Receive data with epoll_wait

2 files changed, 176 insertions, 35 deletions

diff --git a/src/DirectConnection.cpp b/src/DirectConnection.cpp
index 12ae761..3e79658 100644
--- a/src/DirectConnection.cpp
+++ b/src/DirectConnection.cpp
@@ -1,4 +1,5 @@
 #include "../include/DirectConnection.hpp"
+#include "../include/Log.hpp"
 #include <cstdio>
 #include <cstring>
 
@@ -13,6 +14,9 @@
 
 namespace sibs
 {
+    // Max received data size allowed when receiving regular data, receive data as file to receive more data
+    const int MAX_RECEIVED_DATA_SIZE = 1024 * 1024 * 1; // 1Mb
+    
     Ipv4::Ipv4(const char *ip, u16 port)
     {        
         struct addrinfo hints = {};
@@ -37,33 +41,42 @@ namespace sibs
         freeaddrinfo(address);
     }
     
-    DirectConnections::DirectConnections() : 
-        mySocket(0)
+    DirectConnections::DirectConnections(u16 _port) : 
+        port(_port),
+        alive(true)
     {
-        try
-        {
-            init();
-        }
-        catch(...)
-        {
-            cleanup();
-        }
+        UDT::startup();
+        eid = UDT::epoll_create();
+        receiveDataThread = std::thread(&DirectConnections::receiveData, this);
     }
     
     DirectConnections::~DirectConnections()
     {
-        cleanup();
+        alive = false;
+        receiveDataThread.join();
+        
+        for(auto &peer : peers)
+        {
+            UDT::close(peer.first);
+        }
+        UDT::epoll_release(eid);
+        UDT::cleanup();
     }
     
-    void DirectConnections::init()
+    std::shared_ptr<DirectConnectionPeer> DirectConnections::connect(const Ipv4 &address, PubSubReceiveDataCallback receiveDataCallbackFunc)
     {
-        UDT::startup();
-        eid = UDT::epoll_create();
-        mySocket = UDT::socket(AI_PASSIVE, AF_INET, SOCK_STREAM);
+        UDTSOCKET socket = UDT::socket(AI_PASSIVE, AF_INET, SOCK_STREAM);
+        if(socket == UDT::INVALID_SOCK)
+        {
+            std::string errMsg = "UDT: Failed to create socket, error: ";
+            errMsg += UDT::getlasterror_desc();
+            throw ConnectionException(errMsg);
+        }
+        
         bool rendezvous = true;
-        UDT::setsockopt(mySocket, 0, UDT_RENDEZVOUS, &rendezvous, sizeof(bool));
+        UDT::setsockopt(socket, 0, UDT_RENDEZVOUS, &rendezvous, sizeof(bool));
         bool reuseAddr = true;
-        UDT::setsockopt(mySocket, 0, UDT_REUSEADDR, &reuseAddr, sizeof(bool));
+        UDT::setsockopt(socket, 0, UDT_REUSEADDR, &reuseAddr, sizeof(bool));
         
         // Windows UDP issue
         // For better performance, modify HKLM\System\CurrentControlSet\Services\Afd\Parameters\FastSendDatagramThreshold
@@ -74,39 +87,124 @@ namespace sibs
         
         sockaddr_in myAddr = {};
         myAddr.sin_family = AF_INET;
-        myAddr.sin_port = htons(9000);
+        myAddr.sin_port = htons(port);
         myAddr.sin_addr.s_addr = INADDR_ANY;
         memset(&myAddr.sin_zero, '\0', 8);
 
-        if(UDT::bind(mySocket, (sockaddr*)&myAddr, sizeof(myAddr)) == UDT::ERROR)
+        if(UDT::bind(socket, (sockaddr*)&myAddr, sizeof(myAddr)) == UDT::ERROR)
         {
-            // TODO: Add ip and port to error
             std::string errMsg = "UDT: Failed to bind, error: ";
-            errMsg += UDT::getlasterror().getErrorMessage();
+            errMsg += UDT::getlasterror_desc();
             throw ConnectionException(errMsg);
         }
+        
+        if(UDT::connect(socket, address.address->ai_addr, address.address->ai_addrlen) == UDT::ERROR)
+        {
+            std::string errMsg = "UDT: Failed to connect, error: ";
+            errMsg += UDT::getlasterror_desc();
+            throw ConnectionException(errMsg);
+        }
+        
+        UDT::epoll_add_usock(eid, socket);
+        std::shared_ptr<DirectConnectionPeer> peer = std::make_shared<DirectConnectionPeer>();
+        peer->socket = socket;
+        peer->receiveDataCallbackFunc = receiveDataCallbackFunc;
+        peersMutex.lock();
+        peers[socket] = peer;
+        peersMutex.unlock();
+        return peer;
     }
     
