feat(democracy): fast-track referendum

crates/democracy/README.md

@@ -70,10 +70,12 @@ Preimage actions:
 
 #### Fast Track Origin
 
-This call can only be made by the `FastTrackOrigin`.
+These calls can only be made by the `FastTrackOrigin`.
 
 - `fast_track` - Schedules the current externally proposed proposal that
   is "majority-carries" to become a referendum immediately.
+- `fast_track_referendum` - Schedules an active referendum to end in `FastTrackVotingPeriod` 
+  blocks.
 
 #### Root
 

crates/democracy/src/lib.rs

@@ -67,6 +67,8 @@
 //!
 //! - `fast_track` - Schedules the current externally proposed proposal that is "majority-carries" to become a
 //!   referendum immediately.
+//! - `fast_track_referendum` - Schedules an active referendum to end in `FastTrackVotingPeriod`
+//!  blocks.
 //!
 //! #### Root
 //!
@@ -327,8 +329,10 @@ pub mod pallet {
         Tabled(PropIndex, BalanceOf<T>, Vec<T::AccountId>),
         /// A referendum has begun. \[ref_index, threshold\]
         Started(ReferendumIndex, VoteThreshold),
-        /// A referendum has been fast tracked. \[ref_index\]
+        /// A proposal has been fast tracked. \[ref_index\]
         FastTrack(ReferendumIndex),
+        /// A referendum has been fast tracked. \[ref_index\]
+        FastTrackReferendum(ReferendumIndex),
         /// A proposal has been approved by referendum. \[ref_index\]
         Passed(ReferendumIndex),
         /// A proposal has been rejected by referendum. \[ref_index\]
@@ -373,6 +377,9 @@ pub mod pallet {
         PreimageMissing,
         /// Vote given for invalid referendum
         ReferendumInvalid,
+        /// Fast tracking failed, because the referendum is
+        /// ending sooner than the fast track voting period.
+        ReferendumFastTrackFailed,
         /// Invalid preimage
         PreimageInvalid,
         /// No proposals waiting
@@ -538,6 +545,21 @@ pub mod pallet {
             Ok(())
         }
 
+        #[pallet::weight(T::WeightInfo::fast_track_referendum())]
+        pub fn fast_track_referendum(origin: OriginFor<T>, #[pallet::compact] ref_index: PropIndex) -> DispatchResult {
+            T::FastTrackOrigin::ensure_origin(origin)?;
+            let mut status = Self::referendum_status(ref_index)?;
+            let now = <frame_system::Pallet<T>>::block_number();
+            let voting_period = T::FastTrackVotingPeriod::get();
+            let end_block = now.saturating_add(voting_period);
+            ensure!(status.end > end_block, Error::<T>::ReferendumFastTrackFailed);
+            status.end = end_block;
+
+            ReferendumInfoOf::<T>::insert(ref_index, ReferendumInfo::Ongoing(status));
+            Self::deposit_event(Event::<T>::FastTrackReferendum(ref_index));
+            Ok(())
+        }
+
         /// Remove a referendum.
         ///
         /// The dispatch origin of this call must be _Root_.

crates/democracy/src/tests/fast_tracking.rs

@@ -3,7 +3,7 @@
 use super::*;
 
 #[test]
-fn fast_track_referendum_works() {
+fn fast_track_works() {
     new_test_ext().execute_with(|| {
         System::set_block_number(0);
         // let h = set_balance_proposal_hash_and_note(2);
@@ -32,6 +32,63 @@ fn fast_track_referendum_works() {
     });
 }
 
+#[test]
+fn fast_track_referendum_works() {
+    new_test_ext().execute_with(|| {
+        System::set_block_number(0);
+        let fast_track_voting_period = <tests::Test as Config>::FastTrackVotingPeriod::get();
+        let ref_index = Democracy::inject_referendum(
+            fast_track_voting_period * 2,
+            set_balance_proposal_hash(2),
+            VoteThreshold::SuperMajorityAgainst,
+            0,
+        );
+
+        assert_noop!(
+            Democracy::fast_track_referendum(Origin::signed(1), ref_index),
+            BadOrigin
+        );
+        assert_ok!(Democracy::fast_track_referendum(Origin::signed(5), ref_index));
+
+        let start_height = System::block_number();
+        let end_height = start_height + fast_track_voting_period;
+        assert_eq!(
+            Democracy::referendum_status(ref_index),
+            Ok(ReferendumStatus {
+                end: end_height,
+                proposal_hash: set_balance_proposal_hash_and_note(2),
+                threshold: VoteThreshold::SuperMajorityAgainst,
+                delay: 0,
+                tally: Tally {
+                    ayes: 0,
+                    nays: 0,
+                    turnout: 0
+                },
+            })
+        );
+    });
+}
+
+#[test]
+fn fast_track_referendum_fails() {
+    new_test_ext().execute_with(|| {
+        System::set_block_number(0);
+        let fast_track_voting_period = <tests::Test as Config>::FastTrackVotingPeriod::get();
+        let ref_index = Democracy::inject_referendum(
+            fast_track_voting_period - 1,
+            set_balance_proposal_hash(2),
+            VoteThreshold::SuperMajorityAgainst,
+            0,
+        );
+
+        // Fails because the referendum ends too soon
+        assert_noop!(
+            Democracy::fast_track_referendum(Origin::signed(5), ref_index),
+            Error::<Test>::ReferendumFastTrackFailed
+        );
+    });
+}
+
 // #[test]
 // fn instant_referendum_works() {
 //     new_test_ext().execute_with(|| {

