X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=logger.py;h=b38c872b13760715c5c7e5ae23fd37c6e61340ad;hb=ecee05390277f57b02d21ffca0195292bde1defa;hp=6add200eb1320351ca9f6bef1e9ab382be73b328;hpb=3504ab392e535f476ca463954afcf0b3c80bdc99;p=nodemanager.git

diff --git a/logger.py b/logger.py
index 6add200..b38c872 100644
--- a/logger.py
+++ b/logger.py
@@ -1,18 +1,38 @@
-#
-# Something relevant
-#
+
 """A very simple logger that tries to be concurrency-safe."""
 
 import os, sys
-import subprocess
 import time
 import traceback
+import subprocess
+import select
 
+LOG_FILE    = '/var/log/nodemanager'
+LOG_SLIVERS = '/var/lib/nodemanager/getslivers.txt'
+LOG_DATABASE = '/var/lib/nodemanager/database.txt'
 
-LOG_FILE = '/var/log/nm'
+# 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=LOG_NODE
 
-def log(msg):
-    """Write <msg> to the log file."""
+def set_level(level):
+    global LOG_LEVEL
+    try:
+        assert level in [LOG_NONE,LOG_NODE,LOG_VERBOSE]
+        LOG_LEVEL=level
+    except:
+        logger.log("Failed to set LOG_LEVEL to %s"%level)
+
+def verbose(msg):
+    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)."""
+    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'
@@ -22,11 +42,110 @@ def log(msg):
         sys.stderr.write(msg)
         sys.stderr.flush()
 
-def log_call(*args):
-    log('running command %s' % ' '.join(args))
-    try: subprocess.call(args, close_fds=True)
-    except: log_exc()
+date_width=24
+def log_exc(msg="",name=None):
+    """Log traceback resulting from an exception."""
+    printout=""
+    if name: printout += "%s: "%name
+    printout += "EXCEPTION caught <%s> \n" %msg
+    for frame in traceback.format_exc().split("\n"):
+        printout+=(date_width+2)*" "+"%s\n"%frame
+    log(printout)
+
+def log_trace(msg="",name=None):
+    """Log current stack"""
+    printout=""
+    if name: printout += "%s: "%name
+    printout += "LOGTRACE\n"
+    for frame in traceback.format_stack():
+        printout += "..."+frame
+    log(printout)
+
+
+########## 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_exc(name = None):
-    """Log the traceback resulting from an exception."""
-    log("operation on %s failed.  \n %s" %(self.name, traceback.format_exc()))
+def log_data_in_file (data, file, message="",level=LOG_NODE):
+    if (level > LOG_LEVEL):
+        return
+    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()
+        verbose("logger:.log_data_in_file Owerwrote %s"%file)
+    except:
+        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