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VRF Consumer

The Smart Contract VrfConsumer, deployed on Astar Network (or testnet):

  1. Registers a request to get a random value between min and max values
  2. Sends the request into the message queue that will be consumed by the Phat Contract VrfOracle deployed on Phala Network (or testnet)
  3. Listens the reply to the Phat Contract VrfOracle with the generated random value. The Ink! Smart Contract checks if the attestor (ie the phat contract) is granted and if the hash of the source code used to compute the random value is correct.
  4. Saves the random value to be displayed in the UI.

It uses the crate phat_rollup_anchor_ink and supports the following operations:

  • configure the attestor(s) authorized to send the random value. Only an address granted as MANAGER can do it.
  • send a request to get a random value between min and max values. All users can do it.
  • handle the messages to provide the random value. Only an address granted as ATTESTOR can do it.
  • display the last random value received by requestor.
  • allow meta transactions to separate the attestor and the payer.
  • manage the roles and grant an address as ADMIN, MANAGER, ATTESTOR. Only the admin can do it.

By default, the contract owner is granted as ADMIN and MANAGER but it is not granted as ATTESTOR.

Build

To build the contract:

cargo contract build

Run e2e tests

Before you can run the test, you have to install a Substrate node with pallet-contracts. By default, e2e tests require that you install substrate-contracts-node. You do not need to run it in the background since the node is started for each test independently. To install the latest version:

cargo install contracts-node --git https://github.com/paritytech/substrate-contracts-node.git

If you want to run any other node with pallet-contracts you need to change CONTRACTS_NODE environment variable:

export CONTRACTS_NODE="YOUR_CONTRACTS_NODE_PATH"

And finally execute the following command to start e2e tests execution.

cargo test --features e2e-tests