SocketNetworkSystem.h
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SocketNetworkSystem.h
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	#ifndef _SOCKETNETWORKSYSTEM_H_
	#define _SOCKETNETWORKSYSTEM_H_
	#include <echo/Network/NetRedefinitions.h>
	#include <echo/Network/NetworkManager.h>
	#include <echo/Network/NetworkSystem.h>
	#include <echo/Kernel/TaskThread.h>
	#include <echo/Kernel/Mutex.h>
	#include <list>
	#include <map>

	namespace Echo
	{
	class Connection;
	class ConnectionDetails;
	class IncomingConnectionListener;

	class SocketNetworkSystem : public NetworkSystem
	{
	protected:
	class SocketThreadTask;
	Mutex mConnectionsMutex;
	std::map< Socket, shared_ptr<Connection> > mConnections;
	std::map< Socket, IncomingConnectionListener* > mIncomingConnectionListeners;

	struct ThreadTaskPair
	{
	shared_ptr<TaskThread> mThread;
	shared_ptr<SocketThreadTask> mSocketThreadTask;
	};
	std::list< shared_ptr<ThreadTaskPair> > mSocketThreadTasks;
	std::list< shared_ptr<ThreadTaskPair> > mThreadTasksToCleanup;
	std::map< Socket, shared_ptr<ThreadTaskPair> > mSocketThreadTaskConnectionLookup;
	bool mStarted;
	Size mMaximumSocketsPerThread;
	int mPollTimeInMS;
	Mutex mSocketThreadTasksMutex;

	//Read set for listen and read data
	//Write set for connect and write data
	//except for connect failed

	//Each SocketThreadTask can monitor up to FD_SETSIZE
	class SocketThreadTask : public Task
	{
	public:
	SocketThreadTask(SocketNetworkSystem& s, Size maximumSockets, int pollTimeInMS);
	~SocketThreadTask();

	bool AddSocket(Socket s);
	bool RemoveSocket(Socket s);

	void EnableWriteCheck(Socket s);
	void DisableWriteCheck(Socket s);

	void Update(Seconds lastFrameTime);
	Size GetSocketCount() const
	{
	return mCount;
	}
	bool HasCapacity() const
	{
	return (mCount<mMaximumSockets);
	}
	private:
	Mutex mPendingSocketsMutex;
	std::set< Socket > mPendingAddSockets;
	std::set< Socket > mPendingRemovalSockets;
	std::set< Socket > mPendingWriteDisableSockets;
	std::set< Socket > mPendingWriteEnableSockets;
	std::vector< pollfd > mPollFDs;
	std::map< Socket, Size > mSocketToPollFDMap;
	// These internal methods should only be called when the pending mutex is locked
	void InternalAddSocket(Socket s);
	void InternalRemoveSocket(Socket s);
	void InternalWriteDisable(Socket s);
	void InternalWriteEnable(Socket s);
	std::atomic<bool> mPollUpdateRequired;
	Size mCount;
	Size mMaximumSockets;
	int mPollTimeInMS;
	SocketNetworkSystem& mSystem;
	};

	private:
	friend class SocketThreadTask;
	void CheckForTimeout(Socket s);
	void ReadNotify(Socket s);
	void WriteNotify(Socket s);
	void ExceptNotify(Socket s);
	bool IsSocketConnected(Socket s);
	bool AssignThreadTask(Socket s);

	/**
	* Mutex must be locked
	* @return a ThreadTaskPair if one has capacity, otherwise false.
	*/
	shared_ptr<ThreadTaskPair> FindAvailableSocketThreadTask();

	/**
	* Attempts to accept a connection.
	* @returns false if the socket is not a listening socket, otherwise true.
	*/
	bool AcceptConnection(Socket s);

	void OnThreadTaskComplete(shared_ptr<ThreadTaskPair> taskPair);
	public:

	struct InterfaceInformation
	{
	std::string mHostname;
	std::string mIPAddress;
	std::string mSubnetMask;
	std::string mGateway;
	std::string mDNS1;
	std::string mDNS2;
	std::string mMacAddress;
	};

	SocketNetworkSystem(NetworkManager& networkManager, Size maximumSocketsPerThread = 0, int pollTimeInMS = 2000);
	~SocketNetworkSystem();

	//Initialise the Network System. Perform initialisation/allocations here
	bool Initialise();

	//Start is called when ENetwork begins execution. This is a good
	//point to execute any threads.
	bool Start();

	void CleanUp();

	void DisconnectAll();

	//This method should fill outSupportedConnectionTypes with any connection types this system supports.
	//Common connection types include, Passive and Direct
	void GetSupportedConnectionTypes( std::vector< std::string >& outSupportedConnectionTypes );

	//This method should fill outAdditionalInformation with any additional information required or optional
	//for each of the supported connection types. Each entry in this vector should correlate with each
	//corresponding element in the vector in GetSupportedConnectionTypes().
	void GetAdditionalConnectionInformationFormat( std::vector< std::string >& outAdditionalInformation );

	static bool GetInterfaceInformation(std::vector<InterfaceInformation>& outInterfaceInformation);

	//Perform an Asynchronous Listen. IMPORTANT: This function should not block
	bool Listen( IncomingConnectionListener* listener, const ConnectionDetails& connectionDetails );

	//Perform an Asynchronous Connect. IMPORTANT: This function should not block
	shared_ptr<Connection> Connect( const ConnectionDetails& connectionDetails, Connection::ConnectCallback connectionCallback, Connection::DisconnectCallback disconnectCallback);

	bool UpdateSocket(Socket s, shared_ptr<Connection> connection);

	void EnableSocketWriteCheck(Socket s);
	void DisableSocketWriteCheck(Socket s);

	//Returns true on success, or false if there was an error
	bool SetSocketBlockingEnabled(int fd, bool blocking);
	void CleanSocket(Socket s);
	/**
	* Attempts to get the host IP by name or string IP.
	* @param hostNameOrIP The hostname or IP address as a string, e.g. www.emblem.net.au or 192.168.1.1.
	* @param output The IPv4 address will be written to this value upon success. The value is not modified
	* if there is an error.
	* @return false if the DNS lookup failed.
	*/
	static bool GetHostByName(const std::string& hostnameOrIP, u32& output);

	static bool HandleError(int code);
	};
	}
	#endif

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