bfcb8c6dca
This complements the previous commit, which changed the broadcast datagram to CBOR. This commit changes the TCP protocol too. The protocol is an infinite array of commands, each of which is a map from an integer (the DataType enum) to either a string or null. The entire state machine for the connection is rewritten, relying on QCborStreamReader's ability to deal with incomplete data. Change-Id: Ic38ec929fc3f4bb795dafffd150ac674c32fac87 Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io> Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:BSD$
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** "Redistribution and use in source and binary forms, with or without
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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****************************************************************************/
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#ifndef CONNECTION_H
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#define CONNECTION_H
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#include <QCborStreamReader>
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#include <QCborStreamWriter>
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#include <QElapsedTimer>
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#include <QHostAddress>
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#include <QString>
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#include <QTcpSocket>
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#include <QTimer>
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static const int MaxBufferSize = 1024000;
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class Connection : public QTcpSocket
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{
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Q_OBJECT
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public:
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enum ConnectionState {
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WaitingForGreeting,
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ReadingGreeting,
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ReadyForUse
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};
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enum DataType {
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PlainText,
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Ping,
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Pong,
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Greeting,
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Undefined
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};
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Connection(QObject *parent = 0);
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Connection(qintptr socketDescriptor, QObject *parent = 0);
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~Connection();
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QString name() const;
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void setGreetingMessage(const QString &message);
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bool sendMessage(const QString &message);
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signals:
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void readyForUse();
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void newMessage(const QString &from, const QString &message);
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protected:
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void timerEvent(QTimerEvent *timerEvent) override;
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private slots:
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void processReadyRead();
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void sendPing();
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void sendGreetingMessage();
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private:
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bool hasEnoughData();
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void processGreeting();
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void processData();
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QCborStreamReader reader;
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QCborStreamWriter writer;
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QString greetingMessage;
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QString username;
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QTimer pingTimer;
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QElapsedTimer pongTime;
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QString buffer;
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ConnectionState state;
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DataType currentDataType;
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int transferTimerId;
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bool isGreetingMessageSent;
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};
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#endif
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