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import py, os, stat, md5
from Queue import Queue
class RSync(object):
""" This class allows to send a directory structure (recursively)
to one or multiple remote filesystems.
There is limited support for symlinks, which means that symlinks
pointing to the sourcetree will be send "as is" while external
symlinks will be just copied (regardless of existance of such
a path on remote side).
"""
def __init__(self, sourcedir, callback=None, verbose=True):
self._sourcedir = str(sourcedir)
self._verbose = verbose
assert callback is None or callable(callback)
self._callback = callback
self._channels = {}
self._receivequeue = Queue()
self._links = []
def filter(self, path):
return True
def _end_of_channel(self, channel):
if channel in self._channels:
# too early! we must have got an error
channel.waitclose()
# or else we raise one
raise IOError('connection unexpectedly closed: %s ' % (
channel.gateway,))
def _process_link(self, channel):
for link in self._links:
channel.send(link)
# completion marker, this host is done
channel.send(42)
def _done(self, channel):
""" Call all callbacks
"""
finishedcallback = self._channels.pop(channel)
if finishedcallback:
finishedcallback()
def _list_done(self, channel):
# sum up all to send
if self._callback:
s = sum([self._paths[i] for i in self._to_send[channel]])
self._callback("list", s, channel)
def _send_item(self, channel, data):
""" Send one item
"""
modified_rel_path, checksum = data
modifiedpath = os.path.join(self._sourcedir, *modified_rel_path)
try:
f = open(modifiedpath, 'rb')
data = f.read()
except IOError:
data = None
# provide info to progress callback function
modified_rel_path = "/".join(modified_rel_path)
if data is not None:
self._paths[modified_rel_path] = len(data)
else:
self._paths[modified_rel_path] = 0
if channel not in self._to_send:
self._to_send[channel] = []
self._to_send[channel].append(modified_rel_path)
if data is not None:
f.close()
if checksum is not None and checksum == md5.md5(data).digest():
data = None # not really modified
else:
# ! there is a reason for the interning:
# sharing multiple copies of the file's data
data = intern(data)
self._report_send_file(channel.gateway, modified_rel_path)
channel.send(data)
def _report_send_file(self, gateway, modified_rel_path):
if self._verbose:
print '%s <= %s' % (gateway.remoteaddress, modified_rel_path)
def send(self, raises=True):
""" Sends a sourcedir to all added targets. Flag indicates
whether to raise an error or return in case of lack of
targets
"""
if not self._channels:
if raises:
raise IOError("no targets available, maybe you "
"are trying call send() twice?")
return
# normalize a trailing '/' away
self._sourcedir = os.path.dirname(os.path.join(self._sourcedir, 'x'))
# send directory structure and file timestamps/sizes
self._send_directory_structure(self._sourcedir)
# paths and to_send are only used for doing
# progress-related callbacks
self._paths = {}
self._to_send = {}
# send modified file to clients
while self._channels:
channel, req = self._receivequeue.get()
if req is None:
self._end_of_channel(channel)
else:
command, data = req
if command == "links":
self._process_link(channel)
elif command == "done":
self._done(channel)
elif command == "ack":
if self._callback:
self._callback("ack", self._paths[data], channel)
elif command == "list_done":
self._list_done(channel)
elif command == "send":
self._send_item(channel, data)
del data
else:
assert "Unknown command %s" % command
def add_target(self, gateway, destdir,
finishedcallback=None, **options):
""" Adds a remote target specified via a 'gateway'
and a remote destination directory.
"""
assert finishedcallback is None or callable(finishedcallback)
for name in options:
assert name in ('delete',)
def itemcallback(req):
self._receivequeue.put((channel, req))
channel = gateway.remote_exec(REMOTE_SOURCE)
channel.setcallback(itemcallback, endmarker = None)
channel.send((str(destdir), options))
self._channels[channel] = finishedcallback
def _broadcast(self, msg):
for channel in self._channels:
channel.send(msg)
def _send_link(self, basename, linkpoint):
self._links.append(("link", basename, linkpoint))
def _send_directory(self, path):
# dir: send a list of entries
names = []
subpaths = []
for name in os.listdir(path):
p = os.path.join(path, name)
if self.filter(p):
names.append(name)
subpaths.append(p)
self._broadcast(names)
for p in subpaths:
self._send_directory_structure(p)
def _send_link_structure(self, path):
linkpoint = os.readlink(path)
basename = path[len(self._sourcedir) + 1:]
if not linkpoint.startswith(os.sep):
# relative link, just send it
# XXX: do sth with ../ links
self._send_link(basename, linkpoint)
elif linkpoint.startswith(self._sourcedir):
self._send_link(basename, linkpoint[len(self._sourcedir) + 1:])
else:
self._send_link(basename, linkpoint)
self._broadcast(None)
def _send_directory_structure(self, path):
try:
st = os.lstat(path)
except OSError:
self._broadcast((0, 0))
return
if stat.S_ISREG(st.st_mode):
# regular file: send a timestamp/size pair
self._broadcast((st.st_mtime, st.st_size))
elif stat.S_ISDIR(st.st_mode):
self._send_directory(path)
elif stat.S_ISLNK(st.st_mode):
self._send_link_structure(path)
else:
raise ValueError, "cannot sync %r" % (path,)
REMOTE_SOURCE = py.path.local(__file__).dirpath().\
join('rsync_remote.py').open().read() + "\nf()"
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