text: /*
   *
   * Copyright 2015 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(), 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->shutdown_cq, tag(1000));
    GPR_ASSERT(grpc_completion_queue_pluck(f->shutdown_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);
    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;
    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_call_details call_details;
    grpc_status_code status;
    grpc_call_error error;
    grpc_slice details;
    int was_cancelled = 2;
  
    gpr_timespec deadline = five_seconds_from_now();
    c = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/foo"),
        get_host_override_slice("foo.test.google.fr:1234", config), deadline,
        NULL);
    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->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.recv_initial_metadata = &initial_metadata_recv;
    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;
    op->data.recv_status_on_client.status = &status;
    op->data.recv_status_on_client.status_details = &details;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL);
    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(101), 1);
    cq_verify(cqv);
  
    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_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 = NULL;
    op++;
    op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(102), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
    cq_verify(cqv);
  
    GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
    GPR_ASSERT(0 == grpc_slice_str_cmp(details, "xyz"));
    GPR_ASSERT(0 == grpc_slice_str_cmp(call_details.method, "/foo"));
    validate_host_override_string("foo.test.google.fr:1234", call_details.host,
                                  config);
    GPR_ASSERT(was_cancelled == 1);
  
    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);
    grpc_call_unref(s);
  
    cq_verifier_destroy(cqv);
  }
  
  static void test_max_concurrent_streams(grpc_end2end_test_config config) {
    grpc_end2end_test_fixture f;
    grpc_arg server_arg;
    grpc_channel_args server_args;
    grpc_call *c1;
    grpc_call *c2;
    grpc_call *s1;
    grpc_call *s2;
    int live_call;
    gpr_timespec deadline;
    cq_verifier *cqv;
    grpc_event ev;
    grpc_call_details call_details;
    grpc_metadata_array request_metadata_recv;
    grpc_metadata_array initial_metadata_recv1;
    grpc_metadata_array trailing_metadata_recv1;
    grpc_metadata_array initial_metadata_recv2;
    grpc_metadata_array trailing_metadata_recv2;
    grpc_status_code status1;
    grpc_call_error error;
    grpc_slice details1;
    grpc_status_code status2;
    grpc_slice details2;
    grpc_op ops[6];
    grpc_op *op;
    int was_cancelled;
    int got_client_start;
    int got_server_start;
  
    server_arg.key = GRPC_ARG_MAX_CONCURRENT_STREAMS;
    server_arg.type = GRPC_ARG_INTEGER;
    server_arg.value.integer = 1;
  
    server_args.num_args = 1;
    server_args.args = &server_arg;
  
    f = begin_test(config, "test_max_concurrent_streams", NULL, &server_args);
    cqv = cq_verifier_create(f.cq);
  
    grpc_metadata_array_init(&request_metadata_recv);
    grpc_metadata_array_init(&initial_metadata_recv1);
    grpc_metadata_array_init(&trailing_metadata_recv1);
    grpc_metadata_array_init(&initial_metadata_recv2);
    grpc_metadata_array_init(&trailing_metadata_recv2);
    grpc_call_details_init(&call_details);
  
    /* perform a ping-pong to ensure that settings have had a chance to round
       trip */
    simple_request_body(config, f);
    /* perform another one to make sure that the one stream case still works */
    simple_request_body(config, f);
  
    /* start two requests - ensuring that the second is not accepted until
       the first completes */
    deadline = n_seconds_from_now(1000);
    c1 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/alpha"),
        get_host_override_slice("foo.test.google.fr:1234", config), deadline,
        NULL);
    GPR_ASSERT(c1);
    c2 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/beta"),
        get_host_override_slice("foo.test.google.fr:1234", config), deadline,
        NULL);
    GPR_ASSERT(c2);
  
    GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
                                   f.server, &s1, &call_details,
                                   &request_metadata_recv, f.cq, f.cq, tag(101)));
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(301), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv1;
    op->data.recv_status_on_client.status = &status1;
    op->data.recv_status_on_client.status_details = &details1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(302), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(401), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv2;
    op->data.recv_status_on_client.status = &status2;
    op->data.recv_status_on_client.status_details = &details2;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(402), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    got_client_start = 0;
    got_server_start = 0;
    live_call = -1;
    while (!got_client_start || !got_server_start) {
      ev = grpc_completion_queue_next(f.cq, grpc_timeout_seconds_to_deadline(3),
                                      NULL);
      GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
      GPR_ASSERT(ev.success);
      if (ev.tag == tag(101)) {
        GPR_ASSERT(!got_server_start);
        got_server_start = 1;
      } else {
        GPR_ASSERT(!got_client_start);
        GPR_ASSERT(ev.tag == tag(301) || ev.tag == tag(401));
        /* The /alpha or /beta calls started above could be invoked (but NOT
         * both);
         * check this here */
        /* We'll get tag 303 or 403, we want 300, 400 */
        live_call = ((int)(intptr_t)ev.tag) - 1;
        got_client_start = 1;
      }
    }
    GPR_ASSERT(live_call == 300 || live_call == 400);
  
    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_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    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_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 = NULL;
    op++;
    error = grpc_call_start_batch(s1, ops, (size_t)(op - ops), tag(102), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(102), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(live_call + 2), 1);
    /* first request is finished, we should be able to start the second */
    live_call = (live_call == 300) ? 400 : 300;
    CQ_EXPECT_COMPLETION(cqv, tag(live_call + 1), 1);
    cq_verify(cqv);
  
    grpc_call_details_destroy(&call_details);
  
    GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
                                   f.server, &s2, &call_details,
                                   &request_metadata_recv, f.cq, f.cq, tag(201)));
    CQ_EXPECT_COMPLETION(cqv, tag(201), 1);
    cq_verify(cqv);
  
    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_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    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_UNIMPLEMENTED;
    op->data.send_status_from_server.status_details = &status_details;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(s2, ops, (size_t)(op - ops), tag(202), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(live_call + 2), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(202), 1);
    cq_verify(cqv);
  
    cq_verifier_destroy(cqv);
  
    grpc_call_unref(c1);
    grpc_call_unref(s1);
    grpc_call_unref(c2);
    grpc_call_unref(s2);
  
    grpc_slice_unref(details1);
    grpc_slice_unref(details2);
    grpc_metadata_array_destroy(&initial_metadata_recv1);
    grpc_metadata_array_destroy(&trailing_metadata_recv1);
    grpc_metadata_array_destroy(&initial_metadata_recv2);
    grpc_metadata_array_destroy(&trailing_metadata_recv2);
    grpc_metadata_array_destroy(&request_metadata_recv);
    grpc_call_details_destroy(&call_details);
  
    end_test(&f);
    config.tear_down_data(&f);
  }
  
  static void test_max_concurrent_streams_with_timeout_on_first(
      grpc_end2end_test_config config) {
    grpc_end2end_test_fixture f;
    grpc_arg server_arg;
    grpc_channel_args server_args;
    grpc_call *c1;
    grpc_call *c2;
    grpc_call *s1;
    grpc_call *s2;
    cq_verifier *cqv;
    grpc_call_details call_details;
    grpc_metadata_array request_metadata_recv;
    grpc_metadata_array initial_metadata_recv1;
    grpc_metadata_array trailing_metadata_recv1;
    grpc_metadata_array initial_metadata_recv2;
    grpc_metadata_array trailing_metadata_recv2;
    grpc_status_code status1;
    grpc_call_error error;
    grpc_slice details1 = grpc_empty_slice();
    grpc_status_code status2;
    grpc_slice details2 = grpc_empty_slice();
    grpc_op ops[6];
    grpc_op *op;
    int was_cancelled;
  
    server_arg.key = GRPC_ARG_MAX_CONCURRENT_STREAMS;
    server_arg.type = GRPC_ARG_INTEGER;
    server_arg.value.integer = 1;
  
    server_args.num_args = 1;
    server_args.args = &server_arg;
  
    f = begin_test(config, "test_max_concurrent_streams_with_timeout_on_first",
                   NULL, &server_args);
    cqv = cq_verifier_create(f.cq);
  
    grpc_metadata_array_init(&request_metadata_recv);
    grpc_metadata_array_init(&initial_metadata_recv1);
    grpc_metadata_array_init(&trailing_metadata_recv1);
    grpc_metadata_array_init(&initial_metadata_recv2);
    grpc_metadata_array_init(&trailing_metadata_recv2);
    grpc_call_details_init(&call_details);
  
