import std/tables import pkg/stint import pkg/chronos import pkg/questionable import pkg/nimcrypto import ./market import ./clock import ./purchasing/purchase export questionable export chronos export market export purchase type Purchasing* = ref object market: Market clock: Clock purchases: Table[PurchaseId, Purchase] proofProbability*: UInt256 requestExpiryInterval*: UInt256 PurchaseTimeout* = Timeout const DefaultProofProbability = 100.u256 const DefaultRequestExpiryInterval = (10 * 60).u256 proc new*(_: type Purchasing, market: Market, clock: Clock): Purchasing = Purchasing( market: market, clock: clock, proofProbability: DefaultProofProbability, requestExpiryInterval: DefaultRequestExpiryInterval, ) proc load*(purchasing: Purchasing) {.async.} = let market = purchasing.market let requestIds = await market.myRequests() for requestId in requestIds: let purchase = Purchase.new(requestId, purchasing.market, purchasing.clock) purchase.load() purchasing.purchases[purchase.id] = purchase proc start*(purchasing: Purchasing) {.async.} = await purchasing.load() proc stop*(purchasing: Purchasing) {.async.} = discard proc populate*(purchasing: Purchasing, request: StorageRequest ): Future[StorageRequest] {.async.} = result = request if result.ask.proofProbability == 0.u256: result.ask.proofProbability = purchasing.proofProbability if result.expiry == 0.u256: result.expiry = (purchasing.clock.now().u256 + purchasing.requestExpiryInterval) if result.nonce == Nonce.default: var id = result.nonce.toArray doAssert randomBytes(id) == 32 result.nonce = Nonce(id) result.client = await purchasing.market.getSigner() proc purchase*(purchasing: Purchasing, request: StorageRequest ): Future[Purchase] {.async.} = let request = await purchasing.populate(request) let purchase = Purchase.new(request, purchasing.market, purchasing.clock) purchase.start() purchasing.purchases[purchase.id] = purchase return purchase func getPurchase*(purchasing: Purchasing, id: PurchaseId): ?Purchase = if purchasing.purchases.hasKey(id): some purchasing.purchases[id] else: none Purchase func getPurchaseIds*(purchasing: Purchasing): seq[PurchaseId] = var pIds: seq[PurchaseId] = @[] for key in purchasing.purchases.keys: pIds.add(key) return pIds