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/*
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*
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* Copyright 2015, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "test/core/util/reconnect_server.h"
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#include <grpc/grpc.h>
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#include <grpc/support/alloc.h>
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#include <grpc/support/host_port.h>
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#include <grpc/support/log.h>
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#include <grpc/support/sync.h>
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#include <grpc/support/time.h>
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#include <string.h>
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#include "src/core/iomgr/endpoint.h"
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#include "src/core/iomgr/sockaddr.h"
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#include "src/core/iomgr/tcp_server.h"
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#include "test/core/util/port.h"
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static void pretty_print_backoffs(reconnect_server *server) {
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gpr_timespec diff;
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int i = 1;
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double expected_backoff = 1000.0, backoff;
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timestamp_list *head = server->head;
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gpr_log(GPR_INFO, "reconnect server: new connection");
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for (head = server->head; head && head->next; head = head->next, i++) {
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diff = gpr_time_sub(head->next->timestamp, head->timestamp);
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backoff = gpr_time_to_millis(diff);
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gpr_log(GPR_INFO,
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"retry %2d:backoff %6.2fs,expected backoff %6.2fs, jitter %4.2f%%",
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i, backoff / 1000.0, expected_backoff / 1000.0,
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(backoff - expected_backoff) * 100.0 / expected_backoff);
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expected_backoff *= 1.6;
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if (expected_backoff > 120 * 1000) {
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expected_backoff = 120 * 1000;
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}
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}
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}
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static void on_connect(grpc_exec_ctx *exec_ctx, void *arg, grpc_endpoint *tcp) {
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char *peer;
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char *last_colon;
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reconnect_server *server = (reconnect_server *)arg;
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gpr_timespec now = gpr_now(GPR_CLOCK_REALTIME);
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timestamp_list *new_tail;
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peer = grpc_endpoint_get_peer(tcp);
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grpc_endpoint_shutdown(exec_ctx, tcp);
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grpc_endpoint_destroy(exec_ctx, tcp);
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if (peer) {
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last_colon = strrchr(peer, ':');
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if (server->peer == NULL) {
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server->peer = peer;
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} else {
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if (last_colon == NULL) {
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gpr_log(GPR_ERROR, "peer does not contain a ':'");
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} else if (strncmp(server->peer, peer, (size_t)(last_colon - peer)) !=
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0) {
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gpr_log(GPR_ERROR, "mismatched peer! %s vs %s", server->peer, peer);
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}
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gpr_free(peer);
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}
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}
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new_tail = gpr_malloc(sizeof(timestamp_list));
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new_tail->timestamp = now;
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new_tail->next = NULL;
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if (server->tail == NULL) {
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server->head = new_tail;
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server->tail = new_tail;
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} else {
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server->tail->next = new_tail;
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server->tail = new_tail;
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}
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pretty_print_backoffs(server);
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}
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void reconnect_server_init(reconnect_server *server) {
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grpc_init();
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server->tcp_server = NULL;
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grpc_pollset_init(&server->pollset);
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server->pollsets[0] = &server->pollset;
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server->head = NULL;
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server->tail = NULL;
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server->peer = NULL;
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}
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void reconnect_server_start(reconnect_server *server, int port) {
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struct sockaddr_in addr;
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int port_added;
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grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
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addr.sin_family = AF_INET;
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addr.sin_port = htons((gpr_uint16)port);
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memset(&addr.sin_addr, 0, sizeof(addr.sin_addr));
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server->tcp_server = grpc_tcp_server_create();
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port_added =
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grpc_tcp_server_add_port(server->tcp_server, &addr, sizeof(addr));
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GPR_ASSERT(port_added == port);
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grpc_tcp_server_start(&exec_ctx, server->tcp_server, server->pollsets, 1,
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on_connect, server);
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gpr_log(GPR_INFO, "reconnect tcp server listening on 0.0.0.0:%d", port);
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grpc_exec_ctx_finish(&exec_ctx);
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}
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void reconnect_server_poll(reconnect_server *server, int seconds) {
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grpc_pollset_worker worker;
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gpr_timespec deadline =
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gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC),
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gpr_time_from_seconds(seconds, GPR_TIMESPAN));
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grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
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gpr_mu_lock(GRPC_POLLSET_MU(&server->pollset));
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grpc_pollset_work(&exec_ctx, &server->pollset, &worker,
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gpr_now(GPR_CLOCK_MONOTONIC), deadline);
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gpr_mu_unlock(GRPC_POLLSET_MU(&server->pollset));
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grpc_exec_ctx_finish(&exec_ctx);
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}
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void reconnect_server_clear_timestamps(reconnect_server *server) {
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timestamp_list *new_head = server->head;
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while (server->head) {
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new_head = server->head->next;
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gpr_free(server->head);
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server->head = new_head;
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}
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server->tail = NULL;
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gpr_free(server->peer);
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server->peer = NULL;
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}
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static void do_nothing(grpc_exec_ctx *exec_ctx, void *ignored, int success) {}
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void reconnect_server_destroy(reconnect_server *server) {
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grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
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grpc_closure do_nothing_closure[2];
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grpc_closure_init(&do_nothing_closure[0], do_nothing, NULL);
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grpc_closure_init(&do_nothing_closure[1], do_nothing, NULL);
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grpc_tcp_server_destroy(&exec_ctx, server->tcp_server,
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&do_nothing_closure[0]);
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reconnect_server_clear_timestamps(server);
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grpc_pollset_shutdown(&exec_ctx, &server->pollset, &do_nothing_closure[1]);
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grpc_exec_ctx_finish(&exec_ctx);
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grpc_pollset_destroy(&server->pollset);
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grpc_shutdown();
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}
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