add a min activity cutoff and default

Author: camfairchild

pallets/admin-utils/src/lib.rs

@@ -500,6 +500,12 @@ pub mod pallet {
                 pallet_subtensor::Pallet::<T>::if_subnet_exist(netuid),
                 Error::<T>::SubnetDoesNotExist
             );
+
+            ensure!(
+                activity_cutoff >= pallet_subtensor::MinActivityCutoff::<T>::get(),
+                pallet_subtensor::Error::<T>::ActivityCutoffTooLow
+            );
+
             pallet_subtensor::Pallet::<T>::set_activity_cutoff(netuid, activity_cutoff);
             log::debug!(
                 "ActivityCutoffSet( netuid: {:?} activity_cutoff: {:?} ) ",

pallets/subtensor/src/lib.rs

@@ -794,6 +794,16 @@ pub mod pallet {
         I96F32::saturating_from_num(10_000_000)
     }
 
+    #[pallet::type_value]
+    /// Default value for minimum activity cutoff
+    pub fn DefaultMinActivityCutoff<T: Config>() -> u16 {
+        360
+    }
+
+    #[pallet::storage]
+    pub type MinActivityCutoff<T: Config> =
+        StorageValue<_, u16, ValueQuery, DefaultMinActivityCutoff<T>>;
+
     #[pallet::storage]
     pub type ColdkeySwapScheduleDuration<T: Config> =
         StorageValue<_, BlockNumberFor<T>, ValueQuery, DefaultColdkeySwapScheduleDuration<T>>;

pallets/subtensor/src/macros/errors.rs

@@ -191,5 +191,7 @@ mod errors {
         SlippageTooHigh,
         /// Subnet disallows transfer.
         TransferDisallowed,
+        /// Activity cutoff is being set too low.
+        ActivityCutoffTooLow,
     }
 }