Quickstart
See the Rules Engine in action in minutes
This QuickStart will guide you through using the Forte Rules Engine in a local anvil development environment utilizing the Forte Rules Engine SDK. Following this guide, you will walk through the entire Forte Rules Engine workflow:
- Set up your environment
- Create a policy
- Integrate and deploy an example contract
- Apply the policy to the example contract
- Verify functionality
NOTE: This guide was developed in a MacOS environment, some modification may be necessary to suit a Linux/Windows environment.
1. Set up your environment
Environment dependencies
This guide assumes the following tools are installed and configured correctly. Please see each tool’s installation instructions for more details:
Build
Create a copy of our template repository in your own github account by navigating here: https://github.com/thrackle-io/fre-quickstart and clicking the “Use this template” button on GitHub.
Next, clone the freshly created repository to your local machine:
If you named the repository something different than fre-quickstart
, use that name in the clone
command instead.
Navigate to the repository in your local shell. To build the repository, run the following commands:
Start a local Anvil chain
An Anvil dumpState file is provided with a pre-deployed Rules Engine instance. Start the local Anvil instance in a terminal window with the following command:
Listening on 127.0.0.1:8545
should be the last thing displayed if the state file was successfuly loaded. Leave this Anvil instance running in this terminal for the rest of the quickstart. It may be restarted at any time but restarting will lose any on-chain progress you’ve made during the quickstart.
Configure your local environment
The .env.sample
environment file contains the values needed to continue this guide. Expand the Accordion below for more information.
Copy the sample environment file and then source the file to make those values available in your terminal.
The SDK utilizes the Rules Engine address and private key values from the environment file. This
requires that you name your file .env
, which enables the SDK to access the values.
2. Create a sample policy
To use the Rules engine, we must first create a policy. A default policy has been written for you within the policy.json that is tailored to work with the ExampleContract. To create this policy in the Rules Engine, run the following command:
Note the returned Policy Id, for this example the Policy Id should be 1, and create a local environment variable to store this Id for uses in subsequent commands:
This policy now exists, but no contracts are yet subscribed to it.
3. Integrate and deploy an example contract
The ExampleContract is a blank contract that conforms to a standard ERC20 interface transfer() function. The file does not store any data. The integration of the Rules Engine occurs by adding a modifier. This modifier may be generated by passing the policy information, destination modifier filename, and the example contract to the SDK. The SDK will process the policy, generate modifiers within the specified modifier file for each function within the Policy, and inject these newly generated modifiers within the supplied contract. This has been scripted in the index.ts with the following command:
After running this command, it will inject the beforeXXX() modifier within the function specified within the policy.json file. Verify the contract compiles and deploy the contract with the following commands:
Note the contract address, and export the address in your local terminal for subsequent testing.
4. Apply the policy to the example contract
The ExampleContract extends the RulesEngineClient to encapsulate storing the Rules Engine address and checks. It is recommended that all calling contracts extend this contract. This ensures calling contracts will only invoke the Rules Engine checks if the Rules Engine Address is specified. Set the Rules Engine Address in the ExampleContract via the following command:
First, we need to set the Rules Engine Address for the ExampleContract.
To verify the address was set correct, the following commmand should return the same Rules Engine Address:
Next, you need to set the Calling Contract Admin:
The last thing to do is to subscribe our example contract to the Policy we created.
5. Verify Functionality
Test Success Condition
You should receive a successful transaction!
Test Failure Condition
You should receive a revert with the text “Failed Test”