#!/usr/bin/env python3 # Copyright (c) 2017 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. """Class for bitcoind node under test""" import decimal import errno import http.client import json import logging import os import re import subprocess import time from .authproxy import JSONRPCException from .util import ( assert_equal, delete_cookie_file, get_rpc_proxy, rpc_url, wait_until, p2p_port, ) # For Python 3.4 compatibility JSONDecodeError = getattr(json, "JSONDecodeError", ValueError) BITCOIND_PROC_WAIT_TIMEOUT = 60 class TestNode(): """A class for representing a bitcoind node under test. This class contains: - state about the node (whether it's running, etc) - a Python subprocess.Popen object representing the running process - an RPC connection to the node - one or more P2P connections to the node To make things easier for the test writer, any unrecognised messages will be dispatched to the RPC connection.""" def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir, use_cli=False): self.index = i self.datadir = os.path.join(dirname, "node" + str(i)) self.rpchost = rpchost if timewait: self.rpc_timeout = timewait else: # Wait for up to 60 seconds for the RPC server to respond self.rpc_timeout = 60 if binary is None: self.binary = os.getenv("LITECOIND", "litecoind") else: self.binary = binary self.stderr = stderr self.coverage_dir = coverage_dir # Most callers will just need to add extra args to the standard list below. For those callers that need more flexibity, they can just set the args property directly. self.extra_args = extra_args self.args = [self.binary, "-datadir=" + self.datadir, "-server", "-keypool=1", "-discover=0", "-rest", "-logtimemicros", "-debug", "-debugexclude=libevent", "-debugexclude=leveldb", "-mocktime=" + str(mocktime), "-uacomment=testnode%d" % i] self.cli = TestNodeCLI(os.getenv("LITECOINCLI", "litecoin-cli"), self.datadir) self.use_cli = use_cli self.running = False self.process = None self.rpc_connected = False self.rpc = None self.url = None self.log = logging.getLogger('TestFramework.node%d' % i) self.cleanup_on_exit = True # Whether to kill the node when this object goes away self.p2ps = [] def __del__(self): # Ensure that we don't leave any bitcoind processes lying around after # the test ends if self.process and self.cleanup_on_exit: # Should only happen on test failure # Avoid using logger, as that may have already been shutdown when # this destructor is called. print("Cleaning up leftover process") self.process.kill() def __getattr__(self, name): """Dispatches any unrecognised messages to the RPC connection or a CLI instance.""" if self.use_cli: return getattr(self.cli, name) else: assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection" return getattr(self.rpc, name) def start(self, extra_args=None, stderr=None, *args, **kwargs): """Start the node.""" if extra_args is None: extra_args = self.extra_args if stderr is None: stderr = self.stderr # Delete any existing cookie file -- if such a file exists (eg due to # unclean shutdown), it will get overwritten anyway by bitcoind, and # potentially interfere with our attempt to authenticate delete_cookie_file(self.datadir) self.process = subprocess.Popen(self.args + extra_args, stderr=stderr, *args, **kwargs) self.running = True self.log.debug("litecoind started, waiting for RPC to come up") def wait_for_rpc_connection(self): """Sets up an RPC connection to the bitcoind process. Returns False if unable to connect.""" # Poll at a rate of four times per second poll_per_s = 4 for _ in range(poll_per_s * self.rpc_timeout): assert self.process.poll() is None, "litecoind exited with status %i during initialization" % self.process.returncode try: self.rpc = get_rpc_proxy(rpc_url(self.datadir, self.index, self.rpchost), self.index, timeout=self.rpc_timeout, coveragedir=self.coverage_dir) self.rpc.getblockcount() # If the call to getblockcount() succeeds then the RPC connection is up self.rpc_connected = True self.url = self.rpc.url self.log.debug("RPC successfully started") return except IOError as e: if e.errno != errno.ECONNREFUSED: # Port not yet open? raise # unknown IO error except JSONRPCException as e: # Initialization phase if e.error['code'] != -28: # RPC in warmup? raise # unknown JSON RPC exception except ValueError as e: # cookie file not found and no rpcuser or rpcassword. bitcoind still starting if "No RPC credentials" not