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synchro daemon.py
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synchro daemon.py
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import os
import win32file
import win32api
import win32con
import threading
import queue
import time
import shutil
import tempfile
import collections
import hashlib
import winreg
ACTIONS = {
1 : "create",
2 : "delete",
3 : "update",
4 : "rename", #from
5 : "rename" #to
}
FILE_LIST_DIRECTORY = 0x0001
class StoppableThread(threading.Thread):
# Quick subclass to make ctrl-c work & close off infinite loops.
def __init__(self):
threading.Thread.__init__(self)
self.stop_event = threading.Event()
def stop(self):
if self.isAlive() == True:
# set event to signal thread to terminate
self.stop_event.set()
# block calling thread until thread really has terminated
self.join()
class WatcherThread(StoppableThread):
def __init__(self, eventq, watch_path, blist):
StoppableThread.__init__(self)
self.eventq = eventq
self.path_test = watch_path
self.blist = blist # queue
self.hDir = win32file.CreateFile(
self.path_test,
FILE_LIST_DIRECTORY,
win32con.FILE_SHARE_READ |
win32con.FILE_SHARE_WRITE |
win32con.FILE_SHARE_DELETE,
None,
win32con.OPEN_EXISTING,
win32con.FILE_FLAG_BACKUP_SEMANTICS,
None
)
def run(self):
place = None
blist = []
while self.stop_event.is_set() == False:
#
# ReadDirectoryChangesW takes a previously-created
# handle to a directory, a buffer size for results,
# a flag to indicate whether to watch subtrees and
# a filter of what changes to notify.
#
# NB Tim Juchcinski reports that he needed to up
# the buffer size to be sure of picking up all
# events when a large number of files were
# deleted at once.
#
results = win32file.ReadDirectoryChangesW(
self.hDir,
1024,
True,
win32con.FILE_NOTIFY_CHANGE_FILE_NAME |
win32con.FILE_NOTIFY_CHANGE_DIR_NAME |
win32con.FILE_NOTIFY_CHANGE_ATTRIBUTES |
win32con.FILE_NOTIFY_CHANGE_SIZE |
win32con.FILE_NOTIFY_CHANGE_LAST_WRITE |
win32con.FILE_NOTIFY_CHANGE_SECURITY,
None,
None
)
# Maintain changes to in-memory blacklist
while self.blist.empty() == False:
bl = self.blist.get()
if bl[0] == 1:
blist.append(bl[1])
else:
blist.remove(bl[1])
for action, file in results:
# Messy but necessary
if bl == file:
continue
if (action == 4) and (place is None):
place = file
continue
elif (action == 4) and (place is not None):
event = [action + 1, self.path_test, place, file]
place = None
elif (action == 5) and (place is not None):
event = [action, self.path_test, file, place]
place = None
elif (action == 5) and (place is None):
place = file
continue
else:
event = [action, self.path_test, file, None]
self.eventq.put(event)
class WPollThread(StoppableThread):
def __init__(self, eventq, watch_path, blist):
StoppableThread.__init__(self)
self.eventq = eventq
self.path_test = watch_path
self.blist = blist # queue
self.before = dict ([(f, None) for f in os.listdir (path_to_watch)])
self.time = time.time()
def run(self):
