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https://github.com/ClickHouse/ClickHouse.git
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446 lines
12 KiB
C++
446 lines
12 KiB
C++
#pragma once
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#include <list>
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#include <mysql/mysqld_error.h>
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#include <Poco/Util/Application.h>
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#include <Poco/Util/LayeredConfiguration.h>
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#include <Poco/NumberFormatter.h>
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#include <Poco/Mutex.h>
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#include <Poco/Exception.h>
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#include <Poco/SharedPtr.h>
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#include <common/logger_useful.h>
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#include <statdaemons/daemon.h>
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#include <mysqlxx/Connection.h>
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#define MYSQLXX_POOL_DEFAULT_START_CONNECTIONS 1
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#define MYSQLXX_POOL_DEFAULT_MAX_CONNECTIONS 16
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#define MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL 10
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namespace mysqlxx
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{
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/** Пул соединений с MySQL.
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* Этот класс имеет мало отношения к mysqlxx и сделан не в стиле библиотеки. (взят из старого кода)
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* Использование:
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* mysqlxx::Pool pool("mysql_params");
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*
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* void thread()
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* {
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* mysqlxx::Pool::Entry connection = pool.Get();
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* std::string s = connection->query("SELECT 'Hello, world!' AS world").use().fetch()["world"].getString();
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* }
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*
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* TODO: Упростить, используя PoolBase.
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*/
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class Pool final
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{
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protected:
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/** Информация о соединении. */
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struct Connection
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{
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Connection() : ref_count(0) {}
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mysqlxx::Connection conn;
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int ref_count;
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};
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public:
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/** Соединение с базой данных. */
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class Entry
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{
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public:
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Entry() {}
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Entry(const Entry & src)
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: data(src.data), pool(src.pool)
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{
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incrementRefCount();
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}
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~Entry()
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{
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decrementRefCount();
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}
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Entry & operator= (const Entry & src)
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{
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pool = src.pool;
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if (data)
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decrementRefCount();
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data = src.data;
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if (data)
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incrementRefCount();
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return * this;
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}
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bool isNull() const
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{
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return data == nullptr;
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}
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operator mysqlxx::Connection & ()
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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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forceConnected();
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return data->conn;
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}
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operator const mysqlxx::Connection & () 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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forceConnected();
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return data->conn;
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}
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const mysqlxx::Connection * operator->() 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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forceConnected();
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return &data->conn;
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}
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mysqlxx::Connection * operator->()
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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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forceConnected();
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return &data->conn;
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}
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Entry(Pool::Connection * conn, Pool * p)
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: data(conn), pool(p)
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{
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incrementRefCount();
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}
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std::string getDescription() const
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{
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if (pool)
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return pool->getDescription();
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else
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return "pool is null";
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}
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friend class Pool;
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private:
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/** Указатель на соединение. */
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Connection * data = nullptr;
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/** Указатель на пул, которому мы принадлежим. */
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Pool * pool = nullptr;
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/** Переподключается к базе данных в случае необходимости. Если не удалось - подождать и попробовать снова. */
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void forceConnected() const
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{
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Poco::Util::Application & app = Poco::Util::Application::instance();
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if (data->conn.ping())
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return;
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bool first = true;
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do
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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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Daemon::instance().sleep(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL);
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app.logger().information("MYSQL: Reconnecting to " + 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->connect_timeout,
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pool->rw_timeout);
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}
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while (!data->conn.ping());
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}
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/** Переподключается к базе данных в случае необходимости. Если не удалось - вернуть false. */
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bool tryForceConnected() const
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{
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return data->conn.ping();
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}
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void incrementRefCount()
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{
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if (!data)
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return;
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++data->ref_count;
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my_thread_init();
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}
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void decrementRefCount()
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{
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if (!data)
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return;
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--data->ref_count;
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my_thread_end();
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}
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};
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Pool(const std::string & config_name,
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unsigned default_connections_ = MYSQLXX_POOL_DEFAULT_START_CONNECTIONS,
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unsigned max_connections_ = MYSQLXX_POOL_DEFAULT_MAX_CONNECTIONS,
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const char * parent_config_name_ = nullptr)
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: Pool{
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Poco::Util::Application::instance().config(), config_name,
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default_connections_, max_connections_, parent_config_name_
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}
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{}
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/**
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* @param config_name Имя параметра в конфигурационном файле
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* @param default_connections_ Количество подключений по-умолчанию
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* @param max_connections_ Максимальное количество подключений
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*/
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Pool(const Poco::Util::AbstractConfiguration & cfg, const std::string & config_name,
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unsigned default_connections_ = MYSQLXX_POOL_DEFAULT_START_CONNECTIONS,
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unsigned max_connections_ = MYSQLXX_POOL_DEFAULT_MAX_CONNECTIONS,
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const char * parent_config_name_ = nullptr)
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: default_connections(default_connections_), 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") : 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") : cfg.getString(parent_config_name + ".password");
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port = cfg.has(config_name + ".port") ? cfg.getInt(config_name + ".port") :
