text: #!/usr/bin/env python3
  # Copyright (c) 2014-2018 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Base class for RPC testing."""
  
  import configparser
  from enum import Enum
  import logging
  import argparse
  import os
  import pdb
  import shutil
  import sys
  import tempfile
  import time
  
  from .authproxy import JSONRPCException
  from . import coverage
  from .test_node import TestNode
  from .mininode import NetworkThread
  from .util import (
      MAX_NODES,
      PortSeed,
      assert_equal,
      check_json_precision,
      connect_nodes_bi,
      disconnect_nodes,
      get_datadir_path,
      initialize_datadir,
      p2p_port,
      sync_blocks,
      sync_mempools,
  )
  
  
  class TestStatus(Enum):
      PASSED = 1
      FAILED = 2
      SKIPPED = 3
  
  TEST_EXIT_PASSED = 0
  TEST_EXIT_FAILED = 1
  TEST_EXIT_SKIPPED = 77
  
  TMPDIR_PREFIX = "gothcoin_func_test_"
  
  
  class SkipTest(Exception):
      """This exception is raised to skip a test"""
  
      def __init__(self, message):
          self.message = message
  
  
  class BitcoinTestMetaClass(type):
      """Metaclass for BitcoinTestFramework.
  
      Ensures that any attempt to register a subclass of `BitcoinTestFramework`
      adheres to a standard whereby the subclass overrides `set_test_params` and
      `run_test` but DOES NOT override either `__init__` or `main`. If any of
      those standards are violated, a ``TypeError`` is raised."""
  
      def __new__(cls, clsname, bases, dct):
          if not clsname == 'BitcoinTestFramework':
              if not ('run_test' in dct and 'set_test_params' in dct):
                  raise TypeError("BitcoinTestFramework subclasses must override "
                                  "'run_test' and 'set_test_params'")
              if '__init__' in dct or 'main' in dct:
                  raise TypeError("BitcoinTestFramework subclasses may not override "
                                  "'__init__' or 'main'")
  
          return super().__new__(cls, clsname, bases, dct)
  
  
  class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
      """Base class for a gothcoin test script.
  
      Individual gothcoin test scripts should subclass this class and override the set_test_params() and run_test() methods.
  
      Individual tests can also override the following methods to customize the test setup:
  
      - add_options()
      - setup_chain()
      - setup_network()
      - setup_nodes()
  
      The __init__() and main() methods should not be overridden.
  
      This class also contains various public and private helper methods."""
  
      def __init__(self):
          """Sets test framework defaults. Do not override this method. Instead, override the set_test_params() method"""
          self.setup_clean_chain = False
          self.nodes = []
          self.network_thread = None
          self.rpc_timeout = 60  # Wait for up to 60 seconds for the RPC server to respond
          self.supports_cli = False
          self.bind_to_localhost_only = True
          self.set_test_params()
  
          assert hasattr(self, "num_nodes"), "Test must set self.num_nodes in set_test_params()"
  
      def main(self):
          """Main function. This should not be overridden by the subclass test scripts."""
  
          parser = argparse.ArgumentParser(usage="%(prog)s [options]")
          parser.add_argument("--nocleanup", dest="nocleanup", default=False, action="store_true",
                              help="Leave gothcoinds and test.* datadir on exit or error")
          parser.add_argument("--noshutdown", dest="noshutdown", default=False, action="store_true",
                              help="Don't stop gothcoinds after the test execution")
          parser.add_argument("--cachedir", dest="cachedir", default=os.path.abspath(os.path.dirname(os.path.realpath(__file__)) + "/../../cache"),
                              help="Directory for caching pregenerated datadirs (default: %(default)s)")
          parser.add_argument("--tmpdir", dest="tmpdir", help="Root directory for datadirs")
          parser.add_argument("-l", "--loglevel", dest="loglevel", default="INFO",
                              help="log events at this level and higher to the console. Can be set to DEBUG, INFO, WARNING, ERROR or CRITICAL. Passing --loglevel DEBUG will output all logs to console. Note that logs at all levels are always written to the test_framework.log file in the temporary test directory.")
          parser.add_argument("--tracerpc", dest="trace_rpc", default=False, action="store_true",
                              help="Print out all RPC calls as they are made")
          parser.add_argument("--portseed", dest="port_seed", default=os.getpid(), type=int,
                              help="The seed to use for assigning port numbers (default: current process id)")
          parser.add_argument("--coveragedir", dest="coveragedir",
                              help="Write tested RPC commands into this directory")
          parser.add_argument("--configfile", dest="configfile",
                              default=os.path.abspath(os.path.dirname(os.path.realpath(__file__)) + "/../../config.ini"),
                              help="Location of the test framework config file (default: %(default)s)")
          parser.add_argument("--pdbonfailure", dest="pdbonfailure", default=False, action="store_true",
                              help="Attach a python debugger if test fails")
          parser.add_argument("--usecli", dest="usecli", default=False, action="store_true",
                              help="use gothcoin-cli instead of RPC for all commands")
          parser.add_argument("--perf", dest="perf", default=False, action="store_true",
                              help="profile running nodes with perf for the duration of the test")
          self.add_options(parser)
          self.options = parser.parse_args()
  
