How to use Go language for blockchain browser development?

With the continuous development of blockchain technology, more and more people are paying attention to the development of blockchain browsers. Blockchain browser is a tool for browsing blockchain data, which can help users query blockchain transaction records, blockchain address information, etc. Currently, there are many open source blockchain browsers on the market, such as Bitcoin’s official browser Blochain.info; Ethereum’s Etherscan, etc. Most of them are developed using languages ​​such as JavaScript, and the Go language has gradually become a popular development language for blockchain browsers.

This article focuses on how to use the Go language to develop a blockchain browser. It mainly includes the following content:

1. Basic principles of blockchain browser
2. Steps to develop blockchain browser in Go language
3. A simple blockchain Browser example

Basic principles of blockchain browser

Blockchain browser realizes browsing by parsing and visually displaying blockchain data. The basic principle is to obtain blockchain data through blockchain nodes (such as Bitcoin nodes or Ethereum nodes) and parse it into a form that is easy to understand and present. Therefore, the blockchain browser usually needs to implement the following functions:

(1) Obtain blockchain data: The blockchain browser needs to connect to the blockchain node and obtain the blockchain through RPC interfaces, etc. data.

(2) Parse blockchain data: Blockchain data is usually saved in binary format and needs to be parsed into an easy-to-process data structure.

(3) Display blockchain data: Display the parsed data in a visual way, including transaction records, block height, address balance and other information.

Steps to develop a blockchain browser using Go language

Below, we summarize the steps to develop a blockchain browser using Go language:

Step 1: Connection To the blockchain node

In the Go language, you can use the rpc package to connect to the blockchain node and obtain the blockchain data by calling the corresponding rpc method. For example, Bitcoin nodes provide a JSON-RPC interface for obtaining data, which can be connected using the btcd/rpcclient package. The usage method is as follows:

import (
"github.com/btcsuite/btcd/rpcclient"
"log"
)

func main() {

// 创建 RPC 配置
rpcConfig := &rpcclient.ConnConfig{
Host:         "127.0.0.1:8332",
User:         "username",
Pass:         "passowrd",
HTTPPostMode: true,
}

// 连接到节点
client, err := rpcclient.New(rpcConfig, nil)
if err != nil {
log.Fatal(err)
}

// 调用 RPC 方法
// ...
}

Step 2: Parse the blockchain data

After obtaining the blockchain data, it needs to be parsed into a form that is easy to understand and present. The Go language provides libraries such as json and gob, which can be used to parse JSON or binary data. For example, the code for parsing Bitcoin transactions is as follows:

type btcTransaction struct {
Txid string `json:"txid"`
Version int `json:"version"`
LockTime int `json:"locktime"`
Size int `json:"size"`
Vin []struct {
Txid string `json:"txid"`
Vout int `json:"vout"`
ScriptSig struct {
        Asm string `json:"asm"`
        Hex string `json:"hex"`
} `json:"scriptSig"`
Sequence int `json:"sequence"`
} `json:"vin"`
Vout []struct {
Value float64 `json:"value"`
N int `json:"n"`
ScriptPubKey struct {
        Asm string `json:"asm"`
        Hex string `json:"hex"`
        ReqSigs int `json:"reqSigs"`
        Type string `json:"type"`
        Addresses []string `json:"addresses"`
} `json:"scriptPubKey"`
} `json:"vout"`
}

func getTransaction(client *rpcclient.Client, txid string) (*btcTransaction, error) {
transactionJSON, err := client.GetRawTransactionVerbose(txid)
if err != nil {
return nil, err
}
var transaction btcTransaction
err = json.Unmarshal([]byte(transactionJSON), &transaction)
if err != nil {
return nil, err
}
return &transaction, nil
}

Step 3: Display blockchain data

After obtaining the parsed data, it can be displayed through Web pages and other methods. In Go language, you can use web frameworks such as gin or beego to build web applications. For example, the code that uses the gin framework to display blockchain transaction records is as follows:

import (
"github.com/gin-gonic/gin"
"net/http"
)

func main() {
router := gin.Default()

router.GET("/transaction/:txid", getTransactionHandler)

router.Run(":8080")
}

func getTransactionHandler(c *gin.Context) {
txid := c.Param("txid")
transaction, err := getTransaction(client, txid)
if err != nil {
c.AbortWithError(http.StatusInternalServerError, err)
return
}
c.JSON(http.StatusOK, gin.H{
"txid": transaction.Txid,
"value": transaction.Vout[0].Value,
"addresses": transaction.Vout[0].ScriptPubKey.Addresses,
})
}

A simple blockchain browser example

In order to better understand the development process of the blockchain browser , we can try to use Go language to develop a simple blockchain browser.

Our goal is to display the transaction records, balance and other information of the Bitcoin address through the Web page. The specific implementation steps are as follows:

Step 1: Connect to the Bitcoin node

You can use the btcd/rpcclient package to connect to the Bitcoin node and obtain blockchain data.

rpcConfig := &rpcclient.ConnConfig{
Host:         "127.0.0.1:8332",
User:         "username",
Pass:         "password",
HTTPPostMode: true,
DisableTLS:   true,
}
client, err := rpcclient.New(rpcConfig, nil)
if err != nil {
log.Fatal(err)
}

Step 2: Analyze the transaction record and balance of the Bitcoin address

After obtaining the transaction record and balance of the Bitcoin address, it can be displayed through the Web page.

// 获取比特币地址的交易记录
addressTxs, err := client.ListTransactionsCountAddr(address, 100)
if err != nil {
log.Fatal(err)
}
// 获取比特币地址的余额
addressBalance, err := client.GetAddressBalance(address)
if err != nil {
log.Fatal(err)
}

Step 3: Use the gin framework to display blockchain data

Use the gin framework to build a web application and display the transaction records and balances of Bitcoin addresses on the web page.

r := gin.Default()
r.GET("/address/:address", func(c *gin.Context) {
address := c.Param("address")
// 获取比特币地址的交易记录
addressTxs, err := client.ListTransactionsCountAddr(address, 100)
if err != nil {
c.AbortWithError(http.StatusInternalServerError, err)
return
}
// 获取比特币地址的余额
addressBalance, err := client.GetAddressBalance(address)
if err != nil {
c.AbortWithError(http.StatusInternalServerError, err)
return
}
c.HTML(http.StatusOK, "address.tmpl", gin.H{
"address":       address,
"transactions":  addressTxs,
"balance":       addressBalance,
})
})

The above is the basic sample code for developing a simple blockchain browser using Go language. The complete code can be found at https://github.com/xxx/xxx.

Conclusion

Go language has many advantages in the development of blockchain browsers, such as efficiency, simplicity, ease of use, etc. This article introduces the basic steps of using Go language for blockchain browser development, including connecting to blockchain nodes, parsing blockchain data, displaying blockchain data, etc. Readers can try more experiments and practices based on the sample code in this article. I hope it will be helpful to everyone.

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