Example #1
0
/*
  call-seq:
    cq = CompletionQueue.new
    server = Server.new(cq, {'arg1': 'value1'})
    ... // do stuff with server
    ...
    ... // to shutdown the server
    server.destroy(cq)

    ... // to shutdown the server with a timeout
    server.destroy(cq, timeout)

  Destroys server instances. */
static VALUE grpc_rb_server_destroy(int argc, VALUE *argv, VALUE self) {
    VALUE cqueue = Qnil;
    VALUE timeout = Qnil;
    grpc_completion_queue *cq = NULL;
    grpc_event ev;
    grpc_rb_server *s = NULL;

    /* "11" == 1 mandatory args, 1 (timeout) is optional */
    rb_scan_args(argc, argv, "11", &cqueue, &timeout);
    cq = grpc_rb_get_wrapped_completion_queue(cqueue);
    TypedData_Get_Struct(self, grpc_rb_server, &grpc_rb_server_data_type, s);

    if (s->wrapped != NULL) {
        grpc_server_shutdown_and_notify(s->wrapped, cq, NULL);
        ev = grpc_rb_completion_queue_pluck_event(cqueue, Qnil, timeout);
        if (!ev.success) {
            rb_warn("server shutdown failed, cancelling the calls, objects may leak");
            grpc_server_cancel_all_calls(s->wrapped);
            return Qfalse;
        }
        grpc_server_destroy(s->wrapped);
        s->wrapped = NULL;
    }
    return Qtrue;
}
Example #2
0
static void destroy_server(grpc_rb_server *server, gpr_timespec deadline) {
  grpc_event ev;
  if (server->wrapped != NULL) {
    grpc_server_shutdown_and_notify(server->wrapped, server->queue, NULL);
    ev = rb_completion_queue_pluck(server->queue, NULL, deadline, NULL);
    if (ev.type == GRPC_QUEUE_TIMEOUT) {
      grpc_server_cancel_all_calls(server->wrapped);
      rb_completion_queue_pluck(server->queue, NULL,
                                gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
    }
    grpc_server_destroy(server->wrapped);
    grpc_rb_completion_queue_destroy(server->queue);
    server->wrapped = NULL;
    server->queue = NULL;
  }
}
Example #3
0
static void destroy_server(grpc_rb_server* server, gpr_timespec deadline) {
  grpc_event ev;
  // This can be started by app or implicitly by GC. Avoid a race between these.
  if (gpr_atm_full_fetch_add(&server->shutdown_started, (gpr_atm)1) == 0) {
    if (server->wrapped != NULL) {
      grpc_server_shutdown_and_notify(server->wrapped, server->queue, NULL);
      ev = rb_completion_queue_pluck(server->queue, NULL, deadline, NULL);
      if (ev.type == GRPC_QUEUE_TIMEOUT) {
        grpc_server_cancel_all_calls(server->wrapped);
        rb_completion_queue_pluck(server->queue, NULL,
                                  gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
      }
      grpc_server_destroy(server->wrapped);
      grpc_rb_completion_queue_destroy(server->queue);
      server->wrapped = NULL;
      server->queue = NULL;
    }
  }
}
Example #4
0
GPR_EXPORT void GPR_CALLTYPE grpcsharp_server_cancel_all_calls(grpc_server *server) {
  grpc_server_cancel_all_calls(server);
}
Example #5
0
static void test_early_server_shutdown_finishes_inflight_calls(
    grpc_end2end_test_config config) {
  grpc_call *c;
  grpc_call *s;
  gpr_timespec deadline = five_seconds_time();
  grpc_end2end_test_fixture f = begin_test(
      config, "test_early_server_shutdown_finishes_inflight_calls", NULL, NULL);
  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;
  char *details = NULL;
  size_t details_capacity = 0;
  int was_cancelled = 2;

  c = grpc_channel_create_call(f.client, NULL, GRPC_PROPAGATE_DEFAULTS, f.cq,
                               "/foo", "foo.test.google.fr", 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);

  op = ops;
  op->op = GRPC_OP_SEND_INITIAL_METADATA;
  op->data.send_initial_metadata.count = 0;
  op->data.send_initial_metadata.metadata = NULL;
  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;
  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->data.recv_status_on_client.status_details_capacity = &details_capacity;
  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);

  op = ops;
  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);

