From 9cb1566a788856b93f2364e387fe61e513d9d735 Mon Sep 17 00:00:00 2001
From: Shelikhoo <xiaokangwang@outlook.com>
Date: Fri, 18 Jun 2021 17:39:13 +0100
Subject: [PATCH] moving health ping to observatory as a standalone component

---
 app/observatory/burst/burst.go                |  14 +
 app/observatory/burst/burstobserver.go        | 105 +++++++
 app/observatory/burst/config.proto            |  29 ++
 .../burst}/healthping.go                      |  22 +-
 .../burst}/healthping_result.go               |   2 +-
 .../burst}/healthping_result_test.go          |  19 +-
 app/{router => observatory/burst}/ping.go     |  24 +-
 app/observatory/config.proto                  |  13 +-
 app/router/config.pb.go                       | 263 +++++-------------
 app/router/config.proto                       |  15 -
 app/router/router.go                          |  14 -
 app/router/strategy_leastload.go              |  14 +-
 common/session/context.go                     |  13 -
 common/session/session.go                     |   6 -
 14 files changed, 260 insertions(+), 293 deletions(-)
 create mode 100644 app/observatory/burst/burst.go
 create mode 100644 app/observatory/burst/burstobserver.go
 create mode 100644 app/observatory/burst/config.proto
 rename app/{router => observatory/burst}/healthping.go (93%)
 rename app/{router => observatory/burst}/healthping_result.go (99%)
 rename app/{router => observatory/burst}/healthping_result_test.go (84%)
 rename app/{router => observatory/burst}/ping.go (65%)

