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#!/usr/bin/env python3
# Copyright (c) 2014-2020 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Helpful routines for regression testing."""
from base64 import b64encode
from decimal import Decimal, ROUND_DOWN
from subprocess import CalledProcessError
import hashlib
import inspect
import json
import logging
import os
import re
import time
import unittest
from . import coverage
from .authproxy import AuthServiceProxy, JSONRPCException
from typing import Callable, Optional
logger = logging.getLogger("TestFramework.utils")
# Assert functions
##################
def assert_approx(v, vexp, vspan=0.00001):
"""Assert that `v` is within `vspan` of `vexp`"""
if v < vexp - vspan:
raise AssertionError("%s < [%s..%s]" % (str(v), str(vexp - vspan), str(vexp + vspan)))
if v > vexp + vspan:
raise AssertionError("%s > [%s..%s]" % (str(v), str(vexp - vspan), str(vexp + vspan)))
def assert_fee_amount(fee, tx_size, fee_per_kB):
"""Assert the fee was in range"""
target_fee = round(tx_size * fee_per_kB / 1000, 8)
if fee < target_fee:
raise AssertionError("Fee of %s BTC too low! (Should be %s BTC)" % (str(fee), str(target_fee)))
# allow the wallet's estimation to be at most 2 bytes off
if fee > (tx_size + 2) * fee_per_kB / 1000:
raise AssertionError("Fee of %s BTC too high! (Should be %s BTC)" % (str(fee), str(target_fee)))
def assert_equal(thing1, thing2, *args):
if thing1 != thing2 or any(thing1 != arg for arg in args):
raise AssertionError("not(%s)" % " == ".join(str(arg) for arg in (thing1, thing2) + args))
def assert_greater_than(thing1, thing2):
if thing1 <= thing2:
raise AssertionError("%s <= %s" % (str(thing1), str(thing2)))
def assert_greater_than_or_equal(thing1, thing2):
if thing1 < thing2:
raise AssertionError("%s < %s" % (str(thing1), str(thing2)))
def assert_raises(exc, fun, *args, **kwds):
assert_raises_message(exc, None, fun, *args, **kwds)
def assert_raises_message(exc, message, fun, *args, **kwds):
try:
fun(*args, **kwds)
except JSONRPCException:
raise AssertionError("Use assert_raises_rpc_error() to test RPC failures")
except exc as e:
if message is not None and message not in e.error['message']:
raise AssertionError(
"Expected substring not found in error message:\nsubstring: '{}'\nerror message: '{}'.".format(
message, e.error['message']))
except Exception as e:
raise AssertionError("Unexpected exception raised: " + type(e).__name__)
else:
raise AssertionError("No exception raised")
def assert_raises_process_error(returncode: int, output: str, fun: Callable, *args, **kwds):
"""Execute a process and asserts the process return code and output.
Calls function `fun` with arguments `args` and `kwds`. Catches a CalledProcessError
and verifies that the return code and output are as expected. Throws AssertionError if
no CalledProcessError was raised or if the return code and output are not as expected.
Args:
returncode: the process return code.
output: [a substring of] the process output.
fun: the function to call. This should execute a process.
args*: positional arguments for the function.
kwds**: named arguments for the function.
"""
try:
fun(*args, **kwds)
except CalledProcessError as e:
if returncode != e.returncode:
raise AssertionError("Unexpected returncode %i" % e.returncode)
if output not in e.output:
raise AssertionError("Expected substring not found:" + e.output)
else:
raise AssertionError("No exception raised")
def assert_raises_rpc_error(code: Optional[int], message: Optional[str], fun: Callable, *args, **kwds):
"""Run an RPC and verify that a specific JSONRPC exception code and message is raised.
Calls function `fun` with arguments `args` and `kwds`. Catches a JSONRPCException
and verifies that the error code and message are as expected. Throws AssertionError if
no JSONRPCException was raised or if the error code/message are not as expected.
Args:
code: the error code returned by the RPC call (defined in src/rpc/protocol.h).
Set to None if checking the error code is not required.
message: [a substring of] the error string returned by the RPC call.
Set to None if checking the error string is not required.
fun: the function to call. This should be the name of an RPC.
args*: positional arguments for the function.
kwds**: named arguments for the function.
