Method validate_for_startup

nodedb/src/wal/manager/replay.rs:20–45

Validate each WAL segment for startup integrity. Returns `Err` if any non-empty segment contains no valid WAL records — a reliable signal that the segment was corrupted (wrong magic, truncated header, etc.) rather than simply rolled over empty. This check is intentionally strict: a segment file with content that does not parse as WAL records is treated as fatal corruption, not as an empty WAL. T

(&self)

    /// empty WAL. The WAL replay path is lenient (stops at the first invalid
    /// record) — this method is the complementary hard check run at startup.
    pub fn validate_for_startup(&self) -> crate::Result<()> {
        let segments =
            nodedb_wal::segment::discover_segments(&self.wal_dir).map_err(crate::Error::Wal)?;

        for seg in &segments {
            let file_len = std::fs::metadata(&seg.path).map(|m| m.len()).unwrap_or(0);

            if file_len == 0 {
                continue;
            }

            let info = nodedb_wal::recovery::recover(&seg.path).map_err(crate::Error::Wal)?;

            if info.end_offset == 0 {
                return Err(crate::Error::SegmentCorrupted {
                    detail: format!(
                        "WAL segment '{}' is non-empty ({file_len} bytes) but contains no valid \
                         WAL records — the segment appears to be corrupted",
                        seg.path.display()
                    ),
                });
            }
        }

        Ok(())
    }

    /// Replay all committed records from the WAL.
    pub fn replay(&self) -> crate::Result<Vec<WalRecord>> {