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babe: support online configuration upgrades (#5514)

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* babe: support online configuration upgrades

* Switch to use NextConfigDescriptor instead of changing runtime interface

* Fix tests

* epoch-changes: map function that allows converting with different epoch types

* Add migration script for the epoch config change

* Fix migration tests

* Fix migration: Epoch should be EpochV0

* Update client/consensus/babe/src/lib.rs

Co-Authored-By: André Silva <123550+andresilva@users.noreply.github.com>

* Fix new epochChanges version

* Fix unused imports

Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
This commit is contained in:
Wei Tang
2020-04-24 15:59:14 +02:00
committed by GitHub
parent a01e608dff
commit 770cc24c47
12 changed files with 300 additions and 86 deletions
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substrate/primitives/consensus/babe/src/digests.rs
+18 -3
View File
@@ -18,7 +18,7 @@
#[cfg(feature = "std")]
use super::{BABE_ENGINE_ID, AuthoritySignature};
use super::{AuthorityId, AuthorityIndex, SlotNumber, BabeAuthorityWeight};
use super::{AuthorityId, AuthorityIndex, SlotNumber, BabeAuthorityWeight, BabeEpochConfiguration};
#[cfg(feature = "std")]
use sp_runtime::{DigestItem, generic::OpaqueDigestItemId};
#[cfg(feature = "std")]
@@ -135,7 +135,7 @@ impl TryFrom<RawPreDigest> for PreDigest {
/// Information about the next epoch. This is broadcast in the first block
/// of the epoch.
#[derive(Decode, Encode, Default, PartialEq, Eq, Clone, RuntimeDebug)]
#[derive(Decode, Encode, PartialEq, Eq, Clone, RuntimeDebug)]
pub struct NextEpochDescriptor {
/// The authorities.
pub authorities: Vec<(AuthorityId, BabeAuthorityWeight)>,
@@ -144,6 +144,10 @@ pub struct NextEpochDescriptor {
pub randomness: Randomness,
}
/// Information about the next epoch config, if changed. This is broadcast in the first
/// block of the epoch, and applies using the same rules as `NextEpochDescriptor`.
pub type NextConfigDescriptor = BabeEpochConfiguration;
/// A digest item which is usable with BABE consensus.
#[cfg(feature = "std")]
pub trait CompatibleDigestItem: Sized {
@@ -159,8 +163,11 @@ pub trait CompatibleDigestItem: Sized {
/// If this item is a BABE signature, return the signature.
fn as_babe_seal(&self) -> Option<AuthoritySignature>;
/// If this item is a BABE epoch, return it.
/// If this item is a BABE epoch descriptor, return it.
fn as_next_epoch_descriptor(&self) -> Option<NextEpochDescriptor>;
/// If this item is a BABE config descriptor, return it.
fn as_next_config_descriptor(&self) -> Option<NextConfigDescriptor>;
}
#[cfg(feature = "std")]
@@ -190,4 +197,12 @@ impl<Hash> CompatibleDigestItem for DigestItem<Hash> where
_ => None,
})
}
fn as_next_config_descriptor(&self) -> Option<NextConfigDescriptor> {
self.try_to(OpaqueDigestItemId::Consensus(&BABE_ENGINE_ID))
.and_then(|x: super::ConsensusLog| match x {
super::ConsensusLog::NextConfigData(n) => Some(n),
_ => None,
})
}
}