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defmodule WalletNotifications.NotificationStore do |
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@moduledoc """ |
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ETS-backed GenServer for notification persistence. |
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Tables: |
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- `:wallet_notifications` — notifications keyed by notification_id. |
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- `:wallet_notifications_user_idx` — bag: {user_id, notification_id}. |
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- `:wallet_notifications_idem_idx` — set: {{user_id, idempotency_key}, notification_id}. |
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""" |
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use GenServer |
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alias WalletNotifications.Notification |
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@table :wallet_notifications |
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@user_idx :wallet_notifications_user_idx |
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@idem_idx :wallet_notifications_idem_idx |
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:-( |
def start_link(opts), do: GenServer.start_link(__MODULE__, opts, name: __MODULE__) |
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@spec store(Notification.t()) :: :ok | {:ok, Notification.t()} |
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def store(%Notification{} = n), do: GenServer.call(__MODULE__, {:store, n}) |
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@spec get(String.t()) :: {:ok, Notification.t()} | {:error, :not_found} |
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def get(id), do: GenServer.call(__MODULE__, {:get, id}) |
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@spec update(Notification.t()) :: :ok | {:error, :not_found} |
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def update(%Notification{} = n), do: GenServer.call(__MODULE__, {:update, n}) |
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@spec list_by_user(String.t()) :: [Notification.t()] |
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def list_by_user(user_id), do: GenServer.call(__MODULE__, {:list_by_user, user_id}) |
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@spec list_by_status(atom()) :: [Notification.t()] |
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:-( |
def list_by_status(status), do: GenServer.call(__MODULE__, {:list_by_status, status}) |
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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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:ets.new(@user_idx, [:bag, :protected, :named_table]) |
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:ets.new(@idem_idx, [: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({:store, n}, _from, state) do |
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# Idempotency check |
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result = case n.idempotency_key do |
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nil -> do_store(n); :ok |
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key -> |
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idem_key = {n.user_id, key} |
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case :ets.lookup(@idem_idx, idem_key) do |
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[] -> do_store(n); :ok |
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[{_, existing_id}] -> |
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case :ets.lookup(@table, existing_id) do |
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[{_, existing}] -> {:ok, existing} |
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[] -> do_store(n); :ok |
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end |
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end |
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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({:get, id}, _from, state) do |
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result = case :ets.lookup(@table, id) do |
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[{_, n}] -> {:ok, n} |
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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({:update, n}, _from, state) do |
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result = case :ets.lookup(@table, n.notification_id) do |
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[_] -> :ets.insert(@table, {n.notification_id, n}); :ok |
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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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ids = :ets.lookup(@user_idx, user_id) |> Enum.map(fn {_, id} -> id end) |
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ns = Enum.flat_map(ids, fn id -> |
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case :ets.lookup(@table, id) do |
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[{_, n}] -> [n] |
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[] -> [] |
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end |
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end) |
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{:reply, ns, state} |
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end |
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@impl true |
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def handle_call({:list_by_status, status}, _from, state) do |
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ns = :ets.tab2list(@table) |
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|> Enum.map(fn {_, n} -> n end) |
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|> Enum.filter(&(&1.status == status)) |
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{:reply, ns, 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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:ets.delete_all_objects(@user_idx) |
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:ets.delete_all_objects(@idem_idx) |
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{:reply, :ok, state} |
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end |
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defp do_store(n) do |
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:ets.insert(@table, {n.notification_id, n}) |
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:ets.insert(@user_idx, {n.user_id, n.notification_id}) |
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if n.idempotency_key do |
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:ets.insert(@idem_idx, {{n.user_id, n.idempotency_key}, n.notification_id}) |
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end |
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end |
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end |