Add sub-command "-dump" to "run". (#2854)

* Add MarshalToJson().

* Add cmd arg -dump for printing out merged multiple json configs.

---------

Co-authored-by: nobody <nobody@nowhere.mars>

common/log/logger.go

@@ -27,6 +27,11 @@ type generalLogger struct {
 	done    *done.Instance
 }
 
+type serverityLogger struct {
+	inner    *generalLogger
+	logLevel Severity
+}
+
 // NewLogger returns a generic log handler that can handle all type of messages.
 func NewLogger(logWriterCreator WriterCreator) Handler {
 	return &generalLogger{
@@ -37,6 +42,32 @@ func NewLogger(logWriterCreator WriterCreator) Handler {
 	}
 }
 
+func ReplaceWithSeverityLogger(serverity Severity) {
+	w := CreateStdoutLogWriter()
+	g := &generalLogger{
+		creator: w,
+		buffer:  make(chan Message, 16),
+		access:  semaphore.New(1),
+		done:    done.New(),
+	}
+	s := &serverityLogger{
+		inner:    g,
+		logLevel: serverity,
+	}
+	RegisterHandler(s)
+}
+
+func (l *serverityLogger) Handle(msg Message) {
+	switch msg := msg.(type) {
+	case *GeneralMessage:
+		if msg.Severity <= l.logLevel {
+			l.inner.Handle(msg)
+		}
+	default:
+		l.inner.Handle(msg)
+	}
+}
+
 func (l *generalLogger) run() {
 	defer l.access.Signal()
 
@@ -67,6 +98,7 @@ func (l *generalLogger) run() {
 }
 
 func (l *generalLogger) Handle(msg Message) {
+
 	select {
 	case l.buffer <- msg:
 	default:

common/reflect/marshal.go

@@ -0,0 +1,173 @@
+package reflect
+
+import (
+	"encoding/json"
+	"reflect"
+	"slices"
+
+	cserial "github.com/xtls/xray-core/common/serial"
+)
+
+func MarshalToJson(v interface{}) (string, bool) {
+	if itf := marshalInterface(v, true); itf != nil {
+		if b, err := json.MarshalIndent(itf, "", "  "); err == nil {
+			return string(b[:]), true
+		}
+	}
+	return "", false
+}
+
+func marshalTypedMessage(v *cserial.TypedMessage, ignoreNullValue bool) interface{} {
+	tmsg, err := v.GetInstance()
+	if err != nil {
+		return nil
+	}
+	r := marshalInterface(tmsg, ignoreNullValue)
+	if msg, ok := r.(map[string]interface{}); ok {
+		msg["_TypedMessage_"] = v.Type
+	}
+	return r
+}
+
+func marshalSlice(v reflect.Value, ignoreNullValue bool) interface{} {
+	r := make([]interface{}, 0)
+	for i := 0; i < v.Len(); i++ {
+		rv := v.Index(i)
+		if rv.CanInterface() {
+			value := rv.Interface()
+			r = append(r, marshalInterface(value, ignoreNullValue))
+		}
+	}
+	return r
+}
+
+func marshalStruct(v reflect.Value, ignoreNullValue bool) interface{} {
+	r := make(map[string]interface{})
+	t := v.Type()
+	for i := 0; i < v.NumField(); i++ {
+		rv := v.Field(i)
+		if rv.CanInterface() {
+			ft := t.Field(i)
+			name := ft.Name
