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Even more snapshot validity checks (#2935)

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* clarify "cancelled periodic snapshot" message

* more rigorous checks for snapshot validity

* verify ancient blocks on import

* limit number of fed blocks

* make it possible to feed snapshot service canonical hashes

* fix failing test build

* swap ethash DAG only when more recent
This commit is contained in:
Robert Habermeier
2016-10-28 16:10:30 +02:00
committed by Gav Wood
parent 29ab4ecac1
commit 2806f1d4c9
9 changed files with 154 additions and 39 deletions
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21
ethash/src/lib.rs
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@@ -69,14 +69,19 @@ impl EthashManager {
Some(ref e) if *e == epoch => lights.recent.clone(),
_ => match lights.prev_epoch.clone() {
Some(e) if e == epoch => {
// swap
let t = lights.prev_epoch;
lights.prev_epoch = lights.recent_epoch;
lights.recent_epoch = t;
let t = lights.prev.clone();
lights.prev = lights.recent.clone();
lights.recent = t;
lights.recent.clone()
// don't swap if recent is newer.
if lights.recent_epoch > lights.prev_epoch {
None
} else {
// swap
let t = lights.prev_epoch;
lights.prev_epoch = lights.recent_epoch;
lights.recent_epoch = t;
let t = lights.prev.clone();
lights.prev = lights.recent.clone();
lights.recent = t;
lights.recent.clone()
}
}
_ => None,
},