1 # Copyright 2011 GRNET S.A. All rights reserved.
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4 # without modification, are permitted provided that the following
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37 from hashmap import HashMap
38 from binascii import hexlify, unhexlify
39 from cStringIO import StringIO
40 from client import Fault
43 def upload(client, file, container, prefix, name=None):
45 meta = client.retrieve_container_metadata(container)
46 blocksize = int(meta['x-container-block-size'])
47 blockhash = meta['x-container-block-hash']
49 size = os.path.getsize(file)
50 hashes = HashMap(blocksize, blockhash)
52 map = {'bytes': size, 'hashes': [hexlify(x) for x in hashes]}
54 objectname = name if name else os.path.split(file)[-1]
55 object = prefix + objectname
57 client.create_object_by_hashmap(container, object, map)
59 if fault.status != 409:
64 if type(fault.data) == types.StringType:
65 missing = fault.data.split('\n')
66 elif type(fault.data) == types.ListType:
70 del missing[missing.index(''):]
72 with open(file) as fp:
74 offset = hashes.index(unhexlify(hash)) * blocksize
76 block = fp.read(blocksize)
77 client.create_object(container, '.upload', StringIO(block))
79 client.create_object_by_hashmap(container, object, map)
81 def download(client, container, object, file):
83 meta = client.retrieve_container_metadata(container)
84 blocksize = int(meta['x-container-block-size'])
85 blockhash = meta['x-container-block-hash']
87 if os.path.isfile(file):
88 size = os.path.getsize(file)
89 hashes = HashMap(blocksize, blockhash)
95 map = client.retrieve_object_hashmap(container, object)
97 with open(file, 'a') as fp:
98 for i, h in enumerate(map):
99 if i < len(hashes) and h == hashes[i]:
101 start = i * blocksize
102 end = '' if i == len(map) - 1 else (i + 1) * blocksize
103 data = client.retrieve_object(container, object, range='bytes=%s-%s' % (start, end))