fix server broadcasting demo

README.md

@@ -18,7 +18,7 @@ An Accordion server allows clients to view and publish chat messages; authentica
 
 Total running list of external software source packages:
  - OpenSSL: TLS Networking Security 
- - RtMidi: Realtime Audio I/O Processing
+ - RtAudio: Realtime Audio I/O Processing
  - libconfig++: Configuration File Interfacing
  - more to come in the future 🐰
 Similarly, a list of dependent linux packages:
@@ -27,7 +27,7 @@ Similarly, a list of dependent linux packages:
 
 ## Development plan: 
 - [x] Build & project setup, get working hello-world program.
-- [ ] TCP Demo between client and server
+- [x] TCP Demo between client and server
 - [ ] Add TLS with OpenSSL on top of the TCP 
 - [ ] Build and deploy server to a Docker container in a CI/CD pipeline
 - [ ] Implement PostgreSQL interfacing for the server

client/src/TcpClient.cpp

@@ -24,8 +24,6 @@ ErrorCode TcpClient::init() {
     logger_->log("TcpClient", LogFlag::Debug, "Initializing TcpClient...");
 
     // keeping everything in here for now
-    int socketFd; // file descriptor for the client socket (socket proper is a function)
-    int sendBytes;
     int receiveBytes;
     char buffer[1024];
 
@@ -36,15 +34,15 @@ ErrorCode TcpClient::init() {
     host = gethostbyname(configuration_.hostname.c_str());
     if(host == NULL) {
         logger_->log("TcpClient", LogFlag::Debug, "Unable to parse hostname.");
-        close(socketFd); // TODO: probably on a destructor
+        close(socketFd_); // TODO: probably on a destructor
         return ErrorCode::Error;
     }
 
     // create tcp socket
-    socketFd = socket(AF_INET, SOCK_STREAM, 0);
-    if(socketFd < 0) {
+    socketFd_ = socket(AF_INET, SOCK_STREAM, 0);
+    if(socketFd_ < 0) {
         logger_->log("TcpClient", LogFlag::Debug, "Unable to open client socket.");
-        close(socketFd);
+        close(socketFd_);
         return ErrorCode::Error;
     }
 
@@ -55,31 +53,25 @@ ErrorCode TcpClient::init() {
     serverAddress.sin_addr = *((struct in_addr*)host->h_addr);
 
     // connect to server
-    if(connect(socketFd, (struct sockaddr*)&serverAddress, sizeof(struct sockaddr)) < 0) {
+    if(connect(socketFd_, (struct sockaddr*)&serverAddress, sizeof(struct sockaddr)) < 0) {
         logger_->log("TcpClient", LogFlag::Debug, "Unable to connect to server.");
-        close(socketFd);
+        close(socketFd_);
         return ErrorCode::Error;
     }
     
-    std::string message = "placeholder";
-    while(!message.empty()) {
-        logger_->log("TcpClient", LogFlag::Debug, "Enter message...");
-        std::getline(std::cin, message);
-
-        // send data buffer to server
-        sendBytes = tcpSend(socketFd, message.c_str(), message.size());
-
-        if(sendBytes < 0) {
-            logger_->log("TcpClient", LogFlag::Error, "Unable to send to server.");
-            close(socketFd);
+    // start sending thread (only needed for cli because std::cin is blocking. a regular message box doesn't need to block for input)
+    pthread_t messengerThread;
+    if(pthread_create(&messengerThread, NULL, TcpClient::sendMessage, static_cast<TcpClient*>(this)) != 0) {
+        logger_->log("TcpClient", LogFlag::Debug, "Unable to spawn messenger thread.");
+        close(socketFd_);
         return ErrorCode::Error;
     }
-        logger_->log("TcpClient", LogFlag::Debug, "Sent {} bytes to the server.", sendBytes);
     
+    while(true) {
 
         // listen for receive from the server
         memset(buffer, 0x00, sizeof(buffer));
-        receiveBytes = tcpRead(socketFd, buffer, sizeof(buffer)); // TODO: this currently blocks forever, add timeout
+        receiveBytes = tcpRead(socketFd_, buffer, sizeof(buffer)); // TODO: this currently blocks forever, add timeout
         // TODO: separate thread
 
         // we expect a response based on the server design, something went wrong otherwise
@@ -88,7 +80,7 @@ ErrorCode TcpClient::init() {
             return ErrorCode::Error;
         } else if(receiveBytes == 0) {
             logger_->log("TcpClient", LogFlag::Error, "Server closed the connection during receive.");
-            close(socketFd);
+            close(socketFd_);
             return ErrorCode::Error;
         }
 
@@ -96,7 +88,30 @@ ErrorCode TcpClient::init() {
         logger_->log("TcpClient", LogFlag::Debug, "Received {} bytes back from the server: {}", receiveBytes, receivedMessage);
     }
 
-    close(socketFd);
+    close(socketFd_);
+    pthread_join(messengerThread, NULL);
 
     return ErrorCode::Success;
 }
+
+void* TcpClient::sendMessage(void* arg) {
+
+    int sendBytes;
+    std::string message = "placeholder";
+    TcpClient* obj = static_cast<TcpClient*>(arg);
+
+    while(true) {
+        obj->logger_->log("TcpClient", LogFlag::Debug, "Enter message...");
+        std::getline(std::cin, message);
+
+        // send data buffer to server
+        sendBytes = obj->tcpSend(obj->socketFd_, message.c_str(), message.size());
+
+        if(sendBytes < 0) {
+            obj->logger_->log("TcpClient", LogFlag::Error, "Unable to send to server.");
+            close(obj->socketFd_);
+            return nullptr;
+        }
+        obj->logger_->log("TcpClient", LogFlag::Debug, "Sent {} bytes to the server.", sendBytes);
+    }
+}

client/src/TcpClient.hpp

@@ -7,6 +7,7 @@
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <sys/time.h> // TODO replace with chrono
+#include <pthread.h>
 
 #include "common/config/ConfigService.hpp"
 #include "common/LoggerService.hpp"
@@ -25,6 +26,10 @@ private:
 
     ErrorCode init();
 
+    // handler for sending messages since std::cin is blocking
+    static void* sendMessage(void* arg);
+
     ClientParams configuration_;
+    int socketFd_; // file descriptor for the client socket (socket proper is a function)
 
 };

server/src/TcpServer.cpp

@@ -172,8 +172,10 @@ ErrorCode TcpServer::handleMessage(const char* message, size_t msgLength, uint32
     logger_->log("TcpClient", LogFlag::Debug, "Received {} bytes from client {}: {}",
         msgLength, clientAddresses[socketId], messageString);
 
+    messageString = std::format("{}: {}", clientAddresses[socketId], messageString);
+
     // broadcast to all clients
-    if(broadcastMessage(message, msgLength) != ErrorCode::Success) {
+    if(broadcastMessage(messageString.c_str(), messageString.length()) != ErrorCode::Success) {
         logger_->log("TcpServer", LogFlag::Error, "Broadcast failure.");
         return ErrorCode::Error;
     }
@@ -183,7 +185,8 @@ ErrorCode TcpServer::handleMessage(const char* message, size_t msgLength, uint32
 
 ErrorCode TcpServer::broadcastMessage(const char* message, size_t msgLength) {
 
-    for(size_t i = 1; i < clientCount; i++) {
+    for(size_t i = 1; i <= clientCount; i++) {
+        if(sockets[i].fd == -1) continue;
 
         ssize_t sendBytes = tcpSend(sockets[i].fd, message, msgLength);
         if(sendBytes != msgLength) {