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Diffstat (limited to 'Logs.py')
| -rw-r--r-- | Logs.py | 379 |
1 files changed, 379 insertions, 0 deletions
@@ -0,0 +1,379 @@ +#!/usr/bin/env python +# encoding: utf-8 +# Thomas Nagy, 2005-2018 (ita) + +""" +logging, colors, terminal width and pretty-print +""" + +import os, re, traceback, sys +from waflib import Utils, ansiterm + +if not os.environ.get('NOSYNC', False): + # synchronized output is nearly mandatory to prevent garbled output + if sys.stdout.isatty() and id(sys.stdout) == id(sys.__stdout__): + sys.stdout = ansiterm.AnsiTerm(sys.stdout) + if sys.stderr.isatty() and id(sys.stderr) == id(sys.__stderr__): + sys.stderr = ansiterm.AnsiTerm(sys.stderr) + +# import the logging module after since it holds a reference on sys.stderr +# in case someone uses the root logger +import logging + +LOG_FORMAT = os.environ.get('WAF_LOG_FORMAT', '%(asctime)s %(c1)s%(zone)s%(c2)s %(message)s') +HOUR_FORMAT = os.environ.get('WAF_HOUR_FORMAT', '%H:%M:%S') + +zones = [] +""" +See :py:class:`waflib.Logs.log_filter` +""" + +verbose = 0 +""" +Global verbosity level, see :py:func:`waflib.Logs.debug` and :py:func:`waflib.Logs.error` +""" + +colors_lst = { +'USE' : True, +'BOLD' :'\x1b[01;1m', +'RED' :'\x1b[01;31m', +'GREEN' :'\x1b[32m', +'YELLOW':'\x1b[33m', +'PINK' :'\x1b[35m', +'BLUE' :'\x1b[01;34m', +'CYAN' :'\x1b[36m', +'GREY' :'\x1b[37m', +'NORMAL':'\x1b[0m', +'cursor_on' :'\x1b[?25h', +'cursor_off' :'\x1b[?25l', +} + +indicator = '\r\x1b[K%s%s%s' + +try: + unicode +except NameError: + unicode = None + +def enable_colors(use): + """ + If *1* is given, then the system will perform a few verifications + before enabling colors, such as checking whether the interpreter + is running in a terminal. A value of zero will disable colors, + and a value above *1* will force colors. + + :param use: whether to enable colors or not + :type use: integer + """ + if use == 1: + if not (sys.stderr.isatty() or sys.stdout.isatty()): + use = 0 + if Utils.is_win32 and os.name != 'java': + term = os.environ.get('TERM', '') # has ansiterm + else: + term = os.environ.get('TERM', 'dumb') + + if term in ('dumb', 'emacs'): + use = 0 + + if use >= 1: + os.environ['TERM'] = 'vt100' + + colors_lst['USE'] = use + +# If console packages are available, replace the dummy function with a real +# implementation +try: + get_term_cols = ansiterm.get_term_cols +except AttributeError: + def get_term_cols(): + return 80 + +get_term_cols.__doc__ = """ + Returns the console width in characters. + + :return: the number of characters per line + :rtype: int + """ + +def get_color(cl): + """ + Returns the ansi sequence corresponding to the given color name. + An empty string is returned when coloring is globally disabled. + + :param cl: color name in capital letters + :type cl: string + """ + if colors_lst['USE']: + return colors_lst.get(cl, '') + return '' + +class color_dict(object): + """attribute-based color access, eg: colors.PINK""" + def __getattr__(self, a): + return get_color(a) + def __call__(self, a): + return get_color(a) + +colors = color_dict() + +re_log = re.compile(r'(\w+): (.*)', re.M) +class log_filter(logging.Filter): + """ + Waf logs are of the form 'name: message', and can be filtered by 'waf --zones=name'. + For example, the following:: + + from waflib import Logs + Logs.debug('test: here is a message') + + Will be displayed only when executing:: + + $ waf --zones=test + """ + def __init__(self, name=''): + logging.Filter.__init__(self, name) + + def filter(self, rec): + """ + Filters log records by zone and by logging level + + :param rec: log entry + """ + rec.zone = rec.module + if rec.levelno >= logging.INFO: + return True + + m = re_log.match(rec.msg) + if m: + rec.zone = m.group(1) + rec.msg = m.group(2) + + if zones: + return getattr(rec, 'zone', '') in zones or '*' in zones + elif not verbose > 2: + return False + return True + +class log_handler(logging.StreamHandler): + """Dispatches messages to stderr/stdout depending on the severity level""" + def emit(self, record): + """ + Delegates the functionality to :py:meth:`waflib.Log.log_handler.emit_override` + """ + # default implementation + try: + try: + self.stream = record.stream + except AttributeError: + if record.levelno >= logging.WARNING: + record.stream = self.stream = sys.stderr + else: + record.stream = self.stream = sys.stdout + self.emit_override(record) + self.flush() + except (KeyboardInterrupt, SystemExit): + raise + except: # from the python library -_- + self.handleError(record) + + def emit_override(self, record, **kw): + """ + Writes the log record to the desired stream (stderr/stdout) + """ + self.terminator = getattr(record, 'terminator', '\n') + stream = self.stream + if unicode: + # python2 + msg = self.formatter.format(record) + fs = '%s' + self.terminator + try: + if (isinstance(msg, unicode) and getattr(stream, 'encoding', None)): + fs = fs.decode(stream.encoding) + try: + stream.write(fs % msg) + except UnicodeEncodeError: + stream.write((fs % msg).encode(stream.encoding)) + else: + stream.write(fs % msg) + except UnicodeError: + stream.write((fs % msg).encode('utf-8')) + else: + logging.StreamHandler.emit(self, record) + +class formatter(logging.Formatter): + """Simple log formatter which handles colors""" + def __init__(self): + logging.Formatter.