add timestamp to clock

program_methods/guest/src/bin/clock.rs

@@ -1,12 +1,12 @@
 use nssa_core::program::{AccountPostState, ProgramInput, read_nssa_inputs, write_nssa_outputs};
 
-type Instruction = ();
+type Instruction = nssa_core::Timestamp;
 
 fn main() {
     let (
         ProgramInput {
             pre_states,
-            instruction: (),
+            instruction: timestamp,
         },
         instruction_words,
     ) = read_nssa_inputs::<Instruction>();
@@ -16,20 +16,24 @@ fn main() {
     };
 
     let account_pre = &pre.account;
-    let account_pre_data = account_pre.data.clone();
-    let clock =
-        u64::from_le_bytes(account_pre_data.into_inner().try_into().expect(
-            "Block context program account data should be the LE encoding of a u64 integer",
-        ));
+    let account_pre_data = account_pre.data.clone().into_inner();
+    let block_id = u64::from_le_bytes(
+        account_pre_data[..8]
+            .try_into()
+            .expect("Block context program account data should contain a LE-encoded block_id u64"),
+    );
 
     let mut account_post = account_pre.clone();
-    account_post.data = clock
+    let next_block_id = block_id
         .checked_add(1)
-        .expect("Next timestap should be within u64 boundaries")
-        .to_le_bytes()
+        .expect("Next block id should be within u64 boundaries");
+    let mut data = [0u8; 16];
+    data[..8].copy_from_slice(&next_block_id.to_le_bytes());
+    data[8..].copy_from_slice(&timestamp.to_le_bytes());
+    account_post.data = data
         .to_vec()
         .try_into()
-        .expect("u64 byte length should fit in account data");
+        .expect("16 bytes should fit in account data");
 
     let post = AccountPostState::new(account_post);