[contracts] Wrap contracts in Market abstraction

dagger/contracts.nim

@@ -2,8 +2,10 @@ import contracts/requests
 import contracts/offers
 import contracts/storage
 import contracts/deployment
+import contracts/market
 
 export requests
 export offers
 export storage
 export deployment
+export market

dagger/contracts/market.nim

@@ -0,0 +1,34 @@
+import pkg/ethers
+import pkg/upraises
+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 =
+  OnChainMarket(contract: contract, signer: !contract.signer)
+
+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)
+
+method requestStorage(market: OnChainMarket, request: StorageRequest) {.async.} =
+  var request = request
+  request.client = await market.signer.getAddress()
+  await market.contract.requestStorage(request)
+
+method unsubscribe*(subscription: OnChainMarketSubscription) {.async.} =
+  await subscription.eventSubscription.unsubscribe()

dagger/contracts/requests.nim

@@ -1,5 +1,7 @@
 import pkg/contractabi
 import pkg/nimcrypto
+import pkg/ethers/fields
+import pkg/questionable/results
 
 export contractabi
 
@@ -14,23 +16,27 @@ type
     expiry*: UInt256
     nonce*: array[32, byte]
 
-func toTuple(request: StorageRequest): auto =
-  (
-    request.client,
-    request.duration,
-    request.size,
-    request.contentHash,
-    request.proofProbability,
-    request.maxPrice,
-    request.expiry,
-    request.nonce
+func fromTuple(_: type StorageRequest, tupl: tuple): StorageRequest =
+  StorageRequest(
+    client: tupl[0],
+    duration: tupl[1],
+    size: tupl[2],
+    contentHash: tupl[3],
+    proofProbability: tupl[4],
+    maxPrice: tupl[5],
+    expiry: tupl[6],
+    nonce: tupl[7]
   )
 
 func solidityType*(_: type StorageRequest): string =
-  solidityType(typeof StorageRequest.default.toTuple)
+  solidityType(StorageRequest.fieldTypes)
 
 func encode*(encoder: var AbiEncoder, request: StorageRequest) =
-  encoder.write(request.toTuple)
+  encoder.write(request.fieldValues)
+
+func decode*(decoder: var AbiDecoder, T: type StorageRequest): ?!T =
+  let tupl = ?decoder.read(StorageRequest.fieldTypes)
+  success StorageRequest.fromTuple(tupl)
 
 func id*(request: StorageRequest): array[32, byte] =
   let encoding = AbiEncoder.encode(request)

dagger/contracts/storage.nim

@@ -11,6 +11,9 @@ export contract
 type
   Storage* = ref object of Contract
   Id = array[32, byte]
+  StorageRequested* = object of Event
+    requestId*: Id
+    request*: StorageRequest
 
 proc collateralAmount*(storage: Storage): UInt256 {.contract, view.}
 proc slashMisses*(storage: Storage): UInt256 {.contract, view.}

dagger/market.nim

@@ -1,4 +1,5 @@
 import pkg/chronos
+import pkg/upraises
 import ./contracts/requests
 import ./contracts/offers
 
@@ -9,8 +10,8 @@ export offers
 type
   Market* = ref object of RootObj
   Subscription* = ref object of RootObj
-  OnRequest* = proc(request: StorageRequest) {.gcsafe.}
-  OnOffer* = proc(offer: StorageOffer) {.gcsafe.}
+  OnRequest* = proc(request: StorageRequest) {.gcsafe, upraises:[].}
+  OnOffer* = proc(offer: StorageOffer) {.gcsafe, upraises:[].}
 
 method requestStorage*(market: Market, request: StorageRequest) {.base, async.} =
   raiseAssert("not implemented")

tests/contracts/testMarket.nim

@@ -0,0 +1,34 @@
+import ./ethertest
+import dagger/contracts
+import dagger/contracts/testtoken
+import ./examples
+
+ethersuite "On-Chain Market":
+
+  var market: OnChainMarket
+  var storage: Storage
+  var token: TestToken
+
+  setup:
+    let deployment = deployment()
+    storage = Storage.new(!deployment.address(Storage), provider.getSigner())
+    token = TestToken.new(!deployment.address(TestToken), provider.getSigner())
+    await token.mint(accounts[0], 1000.u256)
+    market = OnChainMarket.new(storage)
+
+  test "supports storage requests":
+    var submitted: seq[StorageRequest]
+    proc onRequest(request: StorageRequest) =
+      submitted.add(request)
+    let subscription = await market.subscribeRequests(onRequest)
+    let request = StorageRequest(
+      duration: uint16.example.u256,
+      size: uint32.example.u256,
+      contentHash: array[32, byte].example
+    )
+    await market.requestStorage(request)
+    check submitted.len == 1
+    check submitted[0].duration == request.duration
+    check submitted[0].size == request.size
+    check submitted[0].contentHash == request.contentHash
+    await subscription.unsubscribe()

tests/testContracts.nim

@@ -1,4 +1,5 @@
 import ./contracts/testCollateral
 import ./contracts/testContracts
+import ./contracts/testMarket
 
 {.warning[UnusedImport]:off.}