Struct darkfi::runtime::vm_runtime::Env

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pub struct Env {
Show 14 fields pub blockchain: BlockchainOverlayPtr, pub db_handles: RefCell<Vec<DbHandle>>, pub contract_id: ContractId, pub contract_bincode: Vec<u8>, pub contract_section: ContractSection, pub contract_return_data: Cell<Option<Vec<u8>>>, pub logs: RefCell<Vec<String>>, pub memory: Option<Memory>, pub objects: RefCell<Vec<Vec<u8>>>, pub verifying_block_height: u32, pub block_target: u32, pub tx_hash: TransactionHash, pub call_idx: u8, pub instance: Option<Arc<Instance>>,
}
Expand description

The WASM VM runtime environment instantiated for every smart contract that runs.

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§blockchain: BlockchainOverlayPtr

Blockchain overlay access

§db_handles: RefCell<Vec<DbHandle>>

Overlay tree handles used with db_*

§contract_id: ContractId

The contract ID being executed

§contract_bincode: Vec<u8>

The compiled wasm bincode being executed,

§contract_section: ContractSection

The contract section being executed

§contract_return_data: Cell<Option<Vec<u8>>>

State update produced by a smart contract function call

§logs: RefCell<Vec<String>>

Logs produced by the contract

§memory: Option<Memory>

Direct memory access to the VM

§objects: RefCell<Vec<Vec<u8>>>

Object store for transferring memory from the host to VM

§verifying_block_height: u32

Block height number runtime verifies against. For unconfirmed txs, this will be the current max height in the chain.

§block_target: u32

Currently configured block time target, in seconds

§tx_hash: TransactionHash

The hash for this transaction the runtime is being run against.

§call_idx: u8

The index for this call in the transaction

§instance: Option<Arc<Instance>>

Parent Instance

Implementations§

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impl Env

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pub fn memory_view<'a>(&'a self, store: &'a impl AsStoreRef) -> MemoryView<'a>

Provide safe access to the memory (it must be initialized before it can be used)

// ctx: FunctionEnvMut<Env>
let env = ctx.data();
let memory = env.memory_view(&ctx);
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pub fn memory(&self) -> &Memory

Get memory, that needs to have been set fist

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pub fn subtract_gas(&mut self, ctx: &mut impl AsStoreMut, gas: u64)

Subtract given gas cost from remaining gas in the current runtime

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impl !Freeze for Env

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impl !RefUnwindSafe for Env

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impl Send for Env

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impl !Sync for Env

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impl Unpin for Env

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impl UnwindSafe for Env

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