/usr/lib/x86_64-linux-gnu/glusterfs/python/syncdaemon/resource.py is in glusterfs-common 3.5.2-2+deb8u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import os
import sys
import stat
import time
import fcntl
import errno
import types
import struct
import socket
import logging
import tempfile
import threading
import subprocess
from errno import EEXIST, ENOENT, ENODATA, ENOTDIR, ELOOP, EISDIR, ENOTEMPTY, ESTALE, EINVAL
from select import error as SelectError
from gconf import gconf
import repce
from repce import RepceServer, RepceClient
from master import gmaster_builder
import syncdutils
from syncdutils import GsyncdError, select, privileged, boolify, funcode
from syncdutils import umask, entry2pb, gauxpfx, errno_wrap, lstat
UrlRX = re.compile('\A(\w+)://([^ *?[]*)\Z')
HostRX = re.compile('[a-z\d](?:[a-z\d.-]*[a-z\d])?', re.I)
UserRX = re.compile("[\w!\#$%&'*+-\/=?^_`{|}~]+")
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 desugar(ustr):
"""transform sugared url strings to standard <scheme>://<urlbody> form
parsing logic enforces the constraint that sugared forms should contatin
a ':' or a '/', which ensures that sugared urls do not conflict with
gluster volume names.
"""
m = re.match('([^:]*):(.*)', ustr)
if m:
if not m.groups()[0]:
return "gluster://localhost" + ustr
elif '@' in m.groups()[0] or re.search('[:/]', m.groups()[1]):
return "ssh://" + ustr
else:
return "gluster://" + ustr
else:
if ustr[0] != '/':
raise GsyncdError("cannot resolve sugared url '%s'" % ustr)
ap = os.path.normpath(ustr)
if ap.startswith('//'):
ap = ap[1:]
return "file://" + ap
def gethostbyname(hnam):
"""gethostbyname wrapper"""
try:
return socket.gethostbyname(hnam)
except socket.gaierror:
ex = sys.exc_info()[1]
raise GsyncdError("failed to resolve %s: %s" % \
(hnam, ex.strerror))
def parse_url(ustr):
"""instantiate an url object by scheme-to-class dispatch
The url classes taken into consideration are the ones in
this module whose names are full-caps.
"""
m = UrlRX.match(ustr)
if not m:
ustr = desugar(ustr)
m = UrlRX.match(ustr)
if not m:
raise GsyncdError("malformed url")
sch, path = m.groups()
this = sys.modules[__name__]
if not hasattr(this, sch.upper()):
raise GsyncdError("unknown url scheme " + sch)
return getattr(this, sch.upper())(path)
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 not meth in xmeth:
return
for m in xmeth:
setattr(self, m, getattr(LXattr, m))
return getattr(self, meth)
class _MetaChangelog(object):
def __getattr__(self, meth):
from libgfchangelog import Changes as LChanges
xmeth = [ m for m in dir(LChanges) if m[0] != '_' ]
if not meth in xmeth:
return
for m in xmeth:
setattr(self, m, getattr(LChanges, m))
return getattr(self, meth)
Xattr = _MetaXattr()
Changes = _MetaChangelog()
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):
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
continue
l = os.read(fd, 1024)
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 = syncdutils.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
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"""
filling = ""
if self.elines:
filling = ", saying:"
logging.error("""command "%s" returned with %s%s""" % \
(" ".join(self.args), repr(self.returncode), filling))
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()
syncdutils.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() == None:
self.terminate()
if self.poll() == 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)
else:
break
self.stderr.close()
self.elines = elines
if fail_on_err and self.returncode != 0:
self.errfail()
class Server(object):
"""singleton implemening those filesystem access primitives
which are needed for geo-replication functionality
(Singleton in the sense it's a class which has only static
and classmethods and is used directly, without instantiation.)
