From 40752b1e89480187ba3571ab8c102b5982fb5c69 Mon Sep 17 00:00:00 2001
From: Aaryamann Challani <43716372+rymnc@users.noreply.github.com>
Date: Wed, 24 Apr 2024 17:11:32 +0200
Subject: [PATCH] chore(rln-db-inspector): add more logging to find zero leaf
 indices (#2617)

* chore(rln-db-inspector): add more logging to find zero leaf indices

* fix: assumeEmptyAfter var
---
 tools/rln_db_inspector/rln_db_inspector.nim | 25 +++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/rln_db_inspector/rln_db_inspector.nim b/tools/rln_db_inspector/rln_db_inspector.nim
index eed618df5..0820e255f 100644
--- a/tools/rln_db_inspector/rln_db_inspector.nim
+++ b/tools/rln_db_inspector/rln_db_inspector.nim
@@ -38,4 +38,29 @@ proc doInspectRlnDb*(conf: WakuNodeConf) =
     contractAddress = metadata.contractAddress,
     validRoots = metadata.validRoots.mapIt(it.inHex())
 
+  var index: uint = 0
+  var hits: uint = 0
+  var zeroLeafIndices: seq[uint] = @[]
+  var assumeEmptyAfter: uint = 10
+  while true:
+    let leaf = rlnInstance.getMember(index).valueOr:
+      error "failure while getting RLN leaf", error
+      quit(1)
+
+    if leaf.inHex() == "0000000000000000000000000000000000000000000000000000000000000000":
+      zeroLeafIndices.add(index)
+      hits = hits + 1
+    else:
+      hits = 0
+
+    if hits > assumeEmptyAfter:
+      info "reached end of RLN tree", index = index - assumeEmptyAfter
+      # remove zeroLeafIndices that are not at the end of the tree
+      zeroLeafIndices = zeroLeafIndices.filterIt(it < index - assumeEmptyAfter)
+      break
+
+    index = index + 1
+
+  info "zero leaf indices", zeroLeafIndices
+
   quit(0)