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defmodule WalletNotifications.PreferenceStore do |
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@moduledoc """ |
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ETS-backed GenServer for user notification preferences. |
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Table: `:wallet_notif_preferences` — keyed by {user_id, channel}. |
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""" |
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use GenServer |
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alias WalletNotifications.Preference |
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@table :wallet_notif_preferences |
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def start_link(opts), do: GenServer.start_link(__MODULE__, opts, name: __MODULE__) |
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@spec upsert(Preference.t()) :: :ok |
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def upsert(%Preference{} = pref), do: GenServer.call(__MODULE__, {:upsert, pref}) |
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@spec get(user_id :: String.t(), channel :: atom()) :: {:ok, Preference.t()} | {:error, :not_found} |
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def get(user_id, channel), do: GenServer.call(__MODULE__, {:get, user_id, channel}) |
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@spec list_by_user(String.t()) :: [Preference.t()] |
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def list_by_user(user_id), do: GenServer.call(__MODULE__, {:list_by_user, user_id}) |
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def reset, do: GenServer.call(__MODULE__, :reset) |
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@impl true |
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def init(_) do |
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:ets.new(@table, [:set, :protected, :named_table]) |
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{:ok, %{}} |
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end |
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@impl true |
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def handle_call({:upsert, pref}, _from, state) do |
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:ets.insert(@table, {{pref.user_id, pref.channel}, pref}) |
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{:reply, :ok, state} |
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end |
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@impl true |
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def handle_call({:get, user_id, channel}, _from, state) do |
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result = case :ets.lookup(@table, {user_id, channel}) do |
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[{_, p}] -> {:ok, p} |
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[] -> {:error, :not_found} |
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end |
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{:reply, result, state} |
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end |
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@impl true |
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def handle_call({:list_by_user, user_id}, _from, state) do |
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prefs = :ets.tab2list(@table) |
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|> Enum.map(fn {_, p} -> p end) |
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|> Enum.filter(&(&1.user_id == user_id)) |
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{:reply, prefs, state} |
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end |
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@impl true |
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def handle_call(:reset, _from, state) do |
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:ets.delete_all_objects(@table) |
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{:reply, :ok, state} |
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end |
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end |