一个golang项目笔记 (二) 动态加载库

package main
import (
	"os"
	"github.com/hashicorp/go-hclog"
	"github.com/hashicorp/go-plugin"
	"github.com/hashicorp/go-plugin/examples/basic/commons"
)
// Here is a real implementation of Greeter
type GreeterHello struct {
	logger hclog.Logger
}
func (g *GreeterHello) Greet() string {
	g.logger.Debug("message from GreeterHello.Greet")
	return "Hello!"
}
// 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",
}
func main() {
	logger := hclog.New(&hclog.LoggerOptions{
		Level: hclog.Trace,
		Output: os.Stderr,
		JSONFormat: true,
	})
	greeter := &GreeterHello{
		logger: logger,
	}
	// pluginMap is the map of plugins we can dispense.
	var pluginMap = map[string]plugin.Plugin{
		"greeter": &example.GreeterPlugin{Impl: greeter},
	}
	logger.Debug("message from plugin", "foo", "bar")
	plugin.Serve(&plugin.ServeConfig{
		HandshakeConfig: handshakeConfig,
		Plugins: pluginMap,
	})
}

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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