+			value := rv.Interface()
+			tv := marshalInterface(value, ignoreNullValue)
+			if tv != nil || !ignoreNullValue {
+				r[name] = tv
+			}
+		}
+	}
+	return r
+}
+
+func marshalMap(v reflect.Value, ignoreNullValue bool) interface{} {
+	// policy.level is map[uint32] *struct
+	kt := v.Type().Key()
+	vt := reflect.TypeOf((*interface{})(nil))
+	mt := reflect.MapOf(kt, vt)
+	r := reflect.MakeMap(mt)
+	for _, key := range v.MapKeys() {
+		rv := v.MapIndex(key)
+		if rv.CanInterface() {
+			iv := rv.Interface()
+			tv := marshalInterface(iv, ignoreNullValue)
+			if tv != nil || !ignoreNullValue {
+				r.SetMapIndex(key, reflect.ValueOf(&tv))
+			}
+		}
+	}
+	return r.Interface()
+}
+
+func marshalIString(v interface{}) (r string, ok bool) {
+	defer func() {
+		if err := recover(); err != nil {
+			r = ""
+			ok = false
+		}
+	}()
+
+	if iStringFn, ok := v.(interface{ String() string }); ok {
+		return iStringFn.String(), true
+	}
+	return "", false
+}
+
+func marshalKnownType(v interface{}, ignoreNullValue bool) (interface{}, bool) {
+	switch ty := v.(type) {
+	case cserial.TypedMessage:
+		return marshalTypedMessage(&ty, ignoreNullValue), true
+	case *cserial.TypedMessage:
+		return marshalTypedMessage(ty, ignoreNullValue), true
+	case map[string]json.RawMessage:
+		return ty, true
+	case []json.RawMessage:
+		return ty, true
+	case *json.RawMessage:
+		return ty, true
+	case json.RawMessage:
+		return ty, true
+	default:
+		return nil, false
+	}
+}
+
+var valueKinds = []reflect.Kind{
+	reflect.Bool,
+	reflect.Int,
+	reflect.Int8,
+	reflect.Int16,
+	reflect.Int32,
+	reflect.Int64,
+	reflect.Uint,
+	reflect.Uint8,
+	reflect.Uint16,
+	reflect.Uint32,
+	reflect.Uint64,
+	reflect.Uintptr,
+	reflect.Float32,
+	reflect.Float64,
+	reflect.Complex64,
+	reflect.Complex128,
+	reflect.String,
+}
+
+func isValueKind(kind reflect.Kind) bool {
+	return slices.Contains(valueKinds, kind)
+}
+
+func marshalInterface(v interface{}, ignoreNullValue bool) interface{} {
+
+	if r, ok := marshalKnownType(v, ignoreNullValue); ok {
+		return r
+	}
+
+	rv := reflect.ValueOf(v)
+	if rv.Kind() == reflect.Ptr {
+		rv = rv.Elem()
+	}
+	k := rv.Kind()
+	if k == reflect.Invalid {
+		return nil
+	}
+	if isValueKind(k) {
+		return v
+	}
+
+	switch k {
+	case reflect.Struct:
+		return marshalStruct(rv, ignoreNullValue)
+	case reflect.Slice:
+		return marshalSlice(rv, ignoreNullValue)
+	case reflect.Array:
+		return marshalSlice(rv, ignoreNullValue)
+	case reflect.Map:
+		return marshalMap(rv, ignoreNullValue)
+	default:
+		break
+	}
+
+	if str, ok := marshalIString(v); ok {
+		return str
+	}
+	return nil
+}

