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Prune abandoned forks (#916)

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* Address compiler warning

* Prune abandoned fork choice forks

* New approach to pruning

* Wrap some block hashes in a newtype pattern

For increased type safety.

* Add Graphviz chain dump emitter for debugging

* Fix broken test case

* Make prunes_abandoned_forks use real DiskStore

* Mark finalized blocks in the GraphViz output

* Refine debug stringification of Slot and Epoch

Before this commit: print!("{:?}", Slot(123)) == "Slot(\n123\n)".
After this commit: print!("{:?", Slot(123)) == "Slot(123)".

* Simplify build_block()

* Rewrite test case using more composable test primitives

* Working rewritten test case

* Tighten fork prunning test checks

* Add another pruning test case

* Bugfix: Finalized blocks weren't always properly detected

* Pruning: Add pruning_does_not_touch_blocks_prior_to_finalization test case

* Tighten pruning tests: check if heads are tracked properly

* Add a failing test case for a buggy scenario

* Change name of function to a more accurate one

* Fix failing test case

* Test case: Were skipped slots' states pruned?

* Style fix: Simplify dereferencing

* Tighten pruning tests: check if abandoned states are deleted

* Towards atomicity of db ops

* Correct typo

* Prune also skipped slots' states

* New logic for handling skipped states

* Make skipped slots test pass

* Post conflict resolution fixes

* Formatting fixes

* Tests passing

* Block hashes in Graphviz node labels

* Removed unused changes

* Fix bug with states having < SlotsPerHistoricalRoot roots

* Consolidate State/BlockRootsIterator for pruning

* Address review feedback

* Fix a bug in pruning tests

* Detach prune_abandoned_forks() from its object

* Move migrate.rs from store to beacon_chain

* Move forks pruning onto a background thread

* Bugfix: Heads weren't pruned when prune set contained only the head

* Rename: freeze_to_state() -> process_finalization()

* Eliminate redundant function parameter

Co-authored-by: Michael Sproul <michael@sigmaprime.io>
This commit is contained in:
Adam Szkoda
2020-04-20 11:59:56 +02:00
committed by GitHub
parent b374ead24b
commit 9c3f76a33b
19 changed files with 1398 additions and 282 deletions
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13
beacon_node/beacon_chain/src/head_tracker.rs
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@@ -25,11 +25,22 @@ impl HeadTracker {
/// the upstream user.
pub fn register_block<E: EthSpec>(&self, block_root: Hash256, block: &BeaconBlock<E>) {
let mut map = self.0.write();
map.remove(&block.parent_root);
map.insert(block_root, block.slot);
}
/// Removes abandoned head.
pub fn remove_head(&self, block_root: Hash256) {
let mut map = self.0.write();
debug_assert!(map.contains_key(&block_root));
map.remove(&block_root);
}
/// Returns true iff `block_root` is a recognized head.
pub fn contains_head(&self, block_root: Hash256) -> bool {
self.0.read().contains_key(&block_root)
}
/// Returns the list of heads in the chain.
pub fn heads(&self) -> Vec<(Hash256, Slot)> {
self.0