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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 subprocess
import time
from .util import (
assert_equal,
get_rpc_proxy,
rpc_url,
)
from .authproxy import JSONRPCException
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
To make things easier for the test writer, a bit of magic is happening under the covers.
Any unrecognised messages will be dispatched to the RPC connection."""
def __init__(self, i, dirname, extra_args, rpchost, timewait, binary, stderr, mocktime, coverage_dir):
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("BITCOIND", "bitcoind")
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("BITCOINCLI", "bitcoin-cli"), self.datadir)
self.running = False
self.process = None
self.rpc_connected = False
self.rpc = None
self.url = None
self.log = logging.getLogger('TestFramework.node%d' % i)
def __getattr__(self, *args, **kwargs):
"""Dispatches any unrecognised messages to the RPC connection."""
assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection"
return self.rpc.__getattr__(*args, **kwargs)
def start(self, extra_args=None, stderr=None):
"""Start the node."""
if extra_args is None:
extra_args = self.extra_args
if stderr is None:
stderr = self.stderr
self.process = subprocess.Popen(self.args + extra_args, stderr=stderr)
self.running = True
self.log.debug("bitcoind 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, "bitcoind 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 bitcoind")
def get_wallet_rpc(self, wallet_name):
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.")
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 not None:
# process has stopped. Assert that it didn't return an error code.
assert_equal(return_code, 0)
self.running = False
self.process = None
self.log.debug("Node stopped")
return True
return False
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)
while not self.is_node_stopped():
time.sleep(0.1)
self.rpc = None
self.rpc_connected = False
class TestNodeCLI():
"""Interface to bitcoin-cli for an individual node"""
def __init__(self, binary, datadir):
self.binary = binary
self.datadir = datadir
def __getattr__(self, command):
def dispatcher(*args, **kwargs):
return self.send_cli(command, *args, **kwargs)
return dispatcher
def send_cli(self, command, *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]
if named_args:
p_args += ["-named"]
p_args += [command] + pos_args + named_args
cli_output = subprocess.check_output(p_args, universal_newlines=True)
return json.loads(cli_output, parse_float=decimal.Decimal)
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