Bump all native programs up a level

Don't categorize programs by a single backend.

programs/rewards_api/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "solana-rewards-api"
+version = "0.12.0"
+description = "Solana rewards API"
+authors = ["Solana Maintainers <maintainers@solana.com>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+bincode = "1.1.2"
+serde = "1.0.89"
+serde_derive = "1.0.89"
+solana-sdk = { path = "../../sdk", version = "0.12.0" }
+solana-vote-api = { path = "../vote_api", version = "0.12.0" }
+
+[lib]
+name = "solana_rewards_api"
+crate-type = ["lib"]

programs/rewards_api/src/lib.rs

@@ -0,0 +1,18 @@
+pub mod rewards_instruction;
+pub mod rewards_state;
+pub mod rewards_transaction;
+
+use solana_sdk::pubkey::Pubkey;
+
+const REWARDS_PROGRAM_ID: [u8; 32] = [
+    133, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0,
+];
+
+pub fn check_id(program_id: &Pubkey) -> bool {
+    program_id.as_ref() == REWARDS_PROGRAM_ID
+}
+
+pub fn id() -> Pubkey {
+    Pubkey::new(&REWARDS_PROGRAM_ID)
+}

programs/rewards_api/src/rewards_instruction.rs

@@ -0,0 +1,19 @@
+use crate::id;
+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) -> BuilderInstruction {
+        BuilderInstruction::new(
+            id(),
+            &RewardsInstruction::RedeemVoteCredits,
+            vec![(vote_id, true), (rewards_id, false)],
+        )
+    }
+}

programs/rewards_api/src/rewards_state.rs

@@ -0,0 +1,13 @@
+use bincode::serialized_size;
+use serde_derive::{Deserialize, Serialize};
+
+#[derive(Debug, Default, Serialize, Deserialize, PartialEq, Eq)]
+pub struct RewardsState {}
+
+impl RewardsState {
+    /// Upper limit on the serialized size of RewardsState.
+    pub fn max_size() -> usize {
+        let rewards_state = RewardsState::default();
+        serialized_size(&rewards_state).unwrap() as usize
+    }
+}

programs/rewards_api/src/rewards_transaction.rs

@@ -0,0 +1,50 @@
+//! The `rewards_transaction` module provides functionality for creating a global
+//! rewards account and enabling stakers to redeem credits from their vote accounts.
+
+use crate::id;
+use crate::rewards_instruction::RewardsInstruction;
+use crate::rewards_state::RewardsState;
+use solana_sdk::hash::Hash;
+use solana_sdk::pubkey::Pubkey;
+use solana_sdk::signature::{Keypair, KeypairUtil};
+use solana_sdk::system_transaction::SystemTransaction;
+use solana_sdk::transaction::Transaction;
+use solana_sdk::transaction_builder::TransactionBuilder;
+use solana_vote_api::vote_instruction::VoteInstruction;
+
+pub struct RewardsTransaction {}
+
+impl RewardsTransaction {
+    pub fn new_account(
+        from_keypair: &Keypair,
+        rewards_id: Pubkey,
+        blockhash: Hash,
+        num_tokens: u64,
+        fee: u64,
+    ) -> Transaction {
+        SystemTransaction::new_program_account(
+            from_keypair,
+            rewards_id,
+            blockhash,
+            num_tokens,
+            RewardsState::max_size() as u64,
+            id(),
+            fee,
+        )
+    }
+
+    pub fn new_redeem_credits(
+        vote_keypair: &Keypair,
+        rewards_id: Pubkey,
+        blockhash: Hash,
+        fee: u64,
+    ) -> Transaction {
+        let vote_id = vote_keypair.pubkey();
+        TransactionBuilder::new(fee)
+            .push(RewardsInstruction::new_redeem_vote_credits(
+                vote_id, rewards_id,
+            ))
+            .push(VoteInstruction::new_clear_credits(vote_id))
+            .sign(&[vote_keypair], blockhash)
+    }
+}