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###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Crossbar.io Technologies GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
import struct
from binascii import a2b_hex, b2a_hex
from typing import Union, Dict, List
import web3
def make_w3(gateway_config=None):
"""
Create a Web3 instance configured and ready-to-use gateway to the blockchain.
:param gateway_config: Blockchain gateway configuration.
:type gateway_config: dict
:return: Configured Web3 instance.
:rtype: :class:`web3.Web3`
"""
if gateway_config is None or gateway_config['type'] == 'auto':
w3 = web3.Web3()
elif gateway_config['type'] == 'user':
request_kwargs = gateway_config.get('http_options', {})
w3 = web3.Web3(web3.Web3.HTTPProvider(gateway_config['http'], request_kwargs=request_kwargs))
elif gateway_config['type'] == 'infura':
request_kwargs = gateway_config.get('http_options', {})
project_id = gateway_config['key']
# project_secret = gateway_config['secret']
http_url = 'https://{}.infura.io/v3/{}'.format(gateway_config['network'], project_id)
w3 = web3.Web3(web3.Web3.HTTPProvider(http_url, request_kwargs=request_kwargs))
# https://web3py.readthedocs.io/en/stable/middleware.html#geth-style-proof-of-authority
if gateway_config.get('network', None) == 'rinkeby':
# This middleware is required to connect to geth --dev or the Rinkeby public network.
from web3.middleware import geth_poa_middleware
# inject the poa compatibility middleware to the innermost layer
w3.middleware_onion.inject(geth_poa_middleware, layer=0)
# FIXME
elif gateway_config['type'] == 'cloudflare':
# https://developers.cloudflare.com/web3/ethereum-gateway/reference/supported-networks/
raise NotImplementedError()
# FIXME
elif gateway_config['type'] == 'zksync':
# https://v2-docs.zksync.io/dev/testnet/important-links.html
raise NotImplementedError()
else:
raise RuntimeError('invalid blockchain gateway type "{}"'.format(gateway_config['type']))
return w3
def unpack_uint128(data):
assert data is None or type(data) == bytes, 'data must by bytes, was {}'.format(type(data))
if data and type(data) == bytes:
assert len(data) == 16, 'data must be bytes[16], but was bytes[{}]'.format(len(data))
if data:
return web3.Web3.toInt(data)
else:
return 0
def pack_uint128(value):
assert value is None or (type(value) == int and value >= 0 and value < 2**128)
if value:
data = web3.Web3.toBytes(value)
return b'\x00' * (16 - len(data)) + data
else:
return b'\x00' * 16
def unpack_uint256(data):
assert data is None or type(data) == bytes, 'data must by bytes, was {}'.format(type(data))
if data and type(data) == bytes:
assert len(data) == 32, 'data must be bytes[32], but was bytes[{}]'.format(len(data))
if data:
return int(web3.Web3.toInt(data))
else:
return 0
def pack_uint256(value):
assert value is None or (type(value) == int and value >= 0 and value < 2**256), 'value must be uint256, but was {}'.format(value)
if value:
data = web3.Web3.toBytes(value)
return b'\x00' * (32 - len(data)) + data
else:
return b'\x00' * 32
def pack_ethadr(value: Union[bytes, str], return_dict: bool = False) -> Union[List[int], Dict[str, int]]:
"""
:param value:
:param return_dict:
:return:
"""
if type(value) == str:
if value.startswith('0x'):
value_bytes = a2b_hex(value[2:])
else:
value_bytes = a2b_hex(value)
elif type(value) == bytes:
value_bytes = value
else:
assert False, 'invalid type {} for value'.format(type(value))
assert len(value_bytes) == 20
w = []
for i in range(5):
w.append(struct.unpack('<I', value_bytes[0 + i * 4:4 + i * 4])[0])
if return_dict:
packed_value = {'w0': w[0], 'w1': w[1], 'w2': w[2], 'w3': w[3], 'w4': w[4]}
else:
packed_value = w
return packed_value
def unpack_ethadr(packed_value: Union[List[int], Dict[str, int]], return_str=False) -> Union[bytes, str]:
"""
:param packed_value:
:param return_str:
:return:
"""
w = []
if type(packed_value) == dict:
for i in range(5):
w.append(struct.pack('<I', packed_value['w{}'.format(i)]))
elif type(packed_value) == list:
for i in range(5):
w.append(struct.pack('<I', packed_value[i]))
else:
assert False, 'should not arrive here'
if return_str:
return web3.Web3.toChecksumAddress('0x' + b2a_hex(b''.join(w)).decode())
else:
return b''.join(w)
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