#
# Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
# This file is part of GlusterFS.
# This file is licensed to you under your choice of the GNU Lesser
# General Public License, version 3 or any later version (LGPLv3 or
# later), or the GNU General Public License, version 2 (GPLv2), in all
# cases as published by the Free Software Foundation.
#
import os
import sys
import pwd
import time
import fcntl
import shutil
import logging
import errno
import threading
import subprocess
import socket
from subprocess import PIPE
from threading import Lock, Thread as baseThread
from errno import EACCES, EAGAIN, EPIPE, ENOTCONN, ECONNABORTED
from errno import EINTR, ENOENT, ESTALE, EBUSY, errorcode
from signal import signal, SIGTERM
import select as oselect
from os import waitpid as owaitpid
import xml.etree.ElementTree as XET
from select import error as SelectError
try:
from cPickle import PickleError
except ImportError:
from pickle import PickleError
from conf import GLUSTERFS_LIBEXECDIR, UUID_FILE
sys.path.insert(1, GLUSTERFS_LIBEXECDIR)
EVENTS_ENABLED = True
try:
from gfevents.eventtypes import GEOREP_FAULTY as EVENT_GEOREP_FAULTY
from gfevents.eventtypes import GEOREP_ACTIVE as EVENT_GEOREP_ACTIVE
from gfevents.eventtypes import GEOREP_PASSIVE as EVENT_GEOREP_PASSIVE
from gfevents.eventtypes import GEOREP_CHECKPOINT_COMPLETED \
as EVENT_GEOREP_CHECKPOINT_COMPLETED
except ImportError:
# Events APIs not installed, dummy eventtypes with None
EVENTS_ENABLED = False
EVENT_GEOREP_FAULTY = None
EVENT_GEOREP_ACTIVE = None
EVENT_GEOREP_PASSIVE = None
EVENT_GEOREP_CHECKPOINT_COMPLETED = None
import gsyncdconfig as gconf
from rconf import rconf
from hashlib import sha256 as sha256
# auxiliary gfid based access prefix
_CL_AUX_GFID_PFX = ".gfid/"
GF_OP_RETRIES = 10
GX_GFID_CANONICAL_LEN = 37 # canonical gfid len + '\0'
CHANGELOG_AGENT_SERVER_VERSION = 1.0
CHANGELOG_AGENT_CLIENT_VERSION = 1.0
NodeID = None
rsync_version = None
unshare_mnt_propagation = None
slv_bricks = None
SPACE_ESCAPE_CHAR = "%20"
NEWLINE_ESCAPE_CHAR = "%0A"
PERCENTAGE_ESCAPE_CHAR = "%25"
final_lock = Lock()
def sup(x, *a, **kw):
"""a rubyesque "super" for python ;)
invoke caller method in parent class with given args.
"""
return getattr(super(type(x), x),
sys._getframe(1).f_code.co_name)(*a, **kw)
def escape(s):
"""the chosen flavor of string escaping, used all over
to turn whatever data to creatable representation"""
return s.replace("/", "-").strip("-")
def escape_space_newline(s):
return s.replace("%", PERCENTAGE_ESCAPE_CHAR)\
.replace(" ", SPACE_ESCAPE_CHAR)\
.replace("\n", NEWLINE_ESCAPE_CHAR)
def unescape_space_newline(s):
return s.replace(SPACE_ESCAPE_CHAR, " ")\
.replace(NEWLINE_ESCAPE_CHAR, "\n")\
.replace(PERCENTAGE_ESCAPE_CHAR, "%")
def norm(s):
if s:
return s.replace('-', '_')
def update_file(path, updater, merger=lambda f: True):
"""update a file in a transaction-like manner"""
fr = fw = None
try:
fd = os.open(path, os.O_CREAT | os.O_RDWR)
try:
fr = os.fdopen(fd, 'r+b')
except:
os.close(fd)
raise
fcntl.lockf(fr, fcntl.LOCK_EX)
if not merger(fr):
return
tmpp = path + '.tmp.' + str(os.getpid())
fd = os.open(tmpp, os.O_CREAT | os.O_EXCL | os.O_WRONLY)
try:
fw = os.fdopen(fd, 'wb', 0)
except:
os.close(fd)
raise
updater(fw)
os.fsync(fd)
os.rename(tmpp, path)
finally:
for fx in (fr, fw):
if fx:
fx.close()
def create_manifest(fname, content):
"""
Create manifest file for SSH Control Path
"""
fd = None
try:
fd = os.open(fname, os.O_CREAT | os.O_RDWR)
try:
os.write(fd, content)
except:
os.close(fd)
raise
finally:
if fd is not None:
os.close(fd)
def setup_ssh_ctl(ctld, remote_addr, resource_url):
"""
Setup GConf ssh control path parameters
"""
rconf.ssh_ctl_dir = ctld
content = "SLAVE_HOST=%s\nSLAVE_RESOURCE_URL=%s" % (remote_addr,
resource_url)
encoded_content = content.encode()
content_sha256 = sha256hex(encoded_content)
"""
The length of ctl_path for ssh connection should not be > 108.
