Lilypad v0 Quick Start

Get Started with Lilypad v0 - Call off-chain distributed compute from your smart contract!

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Note: Since this video was released some changes have been made to the underlying code, but the process and general architecture remains the same.

Quick Start Guide

The Lilypad Contracts are not currently importable via npm (though this is in progress), so to import them to you own project, you'll need to use their github links

Using Lilypad in your own solidity smart contract requires the following steps

  1. Create a contract that implements the LilypadCaller interface.

    As part of this interface you need to implement 2 functions:

    • lilypadFulfilled - a callback function that will be called when the job completes successfully

    • lilypadCancelled - a callback function that will be called when the job fails

  2. Provide a public Docker Spec compatible for use on Bacalhau in JSON format to the contract.

  3. To trigger a job from your contract, you need to call the LilypadEvents contract which the Lilypad bridge is listening to and which connects to the Bacalhau public network. Create an instance of LilypadEvents by passing the public contract address on the network you are using (see Deployed Network Details) to the LilypadEvents constructor.

  4. Call the LilypadEvents contract function runLilypadJob() passing in the following parameters.

NameTypePurpose

_from

address

The address of the calling contract, to which success or failure will be passed back. You should probably use address(this) from your contract.

_spec

string

A Bacalhau job spec in JSON format. See below for more information on creating a job spec.

_resultType

LilypadResultType

The type of result that you want to be returned. If you specify CID, the result tree will come back as a retrievable IPFS CID. If you specify StdOut, StdErr or ExitCode, those raw values output from the job will be returned.

Implement the LilypadCaller Interface in your contract

Create a contract that implements LilypadCallerInterface. As part of this interface you need to implement 2 functions:

  • lilypadFulfilled - a callback function that will be called when the job completes successfully

  • lilypadCancelled - a callback function that will be called when the job fails

  /** === LilypadCaller Interface === **/
  pragma solidity >=0.8.4;
  import 'https://github.com/bacalhau-project/lilypad/blob/main/hardhat/contracts/LilypadCallerInterface.sol' //Location of file link

  /** === User Contract Example === **/
  contract MyContract is LilypadCallerInterface {

      function lilypadFulfilled(address _from, uint _jobId,   
          LilypadResultType _resultType, string calldata _result)        
          external override {
          // Do something when the LilypadEvents contract returns    
          // results successfully
      }

      function lilypadCancelled(address _from, uint _jobId, string 
          calldata _errorMsg) external override {
          // Do something if there's an error returned by the
          // LilypadEvents contract
      }
  }

Add a Spec compatible with Bacalhau

There are several public examples you can try out without needing to know anything about Docker or WASM specification jobs -> see the Bacalhau Docs. The full specification for Bacalhau jobs can be seen here.

Bacalhau operates by executing jobs within containers. This means it is able to run any arbitrary Docker jobs or WASM images

We'll use the public Stable Diffusion Docker Container located here for this example.

Here's an example JSON job specification for the Stable Diffusion job:

{
    "Engine": "docker", 
    "Verifier": "noop",
    "PublisherSpec": {"Type": "estuary"},
    "Docker": {
    "Image": "ghcr.io/bacalhau-project/examples/stable-diffusion-gpu:0.0.1",
    "Entrypoint": ["python", "main.py", "--o", "./outputs", "--p", "A User Prompt Goes here"]},
    "Resources": {"GPU": "1"},
    "Outputs": [{"Name": "outputs", "Path": "/outputs"}],
    "Deal": {"Concurrency": 1}
}

Here's an example of using this JSON specification in solidity:

Note that since we need to be able to add the user prompt input to the spec, it's been split into 2 parts.

string constant specStart = '{'
    '"Engine": "docker",'
    '"Verifier": "noop",'
    '"PublisherSpec": {"Type": "estuary"},'
    '"Docker": {'
    '"Image": "ghcr.io/bacalhau-project/examples/stable-diffusion-gpu:0.0.1",'
    '"Entrypoint": ["python", "main.py", "--o", "./outputs", "--p", "';

string constant specEnd =
    '"]},'
    '"Resources": {"GPU": "1"},'
    '"Outputs": [{"Name": "outputs", "Path": "/outputs"}],'
    '"Deal": {"Concurrency": 1}'
    '}';


//Example of use:
string memory spec = string.concat(specStart, _prompt, specEnd);

See more about how to onboard your Docker Workloads for Bacalhau, Onboard WebAssembly Workloads or Work with Custom Containers in the Bacalhau Docs.

