test/core/end2end/tests/resource_quota_server.c - platform/external/grpc-grpc - Gitiles

 /*
  *
  * Copyright 2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #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, "%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, NULL);
   return f;
 }

 static gpr_timespec n_seconds_time(int n) {
   return GRPC_TIMEOUT_SECONDS_TO_DEADLINE(n);
 }

 static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }

 static void drain_cq(grpc_completion_queue *cq) {
   grpc_event ev;
   do {
     ev = grpc_completion_queue_next(cq, five_seconds_time(), NULL);
   } 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->cq, tag(1000));
   GPR_ASSERT(grpc_completion_queue_pluck(
                  f->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
                  .type == GRPC_OP_COMPLETE);
   grpc_server_destroy(f->server);
   f->server = NULL;
 }

 static void shutdown_client(grpc_end2end_test_fixture *f) {
   if (!f->client) return;
   grpc_channel_destroy(f->client);
   f->client = NULL;
 }

 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);
 }

 /* 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[1024 * 1024];
   for (i = 0; i < GPR_ARRAY_SIZE(output) - 1; ++i) {
     output[i] = chars[rand() % (int)(sizeof(chars) - 1)];
   }
   output[GPR_ARRAY_SIZE(output) - 1] = '\0';
   return grpc_slice_from_copied_string(output);
 }

 void resource_quota_server(grpc_end2end_test_config config) {
   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 1000
 #define SERVER_START_BASE_TAG 2000
 #define SERVER_RECV_BASE_TAG 3000
 #define SERVER_END_BASE_TAG 4000

   grpc_arg arg;
   arg.key = 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", NULL, &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[NUM_CALLS];
   grpc_call *server_calls[NUM_CALLS];
   grpc_metadata_array initial_metadata_recv[NUM_CALLS];
   grpc_metadata_array trailing_metadata_recv[NUM_CALLS];
   grpc_metadata_array request_metadata_recv[NUM_CALLS];
   grpc_call_details call_details[NUM_CALLS];
   grpc_status_code status[NUM_CALLS];
   char *details[NUM_CALLS];
   size_t details_capacity[NUM_CALLS];
   grpc_byte_buffer *request_payload_recv[NUM_CALLS];
   int was_cancelled[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;

   grpc_byte_buffer *request_payload =
       grpc_raw_byte_buffer_create(&request_payload_slice, 1);

   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]);
     details[i] = NULL;
     details_capacity[i] = 0;
     request_payload_recv[i] = NULL;
     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, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq, "/foo",
         "foo.test.google.fr", n_seconds_time(60), NULL);

     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 = NULL;
     op++;
     op->op = GRPC_OP_SEND_MESSAGE;
     op->data.send_message = request_payload;
     op->flags = 0;
     op->reserved = NULL;
     op++;
     op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
     op->flags = 0;
     op->reserved = NULL;
     op++;
     op->op = GRPC_OP_RECV_INITIAL_METADATA;
     op->data.recv_initial_metadata = &initial_metadata_recv[i];
     op->flags = 0;
     op->reserved = NULL;
     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->data.recv_status_on_client.status_details_capacity =
         &details_capacity[i];
     op->flags = 0;
     op->reserved = NULL;
     op++;
     error = grpc_call_start_batch(client_calls[i], ops, (size_t)(op - ops),
                                   tag(CLIENT_BASE_TAG + i), NULL);
     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_time(10), NULL);
     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_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_destroy(client_calls[call_id]);
       gpr_free(details[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 = NULL;
       op++;
       op->op = GRPC_OP_RECV_MESSAGE;
       op->data.recv_message = &request_payload_recv[call_id];
       op->flags = 0;
       op->reserved = NULL;
       op++;
       error =
           grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
                                 tag(SERVER_RECV_BASE_TAG + call_id), NULL);
       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] != NULL) {
           grpc_byte_buffer_destroy(request_payload_recv[call_id]);
           request_payload_recv[call_id] = NULL;
         }
       } else {
         GPR_ASSERT(request_payload_recv[call_id] == NULL);
       }

       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 = NULL;
       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;
       op->data.send_status_from_server.status_details = "xyz";
       op->flags = 0;
       op->reserved = NULL;
       op++;
       error =
           grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
                                 tag(SERVER_END_BASE_TAG + call_id), NULL);
       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_destroy(server_calls[call_id]);
     }
   }

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

   /* The server call may be cancelled after it's received it's status, but
    * before the client does: this means that we should see strictly more
    * failures on the client than on the server */
   GPR_ASSERT(cancelled_calls_on_client >= cancelled_calls_on_server);
   /* However, we shouldn't see radically more... 0.9 is a guessed bound on what
    * we'd want that ratio to be... to at least trigger some investigation should
    * that ratio become much higher. */
   GPR_ASSERT(cancelled_calls_on_server >= 0.9 * cancelled_calls_on_client);

   grpc_byte_buffer_destroy(request_payload);
   grpc_slice_unref(request_payload_slice);
   grpc_resource_quota_unref(resource_quota);

