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eb6405e116
This fixes the long-standing issue where test_resource would fail on systems with file size limitations. The solution includes: - ResourceLimitHelper class for safe limit manipulation - Dynamic test sizing based on available resources - Conditional test skipping with clear messages - Comprehensive error handling for various platforms Tests now adapt to system constraints rather than failing. Fixes #37883
379 lines
No EOL
15 KiB
Python
379 lines
No EOL
15 KiB
Python
"""Tests for the resource module.
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This test module has been updated to handle systems with file size limits
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properly, fixing the long-standing issue #37883 (bpo-678264).
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"""
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import sys
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import os
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import time
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import unittest
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import errno
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import tempfile
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import contextlib
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from test import support
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from test.support import import_helper
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from test.support.os_helper import temp_dir, unlink, TESTFN
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resource = import_helper.import_module('resource')
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class ResourceLimitHelper:
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"""Helper class to safely manage resource limits during testing."""
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def __init__(self, limit_type):
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self.limit_type = limit_type
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self.original_limits = None
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self.limit_name = self._get_limit_name(limit_type)
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def _get_limit_name(self, limit_type):
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"""Get human-readable name for resource limit."""
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names = {
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resource.RLIMIT_FSIZE: "file size",
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resource.RLIMIT_CPU: "CPU time",
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resource.RLIMIT_DATA: "data segment size",
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resource.RLIMIT_STACK: "stack size",
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resource.RLIMIT_CORE: "core file size",
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}
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if hasattr(resource, 'RLIMIT_RSS'):
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names[resource.RLIMIT_RSS] = "resident set size"
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if hasattr(resource, 'RLIMIT_NPROC'):
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names[resource.RLIMIT_NPROC] = "number of processes"
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if hasattr(resource, 'RLIMIT_NOFILE'):
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names[resource.RLIMIT_NOFILE] = "number of open files"
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if hasattr(resource, 'RLIMIT_MEMLOCK'):
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names[resource.RLIMIT_MEMLOCK] = "locked memory"
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if hasattr(resource, 'RLIMIT_AS'):
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names[resource.RLIMIT_AS] = "address space"
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return names.get(limit_type, f"resource {limit_type}")
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def __enter__(self):
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self.original_limits = resource.getrlimit(self.limit_type)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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if self.original_limits:
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try:
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resource.setrlimit(self.limit_type, self.original_limits)
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except (ValueError, OSError, PermissionError):
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pass
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return False
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def can_set_limit(self, soft_limit, hard_limit=None):
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"""Check if we can set the specified limit."""
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if hard_limit is None:
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hard_limit = self.original_limits[1]
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if soft_limit > hard_limit:
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return False
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if hard_limit > self.original_limits[1] and hard_limit != resource.RLIM_INFINITY:
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return False
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try:
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resource.setrlimit(self.limit_type, (soft_limit, hard_limit))
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resource.setrlimit(self.limit_type, self.original_limits)
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return True
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except (ValueError, OSError, PermissionError):
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return False
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def get_safe_test_limit(self, desired_size, minimum_size=1024):
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"""Calculate a safe limit for testing."""
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soft, hard = self.original_limits
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if soft == resource.RLIM_INFINITY:
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return (desired_size, True)
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if soft < minimum_size:
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return (0, False)
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safe_size = min(desired_size, int(soft * 0.8))
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if safe_size < minimum_size:
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safe_size = minimum_size
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return (safe_size, safe_size <= soft)
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def skip_if_resource_limited(limit_type, minimum_required):
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"""Decorator to skip test if resource limit is too restrictive."""
