Add GPL license, logging facilities, refactored code

2 files changed, 993 insertions, 181 deletions

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/aprio.py b/aprio.py
index fcc4a78..41aec0e 100755
--- a/aprio.py
+++ b/aprio.py
@@ -1,196 +1,334 @@
 #!/usr/bin/env python
+#
+# aprio is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# aprio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with aprio.  If not, see <http://www.gnu.org/licenses/>.
+""" aprio stands for "Automatic Priority"
+"""
+
 import os
+import logging, logging.config
 import time
+from datetime import timedelta
+
+
 try:
-	import psutil
+    import psutil
 except ImportError:
-	print("psutil module not found!")
-	exit(1)
+    print("psutil module not found!")
+    exit(1)
 
 try:
-	import argparse
+    import daemon
 except ImportError:
-	print("argparse module not found!")
-	exit(1)
-
+    print("daemon module not found!")
+    exit(1)
 
-class Elapsed(object):
-	SECOND = 1
-	MINUTE = SECOND * 60
-	HOUR = MINUTE * 24
-	DAY = HOUR * 24
-	WEEK = DAY * 7
 
-LOAD_THRESHOLD=1
 try:
-	LOAD_THRESHOLD=psutil.cpu_count() / 2
-except:
-	LOAD_THRESHOLD=psutil.cpu_count()
-CPU_THRESHOLD=50.0
-CPUTIME_THRESHOLD=Elapsed.SECOND * 1
-POLL=3
-TEST_MODE=False
-VERBOSE=False
-QUITE=False
+    import argparse
+except ImportError:
+    print("argparse module not found!")
+    exit(1)
+
+
+class Transpire(object):
+    """Supply common time constants
+    """
+    def __init__(self):
+        self.second = timedelta(seconds=1).total_seconds()
+        self.minute = timedelta(minutes=1).total_seconds()
+        self.hour = timedelta(hours=1).total_seconds()
+        self.day = timedelta(days=1).total_seconds()
+        self.week = timedelta(weeks=1).total_seconds()
+        self.month = timedelta(weeks=4).total_seconds()
+
+
+ELAPSED = Transpire()
+CONFIG = {}
+CONFIG['LOAD_THRESHOLD'] = psutil.cpu_count() / 2
+if CONFIG['LOAD_THRESHOLD'] < 1:
+    CONFIG['LOAD_THRESHOLD'] = psutil.cpu_count()
+CONFIG['CPU_THRESHOLD'] = 50.0
+CONFIG['CPUTIME_THRESHOLD'] = ELAPSED.second
+CONFIG['POLL'] = 3
+CONFIG['TEST_MODE'] = False
+CONFIG['VERBOSE'] = False
+CONFIG['QUITE'] = False
+
 