in str(e): raise time.sleep(1.0 / poll_per_s) raise AssertionError("Unable to connect to litecoind") def get_wallet_rpc(self, wallet_name): if self.use_cli: return self.cli("-rpcwallet={}".format(wallet_name)) else: assert self.rpc_connected assert self.rpc wallet_path = "wallet/%s" % wallet_name return self.rpc / wallet_path def stop_node(self): """Stop the node.""" if not self.running: return self.log.debug("Stopping node") try: self.stop() except http.client.CannotSendRequest: self.log.exception("Unable to stop node.") del self.p2ps[:] def is_node_stopped(self): """Checks whether the node has stopped. Returns True if the node has stopped. False otherwise. This method is responsible for freeing resources (self.process).""" if not self.running: return True return_code = self.process.poll() if return_code is None: return False # process has stopped. Assert that it didn't return an error code. assert_equal(return_code, 0) self.running = False self.process = None self.rpc_connected = False self.rpc = None self.log.debug("Node stopped") return True def wait_until_stopped(self, timeout=BITCOIND_PROC_WAIT_TIMEOUT): wait_until(self.is_node_stopped, timeout=timeout) def node_encrypt_wallet(self, passphrase): """"Encrypts the wallet. This causes bitcoind to shutdown, so this method takes care of cleaning up resources.""" self.encryptwallet(passphrase) self.wait_until_stopped() def add_p2p_connection(self, p2p_conn, *args, **kwargs): """Add a p2p connection to the node. This method adds the p2p connection to the self.p2ps list and also returns the connection to the caller.""" if 'dstport' not in kwargs: kwargs['dstport'] = p2p_port(self.index) if 'dstaddr' not in kwargs: kwargs['dstaddr'] = '127.0.0.1' p2p_conn.peer_connect(*args, **kwargs) self.p2ps.append(p2p_conn) return p2p_conn @property def p2p(self): """Return the first p2p connection Convenience property - most tests only use a single p2p connection to each node, so this saves having to write node.p2ps[0] many times.""" assert self.p2ps, "No p2p connection" return self.p2ps[0] def disconnect_p2ps(self): """Close all p2p connections to the node.""" for p in self.p2ps: p.peer_disconnect() del self.p2ps[:] class TestNodeCLIAttr: def __init__(self, cli, command): self.cli = cli self.command = command def __call__(self, *args, **kwargs): return self.cli.send_cli(self.command, *args, **kwargs) def get_request(self, *args, **kwargs): return lambda: self(*args, **kwargs) class TestNodeCLI(): """Interface to bitcoin-cli for an individual node""" def __init__(self, binary, datadir): self.options = [] self.binary = binary self.datadir = datadir self.input = None self.log = logging.getLogger('TestFramework.bitcoincli') def __call__(self, *options, input=None): # TestNodeCLI is callable with bitcoin-cli command-line options cli = TestNodeCLI(self.binary, self.datadir) cli.options = [str(o) for o in options] cli.input = input return cli def __getattr__(self, command): return TestNodeCLIAttr(self, command) def batch(self, requests): results = [] for request in requests: try: results.append(dict(result=request())) except JSONRPCException as e: results.append(dict(error=e)) return results def send_cli(self, command=None, *args, **kwargs): """Run bitcoin-cli command. Deserializes returned string as python object.""" pos_args = [str(arg) for arg in args] named_args = [str(key) + "=" + str(value) for (key, value) in kwargs.items()] assert not (pos_args and named_args), "Cannot use positional arguments and named arguments in the same bitcoin-cli call" p_args = [self.binary, "-datadir=" + self.datadir] + self.options if named_args: p_args += ["-named"] if command is not None: p_args += [command] p_args += pos_args + named_args self.log.debug("Running litecoin-cli command: %s" % command) process = subprocess.Popen(p_args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True) cli_stdout, cli_stderr = process.communicate(input=self.input) returncode = process.poll() if returncode: match = re.match(r'error code: ([-0-9]+)\nerror message:\n(.*)', cli_stderr) if match: code, message = match.groups() raise JSONRPCException(dict(code=int(code), message=message)) # Ignore cli_stdout, raise with cli_stderr raise subprocess.CalledProcessError(returncode, self.binary, output=cli_stderr) try: return json.loads(cli_stdout, parse_float=decimal.Decimal) except JSONDecodeError: return cli_stdout.rstrip("\n")