[sales] Introduce Negotiation object
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@ -22,6 +22,13 @@ type
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size*: uint64
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duration*: uint64
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minPrice*: UInt256
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Negotiation = ref object
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sales: Sales
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request: StorageRequest
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availability: Availability
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offer: ?StorageOffer
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subscription: ?Subscription
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waiting: ?Future[void]
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OnSale = proc(offer: StorageOffer) {.gcsafe, upraises: [].}
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func new*(_: type Sales, market: Market): Sales =
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@ -51,34 +58,61 @@ func findAvailability(sales: Sales, request: StorageRequest): ?Availability =
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request.maxPrice >= availability.minPrice:
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return some availability
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proc createOffer(sales: Sales,
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request: StorageRequest,
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availability: Availability): StorageOffer =
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proc createOffer(negotiation: Negotiation): StorageOffer =
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StorageOffer(
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requestId: request.id,
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price: request.maxPrice,
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expiry: getTime().toUnix().u256 + sales.offerExpiryInterval
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requestId: negotiation.request.id,
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price: negotiation.request.maxPrice,
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expiry: getTime().toUnix().u256 + negotiation.sales.offerExpiryInterval
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)
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proc sendOffer(negotiation: Negotiation) {.async.} =
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let offer = negotiation.createOffer()
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negotiation.offer = some await negotiation.sales.market.offerStorage(offer)
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proc onSelect(negotiation: Negotiation, offerId: array[32, byte]) =
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if subscription =? negotiation.subscription:
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asyncSpawn subscription.unsubscribe()
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without offer =? negotiation.offer:
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return
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if offer.id == offerId:
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if onSale =? negotiation.sales.onSale:
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onSale(offer)
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else:
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negotiation.sales.add(negotiation.availability)
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proc subscribeSelect(negotiation: Negotiation) {.async.} =
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without offer =? negotiation.offer:
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return
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proc onSelect(offerId: array[32, byte]) {.gcsafe, upraises:[].} =
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negotiation.onSelect(offerId)
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let market = negotiation.sales.market
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let subscription = await market.subscribeSelection(offer.requestId, onSelect)
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negotiation.subscription = some subscription
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proc waitForExpiry(negotiation: Negotiation) {.async.} =
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without offer =? negotiation.offer:
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return
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await negotiation.sales.market.waitUntil(offer.expiry)
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proc start(negotiation: Negotiation) {.async.} =
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let sales = negotiation.sales
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let availability = negotiation.availability
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sales.remove(availability)
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await negotiation.sendOffer()
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await negotiation.subscribeSelect()
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await negotiation.waitForExpiry()
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proc handleRequest(sales: Sales, request: StorageRequest) {.async.} =
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without availability =? sales.findAvailability(request):
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return
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sales.remove(availability)
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let negotiation = Negotiation(
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sales: sales,
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request: request,
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availability: availability
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)
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var offer = sales.createOffer(request, availability)
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offer = await sales.market.offerStorage(offer)
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var subscription: ?Subscription
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proc onSelect(offerId: array[32, byte]) {.gcsafe, upraises:[].} =
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if subscription =? subscription:
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asyncSpawn subscription.unsubscribe()
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if offer.id == offerId:
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if onSale =? sales.onSale:
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onSale(offer)
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else:
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sales.add(availability)
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subscription = some await sales.market.subscribeSelection(request.id, onSelect)
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asyncSpawn negotiation.start()
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proc start*(sales: Sales) =
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doAssert sales.subscription.isNone, "Sales already started"
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