Grcov report - lib.rs

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// Copyright (C) Moondance Labs Ltd.

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// This file is part of Tanssi.

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// Tanssi is free software: you can redistribute it and/or modify

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// it under the terms of the GNU General Public License as published by

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// the Free Software Foundation, either version 3 of the License, or

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// (at your option) any later version.

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// Tanssi is distributed in the hope that it will be useful,

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// but WITHOUT ANY WARRANTY; without even the implied warranty of

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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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// GNU General Public License for more details.

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// You should have received a copy of the GNU General Public License

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// along with Tanssi.  If not, see <http://www.gnu.org/licenses/>

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//! # Services Payment pallet

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//!

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//! This pallet allows for block creation services to be paid for by a

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//! containerChain.

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#![cfg_attr(not(feature = "std"), no_std)]

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use {

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    cumulus_primitives_core::ParaId,

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    frame_support::{

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        pallet_prelude::*,

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        sp_runtime::{traits::Zero, Saturating},

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        traits::{

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            tokens::ExistenceRequirement, Currency, EnsureOriginWithArg, OnUnbalanced,

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            WithdrawReasons,

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},

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},

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    frame_system::pallet_prelude::*,

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    scale_info::prelude::vec::Vec,

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    serde::{Deserialize, Serialize},

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    sp_io::hashing::blake2_256,

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    sp_runtime::{traits::TrailingZeroInput, DispatchError},

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    tp_traits::{AuthorNotingHook, BlockNumber, CollatorAssignmentHook, CollatorAssignmentTip},

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};

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#[cfg(any(test, feature = "runtime-benchmarks"))]

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mod benchmarks;

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#[cfg(test)]

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mod mock;

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#[cfg(test)]

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mod tests;

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pub mod weights;

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pub use weights::WeightInfo;

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pub use pallet::*;

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1086

#[frame_support::pallet]

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pub mod pallet {

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    use super::*;

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    #[pallet::config]

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    pub trait Config: frame_system::Config {

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        /// The overarching event type.

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        type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;

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        /// Handlers for fees

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        type OnChargeForBlock: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        type OnChargeForCollatorAssignment: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        type OnChargeForCollatorAssignmentTip: OnUnbalanced<NegativeImbalanceOf<Self>>;

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        /// Currency type for fee payment

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        type Currency: Currency<Self::AccountId>;

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        /// Provider of a block cost which can adjust from block to block

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        type ProvideBlockProductionCost: ProvideBlockProductionCost<Self>;

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        /// Provider of a block cost which can adjust from block to block

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        type ProvideCollatorAssignmentCost: ProvideCollatorAssignmentCost<Self>;

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        /// The maximum number of block production credits that can be accumulated

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        #[pallet::constant]

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        type FreeBlockProductionCredits: Get<BlockNumberFor<Self>>;

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        /// The maximum number of collator assigment production credits that can be accumulated

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        #[pallet::constant]

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        type FreeCollatorAssignmentCredits: Get<u32>;

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        /// Owner of the container chain, can call some only-owner methods

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        type ManagerOrigin: EnsureOriginWithArg<Self::RuntimeOrigin, ParaId>;

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        type WeightInfo: WeightInfo;

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    #[pallet::error]

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    pub enum Error<T> {

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        InsufficientFundsToPurchaseCredits,

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        InsufficientCredits,

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        CreditPriceTooExpensive,

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515102

    #[pallet::pallet]

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    pub struct Pallet<T>(PhantomData<T>);

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    #[pallet::event]

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234

    #[pallet::generate_deposit(pub(super) fn deposit_event)]

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    pub enum Event<T: Config> {

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        CreditsPurchased {

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            para_id: ParaId,

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            payer: T::AccountId,

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            credit: BalanceOf<T>,

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},

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        BlockProductionCreditBurned {

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            para_id: ParaId,

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            credits_remaining: BlockNumberFor<T>,

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},

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        CollatorAssignmentCreditBurned {

