[FRAME Core] General system for recognising and executing service work #206

gavofyork · 2023-03-03T14:21:18Z

There is often work (read: a state-transition which is potentially heavy) which needs to be done in a pallet when certain circumstances are reached. This is generally done either:

By having checks in on-chain state-transitioning code which recognises these conditions and immediately conducts the resulting work.
By using the on-chain scheduler or on_initialize to periodically check for such conditions and conduct the resulting work if met.
By having a service transaction which has arguments describing the work to be done and an off-chain script which determines if and when there are parameters which would result in work being done (and an Ok(Pays::No) returned rather than a fund-consuming Err).

All three of these have drawbacks. (1) introduces serious complexity into the code, possibly making effective benchmarking of an operation impractical. (2) wastes on-chain compute and introduces inescapable codepaths into block execution dramatically increasing the severity of bugs. (3) requires custom scripts to be made and spreads code with the same concern between languages (Rust and scripts) and codebases (the main pallet and a script repo) hurting development and maintenance.

What would be ideal is a standard means of determining what work can be executed via an off-chain worker or script and describing that work. A single script or (better) off-chain worker would recognise and be able to create and submit all possible work items at any given time as "service transactions". Pallets would only need to declare:

A Task data type (probably an enum like Call) which describes items of work.
Then, for each such item of work:
- any parameters which help specify the task;
- a function to be run by an off-chain worker which inspects the pallet's state and enumerates tasks of this kind;
- a function which checks that a particular value of the Task variant is indeed a valid piece of work (i.e. is contained in the prior enumeration);
- a function which accepts a particular value of a Task variant and (if valid) does the appropriate work.

Code-wise, it could look like this:

/// Some running total.
#[pallet::storage]
pub(super) type Total<T: Config<I>, I: 'static = ()> =
StorageValue<_, (u32, u32), ValueQuery>;

/// Numbers to be added into the total.
#[pallet::storage]
pub(super) type Numbers<T: Config<I>, I: 'static = ()> =
StorageMap<_, Twox64Concat, u32, u32, OptionQuery>;

#[pallet::tasks]
impl<T: Config<I>, I: 'static> Pallet<T, I> {
	/// Add a pair of numbers into the totals and remove them.
	#[pallet::tasks(Numbers::<T, I>::iter_keys())]
	#[pallet::condition(|i| Numbers::<T, I>::contains_key(i))]
	#[pallet::task_index(0)]
	pub fn add_number_into_total(i: u32) -> DispatchResult {
		let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?;
		Total::<T, I>::mutate(|(total_keys, total_values)| {
			*total_keys += i;
			*total_values += v;
		});
		Ok(())
	}
}

This task would be called into via a System-pallet extrinsic (either through the block-builder, an OCW, submitted via a script or even manually through a transaction) without any further logic in the pallet whatsoever. The extrinsic could be called something like fn do_task(origin: OriginFor<T>, task: Task).

A custom ValidateUnsigned within the System pallet which recognises this extrinsic would ensure that the condition for the task is met prior to accepting it via an inherent/unsigned extrinsic (signed transactions can call it anyway and risk payment not being refunded). tasks would ensure that the OCW/script could easily determine parameters which passed this condition.

If there were ever a bad bug (i.e. if add_number_into_total errored or panicked), then it would be easy to just not include the task in the block and the chain could continue operating as usual.

This would massively facilitate lazy-migrations. It would allow Scheduler, Referenda and other on_initialize code to be adapted to avoid big problems if there are unexpected circumstances/errors. And it would improve overall transaction bandwidth by allowing non-time-critical ramifications to be uncoupled from time-critical state-transitions.

Tasks could be labelled feeless in which case an origin check is unnecessary for all tasks which are considered tasks in the pre-dispatch.

