anchor

Close Account

Two instruction handlers: create_user initializes a PDA User account, and close_user closes it and returns the rent to the user.

1. create_user initializes the PDA with Anchor's init constraint:

   #[account(
       init,
       payer = user,
       space = User::DISCRIMINATOR.len() + User::INIT_SPACE,
       seeds = [b"USER", user.key().as_ref()],
       bump,
   )]
   pub user_account: Account<'info, User>,

   See programs/close-account/src/instructions/create_user.rs.

2. close_user closes the account using Anchor's close constraint, which returns lamports to the given account:

   #[account(
       mut,
       seeds = [b"USER", user.key().as_ref()],
       bump = user_account.bump,
       close = user, // close account and return lamports to user
   )]
   pub user_account: Account<'info, User>,

   See programs/close-account/src/instructions/close_user.rs.

Tests

Tests live in programs/close-account/tests/test_close_account.rs and run against litesvm. Anchor.toml's scripts.test is cargo test, so anchor test builds the program and runs the Rust tests:

anchor test