[marketplace] support freeing of slots and failed state

Support storage contract parameters to free slots after too many proofs missed, as well as fail a contract after too many slots have been freed.

# Conflicts:
#	vendor/dagger-contracts

codex/contracts/market.nim

@@ -36,10 +36,14 @@ method requestStorage(market: OnChainMarket,
 
 method getRequest(market: OnChainMarket,
                   id: RequestId): Future[?StorageRequest] {.async.} =
-  let request = await market.contract.getRequest(id)
-  if request != StorageRequest.default:
-    return some request
-  else:
+  try:
+    let request = await market.contract.getRequest(id)
+    if request != StorageRequest.default:
+      return some request
+    else:
+      return none StorageRequest
+  except ValueError:
+    # Unknown request
     return none StorageRequest
 
 method getHost(market: OnChainMarket,

codex/contracts/requests.nim

@@ -19,6 +19,7 @@ type
     duration*: UInt256
     proofProbability*: UInt256
     reward*: UInt256
+    maxSlotLoss*: uint64
   StorageContent* = object
     cid*: string
     erasure*: StorageErasure
@@ -56,7 +57,8 @@ func fromTuple(_: type StorageAsk, tupl: tuple): StorageAsk =
     slotSize: tupl[1],
     duration: tupl[2],
     proofProbability: tupl[3],
-    reward: tupl[4]
+    reward: tupl[4],
+    maxSlotLoss: tupl[5]
   )
 
 func fromTuple(_: type StorageContent, tupl: tuple): StorageContent =

codex/contracts/storage.nim

@@ -15,7 +15,7 @@ type
   SlotFilled* = object of Event
     requestId* {.indexed.}: RequestId
     slotIndex* {.indexed.}: UInt256
-    slotId* {.indexed.}: SlotId
+    slotId*: SlotId
   RequestFulfilled* = object of Event
     requestId* {.indexed.}: RequestId
   RequestCancelled* = object of Event
@@ -28,6 +28,7 @@ type
 proc collateralAmount*(storage: Storage): UInt256 {.contract, view.}
 proc slashMisses*(storage: Storage): UInt256 {.contract, view.}
 proc slashPercentage*(storage: Storage): UInt256 {.contract, view.}
+proc minCollateralThreshold*(storage: Storage): UInt256 {.contract, view.}
 
 proc deposit*(storage: Storage, amount: UInt256) {.contract.}
 proc withdraw*(storage: Storage) {.contract.}

codex/node.nim

@@ -270,7 +270,8 @@ proc requestStorage*(self: CodexNodeRef,
       slots: nodes + tolerance,
       slotSize: (encoded.blockSize * encoded.steps).u256,
       duration: duration,
-      reward: reward
+      reward: reward,
+      maxSlotLoss: tolerance
     ),
     content: StorageContent(
       cid: $encodedBlk.cid,

tests/contracts/examples.nim

@@ -17,7 +17,8 @@ proc example*(_: type StorageRequest): StorageRequest =
       slotSize: (1 * 1024 * 1024 * 1024).u256, # 1 Gigabyte
       duration: (10 * 60 * 60).u256, # 10 hours
       proofProbability: 4.u256, # require a proof roughly once every 4 periods
-      reward: 84.u256
+      reward: 84.u256,
+      maxSlotLoss: 2 # 2 slots can be freed without data considered to be lost
     ),
     content: StorageContent(
       cid: "zb2rhheVmk3bLks5MgzTqyznLu1zqGH5jrfTA1eAZXrjx7Vob",

tests/contracts/testMarket.nim

@@ -135,7 +135,7 @@ ethersuite "On-Chain Market":
 
     await token.approve(storage.address, request.price)
     discard await market.requestStorage(request)
-    await token.approve(storage.address, otherrequest.price)
+    await token.approve(storage.address, otherRequest.price)
     discard await market.requestStorage(otherRequest)
 
     var receivedIds: seq[RequestId]

vendor/dagger-contracts

@@ -1 +1 @@
-Subproject commit 06e58fdc4923999cb93e54b55a5e68da26435628
+Subproject commit c27d4f870c99f8657027ec9b1ab24223adba9859