weavatrix-scan 0.4.6

Deterministic, safe repository scanner for code intelligence
Documentation 
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use super::*;

pub(super) fn content_file<'a>(
    root: &'a Path,
    root_index: usize,
    scanned: &'a ScannedFile,
    sequence: u64,
) -> ContentFile<'a> {
    ContentFile {
        root_index,
        sequence,
        root,
        absolute: &scanned.absolute,
        relative: &scanned.relative,
        bytes: scanned.bytes,
    }
}

#[allow(clippy::too_many_arguments)]
pub(super) fn emit_end<V>(
    visitor: &mut V,
    worker_index: usize,
    root: &Path,
    root_index: usize,
    scanned: &ScannedFile,
    sequence: u64,
    status: ContentFileStatus,
    bytes_read: u64,
    content_hash: Option<&str>,
    consumer_skipped: bool,
    options: &ScanOptions,
) -> bool
where
    V: for<'event> FnMut(ContentVisitEvent<'event>) -> ContentVisitControl,
{
    if visitor(ContentVisitEvent::FileEnd {
        worker_index,
        file: content_file(root, root_index, scanned, sequence),
        status,
        bytes_read,
        content_hash,
        consumer_skipped,
    }) == ContentVisitControl::Quit
    {
        cancel(options);
        true
    } else {
        false
    }
}

pub(super) fn cancel(options: &ScanOptions) {
    if let Some(cancellation) = &options.cancellation {
        cancellation.cancel();
    }
}

pub(crate) fn validate_cached(
    scanned: &mut ScannedFile,
    expected_fingerprint: &str,
) -> io::Result<CachedValidation> {
    let mut file = File::open(&scanned.absolute)?;
    let before = snapshot(&file)?;
    if before.bytes != scanned.bytes || !reusable(&scanned.version, &before.version) {
        return Ok(CachedValidation::Concurrent);
    }

    let mut fingerprint = ContentFingerprint::new();
    let mut bytes_read = 0_u64;
    let mut buffer = vec![0_u8; 64 * 1024].into_boxed_slice();
    loop {
        let read = file.read(&mut buffer)?;
        if read == 0 {
            break;
        }
        bytes_read = bytes_read.saturating_add(read as u64);
        fingerprint.write(&buffer[..read]);
    }

    let after = snapshot(&file)?;
    if bytes_read != before.bytes
        || before.bytes != after.bytes
        || !reusable(&before.version, &after.version)
    {
        return Ok(CachedValidation::Concurrent);
    }
    scanned.version = after.version;
    if fingerprint.finish() == expected_fingerprint {
        Ok(CachedValidation::Match)
    } else {
        Ok(CachedValidation::Changed)
    }
}