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Initial commit; receive all eth code from chainlib package

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__pycache__
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- 0.0.5-pending
* Receive all ethereum components from chainlib package

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The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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include *requirements.txt LICENSE

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# chainlib-eth
Ethereum implementation of the chainlib blockchain interface tooling
See https://gitlab.com/chaintool/chainlib for more information

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# third-party imports
import sha3
from hexathon import (
strip_0x,
uniform,
)
from crypto_dev_signer.encoding import (
is_address,
is_checksum_address,
to_checksum_address,
)
to_checksum = to_checksum_address

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# third-party imports
from chainlib.jsonrpc import JSONRPCRequest
from chainlib.eth.tx import Tx
from hexathon import (
add_0x,
strip_0x,
even,
)
def block_latest(id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_blockNumber'
return j.finalize(o)
def block_by_hash(hsh, include_tx=True, id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getBlockByHash'
o['params'].append(hsh)
o['params'].append(include_tx)
return j.finalize(o)
def block_by_number(n, include_tx=True, id_generator=None):
nhx = add_0x(even(hex(n)[2:]))
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getBlockByNumber'
o['params'].append(nhx)
o['params'].append(include_tx)
return j.finalize(o)
def transaction_count(block_hash, id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getBlockTransactionCountByHash'
o['params'].append(block_hash)
return j.finalize(o)
class Block:
def __init__(self, src):
self.hash = src['hash']
try:
self.number = int(strip_0x(src['number']), 16)
except TypeError:
self.number = int(src['number'])
self.txs = src['transactions']
self.block_src = src
try:
self.timestamp = int(strip_0x(src['timestamp']), 16)
except TypeError:
self.timestamp = int(src['timestamp'])
def src(self):
return self.block_src
def tx(self, i):
return Tx(self.txs[i], self)
def tx_src(self, i):
return self.txs[i]
def __str__(self):
return 'block {} {} ({} txs)'.format(self.number, self.hash, len(self.txs))
@staticmethod
def from_src(src):
return Block(src)

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from chainlib.jsonrpc import JSONRPCRequest
def network_id(id_generator=None):
j = JSONRPCRequest(id_generator=id_generator)
o = j.template()
o['method'] = 'net_version'
return j.finalize(o)

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# standard imports
import copy
import logging
import json
import datetime
import time
import socket
from urllib.request import (
Request,
urlopen,
)
# third-party imports
from hexathon import (
add_0x,
strip_0x,
)
# local imports
from .error import (
DefaultErrorParser,
RevertEthException,
)
from .sign import (
sign_transaction,
)
from chainlib.connection import (
ConnType,
RPCConnection,
JSONRPCHTTPConnection,
JSONRPCUnixConnection,
error_parser,
)
from chainlib.jsonrpc import (
JSONRPCRequest,
jsonrpc_result,
)
from chainlib.eth.tx import (
unpack,
)
logg = logging.getLogger(__name__)
class EthHTTPConnection(JSONRPCHTTPConnection):
def wait(self, tx_hash_hex, delay=0.5, timeout=0.0, error_parser=error_parser, id_generator=None):
t = datetime.datetime.utcnow()
i = 0
while True:
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] ='eth_getTransactionReceipt'
o['params'].append(add_0x(tx_hash_hex))
o = j.finalize(o)
req = Request(
self.location,
method='POST',
)
req.add_header('Content-Type', 'application/json')
data = json.dumps(o)
logg.debug('(HTTP) poll receipt attempt {} {}'.format(i, data))
res = urlopen(req, data=data.encode('utf-8'))
r = json.load(res)
e = jsonrpc_result(r, error_parser)
if e != None:
logg.debug('(HTTP) poll receipt completed {}'.format(r))
logg.debug('e {}'.format(strip_0x(e['status'])))
if strip_0x(e['status']) == '00':
raise RevertEthException(tx_hash_hex)
return e
if timeout > 0.0:
delta = (datetime.datetime.utcnow() - t) + datetime.timedelta(seconds=delay)
if delta.total_seconds() >= timeout:
raise TimeoutError(tx_hash)
time.sleep(delay)
i += 1
def check_rpc(self, id_generator=None):
j = JSONRPCRequest(id_generator)
req = j.template()
req['method'] = 'net_version'
req = j.finalize(req)
r = self.do(req)
class EthUnixConnection(JSONRPCUnixConnection):
def wait(self, tx_hash_hex, delay=0.5, timeout=0.0, error_parser=error_parser):
raise NotImplementedError('Not yet implemented for unix socket')
def sign_transaction_to_rlp(chain_spec, doer, tx):
txs = tx.serialize()
logg.debug('serializing {}'.format(txs))
# TODO: because some rpc servers may fail when chainId is included, we are forced to spend cpu here on this
chain_id = txs.get('chainId') or 1
if chain_spec != None:
chain_id = chain_spec.chain_id()
txs['chainId'] = add_0x(chain_id.to_bytes(2, 'big').hex())
txs['from'] = add_0x(tx.sender)
o = sign_transaction(txs)
r = doer(o)
logg.debug('sig got {}'.format(r))
return bytes.fromhex(strip_0x(r))
def sign_message(doer, msg):
o = sign_message(msg)
return doer(o)
class EthUnixSignerConnection(EthUnixConnection):
def sign_transaction_to_rlp(self, tx):
return sign_transaction_to_rlp(self.chain_spec, self.do, tx)
def sign_message(self, tx):
return sign_message(self.do, tx)
class EthHTTPSignerConnection(EthHTTPConnection):
def sign_transaction_to_rlp(self, tx):
return sign_transaction_to_rlp(self.chain_spec, self.do, tx)
def sign_message(self, tx):
return sign_message(self.do, tx)
RPCConnection.register_constructor(ConnType.HTTP, EthHTTPConnection, tag='eth_default')
RPCConnection.register_constructor(ConnType.HTTP_SSL, EthHTTPConnection, tag='eth_default')
RPCConnection.register_constructor(ConnType.UNIX, EthUnixConnection, tag='eth_default')

