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#
# Copyright 2014 Red Hat, Inc.
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Refer to the README and COPYING files for full details of the license
#
## most of the code is copied from vdsm project
import logging
import subprocess
from cpopen import CPopen
import io
import select
import threading
from StringIO import StringIO
from weakref import proxy
import time
import os
import errno
import signal
from collections import defaultdict
import xml.etree.cElementTree as ET
class HostStatus:
UP = 'UP'
DOWN = 'DOWN'
UNREACHABLE = 'UNREACHABLE'
class HostStatusCode:
UP = 0
DOWN = 1
UNREACHABLE = 2
class PluginStatus:
OK = 'OK'
WARNING = 'WARNING'
CRITICAL = 'CRITICAL'
UNKNOWN = 'UNKNOWN'
class PluginStatusCode:
OK = 0
WARNING = 1
CRITICAL = 2
UNKNOWN = 3
class CommandPath(object):
def __init__(self, name, *args):
self.name = name
self.paths = args
self._cmd = None
@property
def cmd(self):
if not self._cmd:
for path in self.paths:
if os.path.exists(path):
self._cmd = path
break
else:
raise OSError(os.errno.ENOENT,
os.strerror(os.errno.ENOENT) + ': ' + self.name)
return self._cmd
def __repr__(self):
return str(self.cmd)
def __str__(self):
return str(self.cmd)
def __unicode__(self):
return unicode(self.cmd)
ioniceCmdPath = CommandPath("ionice",
"/bin/ionice",
)
killCmdPath = CommandPath("kill",
"/bin/kill",
)
niceCmdPath = CommandPath("nice",
"/bin/nice",
)
setsidCmdPath = CommandPath("setsid",
"/bin/setsid",
)
sudoCmdPath = CommandPath("sudo",
"/usr/bin/sudo",
)
hostnameCmdPath = CommandPath("hostname", "/bin/hostname", )
glusterCmdPath = CommandPath("gluster", "/usr/sbin/gluster")
trapCmdPath = CommandPath("snmptrap", "/usr/bin/snmptrap")
# Buffsize is 1K because I tested it on some use cases and 1K was fastest. If
# you find this number to be a bottleneck in any way you are welcome to change
# it
BUFFSIZE = 1024
SUDO_NON_INTERACTIVE_FLAG = "-n"
# NOTE: it would be best to try and unify NoIntrCall and NoIntrPoll.
# We could do so defining a new object that can be used as a placeholer
# for the changing timeout value in the *args/**kwargs. This would
# lead us to rebuilding the function arguments at each loop.
def NoIntrPoll(pollfun, timeout=-1):
"""
This wrapper is used to handle the interrupt exceptions that might
occur during a poll system call. The wrapped function must be defined
as poll([timeout]) where the special timeout value 0 is used to return
immediately and -1 is used to wait indefinitely.
"""
# When the timeout < 0 we shouldn't compute a new timeout after an
# interruption.
endtime = None if timeout < 0 else time.time() + timeout
while True:
try:
return pollfun(timeout)
except (IOError, select.error) as e:
if e.args[0] != errno.EINTR:
raise
if endtime is not None:
timeout = max(0, endtime - time.time())
class AsyncProc(object):
"""
AsyncProc is a funky class. It wraps a standard subprocess.Popen
Object and gives it super powers. Like the power to read from a stream
without the fear of deadlock. It does this by always sampling all
stream while waiting for data. By doing this the other process can freely
write data to all stream without the fear of it getting stuck writing
to a full pipe.
