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 "test/core/end2end/cq_verifier.h"
  
  static void* tag(intptr_t t) { return reinterpret_cast<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_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);
    /* Note: shutdown_cq is not used in this test */
    grpc_completion_queue_destroy(f->shutdown_cq);
  }
  
  static void test_early_server_shutdown_finishes_inflight_calls(
      grpc_end2end_test_config config) {
    grpc_call* c;
    grpc_call* s;
    grpc_end2end_test_fixture f =
        begin_test(config, "test_early_server_shutdown_finishes_inflight_calls",
                   nullptr, nullptr);
    cq_verifier* cqv = cq_verifier_create(f.cq);
    grpc_op ops[6];
    grpc_op* op;
    grpc_metadata_array initial_metadata_recv;
    grpc_metadata_array trailing_metadata_recv;
    grpc_metadata_array request_metadata_recv;
    grpc_call_details call_details;
    grpc_status_code status;
    grpc_call_error error;
    grpc_slice details;
    int was_cancelled = 2;
  
    gpr_timespec deadline = n_seconds_from_now(10);
    c = grpc_channel_create_call(f.client, nullptr, GRPC_PROPAGATE_DEFAULTS, f.cq,
                                 grpc_slice_from_static_string("/foo"), nullptr,
                                 deadline, nullptr);
    GPR_ASSERT(c);
  
    grpc_metadata_array_init(&initial_metadata_recv);
    grpc_metadata_array_init(&trailing_metadata_recv);
    grpc_metadata_array_init(&request_metadata_recv);
    grpc_call_details_init(&call_details);
  
    memset(ops, 0, sizeof(ops));
    op = ops;
    op->op = GRPC_OP_SEND_INITIAL_METADATA;
    op->data.send_initial_metadata.count = 0;
    op->data.send_initial_metadata.metadata = nullptr;
    op->flags = 0;
    op->reserved = nullptr;
    op++;
    op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT;
    op->flags = 0;
    op->reserved = nullptr;
    op++;
    op->op = GRPC_OP_RECV_INITIAL_METADATA;
    op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv;
    op->flags = 0;
    op->reserved = nullptr;
    op++;
    op->op = GRPC_OP_RECV_STATUS_ON_CLIENT;
    op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv;
    op->data.recv_status_on_client.status = &status;
    op->data.recv_status_on_client.status_details = &details;
    op->flags = 0;
    op->reserved = nullptr;
    op++;
    error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), tag(1),
                                  nullptr);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    error =
        grpc_server_request_call(f.server, &s, &call_details,
                                 &request_metadata_recv, f.cq, f.cq, tag(101));
    GPR_ASSERT(GRPC_CALL_OK == error);
    CQ_EXPECT_COMPLETION(cqv, tag(101), 1);
    cq_verify(cqv);
  
    /* shutdown and destroy the server */
    grpc_server_shutdown_and_notify(f.server, f.cq, tag(0xdead));
    cq_verify_empty(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 = 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_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 = nullptr;
    op++;
    op->op = GRPC_OP_RECV_CLOSE_ON_SERVER;
    op->data.recv_close_on_server.cancelled = &was_cancelled;
    op->flags = 0;
    op->reserved = nullptr;
    op++;
    error = grpc_call_start_batch(s, ops, static_cast<size_t>(op - ops), tag(102),
                                  nullptr);
    GPR_ASSERT(GRPC_CALL_OK == error);
  
    CQ_EXPECT_COMPLETION(cqv, tag(102), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(0xdead), 1);
    CQ_EXPECT_COMPLETION(cqv, tag(1), 1);
    cq_verify(cqv);
  
    grpc_call_unref(s);
  
    GPR_ASSERT(status == GRPC_STATUS_UNIMPLEMENTED);
    GPR_ASSERT(0 == grpc_slice_str_cmp(call_details.method, "/foo"));
    GPR_ASSERT(was_cancelled == 0);
  
    grpc_slice_unref(details);
    grpc_metadata_array_destroy(&initial_metadata_recv);
    grpc_metadata_array_destroy(&trailing_metadata_recv);
    grpc_metadata_array_destroy(&request_metadata_recv);
    grpc_call_details_destroy(&call_details);
  
    grpc_call_unref(c);
  
    cq_verifier_destroy(cqv);
  
    end_test(&f);
    config.tear_down_data(&f);
  }
  
  void graceful_server_shutdown(grpc_end2end_test_config config) {
    test_early_server_shutdown_finishes_inflight_calls(config);
  }
  
  void graceful_server_shutdown_pre_init(void) {}
  