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import logging | |
import math | |
import mimetypes | |
from multiprocessing import Pool | |
import os | |
from boto.s3.connection import S3Connection | |
def _upload_part(bucketname, aws_key, aws_secret, multipart_id, part_num, | |
source_path, offset, bytes, amount_of_retries=10): | |
""" | |
Uploads a part with retries. | |
""" | |
def _upload(retries_left=amount_of_retries): | |
try: | |
logging.info('Start uploading part #%d ...' % part_num) | |
conn = S3Connection(aws_key, aws_secret) | |
bucket = conn.get_bucket(bucketname) | |
for mp in bucket.get_all_multipart_uploads(): | |
if mp.id == multipart_id: | |
with open(source_path, 'r') as fp: | |
fp.seek(offset) | |
mp.upload_part_from_file(fp=fp, part_num=part_num, size=bytes) | |
break | |
except Exception, exc: | |
if retries_left: | |
_upload(retries_left=retries_left - 1) | |
else: | |
logging.info('... Failed uploading part #%d' % part_num) | |
raise exc | |
else: | |
logging.info('... Uploaded part #%d' % part_num) | |
_upload() | |
def upload(bucketname, aws_key, aws_secret, source_path, keyname, | |
acl='private', headers={}, guess_mimetype=True, parallel_processes=4): | |
""" | |
Parallel multipart upload. | |
""" | |
conn = S3Connection(aws_key, aws_secret) | |
bucket = conn.get_bucket(bucketname) | |
if guess_mimetype: | |
mtype = mimetypes.guess_type(keyname)[0] or 'application/octet-stream' | |
headers.update({'Content-Type': mtype}) | |
mp = bucket.initiate_multipart_upload(keyname, headers=headers) | |
source_size = os.stat(source_path).st_size | |
bytes_per_chunk = max(int(math.sqrt(5242880) * math.sqrt(source_size)), | |
5242880) | |
chunk_amount = int(math.ceil(source_size / float(bytes_per_chunk))) | |
pool = Pool(processes=parallel_processes) | |
for i in range(chunk_amount): | |
offset = i * bytes_per_chunk | |
remaining_bytes = source_size - offset | |
bytes = min([bytes_per_chunk, remaining_bytes]) | |
part_num = i + 1 | |
pool.apply_async(_upload_part, [bucketname, aws_key, aws_secret, mp.id, | |
part_num, source_path, offset, bytes]) | |
pool.close() | |
pool.join() | |
if len(mp.get_all_parts()) == chunk_amount: | |
mp.complete_upload() | |
key = bucket.get_key(keyname) | |
key.set_acl(acl) | |
else: | |
mp.cancel_upload() |
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