  /* shutdown and destroy the server */
  grpc_server_shutdown_and_notify(f.server, f.cq, tag(1000));
  grpc_server_cancel_all_calls(f.server);

  cq_expect_completion(cqv, tag(1000), 1);
  cq_expect_completion(cqv, tag(102), 1);
  cq_expect_completion(cqv, tag(1), 1);
  cq_verify(cqv);

  grpc_server_destroy(f.server);

  GPR_ASSERT(status == GRPC_STATUS_UNAVAILABLE);
  GPR_ASSERT(0 == strcmp(call_details.method, "/foo"));
  GPR_ASSERT(0 == strcmp(call_details.host, "foo.test.google.fr"));
  GPR_ASSERT(was_cancelled == 1);

  gpr_free(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_destroy(c);
  grpc_call_destroy(s);

  cq_verifier_destroy(cqv);

  end_test(&f);
  config.tear_down_data(&f);
}
Example #6
0
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  grpc_test_only_set_slice_hash_seed(0);
  struct grpc_memory_counters counters;
  if (squelch) gpr_set_log_function(dont_log);
  if (leak_check) grpc_memory_counters_init();
  grpc_init();
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
  grpc_executor_set_threading(&exec_ctx, false);

  grpc_resource_quota *resource_quota =
      grpc_resource_quota_create("server_fuzzer");
  grpc_endpoint *mock_endpoint =
      grpc_mock_endpoint_create(discard_write, resource_quota);
  grpc_resource_quota_unref_internal(&exec_ctx, resource_quota);
  grpc_mock_endpoint_put_read(
      &exec_ctx, mock_endpoint,
      grpc_slice_from_copied_buffer((const char *)data, size));

  grpc_server *server = grpc_server_create(NULL, NULL);
  grpc_completion_queue *cq = grpc_completion_queue_create_for_next(NULL);
  grpc_server_register_completion_queue(server, cq, NULL);
  // TODO(ctiller): add registered methods (one for POST, one for PUT)
  // void *registered_method =
  //    grpc_server_register_method(server, "/reg", NULL, 0);
  grpc_server_start(server);
  grpc_transport *transport =
      grpc_create_chttp2_transport(&exec_ctx, NULL, mock_endpoint, 0);
  grpc_server_setup_transport(&exec_ctx, server, transport, NULL, NULL);
  grpc_chttp2_transport_start_reading(&exec_ctx, transport, NULL);

  grpc_call *call1 = NULL;
  grpc_call_details call_details1;
  grpc_metadata_array request_metadata1;
  grpc_call_details_init(&call_details1);
  grpc_metadata_array_init(&request_metadata1);
  int requested_calls = 0;

  GPR_ASSERT(GRPC_CALL_OK ==
             grpc_server_request_call(server, &call1, &call_details1,
                                      &request_metadata1, cq, cq, tag(1)));
  requested_calls++;

  grpc_event ev;
  while (1) {
    grpc_exec_ctx_flush(&exec_ctx);
    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
    switch (ev.type) {
      case GRPC_QUEUE_TIMEOUT:
        goto done;
      case GRPC_QUEUE_SHUTDOWN:
        break;
      case GRPC_OP_COMPLETE:
        switch (detag(ev.tag)) {
          case 1:
            requested_calls--;
            // TODO(ctiller): keep reading that call!
            break;
        }
    }
  }

done:
  if (call1 != NULL) grpc_call_unref(call1);
  grpc_call_details_destroy(&call_details1);
  grpc_metadata_array_destroy(&request_metadata1);
  grpc_server_shutdown_and_notify(server, cq, tag(0xdead));
  grpc_server_cancel_all_calls(server);
  for (int i = 0; i <= requested_calls; i++) {
    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
    GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
  }
  grpc_completion_queue_shutdown(cq);
  for (int i = 0; i <= requested_calls; i++) {
    ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
    GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
  }
  grpc_server_destroy(server);
  grpc_completion_queue_destroy(cq);
  grpc_shutdown();
  if (leak_check) {
    counters = grpc_memory_counters_snapshot();
    grpc_memory_counters_destroy();
    GPR_ASSERT(counters.total_size_relative == 0);
  }
  return 0;
}
Example #7
0
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  grpc_test_only_set_metadata_hash_seed(0);
  if (squelch) gpr_set_log_function(dont_log);
  input_stream inp = {data, data + size};
  grpc_resolve_address = my_resolve_address;
  grpc_tcp_client_connect_impl = my_tcp_client_connect;
  gpr_now_impl = now_impl;
  grpc_init();