ssh fails with ctl_path too long if it is so. But when rsync
is piped to ssh, it is not taking > 90. Hence using first 32
bytes of hash. Hash collision doesn't matter as only one sock
file is created per directory.
"""
content_sha256 = content_sha256[:32]
fname = os.path.join(rconf.ssh_ctl_dir,
"%s.mft" % content_sha256)
create_manifest(fname, encoded_content)
ssh_ctl_path = os.path.join(rconf.ssh_ctl_dir,
"%s.sock" % content_sha256)
rconf.ssh_ctl_args = ["-oControlMaster=auto", "-S", ssh_ctl_path]
def grabfile(fname, content=None):
"""open @fname + contest for its fcntl lock
@content: if given, set the file content to it
"""
# damn those messy open() mode codes
fd = os.open(fname, os.O_CREAT | os.O_RDWR)
f = os.fdopen(fd, 'r+')
try:
fcntl.lockf(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
except:
ex = sys.exc_info()[1]
f.close()
if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
# cannot grab, it's taken
return
raise
if content:
try:
f.truncate()
f.write(content)
f.flush()
except:
f.close()
raise
rconf.permanent_handles.append(f)
return f
def grabpidfile(fname=None, setpid=True):
""".grabfile customization for pid files"""
if not fname:
fname = gconf.get("pid-file")
content = None
if setpid:
content = str(os.getpid()) + '\n'
return grabfile(fname, content=content)
def finalize(*args, **kwargs):
"""all those messy final steps we go trough upon termination
Do away with pidfile, ssh control dir and logging.
"""
final_lock.acquire()
if gconf.get('pid_file'):
rm_pidf = rconf.pid_file_owned
if rconf.cpid:
# exit path from parent branch of daemonization
rm_pidf = False
while True:
f = grabpidfile(setpid=False)
if not f:
# child has already taken over pidfile
break
if os.waitpid(rconf.cpid, os.WNOHANG)[0] == rconf.cpid:
# child has terminated
rm_pidf = True
break
time.sleep(0.1)
if rm_pidf:
try:
os.unlink(rconf.pid_file)
except:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
pass
else:
raise
if rconf.ssh_ctl_dir and not rconf.cpid:
def handle_rm_error(func, path, exc_info):
if exc_info[1].errno == ENOENT:
return
raise exc_info[1]
shutil.rmtree(rconf.ssh_ctl_dir, onerror=handle_rm_error)
""" Unmount if not done """
if rconf.mount_point:
if rconf.mountbroker:
umount_cmd = rconf.mbr_umount_cmd + [rconf.mount_point, 'lazy']
else:
umount_cmd = ['umount', '-l', rconf.mount_point]
p0 = subprocess.Popen(umount_cmd, stderr=subprocess.PIPE,
universal_newlines=True)
_, errdata = p0.communicate()
if p0.returncode == 0:
try:
os.rmdir(rconf.mount_point)
except OSError:
pass
else:
pass
if rconf.log_exit:
logging.info("exiting.")
sys.stdout.flush()
sys.stderr.flush()
os._exit(kwargs.get('exval', 0))
def log_raise_exception(excont):
"""top-level exception handler
Try to some fancy things to cover up we face with an error.
