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#!/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", "kevacoind")
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", "kevacoin-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("kevacoind 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, "kevacoind 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 kevacoind")
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 kevacoin-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")