TODO

The text was updated successfully, but these errors were encountered:

sam0x17 · 2023-03-03T17:14:32Z

I would be happy to take this on in the near future once benchmarking stuff wraps up

kianenigma · 2023-03-24T14:29:53Z

On old attempt at trying to achieve something like this: paritytech/substrate#8197

Also related: #198

xlc · 2023-03-25T04:37:57Z

I already proposed something similar at https://forum.polkadot.network/t/pallet-idea-safe-scheduler/1009
We have also implemented the Task data type with our idle-scheduler https://github.com/AcalaNetwork/Acala/blob/master/modules/idle-scheduler/src/lib.rs

kianenigma · 2023-03-26T10:57:31Z

If I want to rephrase what this issue is describing, I would do it as follows:

Currently, in order to have "occasional free tasks" in a pallet, one needs to put together a large amount of boilerplate code: An unsigned (or signed, but conditionally free) extrinsic, appropriate ValidateUnsigned and so on. We want to abstract all of this away.

Putting this next to #198, we have 3 ways to schedule optional tasks:

an extrinsic, as described in this issue.
on_idle, as experimented in @xlc's idle-scheduler.
poll, as described in [FRAME Core] Simple Multi-block Migrations #198.

If you care about safety of panics, only the first one is safe. If you care about going overweight, all 3 of them are safe. Note that poll is described as non-mandatory, so given correct benchmarking, neither will cause the block to go overweight.

I am a bit torn about which approach is the best to invest further in. An extrinsic sounds the most user friendly, given that it is fool-proof. If you put a panic in your code, fail to benchmark it correctly and so on, it will still work. But it has a few downsides too:

It relies on offchain machinery to function.
It is a lot of magic behind the scene, which could make it hard to reason about this new system.
It is not useful

I personally think that all of the above are useful in certain scenarios. We can start small and incrementally add different "modes of scheduling" to it, whilst keeping the API consistent.

So as a user pallet/runtime, you would schedule a task into the task scheduler, possibly by specifying:

enum Scheduling {
    /// Safest option. 
    Extrinsic,
    /// Scheduled at the end of blocks, as long as there is weight left after all mandatory and non-mandatory consumers. 
    OnIdle(Weight),
    /// The most aggressive scheduling type. 
    /// 
    /// Schedules the task to happen after all mandatory consumers, if there is weight left, but before all non-mandatory consumers. 
    Poll(Weight),
}

A task could be something as simple as:

trait Task {
    /// Run the tests, returning `Some(_)` if this task is not Over, `None` otherwise. 
    ///
    /// From the scheduling mode, an implementation can decide if and how they should run. Note that `OnIdle` and `Poll` specify a `max_weight_to_consume`, while `Extrinsic` does not. 
    fn run(self, scheduling: Scheduling) -> (Option<Self>, Weight)
}

/// All dispatchables are tasks by default, so you can just make a call be task. 
impl<T: Dispatchable> Task for T { .. }

I will try and come up with a PoC of a "omni-scheduler" as explained above and see what I can come up with.

xlc · 2023-03-26T21:50:19Z

I want to highlight a feature we implemented in the idle-scheduler is that it will automatically pause task dispatching if chain stall is detected. This ensures even if the task is bad (panic or overweight), it is still possible to rescue the chain.

In one of my old unfinished draft design of the omni scheduler, the tasks priorities and valid block range and that influence how the task are dispatched.

Dispatch mechanism:

On initialize
On idle
Unsigned tx sent from offchain worker
Signed tx send from user

High priority / time sensitive task will be dispatched with on_initialize. Time incentive task (such as lazy migration) will be dispatched with on_idle and fallback to unsigned_tx when approaching to deadline. Far future tasks are dispatched with ungined_tx. If those tasks are low priority, the unsigned_tx will schedule them into idle queue instead of dispatching them. Anyone can use signed tx to trigger a task as long as it is valid to dispatch it (i.e. current block within the execution range)

xlc · 2023-04-06T22:46:23Z

please share you design docs for discussion before start coding

sam0x17 · 2023-04-06T22:47:14Z

yup going to go over everything and propose something before I start coding 👍🏻

gavofyork · 2023-04-18T12:17:12Z

on_initialize and on_idle are useful abstractions and I expect they'll retain their use-cases, but the point of this is a) to be safe against panics; and b) to provide a general means of declaring work which needs to be done but has no specific deadline.

