Method load_meta

atomic-repository/src/redb_change_store/mod.rs:410–428

Load the metadata for a change. This reads only from CHANGE_META — the cheapest possible read. Useful for `atomic log`, header inspection, dependency resolution.

(&self, hash: &[u8; 32])

    /// This reads only from CHANGE_META — the cheapest possible read.
    /// Useful for `atomic log`, header inspection, dependency resolution.
    pub fn load_meta(&self, hash: &[u8; 32]) -> RedbStoreResult<StoredChangeMeta> {
        let txn = self.db.begin_read()?;
        let table = txn.open_table(tables::CHANGE_META)?;

        let value = table.get(hash)?.ok_or_else(|| RedbStoreError::NotFound {
            hash: format!(
                "{:02x}{:02x}{:02x}{:02x}…",
                hash[0], hash[1], hash[2], hash[3]
            ),
        })?;

        let compressed = value.value();
        let decompressed = zstd::decode_all(compressed)
            .map_err(|e| RedbStoreError::Corrupt(format!("meta decompression failed: {}", e)))?;
        let meta: StoredChangeMeta = postcard::from_bytes(&decompressed)
            .map_err(|e| RedbStoreError::Corrupt(format!("meta deserialization failed: {}", e)))?;

        Ok(meta)
    }

    // NOTE: load_change(), export_v3_file(), export_v3_bytes(), and
    // delete_change() are in queries.rs