"""
GX_NSPACE_PFX = (privileged() and "trusted" or "system")
GX_NSPACE = GX_NSPACE_PFX + ".glusterfs"
NTV_FMTSTR = "!" + "B"*19 + "II"
FRGN_XTRA_FMT = "I"
FRGN_FMTSTR = NTV_FMTSTR + FRGN_XTRA_FMT
GX_GFID_CANONICAL_LEN = 37 # canonical gfid len + '\0'
GFID_XATTR = 'trusted.gfid' # for backend gfid fetch, do not use GX_NSPACE_PFX
GFID_FMTSTR = "!" + "B"*16
local_path = ''
@classmethod
def _fmt_mknod(cls, l):
return "!II%dsI%dsIII" % (cls.GX_GFID_CANONICAL_LEN, l+1)
@classmethod
def _fmt_mkdir(cls, l):
return "!II%dsI%dsII" % (cls.GX_GFID_CANONICAL_LEN, l+1)
@classmethod
def _fmt_symlink(cls, l1, l2):
return "!II%dsI%ds%ds" % (cls.GX_GFID_CANONICAL_LEN, l1+1, l2+1)
def _pathguard(f):
"""decorator method that checks
the path argument of the decorated
functions to make sure it does not
point out of the managed tree
"""
fc = funcode(f)
pi = list(fc.co_varnames).index('path')
def ff(*a):
path = a[pi]
ps = path.split('/')
if path[0] == '/' or '..' in ps:
raise ValueError('unsafe path')
a = list(a)
a[pi] = os.path.join(a[0].local_path, path)
return f(*a)
return ff
@classmethod
@_pathguard
def entries(cls, path):
"""directory entries in an array"""
# prevent symlinks being followed
if not stat.S_ISDIR(os.lstat(path).st_mode):
raise OSError(ENOTDIR, os.strerror(ENOTDIR))
return os.listdir(path)
@classmethod
@_pathguard
def lstat(cls, path):
try:
return os.lstat(path)
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return ex.errno
else:
raise
@classmethod
@_pathguard
def linkto_check(cls, path):
try:
return not (Xattr.lgetxattr_buf(path, 'trusted.glusterfs.dht.linkto') == '')
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA):
return False
else:
raise
@classmethod
@_pathguard
def gfid(cls, path):
try:
buf = Xattr.lgetxattr(path, cls.GFID_XATTR, 16)
m = re.match('(.{8})(.{4})(.{4})(.{4})(.{12})', "".join(['%02x' % x for x in struct.unpack(cls.GFID_FMTSTR, buf)]))
return '-'.join(m.groups())
except (IOError, OSError):
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return ex.errno
else:
raise
@classmethod
def gfid_mnt(cls, gfidpath):
return errno_wrap(Xattr.lgetxattr, [gfidpath, 'glusterfs.gfid.string', cls.GX_GFID_CANONICAL_LEN], [ENOENT])
@classmethod
@_pathguard
def purge(cls, path, entries=None):
"""force-delete subtrees
If @entries is not specified, delete
the whole subtree under @path (including
@path).
Otherwise, @entries should be a
a sequence of children of @path, and
the effect is identical with a joint
@entries-less purge on them, ie.
for e in entries:
cls.purge(os.path.join(path, e))
"""
me_also = entries == None
if not entries:
try:
# if it's a symlink, prevent
# following it
try:
os.unlink(path)
return
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EISDIR:
entries = os.listdir(path)
else:
raise
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOTDIR, ENOENT, ELOOP):
try:
os.unlink(path)
return
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
return
raise
else:
raise
for e in entries:
cls.purge(os.path.join(path, e))
if me_also:
os.rmdir(path)
@classmethod
@_pathguard
def _create(cls, path, ctor):
"""path creation backend routine"""
try:
ctor(path)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EEXIST:
cls.purge(path)
return ctor(path)
raise
@classmethod
@_pathguard
def mkdir(cls, path):
cls._create(path, os.mkdir)
@classmethod
@_pathguard
def symlink(cls, lnk, path):
cls._create(path, lambda p: os.symlink(lnk, p))
@classmethod
@_pathguard
def xtime(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
return struct.unpack('!II', Xattr.lgetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), 8))
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
@_pathguard
def stime_mnt(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
return struct.unpack('!II', Xattr.lgetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'stime']), 8))
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
@_pathguard
def stime(cls, path, uuid):
"""query xtime extended attribute
Return xtime of @path for @uuid as a pair of integers.
"Normal" errors due to non-existent @path or extended attribute
are tolerated and errno is returned in such a case.
