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// Copyright 2017-2020 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.
// Polkadot 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.
// Polkadot 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 Polkadot. If not, see <http://www.gnu.org/licenses/>.
//! Pallet to handle parathread/parachain registration and related fund management.
//! In essence this is a simple wrapper around `paras`.
use frame_support::{
dispatch::DispatchResult,
};
use frame_system::{self, ensure_root, ensure_signed};
use primitives::{HeadData, Id as ParaId, ValidationCode, LOWEST_PUBLIC_ID};
configuration, ensure_parachain,
paras::{self, ParaGenesisArgs},
pub use pallet::*;
use runtime_parachains::paras::ParaKind;
use scale_info::TypeInfo;
use sp_runtime::{
traits::{CheckedSub, Saturating},
RuntimeDebug,
};
#[derive(Encode, Decode, Clone, PartialEq, Eq, Default, RuntimeDebug, TypeInfo)]
pub struct ParaInfo<Account, Balance> {
/// The account that has placed a deposit for registering this para.
/// The amount reserved by the `manager` account for the registration.
/// Whether the para registration should be locked from being controlled by the manager.
locked: bool,
<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;
fn force_register() -> Weight;
fn deregister() -> Weight;
fn swap() -> Weight;
fn schedule_code_upgrade(b: u32) -> Weight;
fn set_current_head(b: u32) -> Weight;
}
pub struct TestWeightInfo;
impl WeightInfo for TestWeightInfo {
fn schedule_code_upgrade(_b: u32) -> Weight {
Weight::zero()
}
fn set_current_head(_b: u32) -> Weight {
Weight::zero()
}
#[frame_support::pallet]
pub mod pallet {
use frame_support::pallet_prelude::*;
use frame_system::pallet_prelude::*;
#[pallet::pallet]
#[pallet::without_storage_info]
pub struct Pallet<T>(_);
#[pallet::config]
#[pallet::disable_frame_system_supertrait_check]
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pub trait Config: configuration::Config + paras::Config {
/// The overarching event type.
type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
/// The aggregated origin type must support the `parachains` origin. We require that we can
/// infallibly convert between this origin and the system origin, but in reality, they're the
/// same type, we just can't express that to the Rust type system without writing a `where`
/// clause everywhere.
type RuntimeOrigin: From<<Self as frame_system::Config>::RuntimeOrigin>
+ Into<result::Result<Origin, <Self as Config>::RuntimeOrigin>>;
/// The system's currency for parathread payment.
type Currency: ReservableCurrency<Self::AccountId>;
/// Runtime hook for when a parachain and parathread swap.
type OnSwap: crate::traits::OnSwap;
/// The deposit to be paid to run a parathread.
/// This should include the cost for storing the genesis head and validation code.
#[pallet::constant]
type ParaDeposit: Get<BalanceOf<Self>>;
/// The deposit to be paid per byte stored on chain.
#[pallet::constant]
type DataDepositPerByte: Get<BalanceOf<Self>>;
/// Weight Information for the Extrinsics in the Pallet
type WeightInfo: WeightInfo;
#[pallet::event]
#[pallet::generate_deposit(pub(super) fn deposit_event)]
pub enum Event<T: Config> {
Registered { para_id: ParaId, manager: T::AccountId },
Deregistered { para_id: ParaId },
Reserved { para_id: ParaId, who: T::AccountId },
#[pallet::error]
pub enum Error<T> {
/// The ID is not registered.
NotRegistered,
/// The ID is already registered.
AlreadyRegistered,
/// The caller is not the owner of this Id.
NotOwner,
/// Invalid para code size.
CodeTooLarge,
/// Invalid para head data size.
HeadDataTooLarge,
/// Para is not a Parachain.
NotParachain,
/// Para is not a Parathread.
NotParathread,
/// Cannot deregister para
CannotDeregister,
/// Cannot schedule downgrade of parachain to parathread
CannotDowngrade,
/// Cannot schedule upgrade of parathread to parachain
CannotUpgrade,
/// Para is locked from manipulation by the manager. Must use parachain or relay chain governance.
ParaLocked,
/// The ID given for registration has not been reserved.
NotReserved,
/// Registering parachain with empty code is not allowed.
EmptyCode,
/// Cannot perform a parachain slot / lifecycle swap. Check that the state of both paras are
/// correct for the swap to work.
CannotSwap,
/// Pending swap operations.
#[pallet::storage]
pub(super) type PendingSwap<T> = StorageMap<_, Twox64Concat, ParaId, ParaId>;
/// Amount held on deposit for each para and the original depositor.
///
/// The given account ID is responsible for registering the code and initial head data, but may only do
/// so if it isn't yet registered. (After that, it's up to governance to do so.)
#[pallet::storage]
pub type Paras<T: Config> =
StorageMap<_, Twox64Concat, ParaId, ParaInfo<T::AccountId, BalanceOf<T>>>;
/// The next free `ParaId`.
#[pallet::storage]
pub type NextFreeParaId<T> = StorageValue<_, ParaId, ValueQuery>;
#[pallet::genesis_config]
pub struct GenesisConfig {
pub next_free_para_id: ParaId,
}
#[cfg(feature = "std")]
impl Default for GenesisConfig {
fn default() -> Self {
GenesisConfig { next_free_para_id: LOWEST_PUBLIC_ID }
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