# Copyright (c) 2014 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 # # Add python-bitcoinrpc to module search path: import os import sys sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), "python-bitcoinrpc")) from decimal import Decimal, ROUND_DOWN import json import random import shutil import subprocess import time import re from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException from util import * def p2p_port(n): return 11000 + n + os.getpid()%999 def rpc_port(n): return 12000 + n + os.getpid()%999 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 sync_blocks(rpc_connections): """ Wait until everybody has the same block count """ while True: counts = [ x.getblockcount() for x in rpc_connections ] if counts == [ counts[0] ]*len(counts): break time.sleep(1) def sync_mempools(rpc_connections): """ Wait until everybody has the same transactions in their memory pools """ while True: pool = set(rpc_connections[0].getrawmempool()) num_match = 1 for i in range(1, len(rpc_connections)): if set(rpc_connections[i].getrawmempool()) == pool: num_match = num_match+1 if num_match == len(rpc_connections): break time.sleep(1) bitcoind_processes = {} def initialize_datadir(dir, n): datadir = os.path.join(dir, "node"+str(n)) if not os.path.isdir(datadir): os.makedirs(datadir) with open(os.path.join(datadir, "bitcoin.conf"), 'w') as f: f.write("regtest=1\n"); f.write("rpcuser=rt\n"); f.write("rpcpassword=rt\n"); f.write("port="+str(p2p_port(n))+"\n"); f.write("rpcport="+str(rpc_port(n))+"\n"); return datadir def initialize_chain(test_dir): """ Create (or copy from cache) a 200-block-long chain and 4 wallets. bitcoind and bitcoin-cli must be in search path. """ if not os.path.isdir(os.path.join("cache", "node0")): devnull = open("/dev/null", "w+") # Create cache directories, run bitcoinds: for i in range(4): datadir=initialize_datadir("cache", i) args = [ "bitcoind", "-keypool=1", "-datadir="+datadir, "-discover=0" ] if i > 0: args.append("-connect=127.0.0.1:"+str(p2p_port(0))) bitcoind_processes[i] = subprocess.Popen(args) subprocess.check_call([ "bitcoin-cli", "-datadir="+datadir, "-rpcwait", "getblockcount"], stdout=devnull) devnull.close() rpcs = [] for i in range(4): try: url = "http://rt:rt@127.0.0.1:%d"%(rpc_port(i),) rpcs.append(AuthServiceProxy(url)) except: sys.stderr.write("Error connecting to "+url+"\n") sys.exit(1) # Create a 200-block-long chain; each of the 4 nodes # gets 25 mature blocks and 25 immature. for i in range(4): rpcs[i].setgenerate(True, 25) sync_blocks(rpcs) for i in range(4): rpcs[i].setgenerate(True, 25) sync_blocks(rpcs) # Shut them down, and remove debug.logs: stop_nodes(rpcs) wait_bitcoinds() for i in range(4): os.remove(debug_log("cache", i)) for i in range(4): from_dir = os.path.join("cache", "node"+str(i)) to_dir = os.path.join(test_dir, "node"+str(i)) shutil.copytree(from_dir, to_dir) initialize_datadir(test_dir, i) # Overwrite port/rpcport in bitcoin.conf def _rpchost_to_args(rpchost): '''Convert optional IP:port spec to rpcconnect/rpcport args''' if rpchost is None: return [] match = re.match('(\[[0-9a-fA-f:]+\]|[^:]+)(?::([0-9]+))?$', rpchost) if not match: raise ValueError('Invalid RPC host spec ' + rpchost) rpcconnect = match.group(1) rpcport = match.group(2) if rpcconnect.startswith('['): # remove IPv6 [...] wrapping rpcconnect = rpcconnect[1:-1] rv = ['-rpcconnect=' + rpcconnect] if rpcport: rv += ['-rpcport=' + rpcport] return rv def start_node(i, dir, extra_args=None, rpchost=None): """ Start a bitcoind and return RPC connection to it """ datadir = os.path.join(dir, "node"+str(i)) args = [ "bitcoind", "-datadir="+datadir, "-keypool=1", "-discover=0" ] if extra_args is not None: args.extend(extra_args) bitcoind_processes[i] = subprocess.Popen(args) devnull = open("/dev/null", "w+") subprocess.check_call([ "bitcoin-cli", "-datadir="+datadir] + _rpchost_to_args(rpchost) + ["-rpcwait", "getblockcount"], stdout=devnull) devnull.close() url = "http://rt:rt@%s:%d" % (rpchost or '127.0.0.1', rpc_port(i)) proxy = AuthServiceProxy(url) proxy.url = url # store URL on proxy for info return proxy def start_nodes(num_nodes, dir, extra_args=None, rpchost=None): """ Start multiple bitcoinds, return RPC connections to them """ if extra_args is None: extra_args = [ None for i in range(num_nodes) ] return [ start_node(i, dir, extra_args[i], rpchost) for i in range(num_nodes) ] def debug_log(dir, n_node): return