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