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            para_id: ParaId,

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            credits_remaining: u32,

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},

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        CollatorAssignmentTipCollected {

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            para_id: ParaId,

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            payer: T::AccountId,

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            tip: BalanceOf<T>,

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},

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        BlockProductionCreditsSet {

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            para_id: ParaId,

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            credits: BlockNumberFor<T>,

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},

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        RefundAddressUpdated {

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            para_id: ParaId,

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            refund_address: Option<T::AccountId>,

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},

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        MaxCorePriceUpdated {

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            para_id: ParaId,

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            max_core_price: Option<u128>,

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},

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        CollatorAssignmentCreditsSet {

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            para_id: ParaId,

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            credits: u32,

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},

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    #[pallet::storage]

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    pub type BlockProductionCredits<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, BlockNumberFor<T>, OptionQuery>;

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    #[pallet::storage]

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    pub type CollatorAssignmentCredits<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, u32, OptionQuery>;

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    /// List of para ids that have already been given free credits

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    #[pallet::storage]

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    pub type GivenFreeCredits<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, (), OptionQuery>;

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    /// Refund address

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    #[pallet::storage]

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    pub type RefundAddress<T: Config> =

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        StorageMap<_, Blake2_128Concat, ParaId, T::AccountId, OptionQuery>;

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    /// Max core price for parathread in relay chain currency

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    #[pallet::storage]

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    pub type MaxCorePrice<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, u128, OptionQuery>;

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    /// Max tip for collator assignment on congestion

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    #[pallet::storage]

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    pub type MaxTip<T: Config> = StorageMap<_, Blake2_128Concat, ParaId, BalanceOf<T>, OptionQuery>;

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6009

    #[pallet::call]

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    impl<T: Config> Pallet<T>

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    where

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        BlockNumberFor<T>: Into<BalanceOf<T>>,

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        #[pallet::call_index(0)]

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        #[pallet::weight(T::WeightInfo::purchase_credits())]

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        pub fn purchase_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            credit: BalanceOf<T>,

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        ) -> DispatchResultWithPostInfo {

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            let account = ensure_signed(origin)?;

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            let parachain_tank = Self::parachain_tank(para_id);

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            T::Currency::transfer(

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                &account,

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                &parachain_tank,

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                credit,

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                ExistenceRequirement::KeepAlive,

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)?;

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            Self::deposit_event(Event::<T>::CreditsPurchased {

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                para_id,

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                payer: account,

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                credit,

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});

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            Ok(().into())

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        /// Set the number of block production credits for this para_id without paying for them.

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        /// Can only be called by root.

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        #[pallet::call_index(1)]

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        #[pallet::weight(T::WeightInfo::set_block_production_credits())]

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        pub fn set_block_production_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            free_block_credits: BlockNumberFor<T>,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            Self::set_free_block_production_credits(&para_id, free_block_credits);

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            Ok(().into())

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        /// Helper to set and cleanup the `GivenFreeCredits` storage.

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        /// Can only be called by root.

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        #[pallet::call_index(2)]

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        #[pallet::weight(T::WeightInfo::set_given_free_credits())]

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        pub fn set_given_free_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            given_free_credits: bool,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            if given_free_credits {

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                GivenFreeCredits::<T>::insert(para_id, ());

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            } else {

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                GivenFreeCredits::<T>::remove(para_id);

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            Ok(().into())

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        /// Call index to set the refund address for non-spent tokens

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        #[pallet::call_index(3)]

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        #[pallet::weight(T::WeightInfo::set_refund_address())]

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        pub fn set_refund_address(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            refund_address: Option<T::AccountId>,

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        ) -> DispatchResultWithPostInfo {

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            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            if let Some(refund_address) = refund_address.clone() {

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                RefundAddress::<T>::insert(para_id, refund_address.clone());

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            } else {

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                RefundAddress::<T>::remove(para_id);

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            Self::deposit_event(Event::<T>::RefundAddressUpdated {

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                para_id,

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                refund_address,

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});

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            Ok(().into())

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        /// Set the number of block production credits for this para_id without paying for them.

