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// ServerHandleImpl.h
// Declares the cServerHandleImpl class implementing the TCP server functionality
// This is an internal header, no-one outside OSSupport should need to include it; use Network.h instead
#pragma once
#include "Network.h"
#include <event2/listener.h>
#include "CriticalSection.h"
// fwd:
class cTCPLinkImpl;
typedef std::shared_ptr<cTCPLinkImpl> cTCPLinkImplPtr;
typedef std::vector<cTCPLinkImplPtr> cTCPLinkImplPtrs;
class cServerHandleImpl;
typedef std::shared_ptr<cServerHandleImpl> cServerHandleImplPtr;
typedef std::vector<cServerHandleImplPtr> cServerHandleImplPtrs;
class cServerHandleImpl:
public cServerHandle
{
typedef cServerHandle super;
friend class cTCPLinkImpl;
public:
/** Closes the server, dropping all the connections. */
virtual ~cServerHandleImpl() override;
/** Creates a new server instance listening on the specified port.
Both IPv4 and IPv6 interfaces are used, if possible.
Always returns a server instance; in the event of a failure, the instance holds the error details. Use IsListening() to query success. */
static cServerHandleImplPtr Listen(
UInt16 a_Port,
cNetwork::cListenCallbacksPtr a_ListenCallbacks
);
// cServerHandle overrides:
virtual void Close(void) override;
virtual bool IsListening(void) const override { return m_IsListening; }
protected:
/** The callbacks used to notify about incoming connections. */
cNetwork::cListenCallbacksPtr m_ListenCallbacks;
/** The LibEvent handle representing the main listening socket. */
evconnlistener * m_ConnListener;
/** The LibEvent handle representing the secondary listening socket (only when side-by-side listening is needed, such as WinXP). */
evconnlistener * m_SecondaryConnListener;
/** Set to true when the server is initialized successfully and is listening for incoming connections. */
bool m_IsListening;
/** Container for all currently active connections on this server. */
cTCPLinkImplPtrs m_Connections;
/** Mutex protecting m_Connections againt multithreaded access. */
cCriticalSection m_CS;
/** Contains the error code for the failure to listen. Only valid for non-listening instances. */
int m_ErrorCode;
/** Contains the error message for the failure to listen. Only valid for non-listening instances. */
AString m_ErrorMsg;
/** The SharedPtr to self, so that it can be passed to created links. */
cServerHandleImplPtr m_SelfPtr;
/** Creates a new instance with the specified callbacks.
Initializes the internals, but doesn't start listening yet. */
cServerHandleImpl(cNetwork::cListenCallbacksPtr a_ListenCallbacks);
/** Starts listening on the specified port.
Returns true if successful, false on failure. On failure, sets m_ErrorCode and m_ErrorMsg. */
bool Listen(UInt16 a_Port);
/** The callback called by LibEvent upon incoming connection. */
static void Callback(evconnlistener * a_Listener, evutil_socket_t a_Socket, sockaddr * a_Addr, int a_Len, void * a_Self);
/** Removes the specified link from m_Connections.
Called by cTCPLinkImpl when the link is terminated. */
void RemoveLink(const cTCPLinkImpl * a_Link);
};
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