Fix logging

Author: jangko

execution_chain/core/chain/forked_chain/chain_branch.nim

@@ -76,6 +76,3 @@ iterator everyNthBlock*(base: BlockRef, step: uint64): BlockRef =
 
   for i in countdown(steps.len-1, 0):
     yield steps[i]
-
-func `$`*(b: BlockRef): string =
-  $(b.number)

execution_chain/core/chain/forked_chain/chain_serialize.nim

@@ -185,6 +185,14 @@ proc reset(fc: ForkedChainRef, base: BlockRef) =
   fc.fcuHead.reset()
   fc.fcuSafe.reset()
 
+func toString(list: openArray[BlockRef]): string =
+  result.add '['
+  for i, b in list:
+    result.add $(b.number)
+    if i < list.len-1:
+      result.add ','
+  result.add ']'
+
 # ------------------------------------------------------------------------------
 # Public functions
 # ------------------------------------------------------------------------------
@@ -210,7 +218,7 @@ proc serialize*(fc: ForkedChainRef, txFrame: CoreDbTxRef): Result[void, CoreDbEr
     finalized=fc.latestFinalizedBlockNumber,
     finalizedHash=fc.pendingFCU.short,
     blocksInMemory=fc.hashToBlock.len,
-    heads=fc.heads
+    heads=fc.heads.toString
 
   ok()
 
@@ -250,7 +258,7 @@ proc deserialize*(fc: ForkedChainRef): Result[void, string] =
     canonicalHead=fc.fcuHead.number,
     safe=fc.fcuSafe.number,
     numBlocks=state.numBlocks,
-    heads=fc.heads
+    heads=fc.heads.toString
 
   if state.numBlocks > 64:
     info "Please wait until DAG finish loading..."