3 # Copyright 2011 GRNET S.A. All rights reserved.
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6 # without modification, are permitted provided that the following
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36 from binascii import hexlify
38 from sqlalchemy import create_engine
39 from sqlalchemy import Table, Column, String, MetaData
40 from sqlalchemy.sql import select
42 from pithos import settings
43 from pithos.backends.modular import ModularBackend
45 from lib.hashmap import HashMap
48 class Migration(object):
49 def __init__(self, db):
50 self.engine = create_engine(db)
51 self.metadata = MetaData(self.engine)
52 #self.engine.echo = True
53 self.conn = self.engine.connect()
55 options = getattr(settings, 'BACKEND', None)[1]
56 self.backend = ModularBackend(*options)
61 class DataMigration(Migration):
62 def __init__(self, db):
63 Migration.__init__(self, db)
64 # XXX Need more columns for primary key - last modified timestamp...
66 columns.append(Column('path', String(2048), primary_key=True))
67 columns.append(Column('hash', String(255)))
68 self.files = Table('files', self.metadata, *columns)
69 self.metadata.create_all(self.engine)
71 def cache_put(self, path, hash):
73 s = self.files.delete().where(self.files.c.path==path)
74 r = self.conn.execute(s)
76 s = self.files.insert()
77 r = self.conn.execute(s, {'path': path, 'hash': hash})
80 def cache_get(self, path):
81 s = select([self.files.c.hash], self.files.c.path == path)
82 r = self.conn.execute(s)
90 blocksize = self.backend.block_size
91 blockhash = self.backend.hash_algorithm
93 # Loop for all available files.
94 for path in ['README', 'store', 'test']:
95 map = HashMap(blocksize, blockhash)
97 hash = hexlify(map.hash())
99 if hash != self.cache_get(path):
100 missing = self.backend.blocker.block_ping(map) # XXX Backend hack...
101 status = '[>] ' + path
103 status += ' - %d block(s) missing' % len(missing)
104 with open(path) as fp:
106 offset = map.index(h) * blocksize
108 block = fp.read(blocksize)
109 self.backend.put_block(block)
111 status += ' - no blocks missing'
112 self.cache_put(path, hash)
114 status = '[-] ' + path
117 if __name__ == "__main__":
118 db = 'sqlite:///migrate.db'
120 dt = DataMigration(db)