"""
try:
return struct.unpack('!II', Xattr.lgetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'stime']), 8))
except OSError:
ex = sys.exc_info()[1]
if ex.errno in (ENOENT, ENODATA, ENOTDIR):
return ex.errno
else:
raise
@classmethod
def node_uuid(cls, path='.'):
try:
uuid_l = Xattr.lgetxattr_buf(path, '.'.join([cls.GX_NSPACE, 'node-uuid']))
return uuid_l[:-1].split(' ')
except OSError:
raise
@classmethod
@_pathguard
def set_stime(cls, path, uuid, mark):
"""set @mark as stime for @uuid on @path"""
Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'stime']), struct.pack('!II', *mark))
@classmethod
@_pathguard
def set_xtime(cls, path, uuid, mark):
"""set @mark as xtime for @uuid on @path"""
Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), struct.pack('!II', *mark))
@classmethod
@_pathguard
def set_xtime_remote(cls, path, uuid, mark):
"""
set @mark as xtime for @uuid on @path
the difference b/w this and set_xtime() being
set_xtime() being overloaded to set the xtime
on the brick (this method sets xtime on the
remote slave)
"""
Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), struct.pack('!II', *mark))
@classmethod
def entry_ops(cls, entries):
pfx = gauxpfx()
logging.debug('entries: %s' % repr(entries))
# regular file
def entry_pack_reg(gf, bn, mo, uid, gid):
blen = len(bn)
return struct.pack(cls._fmt_mknod(blen),
uid, gid, gf, mo, bn,
stat.S_IMODE(mo), 0, umask())
def entry_pack_reg_stat(gf, bn, st):
blen = len(bn)
mo = st['mode']
return struct.pack(cls._fmt_mknod(blen),
st['uid'], st['gid'],
gf, mo, bn,
stat.S_IMODE(mo), 0, umask())
# mkdir
def entry_pack_mkdir(gf, bn, mo, uid, gid):
blen = len(bn)
return struct.pack(cls._fmt_mkdir(blen),
uid, gid, gf, mo, bn,
stat.S_IMODE(mo), umask())
#symlink
def entry_pack_symlink(gf, bn, lnk, st):
blen = len(bn)
llen = len(lnk)
return struct.pack(cls._fmt_symlink(blen, llen),
st['uid'], st['gid'],
gf, st['mode'], bn, lnk)
def entry_purge(entry, gfid):
# This is an extremely racy code and needs to be fixed ASAP.
# The GFID check here is to be sure that the pargfid/bname
# to be purged is the GFID gotten from the changelog.
# (a stat(changelog_gfid) would also be valid here)
# The race here is between the GFID check and the purge.
disk_gfid = cls.gfid_mnt(entry)
if isinstance(disk_gfid, int):
return
if not gfid == disk_gfid:
return
er = errno_wrap(os.unlink, [entry], [ENOENT, EISDIR])
if isinstance(er, int):
if er == EISDIR:
er = errno_wrap(os.rmdir, [entry], [ENOENT, ENOTEMPTY])
if er == ENOTEMPTY:
return er
for e in entries:
blob = None
op = e['op']
gfid = e['gfid']
entry = e['entry']
(pg, bname) = entry2pb(entry)
if op in ['RMDIR', 'UNLINK']:
while True:
er = entry_purge(entry, gfid)
if isinstance(er, int):
time.sleep(1)
else:
break
elif op in ['CREATE', 'MKNOD']:
blob = entry_pack_reg(gfid, bname, e['mode'], e['uid'], e['uid'])
elif op == 'MKDIR':
blob = entry_pack_mkdir(gfid, bname, e['mode'], e['uid'], e['uid'])
elif op == 'LINK':
slink = os.path.join(pfx, gfid)
st = lstat(slink)
if isinstance(st, int):
(pg, bname) = entry2pb(entry)
blob = entry_pack_reg_stat(gfid, bname, e['stat'])
else:
errno_wrap(os.link, [slink, entry], [ENOENT, EEXIST])
elif op == 'SYMLINK':
blob = entry_pack_symlink(gfid, bname, e['link'], e['stat'])
elif op == 'RENAME':
en = e['entry1']
st = lstat(entry)
if isinstance(st, int):
(pg, bname) = entry2pb(en)
blob = entry_pack_reg_stat(gfid, bname, e['stat'])
else:
errno_wrap(os.rename, [entry, en], [ENOENT, EEXIST])
if blob:
errno_wrap(Xattr.lsetxattr_l, [pg, 'glusterfs.gfid.newfile', blob], [EEXIST], [ENOENT, ESTALE, EINVAL])
@classmethod
def meta_ops(cls, meta_entries):
logging.debug('Meta-entries: %s' % repr(meta_entries))
for e in meta_entries:
mode = e['stat']['mode']
uid = e['stat']['uid']
gid = e['stat']['gid']
go = e['go']
errno_wrap(os.chmod, [go, mode], [ENOENT], [ESTALE, EINVAL])
errno_wrap(os.chown, [go, uid, gid], [ENOENT], [ESTALE, EINVAL])
@classmethod
def changelog_register(cls, cl_brick, cl_dir, cl_log, cl_level, retries = 0):
Changes.cl_register(cl_brick, cl_dir, cl_log, cl_level, retries)
@classmethod
def changelog_scan(cls):
Changes.cl_scan()
@classmethod
def changelog_getchanges(cls):
return Changes.cl_getchanges()
@classmethod
def changelog_done(cls, clfile):
Changes.cl_done(clfile)
@classmethod
@_pathguard
def setattr(cls, path, adct):
"""set file attributes
@adct is a dict, where 'own', 'mode' and 'times'
keys are looked for and values used to perform
chown, chmod or utimes on @path.