"""
class _streamWrapper(io.RawIOBase):
def __init__(self, parent, streamToWrap, fd):
io.IOBase.__init__(self)
self._stream = streamToWrap
self._parent = proxy(parent)
self._fd = fd
self._closed = False
def close(self):
if not self._closed:
self._closed = True
while not self._streamClosed:
self._parent._processStreams()
@property
def closed(self):
return self._closed
@property
def _streamClosed(self):
return (self.fileno() in self._parent._closedfds)
def fileno(self):
return self._fd
def seekable(self):
return False
def readable(self):
return True
def writable(self):
return True
def _readNonBlock(self, length):
hasNewData = (self._stream.len - self._stream.pos)
if hasNewData < length and not self._streamClosed:
self._parent._processStreams()
with self._parent._streamLock:
res = self._stream.read(length)
if self._stream.pos == self._stream.len:
self._stream.truncate(0)
if res == "" and not self._streamClosed:
return None
else:
return res
def read(self, length):
if not self._parent.blocking:
return self._readNonBlock(length)
else:
res = None
while res is None:
res = self._readNonBlock(length)
return res
def readinto(self, b):
data = self.read(len(b))
if data is None:
return None
bytesRead = len(data)
b[:bytesRead] = data
return bytesRead
def write(self, data):
if hasattr(data, "tobytes"):
data = data.tobytes()
with self._parent._streamLock:
oldPos = self._stream.pos
self._stream.pos = self._stream.len
self._stream.write(data)
self._stream.pos = oldPos
while self._stream.len > 0 and not self._streamClosed:
self._parent._processStreams()
if self._streamClosed:
self._closed = True
if self._stream.len != 0:
raise IOError(errno.EPIPE,
"Could not write all data to stream")
return len(data)
def __init__(self, popenToWrap):
self._streamLock = threading.Lock()
self._proc = popenToWrap
self._stdout = StringIO()
self._stderr = StringIO()
self._stdin = StringIO()
fdout = self._proc.stdout.fileno()
fderr = self._proc.stderr.fileno()
self._fdin = self._proc.stdin.fileno()
self._closedfds = []
self._poller = select.epoll()
self._poller.register(fdout, select.EPOLLIN | select.EPOLLPRI)
self._poller.register(fderr, select.EPOLLIN | select.EPOLLPRI)
self._poller.register(self._fdin, 0)
self._fdMap = {fdout: self._stdout,
fderr: self._stderr,
self._fdin: self._stdin}
self.stdout = io.BufferedReader(self._streamWrapper(self,
self._stdout, fdout), BUFFSIZE)
self.stderr = io.BufferedReader(self._streamWrapper(self,
self._stderr, fderr), BUFFSIZE)
self.stdin = io.BufferedWriter(self._streamWrapper(self,
self._stdin, self._fdin), BUFFSIZE)
self._returncode = None
self.blocking = False
def _processStreams(self):
if len(self._closedfds) == 3:
return
if not self._streamLock.acquire(False):
self._streamLock.acquire()
self._streamLock.release()
return
try:
if self._stdin.len > 0 and self._stdin.pos == 0:
# Polling stdin is redundant if there is nothing to write
# turn on only if data is waiting to be pushed
self._poller.modify(self._fdin, select.EPOLLOUT)
pollres = NoIntrPoll(self._poller.poll, 1)
for fd, event in pollres:
stream = self._fdMap[fd]
if event & select.EPOLLOUT and self._stdin.len > 0:
buff = self._stdin.read(BUFFSIZE)
written = os.write(fd, buff)
stream.pos -= len(buff) - written
if stream.pos == stream.len:
stream.truncate(0)
self._poller.modify(fd, 0)
elif event & (select.EPOLLIN | select.EPOLLPRI):
data = os.read(fd, BUFFSIZE)
oldpos = stream.pos
stream.pos = stream.len
stream.write(data)
stream.pos = oldpos
elif event & (select.EPOLLHUP | select.EPOLLERR):
self._poller.unregister(fd)
self._closedfds.append(fd)
# I don't close the fd because the original Popen
# will do it.
if self.stdin.closed and self._fdin not in self._closedfds:
self._poller.unregister(self._fdin)
self._closedfds.append(self._fdin)
self._proc.stdin.close()
finally:
self._streamLock.release()
@property
def pid(self):
return self._proc.pid
@property
def returncode(self):
if self._returncode is None:
self._returncode = self._proc.poll()
return self._returncode
def kill(self):
try:
self._proc.kill()
except OSError as ex:
if ex.errno != errno.EPERM:
raise
execCmd([killCmdPath.cmd, "-%d" % (signal.SIGTERM,),
str(self.pid)], sudo=True)
def wait(self, timeout=None, cond=None):
startTime = time.time()
while self.returncode is None:
if timeout is not None and (time.time() - startTime) > timeout:
return False
if cond is not None and cond():
return False
self._processStreams()
return True
def communicate(self, data=None):
if data is not None:
self.stdin.write(data)
self.stdin.flush()
self.stdin.close()
self.wait()
return "".join(self.stdout), "".join(self.stderr)
def __del__(self):
self._poller.close()
def execCmd(command, sudo=False, cwd=None, data=None, raw=False, logErr=True,
printable=None, env=None, sync=True, nice=None, ioclass=None,
ioclassdata=None, setsid=False, execCmdLogger=logging.root,
deathSignal=0, childUmask=None):
"""
Executes an external command, optionally via sudo.
