Add rate limit on staking transactions

pallets/admin-utils/tests/mock.rs

@@ -110,6 +110,8 @@ parameter_types! {
     pub const InitialNetworkLockReductionInterval: u64 = 2; // 2 blocks.
     pub const InitialSubnetLimit: u16 = 10; // Max 10 subnets.
     pub const InitialNetworkRateLimit: u64 = 0;
+    pub const InitialTargetStakesPerInterval: u16 = 1;
+
 }
 
 impl pallet_subtensor::Config for Test {
@@ -158,6 +160,7 @@ impl pallet_subtensor::Config for Test {
     type InitialNetworkLockReductionInterval = InitialNetworkLockReductionInterval;
     type InitialSubnetLimit = InitialSubnetLimit;
     type InitialNetworkRateLimit = InitialNetworkRateLimit;
+    type InitialTargetStakesPerInterval = InitialTargetStakesPerInterval;
 }
 
 impl system::Config for Test {

pallets/subtensor/src/lib.rs

@@ -182,6 +182,8 @@ pub mod pallet {
         type InitialSubnetLimit: Get<u16>;
         #[pallet::constant] // Initial network creation rate limit
         type InitialNetworkRateLimit: Get<u64>;
+        #[pallet::constant] // Initial target stakes per interval issuance.
+        type InitialTargetStakesPerInterval: Get<u64>;
     }
 
     pub type AccountIdOf<T> = <T as frame_system::Config>::AccountId;
@@ -212,6 +214,10 @@ pub mod pallet {
         0
     }
     #[pallet::type_value]
+    pub fn DefaultStakesPerInterval<T: Config>() -> (u64, u64) {
+        (0, 0)
+    }
+    #[pallet::type_value]
     pub fn DefaultBlockEmission<T: Config>() -> u64 {
         1_000_000_000
     }
@@ -227,6 +233,14 @@ pub mod pallet {
     pub fn DefaultAccount<T: Config>() -> T::AccountId {
         T::AccountId::decode(&mut TrailingZeroInput::zeroes()).unwrap()
     }
+    #[pallet::type_value]
+    pub fn DefaultTargetStakesPerInterval<T: Config>() -> u64 {
+        T::InitialTargetStakesPerInterval::get()
+    }
+    #[pallet::type_value]
+    pub fn DefaultStakeInterval<T: Config>() -> u64 {
+        360
+    }
 
     #[pallet::storage] // --- ITEM ( total_stake )
     pub type TotalStake<T> = StorageValue<_, u64, ValueQuery>;
@@ -236,12 +250,22 @@ pub mod pallet {
     pub type BlockEmission<T> = StorageValue<_, u64, ValueQuery, DefaultBlockEmission<T>>;
     #[pallet::storage] // --- ITEM ( total_issuance )
     pub type TotalIssuance<T> = StorageValue<_, u64, ValueQuery, DefaultTotalIssuance<T>>;
+    #[pallet::storage] // --- ITEM (target_stakes_per_interval)
+    pub type TargetStakesPerInterval<T> =
+        StorageValue<_, u64, ValueQuery, DefaultTargetStakesPerInterval<T>>;
+    #[pallet::storage] // --- ITEM (default_stake_interval)
+    pub type StakeInterval<T> = StorageValue<_, u64, ValueQuery, DefaultStakeInterval<T>>;
     #[pallet::storage] // --- MAP ( hot ) --> stake | Returns the total amount of stake under a hotkey.
     pub type TotalHotkeyStake<T: Config> =
         StorageMap<_, Identity, T::AccountId, u64, ValueQuery, DefaultAccountTake<T>>;
     #[pallet::storage] // --- MAP ( cold ) --> stake | Returns the total amount of stake under a coldkey.
     pub type TotalColdkeyStake<T: Config> =
         StorageMap<_, Identity, T::AccountId, u64, ValueQuery, DefaultAccountTake<T>>;
+    #[pallet::storage]
+    // --- MAP (hot) --> stake | Returns a tuple (u64: stakes, u64: block_number)
+    pub type TotalHotkeyStakesThisInterval<T: Config> =
+        StorageMap<_, Identity, T::AccountId, (u64, u64), ValueQuery, DefaultStakesPerInterval<T>>;
+
     #[pallet::storage] // --- MAP ( hot ) --> cold | Returns the controlling coldkey for a hotkey.
     pub type Owner<T: Config> =
         StorageMap<_, Blake2_128Concat, T::AccountId, T::AccountId, ValueQuery, DefaultAccount<T>>;
@@ -924,7 +948,9 @@ pub mod pallet {
         MaxAllowedUidsExceeded, // --- Thrown when number of accounts going to be registered exceeds MaxAllowedUids for the network.
         TooManyUids, // ---- Thrown when the caller attempts to set weights with more uids than allowed.
         TxRateLimitExceeded, // --- Thrown when a transactor exceeds the rate limit for transactions.
-        RegistrationDisabled, // --- Thrown when registration is disabled
+        StakeRateLimitExceeded, // --- Thrown when a transactor exceeds the rate limit for stakes.
+        UnstakeRateLimitExceeded, // --- Thrown when a transactor exceeds the rate limit for unstakes.
+        RegistrationDisabled,     // --- Thrown when registration is disabled
         TooManyRegistrationsThisInterval, // --- Thrown when registration attempt exceeds allowed in interval
         BenchmarkingOnly, // --- Thrown when a function is only available for benchmarking
         HotkeyOriginMismatch, // --- Thrown when the hotkey passed is not the origin, but it should be
@@ -1822,14 +1848,32 @@ where
                     return Err(InvalidTransaction::Call.into());
                 }
             }
-            Some(Call::add_stake { .. }) => Ok(ValidTransaction {
-                priority: Self::get_priority_vanilla(),
-                ..Default::default()
-            }),
-            Some(Call::remove_stake { .. }) => Ok(ValidTransaction {
-                priority: Self::get_priority_vanilla(),
-                ..Default::default()
-            }),
+            Some(Call::add_stake { hotkey, .. }) => {
+                let stakes_this_interval = Pallet::<T>::get_stakes_this_interval_for_hotkey(hotkey);
+                let max_stakes_per_interval = Pallet::<T>::get_target_stakes_per_interval();
+
+                if stakes_this_interval >= max_stakes_per_interval {
+                    return InvalidTransaction::ExhaustsResources.into();
+                }
+
+                Ok(ValidTransaction {
+                    priority: Self::get_priority_vanilla(),
+                    ..Default::default()
+                })
+            }
+            Some(Call::remove_stake { hotkey, .. }) => {
+                let stakes_this_interval = Pallet::<T>::get_stakes_this_interval_for_hotkey(hotkey);
+                let max_stakes_per_interval = Pallet::<T>::get_target_stakes_per_interval();
+
+                if stakes_this_interval >= max_stakes_per_interval {
+                    return InvalidTransaction::ExhaustsResources.into();
+                }
+
+                Ok(ValidTransaction {
+                    priority: Self::get_priority_vanilla(),
+                    ..Default::default()
+                })
+            }
             Some(Call::register { netuid, .. } | Call::burned_register { netuid, .. }) => {
                 let registrations_this_interval =
                     Pallet::<T>::get_registrations_this_interval(*netuid);

