Fix rate limit for setting children

Author: gztensor

pallets/subtensor/src/staking/set_children.rs

@@ -61,12 +61,22 @@ impl<T: Config> Pallet<T> {
         // Ensure the hotkey passes the rate limit.
         ensure!(
             Self::passes_rate_limit_globally(
-                &TransactionType::SetChildren, // Set children.
                 &hotkey,                       // Specific to a hotkey.
+                netuid,                        // Specific to a subnet.
+                &TransactionType::SetChildren, // Set children.
             ),
             Error::<T>::TxRateLimitExceeded
         );
 
+        // Set last transaction block
+        let current_block = Self::get_current_block_as_u64();
+        Self::set_last_transaction_block(
+            &hotkey,
+            netuid,
+            &TransactionType::SetChildren,
+            current_block
+        );
+
         // --- 2. Check that this delegation is not on the root network. Child hotkeys are not valid on root.
         ensure!(
             netuid != Self::get_root_netuid(),

pallets/subtensor/src/utils/rate_limiting.rs

@@ -58,8 +58,11 @@ impl<T: Config> Pallet<T> {
     }
 
     /// Check if a transaction should be rate limited globally
-    pub fn passes_rate_limit_globally(tx_type: &TransactionType, hotkey: &T::AccountId) -> bool {
-        let netuid: u16 = u16::MAX;
+    pub fn passes_rate_limit_globally(
+        hotkey: &T::AccountId,
+        netuid: u16,
+        tx_type: &TransactionType,
+    ) -> bool {
         let block: u64 = Self::get_current_block_as_u64();
         let limit: u64 = Self::get_rate_limit(tx_type);
         let last_block: u64 = Self::get_last_transaction_block(hotkey, netuid, tx_type);