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The function timeout_add_seconds has quite a bit of variability. Using
timeout_add which specifies the timeout in ms instead of seconds. Testing
shows that this is much more consistent which should improve clients that
are using shorter timeouts for the API and the connection.
Added a properties changed signal on the job dbus object so that client
can wait for a signal that the job is complete instead of polling or
blocking on the wait method.
Allows the user to override the number of commands that get dumped
to the log when we encounter a lvm error. Also useful during
development when you don't want to see the blackbox output.
When reading data from stdout & stderr we were reading until the
reading until we got None back which really isn't needed as the
read will return everything that is available.
We need to acquire a lock which can block us which in turn causes
the dbus request handling to block as well. Place the request on
the work queue instead.
Our expectation was that when using the lvm shell that when the lvm prompt
was read from stdout, that all other ouput had been written and flushed.
However, this doesn't appear to be the case. Add extra read passes to
retrieve delayed report data.
In preparation to have more than one thread issuing commands to lvm
at the same time we need to serialize updates to the dbus state and
retrieving the global lvm state. To achieve this we have one thread
handling this with a thread safe queue taking and coalescing requests.
This code is no longer needed because the back ground task has been
removed. Will add back if we change the design and end up utilizing
multiple worker threads.
There is no reason to create another background task when the task that
created it is going to block waiting for it to finish. Instead we will
just execute the logic in the worker thread that is servicing the worker
queue.
Instead of creating a thread to handle the case where a client
is calling job.Wait, we will utilize a timer. This significantly
reduces the number of threads that get created and destroyed while
the service is running.
We will fetch the lvm state in non-main thread and only process the new
data with the main thread to prevent hanging the main thread event loop.
ref. https://bugs.freedesktop.org/show_bug.cgi?id=98521
