space with context

app/dns.go

@@ -8,3 +8,21 @@ type DnsCache interface {
 	Get(domain string) net.IP
 	Add(domain string, ip net.IP)
 }
+
+type DnsCacheWithContext interface {
+	Get(context Context, domain string) net.IP
+	Add(contaxt Context, domain string, ip net.IP)
+}
+
+type contextedDnsCache struct {
+	context  Context
+	dnsCache DnsCacheWithContext
+}
+
+func (this *contextedDnsCache) Get(domain string) net.IP {
+	return this.dnsCache.Get(this.context, domain)
+}
+
+func (this *contextedDnsCache) Add(domain string, ip net.IP) {
+	this.dnsCache.Add(this.context, domain, ip)
+}

app/dns/dns.go

@@ -4,6 +4,8 @@ import (
 	"net"
 	"sync"
 	"time"
+
+	"github.com/v2ray/v2ray-core/app"
 )
 
 type entry struct {
@@ -37,7 +39,8 @@ type DnsCache struct {
 
 func NewCache(config CacheConfig) *DnsCache {
 	cache := &DnsCache{
-		cache: make(map[string]*entry),
+		cache:  make(map[string]*entry),
+		config: config,
 	}
 	go cache.cleanup()
 	return cache
@@ -64,7 +67,7 @@ func (this *DnsCache) cleanup() {
 	}
 }
 
-func (this *DnsCache) Add(domain string, ip net.IP) {
+func (this *DnsCache) Add(context app.Context, domain string, ip net.IP) {
 	this.RLock()
 	entry, found := this.cache[domain]
 	this.RUnlock()
@@ -78,7 +81,7 @@ func (this *DnsCache) Add(domain string, ip net.IP) {
 	}
 }
 
-func (this *DnsCache) Get(domain string) net.IP {
+func (this *DnsCache) Get(context app.Context, domain string) net.IP {
 	this.RLock()
 	entry, found := this.cache[domain]
 	this.RUnlock()

app/dns/dns_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/v2ray/v2ray-core/app/dns"
+	apptesting "github.com/v2ray/v2ray-core/app/testing"
 	netassert "github.com/v2ray/v2ray-core/common/net/testing/assert"
 	v2testing "github.com/v2ray/v2ray-core/testing"
 )
@@ -14,10 +15,10 @@ func TestDnsAdd(t *testing.T) {
 
 	domain := "v2ray.com"
 	cache := dns.NewCache(nil)
-	ip := cache.Get(domain)
+	ip := cache.Get(&apptesting.Context{}, domain)
 	netassert.IP(ip).IsNil()
 
-	cache.Add(domain, []byte{1, 2, 3, 4})
-	ip = cache.Get(domain)
+	cache.Add(&apptesting.Context{}, domain, []byte{1, 2, 3, 4})
+	ip = cache.Get(&apptesting.Context{}, domain)
 	netassert.IP(ip).Equals(net.IP([]byte{1, 2, 3, 4}))
 }

app/packet_dispatcher.go

@@ -9,3 +9,16 @@ import (
 type PacketDispatcher interface {
 	DispatchToOutbound(packet v2net.Packet) ray.InboundRay
 }
+
+type PacketDispatcherWithContext interface {
+	DispatchToOutbound(context Context, packet v2net.Packet) ray.InboundRay
+}
+
+type contextedPacketDispatcher struct {
+	context          Context
+	packetDispatcher PacketDispatcherWithContext
+}
+
+func (this *contextedPacketDispatcher) DispatchToOutbound(packet v2net.Packet) ray.InboundRay {
+	return this.packetDispatcher.DispatchToOutbound(this.context, packet)
+}

app/space.go

@@ -1,24 +1,62 @@
 package app
 
-type Space struct {
-	packetDispatcher PacketDispatcher
-	dnsCache         DnsCache
+type Context interface {
+	CallerTag() string
+}
+
+type contextImpl struct {
+	callerTag string
 }
 
-func NewSpace() *Space {
-	return new(Space)
+func (this *contextImpl) CallerTag() string {
+	return this.callerTag
 }
 
-func (this *Space) Bind(object interface{}) {
-	if packetDispatcher, ok := object.(PacketDispatcher); ok {
+type SpaceController struct {
+	packetDispatcher PacketDispatcherWithContext
+	dnsCache         DnsCacheWithContext
+}
+
+func NewSpaceController() *SpaceController {
+	return new(SpaceController)
+}
+
+func (this *SpaceController) Bind(object interface{}) {
+	if packetDispatcher, ok := object.(PacketDispatcherWithContext); ok {
 		this.packetDispatcher = packetDispatcher
 	}
 
