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efa94c5735
tryGet() created an Entry object that referenced a Connection, but then deleted the Connection just before the Entry went out of scope.
343 lines
10 KiB
C++
343 lines
10 KiB
C++
#if __has_include(<mysql.h>)
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#include <mysql.h>
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#include <mysqld_error.h>
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#else
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#include <mysql/mysql.h>
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#include <mysql/mysqld_error.h>
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#endif
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#include <mysqlxx/Pool.h>
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#include <common/sleep.h>
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#include <Poco/Util/LayeredConfiguration.h>
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namespace mysqlxx
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{
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void Pool::Entry::incrementRefCount()
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{
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if (!data)
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return;
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/// First reference, initialize thread
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if (data->ref_count.fetch_add(1) == 0)
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mysql_thread_init();
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}
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void Pool::Entry::decrementRefCount()
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{
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if (!data)
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return;
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/// We were the last user of this thread, deinitialize it
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if (data->ref_count.fetch_sub(1) == 1)
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mysql_thread_end();
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}
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Pool::Pool(const Poco::Util::AbstractConfiguration & cfg, const std::string & config_name,
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unsigned default_connections_, unsigned max_connections_,
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const char * parent_config_name_)
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: logger(Poco::Logger::get("mysqlxx::Pool"))
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, default_connections(default_connections_)
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, max_connections(max_connections_)
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{
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server = cfg.getString(config_name + ".host");
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if (parent_config_name_)
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{
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const std::string parent_config_name(parent_config_name_);
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db = cfg.getString(config_name + ".db", cfg.getString(parent_config_name + ".db", ""));
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user = cfg.has(config_name + ".user")
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? cfg.getString(config_name + ".user")
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: cfg.getString(parent_config_name + ".user");
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password = cfg.has(config_name + ".password")
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? cfg.getString(config_name + ".password")
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: cfg.getString(parent_config_name + ".password");
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if (!cfg.has(config_name + ".port") && !cfg.has(config_name + ".socket")
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&& !cfg.has(parent_config_name + ".port") && !cfg.has(parent_config_name + ".socket"))
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throw Poco::Exception("mysqlxx::Pool configuration: expected port or socket");
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port = cfg.has(config_name + ".port")
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? cfg.getInt(config_name + ".port")
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: cfg.getInt(parent_config_name + ".port", 0);
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socket = cfg.has(config_name + ".socket")
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? cfg.getString(config_name + ".socket")
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: cfg.getString(parent_config_name + ".socket", "");
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ssl_ca = cfg.has(config_name + ".ssl_ca")
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? cfg.getString(config_name + ".ssl_ca")
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: cfg.getString(parent_config_name + ".ssl_ca", "");
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ssl_cert = cfg.has(config_name + ".ssl_cert")
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? cfg.getString(config_name + ".ssl_cert")
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: cfg.getString(parent_config_name + ".ssl_cert", "");
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ssl_key = cfg.has(config_name + ".ssl_key")
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? cfg.getString(config_name + ".ssl_key")
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: cfg.getString(parent_config_name + ".ssl_key", "");
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enable_local_infile = cfg.getBool(config_name + ".enable_local_infile",
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cfg.getBool(parent_config_name + ".enable_local_infile", MYSQLXX_DEFAULT_ENABLE_LOCAL_INFILE));
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opt_reconnect = cfg.getBool(config_name + ".opt_reconnect",
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cfg.getBool(parent_config_name + ".opt_reconnect", MYSQLXX_DEFAULT_MYSQL_OPT_RECONNECT));
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}
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else
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{
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db = cfg.getString(config_name + ".db", "");
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user = cfg.getString(config_name + ".user");
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password = cfg.getString(config_name + ".password");
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if (!cfg.has(config_name + ".port") && !cfg.has(config_name + ".socket"))
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throw Poco::Exception("mysqlxx::Pool configuration: expected port or socket");
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port = cfg.getInt(config_name + ".port", 0);
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socket = cfg.getString(config_name + ".socket", "");
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ssl_ca = cfg.getString(config_name + ".ssl_ca", "");
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ssl_cert = cfg.getString(config_name + ".ssl_cert", "");
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ssl_key = cfg.getString(config_name + ".ssl_key", "");
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enable_local_infile = cfg.getBool(
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config_name + ".enable_local_infile", MYSQLXX_DEFAULT_ENABLE_LOCAL_INFILE);
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opt_reconnect = cfg.getBool(config_name + ".opt_reconnect", MYSQLXX_DEFAULT_MYSQL_OPT_RECONNECT);
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}
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connect_timeout = cfg.getInt(config_name + ".connect_timeout",
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cfg.getInt("mysql_connect_timeout",
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MYSQLXX_DEFAULT_TIMEOUT));
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rw_timeout =
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cfg.getInt(config_name + ".rw_timeout",
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cfg.getInt("mysql_rw_timeout",
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MYSQLXX_DEFAULT_RW_TIMEOUT));
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}
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Pool::~Pool()
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{
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std::lock_guard<std::mutex> lock(mutex);
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for (auto & connection : connections)
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delete static_cast<Connection *>(connection);
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}
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Pool::Entry Pool::get()
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{
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std::unique_lock<std::mutex> lock(mutex);
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initialize();
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for (;;)
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{
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logger.trace("(%s): Iterating through existing MySQL connections", getDescription());
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for (auto & connection : connections)
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{
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if (connection->ref_count == 0)
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return Entry(connection, this);
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}
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logger.trace("(%s): Trying to allocate a new connection.", getDescription());
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if (connections.size() < static_cast<size_t>(max_connections))
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{
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Connection * conn = allocConnection();
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if (conn)
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return Entry(conn, this);
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logger.trace("(%s): Unable to create a new connection: Allocation failed.", getDescription());
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}
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else
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{
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logger.trace("(%s): Unable to create a new connection: Max number of connections has been reached.", getDescription());
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}
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lock.unlock();
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logger.trace("(%s): Sleeping for %d seconds.", getDescription(), MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL);
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sleepForSeconds(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL);
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lock.lock();
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}
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}
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Pool::Entry Pool::tryGet()
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{
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std::lock_guard<std::mutex> lock(mutex);
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initialize();
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/// Try to pick an idle connection from already allocated
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for (auto connection_it = connections.cbegin(); connection_it != connections.cend();)
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{
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Connection * connection_ptr = *connection_it;
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/// Fixme: There is a race condition here b/c we do not synchronize with Pool::Entry's copy-assignment operator
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if (connection_ptr->ref_count == 0)
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{
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{
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Entry res(connection_ptr, this);
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if (res.tryForceConnected()) /// Tries to reestablish connection as well
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return res;
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}
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logger.debug("(%s): Idle connection to MySQL server cannot be recovered, dropping it.", getDescription());
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/// This one is disconnected, cannot be reestablished and so needs to be disposed of.