"""
assert try_rpc(code, message, fun, *args, **kwds), "No exception raised"
def try_rpc(code, message, fun, *args, **kwds):
"""Tries to run an rpc command.
Test against error code and message if the rpc fails.
Returns whether a JSONRPCException was raised."""
try:
fun(*args, **kwds)
except JSONRPCException as e:
# JSONRPCException was thrown as expected. Check the code and message values are correct.
if (code is not None) and (code != e.error["code"]):
raise AssertionError("Unexpected JSONRPC error code %i" % e.error["code"])
if (message is not None) and (message not in e.error['message']):
raise AssertionError(
"Expected substring not found in error message:\nsubstring: '{}'\nerror message: '{}'.".format(
message, e.error['message']))
return True
except Exception as e:
raise AssertionError("Unexpected exception raised: " + type(e).__name__)
else:
return False
def assert_is_hex_string(string):
try:
int(string, 16)
except Exception as e:
raise AssertionError("Couldn't interpret %r as hexadecimal; raised: %s" % (string, e))
def assert_is_hash_string(string, length=64):
if not isinstance(string, str):
raise AssertionError("Expected a string, got type %r" % type(string))
elif length and len(string) != length:
raise AssertionError("String of length %d expected; got %d" % (length, len(string)))
elif not re.match('[abcdef0-9]+$', string):
raise AssertionError("String %r contains invalid characters for a hash." % string)
def assert_array_result(object_array, to_match, expected, should_not_find=False):
"""
Pass in array of JSON objects, a dictionary with key/value pairs
to match against, and another dictionary with expected key/value
pairs.
If the should_not_find flag is true, to_match should not be found
in object_array
"""
if should_not_find:
assert_equal(expected, {})
num_matched = 0
for item in object_array:
all_match = True
for key, value in to_match.items():
if item[key] != value:
all_match = False
if not all_match:
continue
elif should_not_find:
num_matched = num_matched + 1
for key, value in expected.items():
if item[key] != value:
raise AssertionError("%s : expected %s=%s" % (str(item), str(key), str(value)))
num_matched = num_matched + 1
if num_matched == 0 and not should_not_find:
raise AssertionError("No objects matched %s" % (str(to_match)))
if num_matched > 0 and should_not_find:
raise AssertionError("Objects were found %s" % (str(to_match)))
# Utility functions
###################
def check_json_precision():
"""Make sure json library being used does not lose precision converting BTC values"""
n = Decimal("20000000.00000003")
satoshis = int(json.loads(json.dumps(float(n))) * 1.0e8)
if satoshis != 2000000000000003:
raise RuntimeError("JSON encode/decode loses precision")
def EncodeDecimal(o):
if isinstance(o, Decimal):
return str(o)
raise TypeError(repr(o) + " is not JSON serializable")
def count_bytes(hex_string):
return len(bytearray.fromhex(hex_string))
def str_to_b64str(string):
return b64encode(string.encode('utf-8')).decode('ascii')
def satoshi_round(amount):
return Decimal(amount).quantize(Decimal('0.00000001'), rounding=ROUND_DOWN)
def wait_until_helper(predicate, *, attempts=float('inf'), timeout=float('inf'), lock=None, timeout_factor=1.0):
"""Sleep until the predicate resolves to be True.
Warning: Note that this method is not recommended to be used in tests as it is
not aware of the context of the test framework. Using the `wait_until()` members
from `BitcoinTestFramework` or `P2PInterface` class ensures the timeout is
properly scaled. Furthermore, `wait_until()` from `P2PInterface` class in
`p2p.py` has a preset lock.