 def renice(proc, nice_value=0):
-	nice_current = 255
-	try:
-		pid = proc.pid
-		nice_previous = proc.get_nice()
-		
-		if nice_previous < 0:
-			return
-
-		if nice_value <= nice_previous:
-			return
-
-		if not TEST_MODE:
-			proc.set_nice(nice_value)
-
-		if not TEST_MODE:
-			nice_current = proc.get_nice()
-		else:
-			nice_current = nice_value
-
-		print("PID: {0}: nice({1}) -> nice({2})".format(pid, nice_previous, nice_current))
-	except psutil.AccessDenied as e:
-		print("PID: {0}: {1}: Permission denied setting nice to {2}".format(pid, proc.username(), nice_value))
-	except psutil.NoSuchProcess as e:
-		return
-	return nice_current
-
-def time_to_nice(start_time):
-	nice = 0
-	diff = time.time() - start_time
-	if diff >= Elapsed.WEEK:
-		nice = 19
-	elif diff >= Elapsed.DAY:
-		nice = 15
-	elif diff >= Elapsed.DAY / 2:
-		nice = 11
-	elif diff >= Elapsed.HOUR:
-		nice = 9
-	elif diff >= Elapsed.HOUR / 2:
-		nice = 4
-	elif diff >= Elapsed.MINUTE:
-		nice = 2
-	elif diff >= Elapsed.MINUTE / 2:
-		nice = 1
-	
-	return nice	
-
-def cputime_to_nice(cpu_time):
-	nice = 0
-	time_user, time_system = cpu_time
-	diff = time_user + time_system
-	if diff >= Elapsed.WEEK:
-		nice = 19
-	elif diff >= Elapsed.DAY:
-		nice = 15
-	elif diff >= Elapsed.DAY / 2:
-		nice = 11
-	elif diff >= Elapsed.HOUR:
-		nice = 9
-	elif diff >= Elapsed.HOUR / 2:
-		nice = 4
-	elif diff >= Elapsed.MINUTE:
-		nice = 2
-	elif diff >= Elapsed.MINUTE / 2:
-		nice = 1
-		
-	return nice	
-
-def get_bad_processes(cpu_threshold=CPU_THRESHOLD, cputime_threshold=CPUTIME_THRESHOLD, *args, **kwargs):
-	user = ""
-	if kwargs.has_key('user'):
-		user = kwargs['user']
-
-	for proc in psutil.process_iter():
-		try:
-			pid = proc.pid
-			username = proc.username()
-			status = proc.status()
-			started = proc.create_time()
-			user_time, system_time = proc.cpu_times()
-			cputime_total = user_time + system_time
-			uid, euid, _ = proc.uids()
-
-			if uid == 0 or euid == 0:
-				continue
-
-
-			cpu = proc.get_cpu_percent(interval=0.05)
-			if cpu > cpu_threshold:
-				if VERBOSE:
-					print("PID: {0}: cpu_threshold exeeded ({1}% > {2}%)".format(pid, cpu, cpu_threshold))
-				if cputime_total > cputime_threshold:
-					if VERBOSE:
-						print("PID: {0}: cputime_threshold exceeded ({1} > {2})".format(pid, cputime_total, cputime_threshold))
-					if user:
-						if user != username:
-							continue
-					yield proc
-
-		except psutil.NoSuchProcess as e:
-			if VERBOSE:
-				print("PID: {0}: disappeared".format(e.pid))
+    """Change the process priority of a psutil.Process object
+    """
+    logger = logging.getLogger(__name__)
+    nice_current = 255
+    try:
+        pid = proc.pid
+        nice_previous = proc.get_nice()
+        
+        if nice_previous < 0:
+            return
+
+        if nice_value <= nice_previous:
+            return
+
+        if not CONFIG['TEST_MODE']:
+            proc.set_nice(nice_value)
+
+        if not CONFIG['TEST_MODE']:
+            nice_current = proc.get_nice()
+        else:
+            nice_current = nice_value
+
+        logger.info("{0}:Priority modified ({1} -> {2})"
+            .format(pid, nice_previous, nice_current))
+    except psutil.AccessDenied:
+        logger.warning("{0}:{1}:Permission denied setting nice to {2}"
+            .format(pid, proc.username(), nice_value))
+    except psutil.NoSuchProcess:
+        return
+    return nice_current
+
+
+def convert_nice(proc, **kwargs):
+    """Analyzes a process' total kernel time, or the time since the process
+    began.  If the time meets or exceeds a defined threshold, an
+    appropriate nice value will be applied to the process.
+
+    Keyword Arguments:
+    model -- (default 'relative')
+        'kernel' = Total CPU time accumulated
+        'relative' = Total time elapsed since process started
+    """
+    logger = logging.getLogger(__name__)
+    model = 'relative'
+    if kwargs.has_key('model'):
+        model = kwargs['model']
+
+    if model == 'kernel':
+        time_user, time_system = proc.cpu_times()  
