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#!/usr/bin/env python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import argparse
import collections
import functools
import sys
import time
from oslo_serialization import jsonutils
from oslo_utils import importutils
from oslo_log import log
termcolor = importutils.try_import('termcolor')
_USE_COLOR = False
DEFAULT_LEVEL_KEY = 'levelname'
DEFAULT_TRACEBACK_KEY = 'traceback'
def main():
global _USE_COLOR
args = parse_args()
_USE_COLOR = args.color
formatter = functools.partial(
console_format,
args.prefix,
args.locator,
loggers=args.loggers,
levels=args.levels,
level_key=args.levelkey,
traceback_key=args.tbkey,
)
if args.lines:
# Read backward until we find all of our newline characters
# or reach the beginning of the file
args.file.seek(0, 2)
newlines = 0
pos = args.file.tell()
while newlines <= args.lines and pos > 0:
pos = pos - 1
args.file.seek(pos)
if args.file.read(1) == '\n':
newlines = newlines + 1
try:
for line in reformat_json(args.file, formatter, args.follow):
print(line)
except KeyboardInterrupt:
sys.exit(0)
def parse_args():
parser = argparse.ArgumentParser()
parser.add_argument("file",
nargs='?', default=sys.stdin,
type=argparse.FileType(),
help="JSON log file to read from (if not provided"
" standard input is used instead)")
parser.add_argument("--prefix",
default='%(asctime)s.%(msecs)03d'
' %(process)s %(levelname)s %(name)s',
help="Message prefixes")
parser.add_argument("--locator",
default='[%(funcname)s %(pathname)s:%(lineno)s]',
help="Locator to append to DEBUG records")
parser.add_argument("--levelkey",
default=DEFAULT_LEVEL_KEY,
help="Key in the JSON record where the level is held")
parser.add_argument("--tbkey",
default=DEFAULT_TRACEBACK_KEY,
help="Key in the JSON record where the"
" traceback/exception is held")
parser.add_argument("-c", "--color",
action='store_true', default=False,
help="Color log levels (requires `termcolor`)")
parser.add_argument("-f", "--follow",
action='store_true', default=False,
help="Continue parsing new data until"
" KeyboardInterrupt")
parser.add_argument("-n", "--lines",
required=False, type=int,
help="Last N number of records to view."
" (May show less than N records when used"
" in conjuction with --loggers or --levels)")
parser.add_argument("--loggers",
nargs='*', default=[],
help="only return results matching given logger(s)")
parser.add_argument("--levels",
nargs='*', default=[],
help="Only return lines matching given log level(s)")
args = parser.parse_args()
if args.color and not termcolor:
raise ImportError("Coloring requested but `termcolor` is not"
" importable")
return args
def colorise(key, text=None):
if text is None:
text = key
if not _USE_COLOR:
return text
colors = {
'exc': ('red', ['reverse', 'bold']),
'FATAL': ('red', ['reverse', 'bold']),
'ERROR': ('red', ['bold']),
'WARNING': ('yellow', ['bold']),
'WARN': ('yellow', ['bold']),
'INFO': ('white', ['bold']),
}
color, attrs = colors.get(key, ('', []))
if color:
return termcolor.colored(text, color=color, attrs=attrs)
return text
def warn(prefix, msg):
return "%s: %s" % (colorise('exc', prefix), msg)
def reformat_json(fh, formatter, follow=False):
# using readline allows interactive stdin to respond to every line
while True:
line = fh.readline()
if not line:
if follow:
time.sleep(0.1)
continue
else:
break
line = line.strip()
if not line:
continue
try:
record = jsonutils.loads(line)
except ValueError:
yield warn("Not JSON", line)
continue
for out_line in formatter(record):
yield out_line
def console_format(prefix, locator, record, loggers=[], levels=[],
level_key=DEFAULT_LEVEL_KEY,
traceback_key=DEFAULT_TRACEBACK_KEY):
# Provide an empty string to format-specifiers the record is
# missing, instead of failing. Doesn't work for non-string
# specifiers.
record = collections.defaultdict(str, record)
# skip if the record doesn't match a logger we are looking at
if loggers:
name = record.get('name')
if not any(name.startswith(n) for n in loggers):
return
if levels:
if record.get(level_key) not in levels:
return
levelname = record.get(level_key)
if levelname:
record[level_key] = colorise(levelname)
try:
prefix = prefix % record
except TypeError:
# Thrown when a non-string format-specifier can't be filled in.
# Dict comprehension cleans up the output
yield warn('Missing non-string placeholder in record',
{str(k): str(v) if isinstance(v, str) else v
for k, v in record.items()})
return
locator = ''
if (record.get('levelno', 100) <= log.DEBUG or levelname == 'DEBUG'):
locator = locator % record
yield ' '.join(x for x in [prefix, record['message'], locator] if x)
tb = record.get(traceback_key)
if tb:
if type(tb) is str:
tb = tb.rstrip().split("\n")
for tb_line in tb:
yield ' '.join([prefix, tb_line])
if __name__ == '__main__':
main()
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