"""
if attempts == float('inf') and timeout == float('inf'):
timeout = 60
timeout = timeout * timeout_factor
attempt = 0
time_end = time.time() + timeout
while attempt < attempts and time.time() < time_end:
if lock:
with lock:
if predicate():
return
else:
if predicate():
return
attempt += 1
time.sleep(0.05)
# Print the cause of the timeout
predicate_source = "''''\n" + inspect.getsource(predicate) + "'''"
logger.error("wait_until() failed. Predicate: {}".format(predicate_source))
if attempt >= attempts:
raise AssertionError("Predicate {} not true after {} attempts".format(predicate_source, attempts))
elif time.time() >= time_end:
raise AssertionError("Predicate {} not true after {} seconds".format(predicate_source, timeout))
raise RuntimeError('Unreachable')
def sha256sum_file(filename):
h = hashlib.sha256()
with open(filename, 'rb') as f:
d = f.read(4096)
while len(d) > 0:
h.update(d)
d = f.read(4096)
return h.digest()
# RPC/P2P connection constants and functions
############################################
# The maximum number of nodes a single test can spawn
MAX_NODES = 12
# Don't assign rpc or p2p ports lower than this
PORT_MIN = int(os.getenv('TEST_RUNNER_PORT_MIN', default=11000))
# The number of ports to "reserve" for p2p and rpc, each
PORT_RANGE = 5000
class PortSeed:
# Must be initialized with a unique integer for each process
n = None
def get_rpc_proxy(url: str, node_number: int, *, timeout: int=None, coveragedir: str=None) -> coverage.AuthServiceProxyWrapper:
"""
Args:
url: URL of the RPC server to call
node_number: the node number (or id) that this calls to
Kwargs:
timeout: HTTP timeout in seconds
coveragedir: Directory
Returns:
AuthServiceProxy. convenience object for making RPC calls.
"""
proxy_kwargs = {}
if timeout is not None:
proxy_kwargs['timeout'] = int(timeout)
proxy = AuthServiceProxy(url, **proxy_kwargs)
coverage_logfile = coverage.get_filename(coveragedir, node_number) if coveragedir else None
return coverage.AuthServiceProxyWrapper(proxy, url, coverage_logfile)
def p2p_port(n):
assert n <= MAX_NODES
return PORT_MIN + n + (MAX_NODES * PortSeed.n) % (PORT_RANGE - 1 - MAX_NODES)
def rpc_port(n):
return PORT_MIN + PORT_RANGE + n + (MAX_NODES * PortSeed.n) % (PORT_RANGE - 1 - MAX_NODES)
def rpc_url(datadir, i, chain, rpchost):
rpc_u, rpc_p = get_auth_cookie(datadir, chain)
host = '127.0.0.1'
port = rpc_port(i)
if rpchost:
parts = rpchost.split(':')
if len(parts) == 2:
host, port = parts
else:
host = rpchost
return "http://%s:%s@%s:%d" % (rpc_u, rpc_p, host, int(port))
# Node functions
################
def initialize_datadir(dirname, n, chain, disable_autoconnect=True):
datadir = get_datadir_path(dirname, n)
if not os.path.isdir(datadir):
os.makedirs(datadir)
write_config(os.path.join(datadir, "bitcoin.conf"), n=n, chain=chain, disable_autoconnect=disable_autoconnect)
os.makedirs(os.path.join(datadir, 'stderr'), exist_ok=True)
os.makedirs(os.path.join(datadir, 'stdout'), exist_ok=True)
return datadir
def write_config(config_path, *, n, chain, extra_config="", disable_autoconnect=True):
# Translate chain subdirectory name to config name
if chain == 'testnet3':
chain_name_conf_arg = 'testnet'
chain_name_conf_section = 'test'
else:
chain_name_conf_arg = chain
chain_name_conf_section = chain
with open(config_path, 'w', encoding='utf8') as f:
if chain_name_conf_arg:
f.write("{}=1\n".format(chain_name_conf_arg))
if chain_name_conf_section:
f.write("[{}]\n".format(chain_name_conf_section))
f.write("port=" + str(p2p_port(n)) + "\n")
f.write("rpcport=" + str(rpc_port(n)) + "\n")
f.write("fallbackfee=0.0002\n")
f.write("server=1\n")
f.write("keypool=1\n")
f.write("discover=0\n")
f.write("dnsseed=0\n")
f.write("fixedseeds=0\n")
f.write("listenonion=0\n")