# If polling weren't evil, I'd be quite pleased with this
# Pity it doesn't handle rename as well as it should, and only
# keys updates off mtime, but I'll take what I can get.
place = None
blist = []
while self.stop_event.is_set() == False:
time.sleep(10)
after = dict([(f, None) for f in os.listdir (path_to_watch)])
while self.blist.empty() == False:
bl = self.blist.get()
if bl[0] == 1:
blist.append(bl[1])
else:
blist.remove(bl[1])
added = [f for f in after if not f in before and not f in blist]
removed = [f for f in before if not f in after and not f in blist]
updated = [f for f in after if f in before and os.path.getmtime(f) > self.time]
if added:
# Create event
for f in added:
self.eventq.put([1, self.path_test, f, None])
if removed:
# Create event
for f in removed:
self.eventq.put([2, self.path_test, f, None])
if updated:
# Create event
for f in updated:
self.eventq.put([3, self.path_test, f, None])
self.before = after
self.time = time.time()
class ActorThread(StoppableThread):
def __init__(self, eventq, sync_dirs, rsync_handle, blists):
StoppableThread.__init__(self)
self.eventq = eventq
self.sync_dirs = sync_dirs
self.rsync = rsync_handle
self.blists = blists
def blist_add(self, file):
rec = (1, file)
for q in self.blists:
q.put(rec)
def blist_sub(self, file):
rec = (0, file)
for q in self.blists:
q.put(rec)
def run(self):
while self.stop_event.is_set() == False:
event = self.eventq.get(True)
for target in self.sync_dirs:
# Exclude source dir & unknown events
if event[1] == target:
continue
if ACTIONS.get(event[0], None) is None:
continue
method = "{}".format(ACTIONS[event[0]])
msg = "Event out: Trying {0} in {1} from {2}".format(method,
target,
event[1])
print(msg)
result = getattr(self, method)(event, target)
# FIXME: Do something with result
# Tempted to add something about time-wait exceptions later
print(result)
self.eventq.task_done()
def create(self, cevent, target_dir):
dest_file = os.path.join(target_dir, cevent[2])
source_file = os.path.join(cevent[1], cevent[2])
# Handle directories
if os.path.isdir(source_file):
if source_file.endswith("Conflict]"):
return "Not copying conflict directory"
elif os.path.exists(dest_file):
dest_file += "[{} Conflict]".format(time.ctime())
try:
shutil.copytree(source_file, dest_file)
except:
return "Copytree failed"
else:
return "Directory copied fine"
# Handle files
(sr, se) = os.path.splitext(source_file)
if sr.endswith("Conflict]"):
# Event triggered because another directory has a conflict; ignore
return "Not copying conflict file"
if os.path.exists(dest_file):
# Filename conflict? use os.stat
s_stat = os.stat(source_file)
d_stat = os.stat(dest_file)
if (s_stat[6] == d_stat[6]) and (s_stat[8] == d_stat[8]):
# Size and mtime agree
return "File already exists"
else:
# Append a "Time Conflict" tag to the end of the filename
(root, ext) = os.path.splitext(dest_file)
root += "[{} Conflict]".format(time.ctime())
dest_file = root + ext
try:
shutil.copy2(source_file, dest_file)
except (IOError, os.error) as why:
return str(why)
except Error as err:
return str(err.args[0])
else:
return "Create succeeded"
def delete(self, cevent, target_dir):
trash_file = os.path.join(target_dir, cevent[2])
if not os.path.exists(trash_file):
return "File already deleted"
if os.path.isdir(trash_file):
try:
shutil.rmtree(trash_file)
except Error as err:
return str(err.args[0])
else:
return "Directory trashed"
try:
os.remove(trash_file)
except IOError as err:
err = "Error removing " + trash_file + " File still in use."
return err
else:
return "File trashed"
def update(self, cevent, target_dir):
dest_file = os.path.join(target_dir, cevent[2])
source_file = os.path.join(cevent[1], cevent[2])
# This operation requires a third file (blame PyRsync below)...
dfh = open(dest_file, "rb")
sfh = open(source_file, "rb")
tf = tempfile.TemporaryFile()
hashes = self.rsync.blockchecksums(dfh)
delta = self.rsync.rsyncdelta(sfh, hashes)
sfh.close()
if len(delta) == 1:
dfh.close()
return "Nothing to update"
self.blist_add(cevent[2])
dfh.seek(0)
self.rsync.patchstream(dfh, tf, delta)
dfh.close()
tf.seek(0)
dfh = open(dest_file, "w+b")
try:
shutil.copyfileobj(tf, dfh)
except IOError as err:
err = "Error removing " + tf + " File still in use."
out = err
else:
out = "File object copied"
tf.close()
dfh.close()
return out
def rename(self, cevent, target_dir):
old_name = os.path.join(target_dir, cevent[3])
new_name = os.path.join(target_dir, cevent[2])
if (not os.path.exists(old_name)) and (os.path.exists(new_name)):
# Rename's already done here.
return "File already renamed"
if os.path.exists(new_name) and os.path.exists(old_name):
# ... I have no idea how we've got here.
# Screw it. Call the new name a conflict.
(root, ext) = os.path.splitext(new_name)
root += "[{} Conflict]".format(time.ctime())
new_name = root + ext
try:
shutil.move(old_name, new_name)
except IOError as err:
err = "Error moving " + old_name + " File still in use."
return err
else:
return "File renamed"
class PyRsync(object):
"""
This is a pure Python implementation of the [rsync algorithm](TM96).
[TM96] Andrew Tridgell and Paul Mackerras. The rsync algorithm.
Technical Report TR-CS-96-05, Canberra 0200 ACT, Australia, 1996.
http://samba.anu.edu.au/rsync/.