          PortSeed.n = self.options.port_seed
  
          check_json_precision()
  
          self.options.cachedir = os.path.abspath(self.options.cachedir)
  
          config = configparser.ConfigParser()
          config.read_file(open(self.options.configfile))
          self.config = config
          self.options.bitcoind = os.getenv("GOTHCOIND", default=config["environment"]["BUILDDIR"] + '/src/gothcoind' + config["environment"]["EXEEXT"])
          self.options.bitcoincli = os.getenv("GOTHCOINCLI", default=config["environment"]["BUILDDIR"] + '/src/gothcoin-cli' + config["environment"]["EXEEXT"])
  
          os.environ['PATH'] = os.pathsep.join([
              os.path.join(config['environment']['BUILDDIR'], 'src'),
              os.path.join(config['environment']['BUILDDIR'], 'src', 'qt'),
              os.environ['PATH']
          ])
  
          # Set up temp directory and start logging
          if self.options.tmpdir:
              self.options.tmpdir = os.path.abspath(self.options.tmpdir)
              os.makedirs(self.options.tmpdir, exist_ok=False)
          else:
              self.options.tmpdir = tempfile.mkdtemp(prefix=TMPDIR_PREFIX)
          self._start_logging()
  
          self.log.debug('Setting up network thread')
          self.network_thread = NetworkThread()
          self.network_thread.start()
  
          success = TestStatus.FAILED
  
          try:
              if self.options.usecli:
                  if not self.supports_cli:
                      raise SkipTest("--usecli specified but test does not support using CLI")
                  self.skip_if_no_cli()
              self.skip_test_if_missing_module()
              self.setup_chain()
              self.setup_network()
              self.run_test()
              success = TestStatus.PASSED
          except JSONRPCException as e:
              self.log.exception("JSONRPC error")
          except SkipTest as e:
              self.log.warning("Test Skipped: %s" % e.message)
              success = TestStatus.SKIPPED
          except AssertionError as e:
              self.log.exception("Assertion failed")
          except KeyError as e:
              self.log.exception("Key error")
          except Exception as e:
              self.log.exception("Unexpected exception caught during testing")
          except KeyboardInterrupt as e:
              self.log.warning("Exiting after keyboard interrupt")
  
          if success == TestStatus.FAILED and self.options.pdbonfailure:
              print("Testcase failed. Attaching python debugger. Enter ? for help")
              pdb.set_trace()
  
          self.log.debug('Closing down network thread')
          self.network_thread.close()
          if not self.options.noshutdown:
              self.log.info("Stopping nodes")
              if self.nodes:
                  self.stop_nodes()
          else:
              for node in self.nodes:
                  node.cleanup_on_exit = False
              self.log.info("Note: gothcoinds were not stopped and may still be running")
  
          should_clean_up = (
              not self.options.nocleanup and
              not self.options.noshutdown and
              success != TestStatus.FAILED and
              not self.options.perf
          )
          if should_clean_up:
              self.log.info("Cleaning up {} on exit".format(self.options.tmpdir))
              cleanup_tree_on_exit = True
          elif self.options.perf:
              self.log.warning("Not cleaning up dir {} due to perf data".format(self.options.tmpdir))
              cleanup_tree_on_exit = False
          else:
              self.log.warning("Not cleaning up dir {}".format(self.options.tmpdir))
              cleanup_tree_on_exit = False
  
          if success == TestStatus.PASSED:
              self.log.info("Tests successful")
              exit_code = TEST_EXIT_PASSED
          elif success == TestStatus.SKIPPED:
              self.log.info("Test skipped")
              exit_code = TEST_EXIT_SKIPPED
          else:
              self.log.error("Test failed. Test logging available at %s/test_framework.log", self.options.tmpdir)
              self.log.error("Hint: Call {} '{}' to consolidate all logs".format(os.path.normpath(os.path.dirname(os.path.realpath(__file__)) + "/../combine_logs.py"), self.options.tmpdir))
              exit_code = TEST_EXIT_FAILED
          logging.shutdown()
          if cleanup_tree_on_exit:
              shutil.rmtree(self.options.tmpdir)
          sys.exit(exit_code)
  
