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Adds support for returning a custom header from validate_block (#825)

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* Adds support for returning a custom header from `validate_block`

This adds support for returning a custom header from `validate_block`. Before this, we always
returned the header of the block that was validated (and still do it by default). However, after
this pr it is possible to set a custom header or better custom head data that will be returned
instead from `validate_block`. This can be for example when a chain wants to fork.

* FMT
This commit is contained in:
Bastian Köcher
2021-12-03 12:49:13 +01:00
committed by GitHub
parent 70ea98995a
commit 32a86d8ef4
8 changed files with 156 additions and 17 deletions
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cumulus/pallets/parachain-system/src/validate_block/implementation.rs
+7
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@@ -161,6 +161,13 @@ where
let horizontal_messages = crate::HrmpOutboundMessages::<PSC>::get();
let hrmp_watermark = crate::HrmpWatermark::<PSC>::get();
let head_data =
if let Some(custom_head_data) = crate::CustomValidationHeadData::<PSC>::get() {
HeadData(custom_head_data)
} else {
head_data
};
ValidationResult {
head_data,
new_validation_code: new_validation_code.map(Into::into),