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Merge #13047: [trivial] Tidy blocktools.py

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4d355bfb2b [tests] tidy up blocktools.py (John Newbery)
cab8be5adf [tests] Fix flake8 warnings in blocktools.py (John Newbery)
b184127db2 [doc][trivial] no retargeting in regtest mode (Jesse Cohen)

Pull request description:

  Tidies up the blocktools.py module:

  - fixes flake8 warnings
  - changes function-level comments to docstrings.

  Takes in @skeees's commit b184127db2

Tree-SHA512: 0f4c59ac8ccc9057492ec1996381e73380d65e85240f2ba9607174c0743d3a1853c4ed35a9e1bc704b2b6d6d823ac77aa7e81bd150cf5033de79293c24b791b0
This commit is contained in:
MarcoFalke 2018-04-21 08:49:47 -04:00
commit f644ea487a
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1 changed files with 67 additions and 45 deletions
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112
test/functional/test_framework/blocktools.py
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@ -10,7 +10,24 @@ from .address import (
script_to_p2sh_p2wsh,
script_to_p2wsh,
)
from .mininode import *
from .messages import (
CBlock,
COIN,
COutPoint,
CTransaction,
CTxIn,
CTxInWitness,
CTxOut,
FromHex,
ToHex,
bytes_to_hex_str,
hash256,
hex_str_to_bytes,
ser_string,
ser_uint256,
sha256,
uint256_from_str,
)
from .script import (
CScript,
OP_0,
@ -23,34 +40,34 @@ from .script import (
)
from .util import assert_equal
# Create a block (with regtest difficulty)
def create_block(hashprev, coinbase, nTime=None):
# From BIP141
WITNESS_COMMITMENT_HEADER = b"\xaa\x21\xa9\xed"
def create_block(hashprev, coinbase, ntime=None):
"""Create a block (with regtest difficulty)."""
block = CBlock()
if nTime is None:
if ntime is None:
import time
block.nTime = int(time.time()+600)
block.nTime = int(time.time() + 600)
else:
block.nTime = nTime
block.nTime = ntime
block.hashPrevBlock = hashprev
block.nBits = 0x207fffff # Will break after a difficulty adjustment...
block.nBits = 0x207fffff # difficulty retargeting is disabled in REGTEST chainparams
block.vtx.append(coinbase)
block.hashMerkleRoot = block.calc_merkle_root()
block.calc_sha256()
return block
# From BIP141
WITNESS_COMMITMENT_HEADER = b"\xaa\x21\xa9\xed"
def get_witness_script(witness_root, witness_nonce):
witness_commitment = uint256_from_str(hash256(ser_uint256(witness_root)+ser_uint256(witness_nonce)))
witness_commitment = uint256_from_str(hash256(ser_uint256(witness_root) + ser_uint256(witness_nonce)))
output_data = WITNESS_COMMITMENT_HEADER + ser_uint256(witness_commitment)
return CScript([OP_RETURN, output_data])
# According to BIP141, blocks with witness rules active must commit to the
# hash of all in-block transactions including witness.
def add_witness_commitment(block, nonce=0):
"""Add a witness commitment to the block's coinbase transaction.
According to BIP141, blocks with witness rules active must commit to the
hash of all in-block transactions including witness."""
# First calculate the merkle root of the block's
# transactions, with witnesses.
witness_nonce = nonce
@ -65,7 +82,6 @@ def add_witness_commitment(block, nonce=0):
block.hashMerkleRoot = block.calc_merkle_root()
block.rehash()
def serialize_script_num(value):
r = bytearray(0)
if value == 0:
@ -81,55 +97,59 @@ def serialize_script_num(value):
r[-1] |= 0x80
return r
# Create a coinbase transaction, assuming no miner fees.
# If pubkey is passed in, the coinbase output will be a P2PK output;
# otherwise an anyone-can-spend output.
def create_coinbase(height, pubkey = None):
def create_coinbase(height, pubkey=None):
"""Create a coinbase transaction, assuming no miner fees.
If pubkey is passed in, the coinbase output will be a P2PK output;
otherwise an anyone-can-spend output."""
coinbase = CTransaction()
coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff),
ser_string(serialize_script_num(height)), 0xffffffff))
coinbase.vin.append(CTxIn(COutPoint(0, 0xffffffff),
ser_string(serialize_script_num(height)), 0xffffffff))
coinbaseoutput = CTxOut()
