#if __has_include(<mysql.h>) #include <mysql.h> #include <mysqld_error.h> #else #include <mysql/mysql.h> #include <mysql/mysqld_error.h> #endif #include <mysqlxx/Pool.h> #include <common/sleep.h> #include <Poco/Util/Application.h> #include <Poco/Util/LayeredConfiguration.h> namespace mysqlxx { void Pool::Entry::incrementRefCount() { if (!data) return; /// First reference, initialize thread if (data->ref_count.fetch_add(1) == 0) mysql_thread_init(); } void Pool::Entry::decrementRefCount() { if (!data) return; /// We were the last user of this thread, deinitialize it if (data->ref_count.fetch_sub(1) == 1) mysql_thread_end(); } Pool::Pool(const Poco::Util::AbstractConfiguration & cfg, const std::string & config_name, unsigned default_connections_, unsigned max_connections_, const char * parent_config_name_) : default_connections(default_connections_), max_connections(max_connections_) { server = cfg.getString(config_name + ".host"); if (parent_config_name_) { const std::string parent_config_name(parent_config_name_); db = cfg.getString(config_name + ".db", cfg.getString(parent_config_name + ".db", "")); user = cfg.has(config_name + ".user") ? cfg.getString(config_name + ".user") : cfg.getString(parent_config_name + ".user"); password = cfg.has(config_name + ".password") ? cfg.getString(config_name + ".password") : cfg.getString(parent_config_name + ".password"); if (!cfg.has(config_name + ".port") && !cfg.has(config_name + ".socket") && !cfg.has(parent_config_name + ".port") && !cfg.has(parent_config_name + ".socket")) throw Poco::Exception("mysqlxx::Pool configuration: expected port or socket"); port = cfg.has(config_name + ".port") ? cfg.getInt(config_name + ".port") : cfg.getInt(parent_config_name + ".port", 0); socket = cfg.has(config_name + ".socket") ? cfg.getString(config_name + ".socket") : cfg.getString(parent_config_name + ".socket", ""); ssl_ca = cfg.has(config_name + ".ssl_ca") ? cfg.getString(config_name + ".ssl_ca") : cfg.getString(parent_config_name + ".ssl_ca", ""); ssl_cert = cfg.has(config_name + ".ssl_cert") ? cfg.getString(config_name + ".ssl_cert") : cfg.getString(parent_config_name + ".ssl_cert", ""); ssl_key = cfg.has(config_name + ".ssl_key") ? cfg.getString(config_name + ".ssl_key") : cfg.getString(parent_config_name + ".ssl_key", ""); enable_local_infile = cfg.getBool(config_name + ".enable_local_infile", cfg.getBool(parent_config_name + ".enable_local_infile", MYSQLXX_DEFAULT_ENABLE_LOCAL_INFILE)); } else { db = cfg.getString(config_name + ".db", ""); user = cfg.getString(config_name + ".user"); password = cfg.getString(config_name + ".password"); if (!cfg.has(config_name + ".port") && !cfg.has(config_name + ".socket")) throw Poco::Exception("mysqlxx::Pool configuration: expected port or socket"); port = cfg.getInt(config_name + ".port", 0); socket = cfg.getString(config_name + ".socket", ""); ssl_ca = cfg.getString(config_name + ".ssl_ca", ""); ssl_cert = cfg.getString(config_name + ".ssl_cert", ""); ssl_key = cfg.getString(config_name + ".ssl_key", ""); enable_local_infile = cfg.getBool( config_name + ".enable_local_infile", MYSQLXX_DEFAULT_ENABLE_LOCAL_INFILE); } connect_timeout = cfg.getInt(config_name + ".connect_timeout", cfg.getInt("mysql_connect_timeout", MYSQLXX_DEFAULT_TIMEOUT)); rw_timeout = cfg.getInt(config_name + ".rw_timeout", cfg.getInt("mysql_rw_timeout", MYSQLXX_DEFAULT_RW_TIMEOUT)); } Pool::~Pool() { std::lock_guard<std::mutex> lock(mutex); for (auto & connection : connections) delete static_cast<Connection *>(connection); } Pool::Entry Pool::get() { std::unique_lock<std::mutex> lock(mutex); initialize(); for (;;) { for (auto & connection : connections) { if (connection->ref_count == 0) return Entry(connection, this); } if (connections.size() < static_cast<size_t>(max_connections)) { Connection * conn = allocConnection(); if (conn) return Entry(conn, this); } lock.unlock(); sleepForSeconds(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL); lock.lock(); } } Pool::Entry Pool::tryGet() { std::lock_guard<std::mutex> lock(mutex); initialize(); /// Searching for connection which was established but wasn't used. for (auto & connection : connections) { if (connection->ref_count == 0) { Entry res(connection, this); return res.tryForceConnected() ? res : Entry(); } } /// Throws if pool is overflowed. if (connections.size() >= max_connections) throw Poco::Exception("mysqlxx::Pool is full"); /// Allocates new connection. Connection * conn = allocConnection(true); if (conn) return Entry(conn, this); return Entry(); } void Pool::removeConnection(Connection* connection) { std::lock_guard<std::mutex> lock(mutex); if (connection) { if (connection->ref_count > 0) { connection->conn.disconnect(); connection->ref_count = 0; } connections.remove(connection); } } void Pool::Entry::disconnect() { pool->removeConnection(data); } void Pool::Entry::forceConnected() const { if (data == nullptr) throw Poco::RuntimeException("Tried to access NULL database connection."); Poco::Util::Application & app = Poco::Util::Application::instance(); if (data->conn.ping()) return; bool first = true; do { if (first) first = false; else sleepForSeconds(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL); app.logger().information("MYSQL: Reconnecting to " + pool->description); data->conn.connect( pool->db.c_str(), pool->server.c_str(), pool->user.c_str(), pool->password.c_str(), pool->port, pool->socket.c_str(), pool->ssl_ca.c_str(), pool->ssl_cert.c_str(), pool->ssl_key.c_str(), pool->connect_timeout, pool->rw_timeout, pool->enable_local_infile); } while (!data->conn.ping()); } void Pool::initialize() { if (!initialized) { description = db + "@" + server + ":" + std::to_string(port) + " as user " + user; for (unsigned i = 0; i < default_connections; ++i) allocConnection(); initialized = true; } } Pool::Connection * Pool::allocConnection(bool dont_throw_if_failed_first_time) { Poco::Util::Application & app = Poco::Util::Application::instance(); std::unique_ptr<Connection> conn(new Connection); try { app.logger().information("MYSQL: Connecting to " + description); conn->conn.connect( db.c_str(), server.c_str(), user.c_str(), password.c_str(), port, socket.c_str(), ssl_ca.c_str(), ssl_cert.c_str(), ssl_key.c_str(), connect_timeout, rw_timeout, enable_local_infile); } catch (mysqlxx::ConnectionFailed & e) { if ((!was_successful && !dont_throw_if_failed_first_time) || e.errnum() == ER_ACCESS_DENIED_ERROR || e.errnum() == ER_DBACCESS_DENIED_ERROR || e.errnum() == ER_BAD_DB_ERROR) { app.logger().error(e.what()); throw; } else { app.logger().error(e.what()); return nullptr; } } was_successful = true; auto * connection = conn.release(); connections.push_back(connection); return connection; } }