-	if dnsCache, ok := object.(DnsCache); ok {
+	if dnsCache, ok := object.(DnsCacheWithContext); ok {
 		this.dnsCache = dnsCache
 	}
 }
 
+func (this *SpaceController) ForContext(tag string) *Space {
+	return newSpace(this, &contextImpl{callerTag: tag})
+}
+
+type Space struct {
+	packetDispatcher PacketDispatcher
+	dnsCache         DnsCache
+}
+
+func newSpace(controller *SpaceController, context Context) *Space {
+	space := new(Space)
+	if controller.packetDispatcher != nil {
+		space.packetDispatcher = &contextedPacketDispatcher{
+			context:          context,
+			packetDispatcher: controller.packetDispatcher,
+		}
+	}
+	if controller.dnsCache != nil {
+		space.dnsCache = &contextedDnsCache{
+			context:  context,
+			dnsCache: controller.dnsCache,
+		}
+	}
+	return space
+}
+
 func (this *Space) HasPacketDispatcher() bool {
 	return this.packetDispatcher != nil
 }

app/testing/space.go

@@ -0,0 +1,9 @@
+package testing
+
+type Context struct {
+	CallerTagValue string
+}
+
+func (this *Context) CallerTag() string {
+	return this.CallerTagValue
+}

shell/point/point.go

@@ -22,7 +22,7 @@ type Point struct {
 	idh    []*InboundDetourHandler
 	odh    map[string]connhandler.OutboundConnectionHandler
 	router router.Router
-	space  *app.Space
+	space  *app.SpaceController
 }
 
 // NewPoint returns a new Point server based on given configuration.
@@ -50,7 +50,7 @@ func NewPoint(pConfig PointConfig) (*Point, error) {
 		log.SetLogLevel(logConfig.LogLevel())
 	}
 
-	vpoint.space = app.NewSpace()
+	vpoint.space = app.NewSpaceController()
 	vpoint.space.Bind(vpoint)
 
 	ichFactory := connhandler.GetInboundConnectionHandlerFactory(pConfig.InboundConfig().Protocol())
@@ -59,7 +59,7 @@ func NewPoint(pConfig PointConfig) (*Point, error) {
 		return nil, BadConfiguration
 	}
 	ichConfig := pConfig.InboundConfig().Settings()
-	ich, err := ichFactory.Create(vpoint.space, ichConfig)
+	ich, err := ichFactory.Create(vpoint.space.ForContext("vpoint-default-inbound"), ichConfig)
 	if err != nil {
 		log.Error("Failed to create inbound connection handler: %v", err)
 		return nil, err
@@ -72,7 +72,7 @@ func NewPoint(pConfig PointConfig) (*Point, error) {
 		return nil, BadConfiguration
 	}
 	ochConfig := pConfig.OutboundConfig().Settings()
-	och, err := ochFactory.Create(vpoint.space, ochConfig)
+	och, err := ochFactory.Create(vpoint.space.ForContext("vpoint-default-outbound"), ochConfig)
 	if err != nil {
 		log.Error("Failed to create outbound connection handler: %v", err)
 		return nil, err
@@ -84,7 +84,7 @@ func NewPoint(pConfig PointConfig) (*Point, error) {
 		vpoint.idh = make([]*InboundDetourHandler, len(detours))
 		for idx, detourConfig := range detours {
 			detourHandler := &InboundDetourHandler{
-				space:  vpoint.space,
+				space:  vpoint.space.ForContext(detourConfig.Tag()),
 				config: detourConfig,
 			}
 			err := detourHandler.Initialize()
@@ -104,7 +104,7 @@ func NewPoint(pConfig PointConfig) (*Point, error) {
 				log.Error("Unknown detour outbound connection handler factory %s", detourConfig.Protocol())
 				return nil, BadConfiguration
 			}
-			detourHandler, err := detourFactory.Create(vpoint.space, detourConfig.Settings())
+			detourHandler, err := detourFactory.Create(vpoint.space.ForContext(detourConfig.Tag()), detourConfig.Settings())
 			if err != nil {
 				log.Error("Failed to create detour outbound connection handler: %v", err)
 				return nil, err
@@ -159,7 +159,7 @@ func (this *Point) Start() error {
 // Dispatches a Packet to an OutboundConnection.
 // The packet will be passed through the router (if configured), and then sent to an outbound
 // connection with matching tag.
-func (this *Point) DispatchToOutbound(packet v2net.Packet) ray.InboundRay {
+func (this *Point) DispatchToOutbound(context app.Context, packet v2net.Packet) ray.InboundRay {
 	direct := ray.NewRay()
 	dest := packet.Destination()