nim-codex/codex/purchasing/states/cancelled.nim

import ../statemachine
import ./error

type PurchaseCancelled* = ref object of PurchaseState

method enterAsync*(state: PurchaseCancelled) {.async.} =
  without purchase =? (state.context as Purchase):
    raiseAssert "invalid state"

  try:
    await purchase.market.withdrawFunds(purchase.requestId)
  except CatchableError as error:
    state.switch(PurchaseErrored(error: error))
    return

  let error = newException(Timeout, "Purchase cancelled due to timeout")
  state.switch(PurchaseErrored(error: error))

method description*(state: PurchaseCancelled): string =
  "cancelled"