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Note about lookup

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Gav
2023-10-27 15:20:18 +01:00
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@@ -237,8 +237,15 @@ Both `refine` and `is_authorized` are only ever executed in-core. Within this en
Several host functions (largely in line with the host functions available to Parachain Validation Function code) are supplied. One addition is:
```rust
/// Determine the preimage of `hash` utilizing the Relay-chain Storage pallet.
fn lookup(hash: [u8; 32]) -> Vec<u8>;
/// Determine the preimage of `hash` utilizing the Relay-chain Storage pallet. This must
/// always do the same thing for the same `context` regardless of the current state of the
/// chain. This is achieved through the usage (by the host) of the specialized Storage
/// pallet.
///
/// It returns `u32::max_value()` in the case that the preimage is unavailable. Otherwise
/// it returns the length of the preimage and places the first bytes of the preimage into
/// `buffer`, up to a maximum of `buffer_len`.
fn lookup(hash: [u8; 32], buffer: *mut u8, buffer_len: u32) -> u32;
```
Other host functions will allow for the possibility of executing a WebAssembly payload (for example, a Parachain Validation Function) or instantiating and entering a subordinate RISCV VM (for example for Actor Progressions).