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import re
import os
import sys
import pwd
import stat
import time
import errno
import struct
import socket
import logging
import tempfile
from errno import EEXIST, ENOENT, ENODATA, ENOTDIR, ELOOP, EISDIR
from gconf import gconf
import repce
from repce import RepceServer, RepceClient
from master import GMaster
import syncdutils
from syncdutils import select
UrlRX = re.compile('\A(\w+)://(.*)')
HostRX = re.compile('[a-z\d](?:[a-z\d.-]*[a-z\d])?', re.I)
UserRX = re.compile("[\w!\#$%&'*+-\/=?^_`{|}~]+")
def sup(x, *a, **kw):
return getattr(super(type(x), x), sys._getframe(1).f_code.co_name)(*a, **kw)
def desugar(ustr):
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 RuntimeError("cannot resolve sugared url '%s'" % ustr)
ap = os.path.normpath(ustr)
if ap.startswith('//'):
ap = ap[1:]
return "file://" + ap
def parse_url(ustr):
m = UrlRX.match(ustr)
if not m:
ustr = desugar(ustr)
m = UrlRX.match(ustr)
if not m:
raise RuntimeError("malformed url")
sch, path = m.groups()
this = sys.modules[__name__]
if not hasattr(this, sch.upper()):
raise RuntimeError("unknown url scheme " + sch)
return getattr(this, sch.upper())(path)
class _MetaXattr(object):
# load Xattr stuff on-demand
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)
Xattr = _MetaXattr()
class Server(object):
GX_NSPACE = "trusted.glusterfs"
NTV_FMTSTR = "!" + "B"*19 + "II"
FRGN_XTRA_FMT = "I"
FRGN_FMTSTR = NTV_FMTSTR + FRGN_XTRA_FMT
@staticmethod
def entries(path):
# 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
def purge(cls, path, entries=None):
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
def _create(cls, path, ctor):
try:
ctor(path)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == EEXIST:
cls.purge(path)
return ctor(path)
raise
@classmethod
def mkdir(cls, path):
cls._create(path, os.mkdir)
@classmethod
def symlink(cls, lnk, path):
cls._create(path, lambda p: os.symlink(lnk, p))
@classmethod
def xtime(cls, path, uuid):
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
def set_xtime(cls, path, uuid, mark):
Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), struct.pack('!II', *mark))
@staticmethod
def setattr(path, adct):
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):
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():
return 1.0
class SlaveLocal(object):
def can_connect_to(self, remote):
return not remote
def service_loop(self):
repce = RepceServer(self.server, sys.stdin, sys.stdout, int(gconf.sync_jobs))
t = syncdutils.Thread(target=repce.service_loop)
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):
def connect_remote(self, rargs=[], **opts):
slave = opts.get('slave', self.url)
ix, ox = os.pipe()
iy, oy = os.pipe()
pid = os.fork()
if not pid:
os.close(ox)
os.dup2(ix, sys.stdin.fileno())
os.close(iy)
os.dup2(oy, sys.stdout.fileno())
so = getattr(gconf, 'session_owner', None)
if so:
so_args = ['--session-owner', so]
else:
so_args = []
argv = rargs + gconf.remote_gsyncd.split() + so_args + \
['-N', '--listen', '--timeout', str(gconf.timeout), slave]
os.execvp(argv[0], argv)
os.close(ix)
os.close(oy)
return self.start_fd_client(iy, ox, **opts)
def start_fd_client(self, i, o, **opts):
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 RuntimeError("RePCe major version mismatch: local %s, remote %s" % (exrv, rv))
def rsync(self, files, *args):
if not files:
raise RuntimeError("no files to sync")
logging.debug("files: " + ", ".join(files))
argv = gconf.rsync_command.split() + gconf.rsync_extra.split() + ['-aR'] + files + list(args)
return os.spawnvp(os.P_WAIT, argv[0], argv) == 0
class AbstractUrl(object):
def __init__(self, path, pattern):
m = re.search(pattern, path)
if not m:
raise RuntimeError("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):
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):
class FILEServer(Server):
pass
server = FILEServer
def __init__(self, path):
sup(self, path, '^/')
def connect(self):
os.chdir(self.path)
def rsync(self, files):
return sup(self, files, self.path)
class GLUSTER(AbstractUrl, SlaveLocal, SlaveRemote):
class GLUSTERServer(Server):
@classmethod
def _attr_unpack_dict(cls, xattr, extra_fields = ''):
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):
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))
dict_list.append(d)
else:
try:
Xattr.lremovexattr('.', ele)
except OSError:
pass
return dict_list
@classmethod
def native_volume_info(cls):
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([socket.gethostbyname(self.host), self.volume])
def can_connect_to(self, remote):
return True
def connect(self):
def umount_l(d):
time.sleep(0.2) # XXX temporary workaround
argv = ['umount', '-l', d]
return os.spawnvp(os.P_WAIT, argv[0], argv)
d = tempfile.mkdtemp(prefix='gsyncd-aux-mount-')
mounted = False
try:
argv = gconf.gluster_command.split() + \
(gconf.gluster_log_level and ['-L', gconf.gluster_log_level] or []) + \
['-l', gconf.gluster_log_file, '-s', self.host,
'--volfile-id', self.volume, '--client-pid=-1', d]
if os.spawnvp(os.P_WAIT, argv[0], argv):
raise RuntimeError("command failed: " + " ".join(argv))
mounted = True
logging.debug('auxiliary glusterfs mount in place')
os.chdir(d)
if umount_l(d) != 0:
raise RuntimeError("umounting %s failed" % d)
mounted = False
finally:
try:
if mounted:
umount_l(d)
os.rmdir(d)
except:
logging.warn('stale mount possibly left behind on ' + d)
logging.debug('auxiliary glusterfs mount prepared')
def connect_remote(self, *a, **kw):
sup(self, *a, **kw)
self.slavedir = "/proc/%d/cwd" % self.server.pid()
def service_loop(self, *args):
if args:
GMaster(self, args[0]).crawl_loop()
else:
sup(self, *args)
def rsync(self, files):
return sup(self, files, self.slavedir)
class SSH(AbstractUrl, SlaveRemote):
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)
def canonical_path(self):
m = re.match('([^@]+)@(.+)', self.remote_addr)
if m:
u, h = m.groups()
else:
u, h = pwd.getpwuid(os.geteuid()).pw_name, self.remote_addr
remote_addr = '@'.join([u, socket.gethostbyname(h)])
return ':'.join([remote_addr, self.inner_rsc.get_url(canonical=True)])
def can_connect_to(self, remote):
return False
def start_fd_client(self, *a, **opts):
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):
if go_daemon == 'done':
return self.start_fd_client(*self.fd_pair)
gconf.setup_ssh_ctl(tempfile.mkdtemp(prefix='gsyncd-aux-ssh-'))
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, '-ze', " ".join(gconf.ssh_command.split() + gconf.ssh_ctl_args), self.slaveurl)
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