Struct trie_db::FatDB

pub struct FatDB<'db, 'cache, L>
where
    L: TrieLayout,
{ /* private fields */ }

A Trie implementation which hashes keys and uses a generic HashDB backing database. Additionaly it stores inserted hash-key mappings for later retrieval.

Use it as a Trie or TrieMut trait object.

Implementations

impl<'db, 'cache, L> FatDB<'db, 'cache, L>

where L: TrieLayout,

pub fn new( db: &'db dyn HashDBRef<L::Hash, DBValue>, root: &'db TrieHash<L> ) -> Self

Create a new trie with the backing database db and empty root Initialise to the state entailed by the genesis block. This guarantees the trie is built correctly.

pub fn db(&self) -> &dyn HashDBRef<L::Hash, DBValue>

Get the backing database.

Trait Implementations

impl<'db, 'cache, L> Trie<L> for FatDB<'db, 'cache, L>

where L: TrieLayout,

fn root(&self) -> &TrieHash<L>

Return the root of the trie.

fn contains(&self, key: &[u8]) -> Result<bool, TrieHash<L>, CError<L>>

Does the trie contain a given key?

fn get_hash( &self, key: &[u8] ) -> Result<Option<TrieHash<L>>, TrieHash<L>, CError<L>>

Returns the hash of the value for key.

fn get_with<Q: Query<L::Hash>>( &self, key: &[u8], query: Q ) -> Result<Option<Q::Item>, TrieHash<L>, CError<L>>

Search for the key with the given query parameter. See the docs of the Query trait for more details.

fn lookup_first_descendant( &self, key: &[u8] ) -> Result<Option<MerkleValue<TrieHash<L>>>, TrieHash<L>, CError<L>>

Look up the MerkleValue of the node that is the closest descendant for the provided key.

fn iter<'a>( &'a self ) -> Result<Box<dyn TrieIterator<L, Item = TrieItem<TrieHash<L>, CError<L>>> + 'a>, TrieHash<L>, CError<L>>

Returns a depth-first iterator over the elements of trie.

fn key_iter<'a>( &'a self ) -> Result<Box<dyn TrieIterator<L, Item = TrieKeyItem<TrieHash<L>, CError<L>>> + 'a>, TrieHash<L>, CError<L>>

Returns a depth-first iterator over the keys of elemets of trie.

fn is_empty(&self) -> bool

Is the trie empty?

fn get(&self, key: &[u8]) -> Result<Option<DBValue>, TrieHash<L>, CError<L>>

What is the value of the given key in this trie?