commit c93daeea9bad9c5e2e926db2de030986f8cebc6f · hauleth.dev/esl_hn

lib/esl_hn/application.ex

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         @impl true

     

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         def start(_type, _args) do

     

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           refresh = Application.fetch_env!(:esl_hn, :refresh)

     

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           children = [

     

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             EslHnWeb.Telemetry,

     

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             {Phoenix.PubSub, name: EslHn.PubSub},

     

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             {EslHn.Cache, name: EslHn},

     

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             {EslHn.Refresher, refresh: refresh, cache: {EslHn.Cache, EslHn}},

     

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             EslHnWeb.Endpoint

     

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           ]

     

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+54

lib/esl_hn/refresher.ex

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       defmodule EslHn.Refresher do

     

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         use GenServer

     

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         alias EslHn.Hn

     

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         def start_link(opts),

     

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           do: GenServer.start_link(__MODULE__, opts)

     

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         @impl true

     

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         def init(opts) do

     

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           refresh = Access.fetch!(opts, :refresh)

     

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           {mod, tid} = Access.fetch!(opts, :cache)

     

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           {:ok,

     

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            %{

     

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              refresh: refresh,

     

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              ids: MapSet.new(),

     

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              cache: {mod, tid}

     

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            }, {:continue, :refresh}}

     

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         end

     

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         @impl true

     

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         def handle_info(:refresh, state) do

     

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           {:noreply, state, {:continue, :refresh}}

     

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         end

     

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         @impl true

     

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         def handle_continue(:refresh, state) do

     

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           {mod, tid} = state.cache

     

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           with {:ok, ids} <- Hn.top_stories_ids(),

     

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                new_set = MapSet.new(ids),

     

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                new = MapSet.difference(new_set, state.ids),

     

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                old = MapSet.difference(state.ids, new_set),

     

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                {:ok, stories} <- Hn.stories(new) do

     

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             rows =

     

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               for story <- stories, do: {story.id, story}

     

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             mod.write(tid, :index, ids)

     

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             :ok =

     

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               mod.write_all(tid, rows)

     

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             :ok =

     

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               mod.prune_all(tid, old)

     

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             EslHn.broadcast_new(for story <- stories, story.id in new, do: story)

     

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           end

     

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           Process.send_after(self(), :refresh, state.refresh)

     

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           {:noreply, state}

     

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         end

     

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       end