chainlib-eth/example/jsonrpc_factory.py

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2021-08-21 09:27:40 +02:00
# standard imports
import os
import sys
# local imports
from chainlib.jsonrpc import JSONRPCRequest
from chainlib.chain import ChainSpec
from chainlib.connection import (
JSONRPCHTTPConnection,
RPCConnection,
ConnType,
)
# set up node connection and execute rpc call
rpc_provider = os.environ.get('RPC_PROVIDER', 'http://localhost:8545')
RPCConnection.register_constructor(ConnType.HTTP, JSONRPCHTTPConnection)
tag = 'baz'
chain_spec = ChainSpec('foo', 'bar', 42, tag=tag)
RPCConnection.register_location(rpc_provider, chain_spec, tag='default')
conn = RPCConnection.connect(chain_spec, 'default')
# check the connection
if not conn.check():
sys.stderr.write('node {} not usable\n'.format(rpc_provider))
sys.exit(1)
# build and send rpc call
g = JSONRPCRequest()
o = g.template()
o['method'] = 'eth_blockNumber'
r = conn.do(o)
# interpret result for humans
try:
block_number = int(r, 10)
except ValueError:
block_number = int(r, 16)
print('block number {}'.format(block_number))