def consensus_hash(db, field, previous_consensus_hash, content):
cursor = db.cursor()
block_index = util.CURRENT_BLOCK_INDEX
# Initialise previous hash on first block.
if block_index <= config.BLOCK_FIRST:
assert not previous_consensus_hash
previous_consensus_hash = util.dhash_string(CONSENSUS_HASH_SEED)
# Get previous hash.
if not previous_consensus_hash:
try:
previous_consensus_hash = list(
cursor.execute(
'''SELECT * FROM blocks WHERE block_index = ?''',
(block_index - 1, )))[0][field]
except IndexError:
previous_consensus_hash = None
if not previous_consensus_hash:
raise ConsensusError(
'Empty previous {} for block {}. Please launch a `reparse`.'.
format(field, block_index))
# Calculate current hash.
consensus_hash_version = CONSENSUS_HASH_VERSION_TESTNET if config.TESTNET else CONSENSUS_HASH_VERSION_MAINNET
calculated_hash = util.dhash_string(
previous_consensus_hash +
'{}{}'.format(consensus_hash_version, ''.join(content)))
# Verify hash (if already in database) or save hash (if not).
# NOTE: do not enforce this for messages_hashes, those are more informational (for now at least)
found_hash = list(
cursor.execute('''SELECT * FROM blocks WHERE block_index = ?''',
(block_index, )))[0][field] or None
if found_hash and field != 'messages_hash':
# Check against existing value.
if calculated_hash != found_hash:
raise ConsensusError(
'Inconsistent {} for block {} (calculated {}, vs {} in database).'
.format(field, block_index, calculated_hash, found_hash))
else:
# Save new hash.
cursor.execute(
'''UPDATE blocks SET {} = ? WHERE block_index = ?'''.format(field),
(calculated_hash, block_index))
# Check against checkpoints.
checkpoints = CHECKPOINTS_TESTNET if config.TESTNET else CHECKPOINTS_MAINNET
if field != 'messages_hash' and block_index in checkpoints and checkpoints[
block_index][field] != calculated_hash:
raise ConsensusError('Incorrect {} for block {}.'.format(
field, block_index))
return calculated_hash, found_hash
def consensus_hash(db, field, previous_consensus_hash, content):
cursor = db.cursor()
block_index = util.CURRENT_BLOCK_INDEX
# Initialise previous hash on first block.
if block_index <= config.BLOCK_FIRST:
assert not previous_consensus_hash
previous_consensus_hash = util.dhash_string(CONSENSUS_HASH_SEED)
# Get previous hash.
if not previous_consensus_hash:
try:
previous_consensus_hash = list(
cursor.execute("""SELECT * FROM blocks WHERE block_index = ?""", (block_index - 1,))
)[0][field]
except IndexError:
previous_consensus_hash = None
if not previous_consensus_hash:
raise ConsensusError(
"Empty previous {} for block {}. Please launch a `reparse`.".format(field, block_index)
)
# Calculate current hash.
consensus_hash_version = CONSENSUS_HASH_VERSION_TESTNET if config.TESTNET else CONSENSUS_HASH_VERSION_MAINNET
calculated_hash = util.dhash_string(
previous_consensus_hash + "{}{}".format(consensus_hash_version, "".join(content))
)
# Verify hash (if already in database) or save hash (if not).
# NOTE: do not enforce this for messages_hashes, those are more informational (for now at least)
found_hash = (
list(cursor.execute("""SELECT * FROM blocks WHERE block_index = ?""", (block_index,)))[0][field] or None
)
if found_hash and field != "messages_hash":
# Check against existing value.
if calculated_hash != found_hash:
raise ConsensusError(
"Inconsistent {} for block {} (calculated {}, vs {} in database).".format(
field, block_index, calculated_hash, found_hash
)
)
else:
# Save new hash.
cursor.execute(
"""UPDATE blocks SET {} = ? WHERE block_index = ?""".format(field), (calculated_hash, block_index)
)
# Check against checkpoints.
checkpoints = CHECKPOINTS_TESTNET if config.TESTNET else CHECKPOINTS_MAINNET
if field != "messages_hash" and block_index in checkpoints and checkpoints[block_index][field] != calculated_hash:
raise ConsensusError("Incorrect {} for block {}.".format(field, block_index))
return calculated_hash, found_hash
def consensus_hash(db, field, previous_consensus_hash, content):
cursor = db.cursor()
block_index = util.CURRENT_BLOCK_INDEX
# Initialise previous hash on first block.
if block_index == config.BLOCK_FIRST:
assert not previous_consensus_hash
previous_consensus_hash = util.dhash_string(CONSENSUS_HASH_SEED)
# Get previous hash.
if not previous_consensus_hash:
try:
previous_consensus_hash = list(cursor.execute('''SELECT * FROM blocks WHERE block_index = ?''', (block_index - 1,)))[0][field]
except IndexError:
previous_consensus_hash = None
if not previous_consensus_hash:
raise ConsensusError('Empty previous {} for block {}. Please launch a `reparse`.'.format(field, block_index))
# Calculate current hash.
consensus_hash_version = CONSENSUS_HASH_VERSION_TESTNET if config.TESTNET else CONSENSUS_HASH_VERSION_MAINNET
calculated_hash = util.dhash_string(previous_consensus_hash + '{}{}'.format(consensus_hash_version, ''.join(content)))
# Verify hash (if already in database) or save hash (if not).
found_hash = list(cursor.execute('''SELECT * FROM blocks WHERE block_index = ?''', (block_index,)))[0][field]
if found_hash:
# Check against existing value.
if calculated_hash != found_hash:
raise ConsensusError('Inconsistent {} for block {}.'.format(field, block_index))
else:
# Save new hash.
cursor.execute('''UPDATE blocks SET {} = ? WHERE block_index = ?'''.format(field), (calculated_hash, block_index))
# Check against checkpoints.
checkpoints = CHECKPOINTS_TESTNET if config.TESTNET else CHECKPOINTS_MAINNET
if block_index in checkpoints and checkpoints[block_index][field] != calculated_hash:
raise ConsensusError('Incorrect {} for block {}.'.format(field, block_index))
return calculated_hash
def insert_block(db, block_index, parse_block=True):
"""Add blocks to the blockchain."""
cursor = db.cursor()
block_hash = util.dhash_string(chr(block_index))
block_time = block_index * 1000
block = (block_index, block_hash, block_time, None, None, None, None)
cursor.execute('''INSERT INTO blocks (block_index, block_hash, block_time, ledger_hash, txlist_hash, previous_block_hash, difficulty)
VALUES (?,?,?,?,?,?,?)''', block)
util.CURRENT_BLOCK_INDEX = block_index # TODO: Correct?!
cursor.close()
if parse_block:
blocks.parse_block(db, block_index, block_time)
return block_index, block_hash, block_time
def insert_block(db, block_index, parse_block=True):
"""Add blocks to the blockchain."""
cursor = db.cursor()
block_hash = util.dhash_string(chr(block_index))
block_time = block_index * 1000
block = (block_index, block_hash, block_time, None, None, None, None)
cursor.execute('''INSERT INTO blocks (block_index, block_hash, block_time, ledger_hash, txlist_hash, previous_block_hash, difficulty)
VALUES (?,?,?,?,?,?,?)''', block)
util.CURRENT_BLOCK_INDEX = block_index # TODO: Correct?!
cursor.close()
if parse_block:
blocks.parse_block(db, block_index, block_time)
return block_index, block_hash, block_time
