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rpipe.py
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rpipe.py
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#!/usr/bin/env python
#
# MIT License
#
# Copyright (c) 2017 Eric A. Borisch
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from __future__ import print_function
import argparse
import subprocess
import sys
import string
from hashlib import md5
from os import path,fsync,unlink
from StringIO import StringIO
epi="""
Works by creating temporary files of size --chunksize in --tempdir, and
uploading those. By default runs two 'jobs', such that an upload can be
occuring while the next chunk is being built. As such, tempdir needs to
be able to hold two chunks. They are deleted and checksum-ed along the
way, and verified during retrieval.
Make sure that your destination doesn't exist (purge it first.) This will
likely be added as a default step on a future version.
Examples:
<some source> | rpipe.py remote:some/empty/loc
<some source> | rpipe.py --nocheck crypt:an/encrypted/loc
^ As we can't check the md5s of the deposited files on an
encrypted store...
rpipe.py --replay remote:some/empty/loc | <some sink>
rpipe.py --replay --nocheck crypt:an/ecrypted/loc | <some sink>
"""
parser = argparse.ArgumentParser(description=
'Provides pipe in to / out of rclone destination',
epilog=epi, formatter_class=argparse.RawDescriptionHelpFormatter)
aa = parser.add_argument
aa('destination')
aa('-c', '--chunksize',
type=int, default=2**23,
help='Chunk size for splitting transfer [8MB]')
aa('-b', '--blocksize',
type=int, default=2**16,
help='Block size for read/write [64KB]')
aa('-t', '--tempdir',
nargs=1, default='/tmp',
help='Directory for storing temporary files')
aa('-r', '--replay',
action='store_true',
help='Write previous saved stream to stdout')
aa('-j', '--jobs',
type=int, default=2,
help='Number of simultaneous rclone jobs')
aa('-n', '--nocheck',
action='store_true',
help='Don\'t check md5 at end (eg. crypto store')
def mkname(n, width=6, prefix=''):
C = string.ascii_lowercase
s = [C[0]] * width
p = width - 1
n = int(n)
while n:
if p < 0:
raise(Exception, 'n too large for width!')
s[p] = C[n % 26]
n /= 26
p -= 1
return prefix + ''.join(s)
def readin(f, blk, tot, csums):
fout = open(f, 'w', blk)
maxlen = tot
while tot:
d = sys.stdin.read(min(blk,tot))
if len(d):
for c in csums:
c.update(d)
fout.write(d)
tot -= len(d)
else:
break
fout.flush()
fsync(fout.fileno())
fout.close()
return maxlen - tot
def upload(f, dst):
sp = subprocess.Popen(('rclone',
'copyto',
'--retries=10',
f,
path.join(dst,path.basename(f))))
return sp
def cat(remote, fd=sys.stdout, bs=65536, csums=[], async=False):
sp = subprocess.Popen(('rclone',
'cat',
'--retries=10',
remote),
stdout = subprocess.PIPE)
if async:
# Only set up the process; return the Popen object
return sp
buf = (1,)
tot = 0
while len(buf) > 0:
buf = sp.stdout.read(bs)
if len(buf):
tot += len(buf)
fd.write(buf)
for c in csums:
c.update(buf)
sp.wait()
return len
def complete(info, m):
if info[m][2]:
info[m][2].wait()
info[m][2] = None
unlink(info[m][0])
def check_pipe(remote):
remote_sums = {}
rmd5 = subprocess.check_output(('rclone',
'md5sum',
'--include=rp-*',
'--retries=10',
remote))
rmd5 = rmd5.split('\n')
for l in rmd5:
d = l.split()
if len(d) < 2:
continue
remote_sums[d[1]] = d[0]
buf = StringIO()
cat(path.join(remote, 'rpipe.md5'), fd=buf)
buf.seek(0)
md = {}
total = False
for l in buf:
d = l.split()
if len(d) < 2:
continue
if d[1] == 'TOTAL':
total = True
elif remote_sums[d[1]] != d[0]:
print("{} != {} [{}]".format(d[0], remote_sums[d[1]], d[1]))
raise(Exception, 'Checksums do not match (current vs. saved)!')
if not total:
raise(Exception, 'Incomplete "rpipe.sum" file (missing TOTAL)')
return buf
def deposit(args):
# Only output on stderr
sys.stdout = sys.stderr
subprocess.check_call(('rclone', 'mkdir', args.destination))
n = 0
flist = []
b = 1
totsum = md5()
totsize = 0
while b > 0:
flist.append([path.join(args.tempdir,mkname(n, prefix='rp-')),None,None])
csum = md5()
b = readin(flist[-1][0],
args.blocksize,
args.chunksize,
(csum, totsum))
if n >= args.jobs:
complete(flist, n - args.jobs)
if b:
totsize += b
flist[n][1] = csum.hexdigest()
flist[n][2] = upload(flist[-1][0], args.destination)
print('Sending chunk {} [{} bytes so far]'.format(n, totsize))
if n == 0:
# Wait for first (for directory creation)
flist[n][2].wait()
flist[n][2] = None
unlink(flist[n][0])
n+=1
else:
unlink(flist[-1][0])
for x in range(len(flist)):
complete(flist, x)
print('Sending complete. Depositing metadata.')
mdpath=path.join(args.tempdir, 'rpipe.md5')
md = open(mdpath, 'w')
for x in flist:
if x[1]:
print("{} {}".format(x[1], path.basename(x[0])), file=md)
print("{} {}".format(totsum.hexdigest(), 'TOTAL'), file=md)
md.flush()
fsync(md.fileno())
md.close()
final = upload(mdpath, args.destination)
final.wait()
unlink(mdpath)
if not args.nocheck:
print('Final checksum checks.')
check_pipe(args.destination)
print('Success. Checksums match.')
else:
print('Complete. Skipped checksum match.')
print('Wrote {} bytes into {}'.format(totsize, args.destination))
print('Full stream checksum: {}'.format(totsum.hexdigest()))
def replay(args):
if not args.nocheck:
print("Checking initial integrity.", file=sys.stderr)
buf = check_pipe(args.destination)
print('Success. Checksums match.', file=sys.stderr)
else:
buf = StringIO()
cat(path.join(args.destination, 'rpipe.md5'), fd=buf)
buf.seek(0)
md = {}
for l in buf:
d = l.split()
if not len(d):
continue
md[d[1]] = d[0]
n = 1
tsum = md5()
tsize = 0
for f in sorted(md.keys()):
if f == 'TOTAL':
continue
print("Retrieving {}/{} [{} bytes total]".format(n, len(md)-1, tsize),
file=sys.stderr)
p = cat(path.join(args.destination, f), async=True)
csum = md5()
buf = (1,)
while len(buf):
buf = p.stdout.read(args.blocksize)
if not len(buf):
continue
tsize += len(buf)
csum.update(buf)
tsum.update(buf)
sys.stdout.write(buf)
p.wait()
n += 1
if csum.hexdigest() != md[f]:
print('WARNING: Checksum mis-match!!', file=sys.stderr)
print('{} {} {}'.format(f,md[f],csum.hexdigest()), file=sys.stderr)
print("Retrieved {} bytes total".format(tsize),
file=sys.stderr)
if tsum.hexdigest() != md['TOTAL']:
print('WARNING: Full stream checksum mis-match!!', file=sys.stderr)
if __name__ == "__main__":
args = parser.parse_args()
if args.replay:
replay(args)
else:
deposit(args)