[market] Add market.getHost()

codex/contracts/market.nim

@@ -39,6 +39,14 @@ method getRequest(market: OnChainMarket,
   else:
     return none StorageRequest
 
+method getHost(market: OnChainMarket,
+               id: array[32, byte]): Future[?Address] {.async.} =
+  let address = await market.contract.getHost(id)
+  if address != Address.default:
+    return some address
+  else:
+    return none Address
+
 method fulfillRequest(market: OnChainMarket,
                       requestId: array[32, byte],
                       proof: seq[byte]) {.async.} =

codex/contracts/storage.nim

@@ -31,6 +31,7 @@ proc balanceOf*(storage: Storage, account: Address): UInt256 {.contract, view.}
 proc requestStorage*(storage: Storage, request: StorageRequest) {.contract.}
 proc fulfillRequest*(storage: Storage, id: Id, proof: seq[byte]) {.contract.}
 proc getRequest*(storage: Storage, id: Id): StorageRequest {.contract, view.}
+proc getHost*(storage: Storage, id: Id): Address {.contract, view.}
 
 proc finishContract*(storage: Storage, id: Id) {.contract.}
 

codex/market.nim

@@ -25,6 +25,10 @@ method getRequest*(market: Market,
                   Future[?StorageRequest] {.base, async.} =
   raiseAssert("not implemented")
 
+method getHost*(market: Market,
+                requestId: array[32, byte]): Future[?Address] {.base, async.} =
+  raiseAssert("not implemented")
+
 method fulfillRequest*(market: Market,
                        requestId: array[32, byte],
                        proof: seq[byte]) {.base, async.} =

tests/codex/helpers/mockmarket.nim

@@ -11,6 +11,7 @@ type
   Fulfillment* = object
     requestId: array[32, byte]
     proof: seq[byte]
+    host: Address
   Subscriptions = object
     onRequest: seq[RequestSubscription]
     onFulfillment: seq[FulfillmentSubscription]
@@ -37,14 +38,28 @@ method getRequest(market: MockMarket,
       return some request
   return none StorageRequest
 
-method fulfillRequest*(market: MockMarket,
+method getHost(market: MockMarket,
+               id: array[32, byte]): Future[?Address] {.async.} =
+  for fulfillment in market.fulfilled:
+    if fulfillment.requestId == id:
+      return some fulfillment.host
+  return none Address
+
+proc fulfillRequest*(market: MockMarket,
                      requestId: array[32, byte],
-                       proof: seq[byte]) {.async.} =
-  market.fulfilled.add(Fulfillment(requestId: requestId, proof: proof))
+                     proof: seq[byte],
+                     host: Address) =
+  let fulfillment = Fulfillment(requestId: requestId, proof: proof, host: host)
+  market.fulfilled.add(fulfillment)
   for subscription in market.subscriptions.onFulfillment:
     if subscription.requestId == requestId:
       subscription.callback(requestId)
 
+method fulfillRequest*(market: MockMarket,
+                       requestId: array[32, byte],
+                       proof: seq[byte]) {.async.} =
+  market.fulfillRequest(requestid, proof, Address.default)
+
 method subscribeRequests*(market: MockMarket,
                           callback: OnRequest):
                          Future[Subscription] {.async.} =

tests/contracts/testMarket.nim

@@ -73,6 +73,13 @@ ethersuite "On-Chain Market":
     discard await market.requestStorage(request)
     await market.fulfillRequest(request.id, proof)
 
+  test "can retrieve host that fulfilled request":
+    await token.approve(storage.address, request.ask.maxPrice)
+    discard await market.requestStorage(request)
+    check (await market.getHost(request.id)) == none Address
+    await market.fulfillRequest(request.id, proof)
+    check (await market.getHost(request.id)) == some accounts[0]
+
   test "support fulfillment subscriptions":
     await token.approve(storage.address, request.ask.maxPrice)
     discard await market.requestStorage(request)