Query Node API

[hraberg]

There needs to be a way to query the data.

The simplest approach is to assume every participant is running their own query node as a library, and use the API directly.

Another approach is some from of remote API, either just taking Datalog over REST and returning EDN, or GraphQL (but likely not for MVP).

[hraberg]

For the MVP we're currently assuming the the query language itself will be a subset of Datomic's EDN dialect of Datalog.

[hraberg]

We want to add a simple crux.client ns that allow access to this REST API and to submit things into the Kafka cluster. This might be far from the end goal, but makes the system usable.

[hraberg]

This issue is redundant short term, we have #1974 for MVP.

[hraberg]

The API can look something like this:

/query with both POST (body) and GET with q query param.
/ GET for the status.
/tx-log POST with tx-ops going to Kafka.

We could maybe support both edn and JSON for the status page, via Accept headers, but not too important.