125 lines
3.8 KiB
Rust
125 lines
3.8 KiB
Rust
use std::io::Write;
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//use std::os::unix::io::FromRawFd;
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use std::path::Path;
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use std::pin::Pin;
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use std::sync::{Arc, Mutex};
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use std::task::{Context, Poll};
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use std::thread;
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use anyhow::{format_err, Error};
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use futures::stream::Stream;
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use nix::dir::Dir;
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use nix::fcntl::OFlag;
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use nix::sys::stat::Mode;
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use crate::backup::CatalogWriter;
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/// Stream implementation to encode and upload .pxar archives.
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///
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/// The hyper client needs an async Stream for file upload, so we
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/// spawn an extra thread to encode the .pxar data and pipe it to the
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/// consumer.
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pub struct PxarBackupStream {
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rx: Option<std::sync::mpsc::Receiver<Result<Vec<u8>, Error>>>,
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child: Option<thread::JoinHandle<()>>,
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error: Arc<Mutex<Option<String>>>,
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}
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impl Drop for PxarBackupStream {
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fn drop(&mut self) {
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self.rx = None;
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self.child.take().unwrap().join().unwrap();
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}
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}
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impl PxarBackupStream {
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pub fn new<W: Write + Send + 'static>(
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dir: Dir,
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catalog: Arc<Mutex<CatalogWriter<W>>>,
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options: crate::pxar::PxarCreateOptions,
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) -> Result<Self, Error> {
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let (tx, rx) = std::sync::mpsc::sync_channel(10);
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let buffer_size = 256 * 1024;
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let error = Arc::new(Mutex::new(None));
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let child = std::thread::Builder::new()
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.name("PxarBackupStream".to_string())
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.spawn({
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let error = Arc::clone(&error);
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move || {
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let mut catalog_guard = catalog.lock().unwrap();
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let writer = std::io::BufWriter::with_capacity(
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buffer_size,
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crate::tools::StdChannelWriter::new(tx),
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);
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let verbose = options.verbose;
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let writer = pxar::encoder::sync::StandardWriter::new(writer);
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if let Err(err) = crate::pxar::create_archive(
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dir,
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writer,
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crate::pxar::Flags::DEFAULT,
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|path| {
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if verbose {
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println!("{:?}", path);
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}
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Ok(())
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},
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Some(&mut *catalog_guard),
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options,
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) {
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let mut error = error.lock().unwrap();
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*error = Some(err.to_string());
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}
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}
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})?;
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Ok(Self {
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rx: Some(rx),
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child: Some(child),
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error,
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})
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}
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pub fn open<W: Write + Send + 'static>(
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dirname: &Path,
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catalog: Arc<Mutex<CatalogWriter<W>>>,
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options: crate::pxar::PxarCreateOptions,
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) -> Result<Self, Error> {
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let dir = nix::dir::Dir::open(dirname, OFlag::O_DIRECTORY, Mode::empty())?;
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Self::new(
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dir,
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catalog,
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options,
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)
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}
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}
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impl Stream for PxarBackupStream {
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type Item = Result<Vec<u8>, Error>;
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fn poll_next(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Option<Self::Item>> {
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{
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// limit lock scope
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let error = self.error.lock().unwrap();
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if let Some(ref msg) = *error {
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return Poll::Ready(Some(Err(format_err!("{}", msg))));
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}
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}
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match crate::tools::runtime::block_in_place(|| self.rx.as_ref().unwrap().recv()) {
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Ok(data) => Poll::Ready(Some(data)),
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Err(_) => {
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let error = self.error.lock().unwrap();
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if let Some(ref msg) = *error {
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return Poll::Ready(Some(Err(format_err!("{}", msg))));
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}
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Poll::Ready(None) // channel closed, no error
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}
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}
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}
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}
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