#!/usr/bin/env python3 # Copyright (c) 2019 Egor Tensin # This file is part of the "math-server" project. # For details, see https://github.com/egor-tensin/math-server. # Distributed under the MIT License. '''This is a stupid script to feed the server with somewhat random arithmetic expressions. ''' import argparse from contextlib import contextmanager import logging import math from multiprocessing import Pool import random import subprocess from subprocess import PIPE import sys from timeit import default_timer class Client: DEFAULT_PATH = 'math-client' DEFAULT_HOST = 'localhost' DEFAULT_PORT = 18000 def __init__(self, path=None, host=None, port=None): if path is None: path = Client.DEFAULT_PATH if host is None: host = Client.DEFAULT_HOST if port is None: port = Client.DEFAULT_PORT self._path = path self._host = host self._port = port def get_command_line(self): return [self._path, '--host', self._host, '--port', str(self._port)] @contextmanager def timer(description): start = default_timer() try: yield finally: duration = default_timer() - start logging.info('%s: %s', description, duration) class Expr: def __init__(self, impl): self._impl = impl def __str__(self): return self._impl def eval(self): try: return eval(self._impl) except Exception: logging.error("Couldn't evaluate expression: %s", self._impl) raise class ExprGen: _OPERATORS = '+', '-', '*', '/' _MIN_NUMOF_OPERATORS = 10 _MAX_NUMOF_OPERATORS = 1000 _MIN_NUMBER = -10e10 _MAX_NUMBER = 10e10 @staticmethod def _random_operator(): return ExprGen._OPERATORS[random.randrange(len(ExprGen._OPERATORS))] @staticmethod def _random_number(): return random.randint(ExprGen._MIN_NUMBER, ExprGen._MAX_NUMBER) @staticmethod def gen_expression(): numof_operators = random.randrange(ExprGen._MIN_NUMOF_OPERATORS, ExprGen._MAX_NUMOF_OPERATORS + 1) expr = '' for _ in range(numof_operators): expr += f"{ExprGen._random_number()} {ExprGen._random_operator()} " expr += str(ExprGen._random_number()) return Expr(expr) class Input: def __init__(self, expr_lst): self._expr_lst = expr_lst @staticmethod def generate(n): if n < 1: raise ValueError('input length must be positive') return Input([ExprGen.gen_expression() for i in range(n)]) def stdin(self): return '\n'.join(map(str, self._expr_lst)) + '\n' def expected_output(self): return [expr.eval() for expr in self._expr_lst] def _float_lists_equal(xs, ys): if len(xs) != len(ys): return False for i in range(len(xs)): if not math.isclose(xs[i], ys[i]): return False return True class Output: def __init__(self, stdout): self._stdout = stdout def __eq__(self, other): return self._stdout == other._stdout def __str__(self): return self._stdout def parse(self): values = [] for line in self._stdout.split('\n')[:-1]: try: n = float(line) except ValueError: logging.error('Not a number: %s', line) raise values.append(n) return values def equal_to_expected(self, expected): this = self.parse() if not _float_lists_equal(this, expected): logging.error("Actual output doesn't match expected output") logging.error('Expected output (length %d):\n%s', len(expected), expected) logging.error('Actual output (length %d):\n%s', len(this), this) return False return True def _run_client(client, stdin): with _logging(): cmd = client.get_command_line() with timer('Client invocation'): result = subprocess.run(cmd, stdout=PIPE, stderr=PIPE, input=stdin, text=True, check=True) return Output(result.stdout) def _run_clients(numof_clients, client, stdin): with Pool(numof_clients) as pool: results = pool.starmap(_run_client, [(client, stdin) for _ in range(numof_clients)]) if len(results) != numof_clients: raise RuntimeError(f'expected {numof_clients} results, got {len(results)}') return results def _run_stress_test(args): client = Client(args.client, args.host, args.port) input = Input.generate(args.numof_expressions) stdin = input.stdin() expected_output = input.expected_output() actual_outputs = _run_clients(args.numof_processes, client, stdin) # Check that all outputs are equal to each other: assert actual_outputs actual_output, rest = actual_outputs[0], actual_outputs[1:] for other in rest: if actual_output == other: continue logging.error("Client outputs don't match, this should never happen") logging.error('For example, this:\n%s', actual_output) logging.error('... is not equal to this:\n%s', other) return False # Check that the first output is equal to the expected output: return actual_output.equal_to_expected(expected_output) def _parse_positive_int(s): try: n = int(s) except ValueError: raise argparse.ArgumentTypeError(f'must be a positive integer: {s}') if n < 1: raise argparse.ArgumentTypeError(f'must be a positive integer: {s}') return n def _parse_args(argv=None): if argv is None: argv = sys.argv[1:] parser = argparse.ArgumentParser( description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter) parser.add_argument('--host', '-H', metavar='HOST', default=Client.DEFAULT_HOST, help='server host') parser.add_argument('--port', '-p', metavar='PORT', type=int, default=Client.DEFAULT_PORT, help='server port') parser.add_argument('--processes', '-n', metavar='N', dest='numof_processes', type=_parse_positive_int, default=1, help='number of processes') parser.add_argument('--expressions', '-e', metavar='N', dest='numof_expressions', type=_parse_positive_int, default=1, help='number of expressions') parser.add_argument('--client', '-c', metavar='PATH', default=Client.DEFAULT_PATH, help='path to the client executable') return parser.parse_args(argv) @contextmanager def _logging(): logging.basicConfig( format='%(asctime)s | %(levelname)s | %(message)s', level=logging.DEBUG) try: yield except Exception as e: logging.exception(e) raise def main(argv=None): with _logging(): args = _parse_args(argv) if not _run_stress_test(args): sys.exit(1) if __name__ == '__main__': main()