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|
package hook
import (
"fmt"
"log"
"reflect"
"sort"
"strings"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
var hooks = map[string]interface{}{}
type Pipe struct {
priv interface{}
Hook H
Send Func
Recv Func
}
type Hooker interface {
New(env env.Env) (interface{}, error)
}
type H interface {
New(env env.Env) (*Pipe, error)
}
type Sender interface {
Send(rq, wq queue.Q) error
}
type Recver interface {
Recv(rq, wq queue.Q) error
}
type Func func(rq, wq queue.Q) error
func (f Func) Send(rq, wq queue.Q) error {
return f(rq, wq)
}
func (f Func) New(env env.Env) (interface{}, error) {
return f, nil
}
type wrapper struct {
hook Hooker
name string
reverse bool
}
func (w *wrapper) String() string {
return fmt.Sprintf("hook:%s", w.name)
}
func (w *wrapper) New(env env.Env) (*Pipe, error) {
it, err := w.hook.New(env)
if err != nil {
return nil, err
}
pipe := &Pipe{priv: it, Hook: w}
if s, ok := it.(Sender); ok {
pipe.Send = s.Send
}
if r, ok := it.(Recver); ok {
pipe.Recv = r.Recv
}
if w.reverse {
pipe.Send, pipe.Recv = pipe.Recv, pipe.Send
}
return pipe, nil
}
func (p *Pipe) Close() {
if c, ok := p.priv.(interface{ Close() }); ok {
c.Close()
}
}
func initHook(i interface{}, opts opts.Opts) (Hooker, error) {
if f, ok := i.(Func); ok {
return f, nil
}
if p, ok := i.(pipeHolder); ok {
return p, nil
}
h := reflect.New(reflect.TypeOf(i)).Interface()
if err := opts.Configure(h); err != nil {
return nil, err
}
return h.(Hooker), nil
}
func New(desc string) (H, error) {
name, opts := opts.Parse(desc)
reverse := false
if strings.HasPrefix(name, "-") {
name = name[1:]
reverse = true
}
if i, ok := hooks[name]; !ok {
return nil, fmt.Errorf("unknown hook '%s'", name)
} else if h, err := initHook(i, opts); err != nil {
return nil, fmt.Errorf("%s: %w", name, err)
} else {
w := &wrapper{
hook: h,
name: name,
reverse: reverse,
}
return w, nil
}
}
func register(name string, i interface{}) {
switch t := reflect.TypeOf(i); t.Kind() {
case reflect.Struct:
if _, ok := reflect.New(t).Interface().(Hooker); !ok {
log.Panicf("uncompatible hook type '%s'", t.String())
}
case reflect.Func:
if _, ok := i.(Func); !ok {
log.Panicf("uncompatible func type '%s'", t.String())
}
default:
log.Panicf("non-struct and non-func type '%s'", t.String())
}
if _, ok := hooks[name]; ok {
log.Panicf("duplicate hook name '%s'", name)
}
hooks[name] = i
}
func registerFunc(name string, f Func) {
register(name, f)
}
type pipeHolder struct {
i interface{}
}
func (p pipeHolder) New(env.Env) (interface{}, error) {
return p.i, nil
}
func registerPipe(name string, i interface{}) {
register(name, pipeHolder{i})
}
func GetList() []string {
var list []string
for k := range hooks {
list = append(list, k)
}
sort.Strings(list)
return list
}
|