common/reflect/marshal_test.go

@@ -0,0 +1,187 @@
+package reflect_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+	"testing"
+
+	. "github.com/xtls/xray-core/common/reflect"
+	cserial "github.com/xtls/xray-core/common/serial"
+	iserial "github.com/xtls/xray-core/infra/conf/serial"
+)
+
+func TestMashalStruct(t *testing.T) {
+	type Foo = struct {
+		N   int                             `json:"n"`
+		Np  *int                            `json:"np"`
+		S   string                          `json:"s"`
+		Arr *[]map[string]map[string]string `json:"arr"`
+	}
+
+	n := 1
+	np := &n
+	arr := make([]map[string]map[string]string, 0)
+	m1 := make(map[string]map[string]string, 0)
+	m2 := make(map[string]string, 0)
+	m2["hello"] = "world"
+	m1["foo"] = m2
+
+	arr = append(arr, m1)
+
+	f1 := Foo{
+		N:   n,
+		Np:  np,
+		S:   "hello",
+		Arr: &arr,
+	}
+
+	s, ok1 := MarshalToJson(f1)
+	sp, ok2 := MarshalToJson(&f1)
+
+	if !ok1 || !ok2 || s != sp {
+		t.Error("marshal failed")
+	}
+
+	f2 := Foo{}
+	if json.Unmarshal([]byte(s), &f2) != nil {
+		t.Error("json unmarshal failed")
+	}
+
+	v := (*f2.Arr)[0]["foo"]["hello"]
+
+	if f1.N != f2.N || *(f1.Np) != *(f2.Np) || f1.S != f2.S || v != "world" {
+		t.Error("f1 not equal to f2")
+	}
+}
+
+func TestMarshalConfigJson(t *testing.T) {
+
+	buf := bytes.NewBufferString(getConfig())
+	config, err := iserial.DecodeJSONConfig(buf)
+	if err != nil {
+		t.Error("decode JSON config failed")
+	}
+
+	bc, err := config.Build()
+	if err != nil {
+		t.Error("build core config failed")
+	}
+
+	tmsg := cserial.ToTypedMessage(bc)
+	tc, ok := MarshalToJson(tmsg)
+	if !ok {
+		t.Error("marshal config failed")
+	}
+
+	// t.Log(tc)
+
+	keywords := []string{
+		"4784f9b8-a879-4fec-9718-ebddefa47750",
+		"bing.com",
+		"DomainStrategy",
+		"InboundTag",
+		"Level",
+		"Stats",
+		"UserDownlink",
+		"UserUplink",
+		"System",
+		"InboundDownlink",
+		"OutboundUplink",
+	}
+	for _, kw := range keywords {
+		if !strings.Contains(tc, kw) {
+			t.Error("marshaled config error")
+		}
+	}
+}
+
+func getConfig() string {
+	return `{
+		"log": {
+		  "loglevel": "debug"
+		},
+		"stats": {},
+		"policy": {
+		  "levels": {
+			"0": {
+			  "statsUserUplink": true,
+			  "statsUserDownlink": true
+			}
+		  },
+		  "system": {
+			"statsInboundUplink": true,
+			"statsInboundDownlink": true,
+			"statsOutboundUplink": true,
+			"statsOutboundDownlink": true
+		  }
+		},
+		"inbounds": [
+		  {
+			"tag": "agentin",
+			"protocol": "http",
+			"port": 8080,
+			"listen": "127.0.0.1",
+			"settings": {}
+		  },
+		  {
+			"listen": "127.0.0.1",
+			"port": 10085,
+			"protocol": "dokodemo-door",
+			"settings": {
+			  "address": "127.0.0.1"
+			},
+			"tag": "api-in"
+		  }
+		],
+		"api": {
+		  "tag": "api",
+		  "services": [
+			"HandlerService",
+			"StatsService"
+		  ]
+		},
+		"routing": {
+		  "rules": [
+			{
+			  "inboundTag": [
+				"api-in"
+			  ],
+			  "outboundTag": "api",
+			  "type": "field"
+			}
+		  ],
+		  "domainStrategy": "AsIs"
+		},
+		"outbounds": [
+		  {
+			"protocol": "vless",
+			"settings": {
+			  "vnext": [
+				{
+				  "address": "1.2.3.4",
+				  "port": 1234,
+				  "users": [
+					{
+					  "id": "4784f9b8-a879-4fec-9718-ebddefa47750",
+					  "encryption": "none"
+					}
+				  ]
+				}
+			  ]
+			},
+			"tag": "agentout",
+			"streamSettings": {
+			  "network": "ws",
+			  "security": "none",
+			  "wsSettings": {
+				"path": "/?ed=2048",
+				"headers": {
+				  "Host": "bing.com"
+				}
+			  }
+			}
+		  }
+		]
+	  }`
+}

core/config.go

@@ -2,6 +2,7 @@ package core
 
 import (
 	"io"
+	"slices"
 	"strings"
 
 	"github.com/xtls/xray-core/common"
@@ -24,10 +25,14 @@ type ConfigLoader func(input interface{}) (*Config, error)
 // ConfigBuilder is a builder to build core.Config from filenames and formats
 type ConfigBuilder func(files []string, formats []string) (*Config, error)
 
+// ConfigMerger merge multiple json configs into on config
+type ConfigsMerger func(files []string, formats []string) (string, error)
+
 var (
 	configLoaderByName    = make(map[string]*ConfigFormat)
 	configLoaderByExt     = make(map[string]*ConfigFormat)
 	ConfigBuilderForFiles ConfigBuilder
+	ConfigMergedFormFiles ConfigsMerger
 )
 
 // RegisterConfigLoader add a new ConfigLoader.
@@ -49,6 +54,20 @@ func RegisterConfigLoader(format *ConfigFormat) error {
 	return nil
 }
 
+func GetMergedConfig(args cmdarg.Arg) (string, error) {
+	files := make([]string, 0)
+	formats := make([]string, 0)
+	supported := []string{"json", "yaml", "toml"}
+	for _, file := range args {
+		format := getFormat(file)
+		if slices.Contains(supported, format) {
+			files = append(files, file)
+			formats = append(formats, format)
+		}
+	}
+	return ConfigMergedFormFiles(files, formats)
+}
+
 func GetFormatByExtension(ext string) string {
 	switch strings.ToLower(ext) {
 	case "pb", "protobuf":

infra/conf/serial/builder.go

@@ -3,12 +3,25 @@ package serial
 import (
 	"io"
 
+	creflect "github.com/xtls/xray-core/common/reflect"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/infra/conf"
 	"github.com/xtls/xray-core/main/confloader"
 )
 
