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defmodule WalletRisk.RiskSignalStore do |
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@moduledoc """ |
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ETS-backed GenServer for RiskSignal persistence. |
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Tables: |
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- `:wallet_risk_signals` — keyed by signal_id. |
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- `:wallet_risk_signal_user_idx` — bag: {user_id, signal_id}. |
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""" |
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use GenServer |
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alias WalletRisk.RiskSignal |
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@table :wallet_risk_signals |
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@user_idx :wallet_risk_signal_user_idx |
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def start_link(opts), do: GenServer.start_link(__MODULE__, opts, name: __MODULE__) |
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@spec store(RiskSignal.t()) :: :ok | {:error, :duplicate_signal_id} |
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def store(%RiskSignal{} = s), do: GenServer.call(__MODULE__, {:store, s}) |
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@spec get(signal_id :: String.t()) :: {:ok, RiskSignal.t()} | {:error, :not_found} |
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def get(id), do: GenServer.call(__MODULE__, {:get, id}) |
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@spec list_by_user(user_id :: String.t()) :: [RiskSignal.t()] |
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def list_by_user(uid), do: GenServer.call(__MODULE__, {:list_by_user, uid}) |
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@spec list_all() :: [RiskSignal.t()] |
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def list_all, do: GenServer.call(__MODULE__, :list_all) |
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@spec reset() :: :ok |
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def reset, do: GenServer.call(__MODULE__, :reset) |
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@impl true |
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def init(_opts) 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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{:ok, %{}} |
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end |
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@impl true |
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def handle_call({:store, s}, _from, state) do |
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if :ets.member(@table, s.signal_id) do |
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{:reply, {:error, :duplicate_signal_id}, state} |
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else |
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:ets.insert(@table, {s.signal_id, s}) |
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:ets.insert(@user_idx, {s.user_id, s.signal_id}) |
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{:reply, :ok, state} |
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end |
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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 = |
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case :ets.lookup(@table, id) do |
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[{_, s}] -> {:ok, s} |
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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, uid}, _from, state) do |
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ids = :ets.lookup(@user_idx, uid) |> Enum.map(fn {_, id} -> id end) |
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items = |
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Enum.flat_map(ids, fn id -> |
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case :ets.lookup(@table, id) do |
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[{_, s}] -> [s] |
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[] -> [] |
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end |
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end) |
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{:reply, items, state} |
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end |
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@impl true |
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def handle_call(:list_all, _from, state) do |
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items = :ets.tab2list(@table) |> Enum.map(fn {_, s} -> s end) |
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{:reply, items, 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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{:reply, :ok, state} |
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end |
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end |