pallets/subtensor/src/staking.rs

@@ -164,27 +164,39 @@ impl<T: Config> Pallet<T> {
             Error::<T>::TxRateLimitExceeded
         );
 
-        // --- 7. Ensure the remove operation from the coldkey is a success.
+        // --- 7. Ensure we don't exceed stake rate limit
+        let stakes_this_interval = Self::get_stakes_this_interval_for_hotkey(&hotkey);
+        ensure!(
+            stakes_this_interval < Self::get_target_stakes_per_interval(),
+            Error::<T>::StakeRateLimitExceeded
+        );
+
+        // --- 8. Ensure the remove operation from the coldkey is a success.
         ensure!(
             Self::remove_balance_from_coldkey_account(&coldkey, stake_as_balance.unwrap()) == true,
             Error::<T>::BalanceWithdrawalError
         );
 
-        // --- 8. If we reach here, add the balance to the hotkey.
+        // --- 9. If we reach here, add the balance to the hotkey.
         Self::increase_stake_on_coldkey_hotkey_account(&coldkey, &hotkey, stake_to_be_added);
 
         // Set last block for rate limiting
         Self::set_last_tx_block(&coldkey, block);
 
-        // --- 9. Emit the staking event.
+        // --- 10. Emit the staking event.
+        Self::set_stakes_this_interval_for_hotkey(
+            &hotkey,
+            stakes_this_interval + 1,
+            block,
+        );
         log::info!(
             "StakeAdded( hotkey:{:?}, stake_to_be_added:{:?} )",
             hotkey,
             stake_to_be_added
         );
         Self::deposit_event(Event::StakeAdded(hotkey, stake_to_be_added));
 
-        // --- 10. Ok and return.
+        // --- 11. Ok and return.
         Ok(())
     }
 
@@ -273,24 +285,36 @@ impl<T: Config> Pallet<T> {
             Error::<T>::TxRateLimitExceeded
         );
 
-        // --- 7. We remove the balance from the hotkey.
+        // --- 7. Ensure we don't exceed stake rate limit
+        let unstakes_this_interval = Self::get_stakes_this_interval_for_hotkey(&hotkey);
+        ensure!(
+            unstakes_this_interval < Self::get_target_stakes_per_interval(),
+            Error::<T>::UnstakeRateLimitExceeded
+        );
+
+        // --- 8. We remove the balance from the hotkey.
         Self::decrease_stake_on_coldkey_hotkey_account(&coldkey, &hotkey, stake_to_be_removed);
 
-        // --- 8. We add the balancer to the coldkey.  If the above fails we will not credit this coldkey.
+        // --- 9. We add the balancer to the coldkey.  If the above fails we will not credit this coldkey.
         Self::add_balance_to_coldkey_account(&coldkey, stake_to_be_added_as_currency.unwrap());
 
