++;
	op->op = GRPC_OP_SEND_MESSAGE;
	op->data.send_message.send_message = request_payload[i];
	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[i];
	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[i];
	op->data.recv_status_on_client.status = &status[i];
	op->data.recv_status_on_client.status_details = &details[i];
	op->flags = 0;
	op->reserved = nullptr;
	op++;
	error = grpc_call_start_batch(client_calls[i], ops, (size_t)(op - ops),
	tag(CLIENT_BASE_TAG + i), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	pending_client_calls++;
	}

	while (pending_client_calls + pending_server_recv_calls +
	pending_server_end_calls >
	0) {
	grpc_event ev =
	grpc_completion_queue_next(f.cq, n_seconds_from_now(60), nullptr);
	GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);

	int ev_tag = (int)(intptr_t)ev.tag;
	if (ev_tag < CLIENT_BASE_TAG) {
	abort(); /* illegal tag */
	} else if (ev_tag < SERVER_START_BASE_TAG) {
	/* client call finished */
	int call_id = ev_tag - CLIENT_BASE_TAG;
	GPR_ASSERT(call_id >= 0);
	GPR_ASSERT(call_id < NUM_CALLS);
	switch (status[call_id]) {
	case GRPC_STATUS_RESOURCE_EXHAUSTED:
	cancelled_calls_on_client++;
	break;
	case GRPC_STATUS_DEADLINE_EXCEEDED:
	deadline_exceeded++;
	break;
	case GRPC_STATUS_UNAVAILABLE:
	unavailable++;
	break;
	case GRPC_STATUS_OK:
	break;
	default:
	gpr_log(GPR_ERROR, "Unexpected status code: %d", status[call_id]);
	abort();
	}
	GPR_ASSERT(pending_client_calls > 0);

	grpc_metadata_array_destroy(&initial_metadata_recv[call_id]);
	grpc_metadata_array_destroy(&trailing_metadata_recv[call_id]);
	grpc_call_unref(client_calls[call_id]);
	grpc_slice_unref(details[call_id]);
	grpc_byte_buffer_destroy(request_payload[call_id]);

	pending_client_calls--;
	} else if (ev_tag < SERVER_RECV_BASE_TAG) {
	/* new incoming call to the server */
	int call_id = ev_tag - SERVER_START_BASE_TAG;
	GPR_ASSERT(call_id >= 0);
	GPR_ASSERT(call_id < NUM_CALLS);

	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_RECV_MESSAGE;
	op->data.recv_message.recv_message = &request_payload_recv[call_id];
	op->flags = 0;
	op->reserved = nullptr;
	op++;
	error =
	grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
	tag(SERVER_RECV_BASE_TAG + call_id), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	GPR_ASSERT(pending_server_start_calls > 0);
	pending_server_start_calls--;
	pending_server_recv_calls++;

	grpc_call_details_destroy(&call_details[call_id]);
	grpc_metadata_array_destroy(&request_metadata_recv[call_id]);
	} else if (ev_tag < SERVER_END_BASE_TAG) {
	/* finished read on the server */
	int call_id = ev_tag - SERVER_RECV_BASE_TAG;
	GPR_ASSERT(call_id >= 0);
	GPR_ASSERT(call_id < NUM_CALLS);

	if (ev.success) {
	if (request_payload_recv[call_id] != nullptr) {
	grpc_byte_buffer_destroy(request_payload_recv[call_id]);
	request_payload_recv[call_id] = nullptr;
	}
	} else {
	GPR_ASSERT(request_payload_recv[call_id] == nullptr);
	}

	memset(ops, 0, sizeof(ops));
	op = ops;
	op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
	op->data.recv_close_on_server.cancelled = &was_cancelled[call_id];
	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_OK;
	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++;
	error =
	grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
	tag(SERVER_END_BASE_TAG + call_id), nullptr);
	GPR_ASSERT(GRPC_CALL_OK == error);

	GPR_ASSERT(pending_server_recv_calls > 0);
	pending_server_recv_calls--;
	pending_server_end_calls++;
	} else {
	int call_id = ev_tag - SERVER_END_BASE_TAG;
	GPR_ASSERT(call_id >= 0);
	GPR_ASSERT(call_id < NUM_CALLS);

	if (was_cancelled[call_id]) {
	cancelled_calls_on_server++;
	}
	GPR_ASSERT(pending_server_end_calls > 0);
	pending_server_end_calls--;

	grpc_call_unref(server_calls[call_id]);
	}
	}

	gpr_log(GPR_INFO,
	"Done. %d total calls: %d cancelled at server, %d cancelled at "
	"client, %d timed out, %d unavailable.",
	NUM_CALLS, cancelled_calls_on_server, cancelled_calls_on_client,
	deadline_exceeded, unavailable);

	grpc_slice_unref(request_payload_slice);
	grpc_resource_quota_unref(resource_quota);

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

	free(client_calls);
	free(server_calls);
	free(initial_metadata_recv);
	free(trailing_metadata_recv);
	free(request_metadata_recv);
	free(call_details);
	free(status);
	free(details);
	free(request_payload);
	free(request_payload_recv);
	free(was_cancelled);
	}

	void resource_quota_server_pre_init(void) {}