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"""Bcfg2 logging support"""
import copy
import fcntl
import logging
import logging.handlers
import math
import socket
import struct
import sys
import termios
logging.raiseExceptions = 0
class TermiosFormatter(logging.Formatter):
"""The termios formatter displays output
in a terminal-sensitive fashion.
"""
def __init__(self, fmt=None, datefmt=None):
logging.Formatter.__init__(self, fmt, datefmt)
if sys.stdout.isatty():
# now get termios info
try:
self.width = struct.unpack('hhhh',
fcntl.ioctl(0,
termios.TIOCGWINSZ,
"\000" * 8))[1]
if self.width == 0:
self.width = 80
except: # pylint: disable=W0702
self.width = 80
else:
# output to a pipe
self.width = 32768
def format(self, record):
'''format a record for display'''
returns = []
line_len = self.width
if isinstance(record.msg, str):
for line in record.msg.split('\n'):
if len(line) <= line_len:
returns.append(line)
else:
inner_lines = \
int(math.floor(float(len(line)) / line_len)) + 1
for msgline in range(inner_lines):
returns.append(
line[msgline * line_len:(msgline + 1) * line_len])
elif isinstance(record.msg, list):
if not record.msg:
return ''
record.msg.sort()
msgwidth = self.width
col_width = max([len(item) for item in record.msg])
columns = int(math.floor(float(msgwidth) / (col_width + 2)))
lines = int(math.ceil(float(len(record.msg)) / columns))
for lineno in range(lines):
indices = [idx for idx in [(colNum * lines) + lineno
for colNum in range(columns)]
if idx < len(record.msg)]
retformat = (len(indices) * (" %%-%ds " % col_width))
returns.append(retformat % tuple([record.msg[idx]
for idx in indices]))
else:
returns.append(str(record.msg))
if record.exc_info:
returns.append(self.formatException(record.exc_info))
return '\n'.join(returns)
class FragmentingSysLogHandler(logging.handlers.SysLogHandler):
"""
This handler fragments messages into
chunks smaller than 250 characters
"""
def __init__(self, procname, path, facility):
self.procname = procname
self.unixsocket = False
logging.handlers.SysLogHandler.__init__(self, path, facility)
def emit(self, record):
"""Chunk and deliver records."""
record.name = self.procname
if isinstance(record.msg, str):
msgs = []
error = record.exc_info
record.exc_info = None
msgdata = record.msg
if len(msgdata) == 0:
return
while msgdata:
newrec = copy.copy(record)
newrec.msg = msgdata[:250]
msgs.append(newrec)
msgdata = msgdata[250:]
msgs[0].exc_info = error
else:
msgs = [record]
for newrec in msgs:
msg = '<%d>%s\000' % \
(self.encodePriority(self.facility, newrec.levelname.lower()),
self.format(newrec))
try:
try:
encoded = msg.encode('utf-8')
except UnicodeDecodeError:
encoded = msg
self.socket.send(encoded)
except socket.error:
for i in range(10): # pylint: disable=W0612
try:
if isinstance(self.address, tuple):
self.socket = socket.socket(socket.AF_INET,
socket.SOCK_DGRAM)
self.socket.connect(self.address)
else:
self._connect_unixsocket(self.address)
break
except socket.error:
continue
try:
reconn = copy.copy(record)
reconn.msg = 'Reconnected to syslog'
self.socket.send('<%d>%s\000' %
(self.encodePriority(self.facility,
logging.WARNING),
self.format(reconn)))
self.socket.send(msg)
except: # pylint: disable=W0702
# If we still fail then drop it. Running
# bcfg2-server as non-root can trigger permission
# denied exceptions.
pass
def add_console_handler(level=logging.DEBUG):
""" Add a logging handler that logs at a level to sys.stderr """
console = logging.StreamHandler(sys.stderr)
console.setLevel(level)
# tell the handler to use this format
console.setFormatter(TermiosFormatter())
try:
console.set_name("console") # pylint: disable=E1101
except AttributeError:
console.name = "console" # pylint: disable=W0201
logging.root.addHandler(console)
def add_syslog_handler(procname, syslog_facility, level=logging.DEBUG):
"""Add a logging handler that logs as procname to syslog_facility."""
try:
try:
syslog = FragmentingSysLogHandler(procname,
'/dev/log',
syslog_facility)
except socket.error:
syslog = FragmentingSysLogHandler(procname,
('localhost', 514),
syslog_facility)
try:
syslog.set_name("syslog") # pylint: disable=E1101
except AttributeError:
syslog.name = "syslog" # pylint: disable=W0201
syslog.setLevel(level)
syslog.setFormatter(
logging.Formatter('%(name)s[%(process)d]: %(message)s'))
logging.root.addHandler(syslog)
except socket.error:
logging.root.error("Failed to activate syslogging")
except:
print("Failed to activate syslogging")
def add_file_handler(to_file, level=logging.DEBUG):
"""Add a logging handler that logs to to_file."""
filelog = logging.FileHandler(to_file)
try:
filelog.set_name("file") # pylint: disable=E1101
except AttributeError:
filelog.name = "file" # pylint: disable=W0201
filelog.setLevel(level)
filelog.setFormatter(
logging.Formatter('%(asctime)s %(name)s[%(process)d]: %(message)s'))
logging.root.addHandler(filelog)
def setup_logging(procname, to_console=True, to_syslog=True,
syslog_facility='daemon', level=0, to_file=None):
"""Setup logging for Bcfg2 software."""
if hasattr(logging, 'already_setup'):
return
params = []
if to_console:
if to_console is True:
to_console = logging.WARNING
if level == 0:
clvl = to_console
else:
clvl = min(to_console, level)
params.append("%s to console" % logging.getLevelName(clvl))
add_console_handler(clvl)
if to_syslog:
if level == 0:
slvl = logging.INFO
else:
slvl = min(level, logging.INFO)
params.append("%s to syslog" % logging.getLevelName(slvl))
add_syslog_handler(procname, syslog_facility, level=slvl)
if to_file is not None:
params.append("%s to %s" % (logging.getLevelName(level), to_file))
add_file_handler(to_file, level=level)
logging.root.setLevel(logging.DEBUG)
logging.root.debug("Configured logging: %s" % "; ".join(params))
logging.already_setup = True
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