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/*
* Copyright (c) 2013-2020, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef UTIL_H
#define UTIL_H
#include <string>
#include <functional>
#include <memory>
#include <mutex>
#include <thread>
#include <utility>
#include <boost/asio.hpp>
#ifdef ANDROID
#ifndef __clang__
#include <boost/lexical_cast.hpp>
namespace std
{
template <typename T>
std::string to_string(T value)
{
return boost::lexical_cast<std::string>(value);
}
inline int stoi(const std::string& str)
{
return boost::lexical_cast<int>(str);
}
}
#endif
#endif
namespace i2p
{
namespace util
{
template<class T>
class MemoryPool
{
//BOOST_STATIC_ASSERT_MSG(sizeof(T) >= sizeof(void*), "size cannot be less that general pointer size");
public:
MemoryPool (): m_Head (nullptr) {}
~MemoryPool ()
{
while (m_Head)
{
auto tmp = m_Head;
m_Head = static_cast<T*>(*(void * *)m_Head); // next
::operator delete ((void *)tmp);
}
}
template<typename... TArgs>
T * Acquire (TArgs&&... args)
{
if (!m_Head) return new T(std::forward<TArgs>(args)...);
else
{
auto tmp = m_Head;
m_Head = static_cast<T*>(*(void * *)m_Head); // next
return new (tmp)T(std::forward<TArgs>(args)...);
}
}
void Release (T * t)
{
if (!t) return;
t->~T ();
*(void * *)t = m_Head; // next
m_Head = t;
}
template<typename... TArgs>
std::unique_ptr<T, std::function<void(T*)> > AcquireUnique (TArgs&&... args)
{
return std::unique_ptr<T, std::function<void(T*)> >(Acquire (std::forward<TArgs>(args)...),
std::bind (&MemoryPool<T>::Release, this, std::placeholders::_1));
}
template<typename... TArgs>
std::shared_ptr<T> AcquireShared (TArgs&&... args)
{
return std::shared_ptr<T>(Acquire (std::forward<TArgs>(args)...),
std::bind (&MemoryPool<T>::Release, this, std::placeholders::_1));
}
protected:
T * m_Head;
};
template<class T>
class MemoryPoolMt: public MemoryPool<T>
{
public:
MemoryPoolMt () {}
template<typename... TArgs>
T * AcquireMt (TArgs&&... args)
{
if (!this->m_Head) return new T(std::forward<TArgs>(args)...);
std::lock_guard<std::mutex> l(m_Mutex);
return this->Acquire (std::forward<TArgs>(args)...);
}
void ReleaseMt (T * t)
{
std::lock_guard<std::mutex> l(m_Mutex);
this->Release (t);
}
template<template<typename, typename...>class C, typename... R>
void ReleaseMt(const C<T *, R...>& c)
{
std::lock_guard<std::mutex> l(m_Mutex);
for (auto& it: c)
this->Release (it);
}
private:
std::mutex m_Mutex;
};
class RunnableService
{
protected:
RunnableService (const std::string& name): m_Name (name), m_IsRunning (false) {}
virtual ~RunnableService () {}
boost::asio::io_service& GetIOService () { return m_Service; }
bool IsRunning () const { return m_IsRunning; };
void StartIOService ();
void StopIOService ();
private:
void Run ();
private:
std::string m_Name;
volatile bool m_IsRunning;
std::unique_ptr<std::thread> m_Thread;
boost::asio::io_service m_Service;
};
class RunnableServiceWithWork: public RunnableService
{
protected:
RunnableServiceWithWork (const std::string& name):
RunnableService (name), m_Work (GetIOService ()) {}
private:
boost::asio::io_service::work m_Work;
};
void SetThreadName (const char *name);
template<typename T>
class SaveStateHelper
{
public:
SaveStateHelper (T& orig): m_Original (orig), m_Copy (orig) {};
~SaveStateHelper () { m_Original = m_Copy; };
private:
T& m_Original;
T m_Copy;
};
namespace net
{
int GetMTU (const boost::asio::ip::address& localAddress);
const boost::asio::ip::address GetInterfaceAddress (const std::string & ifname, bool ipv6=false);
bool IsInReservedRange (const boost::asio::ip::address& host);
}
}
}
#endif