Some technologies about Golang plug-in solution

With the development of Golang, more and more people are beginning to use this language to build various applications. In the process of building applications, it is often necessary to use some plug-ins to implement specific functions. This article will introduce some technologies about Golang plug-in solutions.

1. What is a Golang plug-in?

Golang plug-in is a kind of code that can be loaded dynamically when the program is running. Typically, a Golang plug-in is a dynamic link library that can be compiled into a format such as .so or .dll, and can be loaded dynamically at runtime.

2. Benefits of using Golang plug-ins

Golang plug-ins allow us to split the application into independent modules. These modules can be written by different developers and can be used without stopping the application. Add or delete dynamically while the program is running.

In addition, the benefits of using Golang plug-ins also include:

1. Reduce the memory consumption of the application
2. Speed ​​up the startup time of the application
3. Yes Realizing hot updates

3. Golang plug-in solution technology

The following will introduce some commonly used Golang plug-in solution technologies:

1. Go Plugins

Go Plugins is the plug-in solution officially supported by Golang. By using Go Plugins, developers can split an application into multiple modules that can be loaded dynamically at runtime.

The implementation principle of Go Plugins is to use Go’s plug package. Developers can compile plugins using the go build -buildmode=plugin command. Within an application, plugins can be loaded dynamically using the plugin.Open() function. Once the plug-in is loaded, you can use the functions or variables provided by the plug-in.

Here is an example of loading a plugin using Go Plugins:

package main

import (
    "plugin"
)

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

    // 获取插件中的函数，并调用
    f, err := p.Lookup("Add")
    if err != nil {
        panic(err)
    }
    result := f.(func(int, int) int)(1, 2)
    println(result)
}

2. HashiCorp/go-plugin

HashiCorp/go-plugin is a popular Golang plug-in framework, which helps developers quickly build plug-in applications. HashiCorp/go-plugin is based on Go Plugins, but it further encapsulates Go Plugins, making it more convenient for developers to use Golang plug-ins.

HashiCorp/go-plugin uses Go Plugins to create and run plug-ins, and provides a set of RPC frameworks so that plug-ins can communicate with the main program.

The following is an example of using HashiCorp/go-plugin to load a plug-in:

package main

import (
    "fmt"
    "net/rpc"
    "os"
    "path/filepath"

    "github.com/hashicorp/go-plugin"
)

type MyPlugin struct{}

func (p *MyPlugin) Add(a, b int) int {
    return a + b
}

func main() {
    // 定义插件配置
    var pluginConfig = plugin.ClientConfig{
        HandshakeConfig: plugin.HandshakeConfig{
            ProtocolVersion:  1,
            MagicCookieKey:   "PLUGIN_MAGIC_COOKIE",
            MagicCookieValue: "decafbad",
        },

        // 插件运行的路径
        Cmd:            exec.Command(filepath.Join(".", "plugin")),
        AllowedProtocols: []plugin.Protocol{plugin.ProtocolNetRPC},
    }

    // 创建插件客户端
    client := plugin.NewClient(&pluginConfig)

    // 获取 RPC 客户端
    rpcClient, err := client.Client()
    if err != nil {
        panic(err)
    }

    // 获取插件中的函数，并调用
    var result int
    err = rpcClient.Call("MyPlugin.Add", &Args{1, 2}, &result)
    if err != nil {
        panic(err)
    }
    fmt.Println(result)
}

4. Notes on Golang plug-ins

In the process of using Golang plug-ins, you also need to Pay attention to some issues:

1. The plug-in and the main program need to be compiled with the same Go version
2. The use of Cgo in the plug-in should be avoided

Conclusion

This article introduces the concept of Golang plug-ins and the technology of common plug-in solutions. I hope this article can provide some help to readers in using plug-ins in Golang application development.

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