chainlib-eth

Ethereum implementation of the chainlib interface
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jsonrpc.py (713B)

      1 # standard imports
      2 import os
      3 import sys
      4 
      5 # local imports
      6 from chainlib.jsonrpc import JSONRPCRequest
      7 from chainlib.eth.connection import EthHTTPConnection
      8 
      9 # set up node connection and execute rpc call
     10 rpc_provider = os.environ.get('RPC_PROVIDER', 'http://localhost:8545')
     11 conn = EthHTTPConnection(rpc_provider)
     12 
     13 # check the connection
     14 if not conn.check():
     15     sys.stderr.write('node {} not usable\n'.format(rpc_provider))
     16     sys.exit(1)
     17 
     18 # build and send rpc call
     19 g = JSONRPCRequest()
     20 o = g.template()
     21 o['method'] = 'eth_blockNumber'
     22 r = conn.do(o)
     23 
     24 # interpret result for humans
     25 try:
     26     block_number = int(r, 10)
     27 except ValueError:
     28     block_number = int(r, 16)
     29 
     30 print('block number {}'.format(block_number))