Make Staking pallet using a proper Time module. #4662

gui1117 · 2020-01-17T13:28:35Z

(EDITED)

the staking modules make use of Time trait to get the time in millisecond, however this a wrong usage of such traits which doesn't specifies what is moment.

To solve this this PR introduce a new trait named UnixTime implemented by timestamp and used by staking.

As said by Kian it would be great to have more docs on the Time trait itself and usage it is suppose to have. But I struggle to define any documentation for this trait.

The migration is implemented in such a way that the active era start at the moment of the migration.
This is needed because even if the wrong usage of Time correctly returned a moment in millisecond there is no guarantee that this moment is since unix_epoch.

On Kusama however the old Time was indeed the millisecond since unix epoch thus we could improve kusama migration.

frame/support/src/traits.rs

bkchr · 2020-02-03T08:44:40Z

Any update on this?

gui1117 · 2020-02-03T09:31:43Z

OK I made an alternative implementation, otherwise I can do now_millis but I feel like this way the moment of now is a bit more configurable.

bkchr · 2020-02-03T09:49:48Z

frame/support/src/traits.rs

+	/// Duration for a Julian year (365.25 days).
+	fn year() -> Self::Moment;
+
+	/// Return current moment.
 	fn now() -> Self::Moment;


Now you are mixing some time related functionality (year()) with a moment that can be anything.

I still think we should keep this Time trait simple and say that now() will return a moment that increases between blocks, but without specifying what it is. It could also be the moment from the genesis of the chain.

I would add another trait UnixTime that clearly says that now() returns the Duration from the unix epoch. I would directly return core::time::Duration. This already brings all the functions for converting between the different time formats.

The timestamp module would implement both of these traits and return the same value for both now() calls, but as different types. Staking would require that Time implements UnixTime.

yes, I completely agree

frame/staking/src/lib.rs

frame/staking/src/migration.rs

gnunicorn · 2020-02-18T14:51:16Z

please update to latest master.

frame/staking/src/mock.rs

kianenigma · 2020-03-09T07:55:09Z

I think it should be explained in the timestamp module when another module (i.e. staking in this case) should use Time impl and and when UnixTime.

Co-Authored-By: Kian Paimani <[email protected]>

bkchr · 2020-03-09T09:56:12Z

I think it should be explained in the timestamp module when another module (i.e. staking in this case) should use Time impl and and when UnixTime.

Why? It depends on what the module requires on constraints and not what the timestamp module provides.

You could just have the requirement of time increasing which could be anything, even just the block number.

Or like staking you really need UNIX time.

gui1117 · 2020-03-09T09:57:25Z

I think it should be explained in the timestamp module when another module (i.e. staking in this case) should use Time impl and and when UnixTime.

to be honest I struggle to know what are the guarantee of Time, maybe that it can only increase.

bkchr · 2020-03-09T16:20:05Z

frame/staking/src/lib.rs

+	/// Deprecated Time.
+	///
+	/// Deprecated associated type wrongly used to query Time in millisecond.
+	type DeprecatedTime: Time;


Why do we need this?

the main use it to be able to decode the old structure ActiveInfo<MomentOf<T>>.
But indeed I can just decode the EraIndex and not start field as I don't use it.

I updated code as such, (also fixing that StorageVersion wasn't set)

bkchr · 2020-03-24T10:59:45Z

What is your plan with this @thiolliere ?

gui1117 · 2020-03-25T12:12:59Z

frame/staking/src/lib.rs

 }

 impl Default for Releases {
 	fn default() -> Self {
-		Releases::V2_0_0
+		Releases::V3_0_0


I'm not sure what to think about this default, because if we add staking in a running chain (so without executing GenesisConfig) then we must insert the storage version in the runtime upgrade.
I think a staking module without any storage version must be considered invalid now.

otherwise if a chain introduce staking module without inserting the storage version then the storage version depends on when it has been inserted, and storage version could be V2 or V3 there is no way to know it.

gui1117 · 2020-03-25T12:14:55Z

What is your plan with this @thiolliere ?

OK as the strategy for now is only to support Kusama I updated the runtime_upgrade code.
And merged master.

The PR is now ready for review

frame/timestamp/src/lib.rs

bkchr · 2020-03-26T08:38:30Z

Please merge master.

Co-Authored-By: Bastian Köcher <[email protected]>

kianenigma · 2020-03-26T11:24:51Z

Needed a polkadot companion PR :(

gui1117 · 2020-03-26T11:57:24Z

sorry done here paritytech/polkadot#941

gui1117 requested a review from kianenigma as a code owner January 17, 2020 13:28

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gui1117 force-pushed the gui-time-doc branch from 8f973d2 to f6ed7f1 Compare February 3, 2020 09:29

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gui1117 added A0-please_review Pull request needs code review. B1-runtimenoteworthy and removed A3-in_progress Pull request is in progress. No review needed at this stage. labels Feb 4, 2020

gui1117 changed the title ~~Write documentation for Time trait~~ Make Staking pallet using a proper Time module. Feb 4, 2020

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add new trait, still migration to make

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Co-Authored-By: Kian Paimani <[email protected]>

fix test

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no longer require DeprecatedTime

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gui1117 added 5 commits March 25, 2020 11:52

Merge remote-tracking branch 'origin/master' into HEAD

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add test

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fix version

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upgrade only from kusama

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add test

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fix test

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Update frame/timestamp/src/lib.rs

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Co-Authored-By: Bastian Köcher <[email protected]>

Merge remote-tracking branch 'origin/master' into gui-time-doc

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AurevoirXavier mentioned this pull request Apr 10, 2020

Switch to UnixTime darwinia-network/darwinia-common#51

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apopiak added the D1-runtime-migration label Jun 22, 2020

This was referenced Jun 22, 2020

Runtime migrations tracking issue hicommonwealth/edgeware-node#164

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Improve Migration Support paritytech/polkadot-sdk#353

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Make Staking pallet using a proper Time module. #4662

Make Staking pallet using a proper Time module. #4662

gui1117 commented Jan 17, 2020 •

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gui1117 commented Mar 26, 2020

Make Staking pallet using a proper Time module. #4662

Make Staking pallet using a proper Time module. #4662

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