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#!/usr/bin/env python3 # -*- coding: utf-8 -*- # Copyright (c) 2009, Giampaolo Rodola'. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. """Notes about unicode handling in psutil ======================================. Starting from version 5.3.0 psutil adds unicode support, see: https://github.com/giampaolo/psutil/issues/1040 The notes below apply to *any* API returning a string such as process exe(), cwd() or username(): * all strings are encoded by using the OS filesystem encoding (sys.getfilesystemencoding()) which varies depending on the platform (e.g. "UTF-8" on macOS, "mbcs" on Win) * no API call is supposed to crash with UnicodeDecodeError * instead, in case of badly encoded data returned by the OS, the following error handlers are used to replace the corrupted characters in the string: * Python 3: sys.getfilesystemencodeerrors() (PY 3.6+) or "surrogatescape" on POSIX and "replace" on Windows * Python 2: "replace" * on Python 2 all APIs return bytes (str type), never unicode * on Python 2, you can go back to unicode by doing: >>> unicode(p.exe(), sys.getdefaultencoding(), errors="replace") For a detailed explanation of how psutil handles unicode see #1040. Tests ===== List of APIs returning or dealing with a string: ('not tested' means they are not tested to deal with non-ASCII strings): * Process.cmdline() * Process.cwd() * Process.environ() * Process.exe() * Process.memory_maps() * Process.name() * Process.net_connections('unix') * Process.open_files() * Process.username() (not tested) * disk_io_counters() (not tested) * disk_partitions() (not tested) * disk_usage(str) * net_connections('unix') * net_if_addrs() (not tested) * net_if_stats() (not tested) * net_io_counters() (not tested) * sensors_fans() (not tested) * sensors_temperatures() (not tested) * users() (not tested) * WindowsService.binpath() (not tested) * WindowsService.description() (not tested) * WindowsService.display_name() (not tested) * WindowsService.name() (not tested) * WindowsService.status() (not tested) * WindowsService.username() (not tested) In here we create a unicode path with a funky non-ASCII name and (where possible) make psutil return it back (e.g. on name(), exe(), open_files(), etc.) and make sure that: * psutil never crashes with UnicodeDecodeError * the returned path matches """ import os import shutil import traceback import warnings from contextlib import closing import psutil from psutil import BSD from psutil import POSIX from psutil import WINDOWS from psutil._compat import PY3 from psutil._compat import super from psutil.tests import APPVEYOR from psutil.tests import ASCII_FS from psutil.tests import CI_TESTING from psutil.tests import HAS_ENVIRON from psutil.tests import HAS_MEMORY_MAPS from psutil.tests import HAS_NET_CONNECTIONS_UNIX from psutil.tests import INVALID_UNICODE_SUFFIX from psutil.tests import PYPY from psutil.tests import TESTFN_PREFIX from psutil.tests import UNICODE_SUFFIX from psutil.tests import PsutilTestCase from psutil.tests import bind_unix_socket from psutil.tests import chdir from psutil.tests import copyload_shared_lib from psutil.tests import create_py_exe from psutil.tests import get_testfn from psutil.tests import pytest from psutil.tests import safe_mkdir from psutil.tests import safe_rmpath from psutil.tests import skip_on_access_denied from psutil.tests import spawn_testproc from psutil.tests import terminate if APPVEYOR: def safe_rmpath(path): # NOQA # TODO - this is quite random and I'm not sure why it happens, # nor I can reproduce it locally: # https://ci.appveyor.com/project/giampaolo/psutil/build/job/ # jiq2cgd6stsbtn60 # safe_rmpath() happens after reap_children() so this is weird # Perhaps wait_procs() on Windows is broken? Maybe because # of STILL_ACTIVE? # https://github.com/giampaolo/psutil/blob/ # 68c7a70728a31d8b8b58f4be6c4c0baa2f449eda/psutil/arch/ # windows/process_info.c#L146 from psutil.tests import safe_rmpath as rm try: return rm(path) except WindowsError: traceback.print_exc() def try_unicode(suffix): """Return True if both the fs and the subprocess module can deal with a unicode file name. """ sproc = None testfn = get_testfn(suffix=suffix) try: safe_rmpath(testfn) create_py_exe(testfn) sproc = spawn_testproc(cmd=[testfn]) shutil.copyfile(testfn, testfn + '-2') safe_rmpath(testfn + '-2') except (UnicodeEncodeError, IOError): return False else: return True finally: if sproc is not None: terminate(sproc) safe_rmpath(testfn) # =================================================================== # FS APIs # =================================================================== class BaseUnicodeTest(PsutilTestCase): funky_suffix = None @classmethod def setUpClass(cls): super().setUpClass() cls.skip_tests = False cls.funky_name = None if cls.funky_suffix is not None: if not try_unicode(cls.funky_suffix): cls.skip_tests = True else: cls.funky_name = get_testfn(suffix=cls.funky_suffix) create_py_exe(cls.funky_name) def setUp(self): super().setUp() if self.skip_tests: raise pytest.skip("can't handle unicode str") @pytest.mark.xdist_group(name="serial") @pytest.mark.skipif(ASCII_FS, reason="ASCII fs") @pytest.mark.skipif(PYPY and not PY3, reason="too much trouble on PYPY2") class TestFSAPIs(BaseUnicodeTest): """Test