# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from .cloudException import CloudRuntimeException, formatExceptionInfo
import logging
from subprocess import PIPE, Popen
from signal import alarm, signal, SIGALRM, SIGKILL
import sys
import os
class bash:
 def __init__(self, args, timeout=600):
 self.args = args
 logging.debug("execute:%s"%args)
 self.timeout = timeout
 self.process = None
 self.success = False
 self.run()

 def run(self):
 class Alarm(Exception):
 pass
 def alarm_handler(signum, frame):
 raise Alarm

 try:
 self.process = Popen(self.args, shell=True, stdout=PIPE, stderr=PIPE)
 if self.timeout != -1:
 signal(SIGALRM, alarm_handler)
 alarm(self.timeout)

 try:
 self.stdout, self.stderr = self.process.communicate()
 if self.timeout != -1:
 alarm(0)
 except Alarm:
 os.kill(self.process.pid, SIGKILL)
 raise CloudRuntimeException("Timeout during command execution")

 self.success = self.process.returncode == 0
 except:
 raise CloudRuntimeException(formatExceptionInfo())

 if not self.success:
 logging.debug("Failed to execute:" + self.getErrMsg())

 def isSuccess(self):
 return self.success

 def getStdout(self):
 return self.stdout.decode('utf-8').strip('\n')

 def getLines(self):
 return self.stdout.decode('utf-8').strip('\n')

 def getStderr(self):
 return self.stderr.decode('utf-8').strip('\n')

 def getErrMsg(self):
 if self.isSuccess():
 return ""

 if self.getStderr() is None or self.getStderr() == "":
 return self.getStdout()
 else:
 return self.getStderr()

def initLoging(logFile=None):
 try:
 if logFile is None:
 logging.basicConfig(level=logging.DEBUG)
 else:
 logging.basicConfig(filename=logFile, level=logging.DEBUG)
 except:
 logging.basicConfig(level=logging.DEBUG)

def writeProgressBar(msg, result):
 output = "[%-6s]\n"%"Failed"
 if msg is not None:
 output = "%-30s"%msg
 elif result is True:
 output = "[%-2s]\n"%"OK"
 elif result is False:
 output = "[%-6s]\n"%"Failed"
 sys.stdout.write(output)
 sys.stdout.flush()

class UnknownSystemException(Exception):
 "This Excption is raised if the current operating enviornment is unknown"
 pass

class Distribution:
 def __init__(self):
 self.distro = "Unknown"
 self.release = "Unknown"

 if os.path.exists("/etc/fedora-release"):
 self.distro = "Fedora"
 elif os.path.exists("/etc/redhat-release"):
 version = open("/etc/redhat-release").readline()
 if (version.find("Red Hat Enterprise Linux Server release 6") != -1 or version.find("Scientific Linux release 6") != -1 or
 version.find("CentOS Linux release 6") != -1 or version.find("CentOS release 6.") != -1):
 self.distro = "RHEL6"
 elif (version.find("Red Hat Enterprise Linux Server release 7") != -1 or version.find("Scientific Linux release 7") != -1 or
 version.find("CentOS Linux release 7") != -1 or version.find("CentOS release 7.") != -1):
 self.distro = "RHEL7"
 elif (version.find("Red Hat Enterprise Linux Server release 8") != -1 or version.find("Scientific Linux release 8") != -1 or
 version.find("CentOS Linux release 8") != -1 or version.find("CentOS release 8.") != -1 or
 version.find("Linux release 8") != -1):
 self.distro = "RHEL8"
 elif version.find("CentOS") != -1:
 self.distro = "CentOS"
 else:
 self.distro = "RHEL5"
 elif os.path.exists("/etc/legal") and "Ubuntu" in open("/etc/legal").read(-1):
 self.distro = "Ubuntu"
 kernel = bash("uname -r").getStdout()
 if kernel.find("2.6.32") != -1:
 self.release = "10.04"
 self.arch = bash("uname -m").getStdout()
 elif os.path.exists("/usr/bin/lsb_release"):
 o = bash("/usr/bin/lsb_release -i")
 distributor = o.getStdout().split(":\t")[1]
 if "Debian" in distributor:
 # This obviously needs a rewrite at some point
 self.distro = "Ubuntu"
 else:
 raise UnknownSystemException(distributor)
 elif os.path.exists("/etc/os-release"):
 version = open("/etc/os-release").readline()
 distributor = version.split("=")[1].replace('"', '').strip()
 if "SUSE" in distributor or "SLES" in distributor:
 self.distro = "SUSE"
 else:
 raise UnknownSystemException(distributor)
 else:
 raise UnknownSystemException