    /* perform a ping-pong to ensure that settings have had a chance to round
       trip */
    simple_request_body(config, f);
    /* perform another one to make sure that the one stream case still works */
    simple_request_body(config, f);
  
    /* start two requests - ensuring that the second is not accepted until
       the first completes */
    c1 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/alpha"),
        get_host_override_slice("foo.test.google.fr:1234", config),
        n_seconds_from_now(3), NULL);
    GPR_ASSERT(c1);
    c2 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/beta"),
        get_host_override_slice("foo.test.google.fr:1234", config),
        n_seconds_from_now(1000), NULL);
    GPR_ASSERT(c2);
  
    GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
                                   f.server, &s1, &call_details,
                                   &request_metadata_recv, f.cq, f.cq, tag(101)));
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(301), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv1;
    op->data.recv_status_on_client.status = &status1;
    op->data.recv_status_on_client.status_details = &details1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(302), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(101), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(301), 1);
    cq_verify(cqv);
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(401), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv2;
    op->data.recv_status_on_client.status = &status2;
    op->data.recv_status_on_client.status_details = &details2;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv2;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(402), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    grpc_call_details_destroy(&call_details);
    grpc_call_details_init(&call_details);
    GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
                                   f.server, &s2, &call_details,
                                   &request_metadata_recv, f.cq, f.cq, tag(201)));
  
    CQ_EXPECT_COMPLETION(cqv, tag(302), 1);
    /* first request is finished, we should be able to start the second */
    CQ_EXPECT_COMPLETION(cqv, tag(401), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(201), 1);
    cq_verify(cqv);
  
    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_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    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_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 = NULL;
    op++;
    error = grpc_call_start_batch(s2, ops, (size_t)(op - ops), tag(202), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(402), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(202), 1);
    cq_verify(cqv);
  
    cq_verifier_destroy(cqv);
  
    grpc_call_unref(c1);
    grpc_call_unref(s1);
    grpc_call_unref(c2);
    grpc_call_unref(s2);
  
    grpc_slice_unref(details1);
    grpc_slice_unref(details2);
    grpc_metadata_array_destroy(&initial_metadata_recv1);
    grpc_metadata_array_destroy(&trailing_metadata_recv1);
    grpc_metadata_array_destroy(&initial_metadata_recv2);
    grpc_metadata_array_destroy(&trailing_metadata_recv2);
    grpc_metadata_array_destroy(&request_metadata_recv);
    grpc_call_details_destroy(&call_details);
  
    end_test(&f);
    config.tear_down_data(&f);
  }
  
  static void test_max_concurrent_streams_with_timeout_on_second(
      grpc_end2end_test_config config) {
    grpc_end2end_test_fixture f;
    grpc_arg server_arg;
    grpc_channel_args server_args;
    grpc_call *c1;
    grpc_call *c2;
    grpc_call *s1;
    cq_verifier *cqv;
    grpc_call_details call_details;
    grpc_metadata_array request_metadata_recv;
    grpc_metadata_array initial_metadata_recv1;
    grpc_metadata_array trailing_metadata_recv1;
    grpc_metadata_array initial_metadata_recv2;
    grpc_metadata_array trailing_metadata_recv2;
    grpc_status_code status1;
    grpc_call_error error;
    grpc_slice details1 = grpc_empty_slice();
    grpc_status_code status2;
    grpc_slice details2 = grpc_empty_slice();
    grpc_op ops[6];
    grpc_op *op;
    int was_cancelled;
  
