New blobservers

[tgulacsi78]

Hi,

Anyone interested in a few simple utility blobserver implementations?

https://pkg.go.dev/github.com/tgulacsi/camproxy/blobserver

contains

  - badger - a persistent, Badger (github.com/dgraph-io/badger/v2) based blobserver. Like leveldb, but with separate value store (like leveldb + diskpacked), with proper deletion - so ideal for temporal (cache) use.

  - trace - a simple tracing blobserver that calls the underlying storage, and the given functions.

  - limited - a count-limited blobserver that limits new additions to the underlying blobserver using the given eviction policy.
The default eviction policy is a simple LRU.

The license is the same as of Perkeep itself, so it would be easy to add it,

if any of these implementations proves useful.

Tamás