diff --git a/app/observatory/burst/burst.go b/app/observatory/burst/burst.go
new file mode 100644
index 000000000..13eb0fd60
--- /dev/null
+++ b/app/observatory/burst/burst.go
@@ -0,0 +1,14 @@
+package burst
+
+import (
+	"math"
+	"time"
+)
+
+//go:generate go run github.com/v2fly/v2ray-core/v4/common/errors/errorgen
+
+const (
+	rttFailed = time.Duration(math.MaxInt64 - iota)
+	rttUntested
+	rttUnqualified
+)
diff --git a/app/observatory/burst/burstobserver.go b/app/observatory/burst/burstobserver.go
new file mode 100644
index 000000000..85d38ace9
--- /dev/null
+++ b/app/observatory/burst/burstobserver.go
@@ -0,0 +1,105 @@
+package burst
+
+import (
+	"context"
+	core "github.com/v2fly/v2ray-core/v4"
+	"github.com/v2fly/v2ray-core/v4/app/observatory"
+	"github.com/v2fly/v2ray-core/v4/common"
+	"github.com/v2fly/v2ray-core/v4/common/signal/done"
+	"github.com/v2fly/v2ray-core/v4/features/extension"
+	"github.com/v2fly/v2ray-core/v4/features/outbound"
+	"google.golang.org/protobuf/proto"
+	"sync"
+)
+
+type Observer struct {
+	config *Config
+	ctx    context.Context
+
+	statusLock sync.Mutex
+	hp         *HealthPing
+
+	finished *done.Instance
+
+	ohm outbound.Manager
+}
+
+func (o *Observer) GetObservation(ctx context.Context) (proto.Message, error) {
+	return &observatory.ObservationResult{Status: o.createResult()}, nil
+}
+
+func (o *Observer) createResult() []*observatory.OutboundStatus {
+	var result []*observatory.OutboundStatus
+	o.hp.access.Lock()
+	defer o.hp.access.Unlock()
+	for name, value := range o.hp.Results {
+		status := observatory.OutboundStatus{
+			Alive:           value.getStatistics().All == value.getStatistics().Fail,
+			Delay:           value.getStatistics().Average.Milliseconds(),
+			LastErrorReason: "",
+			OutboundTag:     name,
+			LastSeenTime:    0,
+			LastTryTime:     0,
+			HealthPing: &observatory.HealthPingMeasurementResult{
+				All:       int64(value.getStatistics().All),
+				Fail:      int64(value.getStatistics().Fail),
+				Deviation: int64(value.getStatistics().Deviation),
+				Average:   int64(value.getStatistics().Average),
+				Max:       int64(value.getStatistics().Max),
+				Min:       int64(value.getStatistics().Min),
+			},
+		}
+		result = append(result, &status)
+	}
+	return result
+}
+
+func (o *Observer) Type() interface{} {
+	return extension.ObservatoryType()
+}
+
+func (o *Observer) Start() error {
+	if o.config != nil && len(o.config.SubjectSelector) != 0 {
+		o.finished = done.New()
+		o.hp.StartScheduler(func() ([]string, error) {
+			hs, ok := o.ohm.(outbound.HandlerSelector)
+			if !ok {
+
+				return nil, newError("outbound.Manager is not a HandlerSelector")
+			}
+
+			outbounds := hs.Select(o.config.SubjectSelector)
+			return outbounds, nil
+		})
+	}
+	return nil
+}
+
+func (o *Observer) Close() error {
+	if o.finished != nil {
+		o.hp.StopScheduler()
+		return o.finished.Close()
+	}
+	return nil
+}
+
+func New(ctx context.Context, config *Config) (*Observer, error) {
+	var outboundManager outbound.Manager
+	err := core.RequireFeatures(ctx, func(om outbound.Manager) {
+		outboundManager = om
+	})
+	if err != nil {
+		return nil, newError("Cannot get depended features").Base(err)
+	}
+	return &Observer{
+		config: config,
+		ctx:    ctx,
+		ohm:    outboundManager,
+	}, nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+}
diff --git a/app/observatory/burst/config.proto b/app/observatory/burst/config.proto
new file mode 100644
index 000000000..70c16039c
--- /dev/null
+++ b/app/observatory/burst/config.proto
@@ -0,0 +1,29 @@
+syntax = "proto3";
+
+package v2ray.core.app.observatory.burst;
+option csharp_namespace = "V2Ray.Core.App.Observatory.Burst";
+option go_package = "github.com/v2fly/v2ray-core/v4/app/observatory/burst";
+option java_package = "com.v2ray.core.app.observatory.burst";
+option java_multiple_files = true;
+
+message Config {
+  /* @Document The selectors for outbound under observation
+  */
+  repeated string subject_selector = 2;
+
+  HealthPingConfig ping_config = 3;
+}
+
+message HealthPingConfig {
+  // destination url, need 204 for success return
+  // default http://www.google.com/gen_204
+  string destination = 1;
+  // connectivity check url
+  string connectivity = 2;
+  // health check interval, int64 values of time.Duration
+  int64 interval = 3;
+  // sampling count is the amount of recent ping results which are kept for calculation
+  int32 samplingCount = 4;
+  // ping timeout, int64 values of time.Duration
+  int64 timeout = 5;
+}
\ No newline at end of file
diff --git a/app/router/healthping.go b/app/observatory/burst/healthping.go
similarity index 93%
rename from app/router/healthping.go
rename to app/observatory/burst/healthping.go
index 1c7ce4a86..6f88cff50 100644
--- a/app/router/healthping.go
+++ b/app/observatory/burst/healthping.go
@@ -1,13 +1,13 @@
-package router
+package burst
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	sync "sync"
 	"time"
 
 	"github.com/v2fly/v2ray-core/v4/common/dice"
-	"github.com/v2fly/v2ray-core/v4/features/routing"
 )
 
 // HealthPingSettings holds settings for health Checker
@@ -21,16 +21,16 @@ type HealthPingSettings struct {
 
 // HealthPing is the health checker for balancers
 type HealthPing struct {
-	access     sync.Mutex
-	ticker     *time.Ticker
-	dispatcher routing.Dispatcher
+	ctx    context.Context
+	access sync.Mutex
+	ticker *time.Ticker
 
 	Settings *HealthPingSettings
 	Results  map[string]*HealthPingRTTS
 }
 
 // NewHealthPing creates a new HealthPing with settings
-func NewHealthPing(config *HealthPingConfig, dispatcher routing.Dispatcher) *HealthPing {
+func NewHealthPing(ctx context.Context, config *HealthPingConfig) *HealthPing {
 	settings := &HealthPingSettings{}
 	if config != nil {
 		settings = &HealthPingSettings{
@@ -59,9 +59,9 @@ func NewHealthPing(config *HealthPingConfig, dispatcher routing.Dispatcher) *Hea
 		settings.Timeout = time.Duration(5) * time.Second
 	}
 	return &HealthPing{
-		dispatcher: dispatcher,
-		Settings:   settings,
-		Results:    nil,
+		ctx:      ctx,
+		Settings: settings,
+		Results:  nil,
 	}
 }
 
