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132 lines
2.6 KiB
132 lines
2.6 KiB
package app
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import (
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"context"
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"reflect"
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"v2ray.com/core/common"
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"v2ray.com/core/common/errors"
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)
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type Application interface {
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Interface() interface{}
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Start() error
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Close()
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}
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type InitializationCallback func() error
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func CreateAppFromConfig(ctx context.Context, config interface{}) (Application, error) {
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application, err := common.CreateObject(ctx, config)
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if err != nil {
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return nil, err
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}
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switch a := application.(type) {
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case Application:
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return a, nil
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default:
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return nil, errors.New("App: Not an application.")
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}
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}
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// A Space contains all apps that may be available in a V2Ray runtime.
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// Caller must check the availability of an app by calling HasXXX before getting its instance.
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type Space interface {
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GetApplication(appInterface interface{}) Application
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AddApplication(application Application) error
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Initialize() error
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OnInitialize(InitializationCallback)
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Start() error
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Close()
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}
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type spaceImpl struct {
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initialized bool
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cache map[reflect.Type]Application
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appInit []InitializationCallback
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}
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func NewSpace() Space {
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return &spaceImpl{
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cache: make(map[reflect.Type]Application),
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appInit: make([]InitializationCallback, 0, 32),
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}
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}
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func (v *spaceImpl) OnInitialize(f InitializationCallback) {
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if v.initialized {
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f()
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} else {
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v.appInit = append(v.appInit, f)
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}
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}
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func (v *spaceImpl) Initialize() error {
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for _, f := range v.appInit {
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if err := f(); err != nil {
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return err
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}
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}
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v.appInit = nil
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v.initialized = true
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return nil
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}
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func (v *spaceImpl) GetApplication(appInterface interface{}) Application {
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if v == nil {
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return nil
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}
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appType := reflect.TypeOf(appInterface)
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return v.cache[appType]
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}
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func (v *spaceImpl) AddApplication(app Application) error {
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if v == nil {
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return errors.New("App: Nil space.")
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}
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appType := reflect.TypeOf(app.Interface())
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v.cache[appType] = app
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return nil
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}
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func (s *spaceImpl) Start() error {
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for _, app := range s.cache {
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if err := app.Start(); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *spaceImpl) Close() {
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for _, app := range s.cache {
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app.Close()
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}
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}
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type contextKey int
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const (
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spaceKey = contextKey(0)
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)
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func AddApplicationToSpace(ctx context.Context, appConfig interface{}) error {
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space := SpaceFromContext(ctx)
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if space == nil {
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return errors.New("App: No space in context.")
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}
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application, err := CreateAppFromConfig(ctx, appConfig)
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if err != nil {
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return err
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}
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return space.AddApplication(application)
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}
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func SpaceFromContext(ctx context.Context) Space {
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return ctx.Value(spaceKey).(Space)
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}
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func ContextWithSpace(ctx context.Context, space Space) context.Context {
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return context.WithValue(ctx, spaceKey, space)
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}
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