1 # Copyright 2011 GRNET S.A. All rights reserved.
3 # Redistribution and use in source and binary forms, with or
4 # without modification, are permitted provided that the following
7 # 1. Redistributions of source code must retain the above
8 # copyright notice, this list of conditions and the following
11 # 2. Redistributions in binary form must reproduce the above
12 # copyright notice, this list of conditions and the following
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14 # provided with the distribution.
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32 # or implied, of GRNET S.A.
36 from hashmap import HashMap
37 from binascii import hexlify, unhexlify
38 from cStringIO import StringIO
39 from client import Fault
42 def upload(client, file, container, prefix):
44 meta = client.retrieve_container_metadata(container)
45 blocksize = int(meta['x-container-block-size'])
46 blockhash = meta['x-container-block-hash']
48 size = os.path.getsize(file)
49 hashes = HashMap(blocksize, blockhash)
51 map = {'bytes': size, 'hashes': [hexlify(x) for x in hashes]}
53 object = prefix + os.path.split(file)[-1]
55 client.create_object_by_hashmap(container, object, map)
57 if fault.status != 409:
62 missing = fault.data.split('\n')
64 del missing[missing.index(''):]
66 with open(file) as fp:
68 offset = hashes.index(unhexlify(hash)) * blocksize
70 block = fp.read(blocksize)
71 client.create_object(container, '.upload', StringIO(block))
73 client.create_object_by_hashmap(container, object, map)
75 def download(client, container, object, file):
77 meta = client.retrieve_container_metadata(container)
78 blocksize = int(meta['x-container-block-size'])
79 blockhash = meta['x-container-block-hash']
81 if os.path.isfile(file):
82 size = os.path.getsize(file)
83 hashes = HashMap(blocksize, blockhash)
89 map = client.retrieve_object_hashmap(container, object)
91 with open(file, 'a') as fp:
92 for i, h in enumerate(map):
93 if i < len(hashes) and h == hashes[i]:
96 end = '' if i == len(map) - 1 else (i + 1) * blocksize
97 data = client.retrieve_object(container, object, range='bytes=%s-%s' % (start, end))