root / pithos / lib / transfer.py @ 2e662088
History | View | Annotate | Download (4 kB)
1 |
# Copyright 2011-2012 GRNET S.A. All rights reserved.
|
---|---|
2 |
#
|
3 |
# Redistribution and use in source and binary forms, with or
|
4 |
# without modification, are permitted provided that the following
|
5 |
# conditions are met:
|
6 |
#
|
7 |
# 1. Redistributions of source code must retain the above
|
8 |
# copyright notice, this list of conditions and the following
|
9 |
# disclaimer.
|
10 |
#
|
11 |
# 2. Redistributions in binary form must reproduce the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer in the documentation and/or other materials
|
14 |
# provided with the distribution.
|
15 |
#
|
16 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
17 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
18 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
19 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
20 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
21 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
22 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
23 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
24 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
26 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
27 |
# POSSIBILITY OF SUCH DAMAGE.
|
28 |
#
|
29 |
# The views and conclusions contained in the software and
|
30 |
# documentation are those of the authors and should not be
|
31 |
# interpreted as representing official policies, either expressed
|
32 |
# or implied, of GRNET S.A.
|
33 |
|
34 |
import os |
35 |
import types |
36 |
|
37 |
from hashmap import HashMap |
38 |
from binascii import hexlify, unhexlify |
39 |
from cStringIO import StringIO |
40 |
from client import Fault |
41 |
|
42 |
|
43 |
def upload(client, path, container, prefix, name=None, mimetype=None): |
44 |
|
45 |
meta = client.retrieve_container_metadata(container) |
46 |
blocksize = int(meta['x-container-block-size']) |
47 |
blockhash = meta['x-container-block-hash']
|
48 |
|
49 |
size = os.path.getsize(path) |
50 |
hashes = HashMap(blocksize, blockhash) |
51 |
hashes.load(open(path))
|
52 |
map = {'bytes': size, 'hashes': [hexlify(x) for x in hashes]} |
53 |
|
54 |
objectname = name if name else os.path.split(path)[-1] |
55 |
object = prefix + objectname |
56 |
kwargs = {'mimetype':mimetype} if mimetype else {} |
57 |
v = None
|
58 |
try:
|
59 |
v = client.create_object_by_hashmap(container, object, map, **kwargs) |
60 |
except Fault, fault:
|
61 |
if fault.status != 409: |
62 |
raise
|
63 |
else:
|
64 |
return v
|
65 |
|
66 |
if type(fault.data) == types.StringType: |
67 |
missing = fault.data.split('\n')
|
68 |
elif type(fault.data) == types.ListType: |
69 |
missing = fault.data |
70 |
|
71 |
if '' in missing: |
72 |
del missing[missing.index(''):] |
73 |
|
74 |
with open(path) as fp: |
75 |
for hash in missing: |
76 |
offset = hashes.index(unhexlify(hash)) * blocksize
|
77 |
fp.seek(offset) |
78 |
block = fp.read(blocksize) |
79 |
client.update_container_data(container, StringIO(block)) |
80 |
|
81 |
return client.create_object_by_hashmap(container, object, map, **kwargs) |
82 |
|
83 |
def download(client, container, object, path): |
84 |
|
85 |
res = client.retrieve_object_hashmap(container, object)
|
86 |
blocksize = int(res['block_size']) |
87 |
blockhash = res['block_hash']
|
88 |
bytes = res['bytes']
|
89 |
map = res['hashes']
|
90 |
|
91 |
if os.path.exists(path):
|
92 |
h = HashMap(blocksize, blockhash) |
93 |
h.load(open(path))
|
94 |
hashes = [hexlify(x) for x in h] |
95 |
else:
|
96 |
open(path, 'w').close() # Create an empty file |
97 |
hashes = [] |
98 |
|
99 |
with open(path, 'a+') as fp: |
100 |
if bytes != 0: |
101 |
for i, h in enumerate(map): |
102 |
if i < len(hashes) and h == hashes[i]: |
103 |
continue
|
104 |
start = i * blocksize |
105 |
end = '' if i == len(map) - 1 else ((i + 1) * blocksize) - 1 |
106 |
data = client.retrieve_object(container, object, range='bytes=%s-%s' % (start, end)) |
107 |
if i != len(map) - 1: |
108 |
data += (blocksize - len(data)) * '\x00' |
109 |
fp.seek(start) |
110 |
fp.write(data) |
111 |
fp.truncate(bytes)
|