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        /// Can only be called by root.

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        #[pallet::call_index(4)]

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        #[pallet::weight(T::WeightInfo::set_block_production_credits())]

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        pub fn set_collator_assignment_credits(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            free_collator_assignment_credits: u32,

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        ) -> DispatchResultWithPostInfo {

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            ensure_root(origin)?;

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            Self::set_free_collator_assignment_credits(&para_id, free_collator_assignment_credits);

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            Ok(().into())

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        /// Max core price for parathread in relay chain currency

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        #[pallet::call_index(5)]

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        #[pallet::weight(T::WeightInfo::set_max_core_price())]

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        pub fn set_max_core_price(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            max_core_price: Option<u128>,

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        ) -> DispatchResultWithPostInfo {

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            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            if let Some(max_core_price) = max_core_price {

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                MaxCorePrice::<T>::insert(para_id, max_core_price);

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            } else {

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                MaxCorePrice::<T>::remove(para_id);

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            Self::deposit_event(Event::<T>::MaxCorePriceUpdated {

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                para_id,

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                max_core_price,

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});

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            Ok(().into())

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        /// Set the maximum tip a container chain is willing to pay to be assigned a collator on congestion.

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        /// Can only be called by container chain manager.

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        #[pallet::call_index(6)]

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        #[pallet::weight(T::WeightInfo::set_max_tip())]

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        pub fn set_max_tip(

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            origin: OriginFor<T>,

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            para_id: ParaId,

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            max_tip: Option<BalanceOf<T>>,

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90

        ) -> DispatchResultWithPostInfo {

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90

            T::ManagerOrigin::ensure_origin(origin, &para_id)?;

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            if let Some(max_tip) = max_tip {

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                MaxTip::<T>::insert(para_id, max_tip);

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            } else {

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                MaxTip::<T>::remove(para_id);

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            Ok(().into())

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    impl<T: Config> Pallet<T> {

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        /// Burn a credit for the given para. Deducts one credit if possible, errors otherwise.

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        pub fn burn_block_production_free_credit_for_para(

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            para_id: &ParaId,

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        ) -> DispatchResultWithPostInfo {

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            let existing_credits =

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                BlockProductionCredits::<T>::get(para_id).unwrap_or(BlockNumberFor::<T>::zero());

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            ensure!(

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                existing_credits >= 1u32.into(),

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                Error::<T>::InsufficientCredits,

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);

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            let updated_credits = existing_credits.saturating_sub(1u32.into());

326

            BlockProductionCredits::<T>::insert(para_id, updated_credits);

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            Self::deposit_event(Event::<T>::BlockProductionCreditBurned {

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                para_id: *para_id,

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                credits_remaining: updated_credits,

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});

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            Ok(().into())

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        /// Burn a credit for the given para. Deducts one credit if possible, errors otherwise.

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        pub fn burn_collator_assignment_free_credit_for_para(

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            para_id: &ParaId,

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        ) -> DispatchResultWithPostInfo {

340

            let existing_credits = CollatorAssignmentCredits::<T>::get(para_id).unwrap_or(0u32);

341

342

            ensure!(existing_credits >= 1u32, Error::<T>::InsufficientCredits,);

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            let updated_credits = existing_credits.saturating_sub(1u32);

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            CollatorAssignmentCredits::<T>::insert(para_id, updated_credits);

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            Self::deposit_event(Event::<T>::CollatorAssignmentCreditBurned {

348

                para_id: *para_id,

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                credits_remaining: updated_credits,

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});

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352

            Ok(().into())

353

354

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        pub fn give_free_credits(para_id: &ParaId) -> Weight {

356

            if GivenFreeCredits::<T>::contains_key(para_id) {

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                // This para id has already received free credits

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                return Weight::default();

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            // Set number of credits to FreeBlockProductionCredits

