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https://github.com/trezor/trezor-firmware.git
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19a0f4cc7b
Bitcoin Testnet backends were removed. This broke our tests that work purely on local data but nevertheless need to know backend URLs. Because the design is less than ideal. Here, we do a little cleanup: * blockbook URLs are respected * Dogecoin is now supported by our blockbook backend so we don't need a special tx-api implementation * it's possible to instantiate a TxApi that is backed by the cache, without a known URL * relevant tests now make use of this feature
118 lines
3.9 KiB
Python
118 lines
3.9 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import binascii
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from decimal import Decimal
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import requests
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import json
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from . import messages as proto
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cache_dir = None
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class TxApi(object):
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def __init__(self, network, url=None):
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self.network = network
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self.url = url
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def get_url(self, resource, resourceid):
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url = '%s%s/%s' % (self.url, resource, resourceid)
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return url
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def fetch_json(self, resource, resourceid):
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global cache_dir
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if cache_dir:
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cache_file = '%s/%s_%s_%s.json' % (cache_dir, self.network, resource, resourceid)
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try: # looking into cache first
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j = json.load(open(cache_file), parse_float=str)
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return j
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except:
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pass
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if not self.url:
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raise RuntimeError("No URL specified and tx not in cache")
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try:
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url = self.get_url(resource, resourceid)
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r = requests.get(url, headers={'User-agent': 'Mozilla/5.0'})
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j = r.json(parse_float=str)
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except:
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raise RuntimeError('URL error: %s' % url)
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if cache_dir and cache_file:
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try: # saving into cache
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json.dump(j, open(cache_file, 'w'))
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except:
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pass
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return j
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def get_tx(self, txhash):
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raise NotImplementedError
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class TxApiInsight(TxApi):
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def __init__(self, network, url=None, zcash=None):
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super().__init__(network, url)
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self.zcash = zcash
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if url:
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self.pushtx_url = url.replace('/api/', '/tx/send')
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def get_tx(self, txhash):
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data = self.fetch_json('tx', txhash)
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t = proto.TransactionType()
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t.version = data['version']
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t.lock_time = data['locktime']
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for vin in data['vin']:
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i = t._add_inputs()
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if 'coinbase' in vin.keys():
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i.prev_hash = b"\0" * 32
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i.prev_index = 0xffffffff # signed int -1
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i.script_sig = binascii.unhexlify(vin['coinbase'])
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i.sequence = vin['sequence']
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else:
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i.prev_hash = binascii.unhexlify(vin['txid'])
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i.prev_index = vin['vout']
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i.script_sig = binascii.unhexlify(vin['scriptSig']['hex'])
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i.sequence = vin['sequence']
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for vout in data['vout']:
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o = t._add_bin_outputs()
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o.amount = int(Decimal(vout['value']) * 100000000)
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o.script_pubkey = binascii.unhexlify(vout['scriptPubKey']['hex'])
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if self.zcash:
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t.overwintered = data.get('fOverwintered', False)
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t.expiry = data.get('nExpiryHeight', False)
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if t.version >= 2:
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joinsplit_cnt = len(data['vjoinsplit'])
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if joinsplit_cnt == 0:
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t.extra_data = b'\x00'
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else:
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if joinsplit_cnt >= 253:
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# we assume cnt < 253, so we can treat varIntLen(cnt) as 1
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raise ValueError('Too many joinsplits')
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extra_data_len = 1 + joinsplit_cnt * 1802 + 32 + 64
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raw = self.fetch_json('rawtx', txhash)
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raw = binascii.unhexlify(raw['rawtx'])
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t.extra_data = raw[-extra_data_len:]
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return t
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