README.md

Function Value

This repository demonstrates testing of Move 2 "function value" (function pointer) features with a simple VRF-like request/response flow.

Structure

• function_value/supra_vrf/
  • Move.toml
  • sources/supra_vrf.move — VRF admin module (emits RngRequest events, stores client callback, and calls callback with randomness).
• function_value/client/
  • Move.toml
  • sources/client.move — example client module that requests randomness and implements a persistent callback.
  • tests/client_test.move — unit test exercising the full flow.

What it demonstrates

• Using function values / function pointers to store a client callback on-chain: see supra_addr::supra_vrf::StoreClientFun and client_addr::client::callback_function.
• Emitting events for off-chain relayers: supra_addr::supra_vrf::RngRequest.
• Simple on-chain request nonce management: supra_addr::supra_vrf::VRFConfig.
• Using smart_table::SmartTable in the client for nonce -> random value storage: client_addr::client::RandomNumber.

Notes / Suggested improvements

• Decide whether callbacks should be updated/overwritten per-request or stored per-nonce to support multiple outstanding requests per client. See supra_addr::supra_vrf::rng_request and supra_addr::supra_vrf::StoreClientFun.

Compile Code

• Run client tests:

aptos move compile --package-dir supra_vrf

aptos move compile --package-dir client

Run tests

Use your Aptos/Move toolchain to run package unit tests. Example (tooling may vary):

• Run client tests:

aptos move test --package-dir client