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ZERO_ADDRESS = '0x{:040x}'.format(0)
ZERO_CONTENT = '0x{:064x}'.format(0)
MINIMUM_FEE_UNITS = 21000
MINIMUM_FEE_PRICE = 1000000000
MAX_UINT = int('0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16)

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# standard imports
import enum
import re
import logging
# external imports
from hexathon import (
strip_0x,
pad,
)
# local imports
from chainlib.hash import keccak256_string_to_hex
from chainlib.block import BlockSpec
from chainlib.jsonrpc import JSONRPCRequest
from .address import to_checksum_address
#logg = logging.getLogger(__name__)
logg = logging.getLogger()
re_method = r'^[a-zA-Z0-9_]+$'
class ABIContractType(enum.Enum):
BYTES32 = 'bytes32'
BYTES4 = 'bytes4'
UINT256 = 'uint256'
ADDRESS = 'address'
STRING = 'string'
BOOLEAN = 'bool'
dynamic_contract_types = [
ABIContractType.STRING,
]
class ABIContract:
def __init__(self):
self.types = []
self.contents = []
class ABIMethodEncoder(ABIContract):
def __init__(self):
super(ABIMethodEncoder, self).__init__()
self.method_name = None
self.method_contents = []
def method(self, m):
if re.match(re_method, m) == None:
raise ValueError('Invalid method {}, must match regular expression {}'.format(re_method))
self.method_name = m
self.__log_method()
def get_method(self):
if self.method_name == None:
return ''
return '{}({})'.format(self.method_name, ','.join(self.method_contents))
def typ(self, v):
if self.method_name == None:
raise AttributeError('method name must be set before adding types')
if not isinstance(v, ABIContractType):
raise TypeError('method type not valid; expected {}, got {}'.format(type(ABIContractType).__name__, type(v).__name__))
self.method_contents.append(v.value)
self.__log_method()
def __log_method(self):
logg.debug('method set to {}'.format(self.get_method()))
class ABIContractDecoder:
def typ(self, v):
if not isinstance(v, ABIContractType):
raise TypeError('method type not valid; expected {}, got {}'.format(type(ABIContractType).__name__, type(v).__name__))
self.types.append(v.value)
self.__log_typ()
def val(self, v):
self.contents.append(v)
logg.debug('content is now {}'.format(self.contents))
def uint256(self, v):
return int(v, 16)
def bytes32(self, v):
return v
def bool(self, v):
return bool(self.uint256(v))
def boolean(self, v):
return bool(self.uint256(v))
def address(self, v):
a = strip_0x(v)[64-40:]
return to_checksum_address(a)
def string(self, v):
s = strip_0x(v)
b = bytes.fromhex(s)
cursor = 0
offset = int.from_bytes(b[cursor:cursor+32], 'big')
cursor += 32
length = int.from_bytes(b[cursor:cursor+32], 'big')
cursor += 32
content = b[cursor:cursor+length]
logg.debug('parsing string offset {} length {} content {}'.format(offset, length, content))
return content.decode('utf-8')
def __log_typ(self):
logg.debug('types set to ({})'.format(','.join(self.types)))
def decode(self):
r = []
logg.debug('contents {}'.format(self.contents))
for i in range(len(self.types)):
m = getattr(self, self.types[i])
s = self.contents[i]
logg.debug('{} {} {} {} {}'.format(i, m, self.types[i], self.contents[i], s))
r.append(m(s.hex()))
return r
def get(self):
return self.decode()
def __str__(self):
return self.decode()
class ABIContractLogDecoder(ABIMethodEncoder, ABIContractDecoder):
def __init__(self):
super(ABIContractLogDecoder, self).__init__()
self.method_name = None
self.indexed_content = []