@@ -121,14 +121,14 @@ func (h *HealthPing) doCheck(tags []string, duration time.Duration, rounds int)
 		return
 	}
 	ch := make(chan *rtt, count)
-	// rtts := make(map[string][]time.Duration)
+
 	for _, tag := range tags {
 		handler := tag
 		client := newPingClient(
+			h.ctx,
 			h.Settings.Destination,
 			h.Settings.Timeout,
 			handler,
-			h.dispatcher,
 		)
 		for i := 0; i < rounds; i++ {
 			delay := time.Duration(0)
diff --git a/app/router/healthping_result.go b/app/observatory/burst/healthping_result.go
similarity index 99%
rename from app/router/healthping_result.go
rename to app/observatory/burst/healthping_result.go
index a419fd80c..f48d37b60 100644
--- a/app/router/healthping_result.go
+++ b/app/observatory/burst/healthping_result.go
@@ -1,4 +1,4 @@
-package router
+package burst
 
 import (
 	"math"
diff --git a/app/router/healthping_result_test.go b/app/observatory/burst/healthping_result_test.go
similarity index 84%
rename from app/router/healthping_result_test.go
rename to app/observatory/burst/healthping_result_test.go
index decdde6bf..8dae359a3 100644
--- a/app/router/healthping_result_test.go
+++ b/app/observatory/burst/healthping_result_test.go
@@ -1,22 +1,21 @@
-package router_test
+package burst_test
 
 import (
+	"github.com/v2fly/v2ray-core/v4/app/observatory/burst"
 	"math"
 	reflect "reflect"
 	"testing"
 	"time"
-
-	"github.com/v2fly/v2ray-core/v4/app/router"
 )
 
 func TestHealthPingResults(t *testing.T) {
 	rtts := []int64{60, 140, 60, 140, 60, 60, 140, 60, 140}
-	hr := router.NewHealthPingResult(4, time.Hour)
+	hr := burst.NewHealthPingResult(4, time.Hour)
 	for _, rtt := range rtts {
 		hr.Put(time.Duration(rtt))
 	}
 	rttFailed := time.Duration(math.MaxInt64)
-	expected := &router.HealthPingStats{
+	expected := &burst.HealthPingStats{
 		All:       4,
 		Fail:      0,
 		Deviation: 40,
@@ -37,7 +36,7 @@ func TestHealthPingResults(t *testing.T) {
 	}
 	hr.Put(rttFailed)
 	hr.Put(rttFailed)
-	expected = &router.HealthPingStats{
+	expected = &burst.HealthPingStats{
 		All:       4,
 		Fail:      4,
 		Deviation: 0,
@@ -53,7 +52,7 @@ func TestHealthPingResults(t *testing.T) {
 
 func TestHealthPingResultsIgnoreOutdated(t *testing.T) {
 	rtts := []int64{60, 140, 60, 140}
-	hr := router.NewHealthPingResult(4, time.Duration(10)*time.Millisecond)
+	hr := burst.NewHealthPingResult(4, time.Duration(10)*time.Millisecond)
 	for i, rtt := range rtts {
 		if i == 2 {
 			// wait for previous 2 outdated
@@ -62,7 +61,7 @@ func TestHealthPingResultsIgnoreOutdated(t *testing.T) {
 		hr.Put(time.Duration(rtt))
 	}
 	hr.Get()
-	expected := &router.HealthPingStats{
+	expected := &burst.HealthPingStats{
 		All:       2,
 		Fail:      0,
 		Deviation: 40,
@@ -76,7 +75,7 @@ func TestHealthPingResultsIgnoreOutdated(t *testing.T) {
 	}
 	// wait for all outdated
 	time.Sleep(time.Duration(10) * time.Millisecond)
-	expected = &router.HealthPingStats{
+	expected = &burst.HealthPingStats{
 		All:       0,
 		Fail:      0,
 		Deviation: 0,
@@ -90,7 +89,7 @@ func TestHealthPingResultsIgnoreOutdated(t *testing.T) {
 	}
 
 	hr.Put(time.Duration(60))
-	expected = &router.HealthPingStats{
+	expected = &burst.HealthPingStats{
 		All:  1,
 		Fail: 0,
 		// 1 sample, std=0.5rtt
diff --git a/app/router/ping.go b/app/observatory/burst/ping.go
similarity index 65%
rename from app/router/ping.go
rename to app/observatory/burst/ping.go
index ba192264a..41dde8da6 100644
--- a/app/router/ping.go
+++ b/app/observatory/burst/ping.go
@@ -1,13 +1,12 @@
-package router
+package burst
 
 import (
 	"context"
+	"github.com/v2fly/v2ray-core/v4/transport/internet/tagged"
 	"net/http"
 	"time"
 
