westend_runtime_constants/
lib.rs

1// Copyright (C) Parity Technologies (UK) Ltd.
2// This file is part of Polkadot.
3
4// Polkadot is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8
9// Polkadot is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License
15// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
16
17#![cfg_attr(not(feature = "std"), no_std)]
18
19pub mod weights;
20
21/// Money matters.
22pub mod currency {
23	use polkadot_primitives::Balance;
24
25	/// The existential deposit.
26	pub const EXISTENTIAL_DEPOSIT: Balance = 1 * CENTS;
27
28	pub const UNITS: Balance = 1_000_000_000_000;
29	pub const CENTS: Balance = UNITS / 100;
30	pub const MILLICENTS: Balance = CENTS / 1_000;
31	pub const GRAND: Balance = CENTS * 100_000;
32
33	pub const fn deposit(items: u32, bytes: u32) -> Balance {
34		items as Balance * 100 * CENTS + (bytes as Balance) * 5 * MILLICENTS
35	}
36}
37
38/// Time and blocks.
39pub mod time {
40	use polkadot_primitives::{BlockNumber, Moment};
41	use polkadot_runtime_common::prod_or_fast;
42
43	pub const MILLISECS_PER_BLOCK: Moment = 6000;
44	pub const SLOT_DURATION: Moment = MILLISECS_PER_BLOCK;
45	pub const EPOCH_DURATION_IN_SLOTS: BlockNumber = prod_or_fast!(1 * HOURS, 1 * MINUTES);
46
47	// These time units are defined in number of blocks.
48	pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
49	pub const HOURS: BlockNumber = MINUTES * 60;
50	pub const DAYS: BlockNumber = HOURS * 24;
51
52	// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
53	// The choice of is done in accordance to the slot duration and expected target
54	// block time, for safely resisting network delays of maximum two seconds.
55	// <https://research.web3.foundation/Polkadot/protocols/block-production/Babe#6-practical-results>
56	pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
57}
58
59/// Fee-related.
60pub mod fee {
61	use crate::weights::ExtrinsicBaseWeight;
62	use frame_support::weights::{
63		WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial,
64	};
65	use polkadot_primitives::Balance;
66	use smallvec::smallvec;
67	pub use sp_runtime::Perbill;
68
69	/// The block saturation level. Fees will be updates based on this value.
70	pub const TARGET_BLOCK_FULLNESS: Perbill = Perbill::from_percent(25);
71
72	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
73	/// node's balance type.
74	///
75	/// This should typically create a mapping between the following ranges:
76	///   - [0,` MAXIMUM_BLOCK_WEIGHT`]
77	///   - [Balance::min, Balance::max]
78	///
79	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
80	///   - Setting it to `0` will essentially disable the weight fee.
81	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
82	pub struct WeightToFee;
83	impl WeightToFeePolynomial for WeightToFee {
84		type Balance = Balance;
85		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
86			// in Westend, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
87			let p = super::currency::CENTS;
88			let q = 10 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
89			smallvec![WeightToFeeCoefficient {
90				degree: 1,
91				negative: false,
92				coeff_frac: Perbill::from_rational(p % q, q),
93				coeff_integer: p / q,
94			}]
95		}
96	}
97}
98
99/// System Parachains.
100pub mod system_parachain {
101	use frame_support::parameter_types;
102	use polkadot_primitives::Id as ParaId;
103	use xcm_builder::IsChildSystemParachain;
104
105	parameter_types! {
106		pub AssetHubParaId: ParaId = ASSET_HUB_ID.into();
107		pub PeopleParaId: ParaId = PEOPLE_ID.into();
108	}
109
110	/// Network's Asset Hub parachain ID.
111	pub const ASSET_HUB_ID: u32 = 1000;
112	/// Collectives parachain ID.
113	pub const COLLECTIVES_ID: u32 = 1001;
114	/// BridgeHub parachain ID.
115	pub const BRIDGE_HUB_ID: u32 = 1002;
116	/// Encointer parachain ID.
117	pub const ENCOINTER_ID: u32 = 1003;
118	/// People Chain parachain ID.
119	pub const PEOPLE_ID: u32 = 1004;
120	/// Brokerage parachain ID.
121	pub const BROKER_ID: u32 = 1005;
122	/// AH-next - temporary AH clone.
123	pub const ASSET_HUB_NEXT_ID: u32 = 1100;
124
125	/// All system parachains of Westend.
126	pub type SystemParachains = IsChildSystemParachain<ParaId>;
127
128	/// Coretime constants
129	pub mod coretime {
130		/// Coretime timeslice period in blocks
131		/// WARNING: This constant is used accross chains, so additional care should be taken
132		/// when changing it.
133		#[cfg(feature = "fast-runtime")]
134		pub const TIMESLICE_PERIOD: u32 = 20;
135		#[cfg(not(feature = "fast-runtime"))]
136		pub const TIMESLICE_PERIOD: u32 = 80;
137	}
138}
139
140/// Westend Treasury pallet instance.
141pub const TREASURY_PALLET_ID: u8 = 37;
142
143/// XCM protocol related constants.
144pub mod xcm {
145	/// Pluralistic bodies existing within the consensus.
146	pub mod body {
147		// Preallocated for the Root body.
148		#[allow(dead_code)]
149		const ROOT_INDEX: u32 = 0;
150		// The bodies corresponding to the Polkadot OpenGov Origins.
151		pub const FELLOWSHIP_ADMIN_INDEX: u32 = 1;
152		#[deprecated = "Will be removed after August 2024; Use `xcm::latest::BodyId::Treasury` \
153			instead"]
154		pub const TREASURER_INDEX: u32 = 2;
155	}
156}
157
158#[cfg(test)]
159mod tests {
160	use super::{
161		currency::{CENTS, MILLICENTS, UNITS},
162		fee::WeightToFee,
163	};
164	use crate::weights::ExtrinsicBaseWeight;
165	use frame_support::weights::WeightToFee as WeightToFeeT;
166	use polkadot_runtime_common::MAXIMUM_BLOCK_WEIGHT;
167
168	#[test]
169	// Test that the fee for `MAXIMUM_BLOCK_WEIGHT` of weight has sane bounds.
170	fn full_block_fee_is_correct() {
171		// A full block should cost between 10 and 100 UNITS.
172		let full_block = WeightToFee::weight_to_fee(&MAXIMUM_BLOCK_WEIGHT);
173		assert!(full_block >= 10 * UNITS);
174		assert!(full_block <= 100 * UNITS);
175	}
176
177	#[test]
178	// This function tests that the fee for `ExtrinsicBaseWeight` of weight is correct
179	fn extrinsic_base_fee_is_correct() {
180		// `ExtrinsicBaseWeight` should cost 1/10 of a CENT
181		println!("Base: {}", ExtrinsicBaseWeight::get());
182		let x = WeightToFee::weight_to_fee(&ExtrinsicBaseWeight::get());
183		let y = CENTS / 10;
184		assert!(x.max(y) - x.min(y) < MILLICENTS);
185	}
186}
westend_runtime_constants/lib.rs

westend_runtime_constants/
lib.rs
