introduce update ix

src/processor/mod.rs

@@ -5,6 +5,7 @@ mod mine;
 mod open;
 mod reset;
 mod stake;
+mod update;
 mod upgrade;
 
 pub use claim::*;
@@ -14,4 +15,5 @@ pub use mine::*;
 pub use open::*;
 pub use reset::*;
 pub use stake::*;
+pub use update::*;
 pub use upgrade::*;

src/processor/update.rs

@@ -0,0 +1,30 @@
+use solana_program::{
+    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
+    pubkey::Pubkey,
+};
+
+use crate::{instruction::UpdateArgs, loaders::*, state::Proof, utils::AccountDeserialize};
+
+/// Update updates a proof account.
+pub fn process_update<'a, 'info>(
+    _program_id: &Pubkey,
+    accounts: &'a [AccountInfo<'info>],
+    data: &[u8],
+) -> ProgramResult {
+    // Parse args
+    let args = UpdateArgs::try_from_bytes(data)?;
+
+    // Load accounts
+    let [signer, proof_info] = accounts else {
+        return Err(ProgramError::NotEnoughAccountKeys);
+    };
+    load_signer(signer)?;
+    load_proof(proof_info, signer.key, true)?;
+
+    // Update the proof
+    let mut proof_data = proof_info.data.borrow_mut();
+    let proof = Proof::try_from_bytes_mut(&mut proof_data)?;
+    proof.miner = args.new_miner;
+
+    Ok(())
+}