TrieWalker

reth_trie::walker

Struct TrieWalker 

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pub struct TrieWalker<C> {
    pub cursor: C,
    pub stack: Vec<CursorSubNode>,
    pub can_skip_current_node: bool,
    pub changes: PrefixSet,
    /* private fields */
}
Expand description

TrieWalker is a structure that enables traversal of a Merkle trie. It allows moving through the trie in a depth-first manner, skipping certain branches if they have not changed.

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§cursor: C

A mutable reference to a trie cursor instance used for navigating the trie.

§stack: Vec<CursorSubNode>

A vector containing the trie nodes that have been visited.

§can_skip_current_node: bool

A flag indicating whether the current node can be skipped when traversing the trie. This is determined by whether the current key’s prefix is included in the prefix set and if the hash flag is set.

§changes: PrefixSet

A PrefixSet representing the changes to be applied to the trie.

Implementations§

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impl<C> TrieWalker<C>

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pub fn state_trie_from_stack( cursor: C, stack: Vec<CursorSubNode>, changes: PrefixSet, ) -> Self

Constructs a new TrieWalker for the state trie from existing stack and a cursor.

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pub fn storage_trie_from_stack( cursor: C, stack: Vec<CursorSubNode>, changes: PrefixSet, ) -> Self

Constructs a new TrieWalker for the storage trie from existing stack and a cursor.

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pub fn with_deletions_retained(self, retained: bool) -> Self

Sets the flag whether the trie updates should be stored.

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pub fn split(self) -> (Vec<CursorSubNode>, HashSet<Nibbles>)

Split the walker into stack and trie updates.

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pub fn take_removed_keys(&mut self) -> HashSet<Nibbles>

Take removed keys from the walker.

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pub fn print_stack(&self)

Prints the current stack of trie nodes.

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pub fn removed_keys_len(&self) -> usize

The current length of the removed keys.

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pub fn key(&self) -> Option<&Nibbles>

Returns the current key in the trie.

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pub fn hash(&self) -> Option<B256>

Returns the current hash in the trie, if any.

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pub fn maybe_hash(&self) -> Option<B256>

Returns the current hash in the trie, if any.

Differs from Self::hash in that it returns None if the subnode is positioned at the child without a hash mask bit set. Self::hash panics in that case.

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pub fn children_are_in_trie(&self) -> bool

Indicates whether the children of the current node are present in the trie.

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pub fn next_unprocessed_key(&self) -> Option<(B256, Nibbles)>

Returns the next unprocessed key in the trie along with its raw Nibbles representation.

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impl<C: TrieCursor> TrieWalker<C>

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pub fn state_trie(cursor: C, changes: PrefixSet) -> Self

Constructs a new TrieWalker for the state trie.

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pub fn storage_trie(cursor: C, changes: PrefixSet) -> Self

Constructs a new TrieWalker for the storage trie.

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pub fn advance(&mut self) -> Result<(), DatabaseError>

Advances the walker to the next trie node and updates the skip node flag. The new key can then be obtained via key().

§Returns
  • Result<(), Error> - Unit on success or an error.

Trait Implementations§

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impl<C: Debug> Debug for TrieWalker<C>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<C> Freeze for TrieWalker<C>
where C: Freeze,

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impl<C> !RefUnwindSafe for TrieWalker<C>

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impl<C> Send for TrieWalker<C>
where C: Send,

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impl<C> Sync for TrieWalker<C>
where C: Sync,

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impl<C> Unpin for TrieWalker<C>
where C: Unpin,

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impl<C> !UnwindSafe for TrieWalker<C>

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