added skeleton for the json connection server

libsrc/CMakeLists.txt

@@ -4,4 +4,5 @@ SET(CURRENT_HEADER_DIR ${CMAKE_SOURCE_DIR}/include)
 SET(CURRENT_SOURCE_DIR ${CMAKE_SOURCE_DIR}/libsrc)
 
 add_subdirectory(hyperion)
+add_subdirectory(jsonserver)
 add_subdirectory(utils)

libsrc/jsonserver/CMakeLists.txt

@@ -0,0 +1,36 @@
+
+# Define the current source locations
+SET(CURRENT_HEADER_DIR ${CMAKE_SOURCE_DIR}/include/jsonserver)
+SET(CURRENT_SOURCE_DIR ${CMAKE_SOURCE_DIR}/libsrc/jsonserver)
+
+# Group the headers that go through the MOC compiler
+SET(JsonServer_QT_HEADERS
+		${CURRENT_HEADER_DIR}/JsonServer.h
+		${CURRENT_SOURCE_DIR}/JsonClientConnection.h
+)
+
+SET(JsonServer_HEADERS
+)
+
+SET(JsonServer_SOURCES
+		${CURRENT_SOURCE_DIR}/JsonServer.cpp
+		${CURRENT_SOURCE_DIR}/JsonClientConnection.cpp
+)
+
+qt4_wrap_cpp(JsonServer_HEADERS_MOC ${JsonServer_QT_HEADERS})
+
+add_library(jsonserver
+		${JsonServer_HEADERS}
+		${JsonServer_QT_HEADERS}
+		${JsonServer_HEADERS_MOC}
+		${JsonServer_SOURCES}
+)
+
+target_link_libraries(jsonserver
+		hyperion
+		jsoncpp)
+
+qt4_use_modules(jsonserver
+	Core
+	Gui
+	Network)

libsrc/jsonserver/JsonClientConnection.cpp

@@ -0,0 +1,77 @@
+// stl includes
+#include <iostream>
+
+#include "JsonClientConnection.h"
+
+JsonClientConnection::JsonClientConnection(QTcpSocket *socket) :
+	QObject(),
+	_socket(socket)
+{
+	connect(_socket, SIGNAL(disconnected()), this, SLOT(socketClosed()));
+	connect(_socket, SIGNAL(readyRead()), this, SLOT(readData()));
+}
+
+
+JsonClientConnection::~JsonClientConnection()
+{
+	delete _socket;
+}
+
+void JsonClientConnection::readData()
+{
+	_receiveBuffer += _socket->readAll();
+
+	int bytes = _receiveBuffer.indexOf('\n') + 1;
+	if (bytes != 0)
+	{
+		// create message string
+		std::string message(_receiveBuffer.data(), bytes);
+
+		// remove message data from buffer
+		_receiveBuffer = _receiveBuffer.mid(bytes);
+
+		// handle message
+		handleMessage(message);
+	}
+}
+
+void JsonClientConnection::socketClosed()
+{
+	emit connectionClosed(this);
+}
+
+void JsonClientConnection::handleMessage(const std::string &message)
+{
+	Json::Reader reader;
+	Json::Value messageRoot;
+	if (!reader.parse(message, messageRoot, false))
+	{
+		sendErrorReply("Error while parsing json: " + reader.getFormattedErrorMessages());
+		return;
+	}
+
+	handleNotImplemented(messageRoot);
+}
+
+void JsonClientConnection::handleNotImplemented(const Json::Value & message)
+{
+	sendErrorReply("Command not implemented");
+}
+
+void JsonClientConnection::sendMessage(const Json::Value &message)
+{
+	Json::FastWriter writer;
+	std::string serializedReply = writer.write(message);
+	_socket->write(serializedReply.data(), serializedReply.length());
+}
+
+void JsonClientConnection::sendErrorReply(const std::string &error)
+{
+	// create reply
+	Json::Value reply;
+	reply["success"] = false;
+	reply["error"] = error;
+
+	// send reply
+	sendMessage(reply);
+}

libsrc/jsonserver/JsonClientConnection.h

@@ -0,0 +1,39 @@
+#pragma once
+
+// stl includes
+#include <string>
+
+// Qt includes
+#include <QByteArray>
+#include <QTcpSocket>
+
+// jsoncpp includes
+#include <json/json.h>
+
+class JsonClientConnection : public QObject
+{
+	Q_OBJECT
+
+public:
+	JsonClientConnection(QTcpSocket * socket);
+	~JsonClientConnection();
+
+signals:
+	void connectionClosed(JsonClientConnection * connection);
+
+private slots:
+	void readData();
+	void socketClosed();
+
+private:
+	void handleMessage(const std::string & message);
+	void handleNotImplemented(const Json::Value & message);
+
+	void sendMessage(const Json::Value & message);
+	void sendErrorReply(const std::string & error);
+
+private:
+	QTcpSocket * _socket;
+
+	QByteArray _receiveBuffer;
+};

libsrc/jsonserver/JsonServer.cpp

@@ -0,0 +1,57 @@
+// system includes
+#include <stdexcept>
+
+// project includes
+#include <jsonserver/JsonServer.h>
+#include "JsonClientConnection.h"
+
+JsonServer::JsonServer(Hyperion *hyperion, uint16_t port) :
+	QObject(),
+	_hyperion(hyperion),
+	_server(),
+	_openConnections()
+{
+	if (!_server.listen(QHostAddress::Any, port))
+	{
+		throw std::runtime_error("Json server could not bind to port");
+	}
+
+	// Set trigger for incoming connections
+	connect(&_server, SIGNAL(newConnection()), this, SLOT(newConnection()));
+}
+
+JsonServer::~JsonServer()
+{
+	foreach (JsonClientConnection * connection, _openConnections) {
+		delete connection;
+	}
+}
+
+uint16_t JsonServer::getPort() const
+{
+	return _server.serverPort();
+}
+
+void JsonServer::newConnection()
+{
+	std::cout << "New incoming json connection" << std::endl;
+	QTcpSocket * socket = _server.nextPendingConnection();
+
+	if (socket != nullptr)
+	{
+		JsonClientConnection * connection = new JsonClientConnection(socket);
+		_openConnections.insert(connection);
+
+		// register slot for cleaning up after the connection closed
+		connect(connection, SIGNAL(connectionClosed(JsonClientConnection*)), this, SLOT(closedConnection(JsonClientConnection*)));
+	}
+}
+
+void JsonServer::closedConnection(JsonClientConnection *connection)
+{
+	std::cout << "Json connection closed" << std::endl;
+	_openConnections.remove(connection);
+
+	// schedule to delete the connection object
+	connection->deleteLater();
+}