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/*
* Copyright (C) 2018 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib 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, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#include "db_client.hpp"
#include "db_server.hpp"
#include "wsrep/logger.hpp"
db::client::client(db::server& server,
wsrep::client_id client_id,
enum wsrep::client_state::mode mode,
const db::params& params)
: mutex_()
, cond_()
, params_(params)
, server_(server)
, server_state_(server.server_state())
, client_state_(mutex_, cond_, server_state_, client_service_, client_id, mode)
, client_service_(*this)
, se_trx_(server.storage_engine())
, data_()
, random_device_()
, random_engine_(random_device_())
, stats_()
{
data_.resize(params.max_data_size);
}
void db::client::start()
{
client_state_.open(client_state_.id());
for (size_t i(0); i < params_.n_transactions; ++i)
{
run_one_transaction();
report_progress(i + 1);
}
client_state_.close();
client_state_.cleanup();
}
bool db::client::bf_abort(wsrep::seqno seqno)
{
return client_state_.bf_abort(seqno);
}
////////////////////////////////////////////////////////////////////////////////
// Private //
////////////////////////////////////////////////////////////////////////////////
template <class F>
int db::client::client_command(F f)
{
int err(client_state_.before_command());
// wsrep::log_debug() << "before_command: " << err;
// If err != 0, transaction was BF aborted while client idle
if (err == 0)
{
err = client_state_.before_statement();
if (err == 0)
{
err = f();
}
client_state_.after_statement();
}
client_state_.after_command_before_result();
if (client_state_.current_error())
{
// wsrep::log_info() << "Current error";
assert(client_state_.transaction().state() ==
wsrep::transaction::s_aborted);
err = 1;
}
client_state_.after_command_after_result();
// wsrep::log_info() << "client_command(): " << err;
return err;
}
void db::client::run_one_transaction()
{
if (params_.sync_wait)
{
if (client_state_.sync_wait(5))
{
throw wsrep::runtime_error("Sync wait failed");
}
}
client_state_.reset_error();
int err = client_command(
[&]()
{
// wsrep::log_debug() << "Start transaction";
err = client_state_.start_transaction(
wsrep::transaction_id(server_.next_transaction_id()));
assert(err == 0);
se_trx_.start(this);
return err;
});
const wsrep::transaction& transaction(
client_state_.transaction());
err = err || client_command(
[&]()
{
// wsrep::log_debug() << "Generate write set";
assert(transaction.active());
assert(err == 0);
std::uniform_int_distribution<size_t> uniform_dist(0, params_.n_rows);
const size_t randkey(uniform_dist(random_engine_));
::memcpy(data_.data(), &randkey,
std::min(sizeof(randkey), data_.size()));
wsrep::key key(wsrep::key::exclusive);
key.append_key_part("dbms", 4);
unsigned long long client_key(client_state_.id().get());
key.append_key_part(&client_key, sizeof(client_key));
key.append_key_part(&randkey, sizeof(randkey));
err = client_state_.append_key(key);
size_t bytes_to_append(data_.size());
if (params_.random_data_size)
{
bytes_to_append = std::uniform_int_distribution<size_t>(
1, data_.size())(random_engine_);
}
err = err || client_state_.append_data(
wsrep::const_buffer(data_.data(), bytes_to_append));
return err;
});
err = err || client_command(
[&]()
{
// wsrep::log_debug() << "Commit";
assert(err == 0);
if (do_2pc())
{
err = err || client_state_.before_prepare();
err = err || client_state_.after_prepare();
}
err = err || client_state_.before_commit();
if (err == 0) se_trx_.commit(transaction.ws_meta().gtid());
err = err || client_state_.ordered_commit();
err = err || client_state_.after_commit();
if (err)
{
client_state_.before_rollback();
se_trx_.rollback();
client_state_.after_rollback();
}
return err;
});
assert(err ||
transaction.state() == wsrep::transaction::s_aborted ||
transaction.state() == wsrep::transaction::s_committed);
assert(se_trx_.active() == false);
assert(transaction.active() == false);
switch (transaction.state())
{
case wsrep::transaction::s_committed:
++stats_.commits;
break;
case wsrep::transaction::s_aborted:
++stats_.rollbacks;
break;
default:
assert(0);
}
}
void db::client::report_progress(size_t i) const
{
if ((i % 1000) == 0)
{
wsrep::log_info() << "client: " << client_state_.id().get()
<< " transactions: " << i
<< " " << 100*double(i)/double(params_.n_transactions) << "%";
}
}
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