nim-codex/dagger/contracts/market.nim

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import pkg/ethers
import pkg/upraises
import pkg/questionable
import ../market
import ./storage
type
OnChainMarket* = ref object of Market
contract: Storage
signer: Signer
MarketSubscription = market.Subscription
EventSubscription = ethers.Subscription
OnChainMarketSubscription = ref object of MarketSubscription
eventSubscription: EventSubscription
export market
func new*(_: type OnChainMarket, contract: Storage): OnChainMarket =
without signer =? contract.signer:
raiseAssert("Storage contract should have a signer")
OnChainMarket(contract: contract, signer: signer)
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method requestStorage(market: OnChainMarket, request: StorageRequest) {.async.} =
var request = request
request.client = await market.signer.getAddress()
await market.contract.requestStorage(request)
method offerStorage(market: OnChainMarket, offer: StorageOffer) {.async.} =
var offer = offer
offer.host = await market.signer.getAddress()
await market.contract.offerStorage(offer)
method subscribeRequests(market: OnChainMarket,
callback: OnRequest):
Future[MarketSubscription] {.async.} =
proc onEvent(event: StorageRequested) {.upraises:[].} =
callback(event.request)
let subscription = await market.contract.subscribe(StorageRequested, onEvent)
return OnChainMarketSubscription(eventSubscription: subscription)
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method subscribeOffers(market: OnChainMarket,
requestId: array[32, byte],
callback: OnOffer):
Future[MarketSubscription] {.async.} =
proc onEvent(event: StorageOffered) {.upraises:[].} =
if event.requestId == requestId:
callback(event.offer)
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let subscription = await market.contract.subscribe(StorageOffered, onEvent)
return OnChainMarketSubscription(eventSubscription: subscription)
method unsubscribe*(subscription: OnChainMarketSubscription) {.async.} =
await subscription.eventSubscription.unsubscribe()