      # Methods to override in subclass test scripts.
      def set_test_params(self):
          """Tests must this method to change default values for number of nodes, topology, etc"""
          raise NotImplementedError
  
      def add_options(self, parser):
          """Override this method to add command-line options to the test"""
          pass
  
      def skip_test_if_missing_module(self):
          """Override this method to skip a test if a module is not compiled"""
          pass
  
      def setup_chain(self):
          """Override this method to customize blockchain setup"""
          self.log.info("Initializing test directory " + self.options.tmpdir)
          if self.setup_clean_chain:
              self._initialize_chain_clean()
          else:
              self._initialize_chain()
  
      def setup_network(self):
          """Override this method to customize test network topology"""
          self.setup_nodes()
  
          # Connect the nodes as a "chain".  This allows us
          # to split the network between nodes 1 and 2 to get
          # two halves that can work on competing chains.
          for i in range(self.num_nodes - 1):
              connect_nodes_bi(self.nodes, i, i + 1)
          self.sync_all()
  
      def setup_nodes(self):
          """Override this method to customize test node setup"""
          extra_args = None
          if hasattr(self, "extra_args"):
              extra_args = self.extra_args
          self.add_nodes(self.num_nodes, extra_args)
          self.start_nodes()
          self.import_deterministic_coinbase_privkeys()
          if not self.setup_clean_chain:
              for n in self.nodes:
                  assert_equal(n.getblockchaininfo()["blocks"], 199)
              # To ensure that all nodes are out of IBD, the most recent block
              # must have a timestamp not too old (see IsInitialBlockDownload()).
              self.log.debug('Generate a block with current time')
              block_hash = self.nodes[0].generate(1)[0]
              block = self.nodes[0].getblock(blockhash=block_hash, verbosity=0)
              for n in self.nodes:
                  n.submitblock(block)
                  chain_info = n.getblockchaininfo()
                  assert_equal(chain_info["blocks"], 200)
                  assert_equal(chain_info["initialblockdownload"], False)
  
      def import_deterministic_coinbase_privkeys(self):
          for n in self.nodes:
              try:
                  n.getwalletinfo()
              except JSONRPCException as e:
                  assert str(e).startswith('Method not found')
                  continue
  
              n.importprivkey(privkey=n.get_deterministic_priv_key().key, label='coinbase')
  
      def run_test(self):
          """Tests must override this method to define test logic"""
          raise NotImplementedError
  
      # Public helper methods. These can be accessed by the subclass test scripts.
  
      def add_nodes(self, num_nodes, extra_args=None, *, rpchost=None, binary=None):
          """Instantiate TestNode objects.
  
          Should only be called once after the nodes have been specified in
          set_test_params()."""
          if self.bind_to_localhost_only:
              extra_confs = [["bind=127.0.0.1"]] * num_nodes
          else:
              extra_confs = [[]] * num_nodes
          if extra_args is None:
              extra_args = [[]] * num_nodes
          if binary is None:
              binary = [self.options.bitcoind] * num_nodes
          assert_equal(len(extra_confs), num_nodes)
          assert_equal(len(extra_args), num_nodes)
          assert_equal(len(binary), num_nodes)
          for i in range(num_nodes):
              self.nodes.append(TestNode(
                  i,
                  get_datadir_path(self.options.tmpdir, i),
                  rpchost=rpchost,
                  timewait=self.rpc_timeout,
                  bitcoind=binary[i],
                  bitcoin_cli=self.options.bitcoincli,
                  coverage_dir=self.options.coveragedir,
                  cwd=self.options.tmpdir,
                  extra_conf=extra_confs[i],
                  extra_args=extra_args[i],
                  use_cli=self.options.usecli,
                  start_perf=self.options.perf,
              ))
  
      def start_node(self, i, *args, **kwargs):
          """Start a gothcoind"""
  
          node = self.nodes[i]
  
          node.start(*args, **kwargs)
          node.wait_for_rpc_connection()
  
          if self.options.coveragedir is not None:
              coverage.write_all_rpc_commands(self.options.coveragedir, node.rpc)
  
