def create():
"""
Creates an escrow which manages mining
"""
chain = blockchain.chain()
creator = chain.web3.eth.accounts[0] # TODO: make it possible to override
tok = token.get()
escrow, tx = chain.provider.get_or_deploy_contract(
ESCROW_NAME,
deploy_args=[token.get().address] + MINING_COEFF,
deploy_transaction={'from': creator})
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
tx = tok.transact({'from': creator}).addMiner(escrow.address)
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
return escrow
def create():
"""
Creates a contract with tokens and returns it.
If it was already created, just returns the already existing contract
:returns: Token contract object
"""
chain = blockchain.chain()
web3 = chain.web3
creator = web3.eth.accounts[0] # TODO: make it possible to override
token, tx = chain.provider.get_or_deploy_contract(
CONTRACT_NAME,
deploy_args=[PREMINE, SATURATION],
deploy_transaction={'from': creator})
if tx:
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
return token
def lock(amount: int, locktime: int, address: str = None):
"""
Deposit and lock coins for mining. Creating coins starts after it is done
:param amount: Amount of coins to lock (in smallest indivisible
units)
:param locktime: Locktime in periods
:param address: Optional address to get coins from (accounts[0] by
default)
"""
chain = blockchain.chain()
address = address or chain.web3.eth.accounts[0]
escrow = nkms_eth.escrow.get()
tx = token.get().transact({
'from': address
}).approve(escrow.address, amount)
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
tx = escrow.transact({'from': address}).deposit(amount, locktime)
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
tx = escrow.transact({'from': address}).switchLock()
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
def withdraw(address: str = None):
chain = blockchain.chain()
address = address or chain.web3.eth.accounts[0]
escrow = nkms_eth.escrow.get()
tx = escrow.transact({'from': address}).withdrawAll()
chain.wait.for_receipt(tx, timeout=blockchain.TIMEOUT)
def get(name=CONTRACT_NAME):
"""
Gets an existing contract or returns an error
"""
return blockchain.chain().provider.get_contract(name)