From 5d8d892185e55a29f4ddd350864a0a090db9f32a Mon Sep 17 00:00:00 2001
From: Felipe Andrade <felipe@oplabs.co>
Date: Wed, 6 Sep 2023 15:15:19 -0700
Subject: [PATCH] send mutex

---
 op-ufm/op-ufm/pkg/provider/roundtrip.go | 3 +++
 op-ufm/op-ufm/pkg/provider/tx_pool.go   | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/op-ufm/op-ufm/pkg/provider/roundtrip.go b/op-ufm/op-ufm/pkg/provider/roundtrip.go
index 7cd12aa..42b5659 100644
--- a/op-ufm/op-ufm/pkg/provider/roundtrip.go
+++ b/op-ufm/op-ufm/pkg/provider/roundtrip.go
@@ -34,6 +34,9 @@ func (p *Provider) RoundTrip(ctx context.Context) {
 		return
 	}
 
+	p.txPool.ExclusiveSend.Lock()
+	defer p.txPool.ExclusiveSend.Unlock()
+
 	txHash := common.Hash{}
 	attempt := 0
 	nonce := uint64(0)
diff --git a/op-ufm/op-ufm/pkg/provider/tx_pool.go b/op-ufm/op-ufm/pkg/provider/tx_pool.go
index ffdd214..2ea5f6a 100644
--- a/op-ufm/op-ufm/pkg/provider/tx_pool.go
+++ b/op-ufm/op-ufm/pkg/provider/tx_pool.go
@@ -18,6 +18,8 @@ type NetworkTransactionPool struct {
 
 	// Last time a transaction was sent
 	LastSend time.Time
+	// Prevents concurrent transaction send
+	ExclusiveSend sync.Mutex
 }
 
 type TransactionState struct {