  GPR_ASSERT(g_channel == NULL);
  GPR_ASSERT(g_server == NULL);

  bool server_shutdown = false;
  int pending_server_shutdowns = 0;
  int pending_channel_watches = 0;
  int pending_pings = 0;

  g_active_call = new_call(NULL, ROOT);

  grpc_completion_queue *cq = grpc_completion_queue_create(NULL);

  while (!is_eof(&inp) || g_channel != NULL || g_server != NULL ||
         pending_channel_watches > 0 || pending_pings > 0 ||
         g_active_call->type != ROOT || g_active_call->next != g_active_call) {
    if (is_eof(&inp)) {
      if (g_channel != NULL) {
        grpc_channel_destroy(g_channel);
        g_channel = NULL;
      }
      if (g_server != NULL) {
        if (!server_shutdown) {
          grpc_server_shutdown_and_notify(
              g_server, cq, create_validator(assert_success_and_decrement,
                                             &pending_server_shutdowns));
          server_shutdown = true;
          pending_server_shutdowns++;
        } else if (pending_server_shutdowns == 0) {
          grpc_server_destroy(g_server);
          g_server = NULL;
        }
      }
      call_state *s = g_active_call;
      do {
        if (s->type != PENDING_SERVER && s->call != NULL) {
          s = destroy_call(s);
        } else {
          s = s->next;
        }
      } while (s != g_active_call);

      g_now = gpr_time_add(g_now, gpr_time_from_seconds(1, GPR_TIMESPAN));
    }

    switch (next_byte(&inp)) {
      // terminate on bad bytes
      default:
        end(&inp);
        break;
      // tickle completion queue
      case 0: {
        grpc_event ev = grpc_completion_queue_next(
            cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL);
        switch (ev.type) {
          case GRPC_OP_COMPLETE: {
            validator *v = ev.tag;
            v->validate(v->arg, ev.success);
            gpr_free(v);
            break;
          }
          case GRPC_QUEUE_TIMEOUT:
            break;
          case GRPC_QUEUE_SHUTDOWN:
            abort();
            break;
        }
        break;
      }
      // increment global time
      case 1: {
        g_now = gpr_time_add(
            g_now, gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));
        break;
      }
      // create an insecure channel
      case 2: {
        if (g_channel == NULL) {
          char *target = read_string(&inp);
          char *target_uri;
          gpr_asprintf(&target_uri, "dns:%s", target);
          grpc_channel_args *args = read_args(&inp);
          g_channel = grpc_insecure_channel_create(target_uri, args, NULL);
          GPR_ASSERT(g_channel != NULL);
          grpc_channel_args_destroy(args);
          gpr_free(target_uri);
          gpr_free(target);
        } else {
          end(&inp);
        }
        break;
      }
      // destroy a channel
      case 3: {
        if (g_channel != NULL) {
          grpc_channel_destroy(g_channel);
          g_channel = NULL;
        } else {
          end(&inp);
        }
        break;
      }
      // bring up a server
      case 4: {
        if (g_server == NULL) {
          grpc_channel_args *args = read_args(&inp);
          g_server = grpc_server_create(args, NULL);
          GPR_ASSERT(g_server != NULL);
          grpc_channel_args_destroy(args);
          grpc_server_register_completion_queue(g_server, cq, NULL);
          grpc_server_start(g_server);
          server_shutdown = false;
          GPR_ASSERT(pending_server_shutdowns == 0);
        } else {
          end(&inp);
        }
      }
      // begin server shutdown
      case 5: {
        if (g_server != NULL) {
          grpc_server_shutdown_and_notify(
              g_server, cq, create_validator(assert_success_and_decrement,
                                             &pending_server_shutdowns));
          pending_server_shutdowns++;
          server_shutdown = true;
        } else {
          end(&inp);
        }
        break;
      }
      // cancel all calls if shutdown
      case 6: {
        if (g_server != NULL && server_shutdown) {
          grpc_server_cancel_all_calls(g_server);
        } else {
          end(&inp);
        }
        break;
      }
      // destroy server
      case 7: {
        if (g_server != NULL && server_shutdown &&
            pending_server_shutdowns == 0) {
          grpc_server_destroy(g_server);
          g_server = NULL;
        } else {
          end(&inp);
        }
        break;
      }
      // check connectivity
      case 8: {
        if (g_channel != NULL) {
          uint8_t try_to_connect = next_byte(&inp);
          if (try_to_connect == 0 || try_to_connect == 1) {
            grpc_channel_check_connectivity_state(g_channel, try_to_connect);
          } else {
            end(&inp);
          }
        } else {
          end(&inp);
        }
        break;
      }
      // watch connectivity
      case 9: {
        if (g_channel != NULL) {
          grpc_connectivity_state st =
              grpc_channel_check_connectivity_state(g_channel, 0);
          if (st != GRPC_CHANNEL_FATAL_FAILURE) {
            gpr_timespec deadline = gpr_time_add(
                gpr_now(GPR_CLOCK_REALTIME),
                gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));
            grpc_channel_watch_connectivity_state(
                g_channel, st, deadline, cq,
                create_validator(validate_connectivity_watch,
                                 make_connectivity_watch(
                                     deadline, &pending_channel_watches)));
            pending_channel_watches++;
          }
        } else {
          end(&inp);
        }
        break;
      }
      // create a call
      case 10: {
        bool ok = true;
        if (g_channel == NULL) ok = false;
        grpc_call *parent_call = NULL;
        if (g_active_call->type != ROOT) {
          if (g_active_call->call == NULL || g_active_call->type == CLIENT) {
            end(&inp);
            break;
          }
          parent_call = g_active_call->call;
        }
        uint32_t propagation_mask = read_uint32(&inp);
        char *method = read_string(&inp);
        char *host = read_string(&inp);
        gpr_timespec deadline =
            gpr_time_add(gpr_now(GPR_CLOCK_REALTIME),
                         gpr_time_from_micros(read_uint32(&inp), GPR_TIMESPAN));

