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package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"strconv"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/go-plugin/examples/bidirectional/shared"
)
type addHelper struct{}
func (*addHelper) Sum(a, b int64) (int64, error) {
return a + b, nil
}
func main() {
// We don't want to see the plugin logs.
log.SetOutput(ioutil.Discard)
// We're a host. Start by launching the plugin process.
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: shared.Handshake,
Plugins: shared.PluginMap,
Cmd: exec.Command("sh", "-c", os.Getenv("COUNTER_PLUGIN")),
AllowedProtocols: []plugin.Protocol{
plugin.ProtocolNetRPC, plugin.ProtocolGRPC},
})
defer client.Kill()
// Connect via RPC
rpcClient, err := client.Client()
if err != nil {
fmt.Println("Error:", err.Error())
os.Exit(1)
}
// Request the plugin
raw, err := rpcClient.Dispense("counter")
if err != nil {
fmt.Println("Error:", err.Error())
os.Exit(1)
}
// We should have a Counter store now! This feels like a normal interface
// implementation but is in fact over an RPC connection.
counter := raw.(shared.Counter)
os.Args = os.Args[1:]
switch os.Args[0] {
case "get":
result, err := counter.Get(os.Args[1])
if err != nil {
fmt.Println("Error:", err.Error())
os.Exit(1)
}
fmt.Println(result)
case "put":
i, err := strconv.Atoi(os.Args[2])
if err != nil {
fmt.Println("Error:", err.Error())
os.Exit(1)
}
err = counter.Put(os.Args[1], int64(i), &addHelper{})
if err != nil {
fmt.Println("Error:", err.Error())
os.Exit(1)
}
default:
fmt.Println("Please only use 'get' or 'put'")
os.Exit(1)
}
}
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