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[saartuer.git] / libtuer.py

diff --git a/libtuer.py b/libtuer.py
index a655fcd2858f275c937ed2444f40737082451fa9..c9eceec42fa99ae4537563a62002300516485f86 100644 (file)
--- a/libtuer.py
+++ b/libtuer.py
@@ -1,21 +1,148 @@
-import logging, logging.handlers, syslog, os
+import logging, logging.handlers, os, time, queue, threading, subprocess
+import traceback, smtplib
+import email.mime.text, email.utils
+
+# Logging configuration
+syslogLevel = logging.INFO
+mailLevel   = logging.CRITICAL # must be "larger" than syslog level!
+from config import mailAddress
+printLevel  = logging.DEBUG
+
+# Mail logging handler
+def sendeMail(subject, text, receivers, sender='sphinx@hacksaar.de', replyTo=None):
+       assert isinstance(receivers, list)
+       if not len(receivers): return # nothing to do
+       # construct content
+       msg = email.mime.text.MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8')
+       msg['Subject'] = subject
+       msg['Date'] = email.utils.formatdate(localtime=True)
+       msg['From'] = sender
+       msg['To'] = ', '.join(receivers)
+       if replyTo is not None:
+               msg['Reply-To'] = replyTo
+       # put into envelope and send
+       s = smtplib.SMTP('localhost')
+       s.sendmail(sender, receivers, msg.as_string())
+       s.quit()

 
 # logging function
 class Logger:
        def __init__ (self):
 
 # logging function
 class Logger:
        def __init__ (self):

-               import __main__ as main
-               self.name = os.path.basename(main.__file__)
-               self.logger = logging.getLogger(self.name)
-               self.logger.setLevel(logging.INFO)
-               self.handler = logging.handlers.SysLogHandler(address = '/dev/log', facility = logging.handlers.SysLogHandler.LOG_LOCAL0)
-               self.logger.addHandler(self.handler)
-       def log (self, what):
-               thestr = "%s[%d]: %s" % (self.name,os.getpid(),what)
-               print (thestr)
-               self.logger.info(thestr)
+               self.syslog = logging.getLogger("tuerd")
+               self.syslog.setLevel(logging.DEBUG)
+               self.syslog.addHandler(logging.handlers.SysLogHandler(address = '/dev/log',
+                                                                                                               facility = logging.handlers.SysLogHandler.LOG_LOCAL0))
+       
+       def _log (self, lvl, what):
+               thestr = "%s[%d]: %s" % ("tuerd", os.getpid(), what)
+               # console log
+               if lvl >= printLevel:
+                       print(thestr)
+               # syslog
+               if lvl >= syslogLevel:
+                       self.syslog.log(lvl, thestr)
+               # mail log
+               if lvl >= mailLevel and mailAddress is not None:
+                       sendeMail('Kritischer Türfehler', what, mailAddress)
+       
+       def debug(self, what):
+               self._log(logging.DEBUG, what)
+       def info(self, what):
+               self._log(logging.INFO, what)
+       def warning(self, what):
+               self._log(logging.WARNING, what)
+       def error(self, what):
+               self._log(logging.ERROR, what)
+       def critical(self, what):
+               self._log(logging.CRITICAL, what)

 
 logger = Logger()
 
 
 logger = Logger()
 

-def log (what):
-       logger.log(what)
- 
+# run a Python command asynchronously
+def fire_and_forget(f):
+       def _fire_and_forget():
+               try:
+                       f()
+               except Exception as e:
+                       logger.critical("fire_and_forget: Got exception out of callback: %s" % str(e))
+                       logger.debug(traceback.format_exc())
+       t = threading.Thread(target=_fire_and_forget)
+       t.start()
+
+# run a command asynchronously and log the return value if not 0
+# prefix must be a string identifying the code position where the call came from
+def fire_and_forget_cmd (cmd, log_prefix):
+       logger.debug("Firing and forgetting command from %s: %s" % (log_prefix,str(cmd)))
+       def _fire_and_forget_cmd ():
+               with open("/dev/null", "w") as fnull:
+                       retcode = subprocess.call(cmd, stdout=fnull, stderr=fnull)
+                       if retcode is not 0:
+                               logger.error("%sReturn code %d at command: %s" % (log_prefix,retcode,str(cmd)))
+       fire_and_forget(_fire_and_forget_cmd)
+
+# Threaded callback class
+class ThreadFunction():
+       _CALL = 0
+       _TERM = 1
+       
+       def __init__(self, f, name):
+               self.name = name
+               self._f = f
+               self._q = queue.Queue()
+               self._t = threading.Thread(target=self._thread_func)
+               self._t.start()
+       
+       def _thread_func(self):
+               while True:
+                       (cmd, data) = self._q.get()
+                       # run command
+                       if cmd == ThreadFunction._CALL:
+                               try:
+                                       self._f(*data)
+                               except Exception as e:
+                                       logger.critical("ThreadFunction: Got exception out of handler thread %s: %s" % (self.name, str(e)))
+                                       logger.debug(traceback.format_exc())
+                       elif cmd == ThreadFunction._TERM:
+                               assert data is None
+                               break
+                       else:
+                               logger.error("ThreadFunction: Command %d does not exist" % cmd)
+       
+       def __call__(self, *arg):
+               self._q.put((ThreadFunction._CALL, arg))
+       
+       def stop(self):
+               # empty the queue
+               try:
+                       while True:
+                               self._q.get_nowait()
+               except queue.Empty:
+                       pass
+               # now wait till the job-in-progress is done
+               self._q.put((ThreadFunction._TERM, None))
+               self._t.join()
+
+# Thread timer-repeater class: Call a function every <sleep_time> seconds
+class ThreadRepeater():
+       def __init__(self, f, sleep_time, name):
+               self.name = name
+               self._f = f
+               self._stop = False
+               self._sleep_time = sleep_time
+               self._t = threading.Thread(target=self._thread_func)
+               self._t.start()
+       
+       def _thread_func(self):
+               while True:
+                       if self._stop:
+                               break
+                       try:
+                               self._f()
+                       except Exception as e:
+                               logger.critical("ThreadRepeater: Got exception out of handler thread %s: %s" % (self.name, str(e)))
+                               logger.debug(traceback.format_exc())
+                       time.sleep(self._sleep_time)
+       
+       def stop(self):
+               self._stop = True
+               self._t.join()