### Example Use Case: ###
# On the system containing the file that needs to be patched
>>> unpatched = open("unpatched.file", "rb")
>>> hashes = blockchecksums(unpatched)
# On the remote system after having received `hashes`
>>> patchedfile = open("patched.file", "rb")
>>> delta = rsyncdelta(patchedfile, hashes)
# System with the unpatched file after receiving `delta`
>>> unpatched.seek(0)
>>> save_to = open("locally-patched.file", "wb")
>>> patchstream(unpatched, save_to, delta)
"""
def __init__(self):
self.__all__ = ["rollingchecksum",
"weakchecksum",
"patchstream",
"rsyncdelta",
"blockchecksums"]
def rsyncdelta(self, datastream, remotesignatures, blocksize=4096):
"""
Generates a binary patch when supplied with the weak and strong
hashes from an unpatched target and a readable stream for the
up-to-date data. The blocksize must be the same as the value
used to generate remotesignatures.
"""
remote_weak, remote_strong = remotesignatures
match = True
matchblock = -1
deltaqueue = collections.deque()
while True:
if match and datastream is not None:
# Whenever there is a match or the loop is running for the first
# time, populate the window using weakchecksum instead of rolling
# through every single byte which takes at least twice as long.
window = collections.deque(bytes(datastream.read(blocksize)))
checksum, a, b = self.weakchecksum(window)
try:
# If there are two identical weak checksums in a file, and the
# matching strong hash does not occur at the first match, it will
# be missed and the data sent over. May fix eventually, but this
# problem arises very rarely.
matchblock = remote_weak.index(checksum, matchblock + 1)
stronghash = hashlib.md5(bytes(window)).hexdigest()
matchblock = remote_strong.index(stronghash, matchblock)
match = True
deltaqueue.append(matchblock)
if datastream.closed:
break
continue
except ValueError:
# The weakchecksum did not match
match = False
try:
if datastream:
# Get the next byte and affix to the window
newbyte = ord(datastream.read(1))
window.append(newbyte)
except TypeError:
# No more data from the file; the window will slowly shrink.
# newbyte needs to be zero from here on to keep the checksum
# correct.
newbyte = 0
tailsize = datastream.tell() % blocksize
datastream = None
if datastream is None and len(window) <= tailsize:
# The likelihood that any blocks will match after this is
# nearly nil so call it quits.
deltaqueue.append(window)
break
# Yank off the extra byte and calculate the new window checksum
oldbyte = window.popleft()
checksum, a, b = self.rollingchecksum(oldbyte, newbyte, a, b, blocksize)
# Add the old byte the file delta. This is data that was not found
# inside of a matching block so it needs to be sent to the target.
try:
deltaqueue[-1].append(oldbyte)
except (AttributeError, IndexError):
deltaqueue.append([oldbyte])
# Return a delta that starts with the blocksize and converts all iterables
# to bytes.
deltastructure = [blocksize]
for element in deltaqueue:
if isinstance(element, int):
deltastructure.append(element)
elif element:
deltastructure.append(bytes(element))
return deltastructure
def blockchecksums(self, instream, blocksize=4096):
"""
Returns a list of weak and strong hashes for each block of the
defined size for the given data stream.
"""
weakhashes = list()
stronghashes = list()
read = instream.read(blocksize)
while read:
weakhashes.append(self.weakchecksum(bytes(read))[0])
stronghashes.append(hashlib.md5(read).hexdigest())
read = instream.read(blocksize)
return weakhashes, stronghashes
def patchstream(self, instream, outstream, delta):
"""
Patches instream using the supplied delta and write the resultantant
data to outstream.
"""
blocksize = delta[0]
for element in delta[1:]:
if isinstance(element, int) and blocksize:
instream.seek(element * blocksize)
element = instream.read(blocksize)
outstream.write(element)
def rollingchecksum(self, removed, new, a, b, blocksize=4096):
"""
Generates a new weak checksum when supplied with the internal state
of the checksum calculation for the previous window, the removed
byte, and the added byte.
"""
a -= removed - new
b -= removed * blocksize - a
return (b << 16) | a, a, b
def weakchecksum(self, data):
"""
Generates a weak checksum from an iterable set of bytes.
