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#!/usr/bin/env python -tt
# vim: ai ts=4 sts=4 et sw=4
#
# Copyright (c) 2009, 2010, 2011 Intel, Inc.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; version 2 of the License
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc., 59
# Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import os
import sys
import re
import time
__ALL__ = ['get_loglevel',
'set_loglevel',
'set_logfile',
'debug',
'verbose',
'info',
'warning',
'error',
]
# COLORs in ANSI
INFO_COLOR = 32 # green
WARN_COLOR = 33 # yellow
ERR_COLOR = 31 # red
ASK_COLOR = 34 # blue
NO_COLOR = 0
PREFIX_RE = re.compile('^<(.*?)>\s*(.*)', re.S)
INTERACTIVE = True
LOG_LEVEL = 1
LOG_LEVELS = {
'quiet': 0,
'normal': 1,
'verbose': 2,
'debug': 3,
'never': 4,
}
LOG_FILE_FP = None
LOG_CONTENT = ''
CATCHERR_BUFFILE_FD = -1
CATCHERR_BUFFILE_PATH = None
CATCHERR_SAVED_2 = -1
def _general_print(head, color, msg=None, stream=None, level='normal'):
global LOG_CONTENT
if not stream:
stream = sys.stdout
if LOG_LEVELS[level] > LOG_LEVEL:
# skip
return
errormsg = ''
if CATCHERR_BUFFILE_FD > 0:
size = os.lseek(CATCHERR_BUFFILE_FD, 0, os.SEEK_END)
os.lseek(CATCHERR_BUFFILE_FD, 0, os.SEEK_SET)
errormsg = os.read(CATCHERR_BUFFILE_FD, size)
os.ftruncate(CATCHERR_BUFFILE_FD, 0)
# append error msg to LOG
if errormsg:
LOG_CONTENT += errormsg
# append normal msg to LOG
save_msg = msg.strip() if msg else None
if save_msg:
timestr = time.strftime("[%m/%d %H:%M:%S %Z] ", time.localtime())
LOG_CONTENT += timestr + save_msg + '\n'
if errormsg:
_color_print('', NO_COLOR, errormsg, stream, level)
_color_print(head, color, msg, stream, level)
def _color_print(head, color, msg, stream, level):
colored = True
if color == NO_COLOR or \
not stream.isatty() or \
os.getenv('ANSI_COLORS_DISABLED') is not None:
colored = False
if head.startswith('\r'):
# need not \n at last
newline = False
else:
newline = True
if colored:
head = '\033[%dm%s:\033[0m ' %(color, head)
if not newline:
# ESC cmd to clear line
head = '\033[2K' + head
else:
if head:
head += ': '
if head.startswith('\r'):
head = head.lstrip()
newline = True
if msg is not None:
stream.write('%s%s' % (head, msg))
if newline:
stream.write('\n')
stream.flush()
def _color_perror(head, color, msg, level='normal'):
if CATCHERR_BUFFILE_FD > 0:
_general_print(head, color, msg, sys.stdout, level)
else:
_general_print(head, color, msg, sys.stderr, level)
def _split_msg(head, msg):
if isinstance(msg, list):
msg = '\n'.join(map(str, msg))
if msg.startswith('\n'):
# means print \n at first
msg = msg.lstrip()
head = '\n' + head
elif msg.startswith('\r'):
# means print \r at first
msg = msg.lstrip()
head = '\r' + head
match = PREFIX_RE.match(msg)
if match:
head += ' <%s>' % match.group(1)
msg = match.group(2)
return head, msg
def get_loglevel():
return next((k for k, v in LOG_LEVELS.items() if v == LOG_LEVEL))
def set_loglevel(level):
global LOG_LEVEL
if level not in LOG_LEVELS:
# no effect
return
LOG_LEVEL = LOG_LEVELS[level]
def set_interactive(mode=True):
global INTERACTIVE
if mode:
INTERACTIVE = True
else:
INTERACTIVE = False
def log(msg=''):
# log msg to LOG_CONTENT then save to logfile
global LOG_CONTENT
if msg:
LOG_CONTENT += msg
def info(msg):
head, msg = _split_msg('Info', msg)
_general_print(head, INFO_COLOR, msg)
def verbose(msg):
head, msg = _split_msg('Verbose', msg)
_general_print(head, INFO_COLOR, msg, level='verbose')
def warning(msg):
head, msg = _split_msg('Warning', msg)
_color_perror(head, WARN_COLOR, msg)
def debug(msg):
head, msg = _split_msg('Debug', msg)
_color_perror(head, ERR_COLOR, msg, level='debug')
def error(msg):
head, msg = _split_msg('Error', msg)
_color_perror(head, ERR_COLOR, msg)
sys.exit(1)
def set_logfile(fpath):
global LOG_FILE_FP
def _savelogf():
if LOG_FILE_FP:
with open(LOG_FILE_FP, 'w') as log:
log.write(LOG_CONTENT)
if LOG_FILE_FP is not None:
warning('duplicate log file configuration')
LOG_FILE_FP = fpath
import atexit
atexit.register(_savelogf)
def enable_logstderr(fpath):
global CATCHERR_BUFFILE_FD
global CATCHERR_BUFFILE_PATH
global CATCHERR_SAVED_2
if os.path.exists(fpath):
os.remove(fpath)
CATCHERR_BUFFILE_PATH = fpath
CATCHERR_BUFFILE_FD = os.open(CATCHERR_BUFFILE_PATH, os.O_RDWR|os.O_CREAT)
CATCHERR_SAVED_2 = os.dup(2)
os.dup2(CATCHERR_BUFFILE_FD, 2)
def disable_logstderr():
global CATCHERR_BUFFILE_FD
global CATCHERR_BUFFILE_PATH
global CATCHERR_SAVED_2
raw(msg=None) # flush message buffer and print it.
os.dup2(CATCHERR_SAVED_2, 2)
os.close(CATCHERR_SAVED_2)
os.close(CATCHERR_BUFFILE_FD)
os.unlink(CATCHERR_BUFFILE_PATH)
CATCHERR_BUFFILE_FD = -1
CATCHERR_BUFFILE_PATH = None
CATCHERR_SAVED_2 = -1
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