Geth Smart Contract

This guide provides tutorials for using Geth to deploy and interact with smart contracts.

Prerequisite

• Golang
• Docker

1. Generate the ABI and BIN

We can use solc or tools like Hardhat or Foundry to generate the ABI and BIN files for our contracts.

Using solc

1. Download solc using solc-select:

   git clone https://github.com/crytic/solc-select.git
   cd solc-select
   ./solc-select install

2. Install the desired Solidity version:

   solc-select use 0.8.26 --always-install

3. Navigate to the contract folder and run the command to generate the ABI and BIN files:

   solc --abi --bin -o build Storage.sol

2. Generate Go Files for Contract Deployment and Interaction

1. Install the go-ethereum package, which is required for the abigen tool:

   go get github.com/ethereum/go-ethereum

2. Install the abigen tool:

    go install github.com/ethereum/go-ethereum/cmd/abigen@latest

3. Create a folder named storage for our Go package:

   mkdir storage
   cd storage

4. Run the abigen command in the storage folder to generate the Go files for the storage package:

   abigen --abi=../contract/build/Storage.abi --bin=../contract/build/Storage.bin --pkg=storage --out=storage.go

3. Contract Deployment and Interaction

The generated storage.go file provides the DeployStorage() function to deploy the contract, as well as functions to interact with it.

To call the store() function in the Storage contract, use the generated Store() function in the storage.go file.

Refer to the example in storage/storage_test.go for contract deployment and interaction. In this test, we use Anvil to start a local ethereum testnet node. Ensure you have Foundry installed before running the test:

make test

Notes

• Testcontainers is used for the tests. so we need to start docker before running the tests.
• The Testcontainers fetches the the foundry docker image from ghcr.io/foundry-rs/foundry. The fetch may fail with error no matching manifest for linux/arm64/v8 in the manifest list entries on Apple Silicon chips. You may need to manully pull the image with docker pull ghcr.io/foundry-rs/foundry --platform linux/x86_64 first if you are on a Apple Silicon Chip and encountered the error.
• Run make clean if you encounter any Go module or package load errors.