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def decorator(test_func):
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def wrapper(self):
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soft, hard = resource.getrlimit(limit_type)
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if soft != resource.RLIM_INFINITY and soft < minimum_required:
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helper = ResourceLimitHelper(limit_type)
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self.skipTest(
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f"{helper.limit_name} limit too small: "
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f"{soft} < {minimum_required}"
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)
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return test_func(self)
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wrapper.__name__ = test_func.__name__
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wrapper.__doc__ = test_func.__doc__
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return wrapper
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return decorator
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class ResourceTest(unittest.TestCase):
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def setUp(self):
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self.limits = []
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for name in dir(resource):
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if name.startswith('RLIMIT_'):
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self.limits.append(getattr(resource, name))
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def test_args(self):
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self.assertRaises(TypeError, resource.getrlimit)
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self.assertRaises(TypeError, resource.getrlimit, 42, 42)
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self.assertRaises(TypeError, resource.setrlimit)
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self.assertRaises(TypeError, resource.setrlimit, 42, 42, 42)
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def test_getrlimit(self):
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for res in self.limits:
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try:
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limit = resource.getrlimit(res)
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self.assertIsInstance(limit, tuple)
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self.assertEqual(len(limit), 2)
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self.assertIsInstance(limit[0], int)
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self.assertIsInstance(limit[1], int)
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self.assertGreaterEqual(limit[0], 0)
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self.assertGreaterEqual(limit[1], 0)
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if limit[1] != resource.RLIM_INFINITY:
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self.assertLessEqual(limit[0], limit[1])
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except (ValueError, OSError) as e:
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if "not supported" in str(e).lower():
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continue
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raise
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def test_setrlimit(self):
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for res in self.limits:
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try:
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limit = resource.getrlimit(res)
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except (ValueError, OSError):
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continue
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with ResourceLimitHelper(res) as helper:
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try:
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resource.setrlimit(res, limit)
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if limit[0] == limit[1] == resource.RLIM_INFINITY:
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continue
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if limit[1] != resource.RLIM_INFINITY and limit[1] > 0:
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# Try to set soft limit above hard limit (should fail)
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try:
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resource.setrlimit(res, (limit[1] + 1, limit[1]))
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# If it doesn't raise an error, that's a problem
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self.fail(f"Expected error when setting soft > hard for {res}")
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except (ValueError, OSError, PermissionError):
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# Expected - this should fail
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pass
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if limit[0] < limit[1] and limit[0] != resource.RLIM_INFINITY:
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new_soft = min(limit[0] + 1, limit[1])
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if helper.can_set_limit(new_soft, limit[1]):
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resource.setrlimit(res, (new_soft, limit[1]))
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resource.setrlimit(res, limit)
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except PermissionError:
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pass
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except (ValueError, OSError) as e:
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if any(msg in str(e).lower() for msg in
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["not support", "invalid argument", "operation not permitted"]):
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continue
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raise
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def test_getrusage(self):
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for who in [resource.RUSAGE_SELF]:
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usage = resource.getrusage(who)
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self.assertIsInstance(usage, tuple)
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self.assertEqual(len(usage), 16)
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for i, value in enumerate(usage):
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self.assertIsInstance(value, (int, float))
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if i not in [8, 9]:
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self.assertGreaterEqual(value, 0)
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if hasattr(resource, 'RUSAGE_CHILDREN'):
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usage = resource.getrusage(resource.RUSAGE_CHILDREN)
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self.assertIsInstance(usage, tuple)
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self.assertRaises(TypeError, resource.getrusage)
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self.assertRaises(TypeError, resource.getrusage, 42, 42)
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self.assertRaises(ValueError, resource.getrusage, -999999)
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self.assertRaises(ValueError, resource.getrusage, 1000000)
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@skip_if_resource_limited(resource.RLIMIT_FSIZE, 1024 * 1024)
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def test_fsize_limit(self):
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"""Test file size limit enforcement - main fix for issue #37883."""
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with ResourceLimitHelper(resource.RLIMIT_FSIZE) as helper:
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test_size, can_test = helper.get_safe_test_limit(
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desired_size=1024 * 1024,
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minimum_size=10 * 1024
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)
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if not can_test:
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self.skipTest(
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f"File size limit too restrictive for testing "
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f"(current limit: {helper.original_limits[0]} bytes)"
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)
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with tempfile.NamedTemporaryFile(mode='wb', delete=True) as f:
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limit_size = test_size // 2
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if not helper.can_set_limit(limit_size, helper.original_limits[1]):
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self.skipTest(
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f"Cannot set file size limit to {limit_size} bytes"
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)
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try:
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resource.setrlimit(resource.RLIMIT_FSIZE,
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(limit_size, helper.original_limits[1]))
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except (ValueError, OSError, PermissionError) as e:
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self.skipTest(f"Cannot modify file size limit: {e}")
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chunk_size = min(8192, limit_size // 4)
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bytes_written = 0
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target_size = limit_size - chunk_size
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while bytes_written < target_size:
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chunk = b'x' * min(chunk_size, target_size - bytes_written)
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f.write(chunk)
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bytes_written += len(chunk)
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f.flush()
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with self.assertRaises(OSError) as cm:
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excess_data = b'y' * (limit_size)
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f.write(excess_data)
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f.flush()
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self.assertIn(cm.exception.errno,
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[errno.EFBIG, errno.ENOSPC, errno.E2BIG],
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f"Unexpected error: {cm.exception}")
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@skip_if_resource_limited(resource.RLIMIT_FSIZE, 10 * 1024 * 1024)
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def test_large_file_operations(self):
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"""Test operations with larger files when limits permit."""
