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Change TracksInfo::tracks to return an iterator
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Using an iterator instead of a static slice allows for more flexible
implementations of `TracksInfo` that can use the chain storage without
compromising a lot on the performance/memory penalty if we were to return
an owned `Vec` instead.

NOTE: This feature will benefit from the soon to be released
return_position_impl_trait_in_trait(rust-lang/rust#115822)
to not require the `TracksIter` associated type and from a bugfix in the
compiler(rust-lang/rust#116662) to declare the
DEFAULT_MAX_TRACK_NAME_LEN generic constant in the `TracksInfo` trait.
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@olanod
olanod committed Nov 20, 2023
1 parent 794ee98 commit 750f1bb
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Showing 13 changed files with 749 additions and 667 deletions.
104 changes: 54 additions & 50 deletions cumulus/parachains/runtimes/collectives/collectives-polkadot/src/ambassador/tracks.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,9 @@
use super::Origin;
use crate::{Balance, BlockNumber, RuntimeOrigin, DAYS, DOLLARS, HOURS};
use sp_runtime::Perbill;
use pallet_referenda::{StaticTracksIter, Track};
use sp_runtime::{str_array as s, Perbill};
use sp_std::borrow::Cow::Borrowed;

/// Referendum `TrackId` type.
pub type TrackId = u16;
Expand Down Expand Up @@ -46,13 +48,15 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {

type RuntimeOrigin = <RuntimeOrigin as frame_support::traits::OriginTrait>::PalletsOrigin;

type TracksIter = StaticTracksIter<Self::Id, Balance, BlockNumber>;

/// Return the array of available tracks and their information.
fn tracks() -> &'static [(Self::Id, pallet_referenda::TrackInfo<Balance, BlockNumber>)] {
static DATA: [(TrackId, pallet_referenda::TrackInfo<Balance, BlockNumber>); 9] = [
(
constants::AMBASSADOR_TIER_1,
pallet_referenda::TrackInfo {
name: "ambassador tier 1",
fn tracks() -> Self::TracksIter {
static DATA: [Track<TrackId, Balance, BlockNumber>; 9] = [
Track {
id: constants::AMBASSADOR_TIER_1,
info: pallet_referenda::TrackInfo {
name: s("ambassador tier 1"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -70,11 +74,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::AMBASSADOR_TIER_2,
pallet_referenda::TrackInfo {
name: "ambassador tier 2",
},
Track {
id: constants::AMBASSADOR_TIER_2,
info: pallet_referenda::TrackInfo {
name: s("ambassador tier 2"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -92,11 +96,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::SENIOR_AMBASSADOR_TIER_3,
pallet_referenda::TrackInfo {
name: "senior ambassador tier 3",
},
Track {
id: constants::SENIOR_AMBASSADOR_TIER_3,
info: pallet_referenda::TrackInfo {
name: s("senior ambassador tier 3"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -114,11 +118,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::SENIOR_AMBASSADOR_TIER_4,
pallet_referenda::TrackInfo {
name: "senior ambassador tier 4",
},
Track {
id: constants::SENIOR_AMBASSADOR_TIER_4,
info: pallet_referenda::TrackInfo {
name: s("senior ambassador tier 4"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -136,11 +140,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::HEAD_AMBASSADOR_TIER_5,
pallet_referenda::TrackInfo {
name: "head ambassador tier 5",
},
Track {
id: constants::HEAD_AMBASSADOR_TIER_5,
info: pallet_referenda::TrackInfo {
name: s("head ambassador tier 5"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -158,11 +162,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::HEAD_AMBASSADOR_TIER_6,
pallet_referenda::TrackInfo {
name: "head ambassador tier 6",
},
Track {
id: constants::HEAD_AMBASSADOR_TIER_6,
info: pallet_referenda::TrackInfo {
name: s("head ambassador tier 6"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -180,11 +184,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::HEAD_AMBASSADOR_TIER_7,
pallet_referenda::TrackInfo {
name: "head ambassador tier 7",
},
Track {
id: constants::HEAD_AMBASSADOR_TIER_7,
info: pallet_referenda::TrackInfo {
name: s("head ambassador tier 7"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -202,11 +206,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::MASTER_AMBASSADOR_TIER_8,
pallet_referenda::TrackInfo {
name: "master ambassador tier 8",
},
Track {
id: constants::MASTER_AMBASSADOR_TIER_8,
info: pallet_referenda::TrackInfo {
name: s("master ambassador tier 8"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -224,11 +228,11 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
(
constants::MASTER_AMBASSADOR_TIER_9,
pallet_referenda::TrackInfo {
name: "master ambassador tier 9",
},
Track {
id: constants::MASTER_AMBASSADOR_TIER_9,
info: pallet_referenda::TrackInfo {
name: s("master ambassador tier 9"),
max_deciding: 10,
decision_deposit: 5 * DOLLARS,
prepare_period: 24 * HOURS,
Expand All @@ -246,9 +250,9 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
ceil: Perbill::from_percent(50),
},
},
),
},
];
&DATA[..]
DATA.iter().map(Borrowed)
}

/// Determine the voting track for the given `origin`.
Expand All @@ -259,7 +263,7 @@ impl pallet_referenda::TracksInfo<Balance, BlockNumber> for TracksInfo {
// It is important that this is not available in production!
let root: Self::RuntimeOrigin = frame_system::RawOrigin::Root.into();
if &root == id {
return Ok(constants::MASTER_AMBASSADOR_TIER_9)
return Ok(constants::MASTER_AMBASSADOR_TIER_9);
}
}

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