Increase the fee rate limit and log fee growth within the swap instruction (#104)

* Increase the fee rate limit and log fee growth within the swap instruction

* PR feedback

* log reward_growth

* remove .only

* only perform 1 log

* Revert "only perform 1 log"

This reverts commit 2ab6c5b6d2c3a29632d2285f6145231349720429.

* Revert "remove .only"

This reverts commit a39f15f6e55996155d00c26817966b22e6b26e95.

* Revert "log reward_growth"

This reverts commit f54e2060dde17c0ebb5cf5c30806c613088db165.

---------

Co-authored-by: Otto Cheung <otto@orca.so>

programs/whirlpool/src/manager/swap_manager.rs

@@ -1,3 +1,5 @@
+use solana_program::msg;
+
 use crate::{
     errors::ErrorCode,
     manager::{
@@ -186,6 +188,15 @@ pub fn swap(
         (amount_calculated, amount - amount_remaining)
     };
 
+    let fee_growth = if a_to_b {
+        curr_fee_growth_global_input - whirlpool.fee_growth_global_a
+    } else {
+        curr_fee_growth_global_input - whirlpool.fee_growth_global_b
+    };
+
+    // Log delta in fee growth to track pool usage over time with off-chain analytics
+    msg!("fee_growth: {}", fee_growth);
+
     Ok(PostSwapUpdate {
         amount_a,
         amount_b,

programs/whirlpool/src/math/token_math.rs

@@ -8,8 +8,8 @@ use super::{
 
 // Fee rate is represented as hundredths of a basis point.
 // Fee amount = total_amount * fee_rate / 1_000_000.
-// Max fee rate supported is 1%.
-pub const MAX_FEE_RATE: u16 = 10_000;
+// Max fee rate supported is 3%.
+pub const MAX_FEE_RATE: u16 = 30_000;
 
 // Assuming that FEE_RATE is represented as hundredths of a basis point
 // We want FEE_RATE_MUL_VALUE = 1/FEE_RATE_UNIT, so 1e6