[sales] Make storage available again when offer declined

dagger/sales.nim

@@ -73,8 +73,11 @@ proc handleRequest(sales: Sales, request: StorageRequest) {.async.} =
   proc onSelect(offerId: array[32, byte]) {.gcsafe, upraises:[].} =
     if subscription =? subscription:
       asyncSpawn subscription.unsubscribe()
-    if onSale =? sales.onSale and offer.id == offerId:
-      onSale(offer)
+    if offer.id == offerId:
+      if onSale =? sales.onSale:
+        onSale(offer)
+    else:
+      sales.add(availability)
   subscription = some await sales.market.subscribeSelection(request.id, onSelect)
 
 proc start*(sales: Sales) =

tests/dagger/testsales.nim

@@ -87,3 +87,11 @@ suite "Sales":
     otherOffer = await market.offerStorage(otherOffer)
     await market.selectOffer(otherOffer.id)
     check not didSell
+
+  test "makes storage available again when different offer is selected":
+    sales.add(availability)
+    let request = await market.requestStorage(request)
+    var otherOffer = StorageOffer(requestId: request.id, price: 1.u256)
+    otherOffer = await market.offerStorage(otherOffer)
+    await market.selectOffer(otherOffer.id)
+    check sales.available.contains(availability)