Translate some weird sounding but well understood exceptions
into human-friendly lingo
"""
is_filelog = False
for h in logging.getLogger().handlers:
fno = getattr(getattr(h, 'stream', None), 'fileno', None)
if fno and not os.isatty(fno()):
is_filelog = True
exc = sys.exc_info()[1]
if isinstance(exc, SystemExit):
excont.exval = exc.code or 0
raise
else:
logtag = None
if isinstance(exc, GsyncdError):
if is_filelog:
logging.error(exc.args[0])
sys.stderr.write('failure: ' + exc.args[0] + '\n')
elif isinstance(exc, PickleError) or isinstance(exc, EOFError) or \
((isinstance(exc, OSError) or isinstance(exc, IOError)) and
exc.errno == EPIPE):
logging.error('connection to peer is broken')
if hasattr(rconf, 'transport'):
rconf.transport.wait()
if rconf.transport.returncode == 127:
logging.error("getting \"No such file or directory\""
"errors is most likely due to "
"MISCONFIGURATION, please remove all "
"the public keys added by geo-replication "
"from authorized_keys file in slave nodes "
"and run Geo-replication create "
"command again.")
logging.error("If `gsec_create container` was used, then "
"run `gluster volume geo-replication "
"<MASTERVOL> [<SLAVEUSER>@]<SLAVEHOST>::"
"<SLAVEVOL> config remote-gsyncd "
"<GSYNCD_PATH> (Example GSYNCD_PATH: "
"`/usr/libexec/glusterfs/gsyncd`)")
rconf.transport.terminate_geterr()
elif isinstance(exc, OSError) and exc.errno in (ENOTCONN,
ECONNABORTED):
logging.error(lf('Gluster Mount process exited',
error=errorcode[exc.errno]))
else:
logtag = "FAIL"
if not logtag and logging.getLogger().isEnabledFor(logging.DEBUG):
logtag = "FULL EXCEPTION TRACE"
if logtag:
logging.exception(logtag + ": ")
sys.stderr.write("failed with %s.\n" % type(exc).__name__)
excont.exval = 1
sys.exit(excont.exval)
class FreeObject(object):
"""wildcard class for which any attribute can be set"""
def __init__(self, **kw):
for k, v in kw.items():
setattr(self, k, v)
class Thread(baseThread):
"""thread class flavor for gsyncd
- always a daemon thread
- force exit for whole program if thread
function coughs up an exception
"""
def __init__(self, *args, **kwargs):
tf = kwargs.get('target')
if tf:
def twrap(*aargs):
excont = FreeObject(exval=0)
try:
tf(*aargs)
except:
try:
log_raise_exception(excont)
finally:
finalize(exval=excont.exval)
kwargs['target'] = twrap
baseThread.__init__(self, *args, **kwargs)
self.setDaemon(True)
class GsyncdError(Exception):
pass
class _MetaXattr(object):
"""singleton class, a lazy wrapper around the
libcxattr module
libcxattr (a heavy import due to ctypes) is
loaded only when when the single
instance is tried to be used.
This reduces runtime for those invocations
which do not need filesystem manipulation
(eg. for config, url parsing)
"""
def __getattr__(self, meth):
from libcxattr import Xattr as LXattr
xmeth = [m for m in dir(LXattr) if m[0] != '_']
if meth not in xmeth:
return
for m in xmeth:
setattr(self, m, getattr(LXattr, m))
return getattr(self, meth)
Xattr = _MetaXattr()
def getusername(uid=None):
if uid is None:
uid = os.geteuid()
return pwd.getpwuid(uid).pw_name
def privileged():
return os.geteuid() == 0
def boolify(s):
"""
Generic string to boolean converter
return
- Quick return if string 's' is of type bool
- True if it's in true_list
- False if it's in false_list
- Warn if it's not present in either and return False
"""
true_list = ['true', 'yes', '1', 'on']
false_list = ['false', 'no', '0', 'off']
if isinstance(s, bool):
return s
rv = False
lstr = s.lower()
if lstr in true_list:
rv = True
elif lstr not in false_list:
logging.warn(lf("Unknown string in \"string to boolean\" conversion, "
"defaulting to False",
str=s))
return rv
def eintr_wrap(func, exc, *args):
"""
wrapper around syscalls resilient to interrupt caused
by signals
"""
while True:
try:
return func(*args)
except exc:
ex = sys.exc_info()[1]
if not ex.args[0] == EINTR:
raise
def select(*args):
return eintr_wrap(oselect.select, oselect.error, *args)
def waitpid(*args):
return eintr_wrap(owaitpid, OSError, *args)
def term_handler_default_hook(signum, frame):
finalize(signum, frame, exval=1)
def set_term_handler(hook=term_handler_default_hook):
signal(SIGTERM, hook)
def get_node_uuid():
global NodeID
if NodeID is not None:
return NodeID
NodeID = ""
with open(UUID_FILE) as f:
for line in f:
if line.startswith("UUID="):
NodeID = line.strip().split("=")[-1]
break
if NodeID == "":
raise GsyncdError("Failed to get Host UUID from %s" % UUID_FILE)
return NodeID
def is_host_local(host_id):
return host_id == get_node_uuid()
def funcode(f):
fc = getattr(f, 'func_code', None)
if not fc:
# python 3
fc = f.__code__
return fc
def memoize(f):
fc = funcode(f)
fn = fc.co_name
def ff(self, *a, **kw):
rv = getattr(self, '_' + fn, None)
if rv is None:
rv = f(self, *a, **kw)
setattr(self, '_' + fn, rv)
return rv
return ff
def umask():
return os.umask(0)
def entry2pb(e):
return e.rsplit('/', 1)
def gauxpfx():
return _CL_AUX_GFID_PFX
def sha256hex(s):
return sha256(s).hexdigest()
def selfkill(sig=SIGTERM):
os.kill(os.getpid(), sig)
def errno_wrap(call, arg=[], errnos=[], retry_errnos=[]):
""" wrapper around calls resilient to errnos.
