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Host.backup.py
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Host.backup.py
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# Copyright (C) 2012-2020 MIPS Tech LLC
# Written by Matthew Fortune <[email protected]> and
# Daniel Sanders <[email protected]>
# This file is part of Overtest.
#
# Overtest 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, or (at your option)
# any later version.
#
# Overtest 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 overtest; see the file COPYING. If not, write to the Free
# Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
# 02110-1301, USA.
from utils import Utilities
import socket
import os
import Scheduler
import sys
import time
import TestManager
import signal
from Config import CONFIG
import getopt
from utils.Daemon import *
from OvertestExceptions import *
from LogManager import LogManager
# Global access to child pids
pidlist = {}
class Host:
"""
A host is a machine that can host tests. Hosts have attributes in the group:
'Overtest Host'
This class initialises a host and manages the process count.
"""
def __init__(self, ovtDB):
self.shuttingDown = False
self.ovtDB = ovtDB
self.log = LogManager(CONFIG.hostname, False)
self.ovtDB.registerLog(self.log)
self.pidfile = None
def getHostID(self):
"""
Return the host identified (a resource id)
"""
return self.hostid
def processRun(self, processNumber):
"""
The code to run a new worker process
"""
# Process code
signal.signal(signal.SIGTERM, signal.SIG_DFL)
signal.signal(signal.SIGHUP, signal.SIG_DFL)
self.log = LogManager("%s.%u"%(CONFIG.hostname, processNumber), False)
self.ovtDB.reconnect(quiet=True, log=self.log)
innerexception = None
try:
try:
scheduler = Scheduler.Scheduler(self, processNumber)
scheduler.run()
except Exception, e:
innerexception = formatExceptionInfo()
try:
self.ovtDB.FORCEROLLBACK()
except DatabaseRetryException, e:
self.ovtDB.reconnect()
self.ovtDB.setAutoCommit(True)
self.logDB(processNumber, innerexception)
self.log.write("%s: %s" % (time.asctime(),innerexception))
sys.exit(3)
except Exception, e:
if innerexception != None:
self.log.write("Exception while processing inner exception.")
self.log.write("Inner exception was:")
self.log.write(innerexception)
self.log.write(formatExceptionInfo())
sys.exit(4)
def startProcesses(self, processNumbers, pidlist):
"""
Start processes assigning them numbers from processNumbers
"""
for i in processNumbers:
pid = os.fork()
if pid != 0:
# I am the parent
pidlist[pid] = i
else:
# Start the process
self.processRun(i)
print "Should not see this"
sys.exit(0)
# DO NOT RETURN FOR THE CHILD PROCESS
break
def checkConcurrency(self, pidlist):
"""
Check the correct number of processes exist and start them
"""
details = self.ovtDB.getHostInfo(self.name)
if details['concurrency'] > len(pidlist):
processNumbers = range(0, details['concurrency'])
for PID in pidlist:
processNumbers.remove(pidlist[PID])
self.startProcesses(processNumbers, pidlist)
self.ovtDB.reconnect(quiet=True)
def termHandler(self, signum, frame):
"""
Handle a sigterm gracefully
"""
for pid in pidlist:
try:
os.kill(pid, signal.SIGTERM)
except Exception, e:
self.log.write(e)
self.shuttingDown = True
def run(self, name, args):
"""
Create the correct number of subprocesses and reconnect each of them to the
database.