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cfg.getInt(parent_config_name + ".port");
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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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port = cfg.getInt(config_name + ".port");
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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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/**
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* @param db_ Имя БД
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* @param server_ Хост для подключения
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* @param user_ Имя пользователя
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* @param password_ Пароль
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* @param port_ Порт для подключения
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* @param default_connections_ Количество подключений по-умолчанию
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* @param max_connections_ Максимальное количество подключений
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*/
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Pool(const std::string & db_,
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const std::string & server_,
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const std::string & user_ = "",
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const std::string & password_ = "",
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unsigned port_ = 0,
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unsigned connect_timeout_ = MYSQLXX_DEFAULT_TIMEOUT,
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unsigned rw_timeout_ = MYSQLXX_DEFAULT_RW_TIMEOUT,
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unsigned default_connections_ = MYSQLXX_POOL_DEFAULT_START_CONNECTIONS,
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unsigned max_connections_ = MYSQLXX_POOL_DEFAULT_MAX_CONNECTIONS)
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: default_connections(default_connections_), max_connections(max_connections_),
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db(db_), server(server_), user(user_), password(password_), port(port_),
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connect_timeout(connect_timeout_), rw_timeout(rw_timeout_) {}
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Pool(const Pool & other)
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: default_connections{other.default_connections},
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max_connections{other.max_connections},
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db{other.db}, server{other.server},
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user{other.user}, password{other.password},
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port{other.port}, connect_timeout{other.connect_timeout},
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rw_timeout{other.rw_timeout}
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{}
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Pool & operator=(const Pool &) = delete;
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~Pool()
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{
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Poco::ScopedLock<Poco::FastMutex> locker(lock);
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for (Connections::iterator it = connections.begin(); it != connections.end(); it++)
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delete static_cast<Connection *>(*it);
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}
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/** Выделяет соединение для работы. */
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Entry Get()
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{
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Poco::ScopedLock<Poco::FastMutex> locker(lock);
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initialize();
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for (;;)
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{
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for (Connections::iterator it = connections.begin(); it != connections.end(); it++)
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{
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if ((*it)->ref_count == 0)
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return Entry(*it, this);
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}
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if (connections.size() < (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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}
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lock.unlock();
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Daemon::instance().sleep(MYSQLXX_POOL_SLEEP_ON_CONNECT_FAIL);
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lock.lock();
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}
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}
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/** Выделяет соединение для работы.
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* Если база недоступна - возвращает пустой объект Entry.
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* Если пул переполнен - кидает исключение.
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*/
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Entry tryGet()
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{
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Poco::ScopedLock<Poco::FastMutex> locker(lock);
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initialize();
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/// Поиск уже установленного, но не использующегося сейчас соединения.
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for (Connections::iterator it = connections.begin(); it != connections.end(); ++it)
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{
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if ((*it)->ref_count == 0)
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{
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Entry res(*it, this);
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return res.tryForceConnected() ? res : Entry();
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}
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}
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/// Если пул переполнен.
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if (connections.size() >= max_connections)
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throw Poco::Exception("mysqlxx::Pool is full");
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/// Выделение нового соединения.
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Connection * conn = allocConnection(true);
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if (conn)
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return Entry(conn, this);
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return Entry();
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}
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/// Получить описание БД
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std::string getDescription() const
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{
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return description;
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}
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protected:
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/** Количество соединений с MySQL, создаваемых при запуске. */
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unsigned default_connections;
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/** Максимально возможное количество соедиений. */
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unsigned max_connections;
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private:
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/** Признак того, что мы инициализированы. */
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bool initialized{false};
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/** Список соединений. */
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typedef std::list<Connection *> Connections;
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/** Список соединений. */
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Connections connections;
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/** Замок для доступа к списку соединений. */
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Poco::FastMutex lock;
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/** Описание соединения. */
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std::string description;
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/** Параметры подключения. **/
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std::string db;
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std::string server;
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std::string user;
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std::string password;
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unsigned port;
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unsigned connect_timeout;
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unsigned rw_timeout;
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/** Хотя бы один раз было успешное соединение. */
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bool was_successful{false};
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/** Выполняет инициализацию класса, если мы еще не инициализированы. */
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void initialize()
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{
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if (!initialized)
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{
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description = db + "@" + server + ":" + Poco::NumberFormatter::format(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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/** Создает новое соединение. */
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Connection * allocConnection(bool dont_throw_if_failed_first_time = false)
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{
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Poco::Util::Application & app = Poco::Util::Application::instance();
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Connection * conn;
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conn = new Connection();
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try
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{
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app.logger().information("MYSQL: Connecting to " + description);
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conn->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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connect_timeout,
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rw_timeout);
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}
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catch (mysqlxx::ConnectionFailed & e)
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{
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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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app.logger().error(e.what());
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throw;
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}
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else
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{
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app.logger().error(e.what());
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delete conn;
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if (Daemon::instance().isCancelled())
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throw Poco::Exception("Daemon is cancelled while trying to connect to MySQL server.");
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return nullptr;
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}
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}
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was_successful = true;
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connections.push_back(conn);
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return conn;
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}
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};
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}
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