"""
nr_tries = 0
while True:
try:
return call(*arg)
except OSError:
ex = sys.exc_info()[1]
if ex.errno in errnos:
return ex.errno
if ex.errno not in retry_errnos:
raise
nr_tries += 1
if nr_tries == GF_OP_RETRIES:
# probably a screwed state, cannot do much...
logging.warn(lf('reached maximum retries',
args=repr(arg),
error=ex))
raise
time.sleep(0.250) # retry the call
def lstat(e):
return errno_wrap(os.lstat, [e], [ENOENT], [ESTALE, EBUSY])
def get_gfid_from_mnt(gfidpath):
return errno_wrap(Xattr.lgetxattr,
[gfidpath, 'glusterfs.gfid.string',
GX_GFID_CANONICAL_LEN], [ENOENT], [ESTALE])
def matching_disk_gfid(gfid, entry):
disk_gfid = get_gfid_from_mnt(entry)
if isinstance(disk_gfid, int):
return False
if not gfid == disk_gfid:
return False
return True
class NoStimeAvailable(Exception):
pass
class PartialHistoryAvailable(Exception):
pass
class ChangelogHistoryNotAvailable(Exception):
pass
class ChangelogException(OSError):
pass
def gf_event(event_type, **kwargs):
if EVENTS_ENABLED:
from gfevents.gf_event import gf_event as gfevent
gfevent(event_type, **kwargs)
class GlusterLogLevel(object):
NONE = 0
EMERG = 1
ALERT = 2
CRITICAL = 3
ERROR = 4
WARNING = 5
NOTICE = 6
INFO = 7
DEBUG = 8
TRACE = 9
def get_changelog_log_level(lvl):
return getattr(GlusterLogLevel, lvl, GlusterLogLevel.INFO)
def get_master_and_slave_data_from_args(args):
master_name = None
slave_data = None
for arg in args:
if arg.startswith(":"):
master_name = arg.replace(":", "")
if "::" in arg:
slave_data = arg.replace("ssh://", "")
return (master_name, slave_data)
def unshare_propagation_supported():
global unshare_mnt_propagation
if unshare_mnt_propagation is not None:
return unshare_mnt_propagation
unshare_mnt_propagation = False
p = subprocess.Popen(["unshare", "--help"],
stderr=subprocess.PIPE,
stdout=subprocess.PIPE,
universal_newlines=True)
out, err = p.communicate()
if p.returncode == 0:
if "propagation" in out:
unshare_mnt_propagation = True
return unshare_mnt_propagation
def get_rsync_version(rsync_cmd):
global rsync_version
if rsync_version is not None:
return rsync_version
rsync_version = "0"
p = subprocess.Popen([rsync_cmd, "--version"],
stderr=subprocess.PIPE,
stdout=subprocess.PIPE,
universal_newlines=True)
out, err = p.communicate()
if p.returncode == 0:
rsync_version = out.split(" ", 4)[3]
return rsync_version
def get_slv_dir_path(slv_host, slv_volume, gfid):
global slv_bricks
dir_path = ENOENT
if not slv_bricks:
slv_info = Volinfo(slv_volume, slv_host)
