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#! /usr/bin/env python2
"""
Filters a file, classifying output in errors, warnings and discarding
the rest.
Given a set of regular expresions read from files named *.conf in the
given configuration path(s), of the format:
#
# Comments for multiline regex 1...
#
MULTILINEPYTHONREGEX
MULTILINEPYTHONREGEX
MULTILINEPYTHONREGEX
#
# Comments for multiline regex 2...
#
#WARNING
MULTILINEPYTHONREGEX2
MULTILINEPYTHONREGEX2
Anything matched by MULTILINEPYTHONREGEX will be considered something
to be filtered out and not printed.
Anything matched by MULTILINEPYHONREGEX with a #WARNING tag in the
comment means (optional) means that it describes something that is
considered to be a warning. Print it to stderr.
Anything leftover is considred to be errors, printed to stdout.
"""
import argparse
import logging
import mmap
import os
import re
import sre_constants
import sys
import traceback
exclude_regexs = []
# first is a list of one or more comment lines
# followed by a list of non-comments which describe a multiline regex
config_regex = \
"(?P<comment>(^\s*#.*\n)+)" \
"(?P<regex>(^[^#].*\n)+)"
def config_import_file(filename):
"""
Imports regular expresions from any file *.conf in the given path,
format as given in the main doc
"""
try:
with open(filename, "rb") as f:
mm = mmap.mmap(f.fileno(), 0, access = mmap.ACCESS_READ)
# That regex basically selects any block of
# lines that is not a comment block. The
# finditer() finds all the blocks and selects
# the bits of mmapped-file that comprises
# each--we compile it into a regex and append.
for m in re.finditer(config_regex, mm, re.MULTILINE):
origin = "%s:%s-%s" % (filename, m.start(), m.end())
gd = m.groupdict()
comment = gd['comment']
regex = gd['regex']
try:
r = re.compile(regex, re.MULTILINE)
except sre_constants.error as e:
logging.error("%s: bytes %d-%d: bad regex: %s",
filename, m.start(), m.end(), e)
raise
logging.debug("%s: found regex at bytes %d-%d: %s",
filename, m.start(), m.end(), regex)
if '#WARNING' in comment:
exclude_regexs.append((r, origin, ('warning',)))
else:
exclude_regexs.append((r, origin, ()))
logging.debug("%s: loaded", filename)
except Exception as e:
logging.error("E: %s: can't load config file: %s" % (filename, e))
raise
def config_import_path(path):
"""
Imports regular expresions from any file *.conf in the given path
"""
file_regex = re.compile(".*\.conf$")
try:
for dirpath, dirnames, filenames in os.walk(path):
for _filename in sorted(filenames):
filename = os.path.join(dirpath, _filename)
if not file_regex.search(_filename):
logging.debug("%s: ignored", filename)
continue
config_import_file(filename)
except Exception as e:
raise Exception("E: %s: can't load config files: %s %s" % (path,
e, traceback.format_exc()))
def config_import(paths):
"""
Imports regular expresions from any file *.conf in the list of paths.
If a path is "" or None, the list of paths until then is flushed
and only the new ones are considered.
"""
_paths = []
# Go over the list, flush it if the user gave an empty path ("")
for path in paths:
if path == "" or path == None:
logging.debug("flushing current config list: %s", _paths)
_paths = []
else:
_paths.append(path)
logging.debug("config list: %s", _paths)
for path in _paths:
config_import_path(path)
arg_parser = argparse.ArgumentParser(
description = __doc__,
formatter_class = argparse.RawDescriptionHelpFormatter)
arg_parser.add_argument("-v", "--verbosity", action = "count", default = 0,
help = "increase verbosity")
arg_parser.add_argument("-q", "--quiet", action = "count", default = 0,
help = "decrease verbosity")
arg_parser.add_argument("-e", "--errors", action = "store", default = None,
help = "file where to store errors")
arg_parser.add_argument("-w", "--warnings", action = "store", default = None,
help = "file where to store warnings")
arg_parser.add_argument("-c", "--config-dir", action = "append", nargs = "?",
default = [ ".known-issues/" ],
help = "configuration directory (multiple can be "
"given; if none given, clears the current list) "
"%(default)s")
arg_parser.add_argument("FILENAMEs", nargs = "+",
help = "files to filter")
args = arg_parser.parse_args()
logging.basicConfig(level = 40 - 10 * (args.verbosity - args.quiet),
format = "%(levelname)s: %(message)s")
path = ".known-issues/"
logging.debug("Reading configuration from directory `%s`", path)
config_import(args.config_dir)
exclude_ranges = []
if args.warnings:
warnings = open(args.warnings, "w")
else:
warnings = None
if args.errors:
errors = open(args.errors, "w")
else:
errors = None
def report_error(data):
sys.stdout.write(data)
if errors:
errors.write(data)
def report_warning(data):
sys.stderr.write(data)
if warnings:
warnings.write(data)
if args.warnings:
warnings = open(args.warnings, "w")
else:
warnings = None
if args.errors:
errors = open(args.errors, "w")
else:
errors = None
def report_error(data):
sys.stdout.write(data)
if errors:
errors.write(data)
def report_warning(data):
sys.stderr.write(data)
if warnings:
warnings.write(data)
for filename in args.FILENAMEs:
try:
with open(filename, "r+b") as f:
logging.info("%s: filtering", filename)
# Yeah, this should be more protected in case of exception
# and such, but this is a short running program...
mm = mmap.mmap(f.fileno(), 0)
for ex, origin, flags in exclude_regexs:
logging.info("%s: searching from %s: %s",
filename, origin, ex.pattern)
for m in re.finditer(ex.pattern, mm, re.MULTILINE):
logging.info("%s: %s-%s: match from from %s %s",
filename, m.start(), m.end(), origin, flags)
if 'warning' in flags:
exclude_ranges.append((m.start(), m.end(), True))
else:
exclude_ranges.append((m.start(), m.end(), False))
exclude_ranges = sorted(exclude_ranges, key=lambda r: r[0])
logging.warning("%s: ranges excluded: %s", filename, exclude_ranges)
# Decide what to do with what has been filtered; warnings
# go to stderr and warnings file, errors to stdout, what
# is ignored is just dumped.
offset = 0
for b, e, warning in exclude_ranges:
mm.seek(offset)
if b > offset:
# We have something not caught by a filter, an error
logging.info("%s: error range (%d, %d), from %d %dB",
filename, offset, b, offset, b - offset)
report_error(mm.read(b - offset))
mm.seek(b)
if warning == True: # A warning, print it
mm.seek(b)
logging.info("%s: warning range (%d, %d), from %d %dB",
filename, b, e, offset, e - b)
report_warning(mm.read(e - b))
else: # Exclude, ignore it
d = b - offset
logging.info("%s: exclude range (%d, %d), from %d %dB",
filename, b, e, offset, d)
offset = e
mm.seek(offset)
if len(mm) != offset:
logging.info("%s: error final range (%d, %d), from %d %dB",
filename, b, e, offset, e - b)
report_error(mm.read(len(mm) - offset - 1))
del mm
except Exception as e:
logging.error("%s: cannot load: %s", filename, e)
raise
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