/*
*
* Copyright 2015, Google Inc.
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "test/core/util/reconnect_server.h"
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/host_port.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include <string.h>
#include "src/core/iomgr/endpoint.h"
#include "src/core/iomgr/sockaddr.h"
#include "src/core/iomgr/tcp_server.h"
#include "test/core/util/port.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;
if (expected_backoff > 120 * 1000) {
expected_backoff = 120 * 1000;
}
}
}
static void on_connect(grpc_exec_ctx *exec_ctx, void *arg, grpc_endpoint *tcp) {
char *peer;
char *last_colon;
reconnect_server *server = (reconnect_server *)arg;
gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
timestamp_list *new_tail;
peer = grpc_endpoint_get_peer(tcp);
grpc_endpoint_shutdown(exec_ctx, tcp);
grpc_endpoint_destroy(exec_ctx, tcp);
if (peer) {
last_colon = strrchr(peer, ':');
if (server->peer == NULL) {
server->peer = peer;
} else {
if (last_colon == NULL) {
gpr_log(GPR_ERROR, "peer does not contain a ':'");
} else if (strncmp(server->peer, peer, (size_t)(last_colon - peer)) !=
0) {
gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer, peer);
}
gpr_free(peer);
}
}
new_tail = gpr_malloc(sizeof(timestamp_list));
new_tail->timestamp = now;
new_tail->next = NULL;
if (server->tail == NULL) {
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) {
grpc_init();
server->tcp_server = NULL;
grpc_pollset_init(&server->pollset);
server->pollsets[0] = &server->pollset;
server->head = NULL;
server->tail = NULL;
server->peer = NULL;
}
void reconnect_server_start(reconnect_server *server, int port) {
struct sockaddr_in addr;
int port_added;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
addr.sin_family = AF_INET;
addr.sin_port = htons((gpr_uint16)port);
memset(&addr.sin_addr, 0, sizeof(addr.sin_addr));
server->tcp_server = grpc_tcp_server_create();
port_added =
grpc_tcp_server_add_port(server->tcp_server, &addr, sizeof(addr));
GPR_ASSERT(port_added == port);
grpc_tcp_server_start(&exec_ctx, server->tcp_server, server->pollsets, 1,
on_connect, server);
gpr_log(GPR_INFO, "reconnect tcp server listening on 0.0.0.0:%d", port);
grpc_exec_ctx_finish(&exec_ctx);
}
void reconnect_server_poll(reconnect_server *server, int seconds) {
grpc_pollset_worker worker;
gpr_timespec deadline =
gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
gpr_time_from_seconds(seconds, GPR_TIMESPAN));
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
gpr_mu_lock(GRPC_POLLSET_MU(&server->pollset));
grpc_pollset_work(&exec_ctx, &server->pollset, &worker,
gpr_now(GPR_CLOCK_MONOTONIC), deadline);
gpr_mu_unlock(GRPC_POLLSET_MU(&server->pollset));
grpc_exec_ctx_finish(&exec_ctx);
}
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 = NULL;
gpr_free(server->peer);
server->peer = NULL;
}
static void do_nothing(grpc_exec_ctx *exec_ctx, void *ignored, int success) {}
void reconnect_server_destroy(reconnect_server *server) {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_closure do_nothing_closure[2];
grpc_closure_init(&do_nothing_closure[0], do_nothing, NULL);
grpc_closure_init(&do_nothing_closure[1], do_nothing, NULL);
grpc_tcp_server_destroy(&exec_ctx, server->tcp_server,
&do_nothing_closure[0]);
reconnect_server_clear_timestamps(server);
grpc_pollset_shutdown(&exec_ctx, &server->pollset, &do_nothing_closure[1]);
grpc_exec_ctx_finish(&exec_ctx);
grpc_pollset_destroy(&server->pollset);
grpc_shutdown();
}