Example Solidity contract, ABI and Go bindings

Store.abi

[
    {
        "inputs": [],
        "name": "retrieve",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "uint256",
                "name": "num",
                "type": "uint256"
            }
        ],
        "name": "store",
        "outputs": [],
        "stateMutability": "nonpayable",
        "type": "function"
    }
]

Store.go

// Code generated - DO NOT EDIT.
// This file is a generated binding and any manual changes will be lost.

package store

import (
	"math/big"
	"strings"

	ethereum "github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/event"
)

// Reference imports to suppress errors if they are not otherwise used.
var (
	_ = big.NewInt
	_ = strings.NewReader
	_ = ethereum.NotFound
	_ = bind.Bind
	_ = common.Big1
	_ = types.BloomLookup
	_ = event.NewSubscription
)

// StoreABI is the input ABI used to generate the binding from.
const StoreABI = "[{\"inputs\":[],\"name\":\"retrieve\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"num\",\"type\":\"uint256\"}],\"name\":\"store\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]"

// Store is an auto generated Go binding around an Ethereum contract.
type Store struct {
	StoreCaller     // Read-only binding to the contract
	StoreTransactor // Write-only binding to the contract
	StoreFilterer   // Log filterer for contract events
}

// StoreCaller is an auto generated read-only Go binding around an Ethereum contract.
type StoreCaller struct {
	contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// StoreTransactor is an auto generated write-only Go binding around an Ethereum contract.
type StoreTransactor struct {
	contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// StoreFilterer is an auto generated log filtering Go binding around an Ethereum contract events.
type StoreFilterer struct {
	contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// StoreSession is an auto generated Go binding around an Ethereum contract,
// with pre-set call and transact options.
type StoreSession struct {
	Contract     *Store            // Generic contract binding to set the session for
	CallOpts     bind.CallOpts     // Call options to use throughout this session
	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}

// StoreCallerSession is an auto generated read-only Go binding around an Ethereum contract,
// with pre-set call options.
type StoreCallerSession struct {
	Contract *StoreCaller  // Generic contract caller binding to set the session for
	CallOpts bind.CallOpts // Call options to use throughout this session
}

// StoreTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
// with pre-set transact options.
type StoreTransactorSession struct {
	Contract     *StoreTransactor  // Generic contract transactor binding to set the session for
	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}

// StoreRaw is an auto generated low-level Go binding around an Ethereum contract.
type StoreRaw struct {
	Contract *Store // Generic contract binding to access the raw methods on
}

// StoreCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
type StoreCallerRaw struct {
	Contract *StoreCaller // Generic read-only contract binding to access the raw methods on
}

// StoreTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
type StoreTransactorRaw struct {
	Contract *StoreTransactor // Generic write-only contract binding to access the raw methods on
}

// NewStore creates a new instance of Store, bound to a specific deployed contract.
func NewStore(address common.Address, backend bind.ContractBackend) (*Store, error) {
	contract, err := bindStore(address, backend, backend, backend)
	if err != nil {
		return nil, err
	}
	return &Store{StoreCaller: StoreCaller{contract: contract}, StoreTransactor: StoreTransactor{contract: contract}, StoreFilterer: StoreFilterer{contract: contract}}, nil
}

// NewStoreCaller creates a new read-only instance of Store, bound to a specific deployed contract.
func NewStoreCaller(address common.Address, caller bind.ContractCaller) (*StoreCaller, error) {
	contract, err := bindStore(address, caller, nil, nil)
	if err != nil {
		return nil, err
	}
	return &StoreCaller{contract: contract}, nil
}

// NewStoreTransactor creates a new write-only instance of Store, bound to a specific deployed contract.
func NewStoreTransactor(address common.Address, transactor bind.ContractTransactor) (*StoreTransactor, error) {
	contract, err := bindStore(address, nil, transactor, nil)
	if err != nil {
		return nil, err
	}
	return &StoreTransactor{contract: contract}, nil
}