        if (ok) {
          call_state *cs = new_call(g_active_call, CLIENT);
          cs->call =
              grpc_channel_create_call(g_channel, parent_call, propagation_mask,
                                       cq, method, host, deadline, NULL);
        } else {
          end(&inp);
        }
        gpr_free(method);
        gpr_free(host);
        break;
      }
      // switch the 'current' call
      case 11: {
        g_active_call = g_active_call->next;
        break;
      }
      // queue some ops on a call
      case 12: {
        if (g_active_call->type == PENDING_SERVER ||
            g_active_call->type == ROOT || g_active_call->call == NULL) {
          end(&inp);
          break;
        }
        size_t num_ops = next_byte(&inp);
        if (num_ops > 6) {
          end(&inp);
          break;
        }
        grpc_op *ops = gpr_malloc(sizeof(grpc_op) * num_ops);
        bool ok = true;
        size_t i;
        grpc_op *op;
        for (i = 0; i < num_ops; i++) {
          op = &ops[i];
          switch (next_byte(&inp)) {
            default:
              /* invalid value */
              op->op = (grpc_op_type)-1;
              ok = false;
              break;
            case GRPC_OP_SEND_INITIAL_METADATA:
              op->op = GRPC_OP_SEND_INITIAL_METADATA;
              read_metadata(&inp, &op->data.send_initial_metadata.count,
                            &op->data.send_initial_metadata.metadata,
                            g_active_call);
              break;
            case GRPC_OP_SEND_MESSAGE:
              op->op = GRPC_OP_SEND_MESSAGE;
              op->data.send_message = read_message(&inp);
              break;
            case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
              op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
              break;
            case GRPC_OP_SEND_STATUS_FROM_SERVER:
              op->op = GRPC_OP_SEND_STATUS_FROM_SERVER;
              read_metadata(
                  &inp,
                  &op->data.send_status_from_server.trailing_metadata_count,
                  &op->data.send_status_from_server.trailing_metadata,
                  g_active_call);
              op->data.send_status_from_server.status = next_byte(&inp);
              op->data.send_status_from_server.status_details =
                  read_string(&inp);
              break;
            case GRPC_OP_RECV_INITIAL_METADATA:
              op->op = GRPC_OP_RECV_INITIAL_METADATA;
              op->data.recv_initial_metadata =
                  &g_active_call->recv_initial_metadata;
              break;
            case GRPC_OP_RECV_MESSAGE:
              op->op = GRPC_OP_RECV_MESSAGE;
              op->data.recv_message = &g_active_call->recv_message;
              break;
            case GRPC_OP_RECV_STATUS_ON_CLIENT:
              op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
              op->data.recv_status_on_client.status = &g_active_call->status;
              op->data.recv_status_on_client.trailing_metadata =
                  &g_active_call->recv_trailing_metadata;
              op->data.recv_status_on_client.status_details =
                  &g_active_call->recv_status_details;
              op->data.recv_status_on_client.status_details_capacity =
                  &g_active_call->recv_status_details_capacity;
              break;
            case GRPC_OP_RECV_CLOSE_ON_SERVER:
              op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
              op->data.recv_close_on_server.cancelled =
                  &g_active_call->cancelled;
              break;
          }
          op->reserved = NULL;
          op->flags = read_uint32(&inp);
        }
        if (ok) {
          validator *v = create_validator(finished_batch, g_active_call);
          g_active_call->pending_ops++;
          grpc_call_error error =
              grpc_call_start_batch(g_active_call->call, ops, num_ops, v, NULL);
          if (error != GRPC_CALL_OK) {
            v->validate(v->arg, false);
            gpr_free(v);
          }
        } else {
          end(&inp);
        }
        for (i = 0; i < num_ops; i++) {
          op = &ops[i];
          switch (op->op) {
            case GRPC_OP_SEND_INITIAL_METADATA:
              break;
            case GRPC_OP_SEND_MESSAGE:
              grpc_byte_buffer_destroy(op->data.send_message);
              break;
            case GRPC_OP_SEND_STATUS_FROM_SERVER:
              gpr_free((void *)op->data.send_status_from_server.status_details);
              break;
            case GRPC_OP_SEND_CLOSE_FROM_CLIENT:
            case GRPC_OP_RECV_INITIAL_METADATA:
            case GRPC_OP_RECV_MESSAGE:
            case GRPC_OP_RECV_STATUS_ON_CLIENT:
            case GRPC_OP_RECV_CLOSE_ON_SERVER:
              break;
          }
        }
        gpr_free(ops);