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            let block_production_existing_credits =

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                BlockProductionCredits::<T>::get(para_id).unwrap_or(BlockNumberFor::<T>::zero());

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            let block_production_updated_credits = T::FreeBlockProductionCredits::get();

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            // Do not update credits if for some reason this para id had more

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            if block_production_existing_credits < block_production_updated_credits {

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                Self::set_free_block_production_credits(para_id, block_production_updated_credits);

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            // Set number of credits to FreeCollatorAssignmentCredits

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            let collator_assignment_existing_credits =

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                CollatorAssignmentCredits::<T>::get(para_id).unwrap_or(0u32);

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            let collator_assignment_updated_credits = T::FreeCollatorAssignmentCredits::get();

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375

            // Do not update credits if for some reason this para id had more

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            if collator_assignment_existing_credits < collator_assignment_updated_credits {

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                Self::set_free_collator_assignment_credits(

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                    para_id,

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                    collator_assignment_updated_credits,

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);

381

382

383

            // We only allow to call this function once per para id, even if it didn't actually

384

            // receive all the free credits

385

            GivenFreeCredits::<T>::insert(para_id, ());

386

387

            Weight::default()

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389

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        pub fn set_free_collator_assignment_credits(

391

            para_id: &ParaId,

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            free_collator_assignment_credits: u32,

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) {

394

            if free_collator_assignment_credits.is_zero() {

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                CollatorAssignmentCredits::<T>::remove(para_id);

396

            } else {

397

                CollatorAssignmentCredits::<T>::insert(para_id, free_collator_assignment_credits);

398

399

400

            Self::deposit_event(Event::<T>::CollatorAssignmentCreditsSet {

401

                para_id: *para_id,

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                credits: free_collator_assignment_credits,

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});

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405

406

        pub fn set_free_block_production_credits(

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            para_id: &ParaId,

408

            free_collator_block_production_credits: BlockNumberFor<T>,

409

) {

410

            if free_collator_block_production_credits.is_zero() {

411

                BlockProductionCredits::<T>::remove(para_id);

412

            } else {

413

                BlockProductionCredits::<T>::insert(

414

                    para_id,

415

                    free_collator_block_production_credits,

416

);

417

418

419

            Self::deposit_event(Event::<T>::BlockProductionCreditsSet {

420

                para_id: *para_id,

421

                credits: free_collator_block_production_credits,

422

});

423

424

425

        pub fn free_block_production_credits(para_id: ParaId) -> Option<BlockNumberFor<T>> {

426

            BlockProductionCredits::<T>::get(para_id)

427

428

429

        pub fn free_collator_assignment_credits(para_id: ParaId) -> Option<u32> {

430

            CollatorAssignmentCredits::<T>::get(para_id)

431

432

433

        pub fn given_free_credits(para_id: ParaId) -> Option<()> {

434

            GivenFreeCredits::<T>::get(para_id)

435

436

437

        pub fn refund_address(para_id: ParaId) -> Option<T::AccountId> {

438

            RefundAddress::<T>::get(para_id)

439

440

441

        pub fn max_tip(para_id: ParaId) -> Option<BalanceOf<T>> {

442

            MaxTip::<T>::get(para_id)

443

444

445

446

    #[pallet::genesis_config]

447

    pub struct GenesisConfig<T: Config> {

448

        pub para_id_credits: Vec<FreeCreditGenesisParams<BlockNumberFor<T>>>,

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450

451

    impl<T: Config> Default for GenesisConfig<T> {

452

        fn default() -> Self {

453

            Self {

454

                para_id_credits: Default::default(),

455

456

457

458

459

    #[pallet::genesis_build]

460

    impl<T: Config> BuildGenesisConfig for GenesisConfig<T> {

461

3

        fn build(&self) {

462

3

            for para_id_credits in &self.para_id_credits {

463

                BlockProductionCredits::<T>::insert(

464

                    para_id_credits.para_id,

465

                    para_id_credits.block_production_credits,

466

);