slv_bricks = slv_info.bricks
# Result of readlink would be of format as below.
# readlink = "../../pgfid[0:2]/pgfid[2:4]/pgfid/basename"
for brick in slv_bricks:
dir_path = errno_wrap(os.path.join,
[brick['dir'],
".glusterfs", gfid[0:2],
gfid[2:4],
gfid], [ENOENT], [ESTALE])
if dir_path != ENOENT:
realpath = errno_wrap(os.readlink, [dir_path],
[ENOENT], [ESTALE])
if not isinstance(realpath, int):
realpath_parts = realpath.split('/')
pargfid = realpath_parts[-2]
basename = realpath_parts[-1]
pfx = gauxpfx()
dir_entry = os.path.join(pfx, pargfid, basename)
return dir_entry
return None
def lf(event, **kwargs):
"""
Log Format helper function, log messages can be
easily modified to structured log format.
lf("Config Change", sync_jobs=4, brick=/bricks/b1) will be
converted as "Config Change<TAB>brick=/bricks/b1<TAB>sync_jobs=4"
"""
msg = event
for k, v in kwargs.items():
msg += "\t{0}={1}".format(k, v)
return msg
class Popen(subprocess.Popen):
"""customized subclass of subprocess.Popen with a ring
buffer for children error output"""
@classmethod
def init_errhandler(cls):
"""start the thread which handles children's error output"""
cls.errstore = {}
def tailer():
while True:
errstore = cls.errstore.copy()
try:
poe, _, _ = select(
[po.stderr for po in errstore], [], [], 1)
except (ValueError, SelectError):
# stderr is already closed wait for some time before
# checking next error
time.sleep(0.5)
continue
for po in errstore:
if po.stderr not in poe:
continue
po.lock.acquire()
try:
if po.on_death_row:
continue
la = errstore[po]
try:
fd = po.stderr.fileno()
except ValueError: # file is already closed
time.sleep(0.5)
continue
try:
l = os.read(fd, 1024)
except OSError:
time.sleep(0.5)
continue
if not l:
continue
tots = len(l)
for lx in la:
tots += len(lx)
while tots > 1 << 20 and la:
tots -= len(la.pop(0))
la.append(l)
finally:
po.lock.release()
t = Thread(target=tailer)
t.start()
cls.errhandler = t
@classmethod
def fork(cls):
"""fork wrapper that restarts errhandler thread in child"""
pid = os.fork()
if not pid:
cls.init_errhandler()
return pid
def __init__(self, args, *a, **kw):
"""customizations for subprocess.Popen instantiation
- 'close_fds' is taken to be the default
- if child's stderr is chosen to be managed,
register it with the error handler thread
"""
self.args = args
if 'close_fds' not in kw:
kw['close_fds'] = True
self.lock = threading.Lock()
self.on_death_row = False
self.elines = []
try:
sup(self, args, *a, **kw)
except:
ex = sys.exc_info()[1]
if not isinstance(ex, OSError):
raise
raise GsyncdError("""execution of "%s" failed with %s (%s)""" %
(args[0], errno.errorcode[ex.errno],
os.strerror(ex.errno)))
if kw.get('stderr') == subprocess.PIPE:
assert(getattr(self, 'errhandler', None))
self.errstore[self] = []
def errlog(self):
"""make a log about child's failure event"""
logging.error(lf("command returned error",
cmd=" ".join(self.args),
error=self.returncode))
lp = ''
def logerr(l):
logging.error(self.args[0] + "> " + l)
for l in self.elines:
ls = l.split('\n')
ls[0] = lp + ls[0]
lp = ls.pop()
for ll in ls:
logerr(ll)
if lp:
logerr(lp)
def errfail(self):
"""fail nicely if child did not terminate with success"""
self.errlog()
finalize(exval=1)
def terminate_geterr(self, fail_on_err=True):
"""kill child, finalize stderr harvesting (unregister
from errhandler, set up .elines), fail on error if
asked for
"""
self.lock.acquire()
try:
self.on_death_row = True
finally:
self.lock.release()
elines = self.errstore.pop(self)
if self.poll() is None:
self.terminate()
if self.poll() is None:
time.sleep(0.1)
self.kill()
self.wait()
while True:
if not select([self.stderr], [], [], 0.1)[0]:
break
b = os.read(self.stderr.fileno(), 1024)
if b:
elines.append(b.decode())
else:
break
self.stderr.close()
self.elines = elines
if fail_on_err and self.returncode != 0:
