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package main
import (
"fmt"
"log"
"os"
"os/exec"
hclog "github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-plugin"
"github.com/hashicorp/go-plugin/examples/basic/commons"
)
func main() {
// Create an hclog.Logger
logger := hclog.New(&hclog.LoggerOptions{
Name: "plugin",
Output: os.Stdout,
Level: hclog.Debug,
})
// We're a host! Start by launching the plugin process.
client := plugin.NewClient(&plugin.ClientConfig{
HandshakeConfig: handshakeConfig,
Plugins: pluginMap,
Cmd: exec.Command("./plugin/greeter"),
Logger: logger,
})
defer client.Kill()
// Connect via RPC
rpcClient, err := client.Client()
if err != nil {
log.Fatal(err)
}
// Request the plugin
raw, err := rpcClient.Dispense("greeter")
if err != nil {
log.Fatal(err)
}
// We should have a Greeter now! This feels like a normal interface
// implementation but is in fact over an RPC connection.
greeter := raw.(example.Greeter)
fmt.Println(greeter.Greet())
}
// handshakeConfigs are used to just do a basic handshake between
// a plugin and host. If the handshake fails, a user friendly error is shown.
// This prevents users from executing bad plugins or executing a plugin
// directory. It is a UX feature, not a security feature.
var handshakeConfig = plugin.HandshakeConfig{
ProtocolVersion: 1,
MagicCookieKey: "BASIC_PLUGIN",
MagicCookieValue: "hello",
}
// pluginMap is the map of plugins we can dispense.
var pluginMap = map[string]plugin.Plugin{
"greeter": &example.GreeterPlugin{},
}
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