def topic(self, event):
self.method(event)
def get_method_signature(self):
s = self.get_method()
return keccak256_string_to_hex(s)
def typ(self, v):
super(ABIContractLogDecoder, self).typ(v)
self.types.append(v.value)
def apply(self, topics, data):
t = self.get_method_signature()
if topics[0] != t:
raise ValueError('topic mismatch')
for i in range(len(topics) - 1):
self.contents.append(topics[i+1])
self.contents += data
class ABIContractEncoder(ABIMethodEncoder):
def __log_latest(self, v):
l = len(self.types) - 1
logg.debug('Encoder added {} -> {} ({})'.format(v, self.contents[l], self.types[l].value))
def uint256(self, v):
v = int(v)
b = v.to_bytes(32, 'big')
self.contents.append(b.hex())
self.types.append(ABIContractType.UINT256)
self.__log_latest(v)
def bool(self, v):
return self.boolean(v)
def boolean(self, v):
if bool(v):
return self.uint256(1)
return self.uint256(0)
def address(self, v):
self.bytes_fixed(32, v, 20)
self.types.append(ABIContractType.ADDRESS)
self.__log_latest(v)
def bytes32(self, v):
self.bytes_fixed(32, v)
self.types.append(ABIContractType.BYTES32)
self.__log_latest(v)
def bytes4(self, v):
self.bytes_fixed(4, v)
self.types.append(ABIContractType.BYTES4)
self.__log_latest(v)
def string(self, v):
b = v.encode('utf-8')
l = len(b)
contents = l.to_bytes(32, 'big')
contents += b
padlen = 32 - (l % 32)
contents += padlen * b'\x00'
self.bytes_fixed(len(contents), contents)
self.types.append(ABIContractType.STRING)
self.__log_latest(v)
return contents
def bytes_fixed(self, mx, v, exact=0):
typ = type(v).__name__
if typ == 'str':
v = strip_0x(v)
l = len(v)
if exact > 0 and l != exact * 2:
raise ValueError('value wrong size; expected {}, got {})'.format(mx, l))
if l > mx * 2:
raise ValueError('value too long ({})'.format(l))
v = pad(v, mx)
elif typ == 'bytes':
l = len(v)
if exact > 0 and l != exact:
raise ValueError('value wrong size; expected {}, got {})'.format(mx, l))
b = bytearray(mx)
b[mx-l:] = v
v = pad(b.hex(), mx)
else:
raise ValueError('invalid input {}'.format(typ))
self.contents.append(v.ljust(64, '0'))
def get_method_signature(self):
s = self.get_method()
if s == '':
return s
return keccak256_string_to_hex(s)[:8]
def get_contents(self):
direct_contents = ''
pointer_contents = ''
l = len(self.types)
pointer_cursor = 32 * l
for i in range(l):
if self.types[i] in dynamic_contract_types:
content_length = len(self.contents[i])
pointer_contents += self.contents[i]
direct_contents += pointer_cursor.to_bytes(32, 'big').hex()
pointer_cursor += int(content_length / 2)
else:
direct_contents += self.contents[i]
s = ''.join(direct_contents + pointer_contents)
for i in range(0, len(s), 64):
l = len(s) - i
if l > 64:
l = 64
logg.debug('code word {} {}'.format(int(i / 64), s[i:i+64]))
return s
def get(self):
return self.encode()
def encode(self):
m = self.get_method_signature()
c = self.get_contents()
return m + c
def __str__(self):
return self.encode()
def abi_decode_single(typ, v):
d = ABIContractDecoder()
d.typ(typ)
d.val(v)
r = d.decode()
return r[0]
def code(address, block_spec=BlockSpec.LATEST, id_generator=None):
block_height = None
if block_spec == BlockSpec.LATEST:
block_height = 'latest'
elif block_spec == BlockSpec.PENDING:
block_height = 'pending'
else:
block_height = int(block_spec)
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getCode'
o['params'].append(address)
o['params'].append(block_height)
return j.finalize(o)