"""
a = b = 0
l = len(data)
for i in range(l):
a += data[i]
b += (l - i)*data[i]
return (b << 16) | a, a, b
def main():
(time, watch_dirs) = read_config()
r = PyRsync()
eventq = queue.Queue()
do_exit = False
# Build list of changes
actionlist = build_actions(list(watch_dirs.keys()))
for a in actionlist:
eventq.put(action)
watchers = []
watchqueues = []
for d in watch_dirs:
wq = queue.Queue()
if watch_dirs[d] == "0":
w = WatcherThread(eventq, d, wq)
else:
w = WPollThread(eventq, d, wq)
watchqueues.append(wq)
w.start()
watchers.append(w)
a = ActorThread(eventq, list(watch_dirs.keys()), r, watchqueues)
a.start()
while do_exit == False:
try:
time.sleep(0.1)
except:
do_exit = True
for w in watchers:
w.stop()
a.stop()
t_0 = str(time.time())
write_time(t_0)
def build_actions(dirs, time):
actions = []
changed = []
st = []
conf = {}
# Build manifests of each dir.
for dir in dirs:
(c, s) = create_manifests(dir)
changed.append(c)
st.append(s)
# Four cases, handled below.
# 1) file is in manifest & static (update)
# 2) file is in manifest & manifest (conflicted update)
# 3) file is in manifest & None (create)
# 4) File is in None & static (delete)
###################
# CASE 1 / CASE 3 #
###################
# As we're comparing against the other st,
# use range(len) to get a key in.
for i in range(len(changed)):
j = (i+1) % 2
for m in changed[i]:
# If case 1, remove from static.
# Trust me, this makes finding deletes so much easier ITLR
if m[0] in st[j]:
event = [3, dirs[i], m[0], None]
st[j].remove(m[i])
# Case 2. We'll deal with conf in a bit.
elif m[0] in [x[0] for x in m[j]]:
conf[m[0]][i] = m[0]
# Case 3
elif m[0] not in st[j]:
event = [1, dirs[i], m[0], None]
# Something's b0rked
else:
print("This should never happen, a not in (a union a')")
pass
actions.append(event)
##########
# CASE 4 #
##########
# Remove elements where both files are in static; we don't touch them.
# Make a master list of [file, directory to delete from]
to_del = [[x, 1] for x in st[0] if x not in st[1]]
to_del += [[x, 0] for x in st[1] if x not in st[0]]
for file in to_del:
event = [2, dirs[file[1]], file[0], None]
actions.append(event)
##########
# CASE 2 #
##########
# Get "left" and "right" dicts where the key is the filename and the value
# is the file's mtime.
ldir = dict([(f, os.path.getmtime(f)) for f in changed[0] if os.path.getmtime(f) > time and f in changed[1]])
rdir = dict([(f, os.path.getmtime(f)) for f in changed[1] if os.path.getmtime(f) > time and f in changed[0]])
for f in ldir:
if ldir[f] == rdir[f]:
# Both updated at same time; probably due to crash/stopped process
# Skip the file
continue
elif ldir[f] > rdir[f]:
event = [3, dirs[0], f, None]
else:
event = [3, dirs[0], f, None]
actions.append(event)
def create_manifests(d, time):
changed = []
unchanged = []
# Format directory and walk it
# For each file, get its full filename including path
directory = os.path.normpath(d)
for dirname, dirnames, filenames in os.walk(directory):
for files in filenames:
fn = os.path.normpath(os.path.join(dirname, files))
# Get the name relative to start directory and the mtime.
# If mtime is newer than the last run time, add it to changed
# Otherwise add to static.
name = fn[len(nodeman["path"])+1:]
mtime = os.path.getmtime(fn)
if mtime > time:
changed.append([name, time])
else:
static.append(name)
return (changed, static)
def read_config():
path = '\Software\Synchro\Config'
dirs = {}
try:
with winreg.OpenKey(winreg.HKEY_CURRENT_USER,path) as k:
dirs[winreg.QueryValueEx(k, "dir1")[0]] = winreg.QueryValueEx(k, "dir1_t")[0]
dirs[winreg.QueryValueEx(k, "dir2")[0]] = winreg.QueryValueEx(k, "dir1_2")[0]
lastrun = float(winreg.QueryValueEx(k, "lastrun")[0])
except:
sys.exit("Could not read config")
return (lastrun, dirs)
def write_time(lastrun):
path = '\Software\Synchro\Config'
try:
with winreg.OpenKey(winreg.HKEY_CURRENT_USER, path) as k:
winreg.SetValueEx(k, "lastrun", 0, winreg.REG_SZ, lastrun)
except:
sys.exit("Could not write config")
if __name__ == "__main__":
main()