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

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

Implementations§

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impl<H: Hasher> TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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pub fn update<T: IntoIterator<Item = (Option<ChildInfo>, StorageCollection)>>( &self, changes: T, state_version: StateVersion ) -> Self

Copy the state, with applied updates

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pub fn insert<T: IntoIterator<Item = (Option<ChildInfo>, StorageCollection)>>( &mut self, changes: T, state_version: StateVersion )

Insert values into backend trie.

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pub fn update_backend(&self, root: H::Out, changes: PrefixedMemoryDB<H>) -> Self

Merge trie nodes into this backend.

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pub fn apply_transaction( &mut self, root: H::Out, transaction: PrefixedMemoryDB<H> )

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

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pub fn eq(&self, other: &Self) -> bool

Compare with another in-memory backend.

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impl<S: TrieBackendStorage<H>, H: Hasher, C: TrieCacheProvider<H> + Send + Sync, R: TrieRecorderProvider<H> + Send + Sync> TrieBackend<S, H, C, R>where H::Out: Codec,

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pub fn essence(&self) -> &TrieBackendEssence<S, H, C, R>

Get backend essence reference.

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pub fn backend_storage_mut(&mut self) -> &mut S

Get backend storage reference.

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pub fn backend_storage(&self) -> &S

Get backend storage reference.

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pub fn set_root(&mut self, root: H::Out)

Set trie root.

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pub fn root(&self) -> &H::Out

Get trie root.

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pub fn into_storage(self) -> S

Consumes self and returns underlying storage.

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pub fn extract_proof(self) -> Option<StorageProof>

Extract the StorageProof.

This only returns Some when there was a recorder set.

Trait Implementations§

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impl<S: TrieBackendStorage<H>, H: Hasher, C> AsTrieBackend<H, C> for TrieBackend<S, H, C>

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type TrieBackendStorage = S

Type of trie backend storage.
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fn as_trie_backend(&self) -> &TrieBackend<S, H, C>

Return the type as TrieBackend.
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impl<S: TrieBackendStorage<H>, H: Hasher, C: TrieCacheProvider<H> + Send + Sync, R: TrieRecorderProvider<H> + Send + Sync> Backend<H> for TrieBackend<S, H, C, R>where H::Out: Ord + Codec,

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type Error = String

An error type when fetching data is not possible.
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type TrieBackendStorage = S

Type of trie backend storage.
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type RawIter = RawIter<S, H, C, R>

Type of the raw storage iterator.
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fn storage_hash(&self, key: &[u8]) -> Result<Option<H::Out>, Self::Error>

Get keyed storage value hash or None if there is nothing associated.
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fn storage(&self, key: &[u8]) -> Result<Option<StorageValue>, Self::Error>

Get keyed storage or None if there is nothing associated.
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fn child_storage_hash( &self, child_info: &ChildInfo, key: &[u8] ) -> Result<Option<H::Out>, Self::Error>

Get child keyed storage value hash or None if there is nothing associated.
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fn child_storage( &self, child_info: &ChildInfo, key: &[u8] ) -> Result<Option<StorageValue>, Self::Error>

Get child keyed child storage or None if there is nothing associated.
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fn closest_merkle_value( &self, key: &[u8] ) -> Result<Option<MerkleValue<H::Out>>, Self::Error>

Get the merkle value or None if there is nothing associated.
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fn child_closest_merkle_value( &self, child_info: &ChildInfo, key: &[u8] ) -> Result<Option<MerkleValue<H::Out>>, Self::Error>

Get the child merkle value or None if there is nothing associated.
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fn next_storage_key( &self, key: &[u8] ) -> Result<Option<StorageKey>, Self::Error>

Return the next key in storage in lexicographic order or None if there is no value.
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fn next_child_storage_key( &self, child_info: &ChildInfo, key: &[u8] ) -> Result<Option<StorageKey>, Self::Error>

Return the next key in child storage in lexicographic order or None if there is no value.
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fn raw_iter(&self, args: IterArgs<'_>) -> Result<Self::RawIter, Self::Error>

Returns a lifetimeless raw storage iterator.
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fn storage_root<'a>( &self, delta: impl Iterator<Item = (&'a [u8], Option<&'a [u8]>)>, state_version: StateVersion ) -> (H::Out, PrefixedMemoryDB<H>)where H::Out: Ord,

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.
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fn child_storage_root<'a>( &self, child_info: &ChildInfo, delta: impl Iterator<Item = (&'a [u8], Option<&'a [u8]>)>, state_version: StateVersion ) -> (H::Out, bool, PrefixedMemoryDB<H>)where H::Out: Ord,

