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Overview

Each round has an associated RandomData struct containing a randomness value, a signature, and the previous signature. The contract provides methods for setting random values and retrieving random values for a given round.

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Setup

1

Clone the repository

git clone https://github.com/diadata-org/dia-wasm-oracle.git
cd dia-wasm-oracle/random-wasm-oracle
2

Install required tools and dependencies

cargo install --force --git https://github.com/paritytech/cargo-contract.git
rustup component add rust-src --toolchain nightly
rustup target add wasm32-unknown-unknown --toolchain nightly

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Usage

1

Build the contract

cargo +nightly contract build
2

Deploy contract using this UI

https://contracts-ui.substrate.io/

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Example

To use the RandomOracle contract in your own project, follow these steps:

1

In your own project, add the random-wasm-oracle as a dependency. Open your project’s Cargo.toml and add the following:

[dependencies]
random-wasm-oracle = { path = "path/to/dia-wasm-oracle/random-wasm-oracle" }
2

In your project’s smart contract, import the necessary modules and types from the random-wasm-oracle crate:

use randomoracle::RandomOracleRef;
3

In your contract’s storage, add a RandomOracleRef field:

#[ink(storage)]
pub struct YourContract {
    // Your other fields...
    random_oracle: RandomOracleRef,
}
4

In your contract’s constructor, add a parameter for the RandomOracle contract’s address and initialize the RandomOracleRef:

#[ink(constructor)]
pub fn new(random_oracle: AccountId) -> Self {
    Self {
        // Initialize your other fields...
        random_oracle: RandomOracleRef::from_account_id(random_oracle),
    }
}
5

Implement methods to interact with the RandomOracle contract, e.g., getting random values for a specific round:

#[ink(message)]
pub fn get_random_value_for_round(&self, round: Vec<u8>) -> Vec<u8> {
    self.random_oracle.get_random_value_for_round(round)
}
6

Build and deploy your contract, providing the RandomOracle contract’s address https://shibuya.subscan.io/account/Y9YVxsyH8bza5zyK1AVW4iw1r7twVdoXMoDzWwdwraapvSM when instantiating your contract.

7

Interact with your contract to call the methods that use the RandomOracle contract.