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# local imports
from chainlib.error import ExecutionError
class EthException(Exception):
pass
class RevertEthException(EthException, ExecutionError):
pass
class NotFoundEthException(EthException):
pass
class RequestMismatchException(EthException):
pass
class DefaultErrorParser:
def translate(self, error):
return EthException('default parser code {}'.format(error))

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# standard imports
import logging
# third-party imports
from hexathon import (
add_0x,
strip_0x,
)
from crypto_dev_signer.eth.transaction import EIP155Transaction
# local imports
from chainlib.hash import keccak256_hex_to_hex
from chainlib.jsonrpc import JSONRPCRequest
from chainlib.eth.tx import (
TxFactory,
TxFormat,
raw,
)
from chainlib.eth.constant import (
MINIMUM_FEE_UNITS,
)
logg = logging.getLogger(__name__)
def price(id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_gasPrice'
return j.finalize(o)
def balance(address, id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getBalance'
o['params'].append(address)
o['params'].append('latest')
return j.finalize(o)
def parse_balance(balance):
try:
r = int(balance, 10)
except ValueError:
r = int(balance, 16)
return r
class Gas(TxFactory):
def create(self, sender_address, recipient_address, value, tx_format=TxFormat.JSONRPC, id_generator=None):
tx = self.template(sender_address, recipient_address, use_nonce=True)
tx['value'] = value
txe = EIP155Transaction(tx, tx['nonce'], tx['chainId'])
tx_raw = self.signer.sign_transaction_to_rlp(txe)
tx_raw_hex = add_0x(tx_raw.hex())
tx_hash_hex = add_0x(keccak256_hex_to_hex(tx_raw_hex))
o = None
if tx_format == TxFormat.JSONRPC:
o = raw(tx_raw_hex, id_generator=id_generator)
elif tx_format == TxFormat.RLP_SIGNED:
o = tx_raw_hex
return (tx_hash_hex, o)
class RPCGasOracle:
def __init__(self, conn, code_callback=None, min_price=1, id_generator=None):
self.conn = conn
self.code_callback = code_callback
self.min_price = min_price
self.id_generator = id_generator
def get_gas(self, code=None):
gas_price = 0
if self.conn != None:
o = price(id_generator=self.id_generator)
r = self.conn.do(o)
n = strip_0x(r)
gas_price = int(n, 16)
fee_units = MINIMUM_FEE_UNITS
if self.code_callback != None:
fee_units = self.code_callback(code)
if gas_price < self.min_price:
logg.debug('adjusting price {} to set minimum {}'.format(gas_price, self.min_price))
gas_price = self.min_price
return (gas_price, fee_units)
class RPCPureGasOracle(RPCGasOracle):
def __init__(self, conn, code_callback=None, id_generator=None):
super(RPCPureGasOracle, self).__init__(conn, code_callback=code_callback, min_price=0, id_generator=id_generator)
class OverrideGasOracle(RPCGasOracle):
def __init__(self, price=None, limit=None, conn=None, code_callback=None, id_generator=None):
self.conn = None
self.code_callback = None
self.limit = limit
self.price = price
price_conn = None
if self.limit == None or self.price == None:
if self.price == None:
price_conn = conn
logg.debug('override gas oracle with rpc fallback; price {} limit {}'.format(self.price, self.limit))
super(OverrideGasOracle, self).__init__(price_conn, code_callback, id_generator=id_generator)
def get_gas(self, code=None):
r = None
fee_units = None
fee_price = None
rpc_results = super(OverrideGasOracle, self).get_gas(code)
if self.limit != None:
fee_units = self.limit
if self.price != None:
fee_price = self.price
if fee_price == None:
if rpc_results != None:
fee_price = rpc_results[0]
logg.debug('override gas oracle without explicit price, setting from rpc {}'.format(fee_price))
else:
fee_price = MINIMUM_FEE_PRICE
logg.debug('override gas oracle without explicit price, setting default {}'.format(fee_price))
if fee_units == None:
if rpc_results != None:
fee_units = rpc_results[1]
logg.debug('override gas oracle without explicit limit, setting from rpc {}'.format(fee_units))
else:
fee_units = MINIMUM_FEE_UNITS
logg.debug('override gas oracle without explicit limit, setting default {}'.format(fee_units))
return (fee_price, fee_units)
DefaultGasOracle = RPCGasOracle

