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defmodule WalletTransfers.Commands.CancelTransfer do |
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@moduledoc """ |
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Command handler for canceling an initiated transfer. |
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Acquires a per-transfer lock, retrieves the transfer, applies the cancel |
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state transition with a reason, persists the updated transfer, releases |
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the lock, and emits domain and audit events. |
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""" |
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alias WalletTransfers.{Transfer, TransferStore, LockStore} |
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alias WalletTransfers.Events.TransferCanceled |
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alias WalletObservability.AuditEvent |
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@doc """ |
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Executes the cancel transfer command. |
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Options: |
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- `correlation_id` — propagated into events. |
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Returns `{:ok, transfer}` or `{:error, :locked | :not_found | :invalid_transition}`. |
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""" |
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@spec execute(transfer_id :: String.t(), reason :: String.t(), opts :: keyword()) :: |
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{:ok, Transfer.t()} | {:error, :locked | :not_found | :invalid_transition} |
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def execute(transfer_id, reason, opts \\ []) do |
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correlation_id = |
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Keyword.get(opts, :correlation_id, WalletSharedKernel.Correlation.new_correlation_id()) |
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|
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case LockStore.acquire(transfer_id) do |
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:-( |
{:error, :locked} -> |
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{:error, :locked} |
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:ok -> |
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result = |
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with {:ok, transfer} <- TransferStore.get(transfer_id), |
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{:ok, canceled_transfer} <- Transfer.cancel(transfer, reason), |
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:ok <- TransferStore.update(canceled_transfer) do |
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{:ok, canceled_transfer} |
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end |
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LockStore.release(transfer_id) |
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case result do |
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{:ok, canceled_transfer} -> |
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emit_event( |
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TransferCanceled.build(transfer_id, canceled_transfer.user_id, |
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correlation_id: correlation_id, |
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amount: canceled_transfer.amount, |
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currency: canceled_transfer.currency, |
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reason: reason, |
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canceled_at: canceled_transfer.canceled_at |
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) |
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) |
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audit = |
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AuditEvent.build( |
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:financial, |
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"transfer_canceled", |
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"transfer", |
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transfer_id, |
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:success, |
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actor_id: canceled_transfer.user_id, |
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correlation_id: correlation_id, |
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metadata: %{ |
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reason: reason, |
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amount: canceled_transfer.amount, |
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currency: canceled_transfer.currency |
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} |
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) |
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:telemetry.execute([:wallet_transfers, :audit], %{}, audit) |
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{:ok, canceled_transfer} |
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error -> |
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error |
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end |
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end |
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end |
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defp emit_event(event) do |
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pubsub = Application.get_env(:wallet_transfers, :pubsub, WalletWeb.PubSub) |
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apply(Phoenix.PubSub, :broadcast, [ |
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pubsub, |
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"wallet_transfers:events", |
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{:domain_event, event} |
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]) |
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rescue |
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:-( |
_ -> :ok |
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end |
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end |