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In preparation for the proxmox-backup-client look-ahead caching,
where a passing around of different encoder instances with internal
references is not feasible.
Instead of creating a new encoder instance for each directory level
and keeping references to the parent state, use an internal stack.
Adds additional helper functions to solve borrow issues, when both
the state and writers have to be accessed by a mutable reference.
This is a breaking change in the pxar library API.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Introduce an enum which stores 2 different possible variants of
inputs or outputs to be passed to encoder and decoder/accessor
instances, depending whether to read/write a fully self contained
pxar archive or whether to split off the payload stream into a
separate input/output.
Co-authored-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Make the skip part reusable for a different input.
In preparation for skipping payload paddings in a separated input.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
This exposes `decoder::aio::TokioReader<T>` in a similar manner to
`decoder::sync::StandardReader<T>`, which is necessary if one wants
to remain generic over `T: tokio::io::AsyncRead`, e.g.:
> struct FooDecoder<T: tokio::io::AsyncRead> {
> decoder: aio::Decoder<aio::TokioReader<T>>,
> }
Signed-off-by: Max Carrara <m.carrara@proxmox.com>
This change is needed in order to compare a file's metadata
in the coming proxmox-backup-debug diff tool.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
the type system guarantees that this can only be accessed by
a single mutable instance, but it's still a bad idea
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
it's provided by the tokio main package and we have an old
real package around which causes buildbot issues
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Returns a decoder::Contents without a wrapper type, since in this case
we don't want to hide the SeqRead implementation (as done in
decoder::sync). For conviencience also implement AsyncRead if "tokio-io"
is enabled.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
may more "explicit" than using `.as_mut().into()`, but
otherwise just seems like a useful addition to show the
lifetime constraints on this
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
To really use the encoder with async/await, it needs to support
SeqWrite implementations that are Send. This requires changing a whole
bunch of '&mut dyn SeqWrite' trait objects to instead take a 'T:
SeqWrite' generic parameter directly instead. Most of this is quite
straightforward, though incurs a lot of churn (FileImpl needs a generic
parameter now for example).
The trickiest part is returning a new Encoder instance in
create_directory, as the trait object trick with
SeqWrite::as_trait_object doesn't work if SeqWrite is implemented for
generic '&mut S'.
Instead, work with the generic object directly, and express the
owned/borrowed state in the Encoder (to avoid nested borrowing) as an
enum EncoderOutput.
Add to the aio test to ensure the Encoder is now actually useable.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
