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@DarienRaymond @wuxiangzhou2010 @xihajuan2010 @felixonmars
executable file 325 lines (277 sloc) 7.92 KB
// +build !confonly
package core
import (
"context"
"reflect"
"sync"
"v2ray.com/core/common"
"v2ray.com/core/common/serial"
"v2ray.com/core/features"
"v2ray.com/core/features/dns"
"v2ray.com/core/features/dns/localdns"
"v2ray.com/core/features/inbound"
"v2ray.com/core/features/outbound"
"v2ray.com/core/features/policy"
"v2ray.com/core/features/routing"
"v2ray.com/core/features/stats"
)
// Server is an instance of V2Ray. At any time, there must be at most one Server instance running.
type Server interface {
common.Runnable
}
// ServerType returns the type of the server.
func ServerType() interface{} {
return (*Instance)(nil)
}
type resolution struct {
deps []reflect.Type
callback interface{}
}
func getFeature(allFeatures []features.Feature, t reflect.Type) features.Feature {
for _, f := range allFeatures {
if reflect.TypeOf(f.Type()) == t {
return f
}
}
return nil
}
func (r *resolution) resolve(allFeatures []features.Feature) (bool, error) {
var fs []features.Feature
for _, d := range r.deps {
f := getFeature(allFeatures, d)
if f == nil {
return false, nil
}
fs = append(fs, f)
}
callback := reflect.ValueOf(r.callback)
var input []reflect.Value
callbackType := callback.Type()
for i := 0; i < callbackType.NumIn(); i++ {
pt := callbackType.In(i)
for _, f := range fs {
if reflect.TypeOf(f).AssignableTo(pt) {
input = append(input, reflect.ValueOf(f))
break
}
}
}
if len(input) != callbackType.NumIn() {
panic("Can't get all input parameters")
}
var err error
ret := callback.Call(input)
errInterface := reflect.TypeOf((*error)(nil)).Elem()
for i := len(ret) - 1; i >= 0; i-- {
if ret[i].Type() == errInterface {
v := ret[i].Interface()
if v != nil {
err = v.(error)
}
break
}
}
return true, err
}
// Instance combines all functionalities in V2Ray.
type Instance struct {
access sync.Mutex
features []features.Feature
featureResolutions []resolution
running bool
}
func AddInboundHandler(server *Instance, config *InboundHandlerConfig) error {
inboundManager := server.GetFeature(inbound.ManagerType()).(inbound.Manager)
rawHandler, err := CreateObject(server, config)
if err != nil {
return err
}
handler, ok := rawHandler.(inbound.Handler)
if !ok {
return newError("not an InboundHandler")
}
if err := inboundManager.AddHandler(context.Background(), handler); err != nil {
return err
}
return nil
}
func addInboundHandlers(server *Instance, configs []*InboundHandlerConfig) error {
for _, inboundConfig := range configs {
if err := AddInboundHandler(server, inboundConfig); err != nil {
return err
}
}
return nil
}
func AddOutboundHandler(server *Instance, config *OutboundHandlerConfig) error {
outboundManager := server.GetFeature(outbound.ManagerType()).(outbound.Manager)
rawHandler, err := CreateObject(server, config)
if err != nil {
return err
}
handler, ok := rawHandler.(outbound.Handler)
if !ok {
return newError("not an OutboundHandler")
}
if err := outboundManager.AddHandler(context.Background(), handler); err != nil {
return err
}
return nil
}
func addOutboundHandlers(server *Instance, configs []*OutboundHandlerConfig) error {
for _, outboundConfig := range configs {
if err := AddOutboundHandler(server, outboundConfig); err != nil {
return err
}
}
return nil
}
// RequireFeatures is a helper function to require features from Instance in context.
// See Instance.RequireFeatures for more information.
func RequireFeatures(ctx context.Context, callback interface{}) error {
v := MustFromContext(ctx)
return v.RequireFeatures(callback)
}
// New returns a new V2Ray instance based on given configuration.
// The instance is not started at this point.
