pub struct TrieBackend<S: TrieBackendStorage<H>, H: Hasher, C = LocalTrieCache<H>> { /* private fields */ }
Expand description

Patricia trie-based backend. Transaction type is an overlay of changes to commit.

Implementations

Copy the state, with applied updates

Insert values into backend trie.

Merge trie nodes into this backend.

Apply the given transaction to this backend and set the root to the given value.

Compare with another in-memory backend.

Get backend essence reference.

Get backend storage reference.

Get trie root.

Consumes self and returns underlying storage.

Extract the StorageProof.

This only returns Some when there was a recorder set.

Trait Implementations

Type of trie backend storage.
Return the type as TrieBackend.
An error type when fetching data is not possible.
Storage changes to be applied if committing
Type of trie backend storage.
Get keyed storage value hash or None if there is nothing associated.
Get keyed storage or None if there is nothing associated.
Get child keyed storage value hash or None if there is nothing associated.
Get keyed child storage or None if there is nothing associated.
Return the next key in storage in lexicographic order or None if there is no value.
Return the next key in child storage in lexicographic order or None if there is no value.
Retrieve all entries keys which start with the given prefix and call f for each of those keys. Read more
Retrieve all entries keys and values of which start with the given prefix and call f for each of those keys. Read more
Iterate over storage starting at key, for a given prefix and child trie. Aborts as soon as f returns false. Warning, this fails at first error when usual iteration skips errors. If allow_missing is true, iteration stops when it reaches a missing trie node. Otherwise an error is produced. Read more
Retrieve all entries keys of storage and call f for each of those keys. Aborts as soon as f returns false. Read more
Retrieve all child entries keys which start with the given prefix and call f for each of those keys. Read more
Get all key/value pairs into a Vec.
Get all keys with given prefix
Calculate the storage root, with given delta over what is already stored in the backend, and produce a “transaction” that can be used to commit. Does not include child storage updates. Read more
Calculate the child storage root, with given delta over what is already stored in the backend, and produce a “transaction” that can be used to commit. The second argument is true if child storage root equals default storage root. Read more
Register stats from overlay of state machine. Read more
Query backend usage statistics (i/o, memory) Read more
Wipe the state database.
true if a key exists in storage.
true if a key exists in child storage.
Get all keys of child storage with given prefix
Calculate the storage root, with given delta over what is already stored in the backend, and produce a “transaction” that can be used to commit. Does include child storage updates. Read more
Commit given transaction to storage.
Get the read/write count of the db
Get the read/write count of the db
Get the whitelist for tracking db reads/writes
Update the whitelist for tracking db reads/writes
Estimate proof size
Extend storage info for benchmarking db
Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.
Converts to this type from the input type.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more
Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more
Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more
Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more
Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Get a reference to the inner from the outer.

Get a mutable reference to the inner from the outer.

The alignment of pointer.
The type for initializers.
Initializes a with the given initializer. Read more
Dereferences the given pointer. Read more
Mutably dereferences the given pointer. Read more
Drops the object pointed to by the given pointer. Read more
Should always be Self
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.
The counterpart to unchecked_from.
Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more