The idle-scheduler's Task API does not appear to be similar to that which I proposed here.

While I think it's reasonable to comment on the API as presented in the issue description to find means of syntactic improvement, I would not want this relatively well-defined and self-contained issue to suffer either from getting derailed or bikeshedded.

juangirini · 2023-05-22T09:18:18Z

Hey @sam0x17, are you already working on this? If you already have your proposed solution and/or PR, could you please share it?

sam0x17 · 2023-05-22T11:35:54Z

I have been mostly blocked until today getting paritytech/substrate#13454 merged but at this point I'm finally through all the change requests and merge conflicts and just have several places in the docs I need to update this morning and I should be good to finally put this as my first priority.

I have notes on a proposed solution I've been mulling over that I will formalize and post shortly. In the mean time if anyone I haven't spoken to has any other thoughts please feel free to share them!

sam0x17 · 2023-05-23T18:56:22Z

@gavofyork I have one question about your syntax above.. My understanding is that this closely follows how we implement #[pallet::call] and similar pallet macros, so it makes a lot of sense and I think that's great. One thing I can't figure out from the example is the purpose of the #[pallet::tasks(Numbers::<T, I>::iter_keys())] line. Could you explain how that integrates with the rest of the syntax and/or why we might need to specify this? At a glance I don't understand why we need to specify some iterable but I also haven't worked much with dispatchables so if it's obvious please excuse my ignorance!

gavofyork · 2023-05-25T04:29:31Z

Could you explain how that integrates with the rest of the syntax and/or why we might need to specify this?

How else could an off-chain worker understand what tasks exist to execute?

sam0x17 · 2023-05-30T16:17:02Z

All right I think I have my head around this much better after talking to @gupnik ❤️

I would propose we use something like the following as a starting point for the Task struct:

pub trait Task: Sized {
    /// Inspects the pallet's state and enumerates tasks of this kind.
    fn enumerate() -> Iter<Self>;

    /// Checks if a particular value of the `Task` variant is a valid piece of work.
    fn is_valid(&self) -> bool;

    /// Returns the `task_index` (analogous to `call_index`, but for tasks) of this
    /// `Task` variant.
    fn task_index(&self) -> usize;

    /// Performs the work for this particular `Task` variant.
    fn run(&self) -> Result<(), DispatchError>;
}

If this makes sense, I'd like to start by setting up the struct and seeing if I can get a manual end-to-end example working without the macros. Then we can iterate on this and implement the macros.

Sound good?

cc @gavofyork @xlc @kianenigma

xlc · 2023-05-30T21:21:15Z

fn enumerate() -> Vec<Self>; this is bad because for example f I want to run tasks for all the accounts (for migration), it could cause memory issue. It should return an iterator.

sam0x17 · 2023-05-31T12:20:23Z

yes you are right editing that, I had meant to write iter

gavofyork · 2023-06-08T10:14:16Z

Looks like the right API, yes.

I guess each pallet (which has tasks) would expose an enum Task which implements this TaskTrait, and then there would be an aggregate enum RuntimeTask, with a public API available to utilize enumerate over RPC and OCW? Do we want to bound TaskTrait on FullCodec?

sam0x17 · 2023-06-08T20:24:32Z

Do we want to bound TaskTrait on FullCodec?

That would make sense to me, so we can send these over RPC etc.

kianenigma · 2023-06-12T14:18:01Z

Do we want to bound TaskTrait on FullCodec?

That would make sense to me, so we can send these over RPC etc.

Will this also be useful for storing tasks in storage, mid-flight, just as we do with MBMs?

In general, a few examples of what would be first applications of this would be useful to share.