"""
own = adct.get('own')
if own:
os.lchown(path, *own)
mode = adct.get('mode')
if mode:
os.chmod(path, stat.S_IMODE(mode))
times = adct.get('times')
if times:
os.utime(path, times)
@staticmethod
def pid():
return os.getpid()
last_keep_alive = 0
@classmethod
def keep_alive(cls, dct):
"""process keepalive messages.
Return keep-alive counter (number of received keep-alive
messages).
Now the "keep-alive" message can also have a payload which is
used to set a foreign volume-mark on the underlying file system.
"""
if dct:
key = '.'.join([cls.GX_NSPACE, 'volume-mark', dct['uuid']])
val = struct.pack(cls.FRGN_FMTSTR,
*(dct['version'] +
tuple(int(x,16) for x in re.findall('(?:[\da-f]){2}', dct['uuid'])) +
(dct['retval'],) + dct['volume_mark'][0:2] + (dct['timeout'],)))
Xattr.lsetxattr('.', key, val)
cls.last_keep_alive += 1
return cls.last_keep_alive
@staticmethod
def version():
"""version used in handshake"""
return 1.0
class SlaveLocal(object):
"""mix-in class to implement some factes of a slave server
("mix-in" is sort of like "abstract class", ie. it's not
instantiated just included in the ancesty DAG. I use "mix-in"
to indicate that it's not used as an abstract base class,
rather just taken in to implement additional functionality
on the basis of the assumed availability of certain interfaces.)
"""
def can_connect_to(self, remote):
"""determine our position in the connectibility matrix"""
return not remote
def service_loop(self):
"""start a RePCe server serving self's server
stop servicing if a timeout is configured and got no
keep-alime in that inteval
"""
if boolify(gconf.use_rsync_xattrs) and not privileged():
raise GsyncdError("using rsync for extended attributes is not supported")
repce = RepceServer(self.server, sys.stdin, sys.stdout, int(gconf.sync_jobs))
t = syncdutils.Thread(target=lambda: (repce.service_loop(),
syncdutils.finalize()))
t.start()
logging.info("slave listening")
if gconf.timeout and int(gconf.timeout) > 0:
while True:
lp = self.server.last_keep_alive
time.sleep(int(gconf.timeout))
if lp == self.server.last_keep_alive:
logging.info("connection inactive for %d seconds, stopping" % int(gconf.timeout))
break
else:
select((), (), ())
class SlaveRemote(object):
"""mix-in class to implement an interface to a remote slave"""
def connect_remote(self, rargs=[], **opts):
"""connects to a remote slave
Invoke an auxiliary utility (slave gsyncd, possibly wrapped)
which sets up the connection and set up a RePCe client to
communicate throuh its stdio.
