diff options
Diffstat (limited to 'source/cSocketThreads.cpp')
| -rw-r--r-- | source/cSocketThreads.cpp | 714 |
1 files changed, 0 insertions, 714 deletions
diff --git a/source/cSocketThreads.cpp b/source/cSocketThreads.cpp deleted file mode 100644 index e1fdd8f24..000000000 --- a/source/cSocketThreads.cpp +++ /dev/null @@ -1,714 +0,0 @@ - -// cSocketThreads.cpp - -// Implements the cSocketThreads class representing the heart of MCS's client networking. -// This object takes care of network communication, groups sockets into threads and uses as little threads as possible for full read / write support -// For more detail, see http://forum.mc-server.org/showthread.php?tid=327 - -#include "Globals.h" -#include "cSocketThreads.h" -#include "cClientHandle.h" - - - - - -/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// -// cSocketThreads: - -cSocketThreads::cSocketThreads(void) -{ -} - - - - - -cSocketThreads::~cSocketThreads() -{ - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - delete *itr; - } // for itr - m_Threads[] - m_Threads.clear(); -} - - - - - - -bool cSocketThreads::AddClient(cSocket * a_Socket, cCallback * a_Client) -{ - // Add a (socket, client) pair for processing, data from a_Socket is to be sent to a_Client - - // Try to add to existing threads: - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->IsValid() && (*itr)->HasEmptySlot()) - { - (*itr)->AddClient(a_Socket, a_Client); - return true; - } - } - - // No thread has free space, create a new one: - LOGD("Creating a new cSocketThread (currently have %d)", m_Threads.size()); - cSocketThread * Thread = new cSocketThread(this); - if (!Thread->Start()) - { - // There was an error launching the thread (but it was already logged along with the reason) - LOGERROR("A new cSocketThread failed to start"); - delete Thread; - return false; - } - Thread->AddClient(a_Socket, a_Client); - m_Threads.push_back(Thread); - return true; -} - - - - - -void cSocketThreads::RemoveClient(const cSocket * a_Socket) -{ - // Remove the socket (and associated client) from processing - - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->RemoveSocket(a_Socket)) - { - return; - } - } // for itr - m_Threads[] - - // Cannot assert here, this may actually happen legally, since cClientHandle has to clean up the socket and it may have already closed in the meantime - // ASSERT(!"Removing an unknown socket"); -} - - - - - -void cSocketThreads::RemoveClient(const cCallback * a_Client) -{ - // Remove the associated socket and the client from processing - - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->RemoveClient(a_Client)) - { - return; - } - } // for itr - m_Threads[] - - ASSERT(!"Removing an unknown client"); -} - - - - - -void cSocketThreads::NotifyWrite(const cCallback * a_Client) -{ - // Notifies the thread responsible for a_Client that the client has something to write - - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->NotifyWrite(a_Client)) - { - return; - } - } // for itr - m_Threads[] - - // Cannot assert - this normally happens if a client disconnects and has pending packets, the cServer::cNotifyWriteThread will call this on invalid clients too - // ASSERT(!"Notifying write to an unknown client"); -} - - - - - -void cSocketThreads::Write(const cSocket * a_Socket, const AString & a_Data) -{ - // Puts a_Data into outgoing data queue for a_Socket - - if (!a_Socket->IsValid()) - { - // Socket already closed, ignore the request - return; - } - - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->Write(a_Socket, a_Data)) - { - return; - } - } // for itr - m_Threads[] - - // This may be perfectly legal, if the socket has been destroyed and the client is finishing up - // ASSERT(!"Writing to an unknown socket"); -} - - - - - -/// Stops reading from the socket - when this call returns, no more calls to the callbacks are made -void cSocketThreads::StopReading(const cCallback * a_Client) -{ - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->StopReading(a_Client)) - { - return; - } - } // for itr - m_Threads[] - - // Cannot assert, this normally happens if the socket is closed