// To ensure V2Ray instance works properly, the config must contain one Dispatcher, one InboundHandlerManager and one OutboundHandlerManager. Other features are optional.
func New(config *Config) (*Instance, error) {
var server = &Instance{}
if config.Transport != nil {
features.PrintDeprecatedFeatureWarning("global transport settings")
}
if err := config.Transport.Apply(); err != nil {
return nil, err
}
for _, appSettings := range config.App {
settings, err := appSettings.GetInstance()
if err != nil {
return nil, err
}
obj, err := CreateObject(server, settings)
if err != nil {
return nil, err
}
if feature, ok := obj.(features.Feature); ok {
if err := server.AddFeature(feature); err != nil {
return nil, err
}
}
}
essentialFeatures := []struct {
Type interface{}
Instance features.Feature
}{
{dns.ClientType(), localdns.New()},
{policy.ManagerType(), policy.DefaultManager{}},
{routing.RouterType(), routing.DefaultRouter{}},
{stats.ManagerType(), stats.NoopManager{}},
}
for _, f := range essentialFeatures {
if server.GetFeature(f.Type) == nil {
if err := server.AddFeature(f.Instance); err != nil {
return nil, err
}
}
}
if server.featureResolutions != nil {
return nil, newError("not all dependency are resolved.")
}
if err := addInboundHandlers(server, config.Inbound); err != nil {
return nil, err
}
if err := addOutboundHandlers(server, config.Outbound); err != nil {
return nil, err
}
return server, nil
}
// Type implements common.HasType.
func (s *Instance) Type() interface{} {
return ServerType()
}
// Close shutdown the V2Ray instance.
func (s *Instance) Close() error {
s.access.Lock()
defer s.access.Unlock()
s.running = false
var errors []interface{}
for _, f := range s.features {
if err := f.Close(); err != nil {
errors = append(errors, err)
}
}
if len(errors) > 0 {
return newError("failed to close all features").Base(newError(serial.Concat(errors...)))
}
return nil
}
// RequireFeatures registers a callback, which will be called when all dependent features are registered.
// The callback must be a func(). All its parameters must be features.Feature.
func (s *Instance) RequireFeatures(callback interface{}) error {
callbackType := reflect.TypeOf(callback)
if callbackType.Kind() != reflect.Func {
panic("not a function")
}
var featureTypes []reflect.Type
for i := 0; i < callbackType.NumIn(); i++ {
featureTypes = append(featureTypes, reflect.PtrTo(callbackType.In(i)))
}
r := resolution{
deps: featureTypes,
callback: callback,
}
if finished, err := r.resolve(s.features); finished {
return err
}
s.featureResolutions = append(s.featureResolutions, r)
return nil
}
// AddFeature registers a feature into current Instance.
func (s *Instance) AddFeature(feature features.Feature) error {
s.features = append(s.features, feature)
if s.running {
if err := feature.Start(); err != nil {
newError("failed to start feature").Base(err).WriteToLog()
}
return nil
}
if s.featureResolutions == nil {
return nil
}
var pendingResolutions []resolution
for _, r := range s.featureResolutions {
finished, err := r.resolve(s.features)
if finished && err != nil {
return err
}
if !finished {
pendingResolutions = append(pendingResolutions, r)
}
}
if len(pendingResolutions) == 0 {
s.featureResolutions = nil
} else if len(pendingResolutions) < len(s.featureResolutions) {
s.featureResolutions = pendingResolutions
}
return nil
}
// GetFeature returns a feature of the given type, or nil if such feature is not registered.
func (s *Instance) GetFeature(featureType interface{}) features.Feature {
return getFeature(s.features, reflect.TypeOf(featureType))
}
// Start starts the V2Ray instance, including all registered features. When Start returns error, the state of the instance is unknown.
// A V2Ray instance can be started only once. Upon closing, the instance is not guaranteed to start again.
//
// v2ray:api:stable
func (s *Instance) Start() error {
s.access.Lock()
defer s.access.Unlock()
s.running = true
for _, f := range s.features {
if err := f.Start(); err != nil {
return err
}
}
newError("V2Ray ", Version(), " started").AtWarning().WriteToLog()
return nil
}
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