Proposal: Flatten `AllPallets` and similar types #11813

kianenigma · 2022-07-11T13:04:43Z

Currently, all of the types generated via this macro are nested. For example, you have:

type AllPallets = (System, (Balances, Babe));

As far as I know, the main advantage of this is that we can use recursive implementations in some places. For example, PalletsInfoAccess introduced in https://github.com/paritytech/substrate/pull/10053/files is only implemented for (T1, T2), and there's no need to generate the code for longer tuples.

In fact, if we use only nested tuples, you can probably get away with impl_trait_for_tuple(2) for most items that are implemented for all pallets, such as OnInitialize etc.

The problem is: certain traits like OnInitialize are perfectly comprehensible both for T, and (T1, T2, T3), and (T1, (T2, T3)). But, certain traits like PalletInfoAccess are only comprehensible on individual items, i.e. T, but not on tuples.

And then you have an unfortunate scenario where you want to assert where T: PalletInfoAccess, and you know that each T does indeed implement PalletInfoAccess, but if demonstrated as a nested tuple, this does not work.

You can see a concrete example of this in what I am trying to do here: https://github.com/paritytech/substrate/pull/10174/files#diff-1c449417be9803cb427eed15d51557931141d47d0047561407f1651d319f7103R183

Lastly, in general, arguing about a flat array of tuples rather then nested is generally easier.

measure how slower it is to bump impl_trait_for_tuples to 100 instead of 30.

frame/support/src/traits/filter.rs

frame/support/src/traits/hooks.rs

frame/support/src/traits/metadata.rs

kianenigma · 2022-08-08T09:01:54Z

bot rebase

…lets-type

paritytech-processbot · 2022-08-08T09:02:02Z

Rebased

kianenigma · 2022-08-08T09:03:19Z

/cmd queue -c fmt $

command-bot · 2022-08-08T09:03:22Z

@kianenigma Could not find start of command (" $ ")

kianenigma · 2022-08-08T09:03:31Z

/cmd queue -c fmt

command-bot · 2022-08-08T09:03:33Z

@kianenigma Could not find start of command (" $ ")

kianenigma · 2022-08-08T09:04:01Z

/cmd queue -c fmt $ 1

command-bot · 2022-08-08T09:04:05Z

@kianenigma https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/1726286 was started for your command "$PIPELINE_SCRIPTS_DIR/fmt.sh" 1. Check out https://gitlab.parity.io/parity/mirrors/substrate/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

Comment /cmd cancel 11-58e217d0-cfd8-4c51-94b8-464e4f4538b4 to cancel this command or /cmd cancel to cancel all commands in this pull request.

command-bot · 2022-08-08T09:05:00Z

@kianenigma Command "$PIPELINE_SCRIPTS_DIR/fmt.sh" 1 has finished. Result: https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/1726286 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/1726286/artifacts/download.

frame/support/src/traits/metadata.rs

frame/support/src/migrations.rs

frame/support/procedural/src/construct_runtime/mod.rs

bkchr · 2022-08-11T10:32:11Z

frame/support/procedural/src/construct_runtime/mod.rs


 		/// All pallets included in the runtime as a nested tuple of types.
 		/// Excludes the System pallet.
-		pub type AllPalletsWithoutSystem = ( #all_pallets_without_system );
+		pub type AllPalletsWithoutSystem = ( #(#names_without_system),* );


Suggested change

pub type AllPalletsWithoutSystem = ( #(#names_without_system),* );

pub type AllPalletsWithoutSystem = ( #(#all_pallets_without_system),* );

bkchr · 2022-08-11T10:32:37Z

frame/support/procedural/src/construct_runtime/mod.rs

-		pub type AllPalletsWithoutSystemReversed = ( #all_pallets_without_system_reversed );
+		pub type AllPalletsWithoutSystemReversed =( #(#names_without_system_reverse),* );

