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(vm_fn, miner_1_balance, miner_2_balance):
OTHER_MINER_ADDRESS = 20 * b'\x01'
TOTAL_BLOCKS_CANONICAL_CHAIN = 3
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
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
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')
def test_chain_builder_build_mine_multiple_blocks(mining_chain):
chain = build(
mining_chain,
mine_blocks(5),
)
header = chain.get_canonical_head()
assert header.block_number == 5
def test_chain_builder_construct_chain_name():
chain = build(
MiningChain,
name('ChainForTest'),
)
assert issubclass(chain, MiningChain)
assert chain.__name__ == 'ChainForTest'
def test_chain_builder_without_any_mining_config():
chain = build(
MiningChain,
frontier_at(0),
genesis(),
)
with pytest.raises(ValidationError, match='mix hash mismatch'):
chain.mine_block()
def test_chain_builder_build_single_default_block(mining_chain):
chain = build(
mining_chain,
mine_block(),
)
header = chain.get_canonical_head()
assert header.block_number == 1
def test_chain_builder_mine_block_with_parameters(mining_chain):
chain = build(
mining_chain,
mine_block(extra_data=b'test-setting-extra-data'),
)
header = chain.get_canonical_head()
assert header.extra_data == b'test-setting-extra-data'
def test_chain_import_blocks_many(mining_chain):
temp_chain = build(
mining_chain,
copy(),
mine_blocks(3),
)
block_1, block_2, block_3 = (
temp_chain.get_canonical_block_by_number(1),
temp_chain.get_canonical_block_by_number(2),
temp_chain.get_canonical_block_by_number(3),
)
chain = build(
mining_chain,
import_blocks(block_1, block_2, block_3),
)
head = chain.get_canonical_head()
assert head == block_3.header
def test_chain_builder_construct_chain_vm_configuration_single_fork():
chain = build(
MiningChain,
fork_at(FrontierVM, 0),
)
assert issubclass(chain, MiningChain)
assert len(chain.vm_configuration) == 1
assert chain.vm_configuration[0][0] == 0
assert chain.vm_configuration[0][1] == FrontierVM
def test_chain_builder_construct_chain_vm_configuration_multiple_forks():
chain = build(
MiningChain,
fork_at(FrontierVM, 0),
fork_at(HomesteadVM, 5),
)
assert issubclass(chain, MiningChain)
assert len(chain.vm_configuration) == 2
assert chain.vm_configuration[0][0] == 0
assert chain.vm_configuration[0][1] == FrontierVM
assert chain.vm_configuration[1][0] == 5
assert chain.vm_configuration[1][1] == HomesteadVM
def test_chain_builder_enable_pow_mining():
chain = build(
MiningChain,
frontier_at(0),
enable_pow_mining(),
genesis(),
)
block = chain.mine_block()
check_pow(
block.number,
block.header.mining_hash,
block.header.mix_hash,
block.header.nonce,
block.header.difficulty,
)
def test_chain_builder_disable_pow_check():
chain = build(
MiningChain,
frontier_at(0),
disable_pow_check(),
genesis(),
)
block = chain.mine_block()
with pytest.raises(ValidationError, match='mix hash mismatch'):
check_pow(
block.number,
block.header.mining_hash,
block.header.mix_hash,
block.header.nonce,
block.header.difficulty,
)
def test_chain_builder_construct_chain_fork_specific_helpers(
fork_fn, vm_class):
class DummyVM(FrontierVM):
pass
class ChainForTest(MiningChain):
vm_configuration = ((0, DummyVM), )
chain = build(
ChainForTest,
fork_fn(12),
)
assert issubclass(chain, MiningChain)
assert len(chain.vm_configuration) == 2
assert chain.vm_configuration[0][0] == 0
assert chain.vm_configuration[0][1] is DummyVM
assert chain.vm_configuration[1][0] == 12
assert chain.vm_configuration[1][1] is vm_class
def test_chain_builder_chain_split(mining_chain):
chain_a, chain_b = build(
mining_chain,
chain_split(
(mine_block(extra_data=b'chain-a'), mine_block()),
(mine_block(extra_data=b'chain-b'), mine_block(), mine_block()),
),
)
first_a = chain_a.get_canonical_block_by_number(1).header
first_b = chain_b.get_canonical_block_by_number(1).header
assert first_a.extra_data == b'chain-a'
assert first_b.extra_data == b'chain-b'
head_a = chain_a.get_canonical_head()
assert head_a.block_number == 2
head_b = chain_b.get_canonical_head()
assert head_b.block_number == 3
def any_chain(request):
return build(*request.param)
def regular_chain():
return build(*REGULAR_CHAIN_PARAMS)
def mining_chain():
return build(*MINING_CHAIN_PARAMS)