467

                CollatorAssignmentCredits::<T>::insert(

468

                    para_id_credits.para_id,

469

                    para_id_credits.collator_assignment_credits,

470

);

471

472

3

473

474

475

476

// Params to be set in genesis

477

#[derive(PartialEq, Eq, Clone, Encode, Decode, RuntimeDebug, TypeInfo, Serialize, Deserialize)]

478

pub struct FreeCreditGenesisParams<BlockProductCredits> {

479

    pub para_id: ParaId,

480

    pub block_production_credits: BlockProductCredits,

481

    pub collator_assignment_credits: u32,

482

483

impl<BlockProductCredits> From<(ParaId, BlockProductCredits, u32)>

484

    for FreeCreditGenesisParams<BlockProductCredits>

485

486

    fn from(value: (ParaId, BlockProductCredits, u32)) -> Self {

487

        Self {

488

            para_id: value.0,

489

            block_production_credits: value.1,

490

            collator_assignment_credits: value.2,

491

492

493

494

495

/// Balance used by this pallet

496

pub type BalanceOf<T> =

497

    <<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;

498

499

pub type CurrencyOf<T> = <T as Config>::Currency;

500

/// Type alias to conveniently refer to the `Currency::NegativeImbalance` associated type.

501

pub type NegativeImbalanceOf<T> =

502

    <CurrencyOf<T> as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance;

503

/// Handler for fee charging. This will be invoked when fees need to be deducted from the fee

504

/// account for a given paraId.

505

506

/// Returns the cost for a given block credit at the current time. This can be a complex operation,

507

/// so it also returns the weight it consumes. (TODO: or just rely on benchmarking)

508

pub trait ProvideBlockProductionCost<T: Config> {

509

    fn block_cost(para_id: &ParaId) -> (BalanceOf<T>, Weight);

510

511

512

/// Returns the cost for a given block credit at the current time. This can be a complex operation,

513

/// so it also returns the weight it consumes. (TODO: or just rely on benchmarking)

514

pub trait ProvideCollatorAssignmentCost<T: Config> {

515

    fn collator_assignment_cost(para_id: &ParaId) -> (BalanceOf<T>, Weight);

516

517

518

impl<T: Config> AuthorNotingHook<T::AccountId> for Pallet<T> {

519

    // This hook is called when pallet_author_noting sees that the block number of a container chain has increased.

520

    // Currently we always charge 1 credit, even if a container chain produced more that 1 block in between tanssi

521

    // blocks.

522

    fn on_container_author_noted(

523

        _author: &T::AccountId,

524

        _block_number: BlockNumber,

525

        para_id: ParaId,

526

    ) -> Weight {

527

        if Pallet::<T>::burn_block_production_free_credit_for_para(&para_id).is_err() {

528

            let (amount_to_charge, _weight) = T::ProvideBlockProductionCost::block_cost(&para_id);

529

            match T::Currency::withdraw(

530

                &Self::parachain_tank(para_id),

531

                amount_to_charge,

532

                WithdrawReasons::FEE,

533

                ExistenceRequirement::KeepAlive,

534

) {

535

                Err(e) => log::warn!(

536

                    "Failed to withdraw block production payment for container chain {}: {:?}",

537

                    u32::from(para_id),

538

539

),

540

                Ok(imbalance) => {

541

                    T::OnChargeForBlock::on_unbalanced(imbalance);

542

543

544

545

546

        T::WeightInfo::on_container_author_noted()

547

548

549

550

impl<T: Config> CollatorAssignmentHook<BalanceOf<T>> for Pallet<T> {

551

    // is_parathread parameter for future use to apply different logic

552

    fn on_collators_assigned(

553

        para_id: ParaId,

554

        maybe_tip: Option<&BalanceOf<T>>,

555

        _is_parathread: bool,

556

    ) -> Result<Weight, DispatchError> {

557

        // Withdraw assignment fee

558

        let maybe_assignment_imbalance =

559

            if Pallet::<T>::burn_collator_assignment_free_credit_for_para(&para_id).is_err() {

560

                let (amount_to_charge, _weight) =

561

                    T::ProvideCollatorAssignmentCost::collator_assignment_cost(&para_id);

562

                Some(T::Currency::withdraw(

563

                    &Self::parachain_tank(para_id),

564

                    amount_to_charge,

565

                    WithdrawReasons::FEE,

566

                    ExistenceRequirement::KeepAlive,

567

)?)

