Exemple #1
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    def __init__(self, **params):
        self.rblocker = None
        try:
            if params['blockpool']:
                from radosblocker import RadosBlocker
                self.rblocker = RadosBlocker(**params)
        except KeyError:
            pass

        self.fblocker = FileBlocker(**params)
        self.hashlen = self.fblocker.hashlen
        self.blocksize = params['blocksize']
Exemple #2
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    def __init__(self, **params):
        self.rblocker = None
        try:
            if params['blockpool']:
                from radosblocker import RadosBlocker
                self.rblocker = RadosBlocker(**params)
	except KeyError:
            pass

        self.fblocker = FileBlocker(**params)
        self.hashlen = self.fblocker.hashlen
        self.blocksize = params['blocksize']
Exemple #3
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class Blocker(object):
    """Blocker.
       Required constructor parameters: blocksize, blockpath, hashtype.
       Optional blockpool.
    """

    def __init__(self, **params):
        self.rblocker = None
        try:
            if params['blockpool']:
                from radosblocker import RadosBlocker
                self.rblocker = RadosBlocker(**params)
	except KeyError:
            pass

        self.fblocker = FileBlocker(**params)
        self.hashlen = self.fblocker.hashlen
        self.blocksize = params['blocksize']

    def block_hash(self, data):
        """Hash a block of data"""
        return self.fblocker.block_hash(data)

    def block_ping(self, hashes):
        """Check hashes for existence and
           return those missing from block storage.
        """
        r = []
        if self.rblocker:
            r = self.rblocker.block_ping(hashes)
        f = self.fblocker.block_ping(hashes)
        return union(r, f)

    def block_retr(self, hashes):
        """Retrieve blocks from storage by their hashes."""
        return self.fblocker.block_retr(hashes)

    def block_stor(self, blocklist):
        """Store a bunch of blocks and return (hashes, missing).
           Hashes is a list of the hashes of the blocks,
           missing is a list of indices in that list indicating
           which blocks were missing from the store.
        """
        r_missing = []
        (hashes, f_missing) = self.fblocker.block_stor(blocklist)
        if self.rblocker:
            (_, r_missing) = self.rblocker.block_stor(blocklist)
        return (hashes, union(r_missing, f_missing))


    def block_delta(self, blkhash, offset, data):
        """Construct and store a new block from a given block
           and a data 'patch' applied at offset. Return:
           (the hash of the new block, if the block already existed)
        """
        blocksize = self.blocksize
        r_hash = None
        r_existed = True
        (f_hash, f_existed) = self.fblocker.block_delta(blkhash, offset, data)
        if self.rblocker:
            (r_hash, r_existed) = self.rblocker.block_delta(blkhash, offset, data)
        if not r_hash and not f_hash:
            return None, None
        if self.rblocker and not r_hash:
            block = self.fblocker.block_retr((blkhash,))
            if not block:
                return None, None
            block = block[0]
            newblock = block[:offset] + data
            if len(newblock) > blocksize:
                newblock = newblock[:blocksize]
            elif len(newblock) < blocksize:
                newblock += block[len(newblock):]
            r_hash, r_existed = self.rblocker.block_stor((newblock,))

        return f_hash, 1 if r_existed and f_existed else 0
Exemple #4
0
class Blocker(object):
    """Blocker.
       Required constructor parameters: blocksize, blockpath, hashtype.
       Optional blockpool.
    """
    def __init__(self, **params):
        self.rblocker = None
        try:
            if params['blockpool']:
                from radosblocker import RadosBlocker
                self.rblocker = RadosBlocker(**params)
        except KeyError:
            pass

        self.fblocker = FileBlocker(**params)
        self.hashlen = self.fblocker.hashlen
        self.blocksize = params['blocksize']

    def block_hash(self, data):
        """Hash a block of data"""
        return self.fblocker.block_hash(data)

    def block_ping(self, hashes):
        """Check hashes for existence and
           return those missing from block storage.
        """
        r = []
        if self.rblocker:
            r = self.rblocker.block_ping(hashes)
        f = self.fblocker.block_ping(hashes)
        return union(r, f)

    def block_retr(self, hashes):
        """Retrieve blocks from storage by their hashes."""
        return self.fblocker.block_retr(hashes)

    def block_stor(self, blocklist):
        """Store a bunch of blocks and return (hashes, missing).
           Hashes is a list of the hashes of the blocks,
           missing is a list of indices in that list indicating
           which blocks were missing from the store.
        """
        r_missing = []
        (hashes, f_missing) = self.fblocker.block_stor(blocklist)
        if self.rblocker:
            (_, r_missing) = self.rblocker.block_stor(blocklist)
        return (hashes, union(r_missing, f_missing))

    def block_delta(self, blkhash, offset, data):
        """Construct and store a new block from a given block
           and a data 'patch' applied at offset. Return:
           (the hash of the new block, if the block already existed)
        """
        blocksize = self.blocksize
        r_hash = None
        r_existed = True
        (f_hash, f_existed) = self.fblocker.block_delta(blkhash, offset, data)
        if self.rblocker:
            (r_hash,
             r_existed) = self.rblocker.block_delta(blkhash, offset, data)
        if not r_hash and not f_hash:
            return None, None
        if self.rblocker and not r_hash:
            block = self.fblocker.block_retr((blkhash, ))
            if not block:
                return None, None
            block = block[0]
            newblock = block[:offset] + data
            if len(newblock) > blocksize:
                newblock = newblock[:blocksize]
            elif len(newblock) < blocksize:
                newblock += block[len(newblock):]
            r_hash, r_existed = self.rblocker.block_stor((newblock, ))

        return f_hash, 1 if r_existed and f_existed else 0