__init__(self, LOG_FORMAT, HOUR_FORMAT) + + def format(self, rec): + """ + Formats records and adds colors as needed. The records do not get + a leading hour format if the logging level is above *INFO*. + """ + try: + msg = rec.msg.decode('utf-8') + except Exception: + msg = rec.msg + + use = colors_lst['USE'] + if (use == 1 and rec.stream.isatty()) or use == 2: + + c1 = getattr(rec, 'c1', None) + if c1 is None: + c1 = '' + if rec.levelno >= logging.ERROR: + c1 = colors.RED + elif rec.levelno >= logging.WARNING: + c1 = colors.YELLOW + elif rec.levelno >= logging.INFO: + c1 = colors.GREEN + c2 = getattr(rec, 'c2', colors.NORMAL) + msg = '%s%s%s' % (c1, msg, c2) + else: + # remove single \r that make long lines in text files + # and other terminal commands + msg = re.sub(r'\r(?!\n)|\x1B\[(K|.*?(m|h|l))', '', msg) + + if rec.levelno >= logging.INFO: + # the goal of this is to format without the leading "Logs, hour" prefix + if rec.args: + return msg % rec.args + return msg + + rec.msg = msg + rec.c1 = colors.PINK + rec.c2 = colors.NORMAL + return logging.Formatter.format(self, rec) + +log = None +"""global logger for Logs.debug, Logs.error, etc""" + +def debug(*k, **kw): + """ + Wraps logging.debug and discards messages if the verbosity level :py:attr:`waflib.Logs.verbose` ≤ 0 + """ + if verbose: + k = list(k) + k[0] = k[0].replace('\n', ' ') + log.debug(*k, **kw) + +def error(*k, **kw): + """ + Wrap logging.errors, adds the stack trace when the verbosity level :py:attr:`waflib.Logs.verbose` ≥ 2 + """ + log.error(*k, **kw) + if verbose > 2: + st = traceback.extract_stack() + if st: + st = st[:-1] + buf = [] + for filename, lineno, name, line in st: + buf.append(' File %r, line %d, in %s' % (filename, lineno, name)) + if line: + buf.append(' %s' % line.strip()) + if buf: + log.error('\n'.join(buf)) + +def warn(*k, **kw): + """ + Wraps logging.warning + """ + log.warning(*k, **kw) + +def info(*k, **kw): + """ + Wraps logging.info + """ + log.info(*k, **kw) + +def init_log(): + """ + Initializes the logger :py:attr:`waflib.Logs.log` + """ + global log + log = logging.getLogger('waflib') + log.handlers = [] + log.filters = [] + hdlr = log_handler() + hdlr.setFormatter(formatter()) + log.addHandler(hdlr) + log.addFilter(log_filter()) + log.setLevel(logging.DEBUG) + +def make_logger(path, name): + """ + Creates a simple logger, which is often used to redirect the context command output:: + + from waflib import Logs + bld.logger = Logs.make_logger('test.log', 'build') + bld.check(header_name='sadlib.h', features='cxx cprogram', mandatory=False) + + # have the file closed immediately + Logs.free_logger(bld.logger) + + # stop logging + bld.logger = None + + The method finalize() of the command will try to free the logger, if any + + :param path: file name to write the log output to + :type path: string + :param name: logger name (loggers are reused) + :type name: string + """ + logger = logging.getLogger(name) + if sys.hexversion > 0x3000000: + encoding = sys.stdout.encoding + else: + encoding = None + hdlr = logging.FileHandler(path, 'w', encoding=encoding) + formatter = logging.Formatter('%(message)s') + hdlr.setFormatter(formatter) + logger.addHandler(hdlr) + logger.setLevel(logging.DEBUG) + return logger + +def make_mem_logger(name, to_log, size=8192): + """ + Creates a memory logger to avoid writing concurrently to the main logger + """ + from logging.handlers import MemoryHandler + logger = logging.getLogger(name) + hdlr = MemoryHandler(size, target=to_log) + formatter = logging.Formatter('%(message)s') + hdlr.setFormatter(formatter) + logger.addHandler(hdlr) + logger.memhandler = hdlr + logger.setLevel(logging.DEBUG) + return logger + +def free_logger(logger): + """ + Frees the resources held by the loggers created through make_logger or make_mem_logger. + This is used for file cleanup and for handler removal (logger objects are re-used). + """ + try: + for x in logger.handlers: + x.close() + logger.removeHandler(x) + except Exception: + pass + +def pprint(col, msg, label='', sep='\n'): + """ + Prints messages in color immediately on stderr:: + + from waflib import Logs + Logs.pprint('RED', 'Something bad just happened') + + :param col: color name to use in :py:const:`Logs.colors_lst` + :type col: string + :param msg: message to display + :type msg: string or a value that can be printed by %s + :param label: a message to add after the colored output + :type label: string + :param sep: a string to append at the end (line separator) + :type sep: string + """ + info('%s%s%s %s', colors(col), msg, colors.NORMAL, label, extra={'terminator':sep}) + |