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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
def print_attributes(attrib):
"""Add the attributes for an element."""
return ' '.join(['%s="%s"' % data for data in list(attrib.items())])
def print_text(text):
"""Add text to the output (which will need normalising."""
charmap = {'<':'<', '>':'>', '&':'&'}
return ''.join([charmap.get(char, char) for char in text]) + '\n'
def xml_print(element, running_indent=0, indent=4):
"""Add an element and its children to the return string."""
if (len(element.getchildren()) == 0) and (not element.text):
ret = (' ' * running_indent)
ret += '<%s %s/>\n' % (element.tag, print_attributes(element.attrib))
else:
child_indent = running_indent + indent
ret = (' ' * running_indent)
ret += '<%s%s>\n' % (element.tag, print_attributes(element))
if element.text:
ret += (' '* child_indent) + print_text(element.text)
for child in element.getchildren():
ret += xml_print(child, child_indent, indent)
ret += (' ' * running_indent) + '</%s>\n' % (element.tag)
if element.tail:
ret += (' ' * child_indent) + print_text(element.tail)
return ret
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]))
#elif type(record.msg) == lxml.etree._Element:
# returns.append(str(xml_print(record.msg)))
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 str(record.msg) > 250:
msgs = []
error = record.exc_info
record.exc_info = None
msgdata = record.msg
while msgdata:
newrec = copy.deepcopy(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)
except socket.error:
for i in xrange(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
self.socket.send("Reconnected to syslog")
self.socket.send(msg)
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
# add the handler to the root logger
if to_console:
console = logging.StreamHandler(sys.stdout)
console.setLevel(logging.DEBUG)
# tell the handler to use this format
console.setFormatter(TermiosFormatter())
logging.root.addHandler(console)
if to_syslog:
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")
if not to_file == None:
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)
logging.root.setLevel(level)
logging.already_setup = True
def trace_process(**kwargs):
"""Literally log every line of python code as it runs.
Keyword arguments:
log -- file (name) to log to (default stderr)
scope -- base scope to log to (default Cobalt)
"""
file_name = kwargs.get("log", None)
if file_name is not None:
log_file = open(file_name, "w")
else:
log_file = sys.stderr
scope = kwargs.get("scope", "Cobalt")
def traceit(frame, event, arg):
if event == "line":
lineno = frame.f_lineno
filename = frame.f_globals["__file__"]
if (filename.endswith(".pyc") or
filename.endswith(".pyo")):
filename = filename[:-1]
name = frame.f_globals["__name__"]
line = linecache.getline(filename, lineno)
print >> log_file, "%s:%s: %s" % (name, lineno, line.rstrip())
return traceit
sys.settrace(traceit)
def log_to_stderr(logger_name, level=logging.INFO):
"""Set up console logging."""
try:
logger = logging.getLogger(logger_name)
except:
# assume logger_name is already a logger
logger = logger_name
handler = logging.StreamHandler() # sys.stderr is the default stream
handler.setLevel(level)
handler.setFormatter(TermiosFormatter()) # investigate this formatter
logger.addHandler(handler)
def log_to_syslog(logger_name, level=logging.INFO, format='%(name)s[%(process)d]: %(message)s'):
"""Set up syslog logging."""
try:
logger = logging.getLogger(logger_name)
except:
# assume logger_name is already a logger
logger = logger_name
# anticipate an exception somewhere below
handler = logging.handlers.SysLogHandler() # investigate FragmentingSysLogHandler
handler.setLevel(level)
handler.setFormatter(logging.Formatter(format))
logger.addHandler(handler)
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