How to define a plugin interface for dynamic loading in Golang?

To define a plugin interface for dynamic loading in Go, follow these steps:

Create a Go package to define the plugin interface. This package will contain the interface declaration and any other shared types or constants necessary for the plugins.

package myplugin

type Plugin interface {
    Run() error
}

Build the plugin as a Go shared library. You can do this by creating a separate Go package for the plugin implementation and using the -buildmode=plugin flag during the build process. Note that you must use a separate package because the plugin needs to be built as a main package.

go build -buildmode=plugin -o plugin.so plugin.go

The plugin implementation should implement the Plugin interface.

package main

import "myplugin"

type MyPlugin struct{}

func (p *MyPlugin) Run() error {
    // Implement the plugin logic
    return nil
}

var Plugin MyPlugin

Load the plugin dynamically in your main program using the plugin package. You can then interact with the plugin through the defined interface.

package main

import (
    "myplugin"
    "plugin"
)

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

    symbol, err := p.Lookup("Plugin")
    if err != nil {
        // Handle error
    }

    myPlugin, ok := symbol.(*myplugin.Plugin)
    if !ok {
        // Handle type assertion error
    }

    err = myPlugin.Run()
    if err != nil {
        // Handle error
    }
}

Build and run your main program. It will dynamically load the plugin at runtime and execute the desired functionality.

Note: Dynamically loaded plugins must be built for the target platform/architecture you are running on.