eth-gas-proxy

Middleware to selectively override EVM gas heuristics
git clone git://holbrook.no/eth-gas-proxy.git
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server.py (1902B)

      1 import re
      2 import os
      3 import argparse
      4 import logging
      5 import socket
      6 import json
      7 
      8 import websocket
      9 
     10 from gas_proxy.proxy import JSONRPCOracle as Oracle
     11 from gas_proxy.cache.mem import MemCache
     12 
     13 logging.basicConfig(level=logging.WARNING)
     14 logg = logging.getLogger()
     15 
     16 
     17 argparser = argparse.ArgumentParser()
     18 #argparser.add_argument('-c', type=str, default=config_dir, help='config file')
     19 argparser.add_argument('--env-prefix', default=os.environ.get('CONFINI_ENV_PREFIX'), dest='env_prefix', type=str, help='environment prefix for variables to overwrite configuration')
     20 argparser.add_argument('--host', default='localhost', type=str)
     21 argparser.add_argument('--port', default=8545, type=int)
     22 argparser.add_argument('-v', action='store_true', help='be verbose')
     23 argparser.add_argument('-vv', action='store_true', help='be more verbose')
     24 argparser.add_argument('provider', type=str, help='Gas price provider url')
     25 args = argparser.parse_args()
     26 
     27 if args.vv:
     28     logging.getLogger().setLevel(logging.DEBUG)
     29 elif args.v:
     30     logging.getLogger().setLevel(logging.INFO)
     31 
     32 re_websocket = r'^wss?://(.+):(\d+)/?$'
     33 m = re.match(re_websocket, args.provider)
     34 if m == None:
     35     raise ValueError('websocket providers only')
     36 
     37 logg.debug('using websocket host {} port {}'.format(m.group(1), m.group(2)))
     38 connection_string = args.provider
     39 
     40 
     41 def main():
     42     memcache = MemCache()
     43 
     44     ws = websocket.create_connection(connection_string)
     45     ws = Oracle(ws, cache=memcache)
     46 
     47     s = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
     48     s.bind((args.host, args.port))
     49     s.listen(10)
     50 
     51     while True:
     52         (csock, caddr) = s.accept()
     53         d = csock.recv(4096)
     54         o = json.loads(d)
     55         response = {
     56             "jsonrpc": "2.0",
     57             "id": o['id'],
     58             "result": ws.get(),
     59                 }
     60         csock.send(json.dumps(response).encode('utf-8'))
     61 
     62 
     63 if __name__ == '__main__':
     64     main()