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#!/usr/bin/python3
###############################################################################
##
## Copyright (C) 2014-2016, New York University.
## Copyright (C) 2011-2014, NYU-Poly.
## Copyright (C) 2006-2011, University of Utah.
## All rights reserved.
## Contact: contact@vistrails.org
##
## This file is part of VisTrails.
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## - Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## - Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
## - Neither the name of the New York University nor the names of its
## contributors may be used to endorse or promote products derived from
## this software without specific prior written permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
## THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
## PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
## CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
## EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
## PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
## OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
## WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
## OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
## ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
###############################################################################
import xmlrpc.client
import os
from subprocess import Popen, PIPE
from time import sleep
import smtplib
from email.mime.text import MIMEText
import logging
import logging.handlers
class VistrailWatcher(object):
"""
A class for watching the status of VisTrail Servers running on a machine
Servers are pinged and if one down, it is restarted
"""
def __init__(self, server, email_addresses, root_virtual_display=None):
self.server = server
self.root_virtual_display = root_virtual_display
self.email_addresses = email_addresses
self.sender = "vistrails_server_watcher@%s" % server
self.proxies = {}
self.is_down = {}
self.logger = self.make_logger("vt_watcher.log")
# find running VisTrails servers
proc1 = Popen(["ps", "-eaf"], stdout = PIPE)
proc2 = Popen(["grep", "vistrails_server"], stdin=proc1.stdout, stdout=PIPE)
proc3 = Popen(["awk", "{print $13}"], stdin=proc2.stdout, stdout=PIPE)
out, err = proc3.communicate()
# get the status servers ports (1 less than normal vt server port)
out = out.strip().split('\n')
self.ports = [int(x)-1 for x in out[1:]] # exclude multithreaded inst.
# create proxies
for port in self.ports:
self.proxies[port] = xmlrpc.client.ServerProxy("http://%s:%d" % \
(self.server, port))
self.is_down[port] = False
def make_logger(self, filename):
""" create logger instance with log file rotation """
logger = logging.getLogger("VistrailsWatcher")
handler = logging.handlers.RotatingFileHandler(filename,
maxBytes = 1024*1024,
backupCount=5)
handler.setFormatter(logging.Formatter('VT Watcher- %(asctime)s '
'%(levelname)-8s %(message)s'))
handler.setLevel(logging.DEBUG)
logger.setLevel(logging.DEBUG)
logger.addHandler(handler)
return logger
def send_email(self, msg):
""" send email notification that server is down """
if not self.email_addresses:
return
# Create a text/plain message
msg = MIMEText(msg)
msg['Subject'] = '%s VisTrails Server Down' % self.server
msg['From'] = self.sender
msg['To'] = ', '.join(self.email_addresses)
# Send the message via our own SMTP server, but don't include the
# envelope header.
s = smtplib.SMTP('localhost')
s.sendmail(self.sender, self.email_addresses, msg.as_string())
s.quit()
def restart_instance(self, port):
""" restart VisTrails Single Tread instance on given port """
self.logger.info("restarting server on port %s" % port)
script = os.path.join("/server/vistrails/git/scripts",
"start_vistrails_xvfb.sh")
instance_virtual_display = self.root_virtual_display + \
self.ports.index(port) + 1
args = [script,":%s" % instance_virtual_display,
self.server, str(port+1), '0', '0']
try:
Popen(args)
sleep(20)
except Exception as e:
self.logger.error("Couldn't start the instance on display:"
"%s port: %s") % (instance_virtual_display, port)
self.logger.error(str(e))
def watch(self):
""" ping Single Thread VisTrail servers every 5 mins """
if not self.ports:
self.logger.info("no running instances found")
print("no running instances found")
return
self.logger.info("watching %s" % str(self.ports))
while 1:
for port in self.ports:
try:
if not self.proxies[port].try_ping():
if not self.is_down[port]:
# first time down, send email
self.send_email("%s:%d is down" % (self.server, port))
self.logger.info("%s:%d is down" % (self.server, port))
self.restart_instance(port)
self.is_down[port] = True
else:
if self.is_down[port]:
self.logger.info("%s:%d is back up" % (self.server, port))
self.is_down[port] = False
except Exception as e:
if not self.is_down[port]:
# first time down, send email
self.send_email("%s:%d is down" % (self.server, port))
self.logger.info("%s:%d is down" % (self.server, port))
self.restart_instance(port)
self.is_down[port] = True
sleep(60*5)
if __name__ == '__main__':
vt_watcher = VistrailWatcher("vis-7.sci.utah.edu", ["phillipmates@gmail.com"], root_virtual_display = 6)
vt_watcher.watch()
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