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https://github.com/saitohirga/WSJT-X.git
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297e4c8755
The MessageClient and MessageServer classes now agree a maximum common schema number for the protocol described in NetworkMessage.hpp. this is achieved by the client sending a Heartbeat message specifying the highest schema number supported, the server responds with messages using the minimum of its highest supported schema number and the highest schema number sent by the client in its initial Heartbeat message. This mechanism enables clients and servers built with different generations of the message schema to interoperate with minimum loss of functionality. It should be noted that messages may be extended with new fields on the end of the current definition so long as the meaning of the original fields are unchanged. Such an extension does not need the schema number to be incremented. On the other hand, using a newer version of the underlying Qt QDataStream::Version should always increment the schema number since the NetworkMessage::Builder and NetworkMessage::Reader classes need to know which QDataStream::Version to use. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5991 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
384 lines
10 KiB
C++
384 lines
10 KiB
C++
#include "MessageClient.hpp"
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#include <stdexcept>
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#include <QUdpSocket>
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#include <QHostInfo>
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#include <QTimer>
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#include <QQueue>
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#include <QByteArray>
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#include <QHostAddress>
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#include "NetworkMessage.hpp"
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#include "pimpl_impl.hpp"
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#include "moc_MessageClient.cpp"
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class MessageClient::impl
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: public QUdpSocket
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{
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Q_OBJECT;
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public:
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impl (QString const& id, port_type server_port, MessageClient * self)
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: self_ {self}
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, id_ {id}
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, server_port_ {server_port}
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, schema_ {2} // use 2 prior to negotiation not 1 which is broken
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, heartbeat_timer_ {new QTimer {this}}
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{
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connect (heartbeat_timer_, &QTimer::timeout, this, &impl::heartbeat);
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connect (this, &QIODevice::readyRead, this, &impl::pending_datagrams);
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heartbeat_timer_->start (NetworkMessage::pulse * 1000);
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// bind to an ephemeral port
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bind ();
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}
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~impl ()
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{
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closedown ();
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}
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enum StreamStatus {Fail, Short, OK};
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void parse_message (QByteArray const& msg);
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void pending_datagrams ();
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void heartbeat ();
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void closedown ();
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StreamStatus check_status (QDataStream const&) const;
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void send_message (QByteArray const&);
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Q_SLOT void host_info_results (QHostInfo);
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MessageClient * self_;
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QString id_;
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QString server_string_;
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port_type server_port_;
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QHostAddress server_;
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quint32 schema_;
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QTimer * heartbeat_timer_;
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// hold messages sent before host lookup completes asynchronously
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QQueue<QByteArray> pending_messages_;
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};
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#include "MessageClient.moc"
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void MessageClient::impl::host_info_results (QHostInfo host_info)
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{
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if (QHostInfo::NoError != host_info.error ())
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{
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Q_EMIT self_->error ("UDP server lookup failed:\n" + host_info.errorString ());
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pending_messages_.clear (); // discard
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}
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else if (host_info.addresses ().size ())
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{
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server_ = host_info.addresses ()[0];
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// send initial heartbeat which allows schema negotiation
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heartbeat ();
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// clear any backlog
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while (pending_messages_.size ())
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{
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send_message (pending_messages_.dequeue ());
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}
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}
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}
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void MessageClient::impl::pending_datagrams ()
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{
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while (hasPendingDatagrams ())
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{
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QByteArray datagram;
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datagram.resize (pendingDatagramSize ());
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QHostAddress sender_address;
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port_type sender_port;
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if (0 <= readDatagram (datagram.data (), datagram.size (), &sender_address, &sender_port))
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{
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parse_message (datagram);
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}
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}
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}
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void MessageClient::impl::parse_message (QByteArray const& msg)
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{
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try
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{
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//
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// message format is described in NetworkMessage.hpp
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//
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NetworkMessage::Reader in {msg};
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if (OK == check_status (in) && id_ == in.id ()) // OK and for us
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{
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if (schema_ < in.schema ()) // one time record of server's
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// negotiated schema
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{
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schema_ = in.schema ();
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}
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//
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// message format is described in NetworkMessage.hpp
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//
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switch (in.type ())
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{
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case NetworkMessage::Reply:
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{
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// unpack message
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QTime time;
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qint32 snr;
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float delta_time;
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quint32 delta_frequency;
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QByteArray mode;
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QByteArray message;
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in >> time >> snr >> delta_time >> delta_frequency >> mode >> message;
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if (check_status (in) != Fail)
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{
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Q_EMIT self_->reply (time, snr, delta_time, delta_frequency
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, QString::fromUtf8 (mode), QString::fromUtf8 (message));
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}
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}
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break;
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case NetworkMessage::Replay:
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if (check_status (in) != Fail)
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{
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Q_EMIT self_->replay ();
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}
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break;
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case NetworkMessage::HaltTx:
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{
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bool auto_only {false};
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in >> auto_only;
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if (check_status (in) != Fail)
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{
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Q_EMIT self_->halt_tx (auto_only);
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}
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}
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break;
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case NetworkMessage::FreeText:
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{
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QByteArray message;
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bool send {true};
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in >> message >> send;
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if (check_status (in) != Fail)
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{
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Q_EMIT self_->free_text (QString::fromUtf8 (message), send);
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}
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}
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break;
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default:
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// Ignore
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break;
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}
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}
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}
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catch (std::exception const& e)
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{
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Q_EMIT self_->error (QString {"MessageClient exception: %1"}.arg (e.what ()));
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}
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catch (...)