    server_arg.key = GRPC_ARG_MAX_CONCURRENT_STREAMS;
    server_arg.type = GRPC_ARG_INTEGER;
    server_arg.value.integer = 1;
  
    server_args.num_args = 1;
    server_args.args = &server_arg;
  
    f = begin_test(config, "test_max_concurrent_streams_with_timeout_on_second",
                   NULL, &server_args);
    cqv = cq_verifier_create(f.cq);
  
    grpc_metadata_array_init(&request_metadata_recv);
    grpc_metadata_array_init(&initial_metadata_recv1);
    grpc_metadata_array_init(&trailing_metadata_recv1);
    grpc_metadata_array_init(&initial_metadata_recv2);
    grpc_metadata_array_init(&trailing_metadata_recv2);
    grpc_call_details_init(&call_details);
  
    /* perform a ping-pong to ensure that settings have had a chance to round
       trip */
    simple_request_body(config, f);
    /* perform another one to make sure that the one stream case still works */
    simple_request_body(config, f);
  
    /* start two requests - ensuring that the second is not accepted until
       the first completes , and the second request will timeout in the
       concurrent_list */
    c1 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/alpha"),
        get_host_override_slice("foo.test.google.fr:1234", config),
        n_seconds_from_now(1000), NULL);
    GPR_ASSERT(c1);
    c2 = grpc_channel_create_call(
        f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
        grpc_slice_from_static_string("/beta"),
        get_host_override_slice("foo.test.google.fr:1234", config),
        n_seconds_from_now(3), NULL);
    GPR_ASSERT(c2);
  
    GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call(
                                   f.server, &s1, &call_details,
                                   &request_metadata_recv, f.cq, f.cq, tag(101)));
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(301), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv1;
    op->data.recv_status_on_client.status = &status1;
    op->data.recv_status_on_client.status_details = &details1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv1;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c1, ops, (size_t)(op - ops), tag(302), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(101), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(301), 1);
    cq_verify(cqv);
  
    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_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(401), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv2;
    op->data.recv_status_on_client.status = &status2;
    op->data.recv_status_on_client.status_details = &details2;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata =
        &initial_metadata_recv2;
    op->flags = 0;
    op->reserved = NULL;
    op++;
    error = grpc_call_start_batch(c2, ops, (size_t)(op - ops), tag(402), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    /* the second request is time out*/
    CQ_EXPECT_COMPLETION(cqv, tag(401), 0);
    CQ_EXPECT_COMPLETION(cqv, tag(402), 1);
    cq_verify(cqv);
  
    /* second request is finished because of time out, so destroy the second call
     */
    grpc_call_unref(c2);
  
    /* now reply the first call */
    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_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    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_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 = NULL;
    op++;
    error = grpc_call_start_batch(s1, ops, (size_t)(op - ops), tag(102), NULL);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(302), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(102), 1);
    cq_verify(cqv);
  
    cq_verifier_destroy(cqv);
  
    grpc_call_unref(c1);
    grpc_call_unref(s1);
  
    grpc_slice_unref(details1);
    grpc_slice_unref(details2);
    grpc_metadata_array_destroy(&initial_metadata_recv1);
    grpc_metadata_array_destroy(&trailing_metadata_recv1);
    grpc_metadata_array_destroy(&initial_metadata_recv2);
    grpc_metadata_array_destroy(&trailing_metadata_recv2);
    grpc_metadata_array_destroy(&request_metadata_recv);
    grpc_call_details_destroy(&call_details);
  
    end_test(&f);
    config.tear_down_data(&f);
  }
  
  void max_concurrent_streams(grpc_end2end_test_config config) {
    test_max_concurrent_streams_with_timeout_on_first(config);
    test_max_concurrent_streams_with_timeout_on_second(config);
    test_max_concurrent_streams(config);
  }
  
  void max_concurrent_streams_pre_init(void) {}
  