cNetwork: Added link creation callback.
This allows the callback classes to store the link inside them and use it internally later on, mainly for sending data.
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@ -13,6 +13,14 @@
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// fwd:
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class cTCPLink;
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typedef SharedPtr<cTCPLink> cTCPLinkPtr;
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/** Interface that provides the methods available on a single TCP connection. */
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class cTCPLink
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{
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@ -25,16 +33,20 @@ public:
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// Force a virtual destructor for all descendants:
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virtual ~cCallbacks() {}
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/** Called when the cTCPLink for the connection is created.
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The callback may store the cTCPLink instance for later use, but it should remove it in OnError(), OnRemoteClosed() or right after Close(). */
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virtual void OnLinkCreated(cTCPLinkPtr a_Link) = 0;
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/** Called when there's data incoming from the remote peer. */
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virtual void OnReceivedData(cTCPLink & a_Link, const char * a_Data, size_t a_Length) = 0;
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virtual void OnReceivedData(const char * a_Data, size_t a_Length) = 0;
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/** Called when the remote end closes the connection.
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The link is still available for connection information query (IP / port).
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Sending data on the link is not an error, but the data won't be delivered. */
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virtual void OnRemoteClosed(cTCPLink & a_Link) = 0;
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virtual void OnRemoteClosed(void) = 0;
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/** Called when an error is detected on the connection. */
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virtual void OnError(cTCPLink & a_Link, int a_ErrorCode, const AString & a_ErrorMsg) = 0;
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virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) = 0;
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};
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typedef SharedPtr<cCallbacks> cCallbacksPtr;
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@ -283,6 +283,8 @@ void cServerHandleImpl::Callback(evconnlistener * a_Listener, evutil_socket_t a_
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cCSLock Lock(Self->m_CS);
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Self->m_Connections.push_back(Link);
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} // Lock(m_CS)
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LinkCallbacks->OnLinkCreated(Link);
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Link->Enable();
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// Call the OnAccepted callback:
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Self->m_ListenCallbacks->OnAccepted(*Link);
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@ -20,9 +20,6 @@ cTCPLinkImpl::cTCPLinkImpl(cTCPLink::cCallbacksPtr a_LinkCallbacks):
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m_BufferEvent(bufferevent_socket_new(cNetworkSingleton::Get().GetEventBase(), -1, BEV_OPT_CLOSE_ON_FREE)),
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m_Server(nullptr)
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{
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// Create the LibEvent handle, but don't assign a socket to it yet (will be assigned within Connect() method):
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bufferevent_setcb(m_BufferEvent, ReadCallback, nullptr, EventCallback, this);
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bufferevent_enable(m_BufferEvent, EV_READ | EV_WRITE);
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}
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@ -37,10 +34,6 @@ cTCPLinkImpl::cTCPLinkImpl(evutil_socket_t a_Socket, cTCPLink::cCallbacksPtr a_L
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// Update the endpoint addresses:
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UpdateLocalAddress();
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UpdateAddress(a_Address, a_AddrLen, m_RemoteIP, m_RemotePort);
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// Create the LibEvent handle:
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bufferevent_setcb(m_BufferEvent, ReadCallback, nullptr, EventCallback, this);
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bufferevent_enable(m_BufferEvent, EV_READ | EV_WRITE);
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}
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@ -65,6 +58,8 @@ cTCPLinkImplPtr cTCPLinkImpl::Connect(const AString & a_Host, UInt16 a_Port, cTC
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cTCPLinkImplPtr res{new cTCPLinkImpl(a_LinkCallbacks)}; // Cannot use std::make_shared here, constructor is not accessible
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res->m_ConnectCallbacks = a_ConnectCallbacks;
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cNetworkSingleton::Get().AddLink(res);
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res->m_Callbacks->OnLinkCreated(res);
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res->Enable();
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// If a_Host is an IP address, schedule a connection immediately:
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sockaddr_storage sa;