"""
slave = opts.get('slave', self.url)
extra_opts = []
so = getattr(gconf, 'session_owner', None)
if so:
extra_opts += ['--session-owner', so]
if boolify(gconf.use_rsync_xattrs):
extra_opts.append('--use-rsync-xattrs')
po = Popen(rargs + gconf.remote_gsyncd.split() + extra_opts + \
['-N', '--listen', '--timeout', str(gconf.timeout), slave],
stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
gconf.transport = po
return self.start_fd_client(po.stdout, po.stdin, **opts)
def start_fd_client(self, i, o, **opts):
"""set up RePCe client, handshake with server
It's cut out as a separate method to let
subclasses hook into client startup
"""
self.server = RepceClient(i, o)
rv = self.server.__version__()
exrv = {'proto': repce.repce_version, 'object': Server.version()}
da0 = (rv, exrv)
da1 = ({}, {})
for i in range(2):
for k, v in da0[i].iteritems():
da1[i][k] = int(v)
if da1[0] != da1[1]:
raise GsyncdError("RePCe major version mismatch: local %s, remote %s" % (exrv, rv))
def rsync(self, files, *args):
"""invoke rsync"""
if not files:
raise GsyncdError("no files to sync")
logging.debug("files: " + ", ".join(files))
argv = gconf.rsync_command.split() + \
['-avR0', '--inplace', '--files-from=-', '--super','--stats', '--numeric-ids', '--no-implied-dirs'] + \
gconf.rsync_options.split() + (boolify(gconf.use_rsync_xattrs) and ['--xattrs'] or []) + \
['.'] + list(args)
po = Popen(argv, stdin=subprocess.PIPE,stderr=subprocess.PIPE)
for f in files:
po.stdin.write(f)
po.stdin.write('\0')
po.stdin.close()
po.wait()
po.terminate_geterr(fail_on_err = False)
return po
def tarssh(self, files, slaveurl):
"""invoke tar+ssh
-z (compress) can be use if needed, but ommitting it now
as it results in wierd error (tar+ssh errors out (errcode: 2)
"""
if not files:
raise GsyncdError("no files to sync")
logging.debug("files: " + ", ".join(files))
(host, rdir) = slaveurl.split(':')
tar_cmd = ["tar", "-cf", "-", "--files-from", "-"]
ssh_cmd = gconf.ssh_command_tar.split() + [host, "tar", "--overwrite", "-xf", "-", "-C", rdir]
p0 = Popen(tar_cmd, stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
p1 = Popen(ssh_cmd, stdin=p0.stdout, stderr=subprocess.PIPE)
for f in files:
p0.stdin.write(f)
p0.stdin.write('\n')
p0.stdin.close()
# wait() for tar to terminate, collecting any errors, further
# waiting for transfer to complete
p0.wait()
p0.terminate_geterr(fail_on_err = False)
p1.wait()
p1.terminate_geterr(fail_on_err = False)
return p1
class AbstractUrl(object):
"""abstract base class for url scheme classes"""
def __init__(self, path, pattern):
m = re.search(pattern, path)
if not m:
raise GsyncdError("malformed path")
self.path = path
return m.groups()
@property
def scheme(self):
return type(self).__name__.lower()
def canonical_path(self):
return self.path
def get_url(self, canonical=False, escaped=False):
"""format self's url in various styles"""
if canonical:
pa = self.canonical_path()
else:
pa = self.path
u = "://".join((self.scheme, pa))
if escaped:
u = syncdutils.escape(u)
return u
@property
def url(self):
return self.get_url()
### Concrete resource classes ###
class FILE(AbstractUrl, SlaveLocal, SlaveRemote):
"""scheme class for file:// urls
can be used to represent a file slave server
on slave side, or interface to a remote file
file server on master side
"""
class FILEServer(Server):
"""included server flavor"""
pass
server = FILEServer
def __init__(self, path):
sup(self, path, '^/')
def connect(self):
"""inhibit the resource beyond"""
os.chdir(self.path)
def rsync(self, files):
return sup(self, files, self.path)
class GLUSTER(AbstractUrl, SlaveLocal, SlaveRemote):
"""scheme class for gluster:// urls
can be used to represent a gluster slave server
on slave side, or interface to a remote gluster
slave on master side, or to represent master
(slave-ish features come from the mixins, master
functionality is outsourced to GMaster from master)
"""
class GLUSTERServer(Server):
"server enhancements for a glusterfs backend"""
@classmethod
def _attr_unpack_dict(cls, xattr, extra_fields = ''):
"""generic volume mark fetching/parsing backed"""
fmt_string = cls.NTV_FMTSTR + extra_fields
buf = Xattr.lgetxattr('.', xattr, struct.calcsize(fmt_string))
vm = struct.unpack(fmt_string, buf)
m = re.match('(.{8})(.{4})(.{4})(.{4})(.{12})', "".join(['%02x' % x for x in vm[2:18]]))
uuid = '-'.join(m.groups())
volinfo = { 'version': vm[0:2],
'uuid' : uuid,
'retval' : vm[18],
'volume_mark': vm[19:21],
}
if extra_fields:
return volinfo, vm[-len(extra_fields):]
else:
return volinfo
@classmethod
def foreign_volume_infos(cls):
"""return list of valid (not expired) foreign volume marks"""
dict_list = []
xattr_list = Xattr.llistxattr_buf('.')
