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use util::{H256, Hashable};
use std::collections::HashSet;
use ethcore::snapshot::ManifestData;
#[derive(PartialEq, Eq, Debug)]
pub enum ChunkType {
State(H256),
Block(H256),
}
pub struct Snapshot {
pending_state_chunks: Vec<H256>,
pending_block_chunks: Vec<H256>,
downloading_chunks: HashSet<H256>,
completed_chunks: HashSet<H256>,
snapshot_hash: Option<H256>,
}
impl Snapshot {
pub fn new() -> Snapshot {
Snapshot {
pending_state_chunks: Vec::new(),
pending_block_chunks: Vec::new(),
downloading_chunks: HashSet::new(),
completed_chunks: HashSet::new(),
snapshot_hash: None,
}
}
pub fn clear(&mut self) {
self.pending_state_chunks.clear();
self.pending_block_chunks.clear();
self.downloading_chunks.clear();
self.completed_chunks.clear();
self.snapshot_hash = None;
}
pub fn reset_to(&mut self, manifest: &ManifestData, hash: &H256) {
self.clear();
self.pending_state_chunks = manifest.state_hashes.clone();
self.pending_block_chunks = manifest.block_hashes.clone();
self.snapshot_hash = Some(hash.clone());
}
pub fn validate_chunk(&mut self, chunk: &[u8]) -> Result<ChunkType, ()> {
let hash = chunk.sha3();
if self.completed_chunks.contains(&hash) {
trace!(target: "sync", "Ignored proccessed chunk: {}", hash.hex());
return Err(());
}
self.downloading_chunks.remove(&hash);
if self.pending_block_chunks.iter().any(|h| h == &hash) {
self.completed_chunks.insert(hash.clone());
return Ok(ChunkType::Block(hash));
}
if self.pending_state_chunks.iter().any(|h| h == &hash) {
self.completed_chunks.insert(hash.clone());
return Ok(ChunkType::State(hash));
}
trace!(target: "sync", "Ignored unknown chunk: {}", hash.hex());
Err(())
}
pub fn needed_chunk(&mut self) -> Option<H256> {
let mut chunk = self.pending_state_chunks.iter()
.find(|&h| !self.downloading_chunks.contains(h) && !self.completed_chunks.contains(h))
.cloned();
if chunk.is_none() {
chunk = self.pending_block_chunks.iter()
.find(|&h| !self.downloading_chunks.contains(h) && !self.completed_chunks.contains(h))
.cloned();
}
if let Some(hash) = chunk {
self.downloading_chunks.insert(hash.clone());
}
chunk
}
pub fn clear_chunk_download(&mut self, hash: &H256) {
self.downloading_chunks.remove(hash);
}
pub fn snapshot_hash(&self) -> Option<H256> {
self.snapshot_hash
}
pub fn total_chunks(&self) -> usize {
self.pending_block_chunks.len() + self.pending_state_chunks.len()
}
pub fn done_chunks(&self) -> usize {
self.completed_chunks.len()
}
pub fn is_complete(&self) -> bool {
self.total_chunks() == self.completed_chunks.len()
}
}
#[cfg(test)]
mod test {
use util::*;
use super::*;
use ethcore::snapshot::ManifestData;
fn is_empty(snapshot: &Snapshot) -> bool {
snapshot.pending_block_chunks.is_empty() &&
snapshot.pending_state_chunks.is_empty() &&
snapshot.completed_chunks.is_empty() &&
snapshot.downloading_chunks.is_empty() &&
snapshot.snapshot_hash.is_none()
}
fn test_manifest() -> (ManifestData, H256, Vec<Bytes>, Vec<Bytes>) {
let state_chunks: Vec<Bytes> = (0..20).map(|_| H256::random().to_vec()).collect();
let block_chunks: Vec<Bytes> = (0..20).map(|_| H256::random().to_vec()).collect();
let manifest = ManifestData {
state_hashes: state_chunks.iter().map(|data| data.sha3()).collect(),
block_hashes: block_chunks.iter().map(|data| data.sha3()).collect(),
state_root: H256::new(),
block_number: 42,
block_hash: H256::new(),
};
let mhash = manifest.clone().into_rlp().sha3();
(manifest, mhash, state_chunks, block_chunks)
}
#[test]
fn create_clear() {
let mut snapshot = Snapshot::new();
assert!(is_empty(&snapshot));
let (manifest, mhash, _, _,) = test_manifest();
snapshot.reset_to(&manifest, &mhash);
assert!(!is_empty(&snapshot));
snapshot.clear();
assert!(is_empty(&snapshot));
}
#[test]
fn validate_chunks() {
let mut snapshot = Snapshot::new();
let (manifest, mhash, state_chunks, block_chunks) = test_manifest();
snapshot.reset_to(&manifest, &mhash);
assert_eq!(snapshot.done_chunks(), 0);
assert!(snapshot.validate_chunk(&H256::random().to_vec()).is_err());
let requested: Vec<H256> = (0..40).map(|_| snapshot.needed_chunk().unwrap()).collect();
assert!(snapshot.needed_chunk().is_none());
assert_eq!(&requested[0..20], &manifest.state_hashes[..]);
assert_eq!(&requested[20..40], &manifest.block_hashes[..]);
assert_eq!(snapshot.downloading_chunks.len(), 40);
assert_eq!(snapshot.validate_chunk(&state_chunks[4]), Ok(ChunkType::State(manifest.state_hashes[4].clone())));
assert_eq!(snapshot.completed_chunks.len(), 1);
assert_eq!(snapshot.downloading_chunks.len(), 39);
assert_eq!(snapshot.validate_chunk(&block_chunks[10]), Ok(ChunkType::Block(manifest.block_hashes[10].clone())));
assert_eq!(snapshot.completed_chunks.len(), 2);
assert_eq!(snapshot.downloading_chunks.len(), 38);
for (i, data) in state_chunks.iter().enumerate() {
if i != 4 {
assert!(snapshot.validate_chunk(data).is_ok());
}
}
for (i, data) in block_chunks.iter().enumerate() {
if i != 10 {
assert!(snapshot.validate_chunk(data).is_ok());
}
}
assert!(snapshot.is_complete());
assert_eq!(snapshot.done_chunks(), 40);
assert_eq!(snapshot.done_chunks(), snapshot.total_chunks());
assert_eq!(snapshot.snapshot_hash(), Some(manifest.into_rlp().sha3()));
}
}