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[tests] p2p_segwit: standardise comments/docstrings.

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pull/585/head
John Newbery 7 years ago
parent f7c7f8ecf3
commit 94a0134a40
1 changed files with 71 additions and 54 deletions
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125
test/functional/p2p_segwit.py
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@ -90,9 +90,10 @@ VB_TOP_BITS = 0x20000000
MAX_SIGOP_COST = 80000
# Calculate the virtual size of a witness block:
# (base + witness/4)
def get_virtual_size(witness_block):
"""Calculate the virtual size of a witness block.
Virtual size is base + witness/4."""
base_size = len(witness_block.serialize(with_witness=False))
total_size = len(witness_block.serialize(with_witness=True))
# the "+3" is so we round up
@ -171,25 +172,24 @@ class TestP2PConn(P2PInterface):
self.wait_for_block(blockhash, timeout)
return self.last_message["block"].block
# Used to keep track of anyone-can-spend outputs that we can use in the tests
class UTXO():
"""Used to keep track of anyone-can-spend outputs that we can use in the tests."""
def __init__(self, sha256, n, value):
self.sha256 = sha256
self.n = n
self.nValue = value
# Helper for getting the script associated with a P2PKH
def get_p2pkh_script(pubkeyhash):
"""Get the script associated with a P2PKH."""
return CScript([CScriptOp(OP_DUP), CScriptOp(OP_HASH160), pubkeyhash, CScriptOp(OP_EQUALVERIFY), CScriptOp(OP_CHECKSIG)])
# Add signature for a P2PK witness program.
def sign_p2pk_witness_input(script, tx_to, in_idx, hashtype, value, key):
"""Add signature for a P2PK witness program."""
tx_hash = SegwitVersion1SignatureHash(script, tx_to, in_idx, hashtype, value)
signature = key.sign(tx_hash) + chr(hashtype).encode('latin-1')
tx_to.wit.vtxinwit[in_idx].scriptWitness.stack = [signature, script]
tx_to.rehash()
class SegWitTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
@ -203,9 +203,10 @@ class SegWitTest(BitcoinTestFramework):
connect_nodes(self.nodes[0], 2)
self.sync_all()
''' Helpers '''
# Build a block on top of node0's tip.
# Helper functions
def build_next_block(self, version=4):
"""Build a block on top of node0's tip."""
tip = self.nodes[0].getbestblockhash()
height = self.nodes[0].getblockcount() + 1
block_time = self.nodes[0].getblockheader(tip)["mediantime"] + 1
@ -214,21 +215,21 @@ class SegWitTest(BitcoinTestFramework):
block.rehash()
return block
# Adds list of transactions to block, adds witness commitment, then solves.
def update_witness_block_with_transactions(self, block, tx_list, nonce=0):
"""Add list of transactions to block, adds witness commitment, then solves."""
block.vtx.extend(tx_list)
add_witness_commitment(block, nonce)
block.solve()
return
''' Individual tests '''
# Individual tests
def test_witness_services(self):
self.log.info("Verifying NODE_WITNESS service bit")
assert((self.test_node.nServices & NODE_WITNESS) != 0)
# See if sending a regular transaction works, and create a utxo
# to use in later tests.
def test_non_witness_transaction(self):
"""See if sending a regular transaction works, and create a utxo to use in later tests."""
# Mine a block with an anyone-can-spend coinbase,
# let it mature, then try to spend it.
self.log.info("Testing non-witness transaction")
@ -257,8 +258,8 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.append(UTXO(tx.sha256, 0, 49 * 100000000))
self.nodes[0].generate(1)
# Verify that blocks with witnesses are rejected before activation.
def test_unnecessary_witness_before_segwit_activation(self):
"""Verify that blocks with witnesses are rejected before activation."""
self.log.info("Testing behavior of unnecessary witnesses")
# For now, rely on earlier tests to have created at least one utxo for
# us to use
@ -299,14 +300,17 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(tx.sha256, 0, tx.vout[0].nValue))
# ~6 months after segwit activation, the SCRIPT_VERIFY_WITNESS flag was
# backdated so that it applies to all blocks, going back to the genesis
# block.
#
# Consequently, version 0 witness outputs are never spendable without
# witness, and so can't be spent before segwit activation (the point at which
# blocks are permitted to contain witnesses).
def test_v0_outputs_arent_spendable(self):
"""Test that v0 outputs aren't spendable before segwit activation.
~6 months after segwit activation, the SCRIPT_VERIFY_WITNESS flag was
backdated so that it applies to all blocks, going back to the genesis
block.