 		/// All pallets included in the runtime as a nested tuple of types in reversed order.
-		pub type AllPalletsWithSystemReversed = ( #all_pallets_with_system_reversed );
+		pub type AllPalletsWithSystemReversed = ( #(#names_reversed),* );

 		/// All pallets included in the runtime as a nested tuple of types in reversed order.
 		/// With the system pallet first.
-		pub type AllPalletsReversedWithSystemFirst = (
-			#system_pallet,
-			AllPalletsWithoutSystemReversed
-		);
+		pub type AllPalletsReversedWithSystemFirst = ( #(#names_reversed_with_system_first),* );


I think we can probably now get rid of them?

I would start by marking them as deprecated? or are you sure they are not needed anywhere?

Yeah good idea.

Co-authored-by: Bastian Köcher <[email protected]>

kianenigma · 2022-08-12T18:39:53Z

bot rebase

…lets-type

paritytech-processbot · 2022-08-12T18:40:02Z

Rebased

paritytech-cicd-pr · 2022-08-12T18:54:28Z

The CI pipeline was cancelled due to failure one of the required jobs.
The job name - test-linux-stable
The job logs - https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/1740275

frame/support/Cargo.toml

…substrate into kiz-flatten-all-pallets-type

kianenigma · 2022-08-14T17:03:05Z

frame/support/test/tests/pallet_ui/hooks_invalid_item.stderr

@@ -1,13 +1,13 @@
 error[E0107]: missing generics for trait `Hooks`
-   --> $DIR/hooks_invalid_item.rs:12:18
+   --> tests/pallet_ui/hooks_invalid_item.rs:12:18


I am a little bit unsure about why I had to change this, but I assume it is harmless.

kianenigma · 2022-08-14T19:05:54Z

bot merge

* flratten AllPallets types * feature flag it * fix * fix * fmt * remove todo * Update frame/support/src/traits/metadata.rs Co-authored-by: Bastian Köcher <[email protected]> * Update frame/support/src/migrations.rs Co-authored-by: Bastian Köcher <[email protected]> * fix * mark as deprecated * add docs * fix ui test? * fmt Co-authored-by: parity-processbot <> Co-authored-by: Bastian Köcher <[email protected]>

Polkadot-Forum · 2023-05-11T12:14:01Z

This pull request has been mentioned on Polkadot Forum. There might be relevant details there:

https://forum.polkadot.network/t/polkadot-release-analysis-v0-9-41-v0-9-42/2828/1

flratten AllPallets types

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kianenigma marked this pull request as ready for review July 18, 2022 10:14

kianenigma added A0-please_review Pull request needs code review. and removed A3-in_progress Pull request is in progress. No review needed at this stage. labels Jul 18, 2022

kianenigma requested a review from bkchr July 18, 2022 10:14

kianenigma mentioned this pull request Jul 22, 2022

Runtime State Test + Integration with try-runtime #10174

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feature flag it

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Merge remote-tracking branch 'origin/master' into kiz-flatten-all-pal…

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kianenigma added C1-low PR touches the given topic and has a low impact on builders. D5-nicetohaveaudit ⚠️ PR contains trivial changes to logic that should be properly reviewed. labels Aug 8, 2022

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remove todo

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Co-authored-by: Bastian Köcher <[email protected]>

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support upgrade hooks to directly pass data #12185

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Proposal: Flatten `AllPallets` and similar types #11813

Proposal: Flatten `AllPallets` and similar types #11813

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Polkadot-Forum commented May 11, 2023

	pub type AllPalletsWithoutSystem = ( #(#names_without_system),* );
	pub type AllPalletsWithoutSystem = ( #(#all_pallets_without_system),* );

Proposal: Flatten AllPallets and similar types #11813

Proposal: Flatten AllPallets and similar types #11813

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Proposal: Flatten `AllPallets` and similar types #11813

Proposal: Flatten `AllPallets` and similar types #11813

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