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package widget
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"now/widget/api"
"os"
"os/exec"
"strings"
"time"
)
const Version uint = 1
var (
ErrUnexceptedType = errors.New("unexcepted type")
)
type Widget struct {
api.Hello
Path string `json:"-"`
}
func FromJson(data []byte) (*Widget, error) {
var widget Widget
return &widget, json.Unmarshal(data, &widget)
}
func Load(path string) ([]*Widget, error) {
path = strings.TrimSuffix(path, "/")
dir, err := os.ReadDir(path)
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
return nil, err
}
return nil, os.Mkdir(path, 0755)
}
return readPluginDir(dir, path+"/")
}
func readPluginDir(dir []os.DirEntry, path string) ([]*Widget, error) {
if !strings.HasSuffix(path, "/") {
path += "/"
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var widgets []*Widget
for _, e := range dir {
p := path + e.Name()
if e.IsDir() {
d, err := os.ReadDir(p)
if err != nil {
return nil, err
}
ws, err := readPluginDir(d, p)
if err != nil {
return nil, err
}
widgets = append(widgets, ws...)
}
w := &Widget{
Path: p,
}
c := make(chan any)
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
go w.Request(ctx, api.MethodHello, c)
select {
case <-ctx.Done():
cancel()
return nil, ctx.Err()
case out := <-c:
cancel()
err, ok := out.(error)
if ok {
return nil, err
}
b, ok := out.([]byte)
if !ok {
return nil, errors.Join(ErrUnexceptedType, fmt.Errorf("got %T instead of []byte", out))
}
if err = json.Unmarshal(b, w); err != nil {
return nil, err
}
}
widgets = append(widgets, w)
}
return widgets, nil
}
func (w *Widget) Request(_ context.Context, m api.Method, c chan<- any, args ...string) {
args = append([]string{string(m)}, args...)
cmd := exec.Command(fmt.Sprintf("./plugins/%s", w.Path), args...)
if cmd.Err != nil {
c <- cmd.Err
return
}
wb := new(bytes.Buffer)
cmd.Stdout = wb
cmd.Stderr = wb
if err := cmd.Run(); err != nil {
c <- err
return
}
b, err := io.ReadAll(wb)
if err != nil {
c <- err
return
}
c <- b
}
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