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/* Copyright 2018 Codership Oy <info@codership.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mariadb.h"
#include "mysql/service_wsrep.h"
#include "wsrep/key.hpp"
#include "wsrep_thd.h"
#include "wsrep_trans_observer.h"
#include "sql_class.h"
#include "debug_sync.h"
extern "C" my_bool wsrep_on(const THD *thd)
{
return my_bool(WSREP(thd));
}
extern "C" void wsrep_thd_LOCK(const THD *thd)
{
mysql_mutex_lock(&thd->LOCK_thd_data);
}
extern "C" void wsrep_thd_UNLOCK(const THD *thd)
{
mysql_mutex_unlock(&thd->LOCK_thd_data);
}
extern "C" const char* wsrep_thd_client_state_str(const THD *thd)
{
return wsrep::to_c_string(thd->wsrep_cs().state());
}
extern "C" const char* wsrep_thd_client_mode_str(const THD *thd)
{
return wsrep::to_c_string(thd->wsrep_cs().mode());
}
extern "C" const char* wsrep_thd_transaction_state_str(const THD *thd)
{
return wsrep::to_c_string(thd->wsrep_cs().transaction().state());
}
extern "C" const char *wsrep_thd_query(const THD *thd)
{
return thd ? thd->query() : NULL;
}
extern "C" query_id_t wsrep_thd_transaction_id(const THD *thd)
{
return thd->wsrep_cs().transaction().id().get();
}
extern "C" long long wsrep_thd_trx_seqno(const THD *thd)
{
const wsrep::client_state& cs= thd->wsrep_cs();
if (cs.mode() == wsrep::client_state::m_toi)
{
return cs.toi_meta().seqno().get();
}
else
{
return cs.transaction().ws_meta().seqno().get();
}
}
extern "C" void wsrep_thd_self_abort(THD *thd)
{
thd->wsrep_cs().bf_abort(wsrep::seqno(0));
}
extern "C" const char* wsrep_get_sr_table_name()
{
return wsrep_sr_table_name_full;
}
extern "C" my_bool wsrep_get_debug()
{
return wsrep_debug;
}
extern "C" my_bool wsrep_thd_is_local(const THD *thd)
{
return thd->wsrep_cs().mode() == wsrep::client_state::m_local;
}
extern "C" my_bool wsrep_thd_is_applying(const THD *thd)
{
return thd->wsrep_cs().mode() == wsrep::client_state::m_high_priority;
}
extern "C" my_bool wsrep_thd_is_toi(const THD *thd)
{
return thd->wsrep_cs().mode() == wsrep::client_state::m_toi;
}
extern "C" my_bool wsrep_thd_is_local_toi(const THD *thd)
{
return thd->wsrep_cs().mode() == wsrep::client_state::m_toi &&
thd->wsrep_cs().toi_mode() == wsrep::client_state::m_local;
}
extern "C" my_bool wsrep_thd_is_in_rsu(const THD *thd)
{
return thd->wsrep_cs().mode() == wsrep::client_state::m_rsu;
}
extern "C" my_bool wsrep_thd_is_BF(const THD *thd, my_bool sync)
{
my_bool status = FALSE;
if (thd && WSREP(thd))
{
if (sync) mysql_mutex_lock(&thd->LOCK_thd_data);
status = (wsrep_thd_is_applying(thd) || wsrep_thd_is_toi(thd));
if (sync) mysql_mutex_unlock(&thd->LOCK_thd_data);
}
return status;
}
extern "C" my_bool wsrep_thd_is_SR(const THD *thd)
{
return thd && thd->wsrep_cs().transaction().is_streaming();
}
extern "C" void wsrep_handle_SR_rollback(THD *bf_thd,
THD *victim_thd)
{
DBUG_ASSERT(victim_thd);
if (!victim_thd || !wsrep_on(bf_thd)) return;
WSREP_DEBUG("handle rollback, for deadlock: thd %llu trx_id %lu frags %lu conf %s",
victim_thd->thread_id,
victim_thd->wsrep_trx_id(),
victim_thd->wsrep_sr().fragments_certified(),
wsrep_thd_transaction_state_str(victim_thd));
if (bf_thd) victim_thd->store_globals();
if (!bf_thd)
{
DEBUG_SYNC(victim_thd, "wsrep_before_SR_rollback");
}
if (bf_thd)
{
wsrep_bf_abort(bf_thd, victim_thd);
}
else
{
wsrep_thd_self_abort(victim_thd);
}
if (bf_thd) bf_thd->store_globals();
}
extern "C" my_bool wsrep_thd_bf_abort(const THD *bf_thd, THD *victim_thd,
my_bool signal)
{
if (WSREP(victim_thd) && !victim_thd->wsrep_trx().active())
{
WSREP_DEBUG("BF abort for non active transaction");
wsrep_start_transaction(victim_thd, victim_thd->wsrep_next_trx_id());
}
my_bool ret= wsrep_bf_abort(bf_thd, victim_thd);
/*
Send awake signal if victim was BF aborted or does not
have wsrep on. Note that this should never interrupt RSU
as RSU has paused the provider.
