-#
-# Something relevant
-#
+# $Id$
+# $URL$
+
"""A very simple logger that tries to be concurrency-safe."""
import os, sys
LOG_LEVEL=level
def verbose(msg):
- log(msg,LOG_VERBOSE)
+ log('(v) '+msg,LOG_VERBOSE)
def log(msg,level=LOG_NODE):
"""Write <msg> to the log file if level >= current log level (default LOG_NODE)."""
def log_call(*args):
log('running command %s' % ' '.join(args))
- try: subprocess.call(args, close_fds=True)
- 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(name = None):
+def log_exc(msg="",name=None):
"""Log the traceback resulting from an exception."""
- if name:
- log("operation on %s failed. \n %s" %(name, traceback.format_exc()))
+ if name:
+ log("%s: EXCEPTION caught <%s> \n %s" %(name, msg, traceback.format_exc()))
else:
- log(traceback.format_exc())
+ log("EXCEPTION caught <%s> \n %s" %(msg, traceback.format_exc()))
-def log_slivers (data):
+# 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(LOG_SLIVERS,'w')
- now=time.strftime("GetSlivers stored on %Y.%m.%d at %H:%M:%S", time.localtime())
+ 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('Cannot save GetSlivers in %s'%LOG_SLIVERS)
+ 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")