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System should provide default Lookup impl (#906)

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* System should provide default Lookup impl

* Use proxy struct as in balances
This commit is contained in:
Gav Wood
2018-10-14 21:58:38 +02:00
committed by GitHub
parent 26b105b472
commit f6f1d8dbc9
1 changed files with 18 additions and 3 deletions
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substrate/srml/system/src/lib.rs
+18 -3
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@@ -40,7 +40,7 @@ extern crate sr_primitives as primitives;
extern crate safe_mix;
use rstd::prelude::*;
use primitives::traits::{self, CheckEqual, SimpleArithmetic, SimpleBitOps, Zero, One, Bounded,
use primitives::traits::{self, CheckEqual, SimpleArithmetic, SimpleBitOps, Zero, One, Bounded, Lookup,
Hash, Member, MaybeDisplay, EnsureOrigin, Digest as DigestT, As, CurrentHeight, BlockNumberToHash};
use substrate_primitives::storage::well_known_keys;
use runtime_support::{storage, StorageValue, StorageMap, Parameter};
@@ -397,14 +397,29 @@ impl<T: Trait> Module<T> {
}
}
impl<T: Trait> CurrentHeight for Module<T> {
pub struct ChainContext<T>(::rstd::marker::PhantomData<T>);
impl<T> Default for ChainContext<T> {
fn default() -> Self {
ChainContext(::rstd::marker::PhantomData)
}
}
impl<T: Trait> Lookup for ChainContext<T> {
type Source = T::AccountId;
type Target = T::AccountId;
fn lookup(&self, s: Self::Source) -> rstd::result::Result<Self::Target, &'static str> {
Ok(s)
}
}
impl<T: Trait> CurrentHeight for ChainContext<T> {
type BlockNumber = T::BlockNumber;
fn current_height(&self) -> Self::BlockNumber {
<Module<T>>::block_number()
}
}
impl<T: Trait> BlockNumberToHash for Module<T> {
impl<T: Trait> BlockNumberToHash for ChainContext<T> {
type BlockNumber = T::BlockNumber;
type Hash = T::Hash;
fn block_number_to_hash(&self, n: Self::BlockNumber) -> Option<Self::Hash> {