+        total_time = time_user + time_system
+    elif model == 'relative':
+        total_time = time.time() - proc.create_time()
+    else:
+        raise ValueError('"{0}" is not a valid time model'.format(model))
+        
+    logger.debug('Time model "{0}"'.format(model))
+    nice = 0
+    if total_time >= ELAPSED.month:
+        nice = 20
+    elif total_time >= ELAPSED.week:
+        nice = 17
+    elif total_time >= ELAPSED.day:
+        nice = 15
+    elif total_time >= ELAPSED.day / 2:
+        nice = 11
+    elif total_time >= ELAPSED.hour:
+        nice = 9
+    elif total_time >= ELAPSED.hour / 2:
+        nice = 4
+    elif total_time >= ELAPSED.minute:
+        nice = 2
+    elif total_time >= ELAPSED.minute / 2:
+        nice = 1
+    
+    return nice 
+
+
+def filter_processes(cpu_threshold=CONFIG['CPU_THRESHOLD'],
+                    cputime_threshold=CONFIG['CPUTIME_THRESHOLD'],
+                    **kwargs):
+    """Yield a filtered process list matching system usage criteria.
+    
+    Keyword ARGUMENTS:
+    cpu_threshold -- must exceed CPU% (default 50.0)
+    cputime_threshold -- must exceed CPU TIME in seconds (default 1.0)
+    user -- yield processes owned by a particular account
+    """
+    logger = logging.getLogger(__name__)
+    user = ""
+    if kwargs.has_key('user'):
+        user = kwargs['user']
+
+    for proc in psutil.process_iter():
+        try:
+            pid = proc.pid
+            username = proc.username()
+            user_time, system_time = proc.cpu_times()
+            cputime_total = user_time + system_time
+            uid, euid, _ = proc.uids()
+
+            if uid == 0 or euid == 0:
+                continue
+
+
+            cpu = proc.get_cpu_percent(interval=0.05)
+            if cpu > cpu_threshold:
+                logger.debug("{0}:cpu_threshold ({1}% > {2}%)"
+                    .format(pid, cpu, cpu_threshold))
+                if cputime_total > cputime_threshold:
+                    logger.debug("{0}:cputime_threshold ({1} > {2})"
+                        .format(pid, cputime_total, cputime_threshold))
+                    if user:
+                        if user != username:
+                            continue
+                    yield proc
+
+        except psutil.NoSuchProcess as ex:
+            logger.debug("{0}:disappeared".format(ex.pid))
+
+
+def main(args):
+    """ Poll system for bad processes
+    """
+    logger = logging.getLogger(__name__)
+    CONFIG['POLL'] = args.poll
+    CONFIG['VERBOSE'] = args.verbose
+    CONFIG['QUIET'] = args.quiet
+    CONFIG['TEST_MODE'] = args.test
+    CONFIG['CPU_THRESHOLD'] = args.cpu_threshold
+    CONFIG['CPUTIME_THRESHOLD'] = args.cputime_threshold
+    CONFIG['LOAD_THRESHOLD'] = args.load_threshold
+    CONFIG['DAEMON'] = args.daemon
+    user = args.user
+    
+    
+    load_sleep = False
+    load_warn = False
+
+    while(True):
+        load = os.getloadavg()
+        load = sum(load) / len(load)
+        if load < CONFIG['LOAD_THRESHOLD']:
+            load_sleep = True
+            load_warn = False
+            if load_sleep:
+                logger.debug("load_threshold nominal ({0} < {1})"
+                    .format(load, CONFIG['LOAD_THRESHOLD']))
+            load_sleep = False
+            time.sleep(CONFIG['POLL'])
+            continue
+        else:
+            load_warn = True
+
+        if load_warn:
+            logger.debug("load_threshold exceeded ({0} > {1})"
+                .format(load, CONFIG['LOAD_THRESHOLD']))
+
+        for bad in filter_processes(CONFIG['CPU_THRESHOLD'],
+                                    CONFIG['CPUTIME_THRESHOLD'],
+                                    user=user):
+            try:
+                nice = convert_nice(bad, model='kernel')
+
+                if not nice:
+                    nice = convert_nice(bad)
+
+                if nice != 0:
+                    renice(bad, nice)
+
+            except psutil.NoSuchProcess:
+                continue
+        time.sleep(CONFIG['POLL'])
+
 
