Struct MemoryStorage 

pub struct MemoryStorage { /* private fields */ }

In-memory storage backend for testing and development.

Uses a BTreeMap to store slot values in memory. This enables fast, isolated unit tests without requiring a WASM runtime or blockchain.

Example

use truthlinked_sdk::backend::MemoryStorage;

let mut storage = MemoryStorage::new()
    .with_slot([1u8; 32], [42u8; 32])
    .with_slot([2u8; 32], [99u8; 32]);

let snapshot = storage.snapshot(); // Clone current state

Implementations

impl MemoryStorage

pub fn new() -> Self

Creates a new empty in-memory storage backend.

pub fn with_slot(self, key: [u8; 32], value: [u8; 32]) -> Self

Builder method to pre-populate a storage slot.

Useful for setting up test fixtures with initial state.

Arguments

• key - Storage slot address
• value - Initial value for the slot

Example

let storage = MemoryStorage::new()
    .with_slot([1u8; 32], [42u8; 32]);

pub fn snapshot(&self) -> BTreeMap<[u8; 32], [u8; 32]>

Creates a snapshot of the current storage state.

Returns a clone of the internal slot map. Useful for:

• Saving state before mutations
• Comparing state changes in tests
• Debugging storage operations

Returns

A BTreeMap containing all current slot values.

Trait Implementations

impl Clone for MemoryStorage

fn clone(&self) -> MemoryStorage

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MemoryStorage

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

Formats the value using the given formatter.

impl Default for MemoryStorage

fn default() -> MemoryStorage

Returns the “default value” for a type.

impl StorageBackend for MemoryStorage

fn read_32(&self, key: &[u8; 32]) -> Result<[u8; 32]>

Reads a 32-byte value from the specified storage slot.

fn write_32(&mut self, key: [u8; 32], value: [u8; 32]) -> Result<()>

Writes a 32-byte value to the specified storage slot.