Also handle any remaining exceptions and log them as status
"""
details = self.ovtDB.getHostInfo(name)
self.name = name
if details == None:
raise Exception, "Failed to find host: "+name
self.hostid = details['hostid']
self.hostname = details['hostname']
self.concurrency = details['concurrency']
if socket.gethostname() != self.hostname:
raise StartupException, "Host's hostname does not match this host: "+self.hostname + " != " +socket.gethostname()
if details['pid'] != None and \
Utilities.pid_exists(details['pid']) and \
details['pid'] != os.getpid():
raise StartupException, "Overtest daemon already running on this host: "+str(details['pid'])
status = self.ovtDB.getResourceStatus(self.hostid)
if status == "DISABLE" or status == "DISABLED":
self.ovtDB.setResourceStatus(self.hostid, "DISABLED")
raise StartupException, "Host is disabled"
try:
opts, args = getopt.getopt(args, "dp:", ["daemon","pidfile="])
except getopt.GetoptError, e:
raise StartupException, "Error parsing options: %s" % str(e)
self.daemon = False
self.pidfile = None
for (o,a) in opts:
if o in ("-d", "--daemon"):
self.daemon = True
elif o in ("-p", "--pidfile"):
self.pidfile = a
self.ovtDB.setResourceStatus(self.hostid, "OK")
self.logDB(0, "Host started");
signal.signal(signal.SIGTERM, self.termHandler)
signal.signal(signal.SIGHUP, signal.SIG_IGN)
signal.signal(signal.SIGUSR1, signal.SIG_IGN)
# This allows USR2 to be used to check if the process exists using kill -USR2 <me>
signal.signal(signal.SIGUSR2, signal.SIG_IGN)
try:
if self.daemon:
createDaemon()
except Exception, e:
raise StartupException, "Failed to daemonize: %s" % str(e)
# Driver code
CRASH = False
self.ovtDB.reconnect(quiet=True)
# Register the PID
self.ovtDB.setHostPID(self.hostid, os.getpid())
if self.pidfile != None:
fh = open(a, "w")
fh.write(str(os.getpid()))
fh.close()
# Perform cleanup from previous shutdown or crash
# Fetch all tasks running on this host (there is a dead+unheld request on this host)
# Fail all the tasks and report host crash as reason
# Mark all resource requests as dead
deadtasks = self.ovtDB.getRunningTasks (self.hostid)
for taskinfo in deadtasks:
(testrunid, testrunactionid, actionid, archived) = taskinfo
if archived == False:
self.ovtDB.resetArchived (testrunactionid)
# Use the testrun class to alter the testrun
testrun = TestManager.Testrun (self.ovtDB, testrunid=testrunid, logDB=lambda x: self.logDB(0, x))
success = False
while not success:
try:
self.ovtDB.setAutoCommit(False)
# Mark the testrunaction as failed because of a host failure
testrun.submit (actionid, False, {"__OVT_EXCEPT__":"Testrun failed due to Host Daemon crash"})
testrun.setTaskEnded (testrunactionid)
testrun.logHelper ("TRA: %u died due to host crash" % testrunactionid)
# Trigger an abort if not already in progress
testrun.setAborting (lock = True)
self.ovtDB.FORCECOMMIT()
success = True
self.ovtDB.setAutoCommit(True)
except DatabaseRetryException, e:
pass
processNumbers = range(0,self.concurrency)
self.startProcesses(processNumbers, pidlist)
# reconnect... again since the existing connection will have been terminated
# by the worker threads
self.ovtDB.reconnect(quiet=True)
hoststatus = self.ovtDB.getResourceStatus(self.hostid)
while len(pidlist) != 0 or self.concurrency == 0:
try:
interrupted = True
while interrupted:
try:
interrupted = False
hoststatus = self.ovtDB.getResourceStatus(self.hostid)
if self.concurrency == 0 and hoststatus != "OK":
break
(pid, status) = os.waitpid(0, os.WNOHANG)
if pid == 0:
time.sleep(1)
# When a thread crashes do not start new threads
if hoststatus == "OK" and not CRASH:
self.checkConcurrency(pidlist)
interrupted = True
except OSError, e:
if e.errno == 10:
time.sleep(1)
# When a thread crashes do not start new threads
if hoststatus == "OK" and not CRASH:
self.checkConcurrency(pidlist)
interrupted = True
if e.errno == 4:
interrupted = True
if self.concurrency == 0 and hoststatus != "OK":
break
signo = status & 0xFF
retval = status >> 8
if signo != 0 or retval != 0:
self.log.write("%s: Process %u with PID %u exited with signal %u and returned %u"%(time.asctime(),pidlist[pid], pid, signo, retval))
details = self.ovtDB.getHostInfo(self.name)
hoststatus = self.ovtDB.getResourceStatus(self.hostid)
self.concurrency = details['concurrency']
if signo != 0 or retval != 0:
# Exit code 1 ==> Process exited with keyboard interrupt
# Exit code 2 ==> Process exited due to sigterm, allow a new one to start unless
# this driver has been sent SIGTERM
if not retval in [0,1,2]:
self.log.write("%s: Process %u with PID %u may have crashed" % (time.asctime(),pidlist[pid], pid))
if retval != 2 or self.shuttingDown:
CRASH = True
del pidlist[pid]
except KeyboardInterrupt, e:
if self.concurrency == 0:
break
else:
continue
try:
if self.pidfile != None:
os.remove (self.pidfile)
except OSError:
pass
status = self.ovtDB.getResourceStatus(self.hostid)
if status == "OK":
self.logDB(0, "Shutdown Host");
self.ovtDB.setResourceStatus(self.hostid, "OFFLINE")
sys.exit(0)
elif status == "RESTART":
self.logDB(0, "Restarting Host");
self.ovtDB.setResourceStatus(self.hostid, "UPDATING")
# Close the database connection
del self.ovtDB
import commands
os.chdir(os.path.dirname(sys.argv[0]))
update_result = commands.getstatusoutput('P4CONFIG=.p4conf ' + CONFIG.p4 + " sync")
self.log.write(update_result[1])
# Close the log manager
del self.log
# Close all file handles
MAXFD = 1024
sys.path.pop(0)
import resource
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if maxfd == resource.RLIM_INFINITY:
maxfd = MAXFD
for fd in range (3, maxfd):
try:
os.close(fd)
except OSError:
pass
if update_result[0] == 0:
sys.argv.insert(0, CONFIG.python)
os.execv(CONFIG.python, sys.argv)
else:
sys.exit(3)
elif status == "DISABLE":
self.logDB(0, "Disabling Host");
self.ovtDB.setResourceStatus(self.hostid, "DISABLED")
sys.exit(4)
else:
self.logDB(0, "Exiting for unknown status: %s"%status)
sys.exit(5)
def logDB(self, threadnumber, message):
"""
Set the status for a given thread
"""
self.ovtDB.appendToResourceLog(self.hostid, message, index=threadnumber)
def logHelper(self, threadnumber, message):
"""
Log a message for a thread
"""
self.log.write("%s: T%u: %s"%(time.asctime(),threadnumber,message))
def shouldThreadExit(self, threadnumber):
"""
Decide if the specified thread should exit
"""
details = self.ovtDB.getHostInfo(self.name)
return threadnumber >= details['concurrency'] or self.ovtDB.getResourceStatus(self.hostid) != "OK"
def checkAbortedTestruns(self):
"""
returns a list of testruns ready to abort.
Grab the testrun lock and abort them all
"""
testruns = self.ovtDB.checkAbortedTestruns()
for testrunid in testruns:
success = False
while not success:
try:
self.ovtDB.setAutoCommit(False)
self.ovtDB.setTestrunRunstatus(testrunid, "ABORTED")
self.ovtDB.FORCECOMMIT()
success = True
self.ovtDB.setAutoCommit(True)
self.ovtDB.cancelAllResourceRequests(testrunid)
except DatabaseRetryException, e:
self.ovtDB.reconnect()
def getNextTestruns(self, logDB):
"""
Returns the set of testruns that this thread should try to execute next
"""
ret = []
for testrunid in self.ovtDB.getNextTestruns(self.hostid):
ret.append(TestManager.Testrun(self.ovtDB,testrunid=testrunid, logDB=logDB))
return ret
def getTestrunsToArchiveOrDelete(self, logDB):
"""
Returns the set of testruns that need to be archived (deletion implies archiving)
"""
ret = []
for testrunid in self.ovtDB.getTestrunsToArchiveOrDelete(self.hostid):
ret.append(TestManager.Testrun(self.ovtDB,testrunid=testrunid,logDB=logDB))
return ret