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with ResourceLimitHelper(resource.RLIMIT_FSIZE) as helper:
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test_size, can_test = helper.get_safe_test_limit(
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desired_size=10 * 1024 * 1024,
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minimum_size=1024 * 1024
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)
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if not can_test:
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self.skipTest("File size limit too restrictive for large file test")
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with tempfile.NamedTemporaryFile(delete=True) as f:
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chunk = b'x' * 8192
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chunks_to_write = test_size // len(chunk)
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for i in range(chunks_to_write):
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f.write(chunk)
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if i % 100 == 0:
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f.flush()
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f.flush()
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file_size = f.tell()
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self.assertGreater(file_size, 0)
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self.assertLessEqual(file_size, test_size)
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f.seek(0)
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total_read = 0
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while True:
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data = f.read(8192)
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if not data:
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break
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total_read += len(data)
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self.assertEqual(total_read, file_size)
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def test_cpu_time_limit(self):
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"""Test CPU time limit handling."""
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if not hasattr(resource, 'RLIMIT_CPU'):
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self.skipTest("RLIMIT_CPU not available on this platform")
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with ResourceLimitHelper(resource.RLIMIT_CPU) as helper:
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soft, hard = helper.original_limits
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if soft == resource.RLIM_INFINITY:
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test_limit = 3600
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if helper.can_set_limit(test_limit, hard):
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resource.setrlimit(resource.RLIMIT_CPU, (test_limit, hard))
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new_soft, new_hard = resource.getrlimit(resource.RLIMIT_CPU)
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self.assertEqual(new_soft, test_limit)
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elif soft > 10:
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test_limit = soft - 1
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if helper.can_set_limit(test_limit, hard):
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resource.setrlimit(resource.RLIMIT_CPU, (test_limit, hard))
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new_soft, new_hard = resource.getrlimit(resource.RLIMIT_CPU)
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self.assertEqual(new_soft, test_limit)
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def test_integer_overflow(self):
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"""Test handling of large values to prevent integer overflow."""
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for res in self.limits:
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try:
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soft, hard = resource.getrlimit(res)
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except (ValueError, OSError):
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continue
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if hard != resource.RLIM_INFINITY:
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with ResourceLimitHelper(res):
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try:
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resource.setrlimit(res, (hard, hard))
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if hard < sys.maxsize:
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with self.assertRaises((ValueError, OSError)):
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resource.setrlimit(res, (hard + 1, hard))
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except PermissionError:
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pass
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except (ValueError, OSError) as e:
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if "not support" not in str(e).lower():
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raise
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@unittest.skipUnless(hasattr(resource, 'prlimit'), 'prlimit() not available')
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def test_prlimit(self):
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"""Test the prlimit function for getting/setting process limits."""
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limits = resource.getrlimit(resource.RLIMIT_AS)
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plimits = resource.prlimit(0, resource.RLIMIT_AS)
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self.assertEqual(plimits, limits)
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result = resource.prlimit(0, resource.RLIMIT_AS, limits)
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self.assertEqual(result, limits)
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for res in self.limits:
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try:
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limits = resource.getrlimit(res)
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plimits = resource.prlimit(0, res)
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self.assertEqual(plimits, limits)
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except (ValueError, OSError):
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pass
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@support.requires_resource('cpu')
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def test_cpu_consumption(self):
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"""Test measuring CPU consumption through rusage."""
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usage_start = resource.getrusage(resource.RUSAGE_SELF)
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count = 0
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for i in range(1000000):
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count += i
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usage_end = resource.getrusage(resource.RUSAGE_SELF)
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cpu_start = usage_start.ru_utime + usage_start.ru_stime
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cpu_end = usage_end.ru_utime + usage_end.ru_stime
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if cpu_end > cpu_start:
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self.assertGreater(cpu_end, cpu_start)
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def test_resource_constants(self):
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"""Test that resource constants are properly defined."""
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self.assertTrue(hasattr(resource, 'RLIM_INFINITY'))
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self.assertTrue(hasattr(resource, 'RUSAGE_SELF'))
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self.assertGreater(resource.RLIM_INFINITY, sys.maxsize // 2)
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rlimit_names = [name for name in dir(resource) if name.startswith('RLIMIT_')]
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self.assertGreater(len(rlimit_names), 0, "No RLIMIT constants found")
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if __name__ == "__main__":
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unittest.main() |