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Since the daemon can detect when the client closes its peer-to-peer
connection, simplify the API by converting the Finish() method to a
Finished signal that is only emitted once.
Internally, add a "closed" signal to transactions (triggered by a
closed GDBusConnection), and have the transaction monitor use that
instead of "finished" to know when to dispose of the transaction.
Transaction progress and message signals are really only intended for
one recipient: the client that invoked the method. Use a peer-to-peer
connection for transactions so we're not spamming the system bus.
This entails returning a bus address rather than an object path in
methods that use transactions. The client opens a connection to the
bus address, connects handlers to the Transaction interface (on path
"/"), and then invokes the Start() method.
To finish a transaction, the client need only close the connection,
either explicitly or by terminating. The server will detect this
and clean up resources for that transaction.
Turns out we do still need a Start() method after all. Not for lack
of trying, but I can't get away from the client and server doing some
sort of handshake at the beginning to avoid either raciness on the
client side or artificial delays on the server side.
I don't particularly like the "start" signal I've added -- I'd much
prefer subclassing -- but I'm trying to keep the changes incremental.
The ProgressEnd signal indicates to clients there will be no more
DownloadProgress or SignatureProgress signals in the transaction,
and any further Message signals should be output as separate lines
instead of replacing the previous progress message.
In other words, it's just a way of driving GSConsole remotely.
A few changes:
- Modify the D-Bus API to include a Finish() method instead of a Start()
method, the idea being the client calls Finish() to obtain the final
status and optional message once the transaction indicates it's done.
Calling Finish() also removes the transaction object from the bus.
- Introduce Transaction class as a thin wrapper for RPMOSTreeTransaction.
Stores the status info for Finish(), detects when the caller's bus name
vanishes, and emits various status signals to TransactionMonitor.
- Introduce TransactionMonitor as a factory class for Transactions that
also handles book keeping chores like tracking the active Transaction.
The Sysroot and OS interfaces share a TransactionMonitor instance.
Returns the object path for the given OS name.
This can be done entirely client side, but it requires connecting to
the object manager interface, requesting all the objects and sifting
through them to find the one with a matching Name property.
For some use cases this method is just more convenient.