 if __name__ == "__main__":
-	parser = argparse.ArgumentParser()
-	parser.add_argument('--user', '-u', default="", type=str, help='Limit to specific user')	
-	parser.add_argument('--cpu-threshold', '-c', default=CPU_THRESHOLD, type=float, help='Trigger after n%%')
-	parser.add_argument('--cputime-threshold', '-t', default=CPUTIME_THRESHOLD, type=float, help='Trigger after n%%')
-	parser.add_argument('--load-threshold', '-l', default=LOAD_THRESHOLD, type=float, help='Trigger after n load average')
-	parser.add_argument('--poll', '-p', default=POLL, type=float, help='Wait n seconds between polling processes')
-	parser.add_argument('--test', '-T', action='store_true', default=False, help='Do not modify processes; report only.')
-	parser.add_argument('--verbose', '-v', action='store_true', default=False, help='Verbose output')
-	parser.add_argument('--quiet', '-q', action='store_true', default=False, help='Suppress output')
-	
-	args = parser.parse_args()
-
-	POLL = args.poll
-	VERBOSE = args.verbose
-	QUIET = args.quiet
-	TEST_MODE = args.test
-	CPU_THRESHOLD = args.cpu_threshold
-	CPUTIME_THRESHOLD = args.cputime_threshold
-	LOAD_THRESHOLD = args.load_threshold
-	user = args.user
-	
-	
-	load_sleep = False
-	load_warn = False
-
-	while(True):
-		load = os.getloadavg()
-		load = sum(load) / len(load)
-		if load < LOAD_THRESHOLD:
-			load_sleep = True
-			load_warn = False
-			if load_sleep:
-				if VERBOSE:
-					print("SYS: load_threshold nominal, sleeping ({0} < {1})".format(load, LOAD_THRESHOLD))
-			load_sleep = False
-			time.sleep(POLL)
-			continue
-		else:
-			load_warn = True
-
-		if load_warn:
-			if VERBOSE:
-				print("SYS: load_threshold exceeded ({0} > {1})".format(load, LOAD_THRESHOLD))
-
-		for bad in get_bad_processes(CPU_THRESHOLD, CPUTIME_THRESHOLD, user=user):
-			try:
-				nice = cputime_to_nice(bad.cpu_times())
-
-				if not nice:
-					nice = time_to_nice(bad.create_time())
-
-				if nice != 0:
-		  			renice(bad, nice)
-
-			except psutil.NoSuchProcess:
-				continue
-		time.sleep(POLL)
+
+    PARSER = argparse.ArgumentParser()
+    PARSER.add_argument('--daemon',
+        '-d',
+        action='store_true',
+        help="Fork into background")
+
+    PARSER.add_argument('--logfile',
+        '-L',
+        action='store',
+        default="",
+        type=str,
+        help="Log output to filename")
+
+    PARSER.add_argument('--user',
+        '-u',
+        default="",
+        type=str,
+        help='Limit to specific user')    
+
+    PARSER.add_argument('--cpu-threshold',
+        '-c',
+        default=CONFIG['CPU_THRESHOLD'],
+        type=float,
+        help='Trigger after n%%')
+
+    PARSER.add_argument('--cputime-threshold',
+        '-t',
+        default=CONFIG['CPUTIME_THRESHOLD'],
+        type=float,
+        help='Trigger after n%%')
+
+    PARSER.add_argument('--load-threshold',
+        '-l',
+        default=CONFIG['LOAD_THRESHOLD'],
+        type=float,
+        help='Trigger after n load average')
+
+    PARSER.add_argument('--poll',
+        '-p',
+        default=CONFIG['POLL'],
+        type=float,
+        help='Wait n seconds between polling processes')
+
+    PARSER.add_argument('--test',
+        '-T',
+        action='store_true',
+        default=False,
+        help='Do not modify processes; report only.')
+
+    PARSER.add_argument('--verbose',
+        '-v',
+        action='store_true',
+        default=False,
+        help='Verbose output')
+
+    PARSER.add_argument('--quiet',
+        '-q',
+        action='store_true',
+        default=False,
+        help='Suppress output')
+    
+    ARGUMENTS = PARSER.parse_args()
+
+    FORMAT = "%(levelname)s:%(asctime)s:%(funcName)s:%(message)s"
+    if ARGUMENTS.logfile:
+        logging.basicConfig(filename=os.path.abspath(ARGUMENTS.logfile),
+            format=FORMAT)
+    else:
+        logging.basicConfig(format=FORMAT) 
+
+    logging.basicConfig(level=logging.INFO)
+    LOGGER = logging.getLogger(__name__)
+    LOGGER.setLevel(logging.INFO)
+
+     
+    if ARGUMENTS.verbose:
+        LOGGER.setLevel(logging.DEBUG)
+
+    if ARGUMENTS.test:
+        LOGGER.debug('Test mode (processes will not be modified)')
+    
+    if ARGUMENTS.daemon:
+        LOGGER.debug('Daemon mode')
+        with daemon.DaemonContext():
+            main(ARGUMENTS)
+    else:
+        LOGGER.debug('Foreground mode')
+        main(ARGUMENTS)
+