This is a simple Solana program that manages a counter. It allows incrementing, decrementing, updating, and resetting the counter.
The program supports the following instructions:
- Increment: Increases the counter by a specified value.
- Decrement: Decreases the counter by a specified value. If the value is greater than the current counter value, the counter is set to 0.
- Update: Sets the counter to a specified value.
- Reset: Resets the counter to 0.
To use this program, you can interact with it by creating transactions that include the appropriate instructions. The instructions are encoded as specified in the CounterInstructions enum.
- Increment:
0followed by a little-endian encoding of the increment value (u32). - Decrement:
1followed by a little-endian encoding of the decrement value (u32). - Update:
2followed by a little-endian encoding of the new value (u32). - Reset:
3(no additional data).
Here is a simple example of how to interact with the Solana Counter Program using the provided test:
#[test]
fn test_counter() {
// Setup accounts and program ID
// ...
// Increment
let mut increment_instruction_data: Vec<u8> = vec![0];
let increment_value = 40u32;
increment_instruction_data.extend_from_slice(&increment_value.to_le_bytes());
process_instruction(&program_id, &accounts, &increment_instruction_data).unwrap();
assert_eq!(/* ... */);
// Decrement
let mut decrement_instruction_data: Vec<u8> = vec![1];
let decrement_value = 20u32;
decrement_instruction_data.extend_from_slice(&decrement_value.to_le_bytes());
process_instruction(&program_id, &accounts, &decrement_instruction_data).unwrap();
assert_eq!(/* ... */);
// Update
let mut update_instruction_data: Vec<u8> = vec![2];
let update_value = 33u32;
update_instruction_data.extend_from_slice(&update_value.to_le_bytes());
process_instruction(&program_id, &accounts, &update_instruction_data).unwrap();
assert_eq!(/* ... */);
// Reset
let reset_instruction_data: Vec<u8> = vec![3];
process_instruction(&program_id, &accounts, &reset_instruction_data).unwrap();
assert_eq!(/* ... */);
}
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