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/sync.h>
25 #include <grpc/support/time.h>
26 #include <string.h>
27
28 #include "src/core/lib/iomgr/endpoint.h"
29 #include "src/core/lib/iomgr/sockaddr.h"
30 #include "src/core/lib/iomgr/tcp_server.h"
31 #include "test/core/util/port.h"
32 #include "test/core/util/test_tcp_server.h"
33
pretty_print_backoffs(reconnect_server * server)34 static void pretty_print_backoffs(reconnect_server* server) {
35 gpr_timespec diff;
36 int i = 1;
37 double expected_backoff = 1000.0, backoff;
38 timestamp_list* head = server->head;
39 gpr_log(GPR_INFO, "reconnect server: new connection");
40 for (head = server->head; head && head->next; head = head->next, i++) {
41 diff = gpr_time_sub(head->next->timestamp, head->timestamp);
42 backoff = gpr_time_to_millis(diff);
43 gpr_log(GPR_INFO,
44 "retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%",
45 i, backoff / 1000.0, expected_backoff / 1000.0,
46 (backoff - expected_backoff) * 100.0 / expected_backoff);
47 expected_backoff *= 1.6;
48 int max_reconnect_backoff_ms = 120 * 1000;
49 if (server->max_reconnect_backoff_ms > 0) {
50 max_reconnect_backoff_ms = server->max_reconnect_backoff_ms;
51 }
52 if (expected_backoff > max_reconnect_backoff_ms) {
53 expected_backoff = max_reconnect_backoff_ms;
54 }
55 }
56 }
57
on_connect(void * arg,grpc_endpoint * tcp,grpc_pollset *,grpc_tcp_server_acceptor * acceptor)58 static void on_connect(void* arg, grpc_endpoint* tcp,
59 grpc_pollset* /*accepting_pollset*/,
60 grpc_tcp_server_acceptor* acceptor) {
61 gpr_free(acceptor);
62 char* peer;
63 char* last_colon;
64 reconnect_server* server = static_cast<reconnect_server*>(arg);
65 gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
66 timestamp_list* new_tail;
67 peer = grpc_endpoint_get_peer(tcp);
68 grpc_endpoint_shutdown(tcp,
69 GRPC_ERROR_CREATE_FROM_STATIC_STRING("Connected"));
70 grpc_endpoint_destroy(tcp);
71 if (peer) {
72 last_colon = strrchr(peer, ':');
73 if (server->peer == nullptr) {
74 server->peer = peer;
75 } else {
76 if (last_colon == nullptr) {
77 gpr_log(GPR_ERROR, "peer does not contain a ':'");
78 } else if (strncmp(server->peer, peer,
79 static_cast<size_t>(last_colon - peer)) != 0) {
80 gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer, peer);
81 }
82 gpr_free(peer);
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
reconnect_server_init(reconnect_server * server)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
reconnect_server_start(reconnect_server * server,int port)106 void reconnect_server_start(reconnect_server* server, int port) {
107 test_tcp_server_start(&server->tcp_server, port);
108 }
109
reconnect_server_poll(reconnect_server * server,int seconds)110 void reconnect_server_poll(reconnect_server* server, int seconds) {
111 test_tcp_server_poll(&server->tcp_server, 1000 * seconds);
112 }
113
reconnect_server_clear_timestamps(reconnect_server * server)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 gpr_free(server->peer);
123 server->peer = nullptr;
124 }
125
reconnect_server_destroy(reconnect_server * server)126 void reconnect_server_destroy(reconnect_server* server) {
127 reconnect_server_clear_timestamps(server);
128 test_tcp_server_destroy(&server->tcp_server);
129 }
130