      def start_nodes(self, extra_args=None, *args, **kwargs):
          """Start multiple gothcoinds"""
  
          if extra_args is None:
              extra_args = [None] * self.num_nodes
          assert_equal(len(extra_args), self.num_nodes)
          try:
              for i, node in enumerate(self.nodes):
                  node.start(extra_args[i], *args, **kwargs)
              for node in self.nodes:
                  node.wait_for_rpc_connection()
          except:
              # If one node failed to start, stop the others
              self.stop_nodes()
              raise
  
          if self.options.coveragedir is not None:
              for node in self.nodes:
                  coverage.write_all_rpc_commands(self.options.coveragedir, node.rpc)
  
      def stop_node(self, i, expected_stderr='', wait=0):
          """Stop a gothcoind test node"""
          self.nodes[i].stop_node(expected_stderr, wait=wait)
          self.nodes[i].wait_until_stopped()
  
      def stop_nodes(self, wait=0):
          """Stop multiple gothcoind test nodes"""
          for node in self.nodes:
              # Issue RPC to stop nodes
              node.stop_node(wait=wait)
  
          for node in self.nodes:
              # Wait for nodes to stop
              node.wait_until_stopped()
  
      def restart_node(self, i, extra_args=None):
          """Stop and start a test node"""
          self.stop_node(i)
          self.start_node(i, extra_args)
  
      def wait_for_node_exit(self, i, timeout):
          self.nodes[i].process.wait(timeout)
  
      def split_network(self):
          """
          Split the network of four nodes into nodes 0/1 and 2/3.
          """
          disconnect_nodes(self.nodes[1], 2)
          disconnect_nodes(self.nodes[2], 1)
          self.sync_all([self.nodes[:2], self.nodes[2:]])
  
      def join_network(self):
          """
          Join the (previously split) network halves together.
          """
          connect_nodes_bi(self.nodes, 1, 2)
          self.sync_all()
  
      def sync_all(self, node_groups=None):
          if not node_groups:
              node_groups = [self.nodes]
  
          for group in node_groups:
              sync_blocks(group)
              sync_mempools(group)
  
      # Private helper methods. These should not be accessed by the subclass test scripts.
  
      def _start_logging(self):
          # Add logger and logging handlers
          self.log = logging.getLogger('TestFramework')
          self.log.setLevel(logging.DEBUG)
          # Create file handler to log all messages
          fh = logging.FileHandler(self.options.tmpdir + '/test_framework.log', encoding='utf-8')
          fh.setLevel(logging.DEBUG)
          # Create console handler to log messages to stderr. By default this logs only error messages, but can be configured with --loglevel.
          ch = logging.StreamHandler(sys.stdout)
          # User can provide log level as a number or string (eg DEBUG). loglevel was caught as a string, so try to convert it to an int
          ll = int(self.options.loglevel) if self.options.loglevel.isdigit() else self.options.loglevel.upper()
          ch.setLevel(ll)
          # Format logs the same as bitcoind's debug.log with microprecision (so log files can be concatenated and sorted)
          formatter = logging.Formatter(fmt='%(asctime)s.%(msecs)03d000Z %(name)s (%(levelname)s): %(message)s', datefmt='%Y-%m-%dT%H:%M:%S')
          formatter.converter = time.gmtime
          fh.setFormatter(formatter)
          ch.setFormatter(formatter)
          # add the handlers to the logger
          self.log.addHandler(fh)
          self.log.addHandler(ch)
  
          if self.options.trace_rpc:
              rpc_logger = logging.getLogger("BitcoinRPC")
              rpc_logger.setLevel(logging.DEBUG)
              rpc_handler = logging.StreamHandler(sys.stdout)
              rpc_handler.setLevel(logging.DEBUG)
              rpc_logger.addHandler(rpc_handler)
  
      def _initialize_chain(self):
          """Initialize a pre-mined blockchain for use by the test.
  
