fix level reporting (#3085)

Oops, level 0 was always used which needlessly increases mem usage -
comes with an assortment of simplifications

execution_chain/db/aristo/aristo_desc.nim

@@ -73,8 +73,7 @@ type
     accLeaves*: Table[Hash32, VertexRef]   ## Account path -> VertexRef
     stoLeaves*: Table[Hash32, VertexRef]   ## Storage path -> VertexRef
 
-    cTop*: VertexID                        ## Last committed vertex ID
-    blockNumber*: Opt[uint64]              ## Block number set when freezing the frame
+    blockNumber*: Opt[uint64]              ## Block number set when checkpointing the frame
 
   AristoDbRef* = ref object
     ## Three tier database object supporting distributed instances.
@@ -202,6 +201,7 @@ iterator rstack*(tx: AristoTxRef): (AristoTxRef, int) =
     let level = if tx.parent == nil: -1 else: i
     yield (tx, level)
     tx = tx.parent
+    i += 1
 
 proc deltaAtLevel*(db: AristoTxRef, level: int): AristoTxRef =
   if level == -2:

execution_chain/db/aristo/aristo_layers.nim

@@ -124,6 +124,7 @@ func isEmpty*(ly: AristoTxRef): bool =
 proc mergeAndReset*(trg, src: AristoTxRef) =
   ## Merges the argument `src` into the argument `trg` and clears `src`.
   trg.vTop = src.vTop
+  trg.blockNumber = src.blockNumber
 
   if trg.kMap.len > 0:
     # Invalidate cached keys in the lower layer

execution_chain/db/aristo/aristo_tx_frame.nim

@@ -73,7 +73,6 @@ proc txFramePersist*(
       if frame == db.txRef:
         continue
       mergeAndReset(db.txRef, frame)
-      db.txRef.blockNumber = frame.blockNumber
 
       frame.dispose() # This will also dispose `txFrame` itself!
 
@@ -82,7 +81,7 @@ proc txFramePersist*(
     db.txRef = txFrame
 
   # Store structural single trie entries
-  for rvid, vtx in db.txRef.sTab:
+  for rvid, vtx in txFrame.sTab:
     txFrame.kMap.withValue(rvid, key) do:
       be.putVtxFn(batch, rvid, vtx, key[])
     do:
@@ -107,6 +106,7 @@ proc txFramePersist*(
   txFrame.kMap.clear()
   txFrame.accLeaves.clear()
   txFrame.stoLeaves.clear()
+  txFrame.blockNumber.reset()
 
 # ------------------------------------------------------------------------------
 # End

execution_chain/db/core_db/core_apps.nim

@@ -221,13 +221,6 @@ proc getScore*(
     warn info, data = data.toHex(), error=exc.msg
     Opt.none(UInt256)
 
-proc setScore*(db: CoreDbTxRef; blockHash: Hash32, score: UInt256) =
-  ## for testing purpose
-  let scoreKey = blockHashToScoreKey blockHash
-  db.put(scoreKey.toOpenArray, rlp.encode(score)).isOkOr:
-    warn "setScore()", scoreKey, error=($$error)
-    return
-
 proc headTotalDifficulty*(
     db: CoreDbTxRef;
       ): UInt256 =

tests/test_aristo/test_tx_frame.nim

@@ -19,11 +19,13 @@ import
     aristo_delete,
     aristo_desc,
     aristo_fetch,
-    aristo_tx_frame,
+    aristo_hike,
     aristo_init,
     aristo_init/memory_db,
+    aristo_layers,
     aristo_merge,
     aristo_persist,
+    aristo_tx_frame,
   ]
 
 proc makeAccount(i: uint64): (Hash32, AristoAccount) =
@@ -34,6 +36,7 @@ proc makeAccount(i: uint64): (Hash32, AristoAccount) =
 const
   acc1 = makeAccount(1)
   acc2 = makeAccount(2)
+  acc3 = makeAccount(3)
 
 suite "Aristo TxFrame":
   setup:
@@ -47,12 +50,14 @@ suite "Aristo TxFrame":
       tx1 = db.txFrameBegin(tx0)
       tx2 = db.txFrameBegin(tx1)
       tx2b = db.txFrameBegin(tx1)
+      tx2c = db.txFrameBegin(tx1)
 
     check:
       tx0.mergeAccountRecord(acc1[0], acc1[1]).isOk()
       tx1.mergeAccountRecord(acc2[0], acc2[1]).isOk()
       tx2.deleteAccountRecord(acc2[0]).isOk()
       tx2b.deleteAccountRecord(acc1[0]).isOk()
+      tx2c.mergeAccountRecord(acc2[0], acc3[1]).isOk()
 
     check:
       tx0.fetchAccountRecord(acc1[0]).isOk()
@@ -68,6 +73,15 @@ suite "Aristo TxFrame":
       tx0.fetchStateRoot() != tx1.fetchStateRoot()
       tx0.fetchStateRoot() == tx2.fetchStateRoot()
 
+    var acc1Hike: Hike
+    check:
+      tx2c.fetchAccountHike(acc1[0], acc1Hike).isOk()
+
+      # The vid for acc1 gets created in tx1 because it has to move to a new
+      # mpt node from the root - tx2c updates only data, so the level at which
+      # we find the vtx should be one below tx2c!
+      tx2c.layersGetVtx((VertexID(1), acc1Hike.legs[^1].wp.vid)).value()[1] == 1
+
     tx2.checkpoint(1)
     let batch = db.backend.putBegFn().expect("working batch")
     db.persist(batch, tx2)