graphql: add yParity field for transactions (#27882)

Co-authored-by: Felix Lange <fjl@twurst.com>

Author: jsvisa

graphql/graphql.go

@@ -566,6 +566,16 @@ func (t *Transaction) V(ctx context.Context) hexutil.Big {
 	return hexutil.Big(*v)
 }
 
+func (t *Transaction) YParity(ctx context.Context) (*hexutil.Uint64, error) {
+	tx, _ := t.resolve(ctx)
+	if tx == nil || tx.Type() == types.LegacyTxType {
+		return nil, nil
+	}
+	v, _, _ := tx.RawSignatureValues()
+	ret := hexutil.Uint64(v.Int64())
+	return &ret, nil
+}
+
 func (t *Transaction) Raw(ctx context.Context) (hexutil.Bytes, error) {
 	tx, _ := t.resolve(ctx)
 	if tx == nil {

graphql/schema.go

@@ -151,6 +151,7 @@ const schema string = `
         r: BigInt!
         s: BigInt!
         v: BigInt!
+        yParity: Long
         # Envelope transaction support
         type: Long
         accessList: [AccessTuple!]