[−][src]Crate sp_trie

Utility functions to interact with Substrate's Base-16 Modified Merkle Patricia tree ("trie").

Modules

nibble_ops	Various re-exports from the `trie-db` crate. Utility methods to work on radix 16 nibble.
trie_types	This module is for non generic definition of trie type. Only the `Hasher` trait is generic in this case.

KeySpacedDB	`HashDB` implementation that append a encoded prefix (unique id bytes) in addition to the prefix of every key value.
KeySpacedDBMut	`HashDBMut` implementation that append a encoded prefix (unique id bytes) in addition to the prefix of every key value.
Layout	substrate trie layout
NodeCodec	Concrete implementation of a `NodeCodec` with Parity Codec encoding, generic over the `Hasher`
Recorder	Various re-exports from the `trie-db` crate. Records trie nodes as they pass it.
StorageProof	A proof that some set of key-value pairs are included in the storage trie. The proof contains the storage values so that the partial storage backend can be reconstructed by a verifier that does not already have access to the key-value pairs.
TrieDBIterator	Various re-exports from the `trie-db` crate. Iterator for going through all values in the trie in pre-order traversal order.
TrieStream	Codec-flavored TrieStream.

Error	Error for trie node decoding.
VerifyError	Errors that may occur during proof verification. Most of the errors types simply indicate that the proof is invalid with respect to the statement being verified, and the exact error type can be used for debugging.

Various re-exports from the hash-db crate. An empty prefix constant. Can be use when the prefix is not use internally or for root nodes.

AsHashDB	Reexport from `hash_db`, with genericity set for `Hasher` trait.
HashDBT	Various re-exports from the `hash-db` crate. Trait modelling datastore keyed by a hash defined by the `Hasher`.
KeyFunction	Various re-exports from the `memory-db` crate.
Query	Various re-exports from the `trie-db` crate. Description of what kind of query will be made to the trie.
Trie	Various re-exports from the `trie-db` crate. A key-value datastore implemented as a database-backed modified Merkle tree.
TrieConfiguration	Various re-exports from the `trie-db` crate. This trait associates a trie definition with preferred methods. It also contains own default implementations and can be used to allow switching implementation.
TrieLayout	Various re-exports from the `trie-db` crate. Trait with definition of trie layout. Contains all associated trait needed for a trie definition or implementation.
TrieMut	Various re-exports from the `trie-db` crate. A key-value datastore implemented as a database-backed modified Merkle tree.

child_delta_trie_root	Determine a child trie root given a hash DB and delta values. H is the default hasher, but a generic implementation may ignore this type parameter and use other hashers.
child_trie_root	Determine a child trie root given its ordered contents, closed form. H is the default hasher, but a generic implementation may ignore this type parameter and use other hashers.
delta_trie_root	Determine a trie root given a hash DB and delta values.
empty_child_trie_root	Determine the empty child trie root.
for_keys_in_child_trie	Call `f` for all keys in a child trie.
generate_trie_proof	Create a proof for a subset of keys in a trie.
prefixed_key	Derive a database key from hash value of the node (key) and the node prefix.
read_child_trie_value	Read a value from the child trie.
read_child_trie_value_with	Read a value from the child trie with given query.
read_trie_value	Read a value from the trie.
read_trie_value_with	Read a value from the trie with given Query.
record_all_keys	Record all keys for a given root.
verify_trie_proof	Verify a set of key-value pairs against a trie root and a proof.

CError	Various re-exports from the `trie-db` crate. Alias accessor to `NodeCodec` associated `Error` type from a `TrieLayout`.
DBValue	Various re-exports from the `trie-db` crate. Database value
GenericMemoryDB	Reexport from `hash_db`, with genericity set for `Hasher` trait.
HashDB	Reexport from `hash_db`, with genericity set for `Hasher` trait.
Lookup	Querying interface, as in `trie_db` but less generic.
MemoryDB	Reexport from `hash_db`, with genericity set for `Hasher` trait. This uses a noops `KeyFunction` (key addressing must be hashed or using an encoding scheme that avoid key conflict).
PrefixedMemoryDB	Reexport from `hash_db`, with genericity set for `Hasher` trait. This uses a `KeyFunction` for prefixing keys internally (avoiding key conflict for non random keys).
TrieDB	Persistent trie database read-access interface for the a given hasher.
TrieDBMut	Persistent trie database write-access interface for the a given hasher.
TrieError	TrieDB error over `TrieConfiguration` trait.
TrieHash	Hash type for a trie layout.