os.path.join(dir, "node"+str(n_node), "regtest", "debug.log") def stop_node(node, i): node.stop() bitcoind_processes[i].wait() del bitcoind_processes[i] def stop_nodes(nodes): for i in range(len(nodes)): nodes[i].stop() del nodes[:] # Emptying array closes connections as a side effect def wait_bitcoinds(): # Wait for all bitcoinds to cleanly exit for bitcoind in bitcoind_processes.values(): bitcoind.wait() bitcoind_processes.clear() def connect_nodes(from_connection, node_num): ip_port = "127.0.0.1:"+str(p2p_port(node_num)) from_connection.addnode(ip_port, "onetry") # poll until version handshake complete to avoid race conditions # with transaction relaying while any(peer['version'] == 0 for peer in from_connection.getpeerinfo()): time.sleep(0.1) def connect_nodes_bi(nodes, a, b): connect_nodes(nodes[a], b) connect_nodes(nodes[b], a) def find_output(node, txid, amount): """ Return index to output of txid with value amount Raises exception if there is none. """ txdata = node.getrawtransaction(txid, 1) 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))) def gather_inputs(from_node, amount_needed): """ Return a random set of unspent txouts that are enough to pay amount_needed """ utxo = from_node.listunspent(1) random.shuffle(utxo) inputs = [] total_in = Decimal("0.00000000") while total_in < amount_needed and len(utxo) > 0: t = utxo.pop() total_in += t["amount"] inputs.append({ "txid" : t["txid"], "vout" : t["vout"], "address" : t["address"] } ) if total_in < amount_needed: raise RuntimeError("Insufficient funds: need %d, have %d"%(amount+fee*2, total_in)) return (total_in, inputs) def make_change(from_node, amount_in, amount_out, fee): """ Create change output(s), return them """ outputs = {} amount = amount_out+fee change = amount_in - amount if change > amount*2: # Create an extra change output to break up big inputs change_address = from_node.getnewaddress() # Split change in two, being careful of rounding: outputs[change_address] = Decimal(change/2).quantize(Decimal('0.00000001'), rounding=ROUND_DOWN) change = amount_in - amount - outputs[change_address] if change > 0: outputs[from_node.getnewaddress()] = change return outputs def send_zeropri_transaction(from_node, to_node, amount, fee): """ Create&broadcast a zero-priority transaction. Returns (txid, hex-encoded-txdata) Ensures transaction is zero-priority by first creating a send-to-self, then using it's output """ # Create a send-to-self with confirmed inputs: self_address = from_node.getnewaddress() (total_in, inputs) = gather_inputs(from_node, amount+fee*2) outputs = make_change(from_node, total_in, amount+fee, fee) outputs[self_address] = float(amount+fee) self_rawtx = from_node.createrawtransaction(inputs, outputs) self_signresult = from_node.signrawtransaction(self_rawtx) self_txid = from_node.sendrawtransaction(self_signresult["hex"], True) vout = find_output(from_node, self_txid, amount+fee) # Now immediately spend the output to create a 1-input, 1-output # zero-priority transaction: inputs = [ { "txid" : self_txid, "vout" : vout } ] outputs = { to_node.getnewaddress() : float(amount) } rawtx = from_node.createrawtransaction(inputs, outputs) signresult = from_node.signrawtransaction(rawtx) txid = from_node.sendrawtransaction(signresult["hex"], True) return (txid, signresult["hex"]) def random_zeropri_transaction(nodes, amount, min_fee, fee_increment, fee_variants): """ Create a random zero-priority transaction. Returns (txid, hex-encoded-transaction-data, fee) """ from_node = random.choice(nodes) to_node = random.choice(nodes) fee = min_fee + fee_increment*random.randint(0,fee_variants) (txid, txhex) = send_zeropri_transaction(from_node, to_node, amount, fee) return (txid, txhex, fee) def random_transaction(nodes, amount, min_fee, fee_increment, fee_variants): """ Create a random transaction. Returns (txid, hex-encoded-transaction-data, fee) """ from_node = random.choice(nodes) to_node = random.choice(nodes) fee = min_fee + fee_increment*random.randint(0,fee_variants) (total_in, inputs) = gather_inputs(from_node, amount+fee) outputs = make_change(from_node, total_in, amount, fee) outputs[to_node.getnewaddress()] = float(amount) rawtx = from_node.createrawtransaction(inputs, outputs) signresult = from_node.signrawtransaction(rawtx) txid = from_node.sendrawtransaction(signresult["hex"], True) return (txid, signresult["hex"], fee) def assert_equal(thing1, thing2): if thing1 != thing2: raise AssertionError("%s != %s"%(str(thing1),str(thing2)))