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Use decl_error in common runtime modules (#796)

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* use decl_error in common runtime modules

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
joe petrowski
2020-01-23 21:55:59 +01:00
committed by Bastian Köcher
parent 5621c18632
commit f50d0c6505
6 changed files with 300 additions and 136 deletions
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polkadot/runtime/common/src/attestations.rs
+13 -2
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@@ -21,7 +21,9 @@
use rstd::prelude::*;
use codec::{Encode, Decode};
use frame_support::{decl_storage, decl_module, ensure, dispatch::DispatchResult, traits::Get};
use frame_support::{
decl_storage, decl_module, decl_error, ensure, dispatch::DispatchResult, traits::Get
};
use primitives::{Hash, parachain::{AttestedCandidate, CandidateReceipt, Id as ParaId}};
use sp_runtime::RuntimeDebug;
@@ -106,13 +108,22 @@ decl_storage! {
}
}
decl_error! {
pub enum Error for Module<T: Trait> {
/// More attestations can be added only once in a block.
TooManyAttestations,
}
}
decl_module! {
/// Parachain-attestations module.
pub struct Module<T: Trait> for enum Call where origin: <T as system::Trait>::Origin {
type Error = Error<T>;
/// Provide candidate receipts for parachains, in ascending order by id.
fn more_attestations(origin, _more: MoreAttestations) -> DispatchResult {
ensure_none(origin)?;
ensure!(!<DidUpdate>::exists(), "More attestations can be added only once in a block.");
ensure!(!<DidUpdate>::exists(), Error::<T>::TooManyAttestations);
<DidUpdate>::put(true);
Ok(())