-func BuildConfig(files []string, formats []string) (*core.Config, error) {
+func MergeConfigFromFiles(files []string, formats []string) (string, error) {
+	c, err := mergeConfigs(files, formats)
+	if err != nil {
+		return "", err
+	}
+
+	if j, ok := creflect.MarshalToJson(c); ok {
+		return j, nil
+	}
+	return "", newError("marshal to json failed.").AtError()
+}
+
+func mergeConfigs(files []string, formats []string) (*conf.Config, error) {
 	cf := &conf.Config{}
 	for i, file := range files {
 		newError("Reading config: ", file).AtInfo().WriteToLog()
@@ -26,7 +39,15 @@ func BuildConfig(files []string, formats []string) (*core.Config, error) {
 		}
 		cf.Override(c, file)
 	}
-	return cf.Build()
+	return cf, nil
+}
+
+func BuildConfig(files []string, formats []string) (*core.Config, error) {
+	config, err := mergeConfigs(files, formats)
+	if err != nil {
+		return nil, err
+	}
+	return config.Build()
 }
 
 type readerDecoder func(io.Reader) (*conf.Config, error)
@@ -39,4 +60,5 @@ func init() {
 	ReaderDecoderByFormat["toml"] = DecodeTOMLConfig
 
 	core.ConfigBuilderForFiles = BuildConfig
+	core.ConfigMergedFormFiles = MergeConfigFromFiles
 }

main/run.go

@@ -12,8 +12,10 @@ import (
 	"runtime/debug"
 	"strings"
 	"syscall"
+	"time"
 
 	"github.com/xtls/xray-core/common/cmdarg"
+	clog "github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/main/commands/base"
@@ -34,7 +36,9 @@ The -format=json flag sets the format of config files.
 Default "auto".
 
 The -test flag tells Xray to test config files only, 
-without launching the server
+without launching the server.
+
+The -dump flag tells Xray to print the merged config.
 	`,
 }
 
@@ -45,6 +49,7 @@ func init() {
 var (
 	configFiles cmdarg.Arg // "Config file for Xray.", the option is customed type, parse in main
 	configDir   string
+	dump        = cmdRun.Flag.Bool("dump", false, "Dump merged config only, without launching Xray server.")
 	test        = cmdRun.Flag.Bool("test", false, "Test config file only, without launching Xray server.")
 	format      = cmdRun.Flag.String("format", "auto", "Format of input file.")
 
@@ -61,6 +66,12 @@ var (
 )
 
 func executeRun(cmd *base.Command, args []string) {
+	if *dump {
+		clog.ReplaceWithSeverityLogger(clog.Severity_Warning)
+		errCode := dumpConfig()
+		os.Exit(errCode)
+	}
+
 	printVersion()
 	server, err := startXray()
 	if err != nil {
@@ -97,6 +108,18 @@ func executeRun(cmd *base.Command, args []string) {
 	}
 }
 
+func dumpConfig() int {
+	files := getConfigFilePath(false)
+	if config, err := core.GetMergedConfig(files); err != nil {
+		fmt.Println(err)
+		time.Sleep(1 * time.Second)
+		return 23
+	} else {
+		fmt.Print(config)
+	}
+	return 0
+}
+
 func fileExists(file string) bool {
 	info, err := os.Stat(file)
 	return err == nil && !info.IsDir()
@@ -139,12 +162,16 @@ func readConfDir(dirPath string) {
 	}
 }
 
-func getConfigFilePath() cmdarg.Arg {
+func getConfigFilePath(verbose bool) cmdarg.Arg {
 	if dirExists(configDir) {
+		if verbose {
 			log.Println("Using confdir from arg:", configDir)
+		}
 		readConfDir(configDir)
 	} else if envConfDir := platform.GetConfDirPath(); dirExists(envConfDir) {
+		if verbose {
 			log.Println("Using confdir from env:", envConfDir)
+		}
 		readConfDir(envConfDir)
 	}
 
@@ -155,17 +182,23 @@ func getConfigFilePath() cmdarg.Arg {
 	if workingDir, err := os.Getwd(); err == nil {
 		configFile := filepath.Join(workingDir, "config.json")
 		if fileExists(configFile) {
+			if verbose {
 				log.Println("Using default config: ", configFile)
+			}
 			return cmdarg.Arg{configFile}
 		}
 	}
 
 	if configFile := platform.GetConfigurationPath(); fileExists(configFile) {
+		if verbose {
 			log.Println("Using config from env: ", configFile)
+		}
 		return cmdarg.Arg{configFile}
 	}
 
+	if verbose {
 		log.Println("Using config from STDIN")
+	}
 	return cmdarg.Arg{"stdin:"}
 }
 
@@ -178,7 +211,7 @@ func getConfigFormat() string {
 }
 
 func startXray() (core.Server, error) {
-	configFiles := getConfigFilePath()
+	configFiles := getConfigFilePath(true)
 
 	// config, err := core.LoadConfig(getConfigFormat(), configFiles[0], configFiles)