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watcher - Adds reorg protection for the LocatorCache

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Sergi Delgado Segura
2020-05-22 19:57:00 +02:00
parent 2a52006c03
commit 5af0658720
1 changed files with 24 additions and 0 deletions
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24
teos/watcher.py
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@@ -72,6 +72,26 @@ class LocatorCache:
self.blocks = OrderedDict(reversed((list(self.blocks.items()))))
def fix_cache(self, last_known_block, block_processor):
tmp_cache = LocatorCache(self.cache_size)
target_block_hash = last_known_block
for _ in range(self.cache_size):
target_block = block_processor.get_block(target_block_hash)
if target_block:
if target_block_hash in self.blocks:
tmp_cache.cache.update(self.blocks[target_block_hash])
tmp_cache.blocks[target_block_hash] = self.blocks[target_block_hash]
else:
locators = {compute_locator(txid): txid for txid in target_block.get("tx")}
tmp_cache.cache.update(locators)
tmp_cache.blocks[target_block_hash] = locators
target_block_hash = target_block.get("previousblockhash")
self.blocks = OrderedDict(reversed((list(tmp_cache.blocks.items()))))
self.cache = tmp_cache.cache
def is_full(self):
""" Returns whether the cache is full or not """
return len(self.blocks) > self.cache_size
@@ -290,6 +310,10 @@ class Watcher:
block = self.block_processor.get_block(block_hash)
logger.info("New block received", block_hash=block_hash, prev_block_hash=block.get("previousblockhash"))
# If a reorg is detected, the cache is fixed to cover the las `cache_size` blocks of the new chain
if self.last_known_block != block.get("previousblockhash"):
self.locator_cache.fix_cache(block_hash, self.block_processor)
txids = block.get("tx")
# Compute the locator for every transaction in the block and add them to the cache
locators_txid_map = {compute_locator(txid): txid for txid in txids}