pub struct RequireSecondedInBlockAnnounce<Block, RCInterface> { /* private fields */ }Expand description
Parachain specific block announce validator.
This is not required when the collation mechanism itself is sybil-resistant, as it is a spam protection mechanism used to prevent nodes from dealing with unbounded numbers of blocks. For sybil-resistant collation mechanisms, this will only slow things down.
This block announce validator is required if the parachain is running with the relay chain provided consensus to make sure each node only imports a reasonable number of blocks per round. The relay chain provided consensus doesn’t have any authorities and so it could happen that without this special block announce validator a node would need to import millions of blocks per round, which is clearly not doable.
To solve this problem, each block announcement is delayed until a collator
has received a Statement::Seconded for its PoV. This message tells the
collator that its PoV was validated successfully by a parachain validator and
that it is very likely that this PoV will be included in the relay chain. Every
collator that doesn’t receive the message for its PoV will not announce its block.
For more information on the block announcement, see WaitToAnnounce.
For each block announcement that is received, the generic block announcement validation
will call this validator and provides the extra data that was attached to the announcement.
We call this extra data justification.
It is expected that the attached data is a SCALE encoded BlockAnnounceData. The
statement is checked to be a CompactStatement::Seconded and that it is signed by an active
parachain validator.
If no justification was provided we check if the block announcement is at the tip of the known chain. If it is at the tip, it is required to provide a justification or otherwise we reject it. However, if the announcement is for a block below the tip the announcement is accepted as it probably comes from a node that is currently syncing the chain.
Implementations§
source§impl<Block, RCInterface> RequireSecondedInBlockAnnounce<Block, RCInterface>where
RCInterface: Clone,
impl<Block, RCInterface> RequireSecondedInBlockAnnounce<Block, RCInterface>where RCInterface: Clone,
sourcepub fn new(relay_chain_interface: RCInterface, para_id: ParaId) -> Self
pub fn new(relay_chain_interface: RCInterface, para_id: ParaId) -> Self
Create a new RequireSecondedInBlockAnnounce.
Trait Implementations§
source§impl<Block: BlockT, RCInterface> BlockAnnounceValidator<Block> for RequireSecondedInBlockAnnounce<Block, RCInterface>where
RCInterface: RelayChainInterface + Clone + 'static,
impl<Block: BlockT, RCInterface> BlockAnnounceValidator<Block> for RequireSecondedInBlockAnnounce<Block, RCInterface>where RCInterface: RelayChainInterface + Clone + 'static,
source§impl<Block: Clone, RCInterface: Clone> Clone for RequireSecondedInBlockAnnounce<Block, RCInterface>
impl<Block: Clone, RCInterface: Clone> Clone for RequireSecondedInBlockAnnounce<Block, RCInterface>
source§fn clone(&self) -> RequireSecondedInBlockAnnounce<Block, RCInterface>
fn clone(&self) -> RequireSecondedInBlockAnnounce<Block, RCInterface>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source. Read moreAuto Trait Implementations§
impl<Block, RCInterface> RefUnwindSafe for RequireSecondedInBlockAnnounce<Block, RCInterface>where Block: RefUnwindSafe, RCInterface: RefUnwindSafe,
impl<Block, RCInterface> Send for RequireSecondedInBlockAnnounce<Block, RCInterface>where Block: Send, RCInterface: Send,
impl<Block, RCInterface> Sync for RequireSecondedInBlockAnnounce<Block, RCInterface>where Block: Sync, RCInterface: Sync,
impl<Block, RCInterface> Unpin for RequireSecondedInBlockAnnounce<Block, RCInterface>where Block: Unpin, RCInterface: Unpin,
impl<Block, RCInterface> UnwindSafe for RequireSecondedInBlockAnnounce<Block, RCInterface>where Block: UnwindSafe, RCInterface: UnwindSafe,
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