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b74788ea89
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 On the other hand, using a newer version of the underlying Qt QDataStream::Version should always increment the schema number since the NetworkMessage::Builder and NetworkMessage::Reader classes need to know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
349 lines
14 KiB
C++
349 lines
14 KiB
C++
#ifndef NETWORK_MESSAGE_HPP__
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#define NETWORK_MESSAGE_HPP__
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/*
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* WSJT-X Message Formats
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* ======================
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*
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* All messages are written or read using the QDataStream derivatives
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* defined below, note that we are using the default for floating
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* point precision which means all are double precision i.e. 64-bit
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* IEEE format.
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*
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* Message is big endian format
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*
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* Header format:
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*
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* 32-bit unsigned integer magic number 0xadbccbda
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* 32-bit unsigned integer schema number
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*
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* Payload format:
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*
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* As per the QDataStream format, see below for version used and
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* here:
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*
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* http://doc.qt.io/qt-5/datastreamformat.html
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*
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* for the serialization details for each type, at the time of
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* writing the above document is for Qt_5_0 format which is buggy
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* so we use Qt_5_4 format, differences are:
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*
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* QDateTime:
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* QDate qint64 Julian day number
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* QTime quint32 Milli-seconds since midnight
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* timespec quint8 0=local, 1=UTC, 2=Offset from UTC
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* (seconds)
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* 3=time zone
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* offset qint32 only present if timespec=2
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* timezone several-fields only present if timespec=3
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*
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* we will avoid using QDateTime fields with time zones for simplicity.
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*
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* Type utf8 is a utf-8 byte string formatted as a QByteArray for
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* serialization purposes (currently a quint32 size followed by size
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* bytes, no terminator is present or counted).
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*
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* The QDataStream format document linked above is not complete for
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* the QByteArray serialization format, it is similar to the QString
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* serialization format in that it differentiates between empty
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* strings and null strings. Empty strings have a length of zero
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* whereas null strings have a length field of 0xffffffff.
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*
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* Schema Negotiation
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* ------------------
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*
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* The NetworkMessage::Builder class specifies a schema number which
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* may be incremented from time to time. It represents a version of
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* the underlying encoding schemes used to store data items. Since the
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* underlying encoding is defined by the Qt project in it's
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* QDataStream stream operators, it is essential that clients and
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* servers of this protocol can agree on a common scheme. The
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* NetworkMessage utility classes below exchange the schema number
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* actually used. The handling of the schema is backwards compatible
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* to an extent, so long as clients and servers are written
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* correctly. For example a server written to any particular schema
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* version can communicate with a client written to a later schema.
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*
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* Schema Version 1:- this schema used the QDataStream::Qt_5_0 version
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* which is broken.
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*
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* Schema Version 2:- this schema uses the QDataStream::Qt_5_2 version.
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*
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* Schema Version 3:- this schema uses the QDataStream::Qt_5_4 version.
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*
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*
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*
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* Message Direction Value Type
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* ------------- --------- ---------------------- -----------
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* Heartbeat Out/In 0 quint32
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* Id (unique key) utf8
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* Maximum schema number quint32
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*
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* The heartbeat message shall be sent on a periodic basis every
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* NetworkMessage::pulse seconds (see below), the WSJT-X
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* application does that using the MessageClient class. This
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* message is intended to be used by servers to detect the presence
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* of a client and also the unexpected disappearance of a client
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* and by clients to learn the schema negotiated by the server
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* after it receives the initial heartbeat message from a client.
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* The message_aggregator reference server does just that using the
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* MessageServer class. Upon initial startup a client must send a
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* heartbeat message as soon as is practical, this message is used
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* to negotiate the maximum schema number common to the client and
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* server. Note that the server may not be able to support the
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* client's requested maximum schema number, in which case the
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* first message received from the server will specify a lower
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* schema number (never a higher one as that is not allowed). If a
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* server replies with a lower schema number then no higher than
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* that number shall be used for all further outgoing messages from
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* either clients or the server itself.
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*
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*
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* Status Out 1 quint32
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* Id (unique key) utf8
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* Dial Frequency (Hz) quint64
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* Mode utf8
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* DX call utf8
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* Report utf8
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* Tx Mode utf8
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* Tx Enabled bool
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* Transmitting bool
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*
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* WSJT-X sends this status message when various internal state
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* changes to allow the server to track the relevant state of each
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* client without the need for polling commands. The current state
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* changes that generate status messages are:
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*
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* Application start up,
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* "Enable Tx" button status changes,
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* Dial frequency changes,
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* Changes to the "DX Call" field,
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* Operating mode changes,
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* Transmit mode changed (in dual JT9+JT65 mode),
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* Changes to the "Rpt" spinner,
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* After an old decodes replay sequence (see Replay below),
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* When switching between Tx and Rx mode.
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*
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*
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* Decode Out 2 quint32
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* Id (unique key) utf8
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* New bool
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* Time QTime
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* snr qint32
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* Delta time (S) float (serialized as double)
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* Delta frequency (Hz) quint32
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* Mode utf8
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* Message utf8
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*
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* The decode message is send when a new decode is completed, in
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* this case the 'New' field is true. It is also used in response
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* to a "Replay" message where each old decode in the "Band
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* activity" window, that has not been erased, is sent in order
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* as a one of these messages with the 'New' field set to
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* false. See the "Replay" message below for details of usage.
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*
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*
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* Clear Out 3 quint32
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* Id (unique key) utf8
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*
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* This message is send when all prior "Decode" messages in the
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* "Band activity" window have been discarded and therefore are
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* no long available for actioning with a "Reply" message. It is
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* sent when the user erases the "Band activity" window and when
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* WSJT-X closes down normally. The server should discard all
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* decode messages upon receipt of this message.
