send mutex

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)

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 {