4 """A very simple logger that tries to be concurrency-safe."""
12 LOG_FILE = '/var/log/nm'
13 LOG_SLIVERS = '/var/log/getslivers.txt'
15 # Thierry - trying to debug this for 4.2
16 # basically define 3 levels
20 # default is to log a reasonable amount of stuff for when running on operational nodes
25 assert level in [LOG_NONE,LOG_NODE,LOG_VERBOSE]
29 log('(v) '+msg,LOG_VERBOSE)
31 def log(msg,level=LOG_NODE):
32 """Write <msg> to the log file if level >= current log level (default LOG_NODE)."""
33 if (level > LOG_LEVEL):
36 fd = os.open(LOG_FILE, os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0600)
37 if not msg.endswith('\n'): msg += '\n'
38 os.write(fd, '%s: %s' % (time.asctime(time.gmtime()), msg))
45 log('running command %s' % ' '.join(args))
47 child = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
48 child.wait() # wait for proc to hang up
50 raise Exception("command failed:\n stdout - %s\n stderr - %s" % \
51 (child.stdout.readlines(), child.stderr.readlines()))
52 except: log_exc('failed to run command %s' % ' '.join(args))
54 def log_exc(msg="",name=None):
55 """Log the traceback resulting from an exception."""
57 log("%s: EXCEPTION caught <%s> \n %s" %(name, msg, traceback.format_exc()))
59 log("EXCEPTION caught <%s> \n %s" %(msg, traceback.format_exc()))
61 # for some reason the various modules are still triggered even when the
62 # data from PLC cannot be reached
63 # we show this message instead of the exception stack instead in this case
64 def log_missing_data (msg,key):
65 log("%s: could not find the %s key in data (PLC connection down?) - IGNORED"%(msg,key))
67 def log_data_in_file (data, file, message=""):
71 now=time.strftime("Last update: %Y.%m.%d at %H:%M:%S %Z", time.localtime())
73 if message: f.write('Message:'+message+'\n')
74 pp=pprint.PrettyPrinter(stream=f,indent=2)
78 log_verbose('log_data_in_file failed - file=%s - message=%r'%(file,message))
80 def log_slivers (data):
81 log_data_in_file (data, LOG_SLIVERS, "raw GetSlivers")