RDF Delta Server HTTP API to get the current patch version

[edmondchuc]

Hi, I'm trying to work out the HTTP API for the RDF Delta server described in rdf-patch-logs.html.

It states,

Logs have a short name, which is local to the server. This name is preserved as logs are moved from server to server, making moving data through the development cycle easier such as staging and deployment installations, easier.

http://.../{shortName}/
          /{shortName}/init -- "version 0" but dataset vs patch.
          /{shortName}/current --  "highest version"
          /{shortName}/patch/{version} -- all digits.
          /{shortName}/patch/{id} -- A UUID string which has "-"

I'm assuming shortName here is the patch log name.

I've got a local RDF Delta server running on localhost port 1066. I've created a patch log named ds and I've appended data to it, so I know the latest version is 1, or that a patch log with id 1 exists, but I'm trying to work out how a downstream service can work that out by hitting the HTTP API.

The below examples have been sent with the Accept header set to text/plain.

I've tried both http://localhost:1066/ds/init and http://localhost:1066/ds/current and I get the following result:

HTTP ERROR 400 Not a log fetch or append operation : /ds/current
URI: http://localhost:1066/ds/current
STATUS: 400
MESSAGE: Not a log fetch or append operation : /ds/current

I've tried http://localhost:1066/blah/current and I get:

HTTP ERROR 404 Not found
URI: http://localhost:1066/blah/current
STATUS: 404
MESSAGE: Not found

So I know that /ds/... is actually referring to the patch log since it returns a 400 and not a 404, but I can't seem to work out how to get the current version as per the docs.

Likewise, I can make a request to http://localhost:1066/ds/1 where 1 is the patch id and it returns the patch log details, so I know it exists, but I can't hit the /ds/current to get the latest patch log id.

What am I doing wrong? Why a request to http://localhost:1066/ds/current is returning 400?

Thanks in advance.

[edmondchuc]

I've created a python wrapper for the Delta Server's RPC APIs for anyone who's interested. https://github.com/Kurrawong/rdf-delta-python.