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"""Bcfg2 logging support"""
__revision__ = '$Revision$'
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:
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 i in range(inner_lines):
returns.append("%s" % (line[i * line_len:(i + 1) * line_len]))
elif isinstance(record.msg, list):
if not record.msg:
return ''
record.msg.sort()
msgwidth = self.width
columnWidth = max([len(item) for item in record.msg])
columns = int(math.floor(float(msgwidth) / (columnWidth + 2)))
lines = int(math.ceil(float(len(record.msg)) / columns))
for lineNumber in range(lines):
indices = [idx for idx in [(colNum * lines) + lineNumber
for colNum in range(columns)] if idx < len(record.msg)]
format = (len(indices) * (" %%-%ds " % columnWidth))
returns.append(format % 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
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 = self.log_format_string % (self.encodePriority(self.facility,
newrec.levelname.lower()),
self.format(newrec))
try:
self.socket.send(msg.encode('ascii'))
except socket.error:
for i in range(10):
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:
self.socket.send("Reconnected to syslog")
self.socket.send(msg)
except:
"""
If we still fail then drop it. Running bcfg2-server as non-root can
trigger permission denied exceptions.
"""
pass
def add_console_handler(level):
"""Add a logging handler that logs at a level to sys.stdout."""
console = logging.StreamHandler(sys.stdout)
if level is True:
console.setLevel(logging.DEBUG)
else:
console.setLevel(level)
# tell the handler to use this format
console.setFormatter(TermiosFormatter())
logging.root.addHandler(console)
def add_syslog_handler(procname, syslog_facility):
"""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)
syslog.setLevel(logging.DEBUG)
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):
"""Add a logging handler that logs to to_file."""
filelog = logging.FileHandler(to_file)
filelog.setLevel(logging.DEBUG)
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
if to_console:
add_console_handler(to_console)
if to_syslog:
add_syslog_handler(procname, syslog_facility)
if to_file is not None:
add_file_handler(to_file)
logging.root.setLevel(level)
logging.already_setup = True
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