My guesses is that anything that can be coded as a MBM, can also be coded as this + a lazy-decode implementation that would do the migration upon first decoded. These tasks can then be used to enumerate and re-encode certain keys/prefixes. Very similar to what pallet-state-trie-migration does.

Does that sounds right?

Polkadot-Forum · 2023-06-19T12:27:14Z

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

https://forum.polkadot.network/t/pallet-idea-safe-scheduler/1009/7

Polkadot-Forum · 2023-07-04T14:29:59Z

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

https://forum.polkadot.network/t/make-xcm-execution-non-mandatory/3294/2

gupnik · 2023-07-06T05:24:56Z

@sam0x17 Would we need something around weights here?

sam0x17 · 2023-07-06T15:49:28Z

@sam0x17 Would we need something around weights here?

This is a very good question. @gavofyork will weights need to factor in to this at all?

gavofyork · 2023-07-14T15:10:52Z

Tasks will have weights, just like calls. If in doubt, consider a Task pretty much exactly the same "kind of thing" as a Call. There are several differences, but fundamentally they're quite similar.

xlc · 2023-09-26T23:11:20Z

Actually, it will be good if we have less macro magics.

Proposed syntax:

/// Some running total.
#[pallet::storage]
pub(super) type Total<T: Config<I>, I: 'static = ()> =
StorageValue<_, (u32, u32), ValueQuery>;

/// Numbers to be added into the total.
#[pallet::storage]
pub(super) type Numbers<T: Config<I>, I: 'static = ()> =
StorageMap<_, Twox64Concat, u32, u32, OptionQuery>;

struct AddNumberIntoTotal;
impl Task for AddNumberIntoTotal {
	const INDEX: u32 = 0;
	type Id = u32;

	fn all_tasks() -> Iterator<Self::Id> {
		Numbers::<T, I>::iter_keys()
	}

	// not very sure why this is needed. `all_tasks` should already filter out invalid tasks.
	fn condition(id: &Self::Id) -> bool {
		Numbers::<T, I>::contains_key(i)
	}

	fn run(id: &Self::Id) -> DispatchResult {
		let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?;
		Total::<T, I>::mutate(|(total_keys, total_values)| {
			*total_keys += i;
			*total_values += v;
		});
		Ok(())
	}
}

#[pallet::tasks]
type AllTasks = (AddNumberIntoTotal, )

sam0x17 · 2023-09-27T16:25:18Z

RE: @xlc

Proposed syntax:

FYI the current syntax I have built parsing support for lives here: #1343 (comment) and I have reproduced it below for reference:

#[pallet::task]
pub enum Task<T: Config> {
    AddNumberIntoTotal,
}

/// Some running total.
#[pallet::storage]
pub(super) type Total<T: Config<I>, I: 'static = ()> =
StorageValue<_, (u32, u32), ValueQuery>;

/// Numbers to be added into the total.
#[pallet::storage]
pub(super) type Numbers<T: Config<I>, I: 'static = ()> =
StorageMap<_, Twox64Concat, u32, u32, OptionQuery>;

#[pallet::tasks]
impl<T: Config<I>, I: 'static> Pallet<T, I> {
	/// Add a pair of numbers into the totals and remove them.
	#[pallet::task_list(Numbers::<T, I>::iter_keys())]
	#[pallet::task_condition(|i| Numbers::<T, I>::contains_key(i))]
	#[pallet::task_index(0)]
	pub fn add_number_into_total(i: u32) -> DispatchResult {
		let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?;
		Total::<T, I>::mutate(|(total_keys, total_values)| {
			*total_keys += i;
			*total_values += v;
		});
		Ok(())
	}
}

This is almost identical to Gav's proposed syntax introduced above (#206 (comment)) with a few naming changes for clarity and some pieces that weren't included in his original example like the #[pallet::task] enum that are necessary for all these pieces to work together.

