Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Branch: master
164 lines (143 sloc) 6.023 kB
#!/usr/bin/env python
"""Split large file into multiple pieces for upload to S3.
S3 only supports 5Gb files for uploading directly, so for larger CloudBioLinux
box images we need to use boto's multipart file support.
This parallelizes the task over available cores using multiprocessing.
It checks for an up to date version of the file remotely, skipping transfer
if found.
Usage:
s3_multipart_upload.py <file_to_transfer> <bucket_name> [<s3_key_name>]
if <s3_key_name> is not specified, the filename will be used.
--norr -- Do not use reduced redundancy storage.
--public -- Make uploaded files public.
--cores=n -- Number of cores to use for upload
Files are stored at cheaper reduced redundancy storage by default.
"""
import os
import sys
import glob
import subprocess
import contextlib
import functools
import multiprocessing
from multiprocessing.pool import IMapIterator
from optparse import OptionParser
import rfc822
import boto
def main(transfer_file, bucket_name, s3_key_name=None, use_rr=True,
make_public=True, cores=None):
if s3_key_name is None:
s3_key_name = os.path.basename(transfer_file)
conn = boto.connect_s3()
bucket = conn.lookup(bucket_name)
if bucket is None:
bucket = conn.create_bucket(bucket_name)
if s3_has_uptodate_file(bucket, transfer_file, s3_key_name):
print "S3 has up to date version of %s in %s. Not transferring." % \
(s3_key_name, bucket.name)
return
mb_size = os.path.getsize(transfer_file) / 1e6
if mb_size < 50:
_standard_transfer(bucket, s3_key_name, transfer_file, use_rr)
else:
_multipart_upload(bucket, s3_key_name, transfer_file, mb_size, use_rr,
cores)
s3_key = bucket.get_key(s3_key_name)
if make_public:
s3_key.set_acl("public-read")
def s3_has_uptodate_file(bucket, transfer_file, s3_key_name):
"""Check if S3 has an existing, up to date version of this file.
"""
s3_key = bucket.get_key(s3_key_name)
if s3_key:
s3_size = s3_key.size
local_size = os.path.getsize(transfer_file)
s3_time = rfc822.mktime_tz(rfc822.parsedate_tz(s3_key.last_modified))
local_time = os.path.getmtime(transfer_file)
return s3_size == local_size and s3_time >= local_time
return False
def upload_cb(complete, total):
sys.stdout.write(".")
sys.stdout.flush()
def _standard_transfer(bucket, s3_key_name, transfer_file, use_rr):
print " Upload with standard transfer, not multipart",
new_s3_item = bucket.new_key(s3_key_name)
new_s3_item.set_contents_from_filename(transfer_file, reduced_redundancy=use_rr,
cb=upload_cb, num_cb=10)
print
def map_wrap(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
return apply(f, *args, **kwargs)
return wrapper
def mp_from_ids(mp_id, mp_keyname, mp_bucketname):
"""Get the multipart upload from the bucket and multipart IDs.
This allows us to reconstitute a connection to the upload
from within multiprocessing functions.
"""
conn = boto.connect_s3()
bucket = conn.lookup(mp_bucketname)
mp = boto.s3.multipart.MultiPartUpload(bucket)
mp.key_name = mp_keyname
mp.id = mp_id
return mp
@map_wrap
def transfer_part(mp_id, mp_keyname, mp_bucketname, i, part):
"""Transfer a part of a multipart upload. Designed to be run in parallel.
"""
mp = mp_from_ids(mp_id, mp_keyname, mp_bucketname)
print " Transferring", i, part
with open(part) as t_handle:
mp.upload_part_from_file(t_handle, i+1)
os.remove(part)
def _multipart_upload(bucket, s3_key_name, tarball, mb_size, use_rr=True,
cores=None):
"""Upload large files using Amazon's multipart upload functionality.
"""
def split_file(in_file, mb_size, split_num=5):
prefix = os.path.join(os.path.dirname(in_file),
"%sS3PART" % (os.path.basename(s3_key_name)))
# require a split size between 5Mb (AWS minimum) and 250Mb
split_size = int(max(min(mb_size / (split_num * 2.0), 250), 5))
if not os.path.exists("%saa" % prefix):
cl = ["split", "-b%sm" % split_size, in_file, prefix]
subprocess.check_call(cl)
return sorted(glob.glob("%s*" % prefix))
mp = bucket.initiate_multipart_upload(s3_key_name, reduced_redundancy=use_rr)
with multimap(cores) as pmap:
for _ in pmap(transfer_part, ((mp.id, mp.key_name, mp.bucket_name, i, part)
for (i, part) in
enumerate(split_file(tarball, mb_size, cores)))):
pass
mp.complete_upload()
@contextlib.contextmanager
def multimap(cores=None):
"""Provide multiprocessing imap like function.
The context manager handles setting up the pool, worked around interrupt issues
and terminating the pool on completion.
"""
if cores is None:
cores = max(multiprocessing.cpu_count() - 1, 1)
def wrapper(func):
def wrap(self, timeout=None):
return func(self, timeout=timeout if timeout is not None else 1e100)
return wrap
IMapIterator.next = wrapper(IMapIterator.next)
pool = multiprocessing.Pool(cores)
yield pool.imap
pool.terminate()
if __name__ == "__main__":
parser = OptionParser()
parser.add_option("-r", "--norr", dest="use_rr",
action="store_false", default=True)
parser.add_option("-p", "--public", dest="make_public",
action="store_true", default=False)
parser.add_option("-c", "--cores", dest="cores",
default=multiprocessing.cpu_count())
(options, args) = parser.parse_args()
if len(args) < 2:
print __doc__
sys.exit()
kwargs = dict(use_rr=options.use_rr, make_public=options.make_public,
cores=int(options.cores))
main(*args, **kwargs)
Jump to Line
Something went wrong with that request. Please try again.