for ele in xattr_list:
if ele.find('.'.join([cls.GX_NSPACE, 'volume-mark', ''])) == 0:
d, x = cls._attr_unpack_dict(ele, cls.FRGN_XTRA_FMT)
now = int(time.time())
if x[0] > now:
logging.debug("volinfo[%s] expires: %d (%d sec later)" % \
(d['uuid'], x[0], x[0] - now))
d['timeout'] = x[0]
dict_list.append(d)
else:
try:
Xattr.lremovexattr('.', ele)
except OSError:
pass
return dict_list
@classmethod
def native_volume_info(cls):
"""get the native volume mark of the underlying gluster volume"""
try:
return cls._attr_unpack_dict('.'.join([cls.GX_NSPACE, 'volume-mark']))
except OSError:
ex = sys.exc_info()[1]
if ex.errno != ENODATA:
raise
server = GLUSTERServer
def __init__(self, path):
self.host, self.volume = sup(self, path, '^(%s):(.+)' % HostRX.pattern)
def canonical_path(self):
return ':'.join([gethostbyname(self.host), self.volume])
def can_connect_to(self, remote):
"""determine our position in the connectibility matrix"""
return not remote or \
(isinstance(remote, SSH) and isinstance(remote.inner_rsc, GLUSTER))
class Mounter(object):
"""Abstract base class for mounter backends"""
def __init__(self, params):
self.params = params
self.mntpt = None
@classmethod
def get_glusterprog(cls):
return os.path.join(gconf.gluster_command_dir, cls.glusterprog)
def umount_l(self, d):
"""perform lazy umount"""
po = Popen(self.make_umount_argv(d), stderr=subprocess.PIPE)
po.wait()
return po
@classmethod
def make_umount_argv(cls, d):
raise NotImplementedError
def make_mount_argv(self, *a):
raise NotImplementedError
def cleanup_mntpt(self, *a):
pass
def handle_mounter(self, po):
po.wait()
def inhibit(self, *a):
"""inhibit a gluster filesystem
Mount glusterfs over a temporary mountpoint,
change into the mount, and lazy unmount the
filesystem.
"""
mpi, mpo = os.pipe()
mh = Popen.fork()
if mh:
os.close(mpi)
fcntl.fcntl(mpo, fcntl.F_SETFD, fcntl.FD_CLOEXEC)
d = None
margv = self.make_mount_argv(*a)
if self.mntpt:
# mntpt is determined pre-mount
d = self.mntpt
os.write(mpo, d + '\0')
po = Popen(margv, **self.mountkw)
self.handle_mounter(po)
po.terminate_geterr()
logging.debug('auxiliary glusterfs mount in place')
if not d:
# mntpt is determined during mount
d = self.mntpt
os.write(mpo, d + '\0')
os.write(mpo, 'M')
t = syncdutils.Thread(target=lambda: os.chdir(d))
t.start()
tlim = gconf.starttime + int(gconf.connection_timeout)
while True:
if not t.isAlive():
break
if time.time() >= tlim:
syncdutils.finalize(exval = 1)
time.sleep(1)
os.close(mpo)
_, rv = syncdutils.waitpid(mh, 0)
if rv:
rv = (os.WIFEXITED(rv) and os.WEXITSTATUS(rv) or 0) - \
(os.WIFSIGNALED(rv) and os.WTERMSIG(rv) or 0)
logging.warn('stale mount possibly left behind on ' + d)
raise GsyncdError("cleaning up temp mountpoint %s failed with status %d" % \
(d, rv))
else:
rv = 0
try:
os.setsid()
os.close(mpo)
mntdata = ''
while True:
c = os.read(mpi, 1)
if not c:
break
mntdata += c
if mntdata:
mounted = False
if mntdata[-1] == 'M':
mntdata = mntdata[:-1]
assert(mntdata)
mounted = True
assert(mntdata[-1] == '\0')
mntpt = mntdata[:-1]
assert(mntpt)
if mounted:
po = self.umount_l(mntpt)
po.terminate_geterr(fail_on_err = False)
if po.returncode != 0:
po.errlog()
rv = po.returncode
self.cleanup_mntpt(mntpt)
except:
logging.exception('mount cleanup failure:')
rv = 200
os._exit(rv)
logging.debug('auxiliary glusterfs mount prepared')
class DirectMounter(Mounter):
"""mounter backend which calls mount(8), umount(8) directly"""
mountkw = {'stderr': subprocess.PIPE}
glusterprog = 'glusterfs'
@staticmethod
def make_umount_argv(d):
return ['umount', '-l', d]
def make_mount_argv(self):
self.mntpt = tempfile.mkdtemp(prefix = 'gsyncd-aux-mount-')
