+# $Id$
+# $URL$
+
"""A very simple logger that tries to be concurrency-safe."""
-import os
+import os, sys
import subprocess
import time
import traceback
-LOG_FILE = '/root/node_mgr.log'
+LOG_FILE = '/var/log/nm'
+LOG_SLIVERS = '/var/log/getslivers.txt'
+
+# Thierry - trying to debug this for 4.2
+# basically define 3 levels
+LOG_NONE=0
+LOG_NODE=1
+LOG_VERBOSE=2
+# default is to log a reasonable amount of stuff for when running on operational nodes
+LOG_LEVEL=1
+
+def set_level(level):
+ global LOG_LEVEL
+ assert level in [LOG_NONE,LOG_NODE,LOG_VERBOSE]
+ LOG_LEVEL=level
+
+def verbose(msg):
+ log('(v) '+msg,LOG_VERBOSE)
-def log(msg):
- """Write <msg> to the log file."""
- fd = os.open(LOG_FILE, os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0600)
- if not msg.endswith('\n'): msg += '\n'
- os.write(fd, '%s: %s' % (time.asctime(time.gmtime()), msg))
- os.close(fd)
+def log(msg,level=LOG_NODE):
+ """Write <msg> to the log file if level >= current log level (default LOG_NODE)."""
+ if (level > LOG_LEVEL):
+ return
+ try:
+ fd = os.open(LOG_FILE, os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0600)
+ if not msg.endswith('\n'): msg += '\n'
+ os.write(fd, '%s: %s' % (time.asctime(time.gmtime()), msg))
+ os.close(fd)
+ except OSError:
+ sys.stderr.write(msg)
+ sys.stderr.flush()
def log_call(*args):
log('running command %s' % ' '.join(args))
- try: subprocess.call(args)
- except: log_exc()
+ try:
+ child = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
+ child.wait() # wait for proc to hang up
+ if child.returncode:
+ raise Exception("command failed:\n stdout - %s\n stderr - %s" % \
+ (child.stdout.readlines(), child.stderr.readlines()))
+ except: log_exc('failed to run command %s' % ' '.join(args))
-def log_exc():
+def log_exc(msg="",name=None):
"""Log the traceback resulting from an exception."""
- log(traceback.format_exc())
+ if name:
+ log("%s: EXCEPTION caught <%s> \n %s" %(name, msg, traceback.format_exc()))
+ else:
+ log("EXCEPTION caught <%s> \n %s" %(msg, traceback.format_exc()))
+
+# for some reason the various modules are still triggered even when the
+# data from PLC cannot be reached
+# we show this message instead of the exception stack instead in this case
+def log_missing_data (msg,key):
+ log("%s: could not find the %s key in data (PLC connection down?) - IGNORED"%(msg,key))
+
+def log_data_in_file (data, file, message=""):
+ import pprint, time
+ try:
+ f=open(file,'w')
+ now=time.strftime("Last update: %Y.%m.%d at %H:%M:%S %Z", time.localtime())
+ f.write(now+'\n')
+ if message: f.write('Message:'+message+'\n')
+ pp=pprint.PrettyPrinter(stream=f,indent=2)
+ pp.pprint(data)
+ f.close()
+ except:
+ log_verbose('log_data_in_file failed - file=%s - message=%r'%(file,message))
+
+def log_slivers (data):
+ log_data_in_file (data, LOG_SLIVERS, "raw GetSlivers")