TrackingCovid API

praveenperera · March 15, 2020, 12:33am

Started out making a data visualization site using Phoenix LiveView and react: trackingcovid.com

But found someone else who was doing it better: https://covid-19charts.com

So we decided to work together, I am focusing on the API. I want to add a GraphQL endpoint soon.

patrickdm · March 15, 2020, 10:04am

Johns Hopkins dudes has done a pretty nice job with their dashboard. Just in case you haven’t checked it out yet. Stay safe, be responsible. from Italy.

praveenperera · March 17, 2020, 8:05pm

I added a GraphQL endpoint to it using absinthe. This was my first time working with GraphQL. The experience was pretty good. Thanks @benwilson512 and @bruce

However the GraphQL endpoint is much slower than the REST endpoint for getting cases and predicated cases. I haven’t had much of a chance to figure out why.

For the people with lots of experience with GraphQL if I’m doing anything obviously dumb please point it out for me. Thanks!

github.com

avencera/covid/blob/master/lib/covid_web/schema.ex

defmodule CovidWeb.Schema do
  use Absinthe.Schema
  use Absinthe.Schema.Notation
  alias Covid.Database.Day
  alias Covid.Database.Country
  alias Covid.Database.Country.Region

  import Absinthe.Resolution.Helpers, only: [dataloader: 1, dataloader: 3]

  import_types(Absinthe.Type.Custom)

  def context(ctx) do
    loader =
      Dataloader.new()
      |> Dataloader.add_source(Countries, Country.data())
      |> Dataloader.add_source(Regions, Region.data())
      |> Dataloader.add_source(Days, Day.data())

    Map.put(ctx, :loader, loader)
  end

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EDIT: I love elixir I was able to quickly and easily add a cache to make it faster:
https://github.com/avencera/covid/commit/f167f4929a05acc76f509f4592e70820c5d21783