Add the Lilypad Events Address & Network Fee

You can do this by either passing it into your constructor or setting it as a variable

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;
import "https://github.com/bacalhau-project/lilypad/blob/main/hardhat/contracts/LilypadEventsUpgradeable.sol";
import "https://github.com/bacalhau-project/lilypad/blob/main/hardhat/contracts/LilypadCallerInterface.sol";

/** === User Contract Example === **/
contract MyContract is LilypadCallerInterface {
  address public bridgeAddress; // LilypadEvents contract address for interacting with the deployed LilypadEvents contract
  LilypadEventsUpgradeable bridge; // Instance of the LilypadEvents Contract to interact with
  uint256 public lilypadFee; //=30000000000000000 on FVM;
  
  constructor(address _bridgeContractAddress) {
    bridgeAddress = _bridgeContractAddress; //the LilypadEvents contract address for your network
    bridge = LilypadEventsUpgradeable(_bridgeContractAddress); //create an instance of the Events Contract to interact with
    uint fee = bridge.getLilypadFee(); // you can fetch the fee amount required for the contract to run also
    lilypadFee = fee;
  }

  function lilypadFulfilled(address _from, uint _jobId,   
    LilypadResultType _resultType, string calldata _result)        
    external override {
    // Do something when the LilypadEvents contract returns    
    // results successfully
  }
  
  function lilypadCancelled(address _from, uint _jobId, string 
    calldata _errorMsg) external override {
    // Do something if there's an error returned by the Lilypad Job
  }
}

Call the LilypadEvents runLilypadJob function

Using the LilypadEvents Instance, we can now send jobs to the Bacalhau Network via our contract using the runLilypadJob() function.

In this example we'll use the Stable Diffusion Spec shown above in Add a Spec compatible with Bacalhau

Note that calling the runLilypadJob() function requires a network fee. While the Bacalhau public Network is currently free to use, gas fees are still needed to return the results of the job performed. This is the payable fee in the contract.

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;
import "https://github.com/bacalhau-project/lilypad/blob/main/hardhat/contracts/LilypadEventsUpgradeable.sol";
import "https://github.com/bacalhau-project/lilypad/blob/main/hardhat/contracts/LilypadCallerInterface.sol";

/** === User Contract Example === **/
contract MyContract is LilypadCallerInterface {
  address public bridgeAddress; // Variable for interacting with the deployed LilypadEvents contract
  LilypadEventsUpgradeable bridge;
  uint256 public lilypadFee; //=30000000000000000;
  
  constructor(address _bridgeContractAddress) {
    bridgeAddress = _bridgeContractAddress;
    bridge = LilypadEventsUpgradeable(_bridgeContractAddress);
    uint fee = bridge.getLilypadFee(); // you can fetch the fee amount required for the contract to run also
    lilypadFee = fee;
  }
  
  //** Define the Bacalhau Specification */
  string constant specStart = '{'
      '"Engine": "docker",'
      '"Verifier": "noop",'
      '"PublisherSpec": {"Type": "estuary"},'
      '"Docker": {'
      '"Image": "ghcr.io/bacalhau-project/examples/stable-diffusion-gpu:0.0.1",'
      '"Entrypoint": ["python", "main.py", "--o", "./outputs", "--p", "';

  string constant specEnd =
      '"]},'
      '"Resources": {"GPU": "1"},'
      '"Outputs": [{"Name": "outputs", "Path": "/outputs"}],'
      '"Deal": {"Concurrency": 1}'
      '}';
  

  /** Call the runLilypadJob() to generate a stable diffusion image from a text prompt*/
  function StableDiffusion(string calldata _prompt) external payable {
      require(msg.value >= lilypadFee, "Not enough to run Lilypad job");
      // TODO: spec -> do proper json encoding, look out for quotes in _prompt
      string memory spec = string.concat(specStart, _prompt, specEnd);
      uint id = bridge.runLilypadJob{value: lilypadFee}(address(this), spec, uint8(LilypadResultType.CID));
      require(id > 0, "job didn't return a value");
      prompts[id] = _prompt;
  }

  /** LilypadCaller Interface Implementation */
  function lilypadFulfilled(address _from, uint _jobId,   
    LilypadResultType _resultType, string calldata _result)        
    external override {
    // Do something when the LilypadEvents contract returns    
    // results successfully
  }
  
  function lilypadCancelled(address _from, uint _jobId, string 
    calldata _errorMsg) external override {
    // Do something if there's an error returned by the
    // LilypadEvents contract
  }
}
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