pub struct View { /* private fields */ }
Expand description
Handles the implicit view of the relay chain derived from the immediate view, which is composed of active leaves, and the minimum relay-parents allowed for candidates of various parachains at those leaves.
Implementations§
source§impl View
impl View
sourcepub fn leaves(&self) -> impl Iterator<Item = &Hash>
pub fn leaves(&self) -> impl Iterator<Item = &Hash>
Get an iterator over active leaves in the view.
sourcepub async fn activate_leaf<Sender>(
&mut self,
sender: &mut Sender,
leaf_hash: Hash,
) -> Result<(), FetchError>where
Sender: SubsystemSender<ChainApiMessage> + SubsystemSender<ProspectiveParachainsMessage> + SubsystemSender<RuntimeApiMessage>,
pub async fn activate_leaf<Sender>(
&mut self,
sender: &mut Sender,
leaf_hash: Hash,
) -> Result<(), FetchError>where
Sender: SubsystemSender<ChainApiMessage> + SubsystemSender<ProspectiveParachainsMessage> + SubsystemSender<RuntimeApiMessage>,
Activate a leaf in the view. This will request the minimum relay parents the leaf and will load headers in the ancestry of the leaf as needed. These are the ‘implicit ancestors’ of the leaf.
To maximize reuse of outdated leaves, it’s best to activate new leaves before deactivating old ones.
The allowed relay parents for the relevant paras under this leaf can be
queried with View::known_allowed_relay_parents_under
.
No-op for known leaves.
sourcepub fn activate_leaf_from_prospective_parachains(
&mut self,
leaf: BlockInfoProspectiveParachains,
ancestors: &[BlockInfoProspectiveParachains],
)
pub fn activate_leaf_from_prospective_parachains( &mut self, leaf: BlockInfoProspectiveParachains, ancestors: &[BlockInfoProspectiveParachains], )
Activate a leaf in the view. To be used by the prospective parachains subsystem.
This will not request any additional data, as prospective parachains already provides all
the required info.
NOTE: using activate_leaf
instead of this function will result in a
deadlock, as it calls prospective-parachains under the hood.
No-op for known leaves.
sourcepub fn deactivate_leaf(&mut self, leaf_hash: Hash) -> Vec<Hash>
pub fn deactivate_leaf(&mut self, leaf_hash: Hash) -> Vec<Hash>
Deactivate a leaf in the view. This prunes any outdated implicit ancestors as well.
Returns hashes of blocks pruned from storage.
sourcepub fn all_allowed_relay_parents(&self) -> impl Iterator<Item = &Hash>
pub fn all_allowed_relay_parents(&self) -> impl Iterator<Item = &Hash>
Get an iterator over all allowed relay-parents in the view with no particular order.
Important: not all blocks are guaranteed to be allowed for some leaves, it may happen that a block info is only kept in the view storage because of a retaining rule.
For getting relay-parents that are valid for parachain candidates use
View::known_allowed_relay_parents_under
.
sourcepub fn known_allowed_relay_parents_under(
&self,
block_hash: &Hash,
para_id: Option<ParaId>,
) -> Option<&[Hash]>
pub fn known_allowed_relay_parents_under( &self, block_hash: &Hash, para_id: Option<ParaId>, ) -> Option<&[Hash]>
Get the known, allowed relay-parents that are valid for parachain candidates which could be backed in a child of a given block for a given para ID.
This is expressed as a contiguous slice of relay-chain block hashes which may include the provided block hash itself.
If para_id
is None
, this returns all valid relay-parents across all paras
for the leaf.
None
indicates that the block hash isn’t part of the implicit view or that
there are no known allowed relay parents.
This always returns Some
for active leaves or for blocks that previously
were active leaves.
This can return the empty slice, which indicates that no relay-parents are allowed for the para, e.g. if the para is not scheduled at the given block hash.
Trait Implementations§
Auto Trait Implementations§
impl Freeze for View
impl RefUnwindSafe for View
impl Send for View
impl Sync for View
impl Unpin for View
impl UnwindSafe for View
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