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import re
import os
import sys
import stat
import time
import errno
import struct
import select
import socket
import logging
import tempfile
import threading
from ctypes import *
from ctypes.util import find_library
from errno import EEXIST, ENOENT, ENODATA, ENOTDIR, ELOOP
from gconf import gconf
import repce
from repce import RepceServer, RepceClient
from master import GMaster
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://#{str}"
else:
return "file://" + os.path.abspath(ustr)
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 Xattr(object):
libc = CDLL(find_library("libc"))
@classmethod
def geterrno(cls):
return c_int.in_dll(cls.libc, 'errno').value
@classmethod
def raise_oserr(cls):
errn = cls.geterrno()
raise OSError(errn, os.strerror(errn))
@classmethod
def lgetxattr(cls, path, attr, siz=0):
if siz:
buf = create_string_buffer('\0' * siz)
else:
buf = None
ret = cls.libc.lgetxattr(path, attr, buf, siz)
if ret == -1:
cls.raise_oserr()
if siz:
return buf.raw[:ret]
else:
return ret
@classmethod
def lsetxattr(cls, path, attr, val):
ret = cls.libc.lsetxattr(path, attr, val, len(val), 0)
if ret == -1:
cls.raise_oserr()
class Server(object):
GX_NSPACE = "trusted.glusterfs"
@staticmethod
def entries(path):
try:
return os.listdir(path)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOTDIR:
return []
else:
raise
@classmethod
def purge(cls, path, entries=None):
me_also = entries == None
if not entries:
try:
entries = os.listdir(path)
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:
raise
else:
raise
for e in entries:
cls.purge(os.path.join(path, e))
if me_also:
try:
os.rmdir(path)
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOTDIR:
try:
os.unlink(path)
return
except OSError:
ex = sys.exc_info()[1]
if ex.errno != ENOENT:
raise
elif ex.errno == ENOENT:
logging.debug ("Trying to delete a file which is not present")
else:
raise
@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):
return ex.errno
else:
raise
@classmethod
def set_xtime(cls, path, uuid, mark):
try:
Xattr.lsetxattr(path, '.'.join([cls.GX_NSPACE, uuid, 'xtime']), struct.pack('!II', *mark))
except OSError:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
logging.error ("File for which the setxattr to be done is not present")
@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()
lastping = 0
@classmethod
def ping(cls):
cls.lastping += 1
return cls.lastping
@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 = threading.Thread(target=repce.service_loop)
t.setDaemon(True)
t.start()
logging.info("slave listening")
if gconf.timeout and int(gconf.timeout) > 0:
while True:
lp = self.server.lastping
time.sleep(int(gconf.timeout))
if lp == self.server.lastping:
logging.info("connection inactive for %d seconds, stopping" % int(gconf.timeout))
break
else:
select.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())
argv = rargs + gconf.remote_gsyncd.split() + ['-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))
if gconf.timeout and int(gconf.timeout) > 0:
def pinger():
while True:
self.server.ping()
time.sleep(int(gconf.timeout) * 0.5)
t = threading.Thread(target=pinger)
t.setDaemon(True)
t.start()
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()
def scheme(self):
return type(self).__name__.lower()
def canonical_path(self):
return self.path
def get_url(self, canonical=False):
if canonical:
pa = self.canonical_path()
else:
pa = self.path
return "://".join((self.scheme(), pa))
@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 volume_info(cls):
vm = struct.unpack('!' + 'B'*19 + 'II',
Xattr.lgetxattr('.', '.'.join([cls.GX_NSPACE, 'volume-mark']), 27))
m = re.match('(.{8})(.{4})(.{4})(.{4})(.{12})', "".join(['%02x' % x for x in vm[2:18]]))
uuid = '-'.join(m.groups())
return { 'version': vm[0:2],
'uuid' : uuid,
'retval' : vm[18],
'volume_mark': vm[-2:] }
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):
d = tempfile.mkdtemp()
try:
argv = [gconf.gluster_command] + \
(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))
logging.debug('auxiliary glusterfs mount in place')
os.chdir(d)
argv = ['umount', '-l', d]
if os.spawnvp(os.P_WAIT, argv[0], argv):
raise RuntimeError("command failed: " + " ".join(argv))
finally:
try:
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()
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 = os.getlogin(), 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['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())
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, '__version__')
select.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._in_fd_reference = 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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