How does golang implement TRX-based transfer function?

In a decentralized world, digital currency and blockchain technology will gradually replace the traditional financial system and become the main way for people to conduct daily transactions. Digital currency transactions not only rely on users who own digital assets, but also rely on various digital currency trading platforms. Among them, TRX is a digital currency based on Ethereum smart contract technology and is known to more and more people. In the process of trading TRX, transfer operations are the most common and important, and the Golang language provides an efficient and easy-to-maintain programming method that can help us complete the TRX-based transfer function.

1. Building a basic environment

Before we start writing the TRX transfer code, we need to build a corresponding development environment. First, you need to install the Golang development environment. The download address is: https://golang.org/dl/. After the installation is completed, we need to download the ethereum development library from Github and complete the installation by command "go get -u github.com/ethereum/go-ethereum".

2. TRX transfer function

The realization of TRX transfer function requires the help of Ethereum’s smart contract technology. We can operate Ethereum through Golang language. Here are two options.

Option 1: Implemented by calling web3 Javascript API

web3 Javascript API provides a set of convenient and easy-to-use APIs that can perform various Ethereum operations, including creating wallets, transferring, deploying and Call smart contracts, etc.

First we need to introduce the web3 Javascript API into the Golang project. The introduction can be completed by command "go get github.com/ethereum/go-ethereum/console".

Next we need to use the web3 Javascript API to complete the TRX transfer function. The specific code is as follows:

package main

import (
    "context"
    "fmt"
    "github.com/ethereum/go-ethereum/console"
    "github.com/ethereum/go-ethereum/ethclient"
    "github.com/ethereum/go-ethereum/rpc"
)

// 转账
func transfer(from, to, amount, contractAddress string) (string, error) {
    eth, err := rpc.Dial("http://localhost:8545")
    if err != nil {
        return "", err
    }

    client := ethclient.NewClient(eth)

    txOpts := ethclient.NewTransactOpts()

    balance, err := client.BalanceAt(context.Background(), common.HexToAddress(from), nil)
    if err != nil {
        return "", err
    }

    gasPrice, err := client.SuggestGasPrice(context.Background())
    if err != nil {
        return "", err
    }
    nonce, err := client.PendingNonceAt(context.Background(), common.HexToAddress(from))
    if err != nil {
        return "", err
    }

    tx := types.NewTransaction(nonce, common.HexToAddress(to), amount, gasPrice, nil, nil)

    chainID, err := client.NetworkID(context.Background())
    if err != nil {
        return "", err
    }
    signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), common.HexToAddress(from), txOpts)
    if err != nil {
        return "", err
    }

    err = client.SendTransaction(context.Background(), signedTx)
    if err != nil {
        return "", err
    }

    return signedTx.Hash().Hex(), nil
}

Among them, from and to represent the addresses of the transfer account and the transfer account, amount represents the transfer amount, and contractAddress represents the contract address. What needs to be noted here is that when the transfer operation involves a smart contract, the contract address needs to be specified through the contractAddress parameter.

Option 2: Implement it by writing smart contracts

We can use Solidity language to write smart contracts and realize the TRX transfer function through Ethereum’s smart contract technology. First we need to create a TRX contract. The specific code is as follows:

contract TRXContract {
    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);   
        balanceOf[msg.sender] -= _value;           
        balanceOf[_to] += _value;                  
        Transfer(msg.sender, _to, _value);          
        return true;
    }
}

This TRX contract contains a transfer function to complete the TRX transfer function. Among them, _to and _value correspond to the target address and amount of the transfer respectively.

In order to use this TRX contract, we need to deploy it to the Ethereum network. The specific code is as follows:

package main

import (
    "context"
    "crypto/ecdsa"
    "fmt"

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

func deployContract() (common.Address, *types.Transaction, *TRXContract, error) {
    privateKey, err := crypto.HexToECDSA("0cb6ac9c1acb0d935daa49ba3aed7dd779a520f98d7b29b44991bb89c30a4a96")
    if err != nil {
        return common.Address{}, nil, nil, err
    }

    publicKey := privateKey.Public()

    publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
    if !ok {
        return common.Address{}, nil, nil,  err
    }

    fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)

    client, err := ethclient.Dial("http://localhost:8545")
    if err != nil {
        return common.Address{}, nil, nil, err
    }

    auth := bind.NewKeyedTransactor(privateKey)

    address, tx, instance, err := TRXContract.DeployTRXContract(auth, client)
    if err != nil {
        return common.Address{}, nil, nil, err
    }

    return address, tx, instance, nil
}

Next, we can use the deployed contract to implement the TRX transfer function. The specific code is as follows:

func (trx *TRXContract) transfer(to common.Address, amount *big.Int) (*types.Transaction, error) {
    auth, err := bind.NewTransactor(strings.NewReader(privateKey), "password")
    if err != nil {
        return nil, err
    }

    tx, err := trx.Transfer(auth, to, amount)
    if err != nil {
        return nil, err
    }

    return tx, nil
}

Note that we need to pass in the transfer account and transfer amount as parameters of the contract call, and the transfer account is specified when deploying the contract.

3. Summary

This article introduces the application of Golang language in TRX transfer function in detail, and introduces two solutions to complete TRX transfer through web3 Javascript API and by writing smart contracts. In practical applications, we can choose a method that is more suitable for us to implement the TRX transfer function, helping users complete digital currency transactions more conveniently and efficiently.

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