def test_uncle_block_inclusion_validity(vm_fn):
# This test ensures that a forked block which is behind by
# more than 6 layers cannot act as an ancestor to the current block
OTHER_MINER_ADDRESS = 20 * b'\x01'
chain = build(
MiningChain,
vm_fn(0),
disable_pow_check(),
genesis(),
mine_block(), # 1
mine_block(), # 2
)
fork_chain = build(
chain,
at_block_number(1),
mine_block(extra_data=b'fork-it!',
coinbase=OTHER_MINER_ADDRESS), # fork 2
)
# we don't use canonical head here because the fork chain is non-canonical.
uncle = fork_chain.get_block_header_by_hash(fork_chain.header.parent_hash)
assert uncle.block_number == 2
with pytest.raises(ValidationError):
chain = build(
chain,
# Mines blocks from 3 to 8 (both numbers inclusive)
mine_blocks(6),
# Mine block 9 with uncle
mine_block(uncles=[uncle]),
)
def test_chain_builder_at_block_number(mining_chain):
pre_fork_chain = build(
mining_chain,
mine_block(), # 1
mine_block(), # 2
mine_block(), # 3
)
block_1 = pre_fork_chain.get_canonical_block_by_number(1)
block_2 = pre_fork_chain.get_canonical_block_by_number(2)
block_3 = pre_fork_chain.get_canonical_block_by_number(3)
chain = build(
pre_fork_chain,
at_block_number(2),
mine_block(extra_data=b'fork-it!'), # fork 3
mine_block(), # fork 4
mine_block(), # fork 5
)
# ensure that our chain is ahead of the pre_fork_chain
head = chain.get_canonical_head()
assert head.block_number == 5
pre_fork_head = pre_fork_chain.get_canonical_head()
assert pre_fork_head.block_number == 3
f_block_1 = chain.get_canonical_block_by_number(1)
f_block_2 = chain.get_canonical_block_by_number(2)
f_block_3 = chain.get_canonical_block_by_number(3)
# verify that the fork diverges from the pre_fork_chain
assert f_block_1 == block_1
assert f_block_2 == block_2
assert f_block_3 != block_3
def test_chain_builder_build_uncle_fork(mining_chain):
chain = build(
mining_chain,
mine_block(), # 1
mine_block(), # 2
)
fork_chain = build(
chain,
at_block_number(1),
mine_block(extra_data=b'fork-it!'), # fork 2
)
# we don't use canonical head here because the fork chain is non-canonical.
uncle = fork_chain.get_block_header_by_hash(fork_chain.header.parent_hash)
assert uncle.block_number == 2
assert uncle != chain.get_canonical_head()
chain = build(
chain,
mine_block(uncles=[uncle]), # 3
)
header = chain.get_canonical_head()
block = chain.get_block_by_hash(header.hash)
assert len(block.uncles) == 1
assert block.uncles[0] == uncle
def test_rewards_nephew_uncle_different_vm(vm_fn_uncle, vm_fn_nephew,
miner_1_balance, miner_2_balance):
OTHER_MINER_ADDRESS = 20 * b'\x01'
TOTAL_BLOCKS_CANONICAL_CHAIN = 10
VM_CHANGE_BLOCK_NUMBER = 4
chain = build(
MiningChain,
vm_fn_uncle(0),
vm_fn_nephew(VM_CHANGE_BLOCK_NUMBER),
disable_pow_check(),
genesis(),
mine_blocks(TOTAL_BLOCKS_CANONICAL_CHAIN - 1),
)
fork_chain = build(
chain,
at_block_number(3),
mine_block(extra_data=b'fork-it!',
coinbase=OTHER_MINER_ADDRESS), # fork 2
)
# we don't use canonical head here because the fork chain is non-canonical.
uncle = fork_chain.get_block_header_by_hash(fork_chain.header.parent_hash)
assert uncle.block_number == 4
chain = build(
chain,
mine_block(uncles=[uncle]),
)
header = chain.get_canonical_head()
block = chain.get_block_by_hash(header.hash)
assert len(block.uncles) == 1
assert block.uncles[0] == uncle
vm = chain.get_vm()
coinbase_balance = vm.state.get_balance(block.header.coinbase)
other_miner_balance = vm.state.get_balance(uncle.coinbase)
uncle_vm = chain.get_vm_class_for_block_number(0)
nephew_vm = chain.get_vm_class_for_block_number(VM_CHANGE_BLOCK_NUMBER)
# We first test if the balance matches what we would determine
# if we made all the API calls involved ourselves.
assert coinbase_balance == (uncle_vm.get_block_reward() * 3 +
nephew_vm.get_block_reward() *
(TOTAL_BLOCKS_CANONICAL_CHAIN - 3) +
vm.get_nephew_reward())
assert other_miner_balance == vm.get_uncle_reward(block.number, uncle)
# But we also ensure the balance matches the numbers that we calculated on paper
assert coinbase_balance == to_wei(miner_1_balance, 'ether')
assert other_miner_balance == to_wei(miner_2_balance, 'ether')
def test_rewards_uncle_created_at_different_generations(
vm_fn, fork_at_block_number, miner_1_balance, miner_2_balance):
OTHER_MINER_ADDRESS = 20 * b'\x01'
TOTAL_BLOCKS_CANONICAL_CHAIN = 10
chain = build(
MiningChain,
vm_fn(0),
disable_pow_check(),
genesis(),
mine_blocks(TOTAL_BLOCKS_CANONICAL_CHAIN - 1),
)
fork_chain = build(
chain,
at_block_number(fork_at_block_number),
mine_block(extra_data=b'fork-it!',
coinbase=OTHER_MINER_ADDRESS), # fork 2
)
# we don't use canonical head here because the fork chain is non-canonical.
uncle = fork_chain.get_block_header_by_hash(fork_chain.header.parent_hash)
assert uncle.block_number == fork_at_block_number + 1
chain = build(
chain,
mine_block(uncles=[uncle]),
)
header = chain.get_canonical_head()
block = chain.get_block_by_hash(header.hash)
vm = chain.get_vm()
coinbase_balance = vm.state.account_db.get_balance(block.header.coinbase)
other_miner_balance = vm.state.account_db.get_balance(uncle.coinbase)
# We first test if the balance matches what we would determine
# if we made all the API calls involved ourselves.
assert coinbase_balance == (
vm.get_block_reward() * TOTAL_BLOCKS_CANONICAL_CHAIN +
vm.get_nephew_reward())
assert other_miner_balance == vm.get_uncle_reward(block.number, uncle)
# But we also ensure the balance matches the numbers that we calculated on paper
assert coinbase_balance == to_wei(miner_1_balance, 'ether')
assert other_miner_balance == to_wei(miner_2_balance, 'ether')