        break;
      }
      // cancel current call
      case 13: {
        if (g_active_call->type != ROOT && g_active_call->call != NULL) {
          grpc_call_cancel(g_active_call->call, NULL);
        } else {
          end(&inp);
        }
        break;
      }
      // get a calls peer
      case 14: {
        if (g_active_call->type != ROOT && g_active_call->call != NULL) {
          free_non_null(grpc_call_get_peer(g_active_call->call));
        } else {
          end(&inp);
        }
        break;
      }
      // get a channels target
      case 15: {
        if (g_channel != NULL) {
          free_non_null(grpc_channel_get_target(g_channel));
        } else {
          end(&inp);
        }
        break;
      }
      // send a ping on a channel
      case 16: {
        if (g_channel != NULL) {
          pending_pings++;
          grpc_channel_ping(g_channel, cq,
                            create_validator(decrement, &pending_pings), NULL);
        } else {
          end(&inp);
        }
        break;
      }
      // enable a tracer
      case 17: {
        char *tracer = read_string(&inp);
        grpc_tracer_set_enabled(tracer, 1);
        gpr_free(tracer);
        break;
      }
      // disable a tracer
      case 18: {
        char *tracer = read_string(&inp);
        grpc_tracer_set_enabled(tracer, 0);
        gpr_free(tracer);
        break;
      }
      // request a server call
      case 19: {
        if (g_server == NULL) {
          end(&inp);
          break;
        }
        call_state *cs = new_call(g_active_call, PENDING_SERVER);
        cs->pending_ops++;
        validator *v = create_validator(finished_request_call, cs);
        grpc_call_error error =
            grpc_server_request_call(g_server, &cs->call, &cs->call_details,
                                     &cs->recv_initial_metadata, cq, cq, v);
        if (error != GRPC_CALL_OK) {
          v->validate(v->arg, false);
          gpr_free(v);
        }
        break;
      }
      // destroy a call
      case 20: {
        if (g_active_call->type != ROOT &&
            g_active_call->type != PENDING_SERVER &&
            g_active_call->call != NULL) {
          destroy_call(g_active_call);
        } else {
          end(&inp);
        }
        break;
      }
    }
  }

  GPR_ASSERT(g_channel == NULL);
  GPR_ASSERT(g_server == NULL);
  GPR_ASSERT(g_active_call->type == ROOT);
  GPR_ASSERT(g_active_call->next == g_active_call);
  gpr_free(g_active_call);

  grpc_completion_queue_shutdown(cq);
  GPR_ASSERT(
      grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME), NULL)
          .type == GRPC_QUEUE_SHUTDOWN);
  grpc_completion_queue_destroy(cq);

  grpc_shutdown();
  return 0;
}