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/*
*
* 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/util/reconnect_server.h"
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include <string.h>
#include "src/core/lib/gpr/host_port.h"
#include "src/core/lib/iomgr/endpoint.h"
#include "src/core/lib/iomgr/sockaddr.h"
#include "src/core/lib/iomgr/tcp_server.h"
#include "test/core/util/port.h"
#include "test/core/util/test_tcp_server.h"
static void pretty_print_backoffs(reconnect_server* server) {
gpr_timespec diff;
int i = 1;
double expected_backoff = 1000.0, backoff;
timestamp_list* head = server->head;
gpr_log(GPR_INFO, "reconnect server: new connection");
for (head = server->head; head && head->next; head = head->next, i++) {
diff = gpr_time_sub(head->next->timestamp, head->timestamp);
backoff = gpr_time_to_millis(diff);
gpr_log(GPR_INFO,
"retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%",
i, backoff / 1000.0, expected_backoff / 1000.0,
(backoff - expected_backoff) * 100.0 / expected_backoff);
expected_backoff *= 1.6;
int max_reconnect_backoff_ms = 120 * 1000;
if (server->max_reconnect_backoff_ms > 0) {
max_reconnect_backoff_ms = server->max_reconnect_backoff_ms;
}
if (expected_backoff > max_reconnect_backoff_ms) {
expected_backoff = max_reconnect_backoff_ms;
}
}
}
static void on_connect(void* arg, grpc_endpoint* tcp,
grpc_pollset* accepting_pollset,
grpc_tcp_server_acceptor* acceptor) {
gpr_free(acceptor);
char* peer;
char* last_colon;
reconnect_server* server = static_cast<reconnect_server*>(arg);
gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
timestamp_list* new_tail;
peer = grpc_endpoint_get_peer(tcp);
grpc_endpoint_shutdown(tcp,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Connected"));
grpc_endpoint_destroy(tcp);
if (peer) {
last_colon = strrchr(peer, ':');
if (server->peer == nullptr) {
server->peer = peer;
} else {
if (last_colon == nullptr) {
gpr_log(GPR_ERROR, "peer does not contain a ':'");
} else if (strncmp(server->peer, peer,
static_cast<size_t>(last_colon - peer)) != 0) {
gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer, peer);
}
gpr_free(peer);
}
}
new_tail = static_cast<timestamp_list*>(gpr_malloc(sizeof(timestamp_list)));
new_tail->timestamp = now;
new_tail->next = nullptr;
if (server->tail == nullptr) {
server->head = new_tail;
server->tail = new_tail;
} else {
server->tail->next = new_tail;
server->tail = new_tail;
}
pretty_print_backoffs(server);
}
void reconnect_server_init(reconnect_server* server) {
test_tcp_server_init(&server->tcp_server, on_connect, server);
server->head = nullptr;
server->tail = nullptr;
server->peer = nullptr;
server->max_reconnect_backoff_ms = 0;
}
void reconnect_server_start(reconnect_server* server, int port) {
test_tcp_server_start(&server->tcp_server, port);
}
void reconnect_server_poll(reconnect_server* server, int seconds) {
test_tcp_server_poll(&server->tcp_server, seconds);
}
void reconnect_server_clear_timestamps(reconnect_server* server) {
timestamp_list* new_head = server->head;
while (server->head) {
new_head = server->head->next;
gpr_free(server->head);
server->head = new_head;
}
server->tail = nullptr;
gpr_free(server->peer);
server->peer = nullptr;
}
void reconnect_server_destroy(reconnect_server* server) {
reconnect_server_clear_timestamps(server);
test_tcp_server_destroy(&server->tcp_server);
}
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