Consequently, version 0 witness outputs are never spendable without
witness, and so can't be spent before segwit activation (the point at which
blocks are permitted to contain witnesses)."""
self.log.info("Testing that v0 witness program outputs aren't spendable before activation")
assert len(self.utxo), "self.utxo is empty"
@ -374,8 +378,8 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(txid, 2, value))
# Mine enough blocks for segwit's vb state to be 'started'.
def advance_to_segwit_started(self):
"""Mine enough blocks for segwit's vb state to be 'started'."""
height = self.nodes[0].getblockcount()
# Will need to rewrite the tests here if we are past the first period
assert(height < VB_PERIOD - 1)
@ -385,10 +389,11 @@ class SegWitTest(BitcoinTestFramework):
self.nodes[0].generate(VB_PERIOD - height - 1)
assert_equal(get_bip9_status(self.nodes[0], 'segwit')['status'], 'started')
# Mine enough blocks to lock in segwit, but don't activate.
# TODO: we could verify that lockin only happens at the right threshold of
# signalling blocks, rather than just at the right period boundary.
def advance_to_segwit_lockin(self):
"""Mine enough blocks to lock in segwit, but don't activate."""
# TODO: we could verify that lockin only happens at the right threshold of
# signalling blocks, rather than just at the right period boundary.
height = self.nodes[0].getblockcount()
assert_equal(get_bip9_status(self.nodes[0], 'segwit')['status'], 'started')
# Advance to end of period, and verify lock-in happens at the end
@ -399,10 +404,11 @@ class SegWitTest(BitcoinTestFramework):
self.nodes[0].generate(1)
assert_equal(get_bip9_status(self.nodes[0], 'segwit')['status'], 'locked_in')
# Mine enough blocks to activate segwit.
# TODO: we could verify that activation only happens at the right threshold
# of signalling blocks, rather than just at the right period boundary.
def advance_to_segwit_active(self):
"""Mine enough blocks to activate segwit."""
# TODO: we could verify that activation only happens at the right threshold
# of signalling blocks, rather than just at the right period boundary.
assert_equal(get_bip9_status(self.nodes[0], 'segwit')['status'], 'locked_in')
height = self.nodes[0].getblockcount()
self.nodes[0].generate(VB_PERIOD - (height % VB_PERIOD) - 2)
@ -410,8 +416,11 @@ class SegWitTest(BitcoinTestFramework):
self.nodes[0].generate(1)
assert_equal(get_bip9_status(self.nodes[0], 'segwit')['status'], 'active')
# This test can only be run after segwit has activated
def test_witness_commitments(self):
"""Test witness commitments.
This test can only be run after segwit has activated."""
self.log.info("Testing witness commitments")
# First try a correct witness commitment.
@ -617,9 +626,8 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(block.vtx[-1].sha256, 0, block.vtx[-1].vout[0].nValue))
# submitblock will try to add the nonce automatically, so that mining
# software doesn't need to worry about doing so itself.
def test_submit_block(self):
"""Test that submitblock adds the nonce automatically when possible."""
block = self.build_next_block()
# Try using a custom nonce and then don't supply it.
@ -653,8 +661,8 @@ class SegWitTest(BitcoinTestFramework):
# Tip should not advance!
assert(self.nodes[0].getbestblockhash() != block_2.hash)
# Consensus tests of extra witness data in a transaction.
def test_extra_witness_data(self):
"""Test extra witness data in a transaction."""
self.log.info("Testing extra witness data in tx")
assert(len(self.utxo) > 0)
@ -729,7 +737,7 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
def test_max_witness_push_length(self):
''' Should only allow up to 520 byte pushes in witness stack '''
"""Test that witness stack can only allow up to 520 byte pushes."""
self.log.info("Testing maximum witness push size")
MAX_SCRIPT_ELEMENT_SIZE = 520
assert(len(self.utxo))
@ -768,8 +776,7 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
def test_max_witness_program_length(self):
# Can create witness outputs that are long, but can't be greater than
# 10k bytes to successfully spend
"""Test that witness outputs greater than 10kB can't be spent."""
self.log.info("Testing maximum witness program length")
assert(len(self.utxo))
MAX_PROGRAM_LENGTH = 10000
@ -817,7 +824,7 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.append(UTXO(tx2.sha256, 0, tx2.vout[0].nValue))
def test_witness_input_length(self):
''' Ensure that vin length must match vtxinwit length '''
"""Test that vin length must match vtxinwit length."""
self.log.info("Testing witness input length")
assert(len(self.utxo))
@ -941,11 +948,14 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(tx_hash, 0, tx_value))
# After segwit activates, verify that mempool:
# - rejects transactions with unnecessary/extra witnesses
# - accepts transactions with valid witnesses
# and that witness transactions are relayed to non-upgraded peers.
def test_tx_relay_after_segwit_activation(self):
"""Test transaction relay after segwit activation.
