Struct cosmwasm_vm::Instance

pub struct Instance<A: BackendApi, S: Storage, Q: Querier> { /* fields omitted */ }

Implementations

impl<A, S, Q> Instance<A, S, Q> where
    A: BackendApi + 'static,
    S: Storage + 'static,
    Q: Querier + 'static, 

pub fn from_code(
    code: &[u8],
    backend: Backend<A, S, Q>,
    options: InstanceOptions,
    memory_limit: Option<Size>
) -> VmResult<Self>

This is the only Instance constructor that can be called from outside of cosmwasm-vm, e.g. in test code that needs a customized variant of cosmwasm_vm::testing::mock_instance*.

pub fn api(&self) -> &A

pub fn recycle(self) -> Option<Backend<A, S, Q>>

Decomposes this instance into its components. External dependencies are returned for reuse, the rest is dropped.

pub fn required_features(&self) -> HashSet<String>

Returns the features required by this contract.

This is not needed for production because we can do static analysis on the Wasm file before instatiation to obtain this information. It’s only kept because it can be handy for integration testing.

pub fn memory_pages(&self) -> usize

Returns the size of the default memory in pages. This provides a rough idea of the peak memory consumption. Note that Wasm memory always grows in 64 KiB steps (pages) and can never shrink (https://github.com/WebAssembly/design/issues/1300#issuecomment-573867836).

pub fn get_gas_left(&self) -> u64

Returns the currently remaining gas.

pub fn create_gas_report(&self) -> GasReport

Creates and returns a gas report. This is a snapshot and multiple reports can be created during the lifetime of an instance.

pub fn set_storage_readonly(&mut self, new_value: bool)

Sets the readonly storage flag on this instance. Since one instance can be used for multiple calls in integration tests, this should be set to the desired value right before every call.

pub fn with_storage<F: FnOnce(&mut S) -> VmResult<T>, T>(
    &mut self,
    func: F
) -> VmResult<T>

pub fn with_querier<F: FnOnce(&mut Q) -> VmResult<T>, T>(
    &mut self,
    func: F
) -> VmResult<T>