Trait trie_db::NodeCodec

pub trait NodeCodec<H: Hasher>: Sized {
    type Error: Error;
    fn hashed_null_node() -> H::Out;
    fn decode(data: &[u8]) -> Result<Node, Self::Error>;
    fn try_decode_hash(data: &[u8]) -> Option<H::Out>;
    fn is_empty_node(data: &[u8]) -> bool;
    fn empty_node() -> Vec<u8>;
    fn leaf_node(partial: &[u8], value: &[u8]) -> Vec<u8>;
    fn ext_node(partial: &[u8], child_ref: ChildReference<H::Out>) -> Vec<u8>;
    fn branch_node<I>(
        children: I, 
        value: Option<ElasticArray128<u8>>
    ) -> Vec<u8>
    where
        I: IntoIterator<Item = Option<ChildReference<H::Out>>> + Iterator<Item = Option<ChildReference<H::Out>>>;
}

Trait for trie node encoding/decoding

Associated Types

type Error: Error

Codec error type

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Required methods

fn hashed_null_node() -> H::Out

Get the hashed null node.

fn decode(data: &[u8]) -> Result<Node, Self::Error>

Decode bytes to a Node. Returns Self::E on failure.

fn try_decode_hash(data: &[u8]) -> Option<H::Out>

Decode bytes to the Hashers output type. Returns None on failure.

fn is_empty_node(data: &[u8]) -> bool

Check if the provided bytes correspond to the codecs "empty" node.

fn empty_node() -> Vec<u8>

Returns an empty node

fn leaf_node(partial: &[u8], value: &[u8]) -> Vec<u8>

Returns an encoded leaf node

fn ext_node(partial: &[u8], child_ref: ChildReference<H::Out>) -> Vec<u8>

Returns an encoded extension node

fn branch_node<I>(children: I, value: Option<ElasticArray128<u8>>) -> Vec<u8> where
    I: IntoIterator<Item = Option<ChildReference<H::Out>>> + Iterator<Item = Option<ChildReference<H::Out>>>, 

Returns an encoded branch node. Takes an iterator yielding ChildReference<H::Out> and an optional value

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Implementors

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