FS APIs with a funky, valid, UTF8 path name.""" funky_suffix = UNICODE_SUFFIX def expect_exact_path_match(self): # Do not expect psutil to correctly handle unicode paths on # Python 2 if os.listdir() is not able either. here = '.' if isinstance(self.funky_name, str) else u'.' with warnings.catch_warnings(): warnings.simplefilter("ignore") return self.funky_name in os.listdir(here) # --- def test_proc_exe(self): cmd = [ self.funky_name, "-c", "import time; [time.sleep(0.1) for x in range(100)]", ] subp = self.spawn_testproc(cmd) p = psutil.Process(subp.pid) exe = p.exe() assert isinstance(exe, str) if self.expect_exact_path_match(): assert os.path.normcase(exe) == os.path.normcase(self.funky_name) def test_proc_name(self): cmd = [ self.funky_name, "-c", "import time; [time.sleep(0.1) for x in range(100)]", ] subp = self.spawn_testproc(cmd) name = psutil.Process(subp.pid).name() assert isinstance(name, str) if self.expect_exact_path_match(): assert name == os.path.basename(self.funky_name) def test_proc_cmdline(self): cmd = [ self.funky_name, "-c", "import time; [time.sleep(0.1) for x in range(100)]", ] subp = self.spawn_testproc(cmd) p = psutil.Process(subp.pid) cmdline = p.cmdline() for part in cmdline: assert isinstance(part, str) if self.expect_exact_path_match(): assert cmdline == cmd def test_proc_cwd(self): dname = self.funky_name + "2" self.addCleanup(safe_rmpath, dname) safe_mkdir(dname) with chdir(dname): p = psutil.Process() cwd = p.cwd() assert isinstance(p.cwd(), str) if self.expect_exact_path_match(): assert cwd == dname @pytest.mark.skipif(PYPY and WINDOWS, reason="fails on PYPY + WINDOWS") def test_proc_open_files(self): p = psutil.Process() start = set(p.open_files()) with open(self.funky_name, 'rb'): new = set(p.open_files()) path = (new - start).pop().path assert isinstance(path, str) if BSD and not path: # XXX - see https://github.com/giampaolo/psutil/issues/595 raise pytest.skip("open_files on BSD is broken") if self.expect_exact_path_match(): assert os.path.normcase(path) == os.path.normcase(self.funky_name) @pytest.mark.skipif(not POSIX, reason="POSIX only") def test_proc_net_connections(self): name = self.get_testfn(suffix=self.funky_suffix) try: sock = bind_unix_socket(name) except UnicodeEncodeError: if PY3: raise else: raise pytest.skip("not supported") with closing(sock): conn = psutil.Process().net_connections('unix')[0] assert isinstance(conn.laddr, str) assert conn.laddr == name @pytest.mark.skipif(not POSIX, reason="POSIX only") @pytest.mark.skipif( not HAS_NET_CONNECTIONS_UNIX, reason="can't list UNIX sockets" ) @skip_on_access_denied() def test_net_connections(self): def find_sock(cons): for conn in cons: if os.path.basename(conn.laddr).startswith(TESTFN_PREFIX): return conn raise ValueError("connection not found") name = self.get_testfn(suffix=self.funky_suffix) try: sock = bind_unix_socket(name) except UnicodeEncodeError: if PY3: raise else: raise pytest.skip("not supported") with closing(sock): cons = psutil.net_connections(kind='unix') conn = find_sock(cons) assert isinstance(conn.laddr, str) assert conn.laddr == name def test_disk_usage(self): dname = self.funky_name + "2" self.addCleanup(safe_rmpath, dname) safe_mkdir(dname) psutil.disk_usage(dname) @pytest.mark.skipif(not HAS_MEMORY_MAPS, reason="not supported") @pytest.mark.skipif( not PY3, reason="ctypes does not support unicode on PY2" ) @pytest.mark.skipif(PYPY, reason="unstable on PYPY") def test_memory_maps(self): # XXX: on Python 2, using ctypes.CDLL with a unicode path # opens a message box which blocks the test run. with copyload_shared_lib(suffix=self.funky_suffix) as funky_path: def normpath(p): return os.path.realpath(os.path.normcase(p)) libpaths = [ normpath(x.path) for x in psutil.Process().memory_maps() ] # ...just to have a clearer msg in case of failure libpaths = [x for x in libpaths if TESTFN_PREFIX in x] assert normpath(funky_path) in libpaths for path in libpaths: assert isinstance(path, str) @pytest.mark.skipif(CI_TESTING, reason="unreliable on CI") class TestFSAPIsWithInvalidPath(TestFSAPIs): """Test FS APIs with a funky, invalid path name.""" funky_suffix = INVALID_UNICODE_SUFFIX def expect_exact_path_match(self): # Invalid unicode names are supposed to work on Python 2. return True # =================================================================== # Non fs APIs # =================================================================== class TestNonFSAPIS(BaseUnicodeTest): """Unicode tests for non fs-related APIs.""" funky_suffix = UNICODE_SUFFIX if PY3 else 'è' @pytest.mark.skipif(not HAS_ENVIRON, reason="not supported") @pytest.mark.skipif(PYPY and WINDOWS, reason="segfaults on PYPY + WINDOWS") def test_proc_environ(self): # Note: differently from others, this test does not deal # with fs paths. On Python 2 subprocess module is broken as # it's not able to handle with non-ASCII env vars, so # we use "è", which is part of the extended ASCII table # (unicode point <= 255). env = os.environ.copy() env['FUNNY_ARG'] = self.funky_suffix sproc = self.spawn_testproc(env=env) p = psutil.Process(sproc.pid) env = p.environ() for k, v in env.items(): assert isinstance(k, str) assert isinstance(v, str) assert env['FUNNY_ARG'] == self.funky_suffix
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