async def process_blocks(wallet, ledger_api, last_known_header,
current_header_hash):
r = await ledger_api.hash_preimage(hash=current_header_hash)
header = Header.from_bytes(r)
body = Body.from_bytes(await
ledger_api.hash_preimage(hash=header.body_hash))
if header.previous_hash != last_known_header:
await process_blocks(wallet, ledger_api, last_known_header,
header.previous_hash)
print(f'processing block {HeaderHash(header)}')
additions = list(additions_for_body(body))
removals = removals_for_body(body)
removals = [
Coin.from_bytes(await ledger_api.hash_preimage(hash=x))
for x in removals
]
wallet.notify(additions, removals)
clawback_coins = [coin for coin in additions if wallet.is_in_escrow(coin)]
if len(clawback_coins) != 0:
print(f'WARNING! Coins from this wallet have been moved to escrow!\n'
f'Attempting to send a clawback for these coins:')
for coin in clawback_coins:
print(f'Coin ID: {coin.name()}, Amount: {coin.amount}')
transaction = wallet.generate_clawback_transaction(clawback_coins)
r = await ledger_api.push_tx(tx=transaction)
if type(r) is RemoteError:
print('Clawback failed')
else:
print('Clawback transaction submitted')
async def get_coin_age(coin, ledger_api, header_hash):
r = await ledger_api.get_tip()
if r['genesis_hash'] == header_hash:
return float('-inf')
r = await ledger_api.hash_preimage(hash=header_hash)
header = Header.from_bytes(r)
body = Body.from_bytes(await
ledger_api.hash_preimage(hash=header.body_hash))
additions = list(additions_for_body(body))
if coin in additions:
return 0
return 1 + await get_coin_age(coin, ledger_api, header.previous_hash)
async def get_unspent_coins(ledger_api, header_hash):
r = await ledger_api.get_tip()
if r['genesis_hash'] == header_hash:
return set()
r = await ledger_api.hash_preimage(hash=header_hash)
header = Header.from_bytes(r)
unspent_coins = await get_unspent_coins(ledger_api, header.previous_hash)
body = Body.from_bytes(await
ledger_api.hash_preimage(hash=header.body_hash))
additions = list(additions_for_body(body))
unspent_coins.update(additions)
removals = removals_for_body(body)
removals = [
Coin.from_bytes(await ledger_api.hash_preimage(hash=x))
for x in removals
]
unspent_coins.difference_update(removals)
return unspent_coins
async def sync(self):
"""
Get blocks from ledger sim and make a note of new and spent coins
that are "interesting".
"""
headers = []
tip_dict = await self._ledger_sim.get_tip()
genesis_hash = tip_dict["genesis_hash"]
header_hash = tip_dict["tip_hash"]
header_index = tip_dict["tip_index"]
while True:
if header_hash == genesis_hash:
break
if len(self._header_list
) >= header_index and header_hash == HeaderHash(
self._header_list[header_index - 1]):
break
preimage = await self._ledger_sim.hash_preimage(hash=header_hash)
header = Header.from_bytes(preimage)
headers.append(header)
header_hash = header.previous_hash
header_index -= 1
await self.rollback_to_block(header_index)
new_block_count = len(headers)
while headers:
header = headers.pop()
preimage = await self._ledger_sim.hash_preimage(
hash=header.body_hash)
body = Body.from_bytes(preimage)
additions = [
_ for _ in additions_for_body(body)
if _.puzzle_hash in self._interested_puzzled_hashes
]
removals = [
_ for _ in removals_for_body(body)
if _ in self._interested_puzzled_hashes
]
await apply_deltas(header_index, additions, removals, self, self)
self._header_list.append(header)
header_index += 1
return new_block_count