From 4e65ceb9d0c3597ac6af47951b8d0fe8c37d0f28 Mon Sep 17 00:00:00 2001
From: Matthew Slipper <me@matthewslipper.com>
Date: Wed, 2 Nov 2022 11:54:41 -0600
Subject: [PATCH] l2geth: Dedupe dumper addresses in memory (#3852)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
---
 .changeset/kind-ravens-shake.md |  5 +++++
 l2geth/statedumper/dumper.go    | 13 ++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/kind-ravens-shake.md

diff --git a/.changeset/kind-ravens-shake.md b/.changeset/kind-ravens-shake.md
new file mode 100644
index 000000000000..705172ebd3e8
--- /dev/null
+++ b/.changeset/kind-ravens-shake.md
@@ -0,0 +1,5 @@
+---
+'@eth-optimism/l2geth': patch
+---
+
+Dedupe dumper addresses in memory
diff --git a/l2geth/statedumper/dumper.go b/l2geth/statedumper/dumper.go
index 0df9611897ee..bf3c1b567ad6 100644
--- a/l2geth/statedumper/dumper.go
+++ b/l2geth/statedumper/dumper.go
@@ -28,18 +28,25 @@ func NewStateDumper() StateDumper {
 	}
 
 	return &FileStateDumper{
-		f: f,
+		f:        f,
+		ethCache: make(map[common.Address]bool),
 	}
 }
 
 type FileStateDumper struct {
-	f   io.Writer
-	mtx sync.Mutex
+	f        io.Writer
+	ethCache map[common.Address]bool
+	mtx      sync.Mutex
 }
 
 func (s *FileStateDumper) WriteETH(address common.Address) {
 	s.mtx.Lock()
 	defer s.mtx.Unlock()
+	if s.ethCache[address] {
+		return
+	}
+	s.ethCache[address] = true
+
 	if _, err := s.f.Write([]byte(fmt.Sprintf("ETH|%s\n", address.Hex()))); err != nil {
 		panic(err)
 	}