async backing migrations

Cargo.toml

@@ -297,6 +297,7 @@ astar-xcm-benchmarks = { path = "./pallets/astar-xcm-benchmarks", default-featur
 pallet-static-price-provider = { path = "./pallets/static-price-provider", default-features = false }
 pallet-price-aggregator = { path = "./pallets/price-aggregator", default-features = false }
 pallet-collective-proxy = { path = "./pallets/collective-proxy", default-features = false }
+vesting-mbm = { path = "./pallets/vesting-mbm", default-features = false }
 
 dapp-staking-runtime-api = { path = "./pallets/dapp-staking/rpc/runtime-api", default-features = false }
 

pallets/dapp-staking/Cargo.toml

@@ -29,6 +29,7 @@ frame-benchmarking = { workspace = true, optional = true }
 
 [dev-dependencies]
 pallet-balances = { workspace = true }
+pallet-migrations = { workspace = true }
 
 [features]
 default = ["std"]

pallets/dapp-staking/src/benchmarking/mod.rs

@@ -21,7 +21,7 @@ use super::{Pallet as DappStaking, *};
 use astar_primitives::Balance;
 use frame_benchmarking::v2::*;
 
-use frame_support::assert_ok;
+use frame_support::{assert_ok, migrations::SteppedMigration, weights::WeightMeter};
 use frame_system::{Pallet as System, RawOrigin};
 use sp_std::prelude::*;
 
@@ -1070,6 +1070,73 @@ mod benchmarks {
         );
     }
 
+    /// Benchmark a single step of mbm migration.
+    #[benchmark]
+    fn step() {
+        let alice: T::AccountId = account("alice", 0, 1);
+
+        Ledger::<T>::set(
+            &alice,
+            AccountLedger {
+                locked: 1000,
+                unlocking: vec![
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 5,
+                    },
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 20,
+                    },
+                ]
+                .try_into()
+                .unwrap(),
+                staked: Default::default(),
+                staked_future: None,
+                contract_stake_count: 0,
+            },
+        );
+        CurrentEraInfo::<T>::put(EraInfo {
+            total_locked: 1000,
+            unlocking: 200,
+            current_stake_amount: Default::default(),
+            next_stake_amount: Default::default(),
+        });
+
+        System::<T>::set_block_number(10u32.into());
+        let mut meter = WeightMeter::new();
+
+        #[block]
+        {
+            crate::migration::LazyMigration::<T, weights::SubstrateWeight<T>>::step(
+                None, &mut meter,
+            )
+            .unwrap();
+        }
+
+        assert_eq!(
+            Ledger::<T>::get(&alice),
+            AccountLedger {
+                locked: 1000,
+                unlocking: vec![
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 5, // already unlocked
+                    },
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 30, // double remaining blocks
+                    },
+                ]
+                .try_into()
+                .unwrap(),
+                staked: Default::default(),
+                staked_future: None,
+                contract_stake_count: 0,
+            }
+        );
+    }
+
     impl_benchmark_test_suite!(
         Pallet,
         crate::benchmarking::tests::new_test_ext(),

pallets/dapp-staking/src/migration.rs

@@ -17,7 +17,12 @@
 // along with Astar. If not, see <http://www.gnu.org/licenses/>.
 
 use super::*;
-use frame_support::{storage_alias, traits::UncheckedOnRuntimeUpgrade};
+use frame_support::{
+    migrations::{MigrationId, SteppedMigration, SteppedMigrationError},
+    storage_alias,
+    traits::UncheckedOnRuntimeUpgrade,
+    weights::WeightMeter,
+};
 