After segwit activates, verify that mempool:
- rejects transactions with unnecessary/extra witnesses
- accepts transactions with valid witnesses
and that witness transactions are relayed to non-upgraded peers."""
self.log.info("Testing relay of witness transactions")
# Generate a transaction that doesn't require a witness, but send it
# with a witness. Should be rejected because we can't use a witness
@ -1032,10 +1042,11 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
# Test that block requests to NODE_WITNESS peer are with MSG_WITNESS_FLAG
# This is true regardless of segwit activation.
# Also test that we don't ask for blocks from unupgraded peers
def test_block_relay(self, segwit_activated):
"""Test that block requests to NODE_WITNESS peer are with MSG_WITNESS_FLAG.
This is true regardless of segwit activation.
Also test that we don't ask for blocks from unupgraded peers."""
self.log.info("Testing block relay")
blocktype = 2 | MSG_WITNESS_FLAG
@ -1127,8 +1138,12 @@ class SegWitTest(BitcoinTestFramework):
self.old_node.announce_tx_and_wait_for_getdata(block4.vtx[0])
assert(block4.sha256 not in self.old_node.getdataset)
# V0 segwit outputs and inputs are always standard. V0 segwit inputs may only be mined after activation, but not before.
def test_standardness_v0(self, segwit_activated):
"""Test V0 txout standardness.
V0 segwit outputs and inputs are always standard.
V0 segwit inputs may only be mined after activation, but not before."""
self.log.info("Testing standardness of v0 outputs (%s activation)" % ("after" if segwit_activated else "before"))
assert(len(self.utxo))
@ -1203,9 +1218,12 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.append(UTXO(tx3.sha256, 0, tx3.vout[0].nValue))
assert_equal(len(self.nodes[1].getrawmempool()), 0)
# Verify that future segwit upgraded transactions are non-standard,
# but valid in blocks. Can run this before and after segwit activation.
def test_segwit_versions(self):
"""Test validity of future segwit version transactions.
Future segwit version transactions are non-standard, but valid in blocks.
Can run this before and after segwit activation."""
self.log.info("Testing standardness/consensus for segwit versions (0-16)")
assert(len(self.utxo))
num_tests = 17 # will test OP_0, OP1, ..., OP_16
@ -1504,8 +1522,8 @@ class SegWitTest(BitcoinTestFramework):
for i in range(len(tx.vout)):
self.utxo.append(UTXO(tx.sha256, i, tx.vout[i].nValue))
# Test P2SH wrapped witness programs.
def test_p2sh_witness(self, segwit_activated):
"""Test P2SH wrapped witness programs."""
self.log.info("Testing P2SH witness transactions")
assert(len(self.utxo))
@ -1574,12 +1592,8 @@ class SegWitTest(BitcoinTestFramework):
self.utxo.pop(0)
self.utxo.append(UTXO(spend_tx.sha256, 0, spend_tx.vout[0].nValue))
# Test the behavior of starting up a segwit-aware node after the softfork
# has activated. As segwit requires different block data than pre-segwit
# nodes would have stored, this requires special handling.
# To enable this test, pass --oldbinary=<path-to-pre-segwit-bitcoind> to
# the test.
def test_upgrade_after_activation(self, node_id):
"""Test the behavior of starting up a segwit-aware node after the softfork has activated."""
self.log.info("Testing software upgrade after softfork activation")
assert(node_id != 0) # node0 is assumed to be a segwit-active bitcoind
@ -1606,7 +1620,7 @@ class SegWitTest(BitcoinTestFramework):
height -= 1
def test_witness_sigops(self):
'''Ensure sigop counting is correct inside witnesses.'''
"""Test sigop counting is correct inside witnesses."""
self.log.info("Testing sigops limit")
assert(len(self.utxo))
@ -1755,9 +1769,12 @@ class SegWitTest(BitcoinTestFramework):
self.nodes[0].setmocktime(0)
self.nodes[2].setmocktime(0)
# Uncompressed pubkeys are no longer supported in default relay policy,
# but (for now) are still valid in blocks.
def test_uncompressed_pubkey(self):
"""Test uncompressed pubkey validity in segwit transactions.
Uncompressed pubkeys are no longer supported in default relay policy,
but (for now) are still valid in blocks."""
self.log.info("Testing uncompressed pubkeys")
# Segwit transactions using uncompressed pubkeys are not accepted
# under default policy, but should still pass consensus.

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