Simple plugin example for Go 1.8+.

addon-slash-addon.go

// addon/addon.go
// The definition of a plugin. Each plugin project would include this stub.
package addon

type Addon interface {
	Hello()
}

hello-slash-hello.go

// hello/hello.go
// Example plugin implementation.
//go:generate go build -buildmode=plugin -ldflags "-w -s"
package main

import "C"

import "fmt"
import "../addon"

type AddonImpl struct{}

var Impl addon.Addon = AddonImpl{}

func (p AddonImpl) Hello() {
	fmt.Println("Hello!")
}

main.go

// The test program which loads the "hello" plugin.
package main

import (
	"plugin"

	addon "./addon"
)

func main() {
	p := getPlugin("hello/hello.so")
	p.Hello()
}

func getPlugin(name string) addon.Addon {
	p, err := plugin.Open(name)
	check(err)
	imp, err := p.Lookup("Impl")
	check(err)
	return *imp.(*addon.Addon)
}