Support Staking Payout to Any Account (#6832)

* Support staking payout to any account

* fix offences benchmarks

substrate/frame/staking/src/lib.rs

@@ -425,16 +425,18 @@ pub enum StakerStatus<AccountId> {
 
 /// A destination account for payment.
 #[derive(PartialEq, Eq, Copy, Clone, Encode, Decode, RuntimeDebug)]
-pub enum RewardDestination {
+pub enum RewardDestination<AccountId> {
 	/// Pay into the stash account, increasing the amount at stake accordingly.
 	Staked,
 	/// Pay into the stash account, not increasing the amount at stake.
 	Stash,
 	/// Pay into the controller account.
 	Controller,
+	/// Pay into a specified account.
+	Account(AccountId),
 }
 
-impl Default for RewardDestination {
+impl<AccountId> Default for RewardDestination<AccountId> {
 	fn default() -> Self {
 		RewardDestination::Staked
 	}
@@ -1049,7 +1051,7 @@ decl_storage! {
 			=> Option<StakingLedger<T::AccountId, BalanceOf<T>>>;
 
 		/// Where the reward payment should be made. Keyed by stash.
-		pub Payee get(fn payee): map hasher(twox_64_concat) T::AccountId => RewardDestination;
+		pub Payee get(fn payee): map hasher(twox_64_concat) T::AccountId => RewardDestination<T::AccountId>;
 
 		/// The map from (wannabe) validator stash key to the preferences of that validator.
 		pub Validators get(fn validators):
@@ -1496,7 +1498,7 @@ decl_module! {
 		pub fn bond(origin,
 			controller: <T::Lookup as StaticLookup>::Source,
 			#[compact] value: BalanceOf<T>,
-			payee: RewardDestination,
+			payee: RewardDestination<T::AccountId>,
 		) {
 			let stash = ensure_signed(origin)?;
 
@@ -1830,7 +1832,7 @@ decl_module! {
 		///     - Write: Payee
 		/// # </weight>
 		#[weight = 11 * WEIGHT_PER_MICROS + T::DbWeight::get().reads_writes(1, 1)]
-		fn set_payee(origin, payee: RewardDestination) {
+		fn set_payee(origin, payee: RewardDestination<T::AccountId>) {
 			let controller = ensure_signed(origin)?;
 			let ledger = Self::ledger(&controller).ok_or(Error::<T>::NotController)?;
 			let stash = &ledger.stash;
@@ -2489,6 +2491,9 @@ impl<T: Trait> Module<T> {
 					Self::update_ledger(&controller, &l);
 					r
 				}),
+			RewardDestination::Account(dest_account) => {
+				Some(T::Currency::deposit_creating(&dest_account, amount))
+			}
 		}
 	}