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Voodoo.h
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Voodoo.h
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#pragma once
#include <assert.h>
#include <any>
#include <functional>
#include <mutex>
#include <stdexcept>
#include <thread>
#include <SFML/Network.hpp>
namespace Voodoo {
/*
* ID class used for methods, interfaces and cleanup handlers
*/
class ID // FIXME: use lli::ID soon
{
private:
unsigned long long value;
public:
ID() : value(0) {}
ID(unsigned long long value) : value(value) {}
unsigned long long operator *() const { return value; }
bool operator < (const ID& other) const
{
return value < other.value;
}
bool operator !=(const ID& other) const
{
return value != other.value;
}
operator bool() const
{
return value != 0;
}
};
sf::Packet& operator <<(sf::Packet& packet, const ID& id);
sf::Packet& operator >>(sf::Packet& packet, ID& id);
/*
* Packet class holding our value type definition
*/
class Packet
{
public:
/*
* This defines the type of value for packet data
*/
typedef enum {
ID,
INT8,
UINT8,
INT16,
UINT16,
INT32,
UINT32,
INT64,
UINT64,
FLOAT32,
FLOAT64,
STRING,
DATA
} ValueType;
};
/*
* Base class for client and server classes
*/
class Host
{
private:
unsigned long long ids;
std::map<ID, std::function<std::any(std::vector<std::any>)>> methods;
std::map<ID, void*> interfaces;
public:
Host();
/*
* Generate a new ID for usage as method, interface or cleanup handler ID
*/
ID MakeID();
/*
* Register method for incoming calls. Generates a new ID using MakeID.
*/
ID Register(std::function<std::any(std::vector<std::any>)> handler);
void Unregister(ID id);
/*
* Register interface for later lookup as a resource being passed to a method.
*/
void RegisterInterface(ID id, void* _interface);
void UnregisterInterface(ID id);
void* LookupInterface(ID id);
/*
* Handle incoming call based on method ID.
*/
std::any Handle(ID id, std::vector<std::any> args);
protected:
/*
* Template function for data being appended to a packet
*
* Specializations will write type and value accordingly
*/
template <typename T>
void put_arg(sf::Packet& packet, T arg);
/*
* Append data to a packet.
*/
void any_to_packet(std::any value, sf::Packet& packet);
/*
* Get data from a packet.
*/
void get_values(sf::Packet& packet, std::vector<std::any>& values, size_t readStart = 0);
};
template <>
inline void Host::put_arg(sf::Packet& packet, ID arg)
{
packet << Packet::ID;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Int8 arg)
{
packet << Packet::INT8;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Uint8 arg)
{
packet << Packet::UINT8;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Int16 arg)
{
packet << Packet::INT16;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Uint16 arg)
{
packet << Packet::UINT16;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Int32 arg)
{
packet << Packet::INT32;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Uint32 arg)
{
packet << Packet::UINT32;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Int64 arg)
{
packet << Packet::INT64;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, sf::Uint64 arg)
{
packet << Packet::UINT64;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, unsigned long arg) // FIXME: check i386 case
{
packet << Packet::UINT64;
packet << (sf::Uint64)arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, float arg)
{
packet << Packet::FLOAT32;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, double arg)
{
packet << Packet::FLOAT64;
packet << arg;
}
template <>
inline void Host::put_arg(sf::Packet& packet, std::string arg)
{
packet << Packet::STRING;
packet << arg;
}
/*
* Server class for running the service on a TCP socket.
*/
class Server : public Host
{
private:
std::mutex lock;
sf::TcpListener listener;
sf::SocketSelector selector;
std::thread *acceptor;
std::vector<sf::TcpSocket*> clients;
bool running;
static thread_local sf::TcpSocket* current_client;
typedef std::function<void(void)> CleanupHandler;
std::map<sf::TcpSocket*, std::map<ID,CleanupHandler>> cleanups;
public:
Server();
~Server() noexcept(false);
/*
* Put server socket in listening mode and accept incoming connections in a thread.
*/
void Listen(int port = 5000);
/*
* Handle incoming calls on any connection.
*/
void Run();
/*
* Stop accepting new connections.
*/
void Stop();
/*
* Register cleanup handler for the current client being handled.
*/
void PushCleanup(ID cleanup_id, CleanupHandler handler);
void RemoveCleanup(ID cleanup_id);
private:
/*
* Run cleanup handlers for the specified socket.
*/
void cleanup(sf::TcpSocket* socket);
private:
/*
* Handle request (incoming call) and fill packet for reply.
*/
void dispatch(sf::Packet& request, sf::Packet& reply);
};
/*
* Client class for using the service via TCP socket.
*/
class Client : public Host
{
private:
sf::TcpSocket socket;
public:
Client();
/*
* Connect to server specified by host and port number.
*/
void Connect(std::string host = "127.0.0.1", int port = 5000);
/*
* Make a call to the server and return the reply as a vector.
*/
template <typename... Args>
std::vector<std::any> Call(ID method_id, Args&&... args)
{
sf::Packet request;
request << method_id;
/*
* Append all arguments to the request packet.
*/
(put_arg(request, std::forward<Args>(args)), ...);
socket.send(request);
/*
* Receive and parse the reply packet.
*/
sf::Packet reply;
socket.receive(reply);
std::vector<std::any> result;
get_values(reply, result);
return result;
}
/*
* Make a call to the server (with data buffer) and return the reply as a vector.
*/
template <typename... Args>
std::vector<std::any> Call2(ID method_id, const void* ptr, size_t length, Args&&... args)
{
sf::Packet request;
request << method_id;
/*
* Append all arguments to the request packet.
*/
(put_arg(request, std::forward<Args>(args)), ...);
/*
* Append data buffer to the request packet.
*/
request << Packet::DATA;
request.append(ptr, length);
socket.send(request);
/*
* Receive and parse the reply packet.
*/
sf::Packet reply;
socket.receive(reply);
std::vector<std::any> result;
get_values(reply, result);
return result;
}
};
/*
* Interface helper on client side.
*/
class InterfaceClient
{
protected:
Client& client;
ID method_id;
public:
typedef enum {
RELEASE
} Method;
protected:
InterfaceClient(Client& client, ID method_id);
~InterfaceClient();
public:
ID GetMethodID() const;
};
/*
* Interface helper on server side.
*/
template <typename IFace>
class InterfaceServer
{
protected:
Server& server;
ID method_id;
protected:
InterfaceServer(Server& server)
:
server(server)
{
method_id = server.Register([&server, this](std::vector<std::any> args) -> std::any
{
typename IFace::Method method = (typename IFace::Method)(std::any_cast<int>(args[0]));
/*
* Common handler for releasing the interface.
*/
if (method == IFace::RELEASE) {
server.RemoveCleanup(method_id);
delete this;
return 0;
}
/*
* Specific handlers for interface API.
*/
std::function<std::any(std::vector<std::any>)> handler = Lookup(method);
return handler(args);
});
server.RegisterInterface(method_id, this);
server.PushCleanup(method_id, [this]() {
delete this;
});
}
~InterfaceServer()
{
server.UnregisterInterface(method_id);
server.Unregister(method_id);
}
/*
* This method has to be implemented by each server side interface class for handling incoming calls.
*/
virtual std::function<std::any(std::vector<std::any>)> Lookup(typename IFace::Method method) const = 0;
public:
ID GetMethodID() const
{
return method_id;
}
};
}