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{
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Q_EMIT self_->error ("Unexpected exception in MessageClient");
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}
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}
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void MessageClient::impl::heartbeat ()
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{
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if (server_port_ && !server_.isNull ())
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{
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QByteArray message;
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NetworkMessage::Builder hb {&message, NetworkMessage::Heartbeat, id_, schema_};
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hb << NetworkMessage::Builder::schema_number; // maximum schema number accepted
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if (OK == check_status (hb))
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{
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writeDatagram (message, server_, server_port_);
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}
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}
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}
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void MessageClient::impl::closedown ()
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{
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if (server_port_ && !server_.isNull ())
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{
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QByteArray message;
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NetworkMessage::Builder out {&message, NetworkMessage::Close, id_, schema_};
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if (OK == check_status (out))
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{
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writeDatagram (message, server_, server_port_);
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}
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}
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}
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void MessageClient::impl::send_message (QByteArray const& message)
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{
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if (server_port_)
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{
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if (!server_.isNull ())
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{
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writeDatagram (message, server_, server_port_);
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}
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else
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{
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pending_messages_.enqueue (message);
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}
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}
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}
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auto MessageClient::impl::check_status (QDataStream const& stream) const -> StreamStatus
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{
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auto stat = stream.status ();
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StreamStatus result {Fail};
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switch (stat)
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{
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case QDataStream::ReadPastEnd:
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result = Short;
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break;
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case QDataStream::ReadCorruptData:
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Q_EMIT self_->error ("Message serialization error: read corrupt data");
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break;
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case QDataStream::WriteFailed:
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Q_EMIT self_->error ("Message serialization error: write error");
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break;
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default:
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result = OK;
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break;
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}
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return result;
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}
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MessageClient::MessageClient (QString const& id, QString const& server, port_type server_port, QObject * self)
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: QObject {self}
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, m_ {id, server_port, this}
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{
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connect (&*m_, static_cast<void (impl::*) (impl::SocketError)> (&impl::error)
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, [this] (impl::SocketError /* e */)
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{
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Q_EMIT error (m_->errorString ());
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});
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set_server (server);
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}
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QHostAddress MessageClient::server_address () const
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{
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return m_->server_;
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}
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auto MessageClient::server_port () const -> port_type
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{
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return m_->server_port_;
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}
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void MessageClient::set_server (QString const& server)
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{
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m_->server_.clear ();
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m_->server_string_ = server;
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if (!server.isEmpty ())
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{
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// queue a host address lookup
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QHostInfo::lookupHost (server, &*m_, SLOT (host_info_results (QHostInfo)));
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}
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}
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void MessageClient::set_server_port (port_type server_port)
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{
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m_->server_port_ = server_port;
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}
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void MessageClient::send_raw_datagram (QByteArray const& message, QHostAddress const& dest_address
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, port_type dest_port)
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{
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if (dest_port && !dest_address.isNull ())
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{
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m_->writeDatagram (message, dest_address, dest_port);
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}
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}
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void MessageClient::status_update (Frequency f, QString const& mode, QString const& dx_call
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, QString const& report, QString const& tx_mode
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, bool tx_enabled, bool transmitting)
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{
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if (m_->server_port_ && !m_->server_string_.isEmpty ())
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{
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QByteArray message;
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NetworkMessage::Builder out {&message, NetworkMessage::Status, m_->id_, m_->schema_};
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out << f << mode.toUtf8 () << dx_call.toUtf8 () << report.toUtf8 () << tx_mode.toUtf8 ()
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<< tx_enabled << transmitting;
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if (impl::OK == m_->check_status (out))
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{
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m_->send_message (message);
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}
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else
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{
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Q_EMIT error ("Error creating UDP message");
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}
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}
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}
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void MessageClient::decode (bool is_new, QTime time, qint32 snr, float delta_time, quint32 delta_frequency
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, QString const& mode, QString const& message_text)
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{
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if (m_->server_port_ && !m_->server_string_.isEmpty ())
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{
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QByteArray message;
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NetworkMessage::Builder out {&message, NetworkMessage::Decode, m_->id_, m_->schema_};
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out << is_new << time << snr << delta_time << delta_frequency << mode.toUtf8 () << message_text.toUtf8 ();
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if (impl::OK == m_->check_status (out))
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{
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m_->send_message (message);
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}
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else
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{
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Q_EMIT error ("Error creating UDP message");
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}
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}
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}
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void MessageClient::clear_decodes ()
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{
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if (m_->server_port_ && !m_->server_string_.isEmpty ())
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{
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QByteArray message;
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NetworkMessage::Builder out {&message, NetworkMessage::Clear, m_->id_, m_->schema_};
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if (impl::OK == m_->check_status (out))
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{
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m_->send_message (message);
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}
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else
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{
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Q_EMIT error ("Error creating UDP message");
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}
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}
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}
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void MessageClient::qso_logged (QDateTime time, QString const& dx_call, QString const& dx_grid
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, Frequency dial_frequency, QString const& mode, QString const& report_sent
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, QString const& report_received, QString const& tx_power
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, QString const& comments, QString const& name)
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{
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if (m_->server_port_ && !m_->server_string_.isEmpty ())
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{
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QByteArray message;
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NetworkMessage::Builder out {&message, NetworkMessage::QSOLogged, m_->id_, m_->schema_};
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out << time << dx_call.toUtf8 () << dx_grid.toUtf8 () << dial_frequency << mode.toUtf8 ()
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<< report_sent.toUtf8 () << report_received.toUtf8 () << tx_power.toUtf8 () << comments.toUtf8 () << name.toUtf8 ();
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if (impl::OK == m_->check_status (out))
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{
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m_->send_message (message);
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}
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else
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{
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Q_EMIT error ("Error creating UDP message");
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}
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}
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}
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