chainlib-eth/example/online_transaction.py

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# standard imports
import sys
import os
# external imports
from crypto_dev_signer.keystore.dict import DictKeystore
from crypto_dev_signer.eth.signer import ReferenceSigner as EIP155Signer
from hexathon import (
add_0x,
strip_0x,
)
# local imports
from chainlib.chain import ChainSpec
from chainlib.eth.connection import EthHTTPConnection
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.gas import RPCGasOracle
from chainlib.eth.tx import (
TxFactory,
TxFormat,
)
from chainlib.error import JSONRPCException
# eth transactions need an explicit chain parameter as part of their signature
chain_spec = ChainSpec.from_chain_str('evm:ethereum:1')
# create keystore and signer
keystore = DictKeystore()
signer = EIP155Signer(keystore)
sender_address = keystore.new()
recipient_address = keystore.new()
# set up node connection
rpc_provider = os.environ.get('RPC_PROVIDER', 'http://localhost:8545')
rpc = EthHTTPConnection(rpc_provider)
# check the connection
if not rpc.check():
sys.stderr.write('node {} not usable\n'.format(rpc_provider))
sys.exit(1)
# nonce will now be retrieved from network
nonce_oracle = RPCNonceOracle(sender_address, rpc)
# gas price retrieved from network, and limit from callback
def calculate_gas(code=None):
return 21000
gas_oracle = RPCGasOracle(rpc, code_callback=calculate_gas)
# create a new transaction
tx_factory = TxFactory(chain_spec, signer=signer, nonce_oracle=nonce_oracle, gas_oracle=gas_oracle)
tx = tx_factory.template(sender_address, recipient_address, use_nonce=True)
tx['value'] = 1024
(tx_hash, tx_rpc) = tx_factory.finalize(tx)
print('transaction hash: ' + tx_hash)
print('jsonrpc payload: ' + str(tx_rpc))