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connection_it = connections.erase(connection_it);
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::delete connection_ptr; /// TODO: Manual memory management is awkward (matches allocConnection() method)
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}
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else
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++connection_it;
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}
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if (connections.size() >= max_connections)
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throw Poco::Exception("mysqlxx::Pool is full");
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Connection * connection_ptr = allocConnection(true);
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if (connection_ptr)
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return {connection_ptr, this};
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return {};
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}
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void Pool::removeConnection(Connection* connection)
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{
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logger.trace("(%s): Removing connection.", getDescription());
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std::lock_guard<std::mutex> lock(mutex);
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if (connection)
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{
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if (connection->ref_count > 0)
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{
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connection->conn.disconnect();
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connection->ref_count = 0;
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}
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connections.remove(connection);
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}
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}
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void Pool::Entry::disconnect()
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{
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pool->removeConnection(data);
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}
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void Pool::Entry::forceConnected() const
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{
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if (data == nullptr)
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throw Poco::RuntimeException("Tried to access NULL database connection.");
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bool first = true;
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while (!tryForceConnected())
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{
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if (first)
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first = false;
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else
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sleepForSeconds(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL);
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pool->logger.debug("Entry: Reconnecting to MySQL server %s", pool->description);
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data->conn.connect(
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pool->db.c_str(),
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pool->server.c_str(),
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pool->user.c_str(),
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pool->password.c_str(),
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pool->port,
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pool->socket.c_str(),
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pool->ssl_ca.c_str(),
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pool->ssl_cert.c_str(),
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pool->ssl_key.c_str(),
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pool->connect_timeout,
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pool->rw_timeout,
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pool->enable_local_infile,
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pool->opt_reconnect);
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}
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}
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bool Pool::Entry::tryForceConnected() const
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{
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auto * const mysql_driver = data->conn.getDriver();
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const auto prev_connection_id = mysql_thread_id(mysql_driver);
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pool->logger.trace("Entry(connection %lu): sending PING to check if it is alive.", prev_connection_id);
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if (data->conn.ping()) /// Attempts to reestablish lost connection
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{
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const auto current_connection_id = mysql_thread_id(mysql_driver);
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if (prev_connection_id != current_connection_id)
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{
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pool->logger.debug("Entry(connection %lu): Reconnected to MySQL server. Connection id changed: %lu -> %lu",
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current_connection_id, prev_connection_id, current_connection_id);
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}
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pool->logger.trace("Entry(connection %lu): PING ok.", current_connection_id);
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return true;
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}
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pool->logger.trace("Entry(connection %lu): PING failed.", prev_connection_id);
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return false;
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}
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void Pool::initialize()
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{
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if (!initialized)
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{
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description = db + "@" + server + ":" + std::to_string(port) + " as user " + user;
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for (unsigned i = 0; i < default_connections; ++i)
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allocConnection();
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initialized = true;
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}
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}
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Pool::Connection * Pool::allocConnection(bool dont_throw_if_failed_first_time)
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{
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std::unique_ptr<Connection> conn_ptr{new Connection};
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try
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{
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logger.debug("Connecting to %s", description);
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conn_ptr->conn.connect(
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db.c_str(),
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server.c_str(),
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user.c_str(),
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password.c_str(),
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port,
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socket.c_str(),
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ssl_ca.c_str(),
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ssl_cert.c_str(),
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ssl_key.c_str(),
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connect_timeout,
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rw_timeout,
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enable_local_infile,
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opt_reconnect);
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}
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catch (mysqlxx::ConnectionFailed & e)
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{
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logger.error(e.what());
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if ((!was_successful && !dont_throw_if_failed_first_time)
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|| e.errnum() == ER_ACCESS_DENIED_ERROR
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|| e.errnum() == ER_DBACCESS_DENIED_ERROR
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|| e.errnum() == ER_BAD_DB_ERROR)
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{
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throw;
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}
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else
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{
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return nullptr;
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}
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}
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connections.push_back(conn_ptr.get());
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was_successful = true;
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return conn_ptr.release();
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}
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}
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