return [self.get_glusterprog()] + ['--' + p for p in self.params] + [self.mntpt]
def cleanup_mntpt(self, mntpt = None):
if not mntpt:
mntpt = self.mntpt
os.rmdir(mntpt)
class MountbrokerMounter(Mounter):
"""mounter backend using the mountbroker gluster service"""
mountkw = {'stderr': subprocess.PIPE, 'stdout': subprocess.PIPE}
glusterprog = 'gluster'
@classmethod
def make_cli_argv(cls):
return [cls.get_glusterprog()] + gconf.gluster_cli_options.split() + ['system::']
@classmethod
def make_umount_argv(cls, d):
return cls.make_cli_argv() + ['umount', d, 'lazy']
def make_mount_argv(self, label):
return self.make_cli_argv() + \
['mount', label, 'user-map-root=' + syncdutils.getusername()] + self.params
def handle_mounter(self, po):
self.mntpt = po.stdout.readline()[:-1]
po.stdout.close()
sup(self, po)
if po.returncode != 0:
# if cli terminated with error due to being
# refused by glusterd, what it put
# out on stdout is a diagnostic message
logging.error('glusterd answered: %s' % self.mntpt)
def connect(self):
"""inhibit the resource beyond
Choose mounting backend (direct or mountbroker),
set up glusterfs parameters and perform the mount
with given backend
"""
label = getattr(gconf, 'mountbroker', None)
if not label and not privileged():
label = syncdutils.getusername()
mounter = label and self.MountbrokerMounter or self.DirectMounter
params = gconf.gluster_params.split() + \
(gconf.gluster_log_level and ['log-level=' + gconf.gluster_log_level] or []) + \
['log-file=' + gconf.gluster_log_file, 'volfile-server=' + self.host,
'volfile-id=' + self.volume, 'client-pid=-1']
mounter(params).inhibit(*[l for l in [label] if l])
def connect_remote(self, *a, **kw):
sup(self, *a, **kw)
self.slavedir = "/proc/%d/cwd" % self.server.pid()
def gmaster_instantiate_tuple(self, slave):
"""return a tuple of the 'one shot' and the 'main crawl' class instance"""
return (gmaster_builder('xsync')(self, slave), gmaster_builder()(self, slave))
def service_loop(self, *args):
"""enter service loop
- if slave given, instantiate GMaster and
pass control to that instance, which implements
master behavior
- else do that's what's inherited
"""
if args:
slave = args[0]
if gconf.local_path:
class brickserver(FILE.FILEServer):
local_path = gconf.local_path
aggregated = self.server
@classmethod
def entries(cls, path):
e = super(brickserver, cls).entries(path)
# on the brick don't mess with /.glusterfs
if path == '.':
try:
e.remove('.glusterfs')
except ValueError:
pass
return e
@classmethod
def lstat(cls, e):
""" path based backend stat """
return super(brickserver, cls).lstat(e)
@classmethod
def gfid(cls, e):
""" path based backend gfid fetch """
return super(brickserver, cls).gfid(e)
@classmethod
def linkto_check(cls, e):
return super(brickserver, cls).linkto_check(e)
if gconf.slave_id:
# define {,set_}xtime in slave, thus preempting
# the call to remote, so that it takes data from
# the local brick
slave.server.xtime = types.MethodType(lambda _self, path, uuid: brickserver.xtime(path, uuid + '.' + gconf.slave_id), slave.server)
slave.server.stime = types.MethodType(lambda _self, path, uuid: brickserver.stime(path, uuid + '.' + gconf.slave_id), slave.server)
slave.server.set_stime = types.MethodType(lambda _self, path, uuid, mark: brickserver.set_stime(path, uuid + '.' + gconf.slave_id, mark), slave.server)
(g1, g2) = self.gmaster_instantiate_tuple(slave)
g1.master.server = brickserver
g2.master.server = brickserver
else:
(g1, g2) = self.gmaster_instantiate_tuple(slave)
g1.master.server.aggregated = gmaster.master.server
g2.master.server.aggregated = gmaster.master.server
