def start_web3connection(RPCaddress=None, account=None):
"""
get a web3 object, and make it global
"""
global w3
if RPCaddress:
# HTTP provider
# (TODO: also try whether IPC provider is faster, when quorum-outside-vagrant starts working)
w3 = Web3(HTTPProvider(RPCaddress, request_kwargs={'timeout': 120}))
else:
# w3 = Web3(Web3.EthereumTesterProvider()) # does NOT work!
w3 = Web3(Web3.TestRPCProvider())
print("web3 connection established, blockNumber =",
w3.eth.blockNumber,
end=", ")
#print ("node version string = ", w3.version.node)
print("node version string = ", w3.clientVersion)
accountname = "chosen"
if not account:
w3.eth.defaultAccount = w3.eth.accounts[
0] # set first account as sender
accountname = "first"
print(accountname + " account of node is", w3.eth.defaultAccount, end=", ")
print("balance is %s Ether" %
w3.fromWei(w3.eth.getBalance(w3.eth.defaultAccount), "ether"))
return w3
def get_eth_provider(provider_name):
# open a connection to a local ethereum node (ganache geth or simple in memory blockchain)
if provider_name == "in_memory_test_rpc":
return Web3.TestRPCProvider()
eth_providers = {
'local': HTTPProvider('http://localhost:9545'),
'rinkeby': Web3.IPCProvider(settings.RINKEBY_SOCKET_FILE_PATH),
}
return eth_providers[provider_name]
