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 <string.h>
22
23 #include "absl/strings/string_view.h"
24
25 #include <grpc/support/alloc.h>
26 #include <grpc/support/log.h>
27 #include <grpc/support/time.h>
28
29 #include "src/core/lib/iomgr/endpoint.h"
30 #include "src/core/lib/iomgr/error.h"
31 #include "src/core/lib/iomgr/iomgr_fwd.h"
32 #include "src/core/lib/iomgr/tcp_server.h"
33 #include "test/core/util/test_tcp_server.h"
34
pretty_print_backoffs(reconnect_server * server)35 static void pretty_print_backoffs(reconnect_server* server) {
36 gpr_timespec diff;
37 int i = 1;
38 double expected_backoff = 1000.0, backoff;
39 timestamp_list* head = server->head;
40 gpr_log(GPR_INFO, "reconnect server: new connection");
41 for (head = server->head; head && head->next; head = head->next, i++) {
42 diff = gpr_time_sub(head->next->timestamp, head->timestamp);
43 backoff = gpr_time_to_millis(diff);
44 gpr_log(GPR_INFO,
45 "retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%",
46 i, backoff / 1000.0, expected_backoff / 1000.0,
47 (backoff - expected_backoff) * 100.0 / expected_backoff);
48 expected_backoff *= 1.6;
49 int max_reconnect_backoff_ms = 120 * 1000;
50 if (server->max_reconnect_backoff_ms > 0) {
51 max_reconnect_backoff_ms = server->max_reconnect_backoff_ms;
52 }
53 if (expected_backoff > max_reconnect_backoff_ms) {
54 expected_backoff = max_reconnect_backoff_ms;
55 }
56 }
57 }
58
on_connect(void * arg,grpc_endpoint * tcp,grpc_pollset *,grpc_tcp_server_acceptor * acceptor)59 static void on_connect(void* arg, grpc_endpoint* tcp,
60 grpc_pollset* /*accepting_pollset*/,
61 grpc_tcp_server_acceptor* acceptor) {
62 gpr_free(acceptor);
63 absl::string_view peer;
64 absl::string_view::size_type last_colon;
65 reconnect_server* server = static_cast<reconnect_server*>(arg);
66 gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
67 timestamp_list* new_tail;
68 peer = grpc_endpoint_get_peer(tcp);
69 grpc_endpoint_shutdown(tcp, GRPC_ERROR_CREATE("Connected"));
70 grpc_endpoint_destroy(tcp);
71 last_colon = peer.rfind(':');
72 if (server->peer == nullptr) {
73 server->peer = new std::string(peer);
74 } else {
75 if (last_colon == std::string::npos) {
76 gpr_log(GPR_ERROR, "peer does not contain a ':'");
77 } else if (peer.compare(0, static_cast<size_t>(last_colon),
78 *server->peer) != 0) {
79 gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer->c_str(),
80 std::string(peer).c_str());
81 }
82 }
83 new_tail = static_cast<timestamp_list*>(gpr_malloc(sizeof(timestamp_list)));
84 new_tail->timestamp = now;
85 new_tail->next = nullptr;
86 if (server->tail == nullptr) {
87 server->head = new_tail;
88 server->tail = new_tail;
89 } else {
90 server->tail->next = new_tail;
91 server->tail = new_tail;
92 }
93 pretty_print_backoffs(server);
94 }
95
reconnect_server_init(reconnect_server * server)96 void reconnect_server_init(reconnect_server* server) {
97 test_tcp_server_init(&server->tcp_server, on_connect, server);
98 server->head = nullptr;
99 server->tail = nullptr;
100 server->peer = nullptr;
101 server->max_reconnect_backoff_ms = 0;
102 }
103
reconnect_server_start(reconnect_server * server,int port)104 void reconnect_server_start(reconnect_server* server, int port) {
105 test_tcp_server_start(&server->tcp_server, port);
106 }
107
reconnect_server_poll(reconnect_server * server,int seconds)108 void reconnect_server_poll(reconnect_server* server, int seconds) {
109 test_tcp_server_poll(&server->tcp_server, 1000 * seconds);
110 }
111
reconnect_server_clear_timestamps(reconnect_server * server)112 void reconnect_server_clear_timestamps(reconnect_server* server) {
113 timestamp_list* new_head = server->head;
114 while (server->head) {
115 new_head = server->head->next;
116 gpr_free(server->head);
117 server->head = new_head;
118 }
119 server->tail = nullptr;
120 delete server->peer;
121 server->peer = nullptr;
122 }
123
reconnect_server_destroy(reconnect_server * server)124 void reconnect_server_destroy(reconnect_server* server) {
125 reconnect_server_clear_timestamps(server);
126 test_tcp_server_destroy(&server->tcp_server);
127 }
128