The way I have implemented the syntax, you should be able to manually impl Task like you do above if you want to be more verbose (pending 1-2 tweaks I need to push up), and in fact this is a first-class feature because the way I have evolved the tasks-example pallet is to start with manual syntax like you have and slowly replace each piece with the macro accomplishing the same thing. I will make sure to keep this in mind and include a UI test that this still works when I am done if it would make you happier. I totally agree that we should always be able to manually impl stuff without using macros whenever feasible, and I'd like to support that as best as I can here. For me one of the stronger arguments for this is that it makes it much easier to debug macro expansions if the expansions themselves are supported syntax, so doing so is of course a win for everyone.

The only place where your syntax seems to differ from the above is tasks behave like events and errors in my syntax so there is a #[pallet::task] enum instead of it just being a tuple type.

I have no problem with leaving it open such that if #[pallet::task] isn't present anywhere it will just look for an impl statement impling the Task trait on something, and that something will be assumed to be an enum that should be aggregated as part of RuntimeTask. This should allow you to completely omit the task-related macros if you wish.

One thing I don't like about my syntax is I don't think it is very clear that #[pallet::task] is for the task enum... I followed this convention to match how call and error work but I do think #[pallet::task_enum] would be clearer and I would be happy to make that change since there are also other task-related attributes and intuitively, I would think #[pallet::task] would actually be applied to a specific task for example, and not the task enum. So I will probably do that rename of #[pallet::task] => #[pallet::task_enum] for 100% clarity.

but yes @xlc thank you for making the point that we want to make the macro syntax as optional as possible and I will stay true to that.

cc @gavofyork @kianenigma

gavofyork · 2023-10-06T15:16:32Z

Seems fine except for the requirement to declare the items within Task unlike with Call.

sam0x17 · 2023-10-06T15:17:35Z

Yeah retrofitting so we can omit the enum entirely and auto-generate it from the impl 👍🏻

edit: done

`polkadot-sdk` version of original tasks PR located here: paritytech/substrate#14329 Fixes #206 ## Status - [x] Generic `Task` trait - [x] `RuntimeTask` aggregated enum, compatible with `construct_runtime!` - [x] Casting between `Task` and `RuntimeTask` without needing `dyn` or `Box` - [x] Tasks Example pallet - [x] Runtime tests for Tasks example pallet - [x] Parsing for task-related macros - [x] Retrofit parsing to make macros optional - [x] Expansion for task-related macros - [x] Adds support for args in tasks - [x] Retrofit tasks example pallet to use macros instead of manual syntax - [x] Weights - [x] Cleanup - [x] UI tests - [x] Docs ## Target Syntax Adapted from #206 (comment) ```rust // NOTE: this enum is optional and is auto-generated by the other macros if not present #[pallet::task] pub enum Task<T: Config> { AddNumberIntoTotal { i: u32, } } /// Some running total. #[pallet::storage] pub(super) type Total<T: Config, I: 'static = ()> = StorageValue<_, (u32, u32), ValueQuery>; /// Numbers to be added into the total. #[pallet::storage] pub(super) type Numbers<T: Config, I: 'static = ()> = StorageMap<_, Twox64Concat, u32, u32, OptionQuery>; #[pallet::tasks_experimental] impl<T: Config, I: 'static> Pallet<T, I> { /// Add a pair of numbers into the totals and remove them. #[pallet::task_list(Numbers::<T, I>::iter_keys())] #[pallet::task_condition(|i| Numbers::<T, I>::contains_key(i))] #[pallet::task_index(0)] pub fn add_number_into_total(i: u32) -> DispatchResult { let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?; Total::<T, I>::mutate(|(total_keys, total_values)| { *total_keys += i; *total_values += v; }); Ok(()) } } ``` --------- Co-authored-by: Nikhil Gupta <[email protected]> Co-authored-by: kianenigma <[email protected]> Co-authored-by: Nikhil Gupta <> Co-authored-by: Gavin Wood <[email protected]> Co-authored-by: Oliver Tale-Yazdi <[email protected]> Co-authored-by: gupnik <[email protected]>