         // Set last block for rate limiting
         Self::set_last_tx_block(&coldkey, block);
 
-        // --- 9. Emit the unstaking event.
+        // --- 10. Emit the unstaking event.
+        Self::set_stakes_this_interval_for_hotkey(
+            &hotkey,
+            unstakes_this_interval + 1,
+            block,
+        );
         log::info!(
             "StakeRemoved( hotkey:{:?}, stake_to_be_removed:{:?} )",
             hotkey,
             stake_to_be_removed
         );
         Self::deposit_event(Event::StakeRemoved(hotkey, stake_to_be_removed));
 
-        // --- 10. Done and ok.
+        // --- 11. Done and ok.
         Ok(())
     }
 
@@ -342,6 +366,37 @@ impl<T: Config> Pallet<T> {
         return Stake::<T>::get(hotkey, coldkey);
     }
 
+    // Retrieves the total stakes for a given hotkey (account ID) for the current staking interval.
+    pub fn get_stakes_this_interval_for_hotkey(hotkey: &T::AccountId) -> u64 {
+        // Retrieve the configured stake interval duration from storage.
+        let stake_interval = StakeInterval::<T>::get();
+
+        // Obtain the current block number as an unsigned 64-bit integer.
+        let current_block = Self::get_current_block_as_u64();
+
+        // Fetch the total stakes and the last block number when stakes were made for the hotkey.
+        let (stakes, block_last_staked_at) = TotalHotkeyStakesThisInterval::<T>::get(hotkey);
+
+        // Calculate the block number after which the stakes for the hotkey should be reset.
+        let block_to_reset_after = block_last_staked_at + stake_interval;
+
+        // If the current block number is beyond the reset point,
+        // it indicates the end of the staking interval for the hotkey.
+        if block_to_reset_after <= current_block {
+            // Reset the stakes for this hotkey for the current interval.
+            Self::set_stakes_this_interval_for_hotkey(hotkey, 0, block_last_staked_at);
+            // Return 0 as the stake amount since we've just reset the stakes.
+            return 0;
+        }
+
+        // If the staking interval has not yet ended, return the current stake amount.
+        stakes
+    }
+
+    pub fn get_target_stakes_per_interval() -> u64 {
+        return TargetStakesPerInterval::<T>::get();
+    }
+
     // Creates a cold - hot pairing account if the hotkey is not already an active account.
     //
     pub fn create_account_if_non_existent(coldkey: &T::AccountId, hotkey: &T::AccountId) {

pallets/subtensor/src/utils.rs

@@ -137,7 +137,15 @@ impl<T: Config> Pallet<T> {
         WeightsMinStake::<T>::put(min_stake);
         Self::deposit_event(Event::WeightsMinStake(min_stake));
     }
-
+    pub fn set_target_stakes_per_interval(target_stakes_per_interval: u64) {
+        TargetStakesPerInterval::<T>::set(target_stakes_per_interval)
+    }
+    pub fn set_stakes_this_interval_for_hotkey(hotkey: &T::AccountId, stakes_this_interval: u64, last_staked_block_number: u64) {
+        TotalHotkeyStakesThisInterval::<T>::insert(hotkey, (stakes_this_interval, last_staked_block_number));
+    }
+    pub fn set_stake_interval(block: u64) {
+        StakeInterval::<T>::set(block);
+    }
     pub fn get_rank_for_uid(netuid: u16, uid: u16) -> u16 {
         let vec = Rank::<T>::get(netuid);
         if (uid as usize) < vec.len() {

pallets/subtensor/tests/mock.rs

@@ -160,6 +160,7 @@ parameter_types! {
     pub const InitialNetworkLockReductionInterval: u64 = 2; // 2 blocks.
     pub const InitialSubnetLimit: u16 = 10; // Max 10 subnets.
     pub const InitialNetworkRateLimit: u64 = 0;
+    pub const InitialTargetStakesPerInterval: u16 = 1;
 }
 
 // Configure collective pallet for council
@@ -357,6 +358,7 @@ impl pallet_subtensor::Config for Test {
     type InitialNetworkLockReductionInterval = InitialNetworkLockReductionInterval;
     type InitialSubnetLimit = InitialSubnetLimit;
     type InitialNetworkRateLimit = InitialNetworkRateLimit;
+    type InitialTargetStakesPerInterval = InitialTargetStakesPerInterval;
 }
 
 impl pallet_utility::Config for Test {

pallets/subtensor/tests/senate.rs

@@ -505,6 +505,8 @@ fn test_senate_not_leave_when_stake_removed() {
         let burn_cost = 1000;
         let coldkey_account_id = U256::from(667); // Neighbour of the beast, har har
 
+        SubtensorModule::set_target_stakes_per_interval(2);
+
         //add network
         SubtensorModule::set_burn(netuid, burn_cost);
         add_network(netuid, tempo, 0);