Struct cumulus_pallet_parachain_system::relay_state_snapshot::RelayChainStateProof

pub struct RelayChainStateProof { /* private fields */ }

Expand description

A state proof extracted from the relay chain.

This state proof is extracted from the relay chain block we are building on top of.

Implementations§

impl RelayChainStateProof

pub fn new( para_id: ParaId, relay_parent_storage_root: Hash, proof: StorageProof, ) -> Result<Self, Error>

Create a new instance of Self.

Returns an error if the given relay_parent_storage_root is not the root of the given proof.

pub fn read_messaging_state_snapshot( &self, host_config: &AbridgedHostConfiguration, ) -> Result<MessagingStateSnapshot, Error>

Read the MessagingStateSnapshot from the relay chain state proof.

Returns an error if anything failed at reading or decoding.

pub fn read_abridged_host_configuration( &self, ) -> Result<AbridgedHostConfiguration, Error>

Read the [AbridgedHostConfiguration] from the relay chain state proof.

Returns an error if anything failed at reading or decoding.

pub fn read_included_para_head(&self) -> Result<HeadData, Error>

Read latest included parachain head data from the relay chain state proof.

Returns an error if anything failed at reading or decoding.

pub fn read_slot(&self) -> Result<Slot, Error>

Read the Slot from the relay chain state proof.

The slot is slot of the relay chain block this state proof was extracted from.

Returns an error if anything failed at reading or decoding.

pub fn read_upgrade_go_ahead_signal( &self, ) -> Result<Option<UpgradeGoAhead>, Error>

Read the go-ahead signal for the upgrade from the relay chain state proof.

The go-ahead specifies whether the parachain can apply the upgrade or should abort it. If the value is absent then there is either no judgment by the relay chain yet or no upgrade is pending.

Returns an error if anything failed at reading or decoding.

pub fn read_upgrade_restriction_signal( &self, ) -> Result<Option<UpgradeRestriction>, Error>

Read the upgrade restriction signal for the upgrade from the relay chain state proof.

If the upgrade restriction is not None, then the parachain cannot signal an upgrade at this block.

Returns an error if anything failed at reading or decoding.

pub fn read_entry<T>(&self, key: &[u8], fallback: Option<T>) -> Result<T, Error>
where T: Decode,

Read an entry given by the key and try to decode it. If the value specified by the key according to the proof is empty, the fallback value will be returned.

Returns Err in case the backend can’t return the value under the specific key (likely due to a malformed proof), in case the decoding fails, or in case where the value is empty in the relay chain state and no fallback was provided.

pub fn read_optional_entry<T>(&self, key: &[u8]) -> Result<Option<T>, Error>
where T: Decode,

Read an optional entry given by the key and try to decode it.

Returns Err in case the backend can’t return the value under the specific key (likely due to a malformed proof) or if the value couldn’t be decoded.

Auto Trait Implementations§

impl !Freeze for RelayChainStateProof

impl !RefUnwindSafe for RelayChainStateProof

impl Send for RelayChainStateProof

impl Sync for RelayChainStateProof

impl Unpin for RelayChainStateProof

impl !UnwindSafe for RelayChainStateProof

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