 	"github.com/v2fly/v2ray-core/v4/common/net"
-	"github.com/v2fly/v2ray-core/v4/common/session"
-	"github.com/v2fly/v2ray-core/v4/features/routing"
 )
 
 type pingClient struct {
@@ -15,10 +14,10 @@ type pingClient struct {
 	httpClient  *http.Client
 }
 
-func newPingClient(destination string, timeout time.Duration, handler string, dispatcher routing.Dispatcher) *pingClient {
+func newPingClient(ctx context.Context, destination string, timeout time.Duration, handler string) *pingClient {
 	return &pingClient{
 		destination: destination,
-		httpClient:  newHTTPClient(handler, dispatcher, timeout),
+		httpClient:  newHTTPClient(ctx, handler, timeout),
 	}
 }
 
@@ -29,7 +28,7 @@ func newDirectPingClient(destination string, timeout time.Duration) *pingClient
 	}
 }
 
-func newHTTPClient(handler string, dispatcher routing.Dispatcher, timeout time.Duration) *http.Client {
+func newHTTPClient(ctxv context.Context, handler string, timeout time.Duration) *http.Client {
 	tr := &http.Transport{
 		DisableKeepAlives: true,
 		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
@@ -37,18 +36,7 @@ func newHTTPClient(handler string, dispatcher routing.Dispatcher, timeout time.D
 			if err != nil {
 				return nil, err
 			}
-			h := &session.Handler{
-				Tag: handler,
-			}
-			ctx = session.ContextWithHandler(ctx, h)
-			link, err := dispatcher.Dispatch(ctx, dest)
-			if err != nil {
-				return nil, err
-			}
-			return net.NewConnection(
-				net.ConnectionInputMulti(link.Writer),
-				net.ConnectionOutputMulti(link.Reader),
-			), nil
+			return tagged.Dialer(ctxv, dest, handler)
 		},
 	}
 	return &http.Client{
diff --git a/app/observatory/config.proto b/app/observatory/config.proto
index 249674556..2ec56c88c 100644
--- a/app/observatory/config.proto
+++ b/app/observatory/config.proto
@@ -7,7 +7,16 @@ option java_package = "com.v2ray.core.app.observatory";
 option java_multiple_files = true;
 
 message ObservationResult {
-    repeated OutboundStatus status = 1;
+  repeated OutboundStatus status = 1;
+}
+
+message HealthPingMeasurementResult {
+  int64 all = 1;
+  int64 fail = 2;
+  int64 deviation = 3;
+  int64 average = 4;
+  int64 max = 5;
+  int64 min = 6;
 }
 
 message OutboundStatus{
@@ -36,6 +45,8 @@ message OutboundStatus{
    @Type id.outboundTag
 */
   int64 last_try_time = 6;
+
+  HealthPingMeasurementResult health_ping = 7;
 }
 
 message ProbeResult{
diff --git a/app/router/config.pb.go b/app/router/config.pb.go
index a20b94791..07f006039 100644
--- a/app/router/config.pb.go
+++ b/app/router/config.pb.go
@@ -132,7 +132,7 @@ func (x Config_DomainStrategy) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use Config_DomainStrategy.Descriptor instead.
 func (Config_DomainStrategy) EnumDescriptor() ([]byte, []int) {
-	return file_app_router_config_proto_rawDescGZIP(), []int{11, 0}
+	return file_app_router_config_proto_rawDescGZIP(), []int{10, 0}
 }
 
 // Domain for routing decision.
@@ -849,7 +849,6 @@ type StrategyLeastLoadConfig struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	HealthCheck *HealthPingConfig `protobuf:"bytes,1,opt,name=healthCheck,proto3" json:"healthCheck,omitempty"`
 	// weight settings
 	Costs []*StrategyWeight `protobuf:"bytes,2,rep,name=costs,proto3" json:"costs,omitempty"`
 	// RTT baselines for selecting, int64 values of time.Duration
@@ -894,13 +893,6 @@ func (*StrategyLeastLoadConfig) Descriptor() ([]byte, []int) {
 	return file_app_router_config_proto_rawDescGZIP(), []int{9}
 }
 
