mirror of
https://github.com/trezor/trezor-firmware.git
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62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2019 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 decimal
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import json
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import os.path
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from trezorlib import coins
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from trezorlib.tx_api import json_to_tx
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CACHE_PATH = os.path.join(os.path.dirname(__file__), "..", "txcache")
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def tx_cache(coin_name, allow_fetch=True):
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coin_data = coins.by_name[coin_name]
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fetch = coins.tx_api[coin_name].get_tx_data if allow_fetch else None
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return TxCache(CACHE_PATH, coin_data, fetch)
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class TxCache:
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def __init__(self, path, coin_data, fetch=None):
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self.path = path
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self.coin_data = coin_data
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self.fetch = fetch
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coin_slug = coin_data["coin_name"].lower().replace(" ", "_")
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prefix = "insight_" + coin_slug + "_tx_"
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self.file_pattern = os.path.join(self.path, prefix + "{}.json")
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def get_tx(self, txhash):
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cache_file = self.file_pattern.format(txhash)
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try:
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with open(cache_file) as f:
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data = json.load(f, parse_float=decimal.Decimal)
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return json_to_tx(self.coin_data, data)
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except Exception as e:
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if self.fetch is None:
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raise Exception("Unhandled cache miss") from e
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# cache miss, try to use backend
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data = self.fetch(txhash)
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with open(cache_file, "w") as f:
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json.dump(data, f)
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return json_to_tx(self.coin_data, data)
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def __getitem__(self, key):
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return self.get_tx(key.hex())
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