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@ -107,6 +102,17 @@ cTCPLinkImplPtr cTCPLinkImpl::Connect(const AString & a_Host, UInt16 a_Port, cTC
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void cTCPLinkImpl::Enable(void)
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{
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// Set the LibEvent callbacks and enable processing:
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bufferevent_setcb(m_BufferEvent, ReadCallback, nullptr, EventCallback, this);
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bufferevent_enable(m_BufferEvent, EV_READ | EV_WRITE);
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}
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bool cTCPLinkImpl::Send(const void * a_Data, size_t a_Length)
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{
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return (bufferevent_write(m_BufferEvent, a_Data, a_Length) == 0);
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@ -160,7 +166,7 @@ void cTCPLinkImpl::ReadCallback(bufferevent * a_BufferEvent, void * a_Self)
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size_t length;
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while ((length = bufferevent_read(a_BufferEvent, data, sizeof(data))) > 0)
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{
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Self->m_Callbacks->OnReceivedData(*Self, data, length);
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Self->m_Callbacks->OnReceivedData(data, length);
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}
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}
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@ -189,7 +195,7 @@ void cTCPLinkImpl::EventCallback(bufferevent * a_BufferEvent, short a_What, void
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}
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else
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{
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Self->m_Callbacks->OnError(*Self, err, evutil_socket_error_to_string(err));
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Self->m_Callbacks->OnError(err, evutil_socket_error_to_string(err));
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if (Self->m_Server == nullptr)
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{
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cNetworkSingleton::Get().RemoveLink(Self);
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@ -219,7 +225,7 @@ void cTCPLinkImpl::EventCallback(bufferevent * a_BufferEvent, short a_What, void
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// If the connection has been closed, call the link callback and remove the connection:
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if (a_What & BEV_EVENT_EOF)
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{
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Self->m_Callbacks->OnRemoteClosed(*Self);
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Self->m_Callbacks->OnRemoteClosed();
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if (Self->m_Server != nullptr)
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{
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Self->m_Server->RemoveLink(Self);
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@ -37,7 +37,8 @@ class cTCPLinkImpl:
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public:
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/** Creates a new link based on the given socket.
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Used for connections accepted in a server using cNetwork::Listen().
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a_Address and a_AddrLen describe the remote peer that has connected. */
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a_Address and a_AddrLen describe the remote peer that has connected.
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The link is created disabled, you need to call Enable() to start the regular communication. */
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cTCPLinkImpl(evutil_socket_t a_Socket, cCallbacksPtr a_LinkCallbacks, cServerHandleImpl * a_Server, const sockaddr * a_Address, socklen_t a_AddrLen);
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/** Destroys the LibEvent handle representing the link. */
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@ -48,6 +49,11 @@ public:
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Returns a link that has the connection request queued, or NULL for failure. */
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static cTCPLinkImplPtr Connect(const AString & a_Host, UInt16 a_Port, cTCPLink::cCallbacksPtr a_LinkCallbacks, cNetwork::cConnectCallbacksPtr a_ConnectCallbacks);
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/** Enables communication over the link.
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Links are created with communication disabled, so that creation callbacks can be called first.
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This function then enables the regular communication to be reported. */
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void Enable(void);
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// cTCPLink overrides:
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virtual bool Send(const void * a_Data, size_t a_Length) override;
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virtual AString GetLocalIP(void) const override { return m_LocalIP; }
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@ -85,7 +91,8 @@ protected:
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/** Creates a new link to be queued to connect to a specified host:port.
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Used for outgoing connections created using cNetwork::Connect().
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To be used only by the Connect() factory function. */
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To be used only by the Connect() factory function.
