From f33fcda9ef065dde20f64a4fd89040a50e5659f4 Mon Sep 17 00:00:00 2001
From: Djadih <13135116+Djadih@users.noreply.github.com>
Date: Wed, 26 Apr 2023 16:18:30 -0500
Subject: [PATCH] Implement marshaling for BlockNumber

---
 rpc/types.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/rpc/types.go b/rpc/types.go
index 4176922111..feaeecd358 100644
--- a/rpc/types.go
+++ b/rpc/types.go
@@ -98,6 +98,22 @@ func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+// MarshalText implements encoding.TextMarshaler. It marshals:
+// - "latest", "earliest" or "pending" as strings
+// - other numbers as hex
+func (bn BlockNumber) MarshalText() ([]byte, error) {
+	switch bn {
+	case EarliestBlockNumber:
+		return []byte("earliest"), nil
+	case LatestBlockNumber:
+		return []byte("latest"), nil
+	case PendingBlockNumber:
+		return []byte("pending"), nil
+	default:
+		return hexutil.Uint64(bn).MarshalText()
+	}
+}
+
 func (bn BlockNumber) Int64() int64 {
 	return (int64)(bn)
 }