2014-01-13 03:44:57 +00:00
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'''
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Blockchain API implementing Blockchain.info interface
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'''
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import binascii
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import urllib2
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import json
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2014-02-09 03:47:19 +00:00
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try:
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from filecache import filecache, MONTH
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except:
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def filecache(x):
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def _inner(y):
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return y
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return _inner
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MONTH = None
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2014-01-13 03:44:57 +00:00
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import types_pb2 as proto_types
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class BlockchainApi(object):
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def _raw_tx(self, txhash):
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# Download tx data from blockchain.info
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2014-02-06 09:43:03 +00:00
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url = 'http://blockchain.info/rawtx/%s?scripts=true' % txhash
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print "Downloading", url
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f = urllib2.urlopen(url)
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2014-01-13 03:44:57 +00:00
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return json.load(f)
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def submit(self, tx):
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raise Exception("Not implemented yet")
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2014-02-09 03:47:19 +00:00
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@filecache(MONTH)
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2014-01-13 03:44:57 +00:00
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def get_tx(self, txhash):
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# Build protobuf transaction structure from blockchain.info
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d = self._raw_tx(txhash)
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t = proto_types.TransactionType()
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for inp in d['inputs']:
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di = self._raw_tx(inp['prev_out']['tx_index'])
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i = t.inputs.add()
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i.prev_hash = binascii.unhexlify(di['hash'])
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i.prev_index = inp['prev_out']['n']
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i.script_sig = binascii.unhexlify(inp['script'])
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for output in d['out']:
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o = t.outputs.add()
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o.amount = output['value']
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o.script_pubkey = binascii.unhexlify(output['script'])
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return t
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if __name__ == '__main__':
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api = BlockchainApi()
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print api.get_tx('b9f382b8dfc34accc05491712a1ad8f7f075a02056dc4821d1f60702fb3fdb2f')
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