Extension plug-in development based on golang framework

Extension plug-ins are tools that enhance the functionality of the GoLang framework. You can create and register plug-ins to add new functionality and behavior to your application. Plug-ins are created by implementing the MyPlugin interface, and are registered using the plugin.Register function. Practical examples include creating a custom log plug-in to handle logging requests.

Extension plug-in development based on GoLang framework

Introduction

The extension plug-in is Powerful tool to extend the functionality of an existing framework or application. In GoLang, you can use the plugin system to create and register plugins to add new functionality and behavior to your application.

Create a plug-in

To create a plug-in, create a new file named plugin_<plugin name>.go</plugin>, where <plug-in name></plug-in> is the name of the plug-in.

// plugin_example.go
package main

import "fmt"

// 实现 MyPlugin 接口以创建插件
type MyPlugin struct{
}

// 接口函数，将在导入插件时调用
func (p *MyPlugin) Run() { fmt.Println("Hello from the plugin!") }

Register Plugin

To register a plugin in your application, use the plugin.Register function.

package main

import (
    "fmt"
    "plugin"
)

func main() {
    p, err := plugin.Open("./plugin_example.so")
    if err != nil { panic(err) }

    // 加载并类型断言插件符号
    sym, err := p.Lookup("MyPlugin")
    if err != nil { panic(err) }

    // 调用 Run 方法
    plugin := sym.(func())()
}

Practical case: Adding custom logging

Suppose we want to extend the application to support custom logging. We can create a plugin to handle logging requests.

// log_plugin.go
package main

import (
    "fmt"
    "io"
    "plugin"
)

type Logger interface{
    Log(msg string)
}

type MyLogger struct { w io.Writer }

func (l *MyLogger) Log(msg string) { fmt.Fprintln(l.w, msg) }

func main() {
    p, err := plugin.Open("./log_plugin.so")
    if err != nil { panic(err) }

    sym, err := p.Lookup("MyLogger")
    if err != nil { panic(err) }

    logger := sym.(func(io.Writer) Logger)(os.Stdout)
    logger.Log("Hello from the custom logger!")
}

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