forked from LBRYCommunity/lbry-sdk
156 lines
5.2 KiB
Python
156 lines
5.2 KiB
Python
import struct
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from six import int2byte
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from binascii import unhexlify
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from torba.baseledger import BaseLedger
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from torba.baseheader import BaseHeaders, _ArithUint256
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from torba.util import int_to_hex, rev_hex, hash_encode
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from .network import Network
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from .database import WalletDatabase
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from .transaction import Transaction
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class Headers(BaseHeaders):
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header_size = 112
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@staticmethod
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def _serialize(header):
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return b''.join([
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int_to_hex(header['version'], 4),
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rev_hex(header['prev_block_hash']),
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rev_hex(header['merkle_root']),
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rev_hex(header['claim_trie_root']),
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int_to_hex(int(header['timestamp']), 4),
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int_to_hex(int(header['bits']), 4),
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int_to_hex(int(header['nonce']), 4)
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])
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@staticmethod
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def _deserialize(height, header):
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version, = struct.unpack('<I', header[:4])
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timestamp, bits, nonce = struct.unpack('<III', header[100:112])
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return {
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'version': version,
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'prev_block_hash': hash_encode(header[4:36]),
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'merkle_root': hash_encode(header[36:68]),
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'claim_trie_root': hash_encode(header[68:100]),
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'timestamp': timestamp,
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'bits': bits,
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'nonce': nonce,
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'block_height': height,
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}
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def _calculate_next_work_required(self, height, first, last):
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""" See: lbrycrd/src/lbry.cpp """
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if height == 0:
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return self.ledger.genesis_bits, self.ledger.max_target
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if self.verify_bits_to_target:
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bits = last['bits']
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bitsN = (bits >> 24) & 0xff
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assert 0x03 <= bitsN <= 0x1f, \
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"First part of bits should be in [0x03, 0x1d], but it was {}".format(hex(bitsN))
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bitsBase = bits & 0xffffff
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assert 0x8000 <= bitsBase <= 0x7fffff, \
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"Second part of bits should be in [0x8000, 0x7fffff] but it was {}".format(bitsBase)
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# new target
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retargetTimespan = self.ledger.target_timespan
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nActualTimespan = last['timestamp'] - first['timestamp']
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nModulatedTimespan = retargetTimespan + (nActualTimespan - retargetTimespan) // 8
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nMinTimespan = retargetTimespan - (retargetTimespan // 8)
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nMaxTimespan = retargetTimespan + (retargetTimespan // 2)
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# Limit adjustment step
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if nModulatedTimespan < nMinTimespan:
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nModulatedTimespan = nMinTimespan
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elif nModulatedTimespan > nMaxTimespan:
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nModulatedTimespan = nMaxTimespan
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# Retarget
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bnPowLimit = _ArithUint256(self.ledger.max_target)
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bnNew = _ArithUint256.SetCompact(last['bits'])
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bnNew *= nModulatedTimespan
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bnNew //= nModulatedTimespan
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if bnNew > bnPowLimit:
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bnNew = bnPowLimit
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return bnNew.GetCompact(), bnNew._value
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class MainNetLedger(BaseLedger):
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name = 'LBRY Credits'
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symbol = 'LBC'
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network_name = 'mainnet'
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database_class = WalletDatabase
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headers_class = Headers
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network_class = Network
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transaction_class = Transaction
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secret_prefix = int2byte(0x1c)
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pubkey_address_prefix = int2byte(0x55)
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script_address_prefix = int2byte(0x7a)
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extended_public_key_prefix = unhexlify('019c354f')
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extended_private_key_prefix = unhexlify('019c3118')
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max_target = 0x0000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
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genesis_hash = '9c89283ba0f3227f6c03b70216b9f665f0118d5e0fa729cedf4fb34d6a34f463'
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genesis_bits = 0x1f00ffff
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target_timespan = 150
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default_fee_per_byte = 50
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default_fee_per_name_char = 200000
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def __init__(self, *args, **kwargs):
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super(MainNetLedger, self).__init__(*args, **kwargs)
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self.fee_per_name_char = self.config.get('fee_per_name_char', self.default_fee_per_name_char)
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def get_transaction_base_fee(self, tx):
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""" Fee for the transaction header and all outputs; without inputs. """
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return max(
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super(MainNetLedger, self).get_transaction_base_fee(tx),
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self.get_transaction_claim_name_fee(tx)
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)
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def get_transaction_claim_name_fee(self, tx):
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fee = 0
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for output in tx.outputs:
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if output.script.is_claim_name:
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fee += len(output.script.values['claim_name']) * self.fee_per_name_char
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return fee
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def resolve(self, *uris):
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return self.network.get_values_for_uris(*uris)
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class TestNetLedger(MainNetLedger):
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network_name = 'testnet'
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pubkey_address_prefix = int2byte(111)
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script_address_prefix = int2byte(196)
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extended_public_key_prefix = unhexlify('043587cf')
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extended_private_key_prefix = unhexlify('04358394')
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class UnverifiedHeaders(Headers):
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verify_bits_to_target = False
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class RegTestLedger(MainNetLedger):
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network_name = 'regtest'
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headers_class = UnverifiedHeaders
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pubkey_address_prefix = int2byte(111)
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script_address_prefix = int2byte(196)
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extended_public_key_prefix = unhexlify('043587cf')
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extended_private_key_prefix = unhexlify('04358394')
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max_target = 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
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genesis_hash = '6e3fcf1299d4ec5d79c3a4c91d624a4acf9e2e173d95a1a0504f677669687556'
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genesis_bits = 0x207fffff
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target_timespan = 1
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