crates/democracy/src/weights.rs

@@ -38,6 +38,7 @@ pub trait WeightInfo {
 	fn external_propose_majority() -> Weight;
 	fn external_propose_default() -> Weight;
 	fn fast_track() -> Weight;
+	fn fast_track_referendum() -> Weight;
 	fn veto_external(v: u32, ) -> Weight;
 	fn cancel_proposal(p: u32, ) -> Weight;
 	fn cancel_referendum() -> Weight;
@@ -143,6 +144,12 @@ impl<T: frame_system::Config> WeightInfo for SubstrateWeight<T> {
 			.saturating_add(T::DbWeight::get().reads(2 as Weight))
 			.saturating_add(T::DbWeight::get().writes(3 as Weight))
 	}
+	// Storage: Democracy ReferendumInfoOf (r:1 w:1)
+	fn fast_track_referendum() -> Weight {
+		(29_129_000 as Weight)
+			.saturating_add(T::DbWeight::get().reads(1 as Weight))
+			.saturating_add(T::DbWeight::get().writes(1 as Weight))
+	}
 	// Storage: Democracy NextExternal (r:1 w:1)
 	// Storage: Democracy Blacklist (r:1 w:1)
 	fn veto_external(v: u32, ) -> Weight {
@@ -378,6 +385,12 @@ impl WeightInfo for () {
 			.saturating_add(RocksDbWeight::get().reads(2 as Weight))
 			.saturating_add(RocksDbWeight::get().writes(3 as Weight))
 	}
+	// Storage: Democracy ReferendumInfoOf (r:1 w:1)
+	fn fast_track_referendum() -> Weight {
+		(29_129_000 as Weight)
+			.saturating_add(RocksDbWeight::get().reads(1 as Weight))
+			.saturating_add(RocksDbWeight::get().writes(1 as Weight))
+	}
 	// Storage: Democracy NextExternal (r:1 w:1)
 	// Storage: Democracy Blacklist (r:1 w:1)
 	fn veto_external(v: u32, ) -> Weight {

standalone/runtime/tests/test_governance.rs

@@ -2,7 +2,7 @@ mod mock;
 use crate::assert_eq;
 use mock::*;
 
-use democracy::{PropIndex, ReferendumIndex, ReferendumInfo, Vote};
+use democracy::{PropIndex, ReferendumIndex, ReferendumInfo, ReferendumStatus, Tally, Vote, VoteThreshold};
 use frame_support::traits::{Currency, Hooks};
 use orml_vesting::VestingSchedule;
 use sp_core::{Encode, Hasher};
@@ -116,7 +116,7 @@ fn assert_technical_committee_executed_event() {
         .expect("execution failed");
 }
 
-fn create_proposal(encoded_proposal: Vec<u8>) {
+fn create_proposal(encoded_proposal: Vec<u8>) -> H256 {
     let proposal_hash = BlakeTwo256::hash(&encoded_proposal[..]);
 
     assert_ok!(
@@ -128,9 +128,11 @@ fn create_proposal(encoded_proposal: Vec<u8>) {
         value: <Runtime as democracy::Config>::MinimumDeposit::get(),
     })
     .dispatch(origin_of(account_of(ALICE))));
+
+    proposal_hash
 }
 
-fn create_set_balance_proposal(amount_to_set: Balance) {
+fn create_set_balance_proposal(amount_to_set: Balance) -> H256 {
     create_proposal(set_balance_proposal(account_of(EVE), amount_to_set))
 }
 
@@ -395,6 +397,48 @@ fn integration_test_governance_voter_can_change_vote() {
     });
 }
 
+#[test]
+fn integration_test_fast_track_referendum() {
+    test_with(|| {
+        let amount_to_set = 1000;
+        let proposal_hash = create_set_balance_proposal(amount_to_set);
+
+        let start_height = <Runtime as democracy::Config>::LaunchPeriod::get();
+        DemocracyPallet::on_initialize(start_height);
+        let index = assert_democracy_started_event();
+
+        // create motion to fast-track simple-majority referendum
+        assert_ok!(Call::TechnicalCommittee(TechnicalCommitteeCall::propose {
+            threshold: 1, // member count
+            proposal: Box::new(Call::Democracy(DemocracyCall::fast_track_referendum {
+                ref_index: index,
+            })),
+            length_bound: 100000 // length bound
+        })
+        .dispatch(origin_of(account_of(ALICE))));
+        // should be executed immediately with only one member
+        assert_technical_committee_executed_event();
+
+        let now = SystemPallet::block_number();
+        let fast_track_voting_period = <Runtime as democracy::Config>::FastTrackVotingPeriod::get();
+        let end = now + fast_track_voting_period;
+        assert_eq!(
+            DemocracyPallet::referendum_info(index),
+            Some(ReferendumInfo::Ongoing(ReferendumStatus {
+                end,
+                proposal_hash,
+                threshold: VoteThreshold::SuperMajorityAgainst,
+                delay: <Runtime as democracy::Config>::EnactmentPeriod::get(),
+                tally: Tally {
+                    ayes: 0,
+                    nays: 0,
+                    turnout: 0
+                },
+            }))
+        );
+    });
+}
+
 #[test]
 fn integration_test_governance_voter_can_change_vote_with_limited_funds() {
     test_with(|| {