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Enum polkadot_node_subsystem::messages::ChainApiMessage

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pub enum ChainApiMessage {
    BlockNumber(H256, Sender<Result<Option<u32>, ChainApiError>>),
    BlockHeader(H256, Sender<Result<Option<Header<u32, BlakeTwo256>>, ChainApiError>>),
    BlockWeight(H256, Sender<Result<Option<u32>, ChainApiError>>),
    FinalizedBlockHash(u32, Sender<Result<Option<H256>, ChainApiError>>),
    FinalizedBlockNumber(Sender<Result<u32, ChainApiError>>),
    Ancestors {
        hash: H256,
        k: usize,
        response_channel: Sender<Result<Vec<H256>, ChainApiError>>,
    },
}
Expand description

Chain API request subsystem message.

Variants§

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BlockNumber(H256, Sender<Result<Option<u32>, ChainApiError>>)

Request the block number by hash. Returns None if a block with the given hash is not present in the db.

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BlockHeader(H256, Sender<Result<Option<Header<u32, BlakeTwo256>>, ChainApiError>>)

Request the block header by hash. Returns None if a block with the given hash is not present in the db.

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BlockWeight(H256, Sender<Result<Option<u32>, ChainApiError>>)

Get the cumulative weight of the given block, by hash. If the block or weight is unknown, this returns None.

Note: this is the weight within the low-level fork-choice rule, not the high-level one implemented in the chain-selection subsystem.

Weight is used for comparing blocks in a fork-choice rule.

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FinalizedBlockHash(u32, Sender<Result<Option<H256>, ChainApiError>>)

Request the finalized block hash by number. Returns None if a block with the given number is not present in the db. Note: the caller must ensure the block is finalized.

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FinalizedBlockNumber(Sender<Result<u32, ChainApiError>>)

Request the last finalized block number. This request always succeeds.

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Ancestors

Request the k ancestor block hashes of a block with the given hash. The response channel may return a Vec of size up to k filled with ancestors hashes with the following order: parent, grandparent, … up to the hash of genesis block with number 0, including it.

Fields

§hash: H256

The hash of the block in question.

§k: usize

The number of ancestors to request.

§response_channel: Sender<Result<Vec<H256>, ChainApiError>>

The response channel.

Trait Implementations§

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impl AssociateOutgoing for ChainApiMessage

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type OutgoingMessages = ChainApiOutgoingMessages

The associated outgoing messages for a subsystem that consumes the message Self.
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impl Debug for ChainApiMessage

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

Formats the value using the given formatter. Read more
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impl From<ChainApiMessage> for AllMessages

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fn from(message: ChainApiMessage) -> AllMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for ApprovalVotingOutgoingMessages

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fn from(message: ChainApiMessage) -> ApprovalVotingOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for ApprovalVotingParallelOutgoingMessages

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fn from(message: ChainApiMessage) -> ApprovalVotingParallelOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for AvailabilityDistributionOutgoingMessages

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fn from(message: ChainApiMessage) -> AvailabilityDistributionOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for AvailabilityStoreOutgoingMessages

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fn from(message: ChainApiMessage) -> AvailabilityStoreOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for CandidateBackingOutgoingMessages

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fn from(message: ChainApiMessage) -> CandidateBackingOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for CandidateValidationOutgoingMessages

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fn from(message: ChainApiMessage) -> CandidateValidationOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for ChainSelectionOutgoingMessages

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fn from(message: ChainApiMessage) -> ChainSelectionOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for CollatorProtocolOutgoingMessages

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fn from(message: ChainApiMessage) -> CollatorProtocolOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for DisputeCoordinatorOutgoingMessages

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fn from(message: ChainApiMessage) -> DisputeCoordinatorOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for ProspectiveParachainsOutgoingMessages

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fn from(message: ChainApiMessage) -> ProspectiveParachainsOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for ProvisionerOutgoingMessages

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fn from(message: ChainApiMessage) -> ProvisionerOutgoingMessages

Converts to this type from the input type.
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impl From<ChainApiMessage> for StatementDistributionOutgoingMessages

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fn from(message: ChainApiMessage) -> StatementDistributionOutgoingMessages

Converts to this type from the input type.
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impl TryFrom<AllMessages> for ChainApiMessage

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type Error = ()

The type returned in the event of a conversion error.
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fn try_from( message: AllMessages, ) -> Result<ChainApiMessage, <ChainApiMessage as TryFrom<AllMessages>>::Error>

Performs the conversion.

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