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The link is created disabled, you need to call Enable() to start the regular communication. */
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cTCPLinkImpl(const cCallbacksPtr a_LinkCallbacks);
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/** Callback that LibEvent calls when there's data available from the remote peer. */
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@ -16,11 +16,21 @@
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class cEchoLinkCallbacks:
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public cTCPLink::cCallbacks
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{
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virtual void OnReceivedData(cTCPLink & a_Link, const char * a_Data, size_t a_Size) override
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// cTCPLink::cCallbacks overrides:
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virtual void OnLinkCreated(cTCPLinkPtr a_Link) override
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{
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ASSERT(m_Link == nullptr);
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m_Link = a_Link;
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}
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virtual void OnReceivedData(const char * a_Data, size_t a_Size) override
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{
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ASSERT(m_Link != nullptr);
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// Echo the incoming data back to outgoing data:
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LOGD("%p (%s:%d): Data received (%u bytes), echoing back.", &a_Link, a_Link.GetRemoteIP().c_str(), a_Link.GetRemotePort(), static_cast<unsigned>(a_Size));
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a_Link.Send(a_Data, a_Size);
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LOGD("%p (%s:%d): Data received (%u bytes), echoing back.", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort(), static_cast<unsigned>(a_Size));
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m_Link->Send(a_Data, a_Size);
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LOGD("Echo queued");
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// Search for a Ctrl+Z, if found, drop the connection:
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@ -28,21 +38,33 @@ class cEchoLinkCallbacks:
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{
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if (a_Data[i] == '\x1a')
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{
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a_Link.Close();
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m_Link->Close();
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m_Link.reset();
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return;
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}
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}
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}
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virtual void OnRemoteClosed(cTCPLink & a_Link) override
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virtual void OnRemoteClosed(void) override
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{
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LOGD("%p (%s:%d): Remote has closed the connection.", &a_Link, a_Link.GetRemoteIP().c_str(), a_Link.GetRemotePort());
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ASSERT(m_Link != nullptr);
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LOGD("%p (%s:%d): Remote has closed the connection.", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort());
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m_Link.reset();
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}
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virtual void OnError(cTCPLink & a_Link, int a_ErrorCode, const AString & a_ErrorMsg) override
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virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
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{
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LOGD("%p (%s:%d): Error %d in the cEchoLinkCallbacks: %s", &a_Link, a_Link.GetRemoteIP().c_str(), a_Link.GetRemotePort(), a_ErrorCode, a_ErrorMsg.c_str());
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ASSERT(m_Link != nullptr);
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LOGD("%p (%s:%d): Error %d in the cEchoLinkCallbacks: %s", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort(), a_ErrorCode, a_ErrorMsg.c_str());
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m_Link.reset();
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}
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/** The link attached to this callbacks instance. */
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cTCPLinkPtr m_Link;
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};
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@ -49,24 +49,39 @@ class cDumpCallbacks:
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public cTCPLink::cCallbacks
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{
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cEvent & m_Event;
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cTCPLinkPtr m_Link;
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virtual void OnReceivedData(cTCPLink & a_Link, const char * a_Data, size_t a_Size) override
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virtual void OnLinkCreated(cTCPLinkPtr a_Link) override
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{
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ASSERT(m_Link == nullptr);
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m_Link = a_Link;
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}
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virtual void OnReceivedData(const char * a_Data, size_t a_Size) override
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{
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ASSERT(m_Link != nullptr);
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// Log the incoming data size:
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AString Hex;
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CreateHexDump(Hex, a_Data, a_Size, 16);
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LOGD("Incoming data: %u bytes:\n%s", static_cast<unsigned>(a_Size), Hex.c_str());
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}
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virtual void OnRemoteClosed(cTCPLink & a_Link) override
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virtual void OnRemoteClosed(void) override
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{
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ASSERT(m_Link != nullptr);
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LOGD("Remote has closed the connection.");
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m_Link.reset();
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m_Event.Set();
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}
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virtual void OnError(cTCPLink & a_Link, int a_ErrorCode, const AString & a_ErrorMsg) override
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virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
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{
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ASSERT(m_Link != nullptr);
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LOGD("Error %d (%s) in the cDumpCallbacks.", a_ErrorCode, a_ErrorMsg.c_str());
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m_Link.reset();
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m_Event.Set();
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}
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