Struct LazyWalReader 

pub struct LazyWalReader { /* private fields */ }

Lazy WAL reader that separates header reading from payload reading.

Implementations

impl LazyWalReader

pub fn open(path: &Path) -> Result<Self>

Open a WAL file for lazy reading.

pub fn next_header(&mut self) -> Result<Option<RecordHeader>>

Read the next record header (30 bytes) without reading the payload.

Returns None at EOF or first corruption. After this call, use either read_payload() to get the payload or skip_payload() to seek past it.

pub fn read_payload(&mut self, header: &RecordHeader) -> Result<Vec<u8>>

Read the payload for a header that was just returned by next_header().

Must be called exactly once after next_header() returns Some, and before calling next_header() again (unless skip_payload() was called instead).

pub fn read_record(&mut self, header: &RecordHeader) -> Result<WalRecord>

Read the payload and return a full WalRecord.

pub fn skip_payload(&mut self, header: &RecordHeader) -> Result<()>

Skip the payload for a header, seeking forward without reading.

This is the key optimization: non-matching records skip I/O entirely.

pub fn offset(&self) -> u64

Current file offset.