128 lines
3.6 KiB
Rust
128 lines
3.6 KiB
Rust
use std::collections::HashSet;
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use std::io::Write;
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use std::os::unix::io::FromRawFd;
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use std::path::{Path, PathBuf};
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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 failure::*;
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use futures::stream::Stream;
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use nix::fcntl::OFlag;
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use nix::sys::stat::Mode;
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use nix::dir::Dir;
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use crate::pxar;
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use crate::backup::CatalogWriter;
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use crate::tools::wrapped_reader_stream::WrappedReaderStream;
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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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stream: Option<WrappedReaderStream<std::fs::File>>,
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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.stream = 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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pin_utils::unsafe_pinned!(stream: Option<WrappedReaderStream<std::fs::File>>);
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pub fn new<W: Write + Send + 'static>(
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mut dir: Dir,
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path: PathBuf,
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device_set: Option<HashSet<u64>>,
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verbose: bool,
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skip_lost_and_found: bool,
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catalog: Arc<Mutex<CatalogWriter<W>>>,
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) -> Result<Self, Error> {
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let (rx, tx) = nix::unistd::pipe()?;
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let buffer_size = 1024*1024;
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nix::fcntl::fcntl(rx, nix::fcntl::FcntlArg::F_SETPIPE_SZ(buffer_size as i32))?;
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let error = Arc::new(Mutex::new(None));
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let error2 = error.clone();
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let catalog = catalog.clone();
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let exclude_pattern = Vec::new();
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let child = thread::spawn(move || {
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let mut guard = catalog.lock().unwrap();
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let mut writer = unsafe { std::fs::File::from_raw_fd(tx) };
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if let Err(err) = pxar::Encoder::encode(
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path,
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&mut dir,
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&mut writer,
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Some(&mut *guard),
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device_set,
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verbose,
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skip_lost_and_found,
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pxar::flags::DEFAULT,
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exclude_pattern,
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) {
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let mut error = error2.lock().unwrap();
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*error = Some(err.to_string());
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}
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});
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let pipe = unsafe { std::fs::File::from_raw_fd(rx) };
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let stream = crate::tools::wrapped_reader_stream::WrappedReaderStream::new(pipe);
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Ok(Self {
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stream: Some(stream),
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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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device_set: Option<HashSet<u64>>,
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verbose: bool,
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skip_lost_and_found: bool,
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catalog: Arc<Mutex<CatalogWriter<W>>>,
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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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let path = std::path::PathBuf::from(dirname);
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Self::new(dir, path, device_set, verbose, skip_lost_and_found, catalog)
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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(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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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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let res = self.as_mut()
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.stream()
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.as_pin_mut()
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.unwrap()
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.poll_next(cx);
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Poll::Ready(futures::ready!(res)
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.map(|v| v.map_err(Error::from))
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)
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}
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}
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