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

 void resource_quota_server_pre_init(void) {}
	/*
	*
	* Copyright 2016, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#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, "%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, NULL);
	return f;
	}

	static gpr_timespec n_seconds_time(int n) {
	return GRPC_TIMEOUT_SECONDS_TO_DEADLINE(n);
	}

	static gpr_timespec five_seconds_time(void) { return n_seconds_time(5); }

	static void drain_cq(grpc_completion_queue *cq) {
	grpc_event ev;
	do {
	ev = grpc_completion_queue_next(cq, five_seconds_time(), NULL);
	} 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->cq, tag(1000));
	GPR_ASSERT(grpc_completion_queue_pluck(
	f->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL)
	.type == GRPC_OP_COMPLETE);
	grpc_server_destroy(f->server);
	f->server = NULL;
	}

	static void shutdown_client(grpc_end2end_test_fixture *f) {
	if (!f->client) return;
	grpc_channel_destroy(f->client);
	f->client = NULL;
	}

	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);
	}

	/* 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[1024 * 1024];
	for (i = 0; i < GPR_ARRAY_SIZE(output) - 1; ++i) {
	output[i] = chars[rand() % (int)(sizeof(chars) - 1)];
	}
	output[GPR_ARRAY_SIZE(output) - 1] = '\0';
	return grpc_slice_from_copied_string(output);
	}

	void resource_quota_server(grpc_end2end_test_config config) {
	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 1000
	#define SERVER_START_BASE_TAG 2000
	#define SERVER_RECV_BASE_TAG 3000
	#define SERVER_END_BASE_TAG 4000

	grpc_arg arg;
	arg.key = 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", NULL, &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[NUM_CALLS];
	grpc_call *server_calls[NUM_CALLS];
	grpc_metadata_array initial_metadata_recv[NUM_CALLS];
	grpc_metadata_array trailing_metadata_recv[NUM_CALLS];
	grpc_metadata_array request_metadata_recv[NUM_CALLS];
	grpc_call_details call_details[NUM_CALLS];
	grpc_status_code status[NUM_CALLS];
	char *details[NUM_CALLS];
	size_t details_capacity[NUM_CALLS];
	grpc_byte_buffer *request_payload_recv[NUM_CALLS];
	int was_cancelled[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;

	grpc_byte_buffer *request_payload =
	grpc_raw_byte_buffer_create(&request_payload_slice, 1);

	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]);
	details[i] = NULL;
	details_capacity[i] = 0;
	request_payload_recv[i] = NULL;
	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, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq, "/foo",
	"foo.test.google.fr", n_seconds_time(60), NULL);

	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 = NULL;
	op++;
	op->op = GRPC_OP_SEND_MESSAGE;
	op->data.send_message = request_payload;
	op->flags = 0;
	op->reserved = NULL;
	op++;
	op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
	op->flags = 0;
	op->reserved = NULL;
	op++;
	op->op = GRPC_OP_RECV_INITIAL_METADATA;
	op->data.recv_initial_metadata = &initial_metadata_recv[i];
	op->flags = 0;
	op->reserved = NULL;
	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->data.recv_status_on_client.status_details_capacity =
	&details_capacity[i];
	op->flags = 0;
	op->reserved = NULL;
	op++;
	error = grpc_call_start_batch(client_calls[i], ops, (size_t)(op - ops),
	tag(CLIENT_BASE_TAG + i), NULL);
	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_time(10), NULL);
	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_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_destroy(client_calls[call_id]);
	gpr_free(details[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 = NULL;
	op++;
	op->op = GRPC_OP_RECV_MESSAGE;
	op->data.recv_message = &request_payload_recv[call_id];
	op->flags = 0;
	op->reserved = NULL;
	op++;
	error =
	grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
	tag(SERVER_RECV_BASE_TAG + call_id), NULL);
	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] != NULL) {
	grpc_byte_buffer_destroy(request_payload_recv[call_id]);
	request_payload_recv[call_id] = NULL;
	}
	} else {
	GPR_ASSERT(request_payload_recv[call_id] == NULL);
	}

	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 = NULL;
	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;
	op->data.send_status_from_server.status_details = "xyz";
	op->flags = 0;
	op->reserved = NULL;
	op++;
	error =
	grpc_call_start_batch(server_calls[call_id], ops, (size_t)(op - ops),
	tag(SERVER_END_BASE_TAG + call_id), NULL);
	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_destroy(server_calls[call_id]);
	}
	}

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

	/* The server call may be cancelled after it's received it's status, but
	* before the client does: this means that we should see strictly more
	* failures on the client than on the server */
	GPR_ASSERT(cancelled_calls_on_client >= cancelled_calls_on_server);
	/* However, we shouldn't see radically more... 0.9 is a guessed bound on what
	* we'd want that ratio to be... to at least trigger some investigation should
	* that ratio become much higher. */
	GPR_ASSERT(cancelled_calls_on_server >= 0.9 * cancelled_calls_on_client);

	grpc_byte_buffer_destroy(request_payload);
	grpc_slice_unref(request_payload_slice);
	grpc_resource_quota_unref(resource_quota);

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

	void resource_quota_server_pre_init(void) {}