*/
if ((ret || !wsrep_on(victim_thd)) && signal)
victim_thd->awake(KILL_QUERY);
return ret;
}
extern "C" my_bool wsrep_thd_skip_locking(const THD *thd)
{
return thd && thd->wsrep_skip_locking;
}
extern "C" my_bool wsrep_thd_order_before(const THD *left, const THD *right)
{
if (wsrep_thd_trx_seqno(left) < wsrep_thd_trx_seqno(right)) {
WSREP_DEBUG("BF conflict, order: %lld %lld\n",
(long long)wsrep_thd_trx_seqno(left),
(long long)wsrep_thd_trx_seqno(right));
return TRUE;
}
WSREP_DEBUG("waiting for BF, trx order: %lld %lld\n",
(long long)wsrep_thd_trx_seqno(left),
(long long)wsrep_thd_trx_seqno(right));
return FALSE;
}
extern "C" my_bool wsrep_thd_is_aborting(const MYSQL_THD thd)
{
mysql_mutex_assert_owner(&thd->LOCK_thd_data);
if (thd != 0)
{
const wsrep::client_state& cs(thd->wsrep_cs());
const enum wsrep::transaction::state tx_state(cs.transaction().state());
switch (tx_state)
{
case wsrep::transaction::s_must_abort:
return (cs.state() == wsrep::client_state::s_exec ||
cs.state() == wsrep::client_state::s_result);
case wsrep::transaction::s_aborting:
case wsrep::transaction::s_aborted:
return true;
default:
return false;
}
}
return false;
}
static inline enum wsrep::key::type
map_key_type(enum Wsrep_service_key_type type)
{
switch (type)
{
case WSREP_SERVICE_KEY_SHARED: return wsrep::key::shared;
case WSREP_SERVICE_KEY_REFERENCE: return wsrep::key::reference;
case WSREP_SERVICE_KEY_UPDATE: return wsrep::key::update;
case WSREP_SERVICE_KEY_EXCLUSIVE: return wsrep::key::exclusive;
}
return wsrep::key::exclusive;
}
extern "C" int wsrep_thd_append_key(THD *thd,
const struct wsrep_key* key,
int n_keys,
enum Wsrep_service_key_type key_type)
{
Wsrep_client_state& client_state(thd->wsrep_cs());
DBUG_ASSERT(client_state.transaction().active());
int ret= 0;
for (int i= 0; i < n_keys && ret == 0; ++i)
{
wsrep::key wsrep_key(map_key_type(key_type));
for (size_t kp= 0; kp < key[i].key_parts_num; ++kp)
{
wsrep_key.append_key_part(key[i].key_parts[kp].ptr, key[i].key_parts[kp].len);
}
ret= client_state.append_key(wsrep_key);
}
return ret;
}
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