nim-codex/codex/purchasing.nim

75 lines
2.2 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 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