Struct MessageQueueChain

pub struct MessageQueueChain(/* private fields */);

This struct provides ability to extend a message queue chain (MQC) and compute a new head.

MQC is an instance of a hash chain applied to a message queue. Using a hash chain it’s possible to represent a sequence of messages using only a single hash.

A head for an empty chain is agreed to be a zero hash.

An instance is used to track either DMP from the relay chain or HRMP across a channel. But a given instance is never used to track both. Therefore, you should call either extend_downward or extend_hrmp, but not both methods on a single instance.

Implementations

impl MessageQueueChain

pub fn new(hash: RelayHash) -> Self

Create a new instance initialized to hash.

pub fn extend_with_hashed_msg( &mut self, hashed_msg: &HashedMessage, ) -> &mut Self

Extend the hash chain with a HashedMessage.

pub fn extend_hrmp( &mut self, horizontal_message: &InboundHrmpMessage, ) -> &mut Self

Extend the hash chain with an HRMP message. This method should be used only when this chain is tracking HRMP.

pub fn extend_downward( &mut self, downward_message: &InboundDownwardMessage, ) -> &mut Self

Extend the hash chain with a downward message. This method should be used only when this chain is tracking DMP.

pub fn head(&self) -> RelayHash

Return the current head of the message queue chain. This is agreed to be the zero hash for an empty chain.

Trait Implementations

impl Clone for MessageQueueChain

fn clone(&self) -> MessageQueueChain

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Decode for MessageQueueChain

fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Self, Error>

Attempt to deserialise the value from input.

fn decode_into<I>( input: &mut I, dst: &mut MaybeUninit<Self>, ) -> Result<DecodeFinished, Error>

where I: Input,

Attempt to deserialize the value from input into a pre-allocated piece of memory.

fn skip<I>(input: &mut I) -> Result<(), Error>

where I: Input,

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Default for MessageQueueChain

fn default() -> MessageQueueChain

Returns the “default value” for a type.

impl Encode for MessageQueueChain

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode_to<__CodecOutputEdqy: Output + ?Sized>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy, )

Convert self to a slice and append it to the destination.

fn encode(&self) -> Vec<u8>

Convert self to an owned vector.

fn using_encoded<__CodecOutputReturn, __CodecUsingEncodedCallback: FnOnce(&[u8]) -> __CodecOutputReturn>( &self, f: __CodecUsingEncodedCallback, ) -> __CodecOutputReturn

Convert self to a slice and then invoke the given closure with it.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl TypeInfo for MessageQueueChain

type Identity = MessageQueueChain

The type identifying for which type info is provided.

fn type_info() -> Type

Returns the static type identifier for Self.

impl EncodeLike for MessageQueueChain