micro/plugin/default.go

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2019-09-10 05:09:28 +03:00
// Package plugin provides the ability to load plugins
package plugin
import (
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
pg "plugin"
"strings"
"text/template"
)
type plugin struct{}
// 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)
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cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
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return cmd.Run()
}