cic-cli/cic/ext/eth/rpc.py

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# standard imports
import stat
import os
import logging
# external imports
from funga.eth.keystore.dict import DictKeystore
from funga.eth.signer import EIP155Signer
from chainlib.eth.cli import Rpc
from chainlib.cli import Wallet
# local imports
from cic.keystore import KeystoreDirectory
logg = logging.getLogger(__name__)
class EthKeystoreDirectory(DictKeystore, KeystoreDirectory):
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"""Combination of DictKeystore and KeystoreDirectory
TODO: Move to funga
"""
def parse_adapter(config, signer_hint):
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"""Determine and instantiate signer and rpc from configuration.
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If either could not be determined, None is returned.
:param config: Configuration object implementing the get() method
:type config: dict, object with get()
:param signer_hint: Signer resource description (e.g. keystore directory)
:type signer_hint: str
:rtype: tuple; chainlib.connection.RPCConnection, funga.signer.Signer
:return: RPC interface, signer interface
"""
keystore = None
if signer_hint is None:
logg.info("signer hint missing")
return None
st = os.stat(signer_hint)
if stat.S_ISDIR(st.st_mode):
logg.debug("signer hint is directory")
keystore = EthKeystoreDirectory()
keystore.process_dir(signer_hint)
w = Wallet(EIP155Signer, keystore=keystore)
signer = EIP155Signer(keystore)
rpc = Rpc(wallet=w)
rpc.connect_by_config(config)
return (rpc.conn, signer)