-    void DirectConnections::cleanup()
+    void DirectConnections::send(const std::shared_ptr<DirectConnectionPeer> &peer, const void *data, const usize size)
     {
-        UDT::epoll_release(eid);
-        
-        if(mySocket != 0)
-            UDT::close(mySocket);
+        usize sentSizeTotal = 0;
+        while(sentSizeTotal < size)
+        {
+            int sentSize = UDT::send(peer->socket, (char*)data + sentSizeTotal, size - sentSizeTotal, 0);
+            if(sentSize == UDT::ERROR)
+            {
+                std::string errMsg = "UDT: Failed to send data, error: ";
+                errMsg += UDT::getlasterror_desc();
+                throw SendException(errMsg);
+            }
+            sentSizeTotal += sentSize;
+        }
+    }
+    
+    void DirectConnections::receiveData()
+    {
+        std::vector<char> data;
+        data.reserve(MAX_RECEIVED_DATA_SIZE);
         
-        UDT::cleanup();
+        std::set<UDTSOCKET> readfds;
+        while(alive)
+        {
+            int numfsReady = UDT::epoll_wait(eid, &readfds, nullptr, 250);
+            if(numfsReady == 0)
+                continue;
+            else if(numfsReady == -1)
+            {
+                if(UDT::getlasterror_code() == UDT::ERRORINFO::ETIMEOUT)
+                    continue;
+                else
+                {
+                    Log::error("UDT: Stop receiving data, got error: %s", UDT::getlasterror_desc());
+                    return;
+                }
+            }
+            
+            for(UDTSOCKET receivedDataFromPeer : readfds)
+            {
+                bool receivedData = receiveDataFromPeer(receivedDataFromPeer, data.data());
+                if(receivedData)
+                {
+                    peersMutex.lock();
+                    auto peer = peers[receivedDataFromPeer];
+                    peersMutex.unlock();
+                    try
+                    {
+                        if(peer->receiveDataCallbackFunc)
+                            peer->receiveDataCallbackFunc(data.data(), data.size());
+                    }
+                    catch(std::exception &e)
+                    {
+                        Log::error("UDT: Receive callback function threw exception: %s, ignoring...", e.what());
+                    }
+                }
+            }
+            readfds.clear();
+        }
     }
     
-    void DirectConnections::connect(const Ipv4 &address)
+    bool DirectConnections::receiveDataFromPeer(const int socket, char *output)
     {
-        if(UDT::connect(mySocket, address.address->ai_addr, address.address->ai_addrlen) == UDT::ERROR)
+        usize receivedTotalSize = 0;
+        while(receivedTotalSize < MAX_RECEIVED_DATA_SIZE)
         {
-            // TODO: Add ip and port to error
-            std::string errMsg = "UDT: Failed to connect, error: ";
-            errMsg += UDT::getlasterror().getErrorMessage();
-            throw ConnectionException(errMsg);
+            usize dataAvailableSize;
+            int receiveSizeDataTypeSize = sizeof(dataAvailableSize);
+            if(UDT::getsockopt(socket, 0, UDT_RCVDATA, &dataAvailableSize, &receiveSizeDataTypeSize) == UDT::ERROR)
+            {
+                Log::error("UDT: Failed to receive data available size, error: %s", UDT::getlasterror_desc());
+                return false;
+            }
+            
+            int receivedSize = UDT::recv(socket, &output[receivedTotalSize], MAX_RECEIVED_DATA_SIZE - receivedTotalSize, 0);
+            if(receivedSize == UDT::ERROR)
+            {
+                Log::error("UDT: Failed to receive data, error: %s", UDT::getlasterror_desc());
+                return false;
+            }
+            
+            if(receivedSize == 0)
+            {
+                return true;
+            }
+            
+            receivedTotalSize += dataAvailableSize;
         }
         
-        //UDT::epoll_add_usock(eid, 2);
-    } 
+        Log::error("UDT: Received too much data, ignoring...");
+        return false;
+    }
 }
diff --git a/src/Log.cpp b/src/Log.cpp
new file mode 100644
index 0000000..df424f0
--- /dev/null
+++ b/src/Log.cpp
@@ -0,0 +1,43 @@
+#include "../include/Log.hpp"
+#include <cstdarg>
+#include <cstdio>
+#include <mutex>
+
+namespace sibs
+{
+    // TODO: Disable color if stdout/stderr is not tty
+    static std::mutex mutexLog;
+    
+    void Log::debug(const char *fmt, ...)
+    {
+        std::lock_guard<std::mutex> lock(mutexLog);
+        va_list args;
+        va_start(args, fmt);
+        fputs("\033[1;32mDebug:\033[0m ", stdout);
+        vfprintf(stdout, fmt, args);
+        fputs("\n", stdout);
+        va_end(args);
+    }
+    
+    void Log::warn(const char *fmt, ...)
+    {
+        std::lock_guard<std::mutex> lock(mutexLog);
+        va_list args;
+        va_start(args, fmt);
+        fputs("\033[1;33mWarning:\033[0m ", stdout);
+        vfprintf(stdout, fmt, args);
+        fputs("\n", stdout);
+        va_end(args);
+    }
+    
+    void Log::error(const char *fmt, ...)
+    {
+        std::lock_guard<std::mutex> lock(mutexLog);
+        va_list args;
+        va_start(args, fmt);
+        fputs("\033[1;31mError:\033[0m ", stderr);
+        vfprintf(stderr, fmt, args);
+        fputs("\n", stderr);
+        va_end(args);
+    }
+}