-func (x *StrategyLeastLoadConfig) GetHealthCheck() *HealthPingConfig {
-	if x != nil {
-		return x.HealthCheck
-	}
-	return nil
-}
-
 func (x *StrategyLeastLoadConfig) GetCosts() []*StrategyWeight {
 	if x != nil {
 		return x.Costs
@@ -936,91 +928,6 @@ func (x *StrategyLeastLoadConfig) GetTolerance() float32 {
 	return 0
 }
 
-type HealthPingConfig struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// destination url, need 204 for success return
-	// default http://www.google.com/gen_204
-	Destination string `protobuf:"bytes,1,opt,name=destination,proto3" json:"destination,omitempty"`
-	// connectivity check url
-	Connectivity string `protobuf:"bytes,2,opt,name=connectivity,proto3" json:"connectivity,omitempty"`
-	// health check interval, int64 values of time.Duration
-	Interval int64 `protobuf:"varint,3,opt,name=interval,proto3" json:"interval,omitempty"`
-	// samplingcount is the amount of recent ping results which are kept for calculation
-	SamplingCount int32 `protobuf:"varint,4,opt,name=samplingCount,proto3" json:"samplingCount,omitempty"`
-	// ping timeout, int64 values of time.Duration
-	Timeout int64 `protobuf:"varint,5,opt,name=timeout,proto3" json:"timeout,omitempty"`
-}
-
-func (x *HealthPingConfig) Reset() {
-	*x = HealthPingConfig{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_config_proto_msgTypes[10]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *HealthPingConfig) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*HealthPingConfig) ProtoMessage() {}
-
-func (x *HealthPingConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_config_proto_msgTypes[10]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use HealthPingConfig.ProtoReflect.Descriptor instead.
-func (*HealthPingConfig) Descriptor() ([]byte, []int) {
-	return file_app_router_config_proto_rawDescGZIP(), []int{10}
-}
-
-func (x *HealthPingConfig) GetDestination() string {
-	if x != nil {
-		return x.Destination
-	}
-	return ""
-}
-
-func (x *HealthPingConfig) GetConnectivity() string {
-	if x != nil {
-		return x.Connectivity
-	}
-	return ""
-}
-
-func (x *HealthPingConfig) GetInterval() int64 {
-	if x != nil {
-		return x.Interval
-	}
-	return 0
-}
-
-func (x *HealthPingConfig) GetSamplingCount() int32 {
-	if x != nil {
-		return x.SamplingCount
-	}
-	return 0
-}
-
-func (x *HealthPingConfig) GetTimeout() int64 {
-	if x != nil {
-		return x.Timeout
-	}
-	return 0
-}
-
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1034,7 +941,7 @@ type Config struct {
 func (x *Config) Reset() {
 	*x = Config{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_config_proto_msgTypes[11]
+		mi := &file_app_router_config_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1047,7 +954,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_config_proto_msgTypes[11]
+	mi := &file_app_router_config_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1060,7 +967,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_app_router_config_proto_rawDescGZIP(), []int{11}
+	return file_app_router_config_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *Config) GetDomainStrategy() Config_DomainStrategy {
@@ -1099,7 +1006,7 @@ type Domain_Attribute struct {
 func (x *Domain_Attribute) Reset() {
 	*x = Domain_Attribute{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_config_proto_msgTypes[12]
+		mi := &file_app_router_config_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1112,7 +1019,7 @@ func (x *Domain_Attribute) String() string {
 func (*Domain_Attribute) ProtoMessage() {}
 
 func (x *Domain_Attribute) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_config_proto_msgTypes[12]
+	mi := &file_app_router_config_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1304,61 +1211,45 @@ var file_app_router_config_proto_rawDesc = []byte{
 	0x06, 0x72, 0x65, 0x67, 0x65, 0x78, 0x70, 0x12, 0x14, 0x0a, 0x05, 0x6d, 0x61, 0x74, 0x63, 0x68,
 	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x12, 0x14, 0x0a,
 	0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x02, 0x52, 0x05, 0x76, 0x61,
-	0x6c, 0x75, 0x65, 0x22, 0x91, 0x02, 0x0a, 0x17, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79,
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 }
 
 var (
@@ -1374,7 +1265,7 @@ func file_app_router_config_proto_rawDescGZIP() []byte {
 }
 
