def chain_without_block_validation(
base_db,
genesis_state):
"""
Return a Chain object containing just the genesis block.
This Chain does not perform any validation when importing new blocks.
The Chain's state includes one funded account and a private key for it,
which can be found in the funded_address and private_keys variables in the
chain itself.
"""
klass = MiningChain.configure(
__name__='TestChainWithoutBlockValidation',
vm_configuration=ConsensusApplier(NoProofConsensus).amend_vm_configuration(
(
(eth_constants.GENESIS_BLOCK_NUMBER, SpuriousDragonVM),
)
),
chain_id=1337,
)
genesis_params = {
'block_number': eth_constants.GENESIS_BLOCK_NUMBER,
'difficulty': eth_constants.GENESIS_DIFFICULTY,
'gas_limit': 3141592,
'parent_hash': eth_constants.GENESIS_PARENT_HASH,
'coinbase': eth_constants.GENESIS_COINBASE,
'nonce': eth_constants.GENESIS_NONCE,
'mix_hash': eth_constants.GENESIS_MIX_HASH,
'extra_data': eth_constants.GENESIS_EXTRA_DATA,
'timestamp': 1501851927,
}
chain = klass.from_genesis(base_db, genesis_params, genesis_state)
return chain
def disable_pow_check(chain_class: Type[ChainAPI]) -> Type[ChainAPI]:
"""
Disable the proof of work validation check for each of the chain's vms.
This allows for block mining without generation of the proof of work seal.
.. note::
blocks mined this way will not be importable on any chain that does not
have proof of work disabled.
"""
original_vms = chain_class.vm_configuration
no_pow_vms = ConsensusApplier(NoProofConsensus).amend_vm_configuration(original_vms)
return chain_class.configure(vm_configuration=no_pow_vms)