Refactor event type decoding and declaration #221
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h4x3rotab
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Fixes paritytech#196, paritytech#181, #28 ## Dyanmic sized types Before this change, the event decoder assume all the event types have fixed sizes. Some counterexamples are: Hashes, AuthorityList. In this change, instead of decoding by skipping the fixed-length bytes, we introduce `type_segmenter` registry which decodes the raw event bytes with the actual scale codec. So variable length types can be handled correctly. ## New attribute for pallet type definition In the past, trait associated type is the only way to add types to the EventsDecoder implementation of a pallet. But in reality it's common that the events in a pallet references some types not defined in the trait associated types. Some examples are: `IdentificationTuple` and `SessionIndex` in Session pallet. In this change, we introduce more attributes to add the types: ```rust #[module] trait Pallet: System { #![event_type(SomeType)] #![event_alias(TypeNameAlias = SomeType)] #![event_alias(SomeOtherAlias = TypeWithAssociatedTypes<T>)] } ``` ## Tested Compile with `nightly-2020-10-01`; smoke test to sync a full Phala bockchain.
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Any updates? |
ascjones
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The CI failed at "pure virtual method called". I believe it's a flaky test. It looks like due to the test full node not being properly killed: openethereum/parity-ethereum#6213 |
Yeah that happens fairly frequently unfortunately, see #178. |
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Fixes #196, fixes #181, fixes #28
Dynamic sized types
Before this change, the event decoder assume all the event types have fixed sizes. Some counterexamples are: Hashes, AuthorityList.
In this change, instead of decoding by skipping the fixed-length bytes, we introduce
type_segmenterregistry which decodes the raw event bytes with the actual scale codec. So variable length types can be handled correctly.New attribute for pallet type definition
In the past, trait associated type is the only way to add types to the EventsDecoder implementation of a pallet. But in reality it's common that the events in a pallet references some types not defined in the trait associated types. Some examples are:
IdentificationTupleandSessionIndexin Session pallet.In this change, we introduce more attributes to add the types:
Tested
Compile with
nightly-2020-10-01; smoke test to sync a fullPhala bockchain.