apeirogond 0.15.2

Daemon for Apeirogon, a cross-platform software KVM
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// SPDX-License-Identifier: GPL-3.0-or-later

use std::io::{Seek, SeekFrom, Write};

use a7n_core::files::{EntryKind, ValidManifest};
use a7n_proto::{limits, v1::transfer_frame::Frame};
use sha2::Digest;
use std::sync::atomic::Ordering;

use super::super::{Failure, Progress, Result, staging::Staging};

pub(in crate::daemon::files) fn apply(
    state: &mut Staging,
    manifest: &ValidManifest,
    frame: Frame,
    progress: &Progress,
) -> Result<bool> {
    match frame {
        Frame::Chunk(chunk) => {
            let index = usize::try_from(chunk.file_index).map_err(|_| Failure::Invalid)?;
            let file = state
                .files
                .get_mut(index)
                .and_then(Option::as_mut)
                .ok_or(Failure::Invalid)?;
            let EntryKind::File { size, .. } = manifest.entries()[index].kind else {
                return Err(Failure::Invalid);
            };
            if file.ended
                || chunk.offset != file.written
                || chunk.data.len() > limits::CHUNK_MAX
                || (chunk.data.len() as u64) > size.saturating_sub(file.written)
            {
                return Err(Failure::Invalid);
            }
            if state
                .open
                .as_ref()
                .is_none_or(|(index, _)| *index != chunk.file_index)
            {
                let mut handle = a7n_platform::transfer_fs::open_file(&file.path, false, true)
                    .map_err(|_| Failure::Io)?;
                if handle.metadata().map_err(|_| Failure::Io)?.len() != file.written {
                    return Err(Failure::Io);
                }
                handle
                    .seek(SeekFrom::Start(file.written))
                    .map_err(|_| Failure::Io)?;
                state.open = Some((chunk.file_index, handle));
            }
            state
                .open
                .as_mut()
                .ok_or(Failure::Io)?
                .1
                .write_all(&chunk.data)
                .map_err(|_| Failure::Io)?;
            file.hash.update(&chunk.data);
            file.written += chunk.data.len() as u64;
            progress
                .bytes
                .fetch_add(chunk.data.len() as u64, Ordering::Relaxed);
        }
        Frame::FileEnd(end) => {
            let index = usize::try_from(end.file_index).map_err(|_| Failure::Invalid)?;
            let file = state
                .files
                .get_mut(index)
                .and_then(Option::as_mut)
                .ok_or(Failure::Invalid)?;
            let EntryKind::File { size, sha256 } = manifest.entries()[index].kind else {
                return Err(Failure::Invalid);
            };
            if file.ended {
                return Err(Failure::Invalid);
            }
            if file.written != size
                || end.sha256 != sha256
                || file.hash.clone().finalize().as_slice() != sha256
            {
                return Err(Failure::Integrity);
            }
            if let Some((index, handle)) = state.open.take() {
                handle.sync_all().map_err(|_| Failure::Io)?;
                if index != end.file_index {
                    state.open = Some((index, handle));
                }
            }
            file.ended = true;
            progress.files.fetch_add(1, Ordering::Relaxed);
        }
        Frame::Done(_) if state.files.iter().flatten().all(|file| file.ended) => return Ok(true),
        Frame::Abort(_) => return Err(Failure::Cancelled),
        _ => return Err(Failure::Invalid),
    }
    Ok(false)
}