coinbaseoutput.nValue = 50 * COIN
halvings = int(height/150) # regtest
halvings = int(height / 150) # regtest
coinbaseoutput.nValue >>= halvings
if (pubkey != None):
if (pubkey is not None):
coinbaseoutput.scriptPubKey = CScript([pubkey, OP_CHECKSIG])
else:
coinbaseoutput.scriptPubKey = CScript([OP_TRUE])
coinbase.vout = [ coinbaseoutput ]
coinbase.vout = [coinbaseoutput]
coinbase.calc_sha256()
return coinbase
# Create a transaction.
# If the scriptPubKey is not specified, make it anyone-can-spend.
def create_transaction(prevtx, n, sig, value, scriptPubKey=CScript()):
def create_transaction(prevtx, n, sig, value, script_pub_key=CScript()):
"""Create a transaction.
If the script_pub_key is not specified, make it anyone-can-spend."""
tx = CTransaction()
assert(n < len(prevtx.vout))
tx.vin.append(CTxIn(COutPoint(prevtx.sha256, n), sig, 0xffffffff))
tx.vout.append(CTxOut(value, scriptPubKey))
tx.vout.append(CTxOut(value, script_pub_key))
tx.calc_sha256()
return tx
def get_legacy_sigopcount_block(block, fAccurate=True):
def get_legacy_sigopcount_block(block, accurate=True):
count = 0
for tx in block.vtx:
count += get_legacy_sigopcount_tx(tx, fAccurate)
count += get_legacy_sigopcount_tx(tx, accurate)
return count
def get_legacy_sigopcount_tx(tx, fAccurate=True):
def get_legacy_sigopcount_tx(tx, accurate=True):
count = 0
for i in tx.vout:
count += i.scriptPubKey.GetSigOpCount(fAccurate)
count += i.scriptPubKey.GetSigOpCount(accurate)
for j in tx.vin:
# scriptSig might be of type bytes, so convert to CScript for the moment
count += CScript(j.scriptSig).GetSigOpCount(fAccurate)
count += CScript(j.scriptSig).GetSigOpCount(accurate)
return count
# Create a scriptPubKey corresponding to either a P2WPKH output for the
# given pubkey, or a P2WSH output of a 1-of-1 multisig for the given
# pubkey. Returns the hex encoding of the scriptPubKey.
def witness_script(use_p2wsh, pubkey):
if (use_p2wsh == False):
"""Create a scriptPubKey for a pay-to-wtiness TxOut.
This is either a P2WPKH output for the given pubkey, or a P2WSH output of a
1-of-1 multisig for the given pubkey. Returns the hex encoding of the
scriptPubKey."""
if not use_p2wsh:
# P2WPKH instead
pubkeyhash = hash160(hex_str_to_bytes(pubkey))
pkscript = CScript([OP_0, pubkeyhash])
@ -140,9 +160,10 @@ def witness_script(use_p2wsh, pubkey):
pkscript = CScript([OP_0, scripthash])
return bytes_to_hex_str(pkscript)
# Return a transaction (in hex) that spends the given utxo to a segwit output,
# optionally wrapping the segwit output using P2SH.
def create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount):
"""Return a transaction (in hex) that spends the given utxo to a segwit output.
Optionally wrap the segwit output using P2SH."""
if use_p2wsh:
program = CScript([OP_1, hex_str_to_bytes(pubkey), OP_1, OP_CHECKMULTISIG])
addr = script_to_p2sh_p2wsh(program) if encode_p2sh else script_to_p2wsh(program)
@ -152,12 +173,13 @@ def create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount):
assert_equal(node.getaddressinfo(addr)['scriptPubKey'], witness_script(use_p2wsh, pubkey))
return node.createrawtransaction([utxo], {addr: amount})
# Create a transaction spending a given utxo to a segwit output corresponding
# to the given pubkey: use_p2wsh determines whether to use P2WPKH or P2WSH;
# encode_p2sh determines whether to wrap in P2SH.
# sign=True will have the given node sign the transaction.
# insert_redeem_script will be added to the scriptSig, if given.
def send_to_witness(use_p2wsh, node, utxo, pubkey, encode_p2sh, amount, sign=True, insert_redeem_script=""):
"""Create a transaction spending a given utxo to a segwit output.
The output corresponds to the given pubkey: use_p2wsh determines whether to
use P2WPKH or P2WSH; encode_p2sh determines whether to wrap in P2SH.
sign=True will have the given node sign the transaction.
insert_redeem_script will be added to the scriptSig, if given."""
tx_to_witness = create_witness_tx(node, use_p2wsh, utxo, pubkey, encode_p2sh, amount)
if (sign):
signed = node.signrawtransactionwithwallet(tx_to_witness)