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defmodule WalletSettlement.SettlementStore do |
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@moduledoc """ |
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ETS-backed GenServer for settlement batch persistence. |
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Tables: |
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- `:wallet_settlement_batches` — batches keyed by batch_id. |
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- `:wallet_settlement_batch_idx` — bag index: {status, batch_id}. |
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""" |
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use GenServer |
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alias WalletSettlement.SettlementBatch |
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@batches_table :wallet_settlement_batches |
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@idx_table :wallet_settlement_batch_idx |
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def start_link(opts), do: GenServer.start_link(__MODULE__, opts, name: __MODULE__) |
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@doc "Stores a new batch. Returns `:ok` or `{:error, :duplicate_batch_id}`." |
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@spec store(SettlementBatch.t()) :: :ok | {:error, :duplicate_batch_id} |
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def store(%SettlementBatch{} = batch), do: GenServer.call(__MODULE__, {:store, batch}) |
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@doc "Retrieves a batch by batch_id." |
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@spec get(String.t()) :: {:ok, SettlementBatch.t()} | {:error, :not_found} |
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def get(batch_id), do: GenServer.call(__MODULE__, {:get, batch_id}) |
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@doc "Updates an existing batch." |
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@spec update(SettlementBatch.t()) :: :ok | {:error, :not_found} |
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def update(%SettlementBatch{} = batch), do: GenServer.call(__MODULE__, {:update, batch}) |
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@doc "Lists all batches with a given status." |
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@spec list_by_status(atom()) :: [SettlementBatch.t()] |
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def list_by_status(status), do: GenServer.call(__MODULE__, {:list_by_status, status}) |
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@doc "Lists all batches." |
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@spec list_all() :: [SettlementBatch.t()] |
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def list_all, do: GenServer.call(__MODULE__, :list_all) |
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@doc "Resets all store state. Test use only." |
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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(@batches_table, [:set, :protected, :named_table]) |
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:ets.new(@idx_table, [: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, batch}, _from, state) do |
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if :ets.member(@batches_table, batch.batch_id) do |
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{:reply, {:error, :duplicate_batch_id}, state} |
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else |
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:ets.insert(@batches_table, {batch.batch_id, batch}) |
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:ets.insert(@idx_table, {batch.status, batch.batch_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, batch_id}, _from, state) do |
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result = case :ets.lookup(@batches_table, batch_id) do |
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[{_, batch}] -> {:ok, batch} |
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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, batch}, _from, state) do |
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result = case :ets.lookup(@batches_table, batch.batch_id) do |
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[{_, old}] -> |
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:ets.delete_object(@idx_table, {old.status, old.batch_id}) |
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:ets.insert(@batches_table, {batch.batch_id, batch}) |
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:ets.insert(@idx_table, {batch.status, batch.batch_id}) |
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: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_status, status}, _from, state) do |
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ids = :ets.lookup(@idx_table, status) |> Enum.map(fn {_, id} -> id end) |
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batches = Enum.flat_map(ids, fn id -> |
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case :ets.lookup(@batches_table, id) do |
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[{_, b}] -> [b] |
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[] -> [] |
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end |
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end) |
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{:reply, batches, 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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batches = :ets.tab2list(@batches_table) |> Enum.map(fn {_, b} -> b end) |
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{:reply, batches, 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(@batches_table) |
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:ets.delete_all_objects(@idx_table) |
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{:reply, :ok, state} |
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end |
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end |