# bad bad bad: bad way to do things like this
# need to make this elegant
# register the crawlers and start crawling
g1.register()
g2.register()
g1.crawlwrap(oneshot=True)
g2.crawlwrap()
else:
sup(self, *args)
def rsync(self, files):
return sup(self, files, self.slavedir)
def tarssh(self, files):
return sup(self, files, self.slavedir)
class SSH(AbstractUrl, SlaveRemote):
"""scheme class for ssh:// urls
interface to remote slave on master side
implementing an ssh based proxy
"""
def __init__(self, path):
self.remote_addr, inner_url = sup(self, path,
'^((?:%s@)?%s):(.+)' % tuple([ r.pattern for r in (UserRX, HostRX) ]))
self.inner_rsc = parse_url(inner_url)
self.volume = inner_url[1:]
@staticmethod
def parse_ssh_address(self):
m = re.match('([^@]+)@(.+)', self.remote_addr)
if m:
u, h = m.groups()
else:
u, h = syncdutils.getusername(), self.remote_addr
self.remotehost = h
return {'user': u, 'host': h}
def canonical_path(self):
rap = self.parse_ssh_address(self)
remote_addr = '@'.join([rap['user'], gethostbyname(rap['host'])])
return ':'.join([remote_addr, self.inner_rsc.get_url(canonical=True)])
def can_connect_to(self, remote):
"""determine our position in the connectibility matrix"""
return False
def start_fd_client(self, *a, **opts):
"""customizations for client startup
- be a no-op if we are to daemonize (client startup is deferred
to post-daemon stage)
- determine target url for rsync after consulting server
"""
if opts.get('deferred'):
return a
sup(self, *a)
ityp = type(self.inner_rsc)
if ityp == FILE:
slavepath = self.inner_rsc.path
elif ityp == GLUSTER:
slavepath = "/proc/%d/cwd" % self.server.pid()
else:
raise NotImplementedError
self.slaveurl = ':'.join([self.remote_addr, slavepath])
def connect_remote(self, go_daemon=None):
"""connect to inner slave url through outer ssh url
Wrap the connecting utility in ssh.
Much care is put into daemonizing: in that case
ssh is started before daemonization, but
RePCe client is to be created after that (as ssh
interactive password auth would be defeated by
a daemonized ssh, while client should be present
only in the final process). In that case the action
is taken apart to two parts, this method is ivoked
once pre-daemon, once post-daemon. Use @go_daemon
to deiced what part to perform.
[NB. ATM gluster product does not makes use of interactive
authentication.]
"""
if go_daemon == 'done':
return self.start_fd_client(*self.fd_pair)
syncdutils.setup_ssh_ctl(tempfile.mkdtemp(prefix='gsyncd-aux-ssh-'),
self.remote_addr,
self.inner_rsc.url)
deferred = go_daemon == 'postconn'
ret = sup(self, gconf.ssh_command.split() + gconf.ssh_ctl_args + [self.remote_addr],
slave=self.inner_rsc.url, deferred=deferred)
if deferred:
# send a message to peer so that we can wait for
# the answer from which we know connection is
# established and we can proceed with daemonization
# (doing that too early robs the ssh passwd prompt...)
# However, we'd better not start the RepceClient
# before daemonization (that's not preserved properly
# in daemon), we just do a an ad-hoc linear put/get.
i, o = ret
inf = os.fdopen(i)
repce.send(o, None, '__repce_version__')
select((inf,), (), ())
repce.recv(inf)
# hack hack hack: store a global reference to the file
# to save it from getting GC'd which implies closing it
gconf.permanent_handles.append(inf)
self.fd_pair = (i, o)
return 'should'
def rsync(self, files):
return sup(self, files, '-e', " ".join(gconf.ssh_command.split() + gconf.ssh_ctl_args),
*(gconf.rsync_ssh_options.split() + [self.slaveurl]))
def tarssh(self, files):
return sup(self, files, self.slaveurl)
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