test/core/util/reconnect_server.cc

   1 /*
   2  *
   3  * Copyright 2015 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include "test/core/util/reconnect_server.h"
  20
  21 #include <grpc/grpc.h>
  22 #include <grpc/support/alloc.h>
  23 #include <grpc/support/log.h>
  24 #include <grpc/support/string_util.h>
  25 #include <grpc/support/sync.h>
  26 #include <grpc/support/time.h>
  27 #include <string.h>
  28
  29 #include "absl/strings/string_view.h"
  30 #include "src/core/lib/iomgr/endpoint.h"
  31 #include "src/core/lib/iomgr/sockaddr.h"
  32 #include "src/core/lib/iomgr/tcp_server.h"
  33 #include "test/core/util/port.h"
  34 #include "test/core/util/test_tcp_server.h"
  35
  36 static void pretty_print_backoffs(reconnect_server* server) {
  37   gpr_timespec diff;
  38   int i = 1;
  39   double expected_backoff = 1000.0, backoff;
  40   timestamp_list* head = server->head;
  41   gpr_log(GPR_INFO, "reconnect server: new connection");
  42   for (head = server->head; head && head->next; head = head->next, i++) {
  43     diff = gpr_time_sub(head->next->timestamp, head->timestamp);
  44     backoff = gpr_time_to_millis(diff);
  45     gpr_log(GPR_INFO,
  46             "retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%",
  47             i, backoff / 1000.0, expected_backoff / 1000.0,
  48             (backoff - expected_backoff) * 100.0 / expected_backoff);
  49     expected_backoff *= 1.6;
  50     int max_reconnect_backoff_ms = 120 * 1000;
  51     if (server->max_reconnect_backoff_ms > 0) {
  52       max_reconnect_backoff_ms = server->max_reconnect_backoff_ms;
  53     }
  54     if (expected_backoff > max_reconnect_backoff_ms) {
  55       expected_backoff = max_reconnect_backoff_ms;
  56     }
  57   }
  58 }
  59
  60 static void on_connect(void* arg, grpc_endpoint* tcp,
  61                        grpc_pollset* /*accepting_pollset*/,
  62                        grpc_tcp_server_acceptor* acceptor) {
  63   gpr_free(acceptor);
  64   absl::string_view peer;
  65   absl::string_view::size_type last_colon;
  66   reconnect_server* server = static_cast<reconnect_server*>(arg);
  67   gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
  68   timestamp_list* new_tail;
  69   peer = grpc_endpoint_get_peer(tcp);
  70   grpc_endpoint_shutdown(tcp,
  71                          GRPC_ERROR_CREATE_FROM_STATIC_STRING("Connected"));
  72   grpc_endpoint_destroy(tcp);
  73   last_colon = peer.rfind(':');
  74   if (server->peer == nullptr) {
  75     server->peer = new std::string(peer);
  76   } else {
  77     if (last_colon == std::string::npos) {
  78       gpr_log(GPR_ERROR, "peer does not contain a ':'");
  79     } else if (peer.compare(0, static_cast<size_t>(last_colon),
  80                             *server->peer) != 0) {
  81       gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer->c_str(),
  82               std::string(peer).c_str());
  83     }
  84   }
  85   new_tail = static_cast<timestamp_list*>(gpr_malloc(sizeof(timestamp_list)));
  86   new_tail->timestamp = now;
  87   new_tail->next = nullptr;
  88   if (server->tail == nullptr) {
  89     server->head = new_tail;
  90     server->tail = new_tail;
  91   } else {
  92     server->tail->next = new_tail;
  93     server->tail = new_tail;
  94   }
  95   pretty_print_backoffs(server);
  96 }
  97
  98 void reconnect_server_init(reconnect_server* server) {
  99   test_tcp_server_init(&server->tcp_server, on_connect, server);
 100   server->head = nullptr;
 101   server->tail = nullptr;
 102   server->peer = nullptr;
 103   server->max_reconnect_backoff_ms = 0;
 104 }
 105
 106 void reconnect_server_start(reconnect_server* server, int port) {
 107   test_tcp_server_start(&server->tcp_server, port);
 108 }
 109
 110 void reconnect_server_poll(reconnect_server* server, int seconds) {
 111   test_tcp_server_poll(&server->tcp_server, 1000 * seconds);
 112 }
 113
 114 void reconnect_server_clear_timestamps(reconnect_server* server) {
 115   timestamp_list* new_head = server->head;
 116   while (server->head) {
 117     new_head = server->head->next;
 118     gpr_free(server->head);
 119     server->head = new_head;
 120   }
 121   server->tail = nullptr;
 122   delete server->peer;
 123   server->peer = nullptr;
 124 }
 125
 126 void reconnect_server_destroy(reconnect_server* server) {
 127   reconnect_server_clear_timestamps(server);
 128   test_tcp_server_destroy(&server->tcp_server);
 129 }