Pallet inflation

Cargo.toml

@@ -279,6 +279,7 @@ pallet-xc-asset-config = { path = "./pallets/xc-asset-config", default-features
 pallet-xvm = { path = "./pallets/xvm", default-features = false }
 pallet-xcm = { path = "./pallets/pallet-xcm", default-features = false }
 pallet-ethereum-checked = { path = "./pallets/ethereum-checked", default-features = false }
+pallet-inflation = { path = "./pallets/inflation", default-features = false }
 
 astar-primitives = { path = "./primitives", default-features = false }
 

bin/collator/src/local/chain_spec.rs

@@ -21,8 +21,8 @@
 use local_runtime::{
     wasm_binary_unwrap, AccountId, AuraConfig, AuraId, BalancesConfig, BaseFeeConfig,
     BlockRewardConfig, CouncilConfig, DappStakingConfig, DemocracyConfig, EVMConfig, GenesisConfig,
-    GrandpaConfig, GrandpaId, Precompiles, Signature, SudoConfig, SystemConfig,
-    TechnicalCommitteeConfig, TreasuryConfig, VestingConfig, AST,
+    GrandpaConfig, GrandpaId, InflationConfig, InflationParameters, Precompiles, Signature,
+    SudoConfig, SystemConfig, TechnicalCommitteeConfig, TreasuryConfig, VestingConfig, AST,
 };
 use sc_service::ChainType;
 use sp_core::{crypto::Ss58Codec, sr25519, Pair, Public};
@@ -213,6 +213,9 @@ fn testnet_genesis(
             ],
             slots_per_tier: vec![10, 20, 30, 40],
         },
+        inflation: InflationConfig {
+            params: InflationParameters::default(),
+        },
     }
 }
 

pallets/inflation/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+name = "pallet-inflation"
+version = "0.1.0"
+license = "GPL-3.0-or-later"
+description = "Manages inflation rate & inflation distribution"
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+repository.workspace = true
+
+[dependencies]
+log = { workspace = true }
+parity-scale-codec = { workspace = true }
+serde = { workspace = true }
+
+astar-primitives = { workspace = true }
+frame-support = { workspace = true }
+frame-system = { workspace = true }
+scale-info = { workspace = true }
+sp-runtime = { workspace = true }
+
+frame-benchmarking = { workspace = true, optional = true }
+
+[dev-dependencies]
+pallet-balances = { workspace = true }
+sp-core = { workspace = true }
+
+[features]
+default = ["std"]
+std = [
+	"parity-scale-codec/std",
+	"log/std",
+	"sp-core/std",
+	"scale-info/std",
+	"serde/std",
+	"frame-support/std",
+	"frame-system/std",
+	"pallet-balances/std",
+	"astar-primitives/std",
+]
+runtime-benchmarks = [
+	"frame-benchmarking",
+	"frame-support/runtime-benchmarks",
+	"frame-system/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+	"astar-primitives/runtime-benchmarks",
+]
+try-runtime = ["frame-support/try-runtime"]

