Use TransactionBuilder in the Rewards transaction

programs/native/rewards_api/src/rewards_instruction.rs

@@ -1,6 +1,23 @@
+use crate::rewards_program;
 use serde_derive::{Deserialize, Serialize};
+use solana_sdk::pubkey::Pubkey;
+use solana_sdk::transaction_builder::BuilderInstruction;
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub enum RewardsInstruction {
     RedeemVoteCredits,
 }
+
+impl RewardsInstruction {
+    pub fn new_redeem_vote_credits(
+        vote_id: Pubkey,
+        rewards_id: Pubkey,
+        to_id: Pubkey,
+    ) -> BuilderInstruction {
+        BuilderInstruction::new(
+            rewards_program::id(),
+            &RewardsInstruction::RedeemVoteCredits,
+            vec![(vote_id, true), (rewards_id, false), (to_id, false)],
+        )
+    }
+}

programs/native/rewards_api/src/rewards_transaction.rs

@@ -5,10 +5,11 @@ use crate::rewards_instruction::RewardsInstruction;
 use crate::rewards_program;
 use solana_sdk::hash::Hash;
 use solana_sdk::pubkey::Pubkey;
-use solana_sdk::signature::Keypair;
+use solana_sdk::signature::{Keypair, KeypairUtil};
 use solana_sdk::system_transaction::SystemTransaction;
-use solana_sdk::transaction::{Instruction, Transaction};
+use solana_sdk::transaction::Transaction;
-use solana_sdk::vote_program::{self, VoteInstruction};
+use solana_sdk::transaction_builder::TransactionBuilder;
+use solana_sdk::vote_program::VoteInstruction;
 
 pub struct RewardsTransaction {}
 
@@ -38,16 +39,12 @@ impl RewardsTransaction {
         last_id: Hash,
         fee: u64,
     ) -> Transaction {
-        Transaction::new_with_instructions(
+        let vote_id = vote_keypair.pubkey();
-            &[vote_keypair],
+        TransactionBuilder::new(fee)
-            &[rewards_id, to_id],
+            .push(RewardsInstruction::new_redeem_vote_credits(
-            last_id,
+                vote_id, rewards_id, to_id,
-            fee,
+            ))
-            vec![rewards_program::id(), vote_program::id()],
+            .push(VoteInstruction::new_clear_credits(vote_id))
-            vec![
+            .sign(&[vote_keypair], last_id)
-                Instruction::new(0, &RewardsInstruction::RedeemVoteCredits, vec![0, 1, 2]),
-                Instruction::new(1, &VoteInstruction::ClearCredits, vec![0]),
-            ],
-        )
     }
 }

sdk/src/vote_program.rs

@@ -4,6 +4,7 @@
 use crate::account::{Account, KeyedAccount};
 use crate::native_program::ProgramError;
 use crate::pubkey::Pubkey;
+use crate::transaction_builder::BuilderInstruction;
 use bincode::{deserialize, serialize_into, serialized_size, ErrorKind};
 use log::*;
 use std::collections::VecDeque;
@@ -78,6 +79,12 @@ pub enum VoteInstruction {
     ClearCredits,
 }
 
+impl VoteInstruction {
+    pub fn new_clear_credits(vote_id: Pubkey) -> BuilderInstruction {
+        BuilderInstruction::new(id(), &VoteInstruction::ClearCredits, vec![(vote_id, true)])
+    }
+}
+
 #[derive(Debug, Default, Serialize, Deserialize, PartialEq, Eq)]
 pub struct VoteState {
     pub votes: VecDeque<Lockout>,