Function discover_segments

nodedb-wal/src/segment/discovery.rs:15–40

Discover all WAL segments in a directory, sorted by first_lsn. Ignores non-segment files (DWB files, other metadata).

(wal_dir: &Path)

///
/// Ignores non-segment files (DWB files, other metadata).
pub fn discover_segments(wal_dir: &Path) -> Result<Vec<SegmentMeta>> {
    if !wal_dir.exists() {
        return Ok(Vec::new());
    }

    let entries = fs::read_dir(wal_dir).map_err(WalError::Io)?;
    let mut segments = Vec::new();

    for entry in entries {
        let entry = entry.map_err(WalError::Io)?;
        let file_name = entry.file_name();
        let name = file_name.to_string_lossy();

        if let Some(first_lsn) = parse_segment_filename(&name) {
            let metadata = entry.metadata().map_err(WalError::Io)?;
            segments.push(SegmentMeta {
                path: entry.path(),
                first_lsn,
                file_size: metadata.len(),
            });
        }
    }

    segments.sort();
    Ok(segments)
}

#[cfg(test)]
mod tests {