Add the epoch to the HistoricalSummariesKey (#2179)

fluffy/network/beacon/beacon_content.nim

@@ -60,7 +60,8 @@ type
   LightClientOptimisticUpdateKey* = object
     optimisticSlot*: uint64 ## signature_slot of the update
 
-  HistoricalSummariesKey* = uint8
+  HistoricalSummariesKey* = object
+    epoch*: uint64
 
   ContentKey* = object
     case contentType*: ContentType
@@ -252,5 +253,8 @@ func optimisticUpdateContentKey*(optimisticSlot: uint64): ContentKey =
       LightClientOptimisticUpdateKey(optimisticSlot: optimisticSlot),
   )
 
-func historicalSummariesContentKey*(): ContentKey =
+func historicalSummariesContentKey*(epoch: uint64): ContentKey =
-  ContentKey(contentType: historicalSummaries, historicalSummariesKey: 0)
+  ContentKey(
+    contentType: historicalSummaries,
+    historicalSummariesKey: HistoricalSummariesKey(epoch: epoch),
+  )

fluffy/network/beacon/beacon_network.nim

@@ -160,11 +160,11 @@ proc getLightClientOptimisticUpdate*(
     return Opt.some(decodingResult.value())
 
 proc getHistoricalSummaries*(
-    n: BeaconNetwork
+    n: BeaconNetwork, epoch: uint64
 ): Future[results.Opt[HistoricalSummaries]] {.async.} =
   # Note: when taken from the db, it does not need to verify the proof.
   let
-    contentKey = historicalSummariesContentKey()
+    contentKey = historicalSummariesContentKey(epoch)
     content = ?await n.getContent(contentKey)
 
     summariesWithProof = decodeSsz(content, HistoricalSummariesWithProof).valueOr:

fluffy/tests/beacon_network_tests/test_beacon_network.nim

@@ -238,13 +238,13 @@ procSuite "Beacon Content Network":
       (await lcNode2.portalProtocol().ping(lcNode1.localNode())).isOk()
 
     let
-      contentKeyEncoded = historicalSummariesContentKey().encode()
+      contentKeyEncoded = historicalSummariesContentKey(0).encode()
       contentId = toContentId(contentKeyEncoded)
 
     lcNode2.portalProtocol().storeContent(contentKeyEncoded, contentId, content)
 
     block:
-      let res = await lcNode1.beaconNetwork.getHistoricalSummaries()
+      let res = await lcNode1.beaconNetwork.getHistoricalSummaries(0)
       # Should fail as it cannot validate
       check res.isErr()
 
@@ -269,7 +269,7 @@ procSuite "Beacon Content Network":
       lcNode1.portalProtocol().storeContent(contentKeyEncoded, contentId, content)
 
     block:
-      let res = await lcNode1.beaconNetwork.getHistoricalSummaries()
+      let res = await lcNode1.beaconNetwork.getHistoricalSummaries(0)
       check:
         res.isOk()
         withState(state[]):