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*
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*
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* Reply In 4 quint32
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* Id (target unique key) utf8
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* Time QTime
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* snr qint32
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* Delta time (S) float (serialized as double)
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* Delta frequency (Hz) quint32
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* Mode utf8
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* Message utf8
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*
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* In order for a server to provide a useful cooperative service
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* to WSJT-X it is possible for it to initiate a QSO by sending
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* this message to a client. WSJT-X filters this message and only
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* acts upon it if the message exactly describes a prior decode
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* and that decode is a CQ or QRZ message. The action taken is
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* exactly equivalent to the user double clicking the message in
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* the "Band activity" window. The intent of this message is for
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* servers to be able to provide an advanced look up of potential
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* QSO partners, for example determining if they have been worked
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* before or if working them may advance some objective like
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* award progress. The intention is not to provide a secondary
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* user interface for WSJT-X, it is expected that after QSO
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* initiation the rest of the QSO is carried out manually using
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* the normal WSJT-X user interface.
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*
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*
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* QSO Logged Out 5 quint32
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* Id (unique key) utf8
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* Date & Time QDateTime
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* DX call utf8
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* DX grid utf8
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* Dial frequency (Hz) quint64
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* Mode utf8
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* Report send utf8
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* Report received utf8
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* Tx power utf8
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* Comments utf8
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* Name utf8
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*
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* The QSO logged message is sent to the server(s) when the
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* WSJT-X user accepts the "Log QSO" dialog by clicking the "OK"
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* button.
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*
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*
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* Close Out 6 quint32
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* Id (unique key) utf8
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*
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* Close is sent by a client immediately prior to it shutting
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* down gracefully.
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*
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*
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* Replay In 7 quint32
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* Id (unique key) utf8
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*
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* When a server starts it may be useful for it to determine the
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* state of preexisting clients. Sending this message to each
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* client as it is discovered will cause that client (WSJT-X) to
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* send a "Decode" message for each decode currently in its "Band
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* activity" window. Each "Decode" message sent will have the
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* "New" flag set to false so that they can be distinguished from
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* new decodes. After all the old decodes have been broadcast a
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* "Status" message is also broadcast. If the server wishes to
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* determine the status of a newly discovered client; this
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* message should be used.
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*
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*
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* Halt Tx In 8
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* Id (unique key) utf8
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* Auto Tx Only bool
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*
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* The server may stop a client from transmitting messages either
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* immediately or at the end of the current transmission period
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* using this message.
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*
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*
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* Free Text In 9
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* Id (unique key) utf8
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* Text utf8
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* Send bool
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*
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* This message allows the server to set the current free text
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* message content. Sending this message with a non-empty "Text"
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* field is equivalent to typing a new message (old contents are
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* discarded) in to the WSJT-X free text message field or "Tx5"
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* field (both are updated) and if the "Send" flag is set then
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* clicking the "Now" radio button for the "Tx5" field if tab one
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* is current or clicking the "Free msg" radio button if tab two
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* is current.
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*
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* It is the responsibility of the sender to limit the length of
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* the message text and to limit it to legal message
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* characters. Despite this, it may be difficult for the sender
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* to determine the maximum message length without reimplementing
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* the complete message encoding protocol. Because of this is may
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* be better to allow any reasonable message length and to let
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* the WSJT-X application encode and possibly truncate the actual
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* on-air message.
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*
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* If the message text is empty the meaning of the message is
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* refined to send the current free text unchanged when the
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* "Send" flag is set or to clear the current free text when the
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* "Send" flag is unset. Note that this API does not include a
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* command to determine the contents of the current free text
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* message.
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*
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*/
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#include <QDataStream>
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#include "pimpl_h.hpp"
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class QIODevice;
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class QByteArray;
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class QString;
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namespace NetworkMessage
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{
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// NEVER DELETE MESSAGE TYPES
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enum Type
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{
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Heartbeat,
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Status,
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Decode,
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Clear,
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Reply,
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QSOLogged,
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Close,
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Replay,
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HaltTx,
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FreeText,
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maximum_message_type_ // ONLY add new message types
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// immediately before here
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};
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quint32 constexpr pulse {15}; // seconds
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//
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// NetworkMessage::Builder - build a message containing serialized Qt types
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//
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class Builder
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: public QDataStream
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{
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public:
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static quint32 constexpr magic {0xadbccbda}; // never change this
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// increment this if a newer Qt schema is required and add decode
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// logic to the Builder and Reader class implementations
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#if QT_VERSION >= 0x050400
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static quint32 constexpr schema_number {3};
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#elif QT_VERSION >= 0x050200
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static quint32 constexpr schema_number {2};
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#else
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// Schema 1 (Qt_5_0) is broken
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#error "Qt version 5.2 or greater required"
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#endif
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explicit Builder (QIODevice *, Type, QString const& id, quint32 schema);
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explicit Builder (QByteArray *, Type, QString const& id, quint32 schema);
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Builder (Builder const&) = delete;
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Builder& operator = (Builder const&) = delete;
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private:
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void common_initialization (Type type, QString const& id, quint32 schema);
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};
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//
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// NetworkMessage::Reader - read a message containing serialized Qt types
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//
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// Message is as per NetworkMessage::Builder above, the schema()
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// member may be used to determine the schema of the original
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// message.
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//
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class Reader
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: public QDataStream
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{
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public:
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explicit Reader (QIODevice *);
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explicit Reader (QByteArray const&);
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Reader (Reader const&) = delete;
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Reader& operator = (Reader const&) = delete;
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~Reader ();
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quint32 schema () const;
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Type type () const;
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QString id () const;
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private:
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class impl;
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pimpl<impl> m_;
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};
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}
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#endif
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