pallets/inflation/src/benchmarking.rs

@@ -0,0 +1,168 @@
+// This file is part of Astar.
+
+// Copyright (C) 2019-2023 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/>.
+
+use super::*;
+
+use frame_benchmarking::v2::*;
+use frame_system::{Pallet as System, RawOrigin};
+
+/// Assert that the last event equals the provided one.
+fn assert_last_event<T: Config>(generic_event: <T as Config>::RuntimeEvent) {
+    System::<T>::assert_last_event(generic_event.into());
+}
+
+// Set up initial config in the database, so it's not empty.
+fn initial_config<T: Config>() {
+    // Some dummy inflation params
+    let params = InflationParameters {
+        max_inflation_rate: Perquintill::from_percent(7),
+        treasury_part: Perquintill::from_percent(5),
+        collators_part: Perquintill::from_percent(3),
+        dapps_part: Perquintill::from_percent(20),
+        base_stakers_part: Perquintill::from_percent(25),
+        adjustable_stakers_part: Perquintill::from_percent(35),
+        bonus_part: Perquintill::from_percent(12),
+        ideal_staking_rate: Perquintill::from_percent(50),
+    };
+    assert!(params.is_valid());
+
+    // Some dummy inflation config
+    let total_issuance = T::Currency::total_issuance();
+    let issuance_safety_cap =
+        total_issuance.saturating_add(params.max_inflation_rate * total_issuance);
+    let config = InflationConfiguration {
+        recalculation_block: 123,
+        issuance_safety_cap,
+        collator_reward_per_block: 11111,
+        treasury_reward_per_block: 33333,
+        dapp_reward_pool_per_era: 55555,
+        base_staker_reward_pool_per_era: 77777,
+        adjustable_staker_reward_pool_per_era: 99999,
+        bonus_reward_pool_per_period: 123987,
+        ideal_staking_rate: Perquintill::from_percent(50),
+    };
+
+    InflationParams::<T>::put(params);
+    ActiveInflationConfig::<T>::put(config);
+
+    // Create some issuance so it's not zero
+    let dummy_account = whitelisted_caller();
+    T::Currency::make_free_balance_be(&dummy_account, 1_000_000_000_000_000_000_000);
+}
+
+#[benchmarks]
+mod benchmarks {
+    use super::*;
+
+    #[benchmark]
+    fn force_set_inflation_params() {
+        initial_config::<T>();
+
+        let params = InflationParameters::default();
+        assert!(params.is_valid());
+
+        #[extrinsic_call]
+        _(RawOrigin::Root, params);
+
+        assert_last_event::<T>(Event::<T>::InflationParametersForceChanged.into());
+    }
+
+    #[benchmark]
+    fn force_set_inflation_config() {
+        initial_config::<T>();
+        let config = InflationConfiguration::default();
+
+        #[extrinsic_call]
+        _(RawOrigin::Root, config.clone());
+
+        assert_last_event::<T>(Event::<T>::InflationConfigurationForceChanged { config }.into());
+    }
+
+    #[benchmark]
+    fn force_inflation_recalculation() {
+        initial_config::<T>();
+
+        #[extrinsic_call]
+        _(RawOrigin::Root);
+
+        let config = ActiveInflationConfig::<T>::get();
+        assert_last_event::<T>(Event::<T>::ForcedInflationRecalculation { config }.into());
+    }
+
+    #[benchmark]
+    fn hook_with_recalculation() {
+        initial_config::<T>();
+
+        ActiveInflationConfig::<T>::mutate(|config| {
+            config.recalculation_block = 0;
+        });
+        let init_issuance = T::Currency::total_issuance();
+
+        let block = 1;
+        #[block]
+        {
+            Pallet::<T>::on_initialize(block);
+            Pallet::<T>::on_finalize(block);
+        }
+
+        assert!(ActiveInflationConfig::<T>::get().recalculation_block > 0);
+
+        // The 'sane' assumption is that at least something will be issued for treasury & collators
+        assert!(T::Currency::total_issuance() > init_issuance);
+    }
+
+    #[benchmark]
+    fn hook_without_recalculation() {
+        initial_config::<T>();
+
+        ActiveInflationConfig::<T>::mutate(|config| {
+            config.recalculation_block = 2;
+        });
+        let init_config = ActiveInflationConfig::<T>::get();
+        let init_issuance = T::Currency::total_issuance();
+
+        // Has to be at least 2 blocks less than the recalculation block.
+        let block = 0;
+        #[block]
+        {
+            Pallet::<T>::on_initialize(block);
+            Pallet::<T>::on_finalize(block);
+        }
+
+        assert_eq!(ActiveInflationConfig::<T>::get(), init_config);
+
+        // The 'sane' assumption is that at least something will be issued for treasury & collators
+        assert!(T::Currency::total_issuance() > init_issuance);
+    }
+
+    impl_benchmark_test_suite!(
+        Pallet,
+        crate::benchmarking::tests::new_test_ext(),
+        crate::mock::Test,
+    );
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::mock;
+    use frame_support::sp_io::TestExternalities;
+
+    pub fn new_test_ext() -> TestExternalities {
+        mock::ExternalityBuilder::build()
+    }
+}