feat(slot-reservations): Support reserving slots (#907)

* feat(slot-reservations): Support reserving slots

Closes #898.

Wire up reserveSlot and canReserveSlot contract calls, but don't call them

* Remove return value from `reserveSlot`

* convert EthersError to MarketError

* Move convertEthersError to reserveSlot

* bump codex-contracts-eth after rebase

* change `canReserveSlot` and `reserveSlot` parameters

Parameters for `canReserveSlot` and `reserveSlot` were changed from `SlotId` to `RequestId` and `UInt256 slotIndex`.

* bump codex-contracts-eth after rebase

* bump codex-contracts-eth to master after codex-contracts-eth/pull/177 merged

Author: emizzle

codex/contracts/market.nim

@@ -247,6 +247,21 @@ method canProofBeMarkedAsMissing*(
     trace "Proof cannot be marked as missing", msg = e.msg
     return false
 
+method reserveSlot*(
+  market: OnChainMarket,
+  requestId: RequestId,
+  slotIndex: UInt256) {.async.} =
+
+  convertEthersError:
+    discard await market.contract.reserveSlot(requestId, slotIndex).confirm(0)
+
+method canReserveSlot*(
+  market: OnChainMarket,
+  requestId: RequestId,
+  slotIndex: UInt256): Future[bool] {.async.} =
+
+  await market.contract.canReserveSlot(requestId, slotIndex)
+
 method subscribeRequests*(market: OnChainMarket,
                          callback: OnRequest):
                         Future[MarketSubscription] {.async.} =

codex/contracts/marketplace.nim

@@ -51,3 +51,6 @@ proc getPointer*(marketplace: Marketplace, id: SlotId): uint8 {.contract, view.}
 
 proc submitProof*(marketplace: Marketplace, id: SlotId, proof: Groth16Proof): ?TransactionResponse {.contract.}
 proc markProofAsMissing*(marketplace: Marketplace, id: SlotId, period: UInt256): ?TransactionResponse {.contract.}
+
+proc reserveSlot*(marketplace: Marketplace, requestId: RequestId, slotIndex: UInt256): ?TransactionResponse {.contract.}
+proc canReserveSlot*(marketplace: Marketplace, requestId: RequestId, slotIndex: UInt256): bool {.contract, view.}

codex/market.nim

@@ -161,6 +161,20 @@ method canProofBeMarkedAsMissing*(market: Market,
                                   period: Period): Future[bool] {.base, async.} =
   raiseAssert("not implemented")
 
+method reserveSlot*(
+  market: Market,
+  requestId: RequestId,
+  slotIndex: UInt256) {.base, async.} =
+
+  raiseAssert("not implemented")
+
+method canReserveSlot*(
+  market: Market,
+  requestId: RequestId,
+  slotIndex: UInt256): Future[bool] {.base, async.} =
+
+  raiseAssert("not implemented")
+
 method subscribeFulfillment*(market: Market,
                              callback: OnFulfillment):
                             Future[Subscription] {.base, async.} =