 var file_app_router_config_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_app_router_config_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_app_router_config_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_app_router_config_proto_goTypes = []interface{}{
 	(Domain_Type)(0),                // 0: v2ray.core.app.router.Domain.Type
 	(Config_DomainStrategy)(0),      // 1: v2ray.core.app.router.Config.DomainStrategy
@@ -1388,18 +1279,17 @@ var file_app_router_config_proto_goTypes = []interface{}{
 	(*BalancingRule)(nil),           // 9: v2ray.core.app.router.BalancingRule
 	(*StrategyWeight)(nil),          // 10: v2ray.core.app.router.StrategyWeight
 	(*StrategyLeastLoadConfig)(nil), // 11: v2ray.core.app.router.StrategyLeastLoadConfig
-	(*HealthPingConfig)(nil),        // 12: v2ray.core.app.router.HealthPingConfig
-	(*Config)(nil),                  // 13: v2ray.core.app.router.Config
-	(*Domain_Attribute)(nil),        // 14: v2ray.core.app.router.Domain.Attribute
-	(*net.PortRange)(nil),           // 15: v2ray.core.common.net.PortRange
-	(*net.PortList)(nil),            // 16: v2ray.core.common.net.PortList
-	(*net.NetworkList)(nil),         // 17: v2ray.core.common.net.NetworkList
-	(net.Network)(0),                // 18: v2ray.core.common.net.Network
-	(*serial.TypedMessage)(nil),     // 19: v2ray.core.common.serial.TypedMessage
+	(*Config)(nil),                  // 12: v2ray.core.app.router.Config
+	(*Domain_Attribute)(nil),        // 13: v2ray.core.app.router.Domain.Attribute
+	(*net.PortRange)(nil),           // 14: v2ray.core.common.net.PortRange
+	(*net.PortList)(nil),            // 15: v2ray.core.common.net.PortList
+	(*net.NetworkList)(nil),         // 16: v2ray.core.common.net.NetworkList
+	(net.Network)(0),                // 17: v2ray.core.common.net.Network
+	(*serial.TypedMessage)(nil),     // 18: v2ray.core.common.serial.TypedMessage
 }
 var file_app_router_config_proto_depIdxs = []int32{
 	0,  // 0: v2ray.core.app.router.Domain.type:type_name -> v2ray.core.app.router.Domain.Type
-	14, // 1: v2ray.core.app.router.Domain.attribute:type_name -> v2ray.core.app.router.Domain.Attribute
+	13, // 1: v2ray.core.app.router.Domain.attribute:type_name -> v2ray.core.app.router.Domain.Attribute
 	3,  // 2: v2ray.core.app.router.GeoIP.cidr:type_name -> v2ray.core.app.router.CIDR
 	4,  // 3: v2ray.core.app.router.GeoIPList.entry:type_name -> v2ray.core.app.router.GeoIP
 	2,  // 4: v2ray.core.app.router.GeoSite.domain:type_name -> v2ray.core.app.router.Domain
@@ -1407,24 +1297,23 @@ var file_app_router_config_proto_depIdxs = []int32{
 	2,  // 6: v2ray.core.app.router.RoutingRule.domain:type_name -> v2ray.core.app.router.Domain
 	3,  // 7: v2ray.core.app.router.RoutingRule.cidr:type_name -> v2ray.core.app.router.CIDR
 	4,  // 8: v2ray.core.app.router.RoutingRule.geoip:type_name -> v2ray.core.app.router.GeoIP
-	15, // 9: v2ray.core.app.router.RoutingRule.port_range:type_name -> v2ray.core.common.net.PortRange
-	16, // 10: v2ray.core.app.router.RoutingRule.port_list:type_name -> v2ray.core.common.net.PortList
-	17, // 11: v2ray.core.app.router.RoutingRule.network_list:type_name -> v2ray.core.common.net.NetworkList
-	18, // 12: v2ray.core.app.router.RoutingRule.networks:type_name -> v2ray.core.common.net.Network
+	14, // 9: v2ray.core.app.router.RoutingRule.port_range:type_name -> v2ray.core.common.net.PortRange
+	15, // 10: v2ray.core.app.router.RoutingRule.port_list:type_name -> v2ray.core.common.net.PortList
+	16, // 11: v2ray.core.app.router.RoutingRule.network_list:type_name -> v2ray.core.common.net.NetworkList
+	17, // 12: v2ray.core.app.router.RoutingRule.networks:type_name -> v2ray.core.common.net.Network
 	3,  // 13: v2ray.core.app.router.RoutingRule.source_cidr:type_name -> v2ray.core.app.router.CIDR
 	4,  // 14: v2ray.core.app.router.RoutingRule.source_geoip:type_name -> v2ray.core.app.router.GeoIP
-	16, // 15: v2ray.core.app.router.RoutingRule.source_port_list:type_name -> v2ray.core.common.net.PortList
-	19, // 16: v2ray.core.app.router.BalancingRule.strategy_settings:type_name -> v2ray.core.common.serial.TypedMessage
-	12, // 17: v2ray.core.app.router.StrategyLeastLoadConfig.healthCheck:type_name -> v2ray.core.app.router.HealthPingConfig
-	10, // 18: v2ray.core.app.router.StrategyLeastLoadConfig.costs:type_name -> v2ray.core.app.router.StrategyWeight
-	1,  // 19: v2ray.core.app.router.Config.domain_strategy:type_name -> v2ray.core.app.router.Config.DomainStrategy
-	8,  // 20: v2ray.core.app.router.Config.rule:type_name -> v2ray.core.app.router.RoutingRule
-	9,  // 21: v2ray.core.app.router.Config.balancing_rule:type_name -> v2ray.core.app.router.BalancingRule
-	22, // [22:22] is the sub-list for method output_type
-	22, // [22:22] is the sub-list for method input_type
-	22, // [22:22] is the sub-list for extension type_name
-	22, // [22:22] is the sub-list for extension extendee
-	0,  // [0:22] is the sub-list for field type_name
+	15, // 15: v2ray.core.app.router.RoutingRule.source_port_list:type_name -> v2ray.core.common.net.PortList
+	18, // 16: v2ray.core.app.router.BalancingRule.strategy_settings:type_name -> v2ray.core.common.serial.TypedMessage
+	10, // 17: v2ray.core.app.router.StrategyLeastLoadConfig.costs:type_name -> v2ray.core.app.router.StrategyWeight
+	1,  // 18: v2ray.core.app.router.Config.domain_strategy:type_name -> v2ray.core.app.router.Config.DomainStrategy
+	8,  // 19: v2ray.core.app.router.Config.rule:type_name -> v2ray.core.app.router.RoutingRule
+	9,  // 20: v2ray.core.app.router.Config.balancing_rule:type_name -> v2ray.core.app.router.BalancingRule
+	21, // [21:21] is the sub-list for method output_type
+	21, // [21:21] is the sub-list for method input_type
+	21, // [21:21] is the sub-list for extension type_name
+	21, // [21:21] is the sub-list for extension extendee
+	0,  // [0:21] is the sub-list for field type_name
 }
 
