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/test_util/reconnect_server.h"
20
21 #include <grpc/support/alloc.h>
22 #include <grpc/support/time.h>
23 #include <string.h>
24
25 #include "absl/log/log.h"
26 #include "absl/strings/string_view.h"
27 #include "src/core/lib/iomgr/endpoint.h"
28 #include "src/core/lib/iomgr/error.h"
29 #include "src/core/lib/iomgr/iomgr_fwd.h"
30 #include "src/core/lib/iomgr/tcp_server.h"
31 #include "test/core/test_util/test_tcp_server.h"
32
pretty_print_backoffs(reconnect_server * server)33 static void pretty_print_backoffs(reconnect_server* server) {
34 gpr_timespec diff;
35 int i = 1;
36 double expected_backoff = 1000.0, backoff;
37 timestamp_list* head = server->head;
38 LOG(INFO) << "reconnect server: new connection";
39 for (head = server->head; head && head->next; head = head->next, i++) {
40 diff = gpr_time_sub(head->next->timestamp, head->timestamp);
41 backoff = gpr_time_to_millis(diff);
42 LOG(INFO) << absl::StrFormat(
43 "retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%", i,
44 backoff / 1000.0, expected_backoff / 1000.0,
45 (backoff - expected_backoff) * 100.0 / expected_backoff);
46 expected_backoff *= 1.6;
47 int max_reconnect_backoff_ms = 120 * 1000;
48 if (server->max_reconnect_backoff_ms > 0) {
49 max_reconnect_backoff_ms = server->max_reconnect_backoff_ms;
50 }
51 if (expected_backoff > max_reconnect_backoff_ms) {
52 expected_backoff = max_reconnect_backoff_ms;
53 }
54 }
55 }
56
on_connect(void * arg,grpc_endpoint * tcp,grpc_pollset *,grpc_tcp_server_acceptor * acceptor)57 static void on_connect(void* arg, grpc_endpoint* tcp,
58 grpc_pollset* /*accepting_pollset*/,
59 grpc_tcp_server_acceptor* acceptor) {
60 gpr_free(acceptor);
61 absl::string_view peer;
62 absl::string_view::size_type last_colon;
63 reconnect_server* server = static_cast<reconnect_server*>(arg);
64 gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
65 timestamp_list* new_tail;
66 peer = grpc_endpoint_get_peer(tcp);
67 grpc_endpoint_destroy(tcp);
68 last_colon = peer.rfind(':');
69 if (server->peer == nullptr) {
70 server->peer = new std::string(peer);
71 } else {
72 if (last_colon == std::string::npos) {
73 LOG(ERROR) << "peer does not contain a ':'";
74 } else if (peer.compare(0, static_cast<size_t>(last_colon),
75 *server->peer) != 0) {
76 LOG(ERROR) << "mismatched peer! " << *server->peer << " vs " << peer;
77 }
78 }
79 new_tail = static_cast<timestamp_list*>(gpr_malloc(sizeof(timestamp_list)));
80 new_tail->timestamp = now;
81 new_tail->next = nullptr;
82 if (server->tail == nullptr) {
83 server->head = new_tail;
84 server->tail = new_tail;
85 } else {
86 server->tail->next = new_tail;
87 server->tail = new_tail;
88 }
89 pretty_print_backoffs(server);
90 }
91
reconnect_server_init(reconnect_server * server)92 void reconnect_server_init(reconnect_server* server) {
93 test_tcp_server_init(&server->tcp_server, on_connect, server);
94 server->head = nullptr;
95 server->tail = nullptr;
96 server->peer = nullptr;
97 server->max_reconnect_backoff_ms = 0;
98 }
99
reconnect_server_start(reconnect_server * server,int port)100 void reconnect_server_start(reconnect_server* server, int port) {
101 test_tcp_server_start(&server->tcp_server, port);
102 }
103
reconnect_server_poll(reconnect_server * server,int seconds)104 void reconnect_server_poll(reconnect_server* server, int seconds) {
105 test_tcp_server_poll(&server->tcp_server, 1000 * seconds);
106 }
107
reconnect_server_clear_timestamps(reconnect_server * server)108 void reconnect_server_clear_timestamps(reconnect_server* server) {
109 timestamp_list* new_head = server->head;
110 while (server->head) {
111 new_head = server->head->next;
112 gpr_free(server->head);
113 server->head = new_head;
114 }
115 server->tail = nullptr;
116 delete server->peer;
117 server->peer = nullptr;
118 }
119
reconnect_server_destroy(reconnect_server * server)120 void reconnect_server_destroy(reconnect_server* server) {
121 reconnect_server_clear_timestamps(server);
122 test_tcp_server_destroy(&server->tcp_server);
123 }
124