From b74b895dd44f5a76d581b8dec65dbf76dd5cece9 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 6 May 2019 11:45:08 +0200
Subject: Move TCPDataDispatcher into TcpSocket

---
 src/TcpSocket.cpp | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 123 insertions(+), 7 deletions(-)

(limited to 'src/TcpSocket.cpp')

diff --git a/src/TcpSocket.cpp b/src/TcpSocket.cpp
index 76e9c2e..c05eace 100644
--- a/src/TcpSocket.cpp
+++ b/src/TcpSocket.cpp
@@ -2,7 +2,7 @@
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in
    Right of Canada (Communications Research Center Canada)
 
-   Copyright (C) 2017
+   Copyright (C) 2019
    Matthias P. Braendli, matthias.braendli@mpb.li
 
     http://www.opendigitalradio.org
@@ -27,15 +27,19 @@
 #include "TcpSocket.h"
 #include "Log.h"
 #include <iostream>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
+#include <cstdio>
+#include <cstring>
+#include <cstdint>
 #include <signal.h>
-#include <stdint.h>
+#include <errno.h>
 #include <poll.h>
+#include <thread>
 
 using namespace std;
 
+using vec_u8 = std::vector<uint8_t>;
+
+
 TcpSocket::TcpSocket() :
     m_sock(INVALID_SOCKET)
 {
@@ -147,7 +151,7 @@ ssize_t TcpSocket::send(const void* data, size_t size, int timeout_ms)
         fds[0].fd = m_sock;
         fds[0].events = POLLOUT;
 
-        int retval = poll(fds, 1, timeout_ms);
+        const int retval = poll(fds, 1, timeout_ms);
 
         if (retval == -1) {
             stringstream ss;
@@ -168,7 +172,7 @@ ssize_t TcpSocket::send(const void* data, size_t size, int timeout_ms)
 #else
     const int flags = 0;
 #endif
-    ssize_t ret = ::send(m_sock, (const char*)data, size, flags);
+    const ssize_t ret = ::send(m_sock, (const char*)data, size, flags);
 
     if (ret == SOCKET_ERROR) {
         stringstream ss;
@@ -236,3 +240,115 @@ InetAddress TcpSocket::getRemoteAddress() const
 {
     return m_remote_address;
 }
+
+
+TCPConnection::TCPConnection(TcpSocket&& sock) :
+            queue(),
+            m_running(true),
+            m_sender_thread(),
+            m_sock(move(sock))
+{
+    auto addr = m_sock.getRemoteAddress();
+    etiLog.level(debug) << "New TCP Connection from " <<
+        addr.getHostAddress() << ":" << addr.getPort();
+    m_sender_thread = std::thread(&TCPConnection::process, this);
+}
+
+TCPConnection::~TCPConnection()
+{
+    m_running = false;
+    vec_u8 termination_marker;
+    queue.push(termination_marker);
+    m_sender_thread.join();
+}
+
+void TCPConnection::process()
+{
+    while (m_running) {
+        vec_u8 data;
+        queue.wait_and_pop(data);
+
+        if (data.empty()) {
+            // empty vector is the termination marker
+            m_running = false;
+            break;
+        }
+
+        try {
+            ssize_t remaining = data.size();
+            const uint8_t *buf = reinterpret_cast<const uint8_t*>(data.data());
+            const int timeout_ms = 10; // Less than one ETI frame
+
+            while (m_running and remaining > 0) {
+                const ssize_t sent = m_sock.send(buf, remaining, timeout_ms);
+                if (sent < 0 or sent > remaining) {
+                    throw std::logic_error("Invalid TcpSocket::send() return value");
+                }
+                remaining -= sent;
+                buf += sent;
+            }
+        }
+        catch (const std::runtime_error& e) {
+            m_running = false;
+        }
+    }
+
+    auto addr = m_sock.getRemoteAddress();
+    etiLog.level(debug) << "Dropping TCP Connection from " <<
+        addr.getHostAddress() << ":" << addr.getPort();
+}
+
+
+TCPDataDispatcher::TCPDataDispatcher(size_t max_queue_size) :
+    m_max_queue_size(max_queue_size)
+{
+}
+
+TCPDataDispatcher::~TCPDataDispatcher()
+{
+    m_running = false;
+    m_connections.clear();
+    m_listener_socket.close();
+    m_listener_thread.join();
+}
+
+void TCPDataDispatcher::start(int port, const string& address)
+{
+    TcpSocket sock(port, address);
+    m_listener_socket = move(sock);
+
+    m_running = true;
+    m_listener_thread = std::thread(&TCPDataDispatcher::process, this);
+}
+
+void TCPDataDispatcher::write(const vec_u8& data)
+{
+    for (auto& connection : m_connections) {
+        connection.queue.push(data);
+    }
+
+    m_connections.remove_if(
+            [&](const TCPConnection& conn){ return conn.queue.size() > m_max_queue_size; });
+}
+
+void TCPDataDispatcher::process()
+{
+    try {
+        m_listener_socket.listen();
+
+        const int timeout_ms = 1000;
+
+        while (m_running) {
+            // Add a new TCPConnection to the list, constructing it from the client socket
+            auto sock = m_listener_socket.accept(timeout_ms);
+            if (sock.isValid()) {
+                m_connections.emplace(m_connections.begin(), move(sock));
+            }
+        }
+    }
+    catch (const std::runtime_error& e) {
+        etiLog.level(error) << "TCPDataDispatcher caught runtime error: " << e.what();
+        m_running = false;
+    }
+}
+
-- 
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