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Count missing UTXOs and log just once

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They're a temporary phenomenon but it's handy to see how often
these things happen.  Fixes #10.
This commit is contained in:
Neil Booth 2016-11-09 07:29:45 +09:00
parent 55cc1d3d65
commit a07ed5876b
1 changed files with 14 additions and 5 deletions
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19
server/block_processor.py
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@ -175,6 +175,8 @@ class MemPool(LoggedClass):
''' '''
hex_hashes = set(hex_hashes) hex_hashes = set(hex_hashes)
touched = set() touched = set()
missing_utxos = 0
initial = self.count < 0 initial = self.count < 0
if initial: if initial:
self.logger.info('beginning import of {:,d} mempool txs' self.logger.info('beginning import of {:,d} mempool txs'
@ -225,10 +227,8 @@ class MemPool(LoggedClass):
return mempool_entry[1][txin.prev_idx], True return mempool_entry[1][txin.prev_idx], True
entry = utxo_lookup(txin.prev_hash, txin.prev_idx) entry = utxo_lookup(txin.prev_hash, txin.prev_idx)
if entry == NO_CACHE_ENTRY: if entry == NO_CACHE_ENTRY:
# Not possible unless daemon is lying or we're corrupted? # This happens when the daemon is a block ahead of us
self.logger.warning('no UTXO found for {} / {}' # and has mempool txs spending new txs in that block
.format(hash_to_str(txin.prev_hash),
txin.prev_idx))
raise MissingUTXOError raise MissingUTXOError
value, = struct.unpack('<Q', entry[-8:]) value, = struct.unpack('<Q', entry[-8:])
return (entry[:21], value), False return (entry[:21], value), False
@ -254,7 +254,11 @@ class MemPool(LoggedClass):
infos = (txin_info(txin) for txin in tx.inputs) infos = (txin_info(txin) for txin in tx.inputs)
txin_pairs, unconfs = zip(*infos) txin_pairs, unconfs = zip(*infos)
except MissingUTXOError: except MissingUTXOError:
# If we were missing a UTXO for some reason drop this tx # Drop this TX. If other mempool txs depend on it
# it's harmless - next time the mempool is refreshed
# they'll either be cleaned up or the UTXOs will no
# longer be missing.
missing_utxos += 1
del self.txs[hex_hash] del self.txs[hex_hash]
continue continue
self.txs[hex_hash] = (txin_pairs, txout_pairs, any(unconfs)) self.txs[hex_hash] = (txin_pairs, txout_pairs, any(unconfs))
@ -267,6 +271,11 @@ class MemPool(LoggedClass):
self.hash168s[hash168].add(hex_hash) self.hash168s[hash168].add(hex_hash)
touched.add(hash168) touched.add(hash168)
if missing_utxos:
self.logger.info('{:,d} txs had missing UTXOs; probably the '
'daemon is a block or two ahead of us'
.format(missing_utxos))
self.count += 1 self.count += 1
if self.count % 25 == 0 or gone: if self.count % 25 == 0 or gone:
self.count = 0 self.count = 0