IMPORTANT NOTE: the new process would receive `deathSignal` when the
controlling thread dies, which may not be what you intended: if you create
a temporary thread, spawn a sync=False sub-process, and have the thread
finish, the new subprocess would die immediately.
"""
if ioclass is not None:
cmd = command
command = [ioniceCmdPath.cmd, '-c', str(ioclass)]
if ioclassdata is not None:
command.extend(("-n", str(ioclassdata)))
command = command + cmd
if nice is not None:
command = [niceCmdPath.cmd, '-n', str(nice)] + command
if setsid:
command = [setsidCmdPath.cmd] + command
if sudo:
command = [sudoCmdPath.cmd, SUDO_NON_INTERACTIVE_FLAG] + command
if not printable:
printable = command
cmdline = repr(subprocess.list2cmdline(printable))
execCmdLogger.debug("%s (cwd %s)", cmdline, cwd)
p = CPopen(command, close_fds=True, cwd=cwd, env=env,
deathSignal=deathSignal, childUmask=childUmask)
p = AsyncProc(p)
if not sync:
if data is not None:
p.stdin.write(data)
p.stdin.flush()
return p
(out, err) = p.communicate(data)
if out is None:
# Prevent splitlines() from barfing later on
out = ""
execCmdLogger.debug("%s: <err> = %s; <rc> = %d",
{True: "SUCCESS", False: "FAILED"}[p.returncode == 0],
repr(err), p.returncode)
if not raw:
out = out.splitlines(False)
err = err.splitlines(False)
return (p.returncode, out, err)
def retry(func, expectedException=Exception, tries=None,
timeout=None, sleep=1, stopCallback=None):
"""
Retry a function. Wraps the retry logic so you don't have to
implement it each time you need it.
:param func: The callable to run.
:param expectedException: The exception you expect to receive when the
function fails.
:param tries: The number of times to try. None\0,-1 means infinite.
:param timeout: The time you want to spend waiting. This **WILL NOT** stop
the method. It will just not run it if it ended after the
timeout.
:param sleep: Time to sleep between calls in seconds.
:param stopCallback: A function that takes no parameters and causes the
method to stop retrying when it returns with a
positive value.
"""
if tries in [0, None]:
tries = -1
if timeout in [0, None]:
timeout = -1
startTime = time.time()
while True:
tries -= 1
try:
return func()
except expectedException:
if tries == 0:
raise
if (timeout > 0) and ((time.time() - startTime) > timeout):
raise
if stopCallback is not None and stopCallback():
raise
time.sleep(sleep)
def xml2dict(tree):
d = {tree.tag: {} if tree.attrib else None}
children = list(tree)
if children:
dd = defaultdict(list)
for dc in map(xml2dict, children):
for k, v in dc.iteritems():
dd[k].append(v)
d = {tree.tag: {}}
for k, v in dd.iteritems():
d[tree.tag][k] = v[0] if len(v) == 1 else v
if tree.attrib:
d[tree.tag].update((k, v) for k, v in tree.attrib.iteritems())
if tree.text:
text = tree.text.strip()
if children or tree.attrib:
if text:
d[tree.tag]['#text'] = text
else:
d[tree.tag] = text
return d
def convertSize(val, unitFrom, unitTo):
''' Convert size from one unit to another
For example, KB to MB
'''
units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
unitFromIndex = units.index(unitFrom)
unitToIndex = units.index(unitTo)
if unitFromIndex < unitToIndex:
convFactor = 1 << (unitToIndex - unitFromIndex) * 10
return float(val) / convFactor
if unitFromIndex > unitToIndex:
convFactor = 1 << (unitFromIndex - unitToIndex) * 10
return float(val) * convFactor
return val
def parseXml(xmldoc, searchStr):
root = ET.fromstring(xmldoc)
statusStr = root.findall(searchStr)
return statusStr
def getsnmpmanagers(path):
listofmanagers = []
with open(path, "r") as mangerconfig:
for line in mangerconfig.readlines():
if line.startswith("#"):
continue
config = line.split()
if len(config) == 2:
listofmanagers.\
append({'host': config[0], 'community': config[1]})
return listofmanagers
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