 func init() { file_app_router_config_proto_init() }
@@ -1554,18 +1443,6 @@ func file_app_router_config_proto_init() {
 			}
 		}
 		file_app_router_config_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HealthPingConfig); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_app_router_config_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Config); i {
 			case 0:
 				return &v.state
@@ -1577,7 +1454,7 @@ func file_app_router_config_proto_init() {
 				return nil
 			}
 		}
-		file_app_router_config_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+		file_app_router_config_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Domain_Attribute); i {
 			case 0:
 				return &v.state
@@ -1594,7 +1471,7 @@ func file_app_router_config_proto_init() {
 		(*RoutingRule_Tag)(nil),
 		(*RoutingRule_BalancingTag)(nil),
 	}
-	file_app_router_config_proto_msgTypes[12].OneofWrappers = []interface{}{
+	file_app_router_config_proto_msgTypes[11].OneofWrappers = []interface{}{
 		(*Domain_Attribute_BoolValue)(nil),
 		(*Domain_Attribute_IntValue)(nil),
 	}
@@ -1604,7 +1481,7 @@ func file_app_router_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_router_config_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   13,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/app/router/config.proto b/app/router/config.proto
index f7de591d9..23d86d4c9 100644
--- a/app/router/config.proto
+++ b/app/router/config.proto
@@ -140,7 +140,6 @@ message StrategyWeight {
 }
 
 message StrategyLeastLoadConfig {
-  HealthPingConfig healthCheck = 1;
   // weight settings
   repeated StrategyWeight costs = 2;
   // RTT baselines for selecting, int64 values of time.Duration
@@ -153,20 +152,6 @@ message StrategyLeastLoadConfig {
   float tolerance = 6;
 }
 