// NewStoreFilterer creates a new log filterer instance of Store, bound to a specific deployed contract.
func NewStoreFilterer(address common.Address, filterer bind.ContractFilterer) (*StoreFilterer, error) {
	contract, err := bindStore(address, nil, nil, filterer)
	if err != nil {
		return nil, err
	}
	return &StoreFilterer{contract: contract}, nil
}

// bindStore binds a generic wrapper to an already deployed contract.
func bindStore(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor, filterer bind.ContractFilterer) (*bind.BoundContract, error) {
	parsed, err := abi.JSON(strings.NewReader(StoreABI))
	if err != nil {
		return nil, err
	}
	return bind.NewBoundContract(address, parsed, caller, transactor, filterer), nil
}

// Call invokes the (constant) contract method with params as input values and
// sets the output to result. The result type might be a single field for simple
// returns, a slice of interfaces for anonymous returns and a struct for named
// returns.
func (_Store *StoreRaw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
	return _Store.Contract.StoreCaller.contract.Call(opts, result, method, params...)
}

// Transfer initiates a plain transaction to move funds to the contract, calling
// its default method if one is available.
func (_Store *StoreRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
	return _Store.Contract.StoreTransactor.contract.Transfer(opts)
}

// Transact invokes the (paid) contract method with params as input values.
func (_Store *StoreRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
	return _Store.Contract.StoreTransactor.contract.Transact(opts, method, params...)
}

// Call invokes the (constant) contract method with params as input values and
// sets the output to result. The result type might be a single field for simple
// returns, a slice of interfaces for anonymous returns and a struct for named
// returns.
func (_Store *StoreCallerRaw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
	return _Store.Contract.contract.Call(opts, result, method, params...)
}

// Transfer initiates a plain transaction to move funds to the contract, calling
// its default method if one is available.
func (_Store *StoreTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
	return _Store.Contract.contract.Transfer(opts)
}

// Transact invokes the (paid) contract method with params as input values.
func (_Store *StoreTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
	return _Store.Contract.contract.Transact(opts, method, params...)
}

// Retrieve is a free data retrieval call binding the contract method 0x2e64cec1.
//
// Solidity: function retrieve() view returns(uint256)
func (_Store *StoreCaller) Retrieve(opts *bind.CallOpts) (*big.Int, error) {
	var out []interface{}
	err := _Store.contract.Call(opts, &out, "retrieve")

	if err != nil {
		return *new(*big.Int), err
	}

	out0 := *abi.ConvertType(out[0], new(*big.Int)).(**big.Int)

	return out0, err

}

// Retrieve is a free data retrieval call binding the contract method 0x2e64cec1.
//
// Solidity: function retrieve() view returns(uint256)
func (_Store *StoreSession) Retrieve() (*big.Int, error) {
	return _Store.Contract.Retrieve(&_Store.CallOpts)
}

// Retrieve is a free data retrieval call binding the contract method 0x2e64cec1.
//
// Solidity: function retrieve() view returns(uint256)
func (_Store *StoreCallerSession) Retrieve() (*big.Int, error) {
	return _Store.Contract.Retrieve(&_Store.CallOpts)
}

// Store is a paid mutator transaction binding the contract method 0x6057361d.
//
// Solidity: function store(uint256 num) returns()
func (_Store *StoreTransactor) Store(opts *bind.TransactOpts, num *big.Int) (*types.Transaction, error) {
	return _Store.contract.Transact(opts, "store", num)
}

// Store is a paid mutator transaction binding the contract method 0x6057361d.
//
// Solidity: function store(uint256 num) returns()
func (_Store *StoreSession) Store(num *big.Int) (*types.Transaction, error) {
	return _Store.Contract.Store(&_Store.TransactOpts, num)
}

// Store is a paid mutator transaction binding the contract method 0x6057361d.
//
// Solidity: function store(uint256 num) returns()
func (_Store *StoreTransactorSession) Store(num *big.Int) (*types.Transaction, error) {
	return _Store.Contract.Store(&_Store.TransactOpts, num)
}

Store.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {
    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}