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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2025 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef POSTGIS_CONNECTION_MANAGER_HPP
#define POSTGIS_CONNECTION_MANAGER_HPP
#include "connection.hpp"
// mapnik
#include <mapnik/params.hpp>
#include <mapnik/pool.hpp>
#include <mapnik/util/singleton.hpp>
// stl
#include <string>
#include <memory>
#include <optional>
using mapnik::CreateStatic;
using mapnik::Pool;
using mapnik::singleton;
template<typename T>
class ConnectionCreator
{
public:
ConnectionCreator(mapnik::parameters const& params)
: host_{params.get<std::string>("host")},
port_{params.get<std::string>("port")},
dbname_{params.get<std::string>("dbname")},
user_{params.get<std::string>("user")},
password_{params.get<std::string>("password")},
connect_timeout_{params.get<std::string>("connect_timeout", "4")},
application_name_{params.get<std::string>("application_name")}
{}
T* operator()() const { return new T(connection_string_safe(), password_); }
inline std::string id() const { return connection_string_safe(); }
inline std::string connection_string() const
{
std::string connect_str = connection_string_safe();
append_param(connect_str, "password=", password_);
return connect_str;
}
inline std::string connection_string_safe() const
{
std::string connect_str;
append_param(connect_str, "host=", host_);
append_param(connect_str, "port=", port_);
append_param(connect_str, "dbname=", dbname_);
append_param(connect_str, "user=", user_);
append_param(connect_str, "connect_timeout=", connect_timeout_);
if (!append_param(connect_str, "application_name=", application_name_))
{
// only set fallback_application_name, so that application_name
// can still be overriden with PGAPPNAME environment variable
append_param(connect_str, "fallback_application_name=", std::string{"mapnik"});
}
return connect_str;
}
private:
static bool append_param(std::string& dest, char const* key, std::string const& val)
{
if (val.empty())
return false;
if (!dest.empty())
dest += ' ';
dest += key;
dest += val;
return true;
}
static bool append_param(std::string& dest, char const* key, std::optional<std::string> const& opt)
{
return opt && append_param(dest, key, *opt);
}
std::optional<std::string> host_;
std::optional<std::string> port_;
std::optional<std::string> dbname_;
std::optional<std::string> user_;
std::optional<std::string> password_;
std::optional<std::string> connect_timeout_;
std::optional<std::string> application_name_;
};
class ConnectionManager : public singleton<ConnectionManager, CreateStatic>
{
public:
using PoolType = Pool<Connection, ConnectionCreator>;
private:
friend class CreateStatic<ConnectionManager>;
using ContType = std::map<std::string, std::shared_ptr<PoolType>>;
using HolderType = std::shared_ptr<Connection>;
ContType pools_;
public:
bool registerPool(ConnectionCreator<Connection> const& creator, unsigned initialSize, unsigned maxSize)
{
#ifdef MAPNIK_THREADSAFE
std::lock_guard<std::mutex> lock(mutex_);
#endif
ContType::const_iterator itr = pools_.find(creator.id());
if (itr != pools_.end())
{
itr->second->set_initial_size(initialSize);
itr->second->set_max_size(maxSize);
}
else
{
return pools_
.insert(std::make_pair(creator.id(), std::make_shared<PoolType>(creator, initialSize, maxSize)))
.second;
}
return false;
}
std::shared_ptr<PoolType> getPool(std::string const& key)
{
#ifdef MAPNIK_THREADSAFE
std::lock_guard<std::mutex> lock(mutex_);
#endif
ContType::const_iterator itr = pools_.find(key);
if (itr != pools_.end())
{
return itr->second;
}
static std::shared_ptr<PoolType> const emptyPool;
return emptyPool;
}
ConnectionManager() {}
private:
ConnectionManager(ConnectionManager const&);
ConnectionManager& operator=(ConnectionManager const);
};
#endif // POSTGIS_CONNECTION_MANAGER_HPP
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