Struct ethcore::snapshot::io::PackedWriter

pub struct PackedWriter { /* private fields */ }

A packed snapshot writer. This writes snapshots to a single concatenated file.

The file format is very simple and consists of three parts: [Concatenated chunk data] [manifest as RLP] [manifest start offset (8 bytes little-endian)]

The manifest contains all the same information as a standard ManifestData, but also maps chunk hashes to their lengths and offsets in the file for easy reading.

Implementations

impl PackedWriter

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

Create a new “PackedWriter”, to write into the file at the given path.

Trait Implementations

impl SnapshotWriter for PackedWriter

fn write_state_chunk(&mut self, hash: H256, chunk: &[u8]) -> Result<()>

Write a compressed state chunk.

fn write_block_chunk(&mut self, hash: H256, chunk: &[u8]) -> Result<()>

Write a compressed block chunk.

fn finish(self, manifest: ManifestData) -> Result<()>

Complete writing. The manifest’s chunk lists must be consistent with the chunks written.