…itytech#1343) `polkadot-sdk` version of original tasks PR located here: paritytech/substrate#14329 Fixes paritytech#206 ## Status - [x] Generic `Task` trait - [x] `RuntimeTask` aggregated enum, compatible with `construct_runtime!` - [x] Casting between `Task` and `RuntimeTask` without needing `dyn` or `Box` - [x] Tasks Example pallet - [x] Runtime tests for Tasks example pallet - [x] Parsing for task-related macros - [x] Retrofit parsing to make macros optional - [x] Expansion for task-related macros - [x] Adds support for args in tasks - [x] Retrofit tasks example pallet to use macros instead of manual syntax - [x] Weights - [x] Cleanup - [x] UI tests - [x] Docs ## Target Syntax Adapted from paritytech#206 (comment) ```rust // NOTE: this enum is optional and is auto-generated by the other macros if not present #[pallet::task] pub enum Task<T: Config> { AddNumberIntoTotal { i: u32, } } /// Some running total. #[pallet::storage] pub(super) type Total<T: Config, I: 'static = ()> = StorageValue<_, (u32, u32), ValueQuery>; /// Numbers to be added into the total. #[pallet::storage] pub(super) type Numbers<T: Config, I: 'static = ()> = StorageMap<_, Twox64Concat, u32, u32, OptionQuery>; #[pallet::tasks_experimental] impl<T: Config, I: 'static> Pallet<T, I> { /// Add a pair of numbers into the totals and remove them. #[pallet::task_list(Numbers::<T, I>::iter_keys())] #[pallet::task_condition(|i| Numbers::<T, I>::contains_key(i))] #[pallet::task_index(0)] pub fn add_number_into_total(i: u32) -> DispatchResult { let v = Numbers::<T, I>::take(i).ok_or(Error::<T, I>::NotFound)?; Total::<T, I>::mutate(|(total_keys, total_values)| { *total_keys += i; *total_values += v; }); Ok(()) } } ``` --------- Co-authored-by: Nikhil Gupta <[email protected]> Co-authored-by: kianenigma <[email protected]> Co-authored-by: Nikhil Gupta <> Co-authored-by: Gavin Wood <[email protected]> Co-authored-by: Oliver Tale-Yazdi <[email protected]> Co-authored-by: gupnik <[email protected]>

gavofyork · 2024-07-08T10:05:43Z

Reopened as task-dispatch is still very much unfinished.

gavofyork assigned sam0x17 Mar 3, 2023

xlc mentioned this issue Mar 29, 2023

Adding CallFilter to calling pallets #197

Open

juangirini added the T1-runtime label Jun 7, 2023

sam0x17 mentioned this issue Jun 8, 2023

FRAME: General System for Recognizing and Executing Service Work paritytech/substrate#14329

Draft

kianenigma changed the title ~~FRAME: General system for recognising and executing service work~~ [FRAME Core] General system for recognising and executing service work Jun 26, 2023

xlc mentioned this issue Aug 24, 2023

Rename ParaId and para_id #601

Open

juangirini transferred this issue from paritytech/substrate Aug 24, 2023

the-right-joyce added T1-FRAME This PR/Issue is related to core FRAME, the framework. and removed T1-runtime labels Aug 25, 2023

sam0x17 mentioned this issue Aug 31, 2023

Tasks: general system for recognizing and executing service work #1343

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[FRAME Core] General system for recognising and executing service work #206

[FRAME Core] General system for recognising and executing service work #206

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[FRAME Core] General system for recognising and executing service work #206

[FRAME Core] General system for recognising and executing service work #206

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TODO

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sam0x17 commented May 22, 2023 •

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sam0x17 commented May 30, 2023 •

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xlc commented May 30, 2023 •

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sam0x17 commented May 31, 2023 •

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sam0x17 commented Sep 27, 2023 •

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sam0x17 commented Oct 6, 2023 •

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