# Increase peertimeout to avoid disconnects while using mocktime.
# peertimeout is measured in wall clock time, so setting it to the
# duration of the longest test is sufficient. It can be overriden in
# tests.
f.write("peertimeout=999999\n")
f.write("printtoconsole=0\n")
f.write("upnp=0\n")
f.write("natpmp=0\n")
f.write("shrinkdebugfile=0\n")
# To improve SQLite wallet performance so that the tests don't timeout, use -unsafesqlitesync
f.write("unsafesqlitesync=1\n")
if disable_autoconnect:
f.write("connect=0\n")
f.write(extra_config)
def get_datadir_path(dirname, n):
return os.path.join(dirname, "node" + str(n))
def append_config(datadir, options):
with open(os.path.join(datadir, "bitcoin.conf"), 'a', encoding='utf8') as f:
for option in options:
f.write(option + "\n")
def get_auth_cookie(datadir, chain):
user = None
password = None
if os.path.isfile(os.path.join(datadir, "bitcoin.conf")):
with open(os.path.join(datadir, "bitcoin.conf"), 'r', encoding='utf8') as f:
for line in f:
if line.startswith("rpcuser="):
assert user is None # Ensure that there is only one rpcuser line
user = line.split("=")[1].strip("\n")
if line.startswith("rpcpassword="):
assert password is None # Ensure that there is only one rpcpassword line
password = line.split("=")[1].strip("\n")
try:
with open(os.path.join(datadir, chain, ".cookie"), 'r', encoding="ascii") as f:
userpass = f.read()
split_userpass = userpass.split(':')
user = split_userpass[0]
password = split_userpass[1]
except OSError:
pass
if user is None or password is None:
raise ValueError("No RPC credentials")
return user, password
# If a cookie file exists in the given datadir, delete it.
def delete_cookie_file(datadir, chain):
if os.path.isfile(os.path.join(datadir, chain, ".cookie")):
logger.debug("Deleting leftover cookie file")
os.remove(os.path.join(datadir, chain, ".cookie"))
def softfork_active(node, key):
"""Return whether a softfork is active."""
return node.getblockchaininfo()['softforks'][key]['active']
def set_node_times(nodes, t):
for node in nodes:
node.setmocktime(t)
# Transaction/Block functions
#############################
def find_output(node, txid, amount, *, blockhash=None):
"""
Return index to output of txid with value amount
Raises exception if there is none.
"""
txdata = node.getrawtransaction(txid, 1, blockhash)
for i in range(len(txdata["vout"])):
if txdata["vout"][i]["value"] == amount:
return i
raise RuntimeError("find_output txid %s : %s not found" % (txid, str(amount)))
# Helper to create at least "count" utxos
# Pass in a fee that is sufficient for relay and mining new transactions.
def create_confirmed_utxos(test_framework, fee, node, count):
to_generate = int(0.5 * count) + 101
while to_generate > 0:
test_framework.generate(node, min(25, to_generate))
to_generate -= 25
utxos = node.listunspent()
iterations = count - len(utxos)
addr1 = node.getnewaddress()
addr2 = node.getnewaddress()
if iterations <= 0:
return utxos
for _ in range(iterations):
t = utxos.pop()
inputs = []
inputs.append({"txid": t["txid"], "vout": t["vout"]})
outputs = {}
send_value = t['amount'] - fee
outputs[addr1] = satoshi_round(send_value / 2)
outputs[addr2] = satoshi_round(send_value / 2)
raw_tx = node.createrawtransaction(inputs, outputs)
signed_tx = node.signrawtransactionwithwallet(raw_tx)["hex"]
node.sendrawtransaction(signed_tx)
while (node.getmempoolinfo()['size'] > 0):
test_framework.generate(node, 1)
utxos = node.listunspent()
assert len(utxos) >= count
return utxos
def chain_transaction(node, parent_txids, vouts, value, fee, num_outputs):
"""Build and send a transaction that spends the given inputs (specified
by lists of parent_txid:vout each), with the desired total value and fee,
equally divided up to the desired number of outputs.
Returns a tuple with the txid and the amount sent per output.
