mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-22 07:28:10 +00:00
62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
# This file is part of the Trezor project.
|
|
#
|
|
# Copyright (C) 2012-2019 SatoshiLabs and contributors
|
|
#
|
|
# This library is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License version 3
|
|
# as published by the Free Software Foundation.
|
|
#
|
|
# This library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the License along with this library.
|
|
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
|
|
|
|
import decimal
|
|
import json
|
|
import os.path
|
|
|
|
from trezorlib import coins
|
|
from trezorlib.tx_api import json_to_tx
|
|
|
|
CACHE_PATH = os.path.join(os.path.dirname(__file__), "txcache")
|
|
|
|
|
|
def tx_cache(coin_name, allow_fetch=True):
|
|
coin_data = coins.by_name[coin_name]
|
|
fetch = coins.tx_api[coin_name].get_tx_data if allow_fetch else None
|
|
return TxCache(CACHE_PATH, coin_data, fetch)
|
|
|
|
|
|
class TxCache:
|
|
def __init__(self, path, coin_data, fetch=None):
|
|
self.path = path
|
|
self.coin_data = coin_data
|
|
self.fetch = fetch
|
|
|
|
coin_slug = coin_data["coin_name"].lower().replace(" ", "_")
|
|
prefix = "insight_" + coin_slug + "_tx_"
|
|
self.file_pattern = os.path.join(self.path, prefix + "{}.json")
|
|
|
|
def get_tx(self, txhash):
|
|
cache_file = self.file_pattern.format(txhash)
|
|
|
|
try:
|
|
with open(cache_file) as f:
|
|
data = json.load(f, parse_float=decimal.Decimal)
|
|
return json_to_tx(self.coin_data, data)
|
|
except Exception as e:
|
|
if self.fetch is None:
|
|
raise Exception("Unhandled cache miss") from e
|
|
|
|
# cache miss, try to use backend
|
|
data = self.fetch(txhash)
|
|
with open(cache_file, "w") as f:
|
|
json.dump(data, f)
|
|
return json_to_tx(self.coin_data, data)
|
|
|
|
def __getitem__(self, key):
|
|
return self.get_tx(key.hex())
|