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# proposed custom errors
# source: https://eth.wiki/json-rpc/json-rpc-error-codes-improvement-proposal
#1 Unauthorized Should be used when some action is not authorized, e.g. sending from a locked account.
#2 Action not allowed Should be used when some action is not allowed, e.g. preventing an action, while another depending action is processing on, like sending again when a confirmation popup is shown to the user (?).
#3 Execution error Will contain a subset of custom errors in the data field. See below.
#100 X doesn’t exist Should be used when something which should be there is not found. (Doesn’t apply to eth_getTransactionBy_ and eth_getBlock_. They return a success with value null)
#101 Requires ether Should be used for actions which require somethin else, e.g. gas or a value.
#102 Gas too low Should be used when a to low value of gas was given.
#103 Gas limit exceeded Should be used when a limit is exceeded, e.g. for the gas limit in a block.
#104 Rejected Should be used when an action was rejected, e.g. because of its content (too long contract code, containing wrong characters ?, should differ from -32602 - Invalid params).
#105 Ether too low Should be used when a to low value of Ether was given.
#106 Timeout Should be used when an action timedout.
#107 Conflict Should be used when an action conflicts with another (ongoing?) action.

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# external imports
import sha3
class LogBloom:
def __init__(self):
self.content = bytearray(256)
def add(self, element):
if not isinstance(element, bytes):
raise ValueError('element must be bytes')
h = sha3.keccak_256()
h.update(element)
z = h.digest()
for j in range(3):
c = j * 2
v = int.from_bytes(z[c:c+2], byteorder='big')
v &= 0x07ff
m = 255 - int(v / 8)
n = v % 8
self.content[m] |= (1 << n)

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# third-party imports
from hexathon import (
add_0x,
strip_0x,
)
# local imports
from chainlib.jsonrpc import JSONRPCRequest
def nonce(address, id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_getTransactionCount'
o['params'].append(address)
o['params'].append('pending')
return j.finalize(o)
class NonceOracle:
def __init__(self, address, id_generator=None):
self.address = address
self.id_generator = id_generator
self.nonce = self.get_nonce()
def get_nonce(self):
raise NotImplementedError('Class must be extended')
def next_nonce(self):
n = self.nonce
self.nonce += 1
return n
class RPCNonceOracle(NonceOracle):
def __init__(self, address, conn, id_generator=None):
self.conn = conn
super(RPCNonceOracle, self).__init__(address, id_generator=id_generator)
def get_nonce(self):
o = nonce(self.address, id_generator=self.id_generator)
r = self.conn.do(o)
n = strip_0x(r)
return int(n, 16)
class OverrideNonceOracle(NonceOracle):
def __init__(self, address, nonce):
self.nonce = nonce
super(OverrideNonceOracle, self).__init__(address)
def get_nonce(self):
return self.nonce
DefaultNonceOracle = RPCNonceOracle

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chainlib/eth/pytest/__init__.py Normal file
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