before the client deinitializes - // ASSERT(!"Stopping reading on an unknown client"); -} - - - - - -/// Queues the socket for closing, as soon as its outgoing data is sent -void cSocketThreads::QueueClose(const cSocket * a_Socket) -{ - if (!a_Socket->IsValid()) - { - // Already closed, ignore the request - return; - } - - cCSLock Lock(m_CS); - for (cSocketThreadList::iterator itr = m_Threads.begin(); itr != m_Threads.end(); ++itr) - { - if ((*itr)->QueueClose(a_Socket)) - { - return; - } - } // for itr - m_Threads[] - - ASSERT(!"Queueing close of an unknown socket"); -} - - - - - -//////////////////////////////////////////////////////////////////////////////// -// cSocketThreads::cSocketThread: - -cSocketThreads::cSocketThread::cSocketThread(cSocketThreads * a_Parent) : - cIsThread("cSocketThread"), - m_Parent(a_Parent), - m_NumSlots(0) -{ - // Nothing needed yet -} - - - - - -cSocketThreads::cSocketThread::~cSocketThread() -{ - m_ShouldTerminate = true; - - // Notify the thread: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("a", 1); - - // Wait for the thread to finish: - Wait(); - - // Close the control sockets: - m_ControlSocket1.CloseSocket(); - m_ControlSocket2.CloseSocket(); -} - - - - - -void cSocketThreads::cSocketThread::AddClient(cSocket * a_Socket, cCallback * a_Client) -{ - ASSERT(m_NumSlots < MAX_SLOTS); // Use HasEmptySlot() to check before adding - - m_Slots[m_NumSlots].m_Client = a_Client; - m_Slots[m_NumSlots].m_Socket = a_Socket; - m_Slots[m_NumSlots].m_Outgoing.clear(); - m_NumSlots++; - - // Notify the thread of the change: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("a", 1); -} - - - - - -bool cSocketThreads::cSocketThread::RemoveClient(const cCallback * a_Client) -{ - // Returns true if removed, false if not found - - if (m_NumSlots == 0) - { - return false; - } - - for (int i = m_NumSlots - 1; i >= 0 ; --i) - { - if (m_Slots[i].m_Client != a_Client) - { - continue; - } - - // Found, remove it: - m_Slots[i] = m_Slots[--m_NumSlots]; - - // Notify the thread of the change: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("r", 1); - return true; - } // for i - m_Slots[] - - // Not found - return false; -} - - - - - -bool cSocketThreads::cSocketThread::RemoveSocket(const cSocket * a_Socket) -{ - // Returns true if removed, false if not found - - for (int i = m_NumSlots - 1; i >= 0 ; --i) - { - if (m_Slots[i].m_Socket != a_Socket) - { - continue; - } - - // Found, remove it: - m_Slots[i] = m_Slots[--m_NumSlots]; - - // Notify the thread of the change: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("r", 1); - return true; - } // for i - m_Slots[] - - // Not found - return false; -} - - - - - -bool cSocketThreads::cSocketThread::HasClient(const cCallback * a_Client) const -{ - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Client == a_Client) - { - return true; - } - } // for i - m_Slots[] - return false; -} - - - - - -bool cSocketThreads::cSocketThread::HasSocket(const cSocket * a_Socket) const -{ - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Socket->GetSocket() == a_Socket->GetSocket()) - { - return true; - } - } // for i - m_Slots[] - return false; -} - - - - - -bool cSocketThreads::cSocketThread::NotifyWrite(const cCallback * a_Client) -{ - if (HasClient(a_Client)) - { - // Notify the thread that there's another packet in the queue: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("q", 1); - return true; - } - return false; -} - - - - - -bool cSocketThreads::cSocketThread::Write(const cSocket * a_Socket, const AString & a_Data) -{ - // Returns true if socket handled by this thread - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Socket == a_Socket) - { - m_Slots[i].m_Outgoing.append(a_Data); - - // Notify the thread that there's data in the queue: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("q", 1); - - return true; - } - } // for i - m_Slots[] - return false; -} - - - - - -bool cSocketThreads::cSocketThread::StopReading (const cCallback * a_Client) -{ - // Returns true if client handled by this thread - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Client == a_Client) - { - m_Slots[i].m_Client = NULL; - m_Slots[i].m_ShouldClose = false; - - // Notify the thread that there's a stop reading request: - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("s", 1); - - return true; - } - } // for i - m_Slots[] - return false; -} - - - - - -bool cSocketThreads::cSocketThread::QueueClose(const cSocket * a_Socket) -{ - // Returns true if socket handled by this thread - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Socket == a_Socket) - { - ASSERT(m_Slots[i].m_Client == NULL); // Should have stopped reading first - m_Slots[i].m_ShouldClose = true; - - // Notify the thread that there's a close queued (in case its conditions are already met): - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("c", 1); - - return true; - } - } // for i - m_Slots[] - return false; -} - - - - - -bool cSocketThreads::cSocketThread::Start(void) -{ - // Create the control socket listener - m_ControlSocket2 = cSocket::CreateSocket(); - if (!m_ControlSocket2.IsValid()) - { - LOGERROR("Cannot create a Control socket for a cSocketThread (\"%s\"); continuing, but server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - return false; - } - cSocket::SockAddr_In Addr; - Addr.Family = cSocket::ADDRESS_FAMILY_INTERNET; - Addr.Address = cSocket::INTERNET_ADDRESS_LOCALHOST(); - Addr.Port = 0; // Any free port is okay - if (m_ControlSocket2.Bind(Addr) != 0) - { - LOGERROR("Cannot bind a Control socket for a cSocketThread (\"%s\"); continuing, but server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - m_ControlSocket2.CloseSocket(); - return false; - } - if (m_ControlSocket2.Listen(1) != 0) - { - LOGERROR("Cannot listen on a Control socket for a cSocketThread (\"%s\"); continuing, but server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - m_ControlSocket2.CloseSocket(); - return false; - } - if (m_ControlSocket2.GetPort() == 0) - { - LOGERROR("Cannot determine Control socket port (\"%s\"); conitnuing, but the server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - m_ControlSocket2.CloseSocket(); - return false; - } - - // Start the thread - if (!super::Start()) - { - LOGERROR("Cannot start new cSocketThread"); - m_ControlSocket2.CloseSocket(); - return false; - } - - // Finish connecting the control socket by accepting connection from the thread's socket - cSocket tmp = m_ControlSocket2.Accept(); - if (!tmp.IsValid()) - { - LOGERROR("Cannot link Control sockets for a cSocketThread (\"%s\"); continuing, but server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - m_ControlSocket2.CloseSocket(); - return false; - } - m_ControlSocket2.CloseSocket(); - m_ControlSocket2 = tmp; - - return true; -} - - - - - -void cSocketThreads::cSocketThread::Execute(void) -{ - // Connect the "client" part of the Control socket: - m_ControlSocket1 = cSocket::CreateSocket(); - cSocket::SockAddr_In Addr; - Addr.Family = cSocket::ADDRESS_FAMILY_INTERNET; - Addr.Address = cSocket::INTERNET_ADDRESS_LOCALHOST(); - Addr.Port = m_ControlSocket2.GetPort(); - ASSERT(Addr.Port != 0); // We checked in the Start() method, but let's be sure - if (m_ControlSocket1.Connect(Addr) != 0) - { - LOGERROR("Cannot connect Control sockets for a cSocketThread (\"%s\"); continuing, but the server may be unreachable from now on.", cSocket::GetLastErrorString().c_str()); - m_ControlSocket2.CloseSocket(); - return; - } - - // The main thread loop: - while (!m_ShouldTerminate) - { - // Put all sockets into the Read set: - fd_set fdRead; - cSocket::xSocket Highest = m_ControlSocket1.GetSocket(); - - PrepareSet(&fdRead, Highest); - - // Wait for the sockets: - if (select(Highest + 1, &fdRead, NULL, NULL, NULL) == -1) - { - LOG("select(R) call failed in cSocketThread: \"%s\"", cSocket::GetLastErrorString().c_str()); - continue; - } - - ReadFromSockets(&fdRead); - - // Test sockets for writing: - fd_set fdWrite; - Highest = m_ControlSocket1.GetSocket(); - PrepareSet(&fdWrite, Highest); - timeval Timeout; - Timeout.tv_sec = 0; - Timeout.tv_usec = 0; - if (select(Highest + 1, NULL, &fdWrite, NULL, &Timeout) == -1) - { - LOG("select(W) call failed in cSocketThread: \"%s\"", cSocket::GetLastErrorString().c_str()); - continue; - } - - WriteToSockets(&fdWrite); - - RemoveClosedSockets(); - } // while (!mShouldTerminate) -} - - - - - -void cSocketThreads::cSocketThread::PrepareSet(fd_set * a_Set, cSocket::xSocket & a_Highest) -{ - FD_ZERO(a_Set); - FD_SET(m_ControlSocket1.GetSocket(), a_Set); - - cCSLock Lock(m_Parent->m_CS); - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (!m_Slots[i].m_Socket->IsValid()) - { - continue; - } - cSocket::xSocket s = m_Slots[i].m_Socket->GetSocket(); - FD_SET(s, a_Set); - if (s > a_Highest) - { - a_Highest = s; - } - } // for i - m_Slots[] -} - - - - - -void cSocketThreads::cSocketThread::ReadFromSockets(fd_set * a_Read) -{ - // Read on available sockets: - - // Reset Control socket state: - if (FD_ISSET(m_ControlSocket1.GetSocket(), a_Read)) - { - char Dummy[128]; - m_ControlSocket1.Receive(Dummy, sizeof(Dummy), 0); - } - - // Read from clients: - cCSLock Lock(m_Parent->m_CS); - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (!FD_ISSET(m_Slots[i].m_Socket->GetSocket(), a_Read)) - { - continue; - } - char Buffer[1024]; - int Received = m_Slots[i].m_Socket->Receive(Buffer, ARRAYCOUNT(Buffer), 0); - if (Received == 0) - { - // The socket has been closed by the remote party, close our socket and let it be removed after we process all reading - m_Slots[i].m_Socket->CloseSocket(); - if (m_Slots[i].m_Client != NULL) - { - m_Slots[i].m_Client->SocketClosed(); - } - } - else if (Received > 0) - { - if (m_Slots[i].m_Client != NULL) - { - m_Slots[i].m_Client->DataReceived(Buffer, Received); - } - } - else - { - // The socket has encountered an error, close it and let it be removed after we process all reading - m_Slots[i].m_Socket->CloseSocket(); - if (m_Slots[i].m_Client != NULL) - { - m_Slots[i].m_Client->SocketClosed(); - } - } - } // for i - m_Slots[] -} - - - - - -void cSocketThreads::cSocketThread::WriteToSockets(fd_set * a_Write) -{ - // Write to available client sockets: - cCSLock Lock(m_Parent->m_CS); - for (int i = m_NumSlots - 1; i >= 0; --i) - { - cSocket Socket(*(m_Slots[i].m_Socket)); - if (!Socket.IsValid() || !FD_ISSET(Socket.GetSocket(), a_Write)) - { - continue; - } - if (m_Slots[i].m_Outgoing.empty()) - { - // Request another chunk of outgoing data: - if (m_Slots[i].m_Client != NULL) - { - m_Slots[i].m_Client->GetOutgoingData(m_Slots[i].m_Outgoing); - } - if (m_Slots[i].m_Outgoing.empty()) - { - // Nothing ready - if ((m_Slots[i].m_Client == NULL) && m_Slots[i].m_ShouldClose) - { - // Socket was queued for closing and there's no more data to send, close it now: - m_Slots[i].m_Socket->CloseSocket(); - m_Slots[i] = m_Slots[--m_NumSlots]; - } - continue; - } - } // if (outgoing data is empty) - - int Sent = m_Slots[i].m_Socket->Send(m_Slots[i].m_Outgoing.data(), m_Slots[i].m_Outgoing.size()); - if (Sent < 0) - { - int Err = cSocket::GetLastError(); - LOGWARNING("Error %d while writing to client \"%s\", disconnecting. \"%s\"", Err, m_Slots[i].m_Socket->GetIPString().c_str(), cSocket::GetErrorString(Err).c_str()); - m_Slots[i].m_Socket->CloseSocket(); - if (m_Slots[i].m_Client != NULL) - { - m_Slots[i].m_Client->SocketClosed(); - } - return; - } - m_Slots[i].m_Outgoing.erase(0, Sent); - - // _X: If there's data left, it means the client is not reading fast enough, the server would unnecessarily spin in the main loop with zero actions taken; so signalling is disabled - // This means that if there's data left, it will be sent only when there's incoming data or someone queues another packet (for any socket handled by this thread) - /* - // If there's any data left, signalize the Control socket: - if (!m_Slots[i].m_Outgoing.empty()) - { - ASSERT(m_ControlSocket2.IsValid()); - m_ControlSocket2.Send("q", 1); - } - */ - } // for i - m_Slots[i] -} - - - - - -void cSocketThreads::cSocketThread::RemoveClosedSockets(void) -{ - // Removes sockets that have closed from m_Slots[] - - cCSLock Lock(m_Parent->m_CS); - for (int i = m_NumSlots - 1; i >= 0; --i) - { - if (m_Slots[i].m_Socket->IsValid()) - { - continue; - } - m_Slots[i] = m_Slots[--m_NumSlots]; - } // for i - m_Slots[] -} - - - - |