-message HealthPingConfig {
-  // destination url, need 204 for success return
-  // default http://www.google.com/gen_204
-  string destination = 1;
-  // connectivity check url
-  string connectivity = 2;
-  // health check interval, int64 values of time.Duration
-  int64 interval = 3;
-  // samplingcount is the amount of recent ping results which are kept for calculation
-  int32 samplingCount = 4;
-  // ping timeout, int64 values of time.Duration
-  int64 timeout = 5;
-}
-
 message Config {
   enum DomainStrategy {
     // Use domain as is.
diff --git a/app/router/router.go b/app/router/router.go
index d09e9e144..569dba67b 100644
--- a/app/router/router.go
+++ b/app/router/router.go
@@ -114,25 +114,11 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 
 // Start implements common.Runnable.
 func (r *Router) Start() error {
-	for _, b := range r.balancers {
-		checker, ok := b.strategy.(routing.HealthChecker)
-		if !ok {
-			continue
-		}
-		checker.StartScheduler(b.SelectOutbounds)
-	}
 	return nil
 }
 
 // Close implements common.Closable.
 func (r *Router) Close() error {
-	for _, b := range r.balancers {
-		checker, ok := b.strategy.(routing.HealthChecker)
-		if !ok {
-			continue
-		}
-		checker.StopScheduler()
-	}
 	return nil
 }
 
diff --git a/app/router/strategy_leastload.go b/app/router/strategy_leastload.go
index 9a45270d1..bc13f9a78 100644
--- a/app/router/strategy_leastload.go
+++ b/app/router/strategy_leastload.go
@@ -2,6 +2,7 @@ package router
 
 import (
 	"fmt"
+	"github.com/v2fly/v2ray-core/v4/app/observatory/burst"
 	"math"
 	"sort"
 	"strings"
@@ -11,16 +12,8 @@ import (
 	"github.com/v2fly/v2ray-core/v4/features/routing"
 )
 
-const (
-	rttFailed = time.Duration(math.MaxInt64 - iota)
-	rttUntested
-	rttUnqualified
-)
-
-// LeastLoadStrategy represents a random balancing strategy
+// LeastLoadStrategy represents a least load balancing strategy
 type LeastLoadStrategy struct {
-	*HealthPing
-
 	settings *StrategyLeastLoadConfig
 	costs    *WeightManager
 }
@@ -28,8 +21,7 @@ type LeastLoadStrategy struct {
 // NewLeastLoadStrategy creates a new LeastLoadStrategy with settings
 func NewLeastLoadStrategy(settings *StrategyLeastLoadConfig, dispatcher routing.Dispatcher) *LeastLoadStrategy {
 	return &LeastLoadStrategy{
-		HealthPing: NewHealthPing(settings.HealthCheck, dispatcher),
-		settings:   settings,
+		settings: settings,
 		costs: NewWeightManager(
 			settings.Costs, 1,
 			func(value, cost float64) float64 {
diff --git a/common/session/context.go b/common/session/context.go
index 04266b59a..2e43b9205 100644
--- a/common/session/context.go
+++ b/common/session/context.go
@@ -133,16 +133,3 @@ func SubmitOutboundErrorToOriginator(ctx context.Context, err error) {
 func TrackedConnectionError(ctx context.Context, tracker TrackedRequestErrorFeedback) context.Context {
 	return context.WithValue(ctx, trackedConnectionErrorKey, tracker)
 }
-
-// ContextWithHandler returns a new context with handler
-func ContextWithHandler(ctx context.Context, handler *Handler) context.Context {
-	return context.WithValue(ctx, handlerSessionKey, handler)
-}
-
-// HandlerFromContext returns handler config in this context, or nil if not
-func HandlerFromContext(ctx context.Context) *Handler {
-	if handler, ok := ctx.Value(handlerSessionKey).(*Handler); ok {
-		return handler
-	}
-	return nil
-}
diff --git a/common/session/session.go b/common/session/session.go
index 5e9c0afc9..2ee5cc46e 100644
--- a/common/session/session.go
+++ b/common/session/session.go
@@ -78,12 +78,6 @@ type Sockopt struct {
 	Mark int32
 }
 
-// Handler is the handler setting for dispatching.
-type Handler struct {
-	// Tag of outbound handler.
-	Tag string
-}
-
 // SetAttribute attachs additional string attributes to content.
 func (c *Content) SetAttribute(name string, value string) {
 	if c.Attributes == nil {