astarte-platform/astarte

Port astarte_pairing to Xandra

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#268 opened on Mar 5, 2020

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app:pairingdatabasegood first issueinternals

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Description

In light of the gradual demise of CQEx in favor of Xandra, astarte_pairing should be adapted to use Xandra instead of CQEx.

This mainly translates to:

  • Add Xandra as a dependency
  • Start the Xandra connection
  • Translate all queries from CQEx to Xandra, both in lib and in test.

To see an example of a service already using Xandra, have a look at astarte_housekeeping (and this PR https://github.com/astarte-platform/astarte/commit/8a5fbd52aecd where the replacement of CQEx with Xandra happened)

Contributor guide

Research direction
First, study the existing `astarte housekeeping` service and its PR for migrating from CQEx to Xandra to understand the pattern. Then, replace CQEx queries with Xandra queries in `lib` and `test` directories of `astarte pairing`, ensuring the Xandra connection is started properly.
Tech stack
elixir
Domain
backenddatabase
Issue type
Refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ElixirCQExXandraCassandra
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50