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January 1, 2025 12:17
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Display how to load a zero_copy account in rust integration test
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| let position_account = utils::get_zero_copy_account::<Position>(program_test_ctx, *position_pda).await; |
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| fn align_buffer(data: &[u8], align_to: usize) -> Vec<u8> { | |
| let layout = Layout::from_size_align(data.len(), align_to).expect("Invalid layout"); | |
| unsafe { | |
| let aligned_buf = std::alloc::alloc(layout); | |
| std::ptr::copy_nonoverlapping(data.as_ptr(), aligned_buf, data.len()); | |
| Vec::from_raw_parts(aligned_buf, data.len(), data.len()) | |
| } | |
| } | |
| pub async fn get_zero_copy_account<T: bytemuck::Pod>( | |
| program_test_ctx: &RwLock<ProgramTestContext>, | |
| key: Pubkey, | |
| ) -> T { | |
| let mut ctx = program_test_ctx.write().await; | |
| let banks_client = &mut ctx.banks_client; | |
| let account = banks_client.get_account(key).await.unwrap().unwrap(); | |
| // Have to have the data to be of the same alignment as the struct | |
| let data = &account.data.clone()[8..]; | |
| let aligned_data = align_buffer(data, std::mem::align_of::<T>()); | |
| *bytemuck::try_from_bytes::<T>(aligned_data.as_slice()).unwrap() | |
| } | |
| pub async fn try_get_zero_copy_account<T: bytemuck::Pod>( | |
| program_test_ctx: &RwLock<ProgramTestContext>, | |
| key: Pubkey, | |
| ) -> Option<T> { | |
| let mut ctx = program_test_ctx.write().await; | |
| let banks_client = &mut ctx.banks_client; | |
| let account = banks_client.get_account(key).await.unwrap(); | |
| // Have to have the data to be of the same alignment as the struct | |
| let data = &account.as_ref()?.data.clone()[8..]; | |
| let aligned_data = align_buffer(data, std::mem::align_of::<T>()); | |
| let tried = bytemuck::try_from_bytes::<T>(aligned_data.as_slice()); | |
| if let Ok(tried) = tried { | |
| Some(*tried) | |
| } else { | |
| None | |
| } | |
| } |
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| #[account(zero_copy)] | |
| #[derive(Default, Debug)] | |
| #[repr(C)] | |
| pub struct Position { | |
| pub bump: u8, | |
| pub side: u8, | |
| pub _padding: [u8; 6], | |
| pub owner: Pubkey, | |
| } |
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