self.errfail()
class Volinfo(object):
def __init__(self, vol, host='localhost', prelude=[]):
po = Popen(prelude + ['gluster', '--xml', '--remote-host=' + host,
'volume', 'info', vol],
stdout=PIPE, stderr=PIPE, universal_newlines=True)
vix = po.stdout.read()
po.wait()
po.terminate_geterr()
vi = XET.fromstring(vix)
if vi.find('opRet').text != '0':
if prelude:
via = '(via %s) ' % prelude.join(' ')
else:
via = ' '
raise GsyncdError('getting volume info of %s%s '
'failed with errorcode %s' %
(vol, via, vi.find('opErrno').text))
self.tree = vi
self.volume = vol
self.host = host
def get(self, elem):
return self.tree.findall('.//' + elem)
def is_tier(self):
return (self.get('typeStr')[0].text == 'Tier')
def is_hot(self, brickpath):
logging.debug('brickpath: ' + repr(brickpath))
return brickpath in self.hot_bricks
@property
@memoize
def bricks(self):
def bparse(b):
host, dirp = b.find("name").text.split(':', 2)
return {'host': host, 'dir': dirp, 'uuid': b.find("hostUuid").text}
return [bparse(b) for b in self.get('brick')]
@property
@memoize
def uuid(self):
ids = self.get('id')
if len(ids) != 1:
raise GsyncdError("volume info of %s obtained from %s: "
"ambiguous uuid" % (self.volume, self.host))
return ids[0].text
def replica_count(self, tier, hot):
if (tier and hot):
return int(self.get('hotBricks/hotreplicaCount')[0].text)
elif (tier and not hot):
return int(self.get('coldBricks/coldreplicaCount')[0].text)
else:
return int(self.get('replicaCount')[0].text)
def disperse_count(self, tier, hot):
if (tier and hot):
# Tiering doesn't support disperse volume as hot brick,
# hence no xml output, so returning 0. In case, if it's
# supported later, we should change here.
return 0
elif (tier and not hot):
return int(self.get('coldBricks/colddisperseCount')[0].text)
else:
return int(self.get('disperseCount')[0].text)
@property
@memoize
def hot_bricks(self):
return [b.text for b in self.get('hotBricks/brick')]
def get_hot_bricks_count(self, tier):
if (tier):
return int(self.get('hotBricks/hotbrickCount')[0].text)
else:
return 0
class VolinfoFromGconf(object):
# Glusterd will generate following config items before Geo-rep start
# So that Geo-rep need not run gluster commands from inside
# Volinfo object API/interface kept as is so that caller need not
# change anything except calling this instead of Volinfo()
#
# master-bricks=
# master-bricks=NODEID:HOSTNAME:PATH,..
# slave-bricks=NODEID:HOSTNAME,..
# master-volume-id=
# slave-volume-id=
# master-replica-count=
# master-disperse_count=
def __init__(self, vol, host='localhost', master=True):
self.volume = vol
self.host = host
self.master = master
def is_tier(self):
return False
def is_hot(self, brickpath):
return False
@property
@memoize
def bricks(self):
pfx = "master-" if self.master else "slave-"
bricks_data = gconf.get(pfx + "bricks")
if bricks_data is None:
return []
bricks_data = bricks_data.split(",")
bricks_data = [b.strip() for b in bricks_data]
out = []
for b in bricks_data:
parts = b.split(":")
bpath = parts[2] if len(parts) == 3 else ""
out.append({"host": parts[1], "dir": bpath, "uuid": parts[0]})
return out
@property
@memoize
def uuid(self):
if self.master:
return gconf.get("master-volume-id")
else:
return gconf.get("slave-volume-id")
def replica_count(self, tier, hot):
return gconf.get("master-replica-count")
def disperse_count(self, tier, hot):
return gconf.get("master-disperse-count")
@property
@memoize
def hot_bricks(self):
return []
def get_hot_bricks_count(self, tier):
return 0
def can_ssh(host, port=22):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.connect((host, port))
flag = True
except socket.error:
flag = False
s.close()
return flag
def get_up_nodes(hosts, port):
# List of hosts with Hostname/IP and UUID
up_nodes = []
for h in hosts:
if can_ssh(h[0], port):
up_nodes.append(h)
return up_nodes