Editar: resuelto, desplácese hacia abajo.

¿Cómo decodificar los resultados del filtro?

Un contrato está emitiendo este Evento

event Send(address from, address to, uint value)

Con ethjsonrpcy eth_getFilterChangesestoy recibiendo este filterlog:

filterChanges=[{u'address': u'0x3673d5b436089c9aa3f59df5062c7431c86c21d7',
  u'blockHash': u'0x4bf30aba20336f634cfb638dab2bc72b06f79ae21072466102d3bde1247a016c',
  u'blockNumber': u'0xb5bed',
  u'data': u'0x000000000000000000000000157fb756013257b2705833f12d9897de8600b91f00000000000000000000000043bc6919fd3c40dce81fb4b00bd7e33db68b7be10000000000000000000000000000000000000000000000000000000000000002',
  u'logIndex': u'0x0',
  u'topics': [u'0x93eb3c629eb575edaf0252e4f9fc0c5ccada50496f8c1d32f0f93a65a8257eb5'],
  u'transactionHash': u'0x76b0bf4e5cdaee03725c97710ee3d3f218971664231c7e3259935d3d1b210443',
  u'transactionIndex': u'0x0'}]

Ahora estoy tratando de descifrar ese 'data'elemento que es claramente (dirección, dirección, cantidad).

Pero, ¿cómo transformarlo con las bibliotecas de Python?

data = filterChanges[0]["data"]
print data
print len(data)

import ethereum.abi
data_dec = ethereum.abi.decode_abi(["address", "address", "uint256"], data)
pprint (data_dec)

da como resultado

0x000000000000000000000000157fb756013257b2705833f12d9897de8600b91f00000000000000000000000043bc6919fd3c40dce81fb4b00bd7e33db68b7be10000000000000000000000000000000000000000000000000000000000000002
194
['3030303030303030303030303030313537666237',
 '3538333366313264393839376465383630306239',
  22343880564164347692490066462159793276992634768622606872680301975360839562809L]

¿Alguna pista? Gracias.

Editar: Resuelto

la función decode_abi espera datos binarios

filterChanges=[{u'address': u'0x3673d5b436089c9aa3f59df5062c7431c86c21d7',
  u'blockHash': u'0xabbaaefe73c34ddfce9c3656ede6a754d105f1a2b43fbcf28baad633703d095c',
  u'blockNumber': u'0xb914d',
  u'data': u'0x00000000000000000000000043bc6919fd3c40dce81fb4b00bd7e33db68b7be1000000000000000000000000157fb756013257b2705833f12d9897de8600b91f000000000000000000000000000000000000000000000000000000000000002a',
  u'logIndex': u'0x0',
  u'topics': [u'0x93eb3c629eb575edaf0252e4f9fc0c5ccada50496f8c1d32f0f93a65a8257eb5'],
  u'transactionHash': u'0x89247c65380bf66a194a72b01a750356ee4cb8e3ce336dbaaba89b527c21de47',
  u'transactionIndex': u'0x0'}]

logdata_hex = filterChanges[0]["data"]
print; print logdata_hex; print len(logdata_hex)

logdata_hex_wo_0x =  logdata_hex[2:]
print; print logdata_hex_wo_0x; print len(logdata_hex_wo_0x)

logdata = logdata_hex_wo_0x.decode('hex')
print; print logdata; print len(logdata)

import ethereum.abi
data_dec = ethereum.abi.decode_abi(["address", "address", "uint256"], logdata)
print; pprint (data_dec)

resultados en:

0x00000000000000000000000043bc6919fd3c40dce81fb4b00bd7e33db68b7be1000000000000000000000000157fb756013257b2705833f12d9897de8600b91f000000000000000000000000000000000000000000000000000000000000002a
194

00000000000000000000000043bc6919fd3c40dce81fb4b00bd7e33db68b7be1000000000000000000000000157fb756013257b2705833f12d9897de8600b91f000000000000000000000000000000000000000000000000000000000000002a
192

C�i�<@������=��{��V2W�pX3�-��ކ�*
96

['43bc6919fd3c40dce81fb4b00bd7e33db68b7be1',
 '157fb756013257b2705833f12d9897de8600b91f',
 42]

Gracias a @hack.augusto

etiquetas: Python, registros de contratos, pyethereum, ethjsonrpc, decodificar