 def getVersion(self):
 return self.distro
 def getRelease(self):
 return self.release
 def getArch(self):
 return self.arch


class serviceOps:
 pass
class serviceOpsRedhat(serviceOps):
 def isServiceRunning(self, servicename):
 try:
 o = bash("service " + servicename + " status")
 if "running" in o.getStdout() or "start" in o.getStdout() or "Running" in o.getStdout():
 return True
 else:
 return False
 except:
 return False

 def stopService(self, servicename,force=False):
 if self.isServiceRunning(servicename) or force:
 return bash("service " + servicename +" stop").isSuccess()

 return True
 def disableService(self, servicename):
 result = self.stopService(servicename)
 bash("chkconfig --del " + servicename)
 return result

 def startService(self, servicename,force=False):
 if not self.isServiceRunning(servicename) or force:
 return bash("service " + servicename + " start").isSuccess()
 return True

 def enableService(self, servicename,forcestart=False):
 bash("chkconfig --level 2345 " + servicename + " on")
 return self.startService(servicename,force=forcestart)

 def isKVMEnabled(self):
 if os.path.exists("/dev/kvm"):
 return True
 else:
 return False

class serviceOpsUbuntu(serviceOps):
 def isServiceRunning(self, servicename):
 try:
 o = bash("sudo /usr/sbin/service " + servicename + " status")
 if "not running" in o.getStdout():
 return False
 else:
 return True
 except:
 return False

 def stopService(self, servicename,force=True):
 if self.isServiceRunning(servicename) or force:
 return bash("sudo /usr/sbin/service " + servicename +" stop").isSuccess()

 def disableService(self, servicename):
 result = self.stopService(servicename)
 bash("sudo update-rc.d -f " + servicename + " remove")
 return result

 def startService(self, servicename,force=True):
 if not self.isServiceRunning(servicename) or force:
 return bash("sudo /usr/sbin/service " + servicename + " start").isSuccess()

 def enableService(self, servicename,forcestart=True):
 bash("sudo update-rc.d -f " + servicename + " remove")
 bash("sudo update-rc.d -f " + servicename + " defaults")
 return self.startService(servicename,force=forcestart)

 def isKVMEnabled(self):
 return bash("kvm-ok").isSuccess()

class serviceOpsRedhat7Later(serviceOps):
 def isServiceRunning(self, servicename):
 try:
 o = bash("systemctl is-active " + servicename)
 textout = o.getStdout()
 return "inactive" not in textout and "failed" not in textout
 except:
 return False

 def stopService(self, servicename,force=False):
 if self.isServiceRunning(servicename) or force:
 return bash("systemctl stop " + servicename).isSuccess()

 return True
 def disableService(self, servicename):
 result = self.stopService(servicename)
 bash("systemctl disable " + servicename)
 return result

 def startService(self, servicename,force=False):
 if not self.isServiceRunning(servicename) or force:
 return bash("systemctl start " + servicename).isSuccess()
 return True

 def enableService(self, servicename,forcestart=False):
 bash("systemctl enable " + servicename)
 return self.startService(servicename,force=forcestart)

 def isKVMEnabled(self):
 if os.path.exists("/dev/kvm"):
 return True
 else:
 return False

class serviceOpsSUSE(serviceOpsRedhat7Later):
 pass