Enum sc_consensus_aura::CompatibilityMode

pub enum CompatibilityMode<N> {
    None,
    UseInitializeBlock {
        until: N,
    },
}

Run AURA in a compatibility mode.

This is required for when the chain was launched and later there was a consensus breaking change.

Variants

None

Don’t use any compatibility mode.

UseInitializeBlock

Fields

until: N

The block number until this compatibility mode should be executed. The first runtime call in the context of the until block (importing it/building it) will disable the compatibility mode (i.e. at until the default rules will apply). When enabling this compatibility mode the until block should be a future block on which all nodes will have upgraded to a release that includes the updated compatibility mode configuration. At until block there will be a hard fork when the authority set changes, between the old nodes (running with initialize_block, i.e. without the compatibility mode configuration) and the new nodes.

Call initialize_block before doing any runtime calls.

Previously the node would execute initialize_block before fetchting the authorities from the runtime. This behaviour changed in: https://github.com/paritytech/substrate/pull/9132

By calling initialize_block before fetching the authorities, on a block that would enact a new validator set, the block would already be build/sealed by an authority of the new set. With this mode disabled (the default) a block that enacts a new set isn’t sealed/built by an authority of the new set, however to make new nodes be able to sync old chains this compatibility mode exists.

Trait Implementations

impl<N: Clone> Clone for CompatibilityMode<N>

fn clone(&self) -> CompatibilityMode<N>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<N: Debug> Debug for CompatibilityMode<N>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<N> Default for CompatibilityMode<N>

fn default() -> Self

Returns the “default value” for a type.