Pingo 是一个用来为 Go 程序编写插件的简单独立库,因为 Go 本身是静态链接的,因此所有插件都以外部进程方式存在。Pingo 旨在简化标准 RPC 包,支持 TCP 和 Unix 套接字作为通讯协议。当前还不支持远程插件,如果有需要,远程插件很快会提供。
使用 Pingo 创建一个插件非常简单,首先新建目录,如 "plugins/hello-world" ,然后在该目录下编写 main.go:
// Always create a new binary
package main
import "github.com/dullgiulio/pingo"
// Create an object to be exported
type MyPlugin struct{}
// Exported method, with a RPC signature
func (p *MyPlugin) SayHello(name string, msg *string) error {
*msg = "Hello, " + name
return nil
}
func main() {
plugin := &MyPlugin{}
// Register the objects to be exported
pingo.Register(plugin)
// Run the main events handler
pingo.Run()
}
编译:
$ cd plugins/hello-world
$ go build
接下来就可以调用该插件:
package main
import (
"log"
"github.com/dullgiulio/pingo"
)
func main() {
// Make a new plugin from the executable we created. Connect to it via TCP
p := pingo.NewPlugin("tcp", "plugins/hello-world/hello-world")
// Actually start the plugin
p.Start()
// Remember to stop the plugin when done using it
defer p.Stop()
var resp string
// Call a function from the object we created previously
if err := p.Call("MyPlugin.SayHello", "Go developer", &resp); err != nil {
log.Print(err)
} else {
log.Print(resp)
}
}
文章转载自 开源中国社区 [http://www.oschina.net]