OFS Provides plugin-orientated low-level blobstore
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storage Python library object object storage Bucket bucket storage

OFS Description

Provides plugin-orientated low-level blobstore OFS is a bucket/object storage library.It provides a common API for doing storing bitstreams (+ a bit of related metadata) in 'bucket/object' stores such as: * Filesystem (+ pairtree) * S3-compatible: S3, Google Storage, Eucalytus, Archive.org * Riak (buggy) * 'REST' Store (see remote/reststore.py - implementation at http://bitbucket.org/pudo/repod/) * add a backend hereWhy use the library: * Abstraction: write common code but use different storage backends * More than a filesystem, less than a database - support for metadata as well bitstreams * Extra features:- Sharding - automatic sharding of files to support distributed file-system like structure (planned)Example Usage(local version - depends on 'pairtree', and 'simplejson'): >>> from ofs.local import OFS >>> o = OFS() (Equivalent to 'o = OFS(storage_dir = "data", uri_base="urn:uuid:", hashing_type="md5")') # Claim a bucket - this will add the bucket to the list of existing ones >>> uuid_id = o.claim_a_bucket() >>> uuid_id '4aaa43cdf5ba44e2ad25acdbd1cf2f70' # Choose a bucket name - if it exists, a new UUID one will be formed instead and returned >>> bucket_id = o.claim_a_bucket("foo") >>> bucket_id 'foo' >>> bucket_id = o.claim_a_bucket("foo") >>> bucket_id '1bf93208521545879e79c13614cd12f0' # Store a file: >>> o.put_stream(bucket_id, "foo.txt", open("foo....)) {'_label': 'foo.txt', '_content_length': 10, '_checksum': 'md5:10feda25f8da2e2ebfbe646eea351224', '_last_modified': '2010-08-02T11:37:21', '_creation_date': '2010-08-02T11:37:21'} # or: >>> o.put_stream(bucket_id, "foo.txt", "asidaisdiasjdiajsidjasidji") {'_label': 'foo.txt', '_content_length': 10, '_checksum': 'md5:10feda25f8da2e2ebfbe646eea351224', '_last_modified': '2010-08-02T11:37:21', '_creation_date': '2010-08-02T11:37:21'} # adding a file with some parameters: >>> o.put_stream(bucket_id, "foooo", "asidaisdiasjdiajsidjasidji", params={"original_uri":"http://...."}) {'_label': 'foooo', 'original_uri': 'http://....', '_last_modified': '2010-08-02T11:39:11', '_checksum': 'md5:3d690d7e0f4479c5a7038b8a4572d0fe', '_creation_date': '2010-08-02T11:39:11', '_content_length': 26} # Get the underlying URL pointing to a resource >>> o.get_url(bucket_id, "foo") "file:///opt/ofs_store/pairtree_root/1b/f9/32/......./obj/foo" "http://...""ftp://..." # adding to existing metadata: >>> o.update_metadata(bucket_id, "foooo", {'foo':'bar'}) {'_label': 'foooo', 'original_uri': 'http://....', '_last_modified': '2010-08-02T11:39:11', '_checksum': 'md5:3d690d7e0f4479c5a7038b8a4572d0fe', '_creation_date': '2010-08-02T11:39:11', '_content_length': 26, 'foo': 'bar'} # Remove keys >>> o.remove_metadata_keys(bucket_id, "foooo", ) {'_label': 'foooo', 'original_uri': 'http://....', '_last_modified': '2010-08-02T11:39:11', '_checksum': 'md5:3d690d7e0f4479c5a7038b8a4572d0fe', '_creation_date': '2010-08-02T11:39:11', '_content_length': 26} # Delete blob >>> o.exists(bucket_id, "foooo") True >>> o.del_stream(bucket_id, "foooo") >>> o.exists(bucket_id, "foooo") False # Iterate through ids for buckets held: >>> for item in o.list_buckets(): ... print item ... 447536aa0f1b411089d12399738ede8e 4a726b0a33974480a2a26d34fa0d494d 4aaa43cdf5ba44e2ad25acdbd1cf2f70 .... etc Requirements: · Python

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