Trait casper_execution_engine::storage::global_state::StateReader

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pub trait StateReader<K, V> {
    type Error;

    // Required methods
    fn read(
        &self,
        correlation_id: CorrelationId,
        key: &K
    ) -> Result<Option<V>, Self::Error>;
    fn read_with_proof(
        &self,
        correlation_id: CorrelationId,
        key: &K
    ) -> Result<Option<TrieMerkleProof<K, V>>, Self::Error>;
    fn keys_with_prefix(
        &self,
        correlation_id: CorrelationId,
        prefix: &[u8]
    ) -> Result<Vec<K>, Self::Error>;
}
Expand description

A trait expressing the reading of state. This trait is used to abstract the underlying store.

Required Associated Types§

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type Error

An error which occurs when reading state

Required Methods§

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fn read( &self, correlation_id: CorrelationId, key: &K ) -> Result<Option<V>, Self::Error>

Returns the state value from the corresponding key

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fn read_with_proof( &self, correlation_id: CorrelationId, key: &K ) -> Result<Option<TrieMerkleProof<K, V>>, Self::Error>

Returns the merkle proof of the state value from the corresponding key

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fn keys_with_prefix( &self, correlation_id: CorrelationId, prefix: &[u8] ) -> Result<Vec<K>, Self::Error>

Returns the keys in the trie matching prefix.

Implementors§