126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
// Package plugin provides the ability to load plugins
|
|
package plugin
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"os"
|
|
"os/exec"
|
|
"path/filepath"
|
|
pg "plugin"
|
|
"strings"
|
|
"text/template"
|
|
|
|
"github.com/micro/go-micro/broker"
|
|
"github.com/micro/go-micro/client"
|
|
"github.com/micro/go-micro/client/selector"
|
|
"github.com/micro/go-micro/config/cmd"
|
|
"github.com/micro/go-micro/registry"
|
|
"github.com/micro/go-micro/server"
|
|
"github.com/micro/go-micro/transport"
|
|
)
|
|
|
|
type plugin struct{}
|
|
|
|
// Init sets up the plugin
|
|
func (p *plugin) Init(c *Config) error {
|
|
switch c.Type {
|
|
case "broker":
|
|
pg, ok := c.NewFunc.(func(...broker.Option) broker.Broker)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultBrokers[c.Name] = pg
|
|
case "client":
|
|
pg, ok := c.NewFunc.(func(...client.Option) client.Client)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultClients[c.Name] = pg
|
|
case "registry":
|
|
pg, ok := c.NewFunc.(func(...registry.Option) registry.Registry)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultRegistries[c.Name] = pg
|
|
|
|
case "selector":
|
|
pg, ok := c.NewFunc.(func(...selector.Option) selector.Selector)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultSelectors[c.Name] = pg
|
|
case "server":
|
|
pg, ok := c.NewFunc.(func(...server.Option) server.Server)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultServers[c.Name] = pg
|
|
case "transport":
|
|
pg, ok := c.NewFunc.(func(...transport.Option) transport.Transport)
|
|
if !ok {
|
|
return fmt.Errorf("Invalid plugin %s", c.Name)
|
|
}
|
|
cmd.DefaultTransports[c.Name] = pg
|
|
default:
|
|
return fmt.Errorf("Unknown plugin type: %s for %s", c.Type, c.Name)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Load loads a plugin created with `go build -buildmode=plugin`
|
|
func (p *plugin) Load(path string) (*Config, error) {
|
|
plugin, err := pg.Open(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s, err := plugin.Lookup("Plugin")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pl, ok := s.(*Config)
|
|
if !ok {
|
|
return nil, errors.New("could not cast Plugin object")
|
|
}
|
|
return pl, nil
|
|
}
|
|
|
|
// Generate creates a go file at the specified path.
|
|
// You must use `go build -buildmode=plugin`to build it.
|
|
func (p *plugin) Generate(path string, c *Config) error {
|
|
f, err := os.Create(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
t, err := template.New(c.Name).Parse(tmpl)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return t.Execute(f, c)
|
|
}
|
|
|
|
// Build generates a dso plugin using the go command `go build -buildmode=plugin`
|
|
func (p *plugin) Build(path string, c *Config) error {
|
|
path = strings.TrimSuffix(path, ".so")
|
|
|
|
// create go file in tmp path
|
|
temp := os.TempDir()
|
|
base := filepath.Base(path)
|
|
goFile := filepath.Join(temp, base+".go")
|
|
|
|
// generate .go file
|
|
if err := p.Generate(goFile, c); err != nil {
|
|
return err
|
|
}
|
|
// remove .go file
|
|
defer os.Remove(goFile)
|
|
|
|
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil && !os.IsExist(err) {
|
|
return fmt.Errorf("Failed to create dir %s: %v", filepath.Dir(path), err)
|
|
}
|
|
cmd := exec.Command("go", "build", "-buildmode=plugin", "-o", path+".so", goFile)
|
|
return cmd.Run()
|
|
}
|