-# $Id$
-# $URL$
"""A very simple logger that tries to be concurrency-safe."""
import subprocess
import select
-LOG_FILE = '/var/log/nm'
-LOG_SLIVERS = '/var/log/getslivers.txt'
+LOG_FILE = '/var/log/nodemanager'
+LOG_SLIVERS = '/var/lib/nodemanager/getslivers.txt'
+LOG_DATABASE = '/var/lib/nodemanager/database.txt'
-# Thierry - trying to debug this for 4.2
# basically define 3 levels
LOG_NONE=0
LOG_NODE=1
sys.stderr.write(msg)
sys.stderr.flush()
-#################### child processes
-# avoid waiting until the process returns;
-# that makes debugging of hanging children hard
-
-# time out in seconds - avoid hanging subprocesses - default is 5 minutes
-default_timeout_minutes=5
-
-def log_call(command,timeout=default_timeout_minutes*60,poll=0.3):
- log('log_call: running command %s' % ' '.join(command))
- verbose('log_call: timeout %r s' % timeout)
- verbose('log_call: poll %r s' % poll)
- trigger=time.time()+timeout
- try:
- child = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
- while True:
- # see if anything can be read within the poll interval
- (r,w,x)=select.select([child.stdout,child.stderr],[],[],poll)
- # read and log it
- for fd in r:
- input=fd.read()
- if input: log(input)
- # is process over ?
- returncode=child.poll()
- # yes
- if returncode != None:
- # child is done and return 0
- if returncode == 0:
- verbose('log_call: command completed %s' % ' '.join(command))
- break
- # child has failed
- else:
- raise Exception("log_call: failed with returncode %d"%returncode)
- # no : still within timeout ?
- if time.time() >= trigger:
- child.terminate()
- raise Exception("log_call: terminated command - exceeded timeout %d s"%timeout)
- except: log_exc('failed to run command %s' % ' '.join(command))
-
def log_exc(msg="",name=None):
"""Log the traceback resulting from an exception."""
- if name:
+ 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()))
+########## snapshot data to a file
# 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=""):
+def log_data_in_file (data, file, message="",level=LOG_NODE):
+ if (level > LOG_LEVEL):
+ return
import pprint, time
try:
f=open(file,'w')
pp=pprint.PrettyPrinter(stream=f,indent=2)
pp.pprint(data)
f.close()
+ verbose("logger:.log_data_in_file Owerwrote %s"%file)
except:
- log_verbose('log_data_in_file failed - file=%s - message=%r'%(file,message))
+ log_exc('logger.log_data_in_file failed - file=%s - message=%r'%(file,message))
def log_slivers (data):
log_data_in_file (data, LOG_SLIVERS, "raw GetSlivers")
+def log_database (db):
+ log_data_in_file (db, LOG_DATABASE, "raw database")
+
+#################### child processes
+# avoid waiting until the process returns;
+# that makes debugging of hanging children hard
+
+class Buffer:
+ def __init__ (self,message='log_call: '):
+ self.buffer=''
+ self.message=message
+
+ def add (self,c):
+ self.buffer += c
+ if c=='\n': self.flush()
+
+ def flush (self):
+ if self.buffer:
+ log (self.message + self.buffer)
+ self.buffer=''
+
+# time out in seconds - avoid hanging subprocesses - default is 5 minutes
+default_timeout_minutes=5
+
+# returns a bool that is True when everything goes fine and the retcod is 0
+def log_call(command,timeout=default_timeout_minutes*60,poll=1):
+ message=" ".join(command)
+ log("log_call: running command %s" % message)
+ verbose("log_call: timeout=%r s" % timeout)
+ verbose("log_call: poll=%r s" % poll)
+ trigger=time.time()+timeout
+ result = False
+ try:
+ child = subprocess.Popen(command, bufsize=1,
+ stdout=subprocess.PIPE, stderr=subprocess.STDOUT, close_fds=True)
+ buffer = Buffer()
+ while True:
+ # see if anything can be read within the poll interval
+ (r,w,x)=select.select([child.stdout],[],[],poll)
+ if r: buffer.add(child.stdout.read(1))
+ # is process over ?
+ returncode=child.poll()
+ # yes
+ if returncode != None:
+ buffer.flush()
+ # child is done and return 0
+ if returncode == 0:
+ log("log_call:end command (%s) completed" % message)
+ result=True
+ break
+ # child has failed
+ else:
+ log("log_call:end command (%s) returned with code %d" %(message,returncode))
+ break
+ # no : still within timeout ?
+ if time.time() >= trigger:
+ buffer.flush()
+ child.terminate()
+ log("log_call:end terminating command (%s) - exceeded timeout %d s"%(message,timeout))
+ break
+ except: log_exc("failed to run command %s" % message)
+ return result
git://git.onelab.eu / nodemanager.git / blobdiff