57 lines
1.6 KiB
Nim
57 lines
1.6 KiB
Nim
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 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 populate*(purchasing: Purchasing, request: StorageRequest): StorageRequest =
|
|
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)
|
|
|
|
proc purchase*(purchasing: Purchasing, request: StorageRequest): Purchase =
|
|
let request = purchasing.populate(request)
|
|
let purchase = newPurchase(request, purchasing.market, purchasing.clock)
|
|
purchase.start()
|
|
purchasing.purchases[purchase.id] = purchase
|
|
purchase
|
|
|
|
func getPurchase*(purchasing: Purchasing, id: PurchaseId): ?Purchase =
|
|
if purchasing.purchases.hasKey(id):
|
|
some purchasing.purchases[id]
|
|
else:
|
|
none Purchase
|