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windows/fixups.py: make errors reported to original_stderr have enough information to debug even if we can't see the traceback.

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This commit is contained in:
david-sarah 2010-07-26 15:19:04 -07:00
parent ec6a674a5c
commit b5f052a0d7
1 changed files with 17 additions and 15 deletions
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32
src/allmydata/windows/fixups.py
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@ -9,6 +9,15 @@ def initialize():
done = True
original_stderr = sys.stderr
# If any exception occurs in this code, we'll probably try to print it on stderr,
# which makes for frustrating debugging if stderr is directed to our wrapper.
# So be paranoid about catching errors and reporting them to original_stderr,
# so that we can at least see them.
def _complain(message):
print >>original_stderr, isinstance(message, str) and message or repr(message)
log.msg(message, level=log.WEIRD)
import codecs, re
from ctypes import WINFUNCTYPE, windll, POINTER, byref, c_int
from ctypes.wintypes import BOOL, HANDLE, DWORD, LPWSTR, LPCWSTR, LPVOID
@ -78,11 +87,6 @@ def initialize():
WriteConsoleW = WINFUNCTYPE(BOOL, HANDLE, LPWSTR, DWORD, POINTER(DWORD), LPVOID) \
(("WriteConsoleW", windll.kernel32))
# If any exception occurs in this code, we'll probably try to print it on stderr,
# which makes for frustrating debugging if stderr is directed to this code.
# So be paranoid about catching errors and reporting them to original_stderr,
# so that we can at least see them.
class UnicodeOutput:
def __init__(self, hConsole, stream, fileno, name):
self._hConsole = hConsole
@ -94,7 +98,7 @@ def initialize():
self.encoding = 'utf-8'
self.name = name
if hasattr(stream, 'encoding') and canonical_encoding(stream.encoding) != 'utf-8':
log.msg("%s (%r) had encoding %r, but we're going to write UTF-8 to it" %
log.msg("%s: %r had encoding %r, but we're going to write UTF-8 to it" %
(name, stream, stream.encoding), level=log.CURIOUS)
self.flush()
@ -110,7 +114,7 @@ def initialize():
try:
self._stream.flush()
except Exception, e:
print >>original_stderr, repr(e)
_complain("%s.flush: %r from %r" % (self.name, e, self._stream))
raise
def write(self, text):
@ -127,13 +131,12 @@ def initialize():
n = DWORD(0)
retval = WriteConsoleW(self._hConsole, text, remaining, byref(n), None)
if retval == 0 or n.value == 0:
raise IOError("could not write to %s [WriteConsoleW returned %r, n.value = %r]"
% (self.name, retval, n.value))
raise IOError("WriteConsoleW returned %r, n.value = %r" % (retval, n.value))
remaining -= n.value
if remaining == 0: break
text = text[n.value:]
except Exception, e:
print >>original_stderr, repr(e)
_complain("%s.write: %r" % (self.name, e))
raise
def writelines(self, lines):
@ -141,7 +144,7 @@ def initialize():
for line in lines:
self.write(line)
except Exception, e:
print >>original_stderr, repr(e)
_complain("%s.writelines: %r" % (self.name, e))
raise
if real_stdout:
@ -154,8 +157,7 @@ def initialize():
else:
sys.stderr = UnicodeOutput(None, sys.stderr, old_stderr_fileno, '<Unicode redirected stderr>')
except Exception, e:
print >>original_stderr, "exception %r while fixing up sys.stdout and sys.stderr" % (e,)
log.msg("exception %r while fixing up sys.stdout and sys.stderr" % (e,), log.WEIRD)
_complain("exception %r while fixing up sys.stdout and sys.stderr" % (e,))
# Unmangle command-line arguments.
GetCommandLineW = WINFUNCTYPE(LPWSTR)(("GetCommandLineW", windll.kernel32))
@ -171,8 +173,8 @@ def initialize():
try:
sys.argv = [unmangle(argv_unicode[i]).encode('utf-8') for i in xrange(1, argc.value)]
except Exception, e:
print >>sys.stderr, "%s: could not unmangle Unicode arguments" % (sys.argv[0],)
print >>sys.stderr, [argv_unicode[i] for i in xrange(1, argc.value)]
_complain("%s: could not unmangle Unicode arguments.\n%r"
% (sys.argv[0], [argv_unicode[i] for i in xrange(1, argc.value)]))
raise
if sys.argv[0].endswith('.pyscript'):