 #[cfg(feature = "try-runtime")]
 use sp_std::vec::Vec;
@@ -412,3 +417,88 @@ pub mod v6 {
         pub period: PeriodNumber,
     }
 }
+
+const PALLET_MIGRATIONS_ID: &[u8; 16] = b"dapp-staking-mbm";
+
+pub struct LazyMigration<T, W: WeightInfo>(PhantomData<(T, W)>);
+
+impl<T: Config, W: WeightInfo> SteppedMigration for LazyMigration<T, W> {
+    type Cursor = <T as frame_system::Config>::AccountId;
+    // Without the explicit length here the construction of the ID would not be infallible.
+    type Identifier = MigrationId<16>;
+
+    /// The identifier of this migration. Which should be globally unique.
+    fn id() -> Self::Identifier {
+        MigrationId {
+            pallet_id: *PALLET_MIGRATIONS_ID,
+            version_from: 0,
+            version_to: 1,
+        }
+    }
+
+    fn step(
+        mut cursor: Option<Self::Cursor>,
+        meter: &mut WeightMeter,
+    ) -> Result<Option<Self::Cursor>, SteppedMigrationError> {
+        let required = W::step();
+        // If there is not enough weight for a single step, return an error. This case can be
+        // problematic if it is the first migration that ran in this block. But there is nothing
+        // that we can do about it here.
+        if meter.remaining().any_lt(required) {
+            return Err(SteppedMigrationError::InsufficientWeight { required });
+        }
+
+        let mut count = 0u32;
+        let current_block_number =
+            frame_system::Pallet::<T>::block_number().saturated_into::<u32>();
+
+        // We loop here to do as much progress as possible per step.
+        loop {
+            if meter.try_consume(required).is_err() {
+                break;
+            }
+
+            let mut iter = if let Some(last_key) = cursor {
+                // If a cursor is provided, start iterating from the stored value
+                // corresponding to the last key processed in the previous step.
+                // Note that this only works if the old and the new map use the same way to hash
+                // storage keys.
+                Ledger::<T>::iter_from(Ledger::<T>::hashed_key_for(last_key))
+            } else {
+                // If no cursor is provided, start iterating from the beginning.
+                Ledger::<T>::iter()
+            };
+
+            // If there's a next item in the iterator, perform the migration.
+            if let Some((ref last_key, mut ledger)) = iter.next() {
+                if ledger.unlocking.is_empty() {
+                    // no unlocking for this account, nothing to update
+                    cursor = Some(last_key.clone()); // Return the processed key as the new cursor.
+                    continue;
+                }
+                for chunk in ledger.unlocking.iter_mut() {
+                    if current_block_number >= chunk.unlock_block {
+                        continue; // chunk already unlocked
+                    }
+                    let remaining_blocks = chunk.unlock_block.saturating_sub(current_block_number);
+                    chunk.unlock_block.saturating_accrue(remaining_blocks);
+                }
+
+                // Override ledger
+                Ledger::<T>::insert(last_key, ledger);
+
+                // inc counter
+                count.saturating_inc();
+
+                // Return the processed key as the new cursor.
+                cursor = Some(last_key.clone())
+            } else {
+                // Signal that the migration is complete (no more items to process).
+                cursor = None;
+                break;
+            }
+        }
+        log::debug!(target: LOG_TARGET, "migrated {count:?} entries");
+        Ok(cursor)
+    }
+}

pallets/dapp-staking/src/test/migrations.rs

@@ -0,0 +1,85 @@
+// This file is part of Astar.
+
+// Copyright (C) Stake Technologies Pte.Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// Astar is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Astar is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Astar. If not, see <http://www.gnu.org/licenses/>.
+
+#![cfg(all(test, not(feature = "runtime-benchmarks")))]
+
+use crate::test::mock::*;
+use crate::{AccountLedger, CurrentEraInfo, EraInfo, Ledger, UnlockingChunk};
+use frame_support::traits::OnRuntimeUpgrade;
+
+#[test]
+fn lazy_migrations() {
+    ExtBuilder::default().build_and_execute(|| {
+        Ledger::<Test>::set(
+            &1,
+            AccountLedger {
+                locked: 1000,
+                unlocking: vec![
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 5,
+                    },
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 20,
+                    },
+                ]
+                .try_into()
+                .unwrap(),
+                staked: Default::default(),
+                staked_future: None,
+                contract_stake_count: 0,
+            },
+        );
+        CurrentEraInfo::<Test>::put(EraInfo {
+            total_locked: 1000,
+            unlocking: 200,
+            current_stake_amount: Default::default(),
+            next_stake_amount: Default::default(),
+        });
+
+        // go to block before migration
+        run_to_block(9);
+
+        // onboard MBMs
+        AllPalletsWithSystem::on_runtime_upgrade();
+        run_to_block(10);
+
+        assert_eq!(
+            Ledger::<Test>::get(&1),
+            AccountLedger {
+                locked: 1000,
+                unlocking: vec![
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 5, // already unlocked
+                    },
+                    UnlockingChunk {
+                        amount: 100,
+                        unlock_block: 30, // double remaining blocks
+                    },
+                ]
+                .try_into()
+                .unwrap(),
+                staked: Default::default(),
+                staked_future: None,
+                contract_stake_count: 0,
+            }
+        );
+    })
+}