[solana] reclaim rent (#1266)

* Checkpoint

* Checkpoint

* Cleanup

* Checkpoint, debug

* Go

* Checkpoint

* Fix

* Add new error and test

* Cleanup

* Add another test

* Keep adding errors

* Another test

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* Nice

* Ship it

target_chains/solana/programs/pyth-solana-receiver/src/lib.rs

@@ -217,6 +217,10 @@ pub mod pyth_solana_receiver {
 
         Ok(())
     }
+
+    pub fn reclaim_rent(_ctx: Context<ReclaimRent>) -> Result<()> {
+        Ok(())
+    }
 }
 
 pub const CONFIG_SEED: &str = "config";
@@ -295,6 +299,14 @@ pub struct PostUpdatesAtomic<'info> {
     pub system_program:       Program<'info, System>,
 }
 
+#[derive(Accounts)]
+pub struct ReclaimRent<'info> {
+    #[account(mut)]
+    pub payer:                Signer<'info>,
+    #[account(mut, close = payer, constraint = price_update_account.write_authority == payer.key() @ ReceiverError::WrongWriteAuthority)]
+    pub price_update_account: Account<'info, PriceUpdateV1>,
+}
+
 #[derive(Debug, AnchorSerialize, AnchorDeserialize, Clone)]
 pub struct PostUpdatesAtomicParams {
     pub vaa:                 Vec<u8>,

target_chains/solana/programs/pyth-solana-receiver/src/sdk.rs

@@ -88,6 +88,16 @@ impl accounts::AcceptGovernanceAuthorityTransfer {
     }
 }
 
+impl accounts::ReclaimRent {
+    pub fn populate(payer: Pubkey, price_update_account: Pubkey) -> Self {
+        let _config = get_config_address();
+        accounts::ReclaimRent {
+            payer,
+            price_update_account,
+        }
+    }
+}
+
 impl instruction::Initialize {
     pub fn populate(payer: &Pubkey, initial_config: Config) -> Instruction {
         Instruction {
@@ -229,6 +239,18 @@ impl instruction::AcceptGovernanceAuthorityTransfer {
     }
 }
 
+impl instruction::ReclaimRent {
+    pub fn populate(payer: Pubkey, price_update_account: Pubkey) -> Instruction {
+        let governance_accounts =
+            accounts::ReclaimRent::populate(payer, price_update_account).to_account_metas(None);
+        Instruction {
+            program_id: ID,
+            accounts:   governance_accounts,
+            data:       instruction::ReclaimRent {}.data(),
+        }
+    }
+}
+
 
 pub fn get_treasury_address() -> Pubkey {
     Pubkey::find_program_address(&[TREASURY_SEED.as_ref()], &ID).0

target_chains/solana/programs/pyth-solana-receiver/tests/test_post_updates.rs

@@ -10,7 +10,10 @@ use {
     program_simulator::into_transaction_error,
     pyth_solana_receiver::{
         error::ReceiverError,
-        instruction::PostUpdates,
+        instruction::{
+            PostUpdates,
+            ReclaimRent,
+        },
         sdk::deserialize_accumulator_update_data,
         state::price_update::{
             PriceUpdateV1,
@@ -120,6 +123,38 @@ async fn test_post_updates() {
         Message::PriceFeedMessage(price_update_account.price_message),
         feed_2
     );
+
+    // This poster doesn't have the write authority
+    let poster_2 = program_simulator.get_funded_keypair().await.unwrap();
+    assert_eq!(
+        program_simulator
+            .process_ix_with_default_compute_limit(
+                ReclaimRent::populate(poster_2.pubkey(), price_update_keypair.pubkey()),
+                &vec![&poster_2],
+                None,
+            )
+            .await
+            .unwrap_err()
+            .unwrap(),
+        into_transaction_error(ReceiverError::WrongWriteAuthority)
+    );
+
+    program_simulator
+        .process_ix_with_default_compute_limit(
+            ReclaimRent::populate(poster.pubkey(), price_update_keypair.pubkey()),
+            &vec![&poster],
+            None,
+        )
+        .await
+        .unwrap();
+
+    assert_eq!(
+        program_simulator
+            .get_balance(price_update_keypair.pubkey())
+            .await
+            .unwrap(),
+        0
+    );
 }
 
 #[tokio::test]