Set the user's timestamp

pkg/leo/src/lib.rs

@@ -215,13 +215,16 @@ impl Leo {
                     position.amount.get(),
                     campaign.per_second.get(),
                 );
-                let seconds_since = U64::from(block::timestamp()) - campaign.started.get();
+                let timestamp = U64::from(block::timestamp());
+                let seconds_since = timestamp - campaign.started.get();
                 let rewards = base_rewards * U256::from(seconds_since);
                 // Track what's sent, and do a last-minute sanity check to make sure we don't
                 // send more than we should.
                 let new_distributed = campaign.distributed.get() + rewards;
                 campaign.distributed.set(new_distributed);
                 assert!(campaign.pool_amount.get() > new_distributed);
+                // Update the position's creation time so we don't double up on their rewards.
+                position.timestamp.set(timestamp);
                 // Now send the actual rewards, and return.
                 let token = campaign.token.get();
                 erc20::give(token, rewards).unwrap();

pkg/leo/src/maths.rs

@@ -1,7 +1,7 @@
 use stylus_sdk::alloy_primitives::U256;
 
 /// Returns `a * b / c` and if the result had carry. Copied from Seawater.
-pub fn _mul_div(a: U256, b: U256, mut denom_and_rem: U256) -> (U256, bool) {
+pub fn _mul_div(a: U256, b: U256, mut denom_and_rem: U256) -> U256 {
     assert!(!denom_and_rem.is_zero());
 
     let mut mul_and_quo = a.widening_mul::<256, 4, 512, 8>(b);
@@ -15,9 +15,9 @@ pub fn _mul_div(a: U256, b: U256, mut denom_and_rem: U256) -> (U256, bool) {
 
     let has_carry = denom_and_rem != U256::ZERO;
 
-    (U256::from_limbs_slice(&limbs[0..4]), has_carry)
+    U256::from_limbs_slice(&limbs[0..4])
 }
 
 pub fn calc_base_rewards(pool_lp: U256, our_lp: U256, rewards_per_sec: U256) -> U256 {
-    _mul_div(pool_lp, our_lp, rewards_per_sec).0
+    _mul_div(pool_lp, our_lp, rewards_per_sec)
 }