root / tools / lib / transfer.py @ f546c15e
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# Copyright 2011 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import os |
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from hashmap import HashMap |
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from binascii import hexlify, unhexlify |
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from cStringIO import StringIO |
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from client import Fault |
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def upload(client, file, container, prefix): |
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meta = client.retrieve_container_metadata(container) |
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blocksize = int(meta['x-container-block-size']) |
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blockhash = meta['x-container-block-hash']
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size = os.path.getsize(file)
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hashes = HashMap(blocksize, blockhash) |
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hashes.load(file)
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map = {'bytes': size, 'hashes': [hexlify(x) for x in hashes]} |
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object = prefix + os.path.split(file)[-1] |
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try:
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client.create_object_by_hashmap(container, object, map) |
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except Fault, fault:
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if fault.status != 409: |
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raise
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else:
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return
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missing = fault.data.split('\n')
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if '' in missing: |
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del missing[missing.index(''):] |
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with open(file) as fp: |
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for hash in missing: |
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offset = hashes.index(unhexlify(hash)) * blocksize
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fp.seek(offset) |
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block = fp.read(blocksize) |
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client.create_object(container, '.upload', StringIO(block))
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client.create_object_by_hashmap(container, object, map) |
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def download(client, container, object, file): |
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meta = client.retrieve_container_metadata(container) |
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blocksize = int(meta['x-container-block-size']) |
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blockhash = meta['x-container-block-hash']
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if os.path.isfile(file): |
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size = os.path.getsize(file)
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hashes = HashMap(blocksize, blockhash) |
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hashes.load(file)
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else:
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size = 0
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hashes = [] |
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map = client.retrieve_object_hashmap(container, object)
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with open(file, 'a') as fp: |
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for i, h in enumerate(map): |
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if i < len(hashes) and h == hashes[i]: |
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continue
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start = i * blocksize |
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end = '' if i == len(map) - 1 else (i + 1) * blocksize |
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data = client.retrieve_object(container, object, range='bytes=%s-%s' % (start, end)) |
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fp.seek(start) |
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fp.write(data) |