diff options
Diffstat (limited to 'Lib/logging')
| -rw-r--r-- | Lib/logging/__init__.py | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py index 7b790d2..c28d7c8 100644 --- a/Lib/logging/__init__.py +++ b/Lib/logging/__init__.py @@ -46,8 +46,8 @@ except ImportError: __author__ = "Vinay Sajip <vinay_sajip@red-dove.com>" __status__ = "production" -__version__ = "0.5.0.5" -__date__ = "24 January 2008" +__version__ = "0.5.0.6" +__date__ = "03 December 2008" #--------------------------------------------------------------------------- # Miscellaneous module data @@ -1488,3 +1488,58 @@ except ImportError: # for Python versions < 2.0 old_exit(status) sys.exit = exithook + +# Null handler + +class NullHandler(Handler): + """ + This handler does nothing. It's intended to be used to avoid the + "No handlers could be found for logger XXX" one-off warning. This is + important for library code, which may contain code to log events. If a user + of the library does not configure logging, the one-off warning might be + produced; to avoid this, the library developer simply needs to instantiate + a NullHandler and add it to the top-level logger of the library module or + package. + """ + def emit(self, record): + pass + +# Warnings integration + +_warnings_showwarning = None + +def _showwarning(message, category, filename, lineno, file=None, line=None): + """ + Implementation of showwarnings which redirects to logging, which will first + check to see if the file parameter is None. If a file is specified, it will + delegate to the original warnings implementation of showwarning. Otherwise, + it will call warnings.formatwarning and will log the resulting string to a + warnings logger named "py.warnings" with level logging.WARNING. + """ + if file is not None: + if _warnings_showwarning is not None: + _warnings_showwarning(message, category, filename, lineno, file, line) + else: + import warnings + s = warnings.formatwarning(message, category, filename, lineno, line) + logger = getLogger("py.warnings") + if not logger.handlers: + logger.addHandler(NullHandler()) + logger.warning("%s", s) + +def captureWarnings(capture): + """ + If capture is true, redirect all warnings to the logging package. + If capture is False, ensure that warnings are not redirected to logging + but to their original destinations. + """ + import warnings + global _warnings_showwarning + if capture: + if _warnings_showwarning is None: + _warnings_showwarning = warnings.showwarning + warnings.showwarning = _showwarning + else: + if _warnings_showwarning is not None: + warnings.showwarning = _warnings_showwarning + _warnings_showwarning = None |