mirror of https://github.com/yandex/odyssey.git
163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
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/*
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* Odyssey.
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*
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* Scalable PostgreSQL connection pooler.
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*/
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <signal.h>
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#include <machinarium.h>
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#include <shapito.h>
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#include "sources/macro.h"
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#include "sources/version.h"
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#include "sources/atomic.h"
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#include "sources/util.h"
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#include "sources/error.h"
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#include "sources/list.h"
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#include "sources/pid.h"
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#include "sources/id.h"
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#include "sources/logger.h"
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#include "sources/daemon.h"
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#include "sources/config.h"
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#include "sources/config_reader.h"
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#include "sources/msg.h"
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#include "sources/global.h"
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#include "sources/server.h"
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#include "sources/server_pool.h"
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#include "sources/client.h"
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#include "sources/client_pool.h"
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#include "sources/route_id.h"
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#include "sources/route.h"
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#include "sources/route_pool.h"
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#include "sources/io.h"
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#include "sources/instance.h"
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#include "sources/router_cancel.h"
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#include "sources/router.h"
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#include "sources/system.h"
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#include "sources/worker.h"
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#include "sources/frontend.h"
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#include "sources/backend.h"
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#include "sources/reset.h"
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#include "sources/auth.h"
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#include "sources/tls.h"
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#include "sources/cancel.h"
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int od_reset(od_server_t *server, shapito_stream_t *stream)
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{
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od_instance_t *instance = server->global->instance;
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od_route_t *route = server->route;
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/* server left in copy mode */
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if (server->is_copy) {
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od_log(&instance->logger, "reset", server->client, server,
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"in copy, closing");
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goto drop;
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}
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/* support route rollback off */
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if (! route->config->pool_rollback) {
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if (server->is_transaction) {
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od_log(&instance->logger, "reset", server->client, server,
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"in active transaction, closing");
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goto drop;
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}
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}
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/* support route cancel off */
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if (! route->config->pool_cancel) {
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if (! od_server_sync_is(server)) {
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od_log(&instance->logger, "reset", server->client, server,
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"not synchronized, closing");
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goto drop;
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}
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}
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/* Server is not synchronized.
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*
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* Number of queries sent to server is not equal
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* to the number of received replies. Do the following
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* logic until server becomes synchronized:
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*
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* 1. Wait each ReadyForQuery until we receive all
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* replies with 1 sec timeout.
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*
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* 2. Send Cancel in other connection.
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*
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* It is possible that client could previously
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* pipeline server with requests. Each request
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* may stall database on its own way and may require
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* additional Cancel request.
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*
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* 3. Continue with (1)
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*/
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int wait_timeout = 1000;
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int wait_try = 0;
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int wait_try_cancel = 0;
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int wait_cancel_limit = 1;
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int rc = 0;
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for (;;) {
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while (! od_server_sync_is(server)) {
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od_log(&instance->logger, "reset", server->client, server,
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"not synchronized, wait for %d msec (#%d)",
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wait_timeout,
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wait_try);
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wait_try++;
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rc = od_backend_ready_wait(server, stream, "reset", 1, wait_timeout);
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if (rc == -1)
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break;
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}
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if (rc == -1) {
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if (! machine_timedout())
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goto error;
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if (wait_try_cancel == wait_cancel_limit) {
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od_error(&instance->logger, "reset", server->client, server,
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"server cancel limit reached, closing");
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goto error;
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}
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od_log(&instance->logger, "reset", server->client, server,
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"not responded, cancel (#%d)",
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wait_try_cancel);
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wait_try_cancel++;
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rc = od_cancel(server->global,
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stream,
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route->config->storage, &server->key,
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&server->id);
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if (rc == -1)
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goto error;
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continue;
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}
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assert(od_server_sync_is(server));
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break;
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}
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od_debug(&instance->logger, "reset", server->client, server,
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"synchronized");
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/* send rollback in case server has an active
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* transaction running */
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if (route->config->pool_rollback) {
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if (server->is_transaction) {
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char query_rlb[] = "ROLLBACK";
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rc = od_backend_query(server, stream, "reset rollback", query_rlb,
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sizeof(query_rlb));
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if (rc == -1)
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goto error;
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assert(! server->is_transaction);
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}
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}
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/* ready */
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return 1;
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drop:
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return 0;
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error:
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return -1;
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}
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