Implement RFC3164 formatting for syslog message; Implement UDP writer.

src/UDPWriter.cpp

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+/*
+ The MIT License (MIT)
+
+Copyright (c) 2015 Marko Živanović
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+ */
+
+#include <string>
+#include "UDPWriter.h"
+#include "RFC3164FormattedSyslogMessage.h"
+
+using namespace boost::asio::ip;
+
+UDPWriter::UDPWriter(const std::string& destination, const int port) : _destination(destination), _port(port) {
+    udp::resolver resolver(_ios);
+    udp::resolver::query query(_destination, std::to_string(_port));
+    udp::resolver::iterator it = resolver.resolve(query);
+    if (it != udp::resolver::iterator()) {
+        auto endpoint = *it;
+        _socket.connect(endpoint);
+    } else {
+        throw "Destination not found: " + destination;
+    }
+};
+
+void UDPWriter::sendMessage(std::shared_ptr<SyslogMessage> message) {
+    if (_socket.is_open()) {
+        auto formatted = RFC3164FormattedSyslogMessage{*message};
+        auto buff = ::boost::asio::buffer(formatted());
+        _socket.send(buff);
+    }
+}