1 # Copyright 2011-2012 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
13 # disclaimer in the documentation and/or other materials
14 # provided with the distribution.
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.
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.
36 from blocker import Blocker
37 from mapper import Mapper
41 Required constructor parameters: path, block_size, hash_algorithm.
44 def __init__(self, **params):
46 if path and not os.path.exists(path):
48 if not os.path.isdir(path):
49 raise RuntimeError("Cannot open path '%s'" % (path,))
51 p = {'blocksize': params['block_size'],
52 'blockpath': os.path.join(path + '/blocks'),
53 'hashtype': params['hash_algorithm']}
54 self.blocker = Blocker(**p)
55 p = {'mappath': os.path.join(path + '/maps'),
56 'namelen': self.blocker.hashlen}
57 self.mapper = Mapper(**p)
59 def map_get(self, name):
60 return self.mapper.map_retr(name)
62 def map_put(self, name, map):
63 self.mapper.map_stor(name, map)
65 def map_delete(self, name):
68 def block_get(self, hash):
69 blocks = self.blocker.block_retr((hash,))
74 def block_put(self, data):
75 hashes, absent = self.blocker.block_stor((data,))
78 def block_update(self, hash, offset, data):
79 h, e = self.blocker.block_delta(hash, ((offset, data),))
82 def block_search(self, map):
83 return self.blocker.block_ping(map)