          Create a cache of a 199-block-long chain (with wallet) for MAX_NODES
          Afterward, create num_nodes copies from the cache."""
  
          assert self.num_nodes <= MAX_NODES
          create_cache = False
          for i in range(MAX_NODES):
              if not os.path.isdir(get_datadir_path(self.options.cachedir, i)):
                  create_cache = True
                  break
  
          if create_cache:
              self.log.debug("Creating data directories from cached datadir")
  
              # find and delete old cache directories if any exist
              for i in range(MAX_NODES):
                  if os.path.isdir(get_datadir_path(self.options.cachedir, i)):
                      shutil.rmtree(get_datadir_path(self.options.cachedir, i))
  
              # Create cache directories, run bitcoinds:
              for i in range(MAX_NODES):
                  datadir = initialize_datadir(self.options.cachedir, i)
                  args = [self.options.bitcoind, "-datadir=" + datadir, '-disablewallet']
                  if i > 0:
                      args.append("-connect=127.0.0.1:" + str(p2p_port(0)))
                  self.nodes.append(TestNode(
                      i,
                      get_datadir_path(self.options.cachedir, i),
                      extra_conf=["bind=127.0.0.1"],
                      extra_args=[],
                      rpchost=None,
                      timewait=self.rpc_timeout,
                      bitcoind=self.options.bitcoind,
                      bitcoin_cli=self.options.bitcoincli,
                      coverage_dir=None,
                      cwd=self.options.tmpdir,
                  ))
                  self.nodes[i].args = args
                  self.start_node(i)
  
              # Wait for RPC connections to be ready
              for node in self.nodes:
                  node.wait_for_rpc_connection()
  
              # Create a 199-block-long chain; each of the 4 first nodes
              # gets 25 mature blocks and 25 immature.
              # The 4th node gets only 24 immature blocks so that the very last
              # block in the cache does not age too much (have an old tip age).
              # This is needed so that we are out of IBD when the test starts,
              # see the tip age check in IsInitialBlockDownload().
              for i in range(8):
                  self.nodes[0].generatetoaddress(25 if i != 7 else 24, self.nodes[i % 4].get_deterministic_priv_key().address)
              sync_blocks(self.nodes)
  
              for n in self.nodes:
                  assert_equal(n.getblockchaininfo()["blocks"], 199)
  
              # Shut them down, and clean up cache directories:
              self.stop_nodes()
              self.nodes = []
  
              def cache_path(n, *paths):
                  return os.path.join(get_datadir_path(self.options.cachedir, n), "regtest", *paths)
  
              for i in range(MAX_NODES):
                  os.rmdir(cache_path(i, 'wallets'))  # Remove empty wallets dir
                  for entry in os.listdir(cache_path(i)):
                      if entry not in ['chainstate', 'blocks']:
                          os.remove(cache_path(i, entry))
  
          for i in range(self.num_nodes):
              from_dir = get_datadir_path(self.options.cachedir, i)
              to_dir = get_datadir_path(self.options.tmpdir, i)
              shutil.copytree(from_dir, to_dir)
              initialize_datadir(self.options.tmpdir, i)  # Overwrite port/rpcport in bitcoin.conf
  
      def _initialize_chain_clean(self):
          """Initialize empty blockchain for use by the test.
  
          Create an empty blockchain and num_nodes wallets.
          Useful if a test case wants complete control over initialization."""
          for i in range(self.num_nodes):
              initialize_datadir(self.options.tmpdir, i)
  
      def skip_if_no_py3_zmq(self):
          """Attempt to import the zmq package and skip the test if the import fails."""
          try:
              import zmq  # noqa
          except ImportError:
              raise SkipTest("python3-zmq module not available.")
  
      def skip_if_no_bitcoind_zmq(self):
          """Skip the running test if bitcoind has not been compiled with zmq support."""
          if not self.is_zmq_compiled():
              raise SkipTest("gothcoind has not been built with zmq enabled.")
  
      def skip_if_no_wallet(self):
          """Skip the running test if wallet has not been compiled."""
          if not self.is_wallet_compiled():
              raise SkipTest("wallet has not been compiled.")
  
      def skip_if_no_cli(self):
          """Skip the running test if bitcoin-cli has not been compiled."""
          if not self.is_cli_compiled():
              raise SkipTest("gothcoin-cli has not been compiled.")
  
      def is_cli_compiled(self):
          """Checks whether bitcoin-cli was compiled."""
          config = configparser.ConfigParser()
          config.read_file(open(self.options.configfile))
  
          return config["components"].getboolean("ENABLE_CLI")
  
      def is_wallet_compiled(self):
          """Checks whether the wallet module was compiled."""
          config = configparser.ConfigParser()
          config.read_file(open(self.options.configfile))
  
          return config["components"].getboolean("ENABLE_WALLET")
  
      def is_zmq_compiled(self):
          """Checks whether the zmq module was compiled."""
          config = configparser.ConfigParser()
          config.read_file(open(self.options.configfile))
  
          return config["components"].getboolean("ENABLE_ZMQ")
  