A brief analysis of how to use evio in golang

Golang is an efficient and high-performance programming language, and evio is a high-performance event loop library developed based on Golang. It supports asynchronous and concurrency, can quickly handle network IO, and is one of the first choices for high-performance server development. This article will introduce the usage of evio to help readers better understand and master this library.

1. Characteristics of evio

The characteristic of evio is that it uses an asynchronous, non-blocking event loop, which has the following advantages:

1. High performance: evio uses inline The epoll/kqueue implements event management and can efficiently handle a large number of concurrent connections.

2. Simple and easy to use: evio is very easy to understand and use. It only takes a few lines of code to complete a very efficient network IO program.

3. Strong scalability: evio supports custom event processors, which can expand and customize the processing logic of various event types.

2. Installation of evio

Installing evio is very simple, just enter the following command in the terminal:

go get github.com/tidwall/evio

3. Using evio

The following will demonstrate how to use evio to write a simple server program.

First, we need to import evio:

import (

"github.com/tidwall/evio"

)

Then, define an evio event handler:

func handler(conn evio.Conn, in []byte) (out []byte, action evio.Action) {

// 处理网络连接事件

}

event handler is called by evio to handle network events Callback function, which receives a parameter of type evio.Conn, representing the connection object; a parameter of type []byte, representing the received data. This function needs to return two values, a []byte type value, which represents the data that needs to be sent; and an evio.Action type value, which represents the operation that needs to be performed.

We can use the switch statement in the processing method to implement the processing logic of different types of events:

func handler(conn evio.Conn, in []byte) (out []byte, action evio.Action) {

// 接收到数据
switch string(in) {
case "ping":
    return []byte("pong"), evio.None

case "pong":
    return nil, evio.Close

default:
    return []byte("unknown command"), evio.None
}

}

Now that we have prepared the event handler, we can start writing the server-side code:

func main() {

// 监听的地址
addr := "0.0.0.0:8000"

// 运行事件循环
if err := evio.Serve(evio.Params{
    // 监听地址
    Addr: addr,

    // 事件处理器
    Handler: handler,

    // 日志信息
    Log: func(msg string, err error) {
        if err != nil {
            log.Printf("%s: %v", msg, err)
        } else {
            log.Println(msg)
        }
    },
}); err != nil {
    panic(err)
}

}

In the above code, we started a Server and specified the listening address addr and event processor handler. In addition, we also specified a log information callback function to record error log information within evio.

4. Summary

evio is an efficient and high-performance event loop library. It can handle a large number of concurrent connections and is very suitable for high-performance network development. When using evio, we only need to define an event handler to complete most network IO operations, and the code is very concise and easy to understand. If you are looking for an efficient web framework, give evio a try.

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