Struct fuel_vm::storage::ContractsState

pub struct ContractsState;

The storage table for contract’s hashed key-value state.

Lifetime is for optimization to avoid clone.

Trait Implementations

impl Mappable for ContractsState

type OwnedKey = ContractsStateKey

The table key is combination of the ContractId and Bytes32 hash of the value’s key.

type Key = <ContractsState as Mappable>::OwnedKey

The key type is used during interaction with the storage. In most cases, it is the same as Self::OwnedKey.

type OwnedValue = ContractsStateData

The owned type of the Value retrieving from the storage.

type Value = [u8]

The value type is used while setting the value to the storage. In most cases, it is the same as Self::OwnedValue, but it is without restriction and can be used for performance optimizations.

impl StorageInspect<ContractsState> for MemoryStorage

type Error = Infallible

fn get( &self, key: &<ContractsState as Mappable>::Key, ) -> Result<Option<Cow<'_, <ContractsState as Mappable>::OwnedValue>>, Infallible>

Retrieve Cow<Value> such as Key->Value.

fn contains_key( &self, key: &<ContractsState as Mappable>::Key, ) -> Result<bool, Infallible>

Return true if there is a Key mapping to a value in the storage.

impl StorageMutate<ContractsState> for MemoryStorage

fn insert( &mut self, key: &<ContractsState as Mappable>::Key, value: &<ContractsState as Mappable>::Value, ) -> Result<Option<<ContractsState as Mappable>::OwnedValue>, Infallible>

Append Key->Value mapping to the storage.

fn remove( &mut self, key: &<ContractsState as Mappable>::Key, ) -> Result<Option<ContractsStateData>, Infallible>

Remove Key->Value mapping from the storage.

impl StorageRead<ContractsState> for MemoryStorage

fn read( &self, key: &<ContractsState as Mappable>::Key, buf: &mut [u8], ) -> Result<Option<usize>, Self::Error>

Read the value stored at the given key into the provided buffer if the value exists.

fn read_alloc( &self, key: &<ContractsState as Mappable>::Key, ) -> Result<Option<Vec<u8>>, Self::Error>

Same as read but allocates a new buffer and returns it.

impl StorageRead<ContractsState> for PredicateStorage

fn read( &self, _key: &<ContractsState as Mappable>::Key, _buf: &mut [u8], ) -> Result<Option<usize>, StorageUnavailable>

Read the value stored at the given key into the provided buffer if the value exists.

fn read_alloc( &self, _key: &<ContractsState as Mappable>::Key, ) -> Result<Option<Vec<u8>>, StorageUnavailable>

Same as read but allocates a new buffer and returns it.

impl StorageSize<ContractsState> for MemoryStorage

fn size_of_value( &self, key: &<ContractsState as Mappable>::Key, ) -> Result<Option<usize>, Infallible>

Return the number of bytes stored at this key.

impl StorageSize<ContractsState> for PredicateStorage

fn size_of_value( &self, _key: &<ContractsState as Mappable>::Key, ) -> Result<Option<usize>, StorageUnavailable>

Return the number of bytes stored at this key.

impl StorageWrite<ContractsState> for MemoryStorage

fn write( &mut self, key: &<ContractsState as Mappable>::Key, buf: &[u8], ) -> Result<usize, Infallible>

Write the value to the given key from the provided buffer.

fn replace( &mut self, key: &<ContractsState as Mappable>::Key, buf: &[u8], ) -> Result<(usize, Option<Vec<u8>>), Self::Error>

where Self: StorageSize<ContractsState>,

Write the value to the given key from the provided buffer and return the previous value if it existed.

fn take( &mut self, key: &<ContractsState as Mappable>::Key, ) -> Result<Option<Vec<u8>>, Self::Error>

Removes a value from the storage and returning it without deserializing it.

impl StorageWrite<ContractsState> for PredicateStorage

fn write( &mut self, _key: &<ContractsState as Mappable>::Key, _buf: &[u8], ) -> Result<usize, Self::Error>

Write the value to the given key from the provided buffer.

fn replace( &mut self, _key: &<ContractsState as Mappable>::Key, _buf: &[u8], ) -> Result<(usize, Option<Vec<u8>>), Self::Error>

Write the value to the given key from the provided buffer and return the previous value if it existed.

fn take( &mut self, _key: &<ContractsState as Mappable>::Key, ) -> Result<Option<Vec<u8>>, Self::Error>

Removes a value from the storage and returning it without deserializing it.