def get(self, fp, off=0, size=-1):
"""
Get object by `fingerprint`
- Throws `ObjectNotFound` RADOS exception, if no object with that fingerprint exists
- Return decompressed object
- Return the whole object by default
- If you specify `off` and `size` it is applied only after fetching the whole object
"""
self.log.debug("GET [%r]: %s:%s", fp, off, size)
obj_size, _ = self.ioctx.stat(fp)
compression_id = CAS._convert_meta(self.ioctx.get_xattr(fp, "cas.meta.compression"))
decompressor = Compressor.select(compression_id)
self.log.debug("GET [%r]: size %d compressed with %r", fp, obj_size, compression_id)
compressed_data = self.ioctx.read(fp, obj_size, 0)
data = decompressor.decompress(compressed_data)
if size < 0:
size = len(data)
return data[off:off+size]
def get(self, fp, off=0, size=-1):
"""
Get object by `fingerprint`
- Throws `ObjectNotFound` RADOS exception, if no object with that fingerprint exists
- Return decompressed object
- Return the whole object by default
- If you specify `off` and `size` it is applied only after fetching the whole object
"""
self.log.debug("GET [%r]: %s:%s", fp, off, size)
obj_size, _ = self.ioctx.stat(fp)
compression_id = CAS._convert_meta(
self.ioctx.get_xattr(fp, "cas.meta.compression"))
decompressor = Compressor.select(compression_id)
self.log.debug("GET [%r]: size %d compressed with %r", fp, obj_size,
compression_id)
compressed_data = self.ioctx.read(fp, obj_size, 0)
data = decompressor.decompress(compressed_data)
if size < 0:
size = len(data)
return data[off:off + size]
def __init__(self, ioctx, compression="no"):
"""
Initialize CAS object. Caller needs to provide a connected and initialized
RADOS I/O context.
CAS objects need their own, exclusive RADOS I/O Context, since they operate on
objects in an extra namespace.
On initialization you can also specify the compression algorithm for
**new** objects. CAS never overwrites objects that already exists, but rather
increments their reference count. Existing objects have metadata to
select the right decompressor on `get`.
"""
self.ioctx = ioctx
self.ioctx.set_namespace("CAS")
self.compressor = Compressor.select(compression)
def __init__(self, ioctx, compression="no"):
"""
Initialize CAS object. Caller needs to provide a connected and initialized
RADOS I/O context.
CAS objects need their own, exclusive RADOS I/O Context, since they operate on
objects in an extra namespace.
On initialization you can also specify the compression algorithm for
**new** objects. CAS never overwrites objects that already exists, but rather
increments their reference count. Existing objects have metadata to
select the right decompressor on `get`.
"""
self.ioctx = ioctx
self.ioctx.set_namespace("CAS")
self.compressor = Compressor.select(compression)
