Extraction wasn't cancellable by `cancel_on_user_sig_term` used in `entry` since it calls `block_in_place`.
This PR adds cancellation support to it by adding a `static` variable `OnceCell` to `wait_on_cancellation_signal` so that once it returns `Ok(())`, all other calls to it after that point also returns `Ok(())` immediately.
`StreamReadable`, which is used in cancellation process, then stores a boxed future of `wait_on_cancellation_signal` and polled it in `BufReader::fill_buf`.
Note that for zip, the extraction process takes `File` instead of `StreamReadable` due to `io::Seek` requirement, so it cancelling during extraction for zip is still not possible.
This PR also optimized `extract_bin` and `extract_zip` by using `StreamReadable::copy` introduced to this PR instead of `io::copy`, which allocates an internal buffer on stack, which imposes extra copy.
It also fixed `StreamReadable::fill_buf` by ensuring that empty buffer is only returned on eof.
* Make `wait_on_cancellation_signal` pub
* Enable feature `parking_lot` of dep tokio
* Mod `wait_on_cancellation_signal`: Use `OnceCell` internally
to archive the effect that once call to it return `Ok(())`, all calls to
it after that also returns `Ok(())`.
* Impl `From<BinstallError>` for `io::Error`
* Impl cancellation on user signal in `StreamReadable`
* Fix err msg when cancelling during extraction in `ops::resolve`
* Optimize: Impl & use `StreamReadable::copy`
which is same as `io::copy` but does not allocate any internal buffer
since `StreamReadable` is buffered.
* Fix `next_stream`: Return non-empty bytes on `Ok(Some(bytes))`
Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
