This ensures that the BackupProvider will be stopped as soon as the
struct is dropped and the imex progress error event is emitted. This
makes it easier to use and also makes sure that the ffi call
dc_backup_provider_unref() does not lead to dangling resources.
This is a long running process and there has been at lease one crash
in this function. By owning both the context and the provider when
waiting we can avoid them being deallocated while we are still using
them.
To make the BackupProvider clonable this transforms all the errors
from it into Strings. These are clonable and how we report most our
errors anyway. The Future impl of BackupProvider then turns this into
an anyhow::Error so all other code can keep using anyhow as usual.
The documentation says this blocks. This should block because it also
means the error reporting is more accurate by calling set_last_error
just before returning.
Otherwise it is possible for the context that is used in the spawn to
be unreferenced. Really this should be caught by the borrow checker
that ensures we only spawn things with a 'static lifetime, but we're
handling raw pointers so it doesn't.
This adds a result extension trait to explicitly set the last error,
which *should* be the default for the FFI. Currently not touching all
APIs since that's potentially disruptive and we're close to a release.
The logging story is messy, as described in the doc comment. We
should further clean this up and tidy up these APIs so it's more
obvious to people how to do the right thing.
This makes the BackupProvider automatically invoke pause-io while it
is needed.
It needed to make the guard independent from the Context lifetime to
make this work. Which is a bit sad.
This fixes use-after-free in case dc_context_unref() is called
while the background process spawned by dc_configure() is still
running.
Corresponding regression test in Python can be run with
`pytest tests/test_1_online.py::test_configure_unref`.
the contrast was decreased at
https://github.com/deltachat/deltachat-core-rust/pull/4136 ,
there were also suggestions to fix it there,
but it was probably just forgotten :)
this pr increases the contrast
between code background and code font again to the level it was before
and also to what similar themes are doing.