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.
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fn register_overlay_stats(&self, _stats: &StateMachineStats)

Register stats from overlay of state machine. Read more
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fn usage_info(&self) -> UsageInfo

Query backend usage statistics (i/o, memory) Read more
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fn wipe(&self) -> Result<(), Self::Error>

Wipe the state database.
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fn exists_storage(&self, key: &[u8]) -> Result<bool, Self::Error>

true if a key exists in storage.
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fn exists_child_storage( &self, child_info: &ChildInfo, key: &[u8] ) -> Result<bool, Self::Error>

true if a key exists in child storage.
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fn pairs<'a>( &'a self, args: IterArgs<'_> ) -> Result<PairsIter<'a, H, Self::RawIter>, Self::Error>

Get an iterator over key/value pairs.
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fn keys<'a>( &'a self, args: IterArgs<'_> ) -> Result<KeysIter<'a, H, Self::RawIter>, Self::Error>

Get an iterator over keys.
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fn full_storage_root<'a>( &self, delta: impl Iterator<Item = (&'a [u8], Option<&'a [u8]>)>, child_deltas: impl Iterator<Item = (&'a ChildInfo, impl Iterator<Item = (&'a [u8], Option<&'a [u8]>)>)>, state_version: StateVersion ) -> (H::Out, BackendTransaction<H>)where H::Out: Ord + Encode,

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.
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fn commit( &self, _: H::Out, _: BackendTransaction<H>, _: StorageCollection, _: ChildStorageCollection ) -> Result<(), Self::Error>

Commit given transaction to storage.
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fn read_write_count(&self) -> (u32, u32, u32, u32)

Get the read/write count of the db
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fn reset_read_write_count(&self)

Get the read/write count of the db
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fn get_whitelist(&self) -> Vec<TrackedStorageKey>

Get the whitelist for tracking db reads/writes
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fn set_whitelist(&self, _: Vec<TrackedStorageKey>)

Update the whitelist for tracking db reads/writes
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fn proof_size(&self) -> Option<u32>

Estimate proof size
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fn get_read_and_written_keys(&self) -> Vec<(Vec<u8>, u32, u32, bool)>

Extend storage info for benchmarking db
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impl<H: Hasher> Clone for TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<S: TrieBackendStorage<H>, H: Hasher, C: TrieCacheProvider<H>, R: TrieRecorderProvider<H>> Debug for TrieBackend<S, H, C, R>

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

Formats the value using the given formatter. Read more
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impl<H> Default for TrieBackend<PrefixedMemoryDB<H>, H>where H: Hasher, H::Out: Codec + Ord,

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<H: Hasher> From<(BTreeMap<Vec<u8>, Vec<u8>>, StateVersion)> for TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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fn from( (inner, state_version): (BTreeMap<StorageKey, StorageValue>, StateVersion) ) -> Self

Converts to this type from the input type.
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impl<H: Hasher> From<(HashMap<Option<ChildInfo>, BTreeMap<Vec<u8>, Vec<u8>>>, StateVersion)> for TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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fn from( (inner, state_version): (HashMap<Option<ChildInfo>, BTreeMap<StorageKey, StorageValue>>, StateVersion) ) -> Self

Converts to this type from the input type.
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impl<H: Hasher> From<(Storage, StateVersion)> for TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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fn from((inners, state_version): (Storage, StateVersion)) -> Self

Converts to this type from the input type.
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impl<H: Hasher> From<(Vec<(Option<ChildInfo>, Vec<(Vec<u8>, Option<Vec<u8>>)>)>, StateVersion)> for TrieBackend<PrefixedMemoryDB<H>, H>where H::Out: Codec + Ord,

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fn from( (inner, state_version): (Vec<(Option<ChildInfo>, StorageCollection)>, StateVersion) ) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl<S, H, C = LocalTrieCache<H>, R = Recorder<H>> !RefUnwindSafe for TrieBackend<S, H, C, R>

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impl<S, H, C, R> Send for TrieBackend<S, H, C, R>where C: Send, R: Send,

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impl<S, H, C, R> Sync for TrieBackend<S, H, C, R>where C: Send + Sync, R: Send + Sync,

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impl<S, H, C, R> Unpin for TrieBackend<S, H, C, R>where C: Unpin, R: Unpin, S: Unpin, <H as Hasher>::Out: Unpin,

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impl<S, H, C = LocalTrieCache<H>, R = Recorder<H>> !UnwindSafe for TrieBackend<S, H, C, R>

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impl<T> Any for Twhere T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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impl<H, B> InspectState<H, B> for Bwhere H: Hasher, B: Backend<H>, <H as Hasher>::Out: Encode,

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Inspect state with a closure. Read more
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