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[tests] tidy up blocktools.py

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Moves function comments to docstrings, and moves the module-level
constant to the top of the file.
This commit is contained in:
John Newbery 2018-04-20 14:16:57 -04:00
parent cab8be5adf
commit 4d355bfb2b
1 changed files with 29 additions and 24 deletions
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53
test/functional/test_framework/blocktools.py
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@ -40,8 +40,11 @@ from .script import (
)
from .util import assert_equal
# Create a block (with regtest difficulty)
# 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:
import time
@ -55,19 +58,16 @@ def create_block(hashprev, coinbase, ntime=None):
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)))
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
@ -82,7 +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:
@ -98,10 +97,11 @@ 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):
"""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))
@ -117,9 +117,10 @@ def create_coinbase(height, pubkey=None):
coinbase.calc_sha256()
return coinbase
# Create a transaction.
# If the script_pub_key is not specified, make it anyone-can-spend.
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))
@ -142,10 +143,12 @@ def get_legacy_sigopcount_tx(tx, accurate=True):
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):
"""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))
@ -157,9 +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)
@ -169,12 +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)