From: Daira Hopwood Date: Tue, 27 Oct 2015 14:47:11 +0000 (+0000) Subject: Improve all of the Windows-specific error reporting. X-Git-Url: https://git.rkrishnan.org/(%5B%5E?a=commitdiff_plain;h=390df98160e5f2d3bd048277e1da5760ad9899f9;p=tahoe-lafs%2Ftahoe-lafs.git Improve all of the Windows-specific error reporting. Also make the Windows function declarations more readable and consistent. Signed-off-by: Daira Hopwood --- diff --git a/src/allmydata/util/fileutil.py b/src/allmydata/util/fileutil.py index 7171bb45..857d3ebc 100644 --- a/src/allmydata/util/fileutil.py +++ b/src/allmydata/util/fileutil.py @@ -7,9 +7,9 @@ from collections import namedtuple from errno import ENOENT if sys.platform == "win32": - from ctypes import WINFUNCTYPE, windll, POINTER, byref, c_ulonglong, create_unicode_buffer - from ctypes.wintypes import BOOL, HANDLE, DWORD, LPCWSTR, LPWSTR, LPVOID, WinError, get_last_error - + from ctypes import WINFUNCTYPE, WinError, windll, POINTER, byref, c_ulonglong, \ + create_unicode_buffer, get_last_error + from ctypes.wintypes import BOOL, HANDLE, DWORD, LPCWSTR, LPWSTR, LPVOID from twisted.python import log @@ -345,10 +345,9 @@ have_GetDiskFreeSpaceExW = False if sys.platform == "win32": # GetEnvironmentVariableW = WINFUNCTYPE( - DWORD, - LPCWSTR, LPWSTR, DWORD, + DWORD, LPCWSTR, LPWSTR, DWORD, use_last_error=True - )(("GetEnvironmentVariableW", windll.kernel32)) + )(("GetEnvironmentVariableW", windll.kernel32)) try: # @@ -356,10 +355,9 @@ if sys.platform == "win32": # GetDiskFreeSpaceExW = WINFUNCTYPE( - BOOL, - LPCWSTR, PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER, + BOOL, LPCWSTR, PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER, use_last_error=True - )(("GetDiskFreeSpaceExW", windll.kernel32)) + )(("GetDiskFreeSpaceExW", windll.kernel32)) have_GetDiskFreeSpaceExW = True except Exception: @@ -407,8 +405,8 @@ def windows_getenv(name): err = get_last_error() if err == ERROR_ENVVAR_NOT_FOUND: return None - raise OSError("Windows error %d attempting to read size of environment variable %r" - % (err, name)) + raise OSError("WinError: %s\n attempting to read size of environment variable %r" + % (WinError(err), name)) if n == 1: # Avoid an ambiguity between a zero-length string and an error in the return value of the # call to GetEnvironmentVariableW below. @@ -420,8 +418,8 @@ def windows_getenv(name): err = get_last_error() if err == ERROR_ENVVAR_NOT_FOUND: return None - raise OSError("Windows error %d attempting to read environment variable %r" - % (err, name)) + raise OSError("WinError: %s\n attempting to read environment variable %r" + % (WinError(err), name)) if retval >= n: raise OSError("Unexpected result %d (expected less than %d) from GetEnvironmentVariableW attempting to read environment variable %r" % (retval, n, name)) @@ -463,8 +461,8 @@ def get_disk_stats(whichdir, reserved_space=0): byref(n_total), byref(n_free_for_root)) if retval == 0: - raise OSError("Windows error %d attempting to get disk statistics for %r" - % (get_last_error(), whichdir)) + raise OSError("WinError: %s\n attempting to get disk statistics for %r" + % (WinError(get_last_error()), whichdir)) free_for_nonroot = n_free_for_nonroot.value total = n_total.value free_for_root = n_free_for_root.value @@ -523,8 +521,10 @@ def get_available_space(whichdir, reserved_space): if sys.platform == "win32": # - CreateFileW = WINFUNCTYPE(HANDLE, LPCWSTR, DWORD, DWORD, LPVOID, DWORD, DWORD, HANDLE) \ - (("CreateFileW", windll.kernel32)) + CreateFileW = WINFUNCTYPE( + HANDLE, LPCWSTR, DWORD, DWORD, LPVOID, DWORD, DWORD, HANDLE, + use_last_error=True + )(("CreateFileW", windll.kernel32)) GENERIC_WRITE = 0x40000000 FILE_SHARE_READ = 0x00000001 @@ -533,10 +533,16 @@ if sys.platform == "win32": INVALID_HANDLE_VALUE = 0xFFFFFFFF # - FlushFileBuffers = WINFUNCTYPE(BOOL, HANDLE)(("FlushFileBuffers", windll.kernel32)) + FlushFileBuffers = WINFUNCTYPE( + BOOL, HANDLE, + use_last_error=True + )(("FlushFileBuffers", windll.kernel32)) # - CloseHandle = WINFUNCTYPE(BOOL, HANDLE)(("CloseHandle", windll.kernel32)) + CloseHandle = WINFUNCTYPE( + BOOL, HANDLE, + use_last_error=True + )(("CloseHandle", windll.kernel32)) # def flush_volume(path): @@ -551,10 +557,10 @@ if sys.platform == "win32": None ) if hVolume == INVALID_HANDLE_VALUE: - raise WinError() + raise WinError(get_last_error()) if FlushFileBuffers(hVolume) == 0: - raise WinError() + raise WinError(get_last_error()) CloseHandle(hVolume) else: @@ -577,10 +583,9 @@ def reraise(wrapper): if sys.platform == "win32": # ReplaceFileW = WINFUNCTYPE( - BOOL, - LPCWSTR, LPCWSTR, LPCWSTR, DWORD, LPVOID, LPVOID, + BOOL, LPCWSTR, LPCWSTR, LPCWSTR, DWORD, LPVOID, LPVOID, use_last_error=True - )(("ReplaceFileW", windll.kernel32)) + )(("ReplaceFileW", windll.kernel32)) REPLACEFILE_IGNORE_MERGE_ERRORS = 0x00000002 diff --git a/src/allmydata/windows/fixups.py b/src/allmydata/windows/fixups.py index eaf5d5eb..490e0850 100644 --- a/src/allmydata/windows/fixups.py +++ b/src/allmydata/windows/fixups.py @@ -9,13 +9,18 @@ def initialize(): done = True import codecs, re - from ctypes import WINFUNCTYPE, windll, POINTER, byref, c_int + from ctypes import WINFUNCTYPE, WinError, windll, POINTER, byref, c_int, get_last_error from ctypes.wintypes import BOOL, HANDLE, DWORD, UINT, LPWSTR, LPCWSTR, LPVOID + from allmydata.util import log from allmydata.util.encodingutil import canonical_encoding # - SetErrorMode = WINFUNCTYPE(UINT, UINT)(("SetErrorMode", windll.kernel32)) + SetErrorMode = WINFUNCTYPE( + UINT, UINT, + use_last_error=True + )(("SetErrorMode", windll.kernel32)) + SEM_FAILCRITICALERRORS = 0x0001 SEM_NOOPENFILEERRORBOX = 0x8000 @@ -50,13 +55,27 @@ def initialize(): # # BOOL WINAPI GetConsoleMode(HANDLE hConsole, LPDWORD lpMode); - GetStdHandle = WINFUNCTYPE(HANDLE, DWORD)(("GetStdHandle", windll.kernel32)) + GetStdHandle = WINFUNCTYPE( + HANDLE, DWORD, + use_last_error=True + )(("GetStdHandle", windll.kernel32)) + STD_OUTPUT_HANDLE = DWORD(-11) STD_ERROR_HANDLE = DWORD(-12) - GetFileType = WINFUNCTYPE(DWORD, DWORD)(("GetFileType", windll.kernel32)) + + GetFileType = WINFUNCTYPE( + DWORD, DWORD, + use_last_error=True + )(("GetFileType", windll.kernel32)) + FILE_TYPE_CHAR = 0x0002 FILE_TYPE_REMOTE = 0x8000 - GetConsoleMode = WINFUNCTYPE(BOOL, HANDLE, POINTER(DWORD))(("GetConsoleMode", windll.kernel32)) + + GetConsoleMode = WINFUNCTYPE( + BOOL, HANDLE, POINTER(DWORD), + use_last_error=True + )(("GetConsoleMode", windll.kernel32)) + INVALID_HANDLE_VALUE = DWORD(-1).value def not_a_console(handle): @@ -88,11 +107,14 @@ def initialize(): real_stderr = False if real_stdout or real_stderr: + # # BOOL WINAPI WriteConsoleW(HANDLE hOutput, LPWSTR lpBuffer, DWORD nChars, # LPDWORD lpCharsWritten, LPVOID lpReserved); - WriteConsoleW = WINFUNCTYPE(BOOL, HANDLE, LPWSTR, DWORD, POINTER(DWORD), LPVOID) \ - (("WriteConsoleW", windll.kernel32)) + WriteConsoleW = WINFUNCTYPE( + BOOL, HANDLE, LPWSTR, DWORD, POINTER(DWORD), LPVOID, + use_last_error=True + )(("WriteConsoleW", windll.kernel32)) class UnicodeOutput: def __init__(self, hConsole, stream, fileno, name): @@ -139,8 +161,10 @@ def initialize(): # There is a shorter-than-documented limitation on the length of the string # passed to WriteConsoleW (see #1232). retval = WriteConsoleW(self._hConsole, text, min(remaining, 10000), byref(n), None) - if retval == 0 or n.value == 0: - raise IOError("WriteConsoleW returned %r, n.value = %r" % (retval, n.value)) + if retval == 0: + raise IOError("WriteConsoleW failed with WinError: %s" % (WinError(get_last_error()),)) + if n.value == 0: + raise IOError("WriteConsoleW returned %r, n.value = 0" % (retval,)) remaining -= n.value if remaining == 0: break text = text[n.value:] @@ -169,12 +193,23 @@ def initialize(): _complain("exception %r while fixing up sys.stdout and sys.stderr" % (e,)) # This works around . - GetCommandLineW = WINFUNCTYPE(LPWSTR)(("GetCommandLineW", windll.kernel32)) - CommandLineToArgvW = WINFUNCTYPE(POINTER(LPWSTR), LPCWSTR, POINTER(c_int)) \ - (("CommandLineToArgvW", windll.shell32)) + + # + GetCommandLineW = WINFUNCTYPE( + LPWSTR, + use_last_error=True + )(("GetCommandLineW", windll.kernel32)) + + # + CommandLineToArgvW = WINFUNCTYPE( + POINTER(LPWSTR), LPCWSTR, POINTER(c_int), + use_last_error=True + )(("CommandLineToArgvW", windll.shell32)) argc = c_int(0) argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc)) + if argv_unicode is None: + raise WinError(get_last_error()) # Because of (and similar limitations in # twisted), the 'bin/tahoe' script cannot invoke us with the actual Unicode arguments. diff --git a/src/allmydata/windows/inotify.py b/src/allmydata/windows/inotify.py index 1a719f9a..c5099ca4 100644 --- a/src/allmydata/windows/inotify.py +++ b/src/allmydata/windows/inotify.py @@ -23,15 +23,18 @@ from allmydata.util.encodingutil import quote_output from allmydata.util import log, fileutil from allmydata.util.pollmixin import PollMixin -from ctypes import WINFUNCTYPE, WinError, windll, POINTER, byref, create_string_buffer, addressof +from ctypes import WINFUNCTYPE, WinError, windll, POINTER, byref, create_string_buffer, \ + addressof, get_last_error from ctypes.wintypes import BOOL, HANDLE, DWORD, LPCWSTR, LPVOID # FILE_LIST_DIRECTORY = 1 # -CreateFileW = WINFUNCTYPE(HANDLE, LPCWSTR, DWORD, DWORD, LPVOID, DWORD, DWORD, HANDLE) \ - (("CreateFileW", windll.kernel32)) +CreateFileW = WINFUNCTYPE( + HANDLE, LPCWSTR, DWORD, DWORD, LPVOID, DWORD, DWORD, HANDLE, + use_last_error=True +)(("CreateFileW", windll.kernel32)) FILE_SHARE_READ = 0x00000001 FILE_SHARE_WRITE = 0x00000002 @@ -42,11 +45,16 @@ OPEN_EXISTING = 3 FILE_FLAG_BACKUP_SEMANTICS = 0x02000000 # -CloseHandle = WINFUNCTYPE(BOOL, HANDLE)(("CloseHandle", windll.kernel32)) +CloseHandle = WINFUNCTYPE( + BOOL, HANDLE, + use_last_error=True +)(("CloseHandle", windll.kernel32)) # -ReadDirectoryChangesW = WINFUNCTYPE(BOOL, HANDLE, LPVOID, DWORD, BOOL, DWORD, POINTER(DWORD), LPVOID, LPVOID) \ - (("ReadDirectoryChangesW", windll.kernel32)) +ReadDirectoryChangesW = WINFUNCTYPE( + BOOL, HANDLE, LPVOID, DWORD, BOOL, DWORD, POINTER(DWORD), LPVOID, LPVOID, + use_last_error=True +)(("ReadDirectoryChangesW", windll.kernel32)) FILE_NOTIFY_CHANGE_FILE_NAME = 0x00000001 FILE_NOTIFY_CHANGE_DIR_NAME = 0x00000002 @@ -121,7 +129,7 @@ class FileNotifyInformation(object): None # NULL -> no completion routine ) if r == 0: - raise WinError() + raise WinError(get_last_error()) self.data = self.buffer.raw[:bytes_returned.value] def __iter__(self): @@ -157,8 +165,8 @@ def _open_directory(path_u): None # no template file ) if hDirectory == INVALID_HANDLE_VALUE: - e = WinError() - raise OSError("Opening directory %s gave Windows error %r: %s" % (quote_output(path_u), e.args[0], e.args[1])) + e = WinError(get_last_error()) + raise OSError("Opening directory %s gave WinError: %s" % (quote_output(path_u), e)) return hDirectory