568

            } else {

569

                None

570

};

571

572

        if let Some(&tip) = maybe_tip {

573

            // Only charge the tip to the paras that had a max tip set

574

            // (aka were willing to tip for being assigned a collator)

575

            if MaxTip::<T>::get(para_id).is_some() {

576

                match T::Currency::withdraw(

577

                    &Self::parachain_tank(para_id),

578

                    tip,

579

                    WithdrawReasons::TIP,

580

                    ExistenceRequirement::KeepAlive,

581

) {

582

                    Err(e) => {

583

                        // Return assignment imbalance to tank on error

584

                        if let Some(assignment_imbalance) = maybe_assignment_imbalance {

585

                            T::Currency::resolve_creating(

586

                                &Self::parachain_tank(para_id),

587

                                assignment_imbalance,

588

);

589

590

                        return Err(e);

591

592

                    Ok(tip_imbalance) => {

593

                        Self::deposit_event(Event::<T>::CollatorAssignmentTipCollected {

594

                            para_id,

595

                            payer: Self::parachain_tank(para_id),

596

                            tip,

597

});

598

                        T::OnChargeForCollatorAssignmentTip::on_unbalanced(tip_imbalance);

599

600

601

602

603

604

        if let Some(assignment_imbalance) = maybe_assignment_imbalance {

605

            T::OnChargeForCollatorAssignment::on_unbalanced(assignment_imbalance);

606

607

608

        Ok(T::WeightInfo::on_collators_assigned())

609

610

611

612

impl<T: Config> CollatorAssignmentTip<BalanceOf<T>> for Pallet<T> {

613

    fn get_para_tip(para_id: ParaId) -> Option<BalanceOf<T>> {

614

        MaxTip::<T>::get(para_id)

615

616

617

618

impl<T: Config> Pallet<T> {

619

    /// Derive a derivative account ID from the paraId.

620

696

    pub fn parachain_tank(para_id: ParaId) -> T::AccountId {

621

696

        let entropy = (b"modlpy/serpayment", para_id).using_encoded(blake2_256);

622

696

        Decode::decode(&mut TrailingZeroInput::new(entropy.as_ref()))

623

696

            .expect("infinite length input; no invalid inputs for type; qed")

624

696

625

626

    /// Hook to perform things on deregister

627

    pub fn para_deregistered(para_id: ParaId) {

628

        // Drain the para-id account from tokens

629

        let parachain_tank_balance = T::Currency::total_balance(&Self::parachain_tank(para_id));

630

        if !parachain_tank_balance.is_zero() {

631

            if let Ok(imbalance) = T::Currency::withdraw(

632

                &Self::parachain_tank(para_id),

633

                parachain_tank_balance,

634

                WithdrawReasons::FEE,

635

                ExistenceRequirement::AllowDeath,

636

) {

637

                if let Some(address) = RefundAddress::<T>::get(para_id) {

638

                    T::Currency::resolve_creating(&address, imbalance);

639

                } else {

640

                    // Burn for now, we might be able to pass something to do with this

641

                    drop(imbalance);

642

643

644

645

646

        // Clean refund addres

647

        RefundAddress::<T>::remove(para_id);

648

649

        // Clean credits

650

        BlockProductionCredits::<T>::remove(para_id);

651

        CollatorAssignmentCredits::<T>::remove(para_id);

652

        MaxTip::<T>::remove(para_id);

653

        MaxCorePrice::<T>::remove(para_id);

654

655