"""
send_value = satoshi_round((value - fee)/num_outputs)
inputs = []
for (txid, vout) in zip(parent_txids, vouts):
inputs.append({'txid' : txid, 'vout' : vout})
outputs = {}
for _ in range(num_outputs):
outputs[node.getnewaddress()] = send_value
rawtx = node.createrawtransaction(inputs, outputs, 0, True)
signedtx = node.signrawtransactionwithwallet(rawtx)
txid = node.sendrawtransaction(signedtx['hex'])
fulltx = node.getrawtransaction(txid, 1)
assert len(fulltx['vout']) == num_outputs # make sure we didn't generate a change output
return (txid, send_value)
# Create large OP_RETURN txouts that can be appended to a transaction
# to make it large (helper for constructing large transactions).
def gen_return_txouts():
# Some pre-processing to create a bunch of OP_RETURN txouts to insert into transactions we create
# So we have big transactions (and therefore can't fit very many into each block)
# create one script_pubkey
script_pubkey = "6a4d0200" # OP_RETURN OP_PUSH2 512 bytes
for _ in range(512):
script_pubkey = script_pubkey + "01"
# concatenate 128 txouts of above script_pubkey which we'll insert before the txout for change
txouts = []
from .messages import CTxOut
txout = CTxOut()
txout.nValue = 0
txout.scriptPubKey = bytes.fromhex(script_pubkey)
for _ in range(128):
txouts.append(txout)
return txouts
# Create a spend of each passed-in utxo, splicing in "txouts" to each raw
# transaction to make it large. See gen_return_txouts() above.
def create_lots_of_big_transactions(node, txouts, utxos, num, fee):
addr = node.getnewaddress()
txids = []
from .messages import tx_from_hex
for _ in range(num):
t = utxos.pop()
inputs = [{"txid": t["txid"], "vout": t["vout"]}]
outputs = {}
change = t['amount'] - fee
outputs[addr] = satoshi_round(change)
rawtx = node.createrawtransaction(inputs, outputs)
tx = tx_from_hex(rawtx)
for txout in txouts:
tx.vout.append(txout)
newtx = tx.serialize().hex()
signresult = node.signrawtransactionwithwallet(newtx, None, "NONE")
txid = node.sendrawtransaction(signresult["hex"], 0)
txids.append(txid)
return txids
def mine_large_block(test_framework, node, utxos=None):
# generate a 66k transaction,
# and 14 of them is close to the 1MB block limit
num = 14
txouts = gen_return_txouts()
utxos = utxos if utxos is not None else []
if len(utxos) < num:
utxos.clear()
utxos.extend(node.listunspent())
fee = 100 * node.getnetworkinfo()["relayfee"]
create_lots_of_big_transactions(node, txouts, utxos, num, fee=fee)
test_framework.generate(node, 1)
def generate_to_height(test_framework, node, target_height):
"""Generates blocks until a given target block height has been reached.
To prevent timeouts, only up to 200 blocks are generated per RPC call.
Can be used to activate certain soft-forks (e.g. CSV, CLTV)."""
current_height = node.getblockcount()
while current_height < target_height:
nblocks = min(200, target_height - current_height)
current_height += len(test_framework.generate(node, nblocks))
assert_equal(node.getblockcount(), target_height)
def find_vout_for_address(node, txid, addr):
"""
Locate the vout index of the given transaction sending to the
given address. Raises runtime error exception if not found.
"""
tx = node.getrawtransaction(txid, True)
for i in range(len(tx["vout"])):
if addr == tx["vout"][i]["scriptPubKey"]["address"]:
return i
raise RuntimeError("Vout not found for address: txid=%s, addr=%s" % (txid, addr))
def modinv(a, n):
"""Compute the modular inverse of a modulo n using the extended Euclidean
Algorithm. See https://en.wikipedia.org/wiki/Extended_Euclidean_algorithm#Modular_integers.
"""
# TODO: Change to pow(a, -1, n) available in Python 3.8
t1, t2 = 0, 1
r1, r2 = n, a
while r2 != 0:
q = r1 // r2
t1, t2 = t2, t1 - q * t2
r1, r2 = r2, r1 - q * r2
if r1 > 1:
return None
if t1 < 0:
t1 += n
return t1
class TestFrameworkUtil(unittest.TestCase):
def test_modinv(self):
test_vectors = [
[7, 11],
[11, 29],
[90, 13],
[1891, 3797],
[6003722857, 77695236973],
]
for a, n in test_vectors:
self.assertEqual(modinv(a, n), pow(a, n-2, n))
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