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ChainSpec trait (#5185)

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* ChainSpec trait

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* Added docs

* Fixed build

* Fixed build

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
Arkadiy Paronyan
2020-03-12 00:00:10 +01:00
committed by GitHub
parent d2345e8d5c
commit dc0bf210fb
38 changed files with 354 additions and 335 deletions
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substrate/client/chain-spec/src/extension.rs
+30 -4
View File
@@ -17,6 +17,8 @@
//! Chain Spec extensions helpers.
use std::fmt::Debug;
use std::any::{TypeId, Any};
use std::collections::BTreeMap;
use serde::{Serialize, Deserialize, de::DeserializeOwned};
@@ -120,6 +122,8 @@ pub trait Extension: Serialize + DeserializeOwned + Clone {
/// Get an extension of specific type.
fn get<T: 'static>(&self) -> Option<&T>;
/// Get an extension of specific type as refernce to `Any`
fn get_any(&self, t: TypeId) -> &dyn Any;
/// Get forkable extensions of specific type.
fn forks<BlockNumber, T>(&self) -> Option<Forks<BlockNumber, T>> where
@@ -137,6 +141,7 @@ impl Extension for crate::NoExtension {
type Forks = Self;
fn get<T: 'static>(&self) -> Option<&T> { None }
fn get_any(&self, _t: TypeId) -> &dyn Any { self }
}
pub trait IsForks {
@@ -225,22 +230,25 @@ impl<B, E> Extension for Forks<B, E> where
type Forks = Self;
fn get<T: 'static>(&self) -> Option<&T> {
use std::any::{TypeId, Any};
match TypeId::of::<T>() {
x if x == TypeId::of::<E>() => Any::downcast_ref(&self.base),
_ => self.base.get(),
}
}
fn get_any(&self, t: TypeId) -> &dyn Any {
match t {
x if x == TypeId::of::<E>() => &self.base,
_ => self.base.get_any(t),
}
}
fn forks<BlockNumber, T>(&self) -> Option<Forks<BlockNumber, T>> where
BlockNumber: Ord + Clone + 'static,
T: Group + 'static,
<Self::Forks as IsForks>::Extension: Extension,
<<Self::Forks as IsForks>::Extension as Group>::Fork: Extension,
{
use std::any::{TypeId, Any};
if TypeId::of::<BlockNumber>() == TypeId::of::<B>() {
Any::downcast_ref(&self.for_type::<T>()?).cloned()
} else {
@@ -250,6 +258,24 @@ impl<B, E> Extension for Forks<B, E> where
}
}
/// A subset if the `Extension` trait that only allows for quering extensions.
pub trait GetExtension {
/// Get an extension of specific type.
fn get_any(&self, t: TypeId) -> &dyn Any;
}
impl <E: Extension> GetExtension for E {
fn get_any(&self, t: TypeId) -> &dyn Any {
Extension::get_any(self, t)
}
}
/// Helper function that queries an extension by type from `GetExtension`
/// trait object.
pub fn get_extension<T: 'static>(e: &dyn GetExtension) -> Option<&T> {
Any::downcast_ref(GetExtension::get_any(e, TypeId::of::<T>()))
}
#[cfg(test)]
mod tests {
use super::*;