一個TCP長鏈接設備管理後臺工程(一)
一個TCP長鏈接設備管理後臺工程(二)
一個TCP長鏈接設備管理後臺工程(三)git
Github倉庫地址github
從前面內容咱們能夠發現,808協議是一個很典型的協議格式:json
固定字段+變長字段
其中固定字段用來檢測一個幀格式的完整性和有效性,因此通常會包含一下內容:幀頭+變長字段對應的長度+校驗。因爲這一段的數據格式固定,目的單一,因此處理起來比較簡單。segmentfault
變長字段的長度是由固定字段終端某一個子字段的值決定的,並且這部分的格式比較多變,須要靈活處理。這一字段咱們一般稱爲Body或者Apdu。數組
咱們首先說明變長字段的處理流程。bash
正由於Body字段格式靈活,因此爲了提升代碼的複用性和拓展性,咱們須要對Body的處理機制進行抽象,提取出一個相對通用的接口出來。app
有經驗的工程師都知道,一個協議格式處理,無非就是編碼和解碼。編碼咱們稱之爲Marshal,解碼咱們稱之爲Unmarshal。對於不一樣的格式,咱們只須要提供不一樣的Marshal和Unmarshal實現便可。函數
從前面分析能夠知道,咱們如今面對的一種格式是相似於Plain的格式,這種格式沒有基本的分割符,下面咱們就對這種編碼來實現Marshal和Unmarshal。咱們將這部分邏輯定義爲一個codec包測試
package codec func Unmarshal(data []byte, v interface{}) (int, error){} func Marshal(v interface{}) ([]byte, error){}
參考官方庫解析json的流程,很快咱們就想到了用反射來實現這兩個功能。ui
首先咱們來分析Unmarshal,咱們須要按照v的類型,將data數據按照對應的長度和類型賦值。舉個最簡單的例子:
func TestSimple(t *testing.T) { type Body struct { Age1 int8 Age2 int16 } data := []byte{0x01, 0x02, 0x03} pack := Body{} i, err := Unmarshal(data, &pack) if err != nil { t.Errorf("err:%s", err.Error()) } t.Log("len:", i) t.Log("pack:", pack) }
$ go test -v server/codec -run TestSimple === RUN TestSimple --- PASS: TestSimple (0.00s) codec_test.go:20: len: 3 codec_test.go:21: pack: {1 515} PASS ok server/codec 0.002s
對於Body結構體,第一個字段是int8,佔用一個字節,因此分配的值是0x01。第二個字段是int16,佔用兩個字節,分配的值是0x02,0x03,而後把這兩個字節按照大端格式組合成一個int16就好了。因此結果就是Age1字段爲1(0x01),Age2字段爲515(0x0203)
因此處理的關鍵是,咱們要識別出v interface{}的類型,而後計算該類型對應的大小,再將data中對應大小的數據段組合成對應類型值複製給v中的對應字段。
v interface{}的類型多變,可能會涉及到結構體嵌套等,因此會存在遞歸處理,固然第一步咱們須要獲取到v的類型:
rv := reflect.ValueOf(v) switch rv.Kind() { case reflect.Int8: // case reflect.Uint8: // case reflect.Int16: // case reflect.Uint16: // case reflect.Int32: // case reflect.Uint32: // case reflect.Int64: // case reflect.Uint64: // case reflect.Float32: // case reflect.Float64: // case reflect.String: // case reflect.Slice: // case reflect.Struct: //須要對struct中的每一個元素進行解析 }
其餘的類型都比較好處理,須要說明的是struct類型,首先咱們要可以遍歷struct中的各個元素,因而咱們找到了:
fieldCount := v.NumField() v.Field(i)
NumField()可以獲取結構體內部元素個數,而後Field(i)經過指定index就能夠獲取到指定的元素了。獲取到了元素後,咱們就須要最這個元素進行再次的Unmarshal,也就是遞歸。可是此時咱們經過v.Field(i)獲取到的是reflect.Value類型,而不是interface{}類型了,因此遞歸的入參咱們使用reflect.Value。另外還須要考慮的一個問題是data數據的索引問題,一次調用Unmarshal就會消耗掉必定字節的data數據,消耗的長度應該可以被獲取到,以方便下一次調用Unmarshal時,可以對入參的data數據索引作正確的設定。所以,Unmarshal函數須要返回一個當前當用後所佔用的字節長度。好比int8就是一個字節,struct就是各個字段字節之和。
func Unmarshal(data []byte, v interface{}) (int,error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return 0,fmt.Errorf("error") } return refUnmarshal(data, reflect.ValueOf(v)) } func refUnmarshal(data []byte, v reflect.Value) (int,error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: usedLen = usedLen + 1 case reflect.Uint8: usedLen = usedLen + 1 case reflect.Int16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } usedLen = usedLen + 2 case reflect.Uint16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } usedLen = usedLen + 2 case reflect.Int32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } usedLen = usedLen + 4 case reflect.Uint32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } usedLen = usedLen + 4 case reflect.Int64: usedLen = usedLen + 8 case reflect.Uint64: usedLen = usedLen + 8 case reflect.Float32: usedLen = usedLen + 4 case reflect.Float64: usedLen = usedLen + 8 case reflect.String: //待處理 case reflect.Slice: //待處理 case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refUnmarshal(data[usedLen:], v.Field(i), v.Type().Field(i), streLen) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil }
解析到這個地方咱們發現,咱們又遇到了另外的一個問題:咱們沒有辦法單純的經過類型來獲取到string和struct的長度,並且咱們還必須處理這兩個類型,由於這兩個類型在協議處理中是很常見的。既然單純的經過類型沒法判斷長度,咱們就要藉助tag了。咱們嘗試着在string和slice上設定tag來解決這個問題。可是tag是屬於結構體的,只有結構體內部元素才能擁有tag,並且咱們不能經過元素自己獲取tag,必須經過上層的struct的type才能獲取到,因此此時咱們入參還要加入一個經過結構體type獲取到的對應字段reflect.StructField:
func refUnmarshal(data []byte, v reflect.Value, tag reflect.StructField) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: usedLen = usedLen + 1 case reflect.Uint8: usedLen = usedLen + 1 case reflect.Int16: usedLen = usedLen + 2 case reflect.Uint16: usedLen = usedLen + 2 case reflect.Int32: usedLen = usedLen + 4 case reflect.Uint32: usedLen = usedLen + 4 case reflect.Int64: usedLen = usedLen + 8 case reflect.Uint64: usedLen = usedLen + 8 case reflect.Float32: usedLen = usedLen + 4 case reflect.Float64: usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { // } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { // } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refUnmarshal(data[usedLen:], v.Field(i), v.Type().Field(i)) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil }
這樣咱們就能過獲取到全部的字段對應的長度了,這個很關鍵。而後咱們只須要根據對應的長度,從data中填充對應的數據值便可
func refUnmarshal(data []byte, v reflect.Value, tag reflect.StructField) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: v.SetInt(int64(data[0])) usedLen = usedLen + 1 case reflect.Uint8: v.SetUint(uint64(data[0])) usedLen = usedLen + 1 case reflect.Int16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Uint16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Int32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Uint32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Int64: v.SetInt(64) usedLen = usedLen + 8 case reflect.Uint64: v.SetUint(64) usedLen = usedLen + 8 case reflect.Float32: v.SetFloat(32.23) usedLen = usedLen + 4 case reflect.Float64: v.SetFloat(64.46) usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { // } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } if len(data) < int(lens) { return 0, fmt.Errorf("data to short") } v.SetString(string(data[:lens])) usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { // } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } v.SetBytes(data[:lens]) usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refUnmarshal(data[usedLen:], v.Field(i), v.Type().Field(i)) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil }
一個基本的Unmarshal函數就完成了。可是這個處理是比較理想的,在實際中可能會存在這樣的一種狀況:在一個協議中有若干字段,其餘的字段都是固定長度,只有一個字段是長度可變的,而這個可變長度的計算是由整體長度-固定長度來計算出來的。在這種狀況下,咱們須要提早計算出已知字段的固定長度,而後用data長度-固定長度,獲得惟一的可變字段的長度。因此我如今要有一個獲取這個結構的有效長度的函數。前面的Unmarshal內部已經能夠獲取到每一個字段的長度了,咱們只須要把這個函數簡單改造一下就好了:
func RequireLen(v interface{}) (int, error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return 0, fmt.Errorf("error") } return refRequireLen(reflect.ValueOf(v), reflect.StructField{}) } func refRequireLen(v reflect.Value, tag reflect.StructField) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: usedLen = usedLen + 1 case reflect.Uint8: usedLen = usedLen + 1 case reflect.Int16: usedLen = usedLen + 2 case reflect.Uint16: usedLen = usedLen + 2 case reflect.Int32: usedLen = usedLen + 4 case reflect.Uint32: usedLen = usedLen + 4 case reflect.Int64: usedLen = usedLen + 8 case reflect.Uint64: usedLen = usedLen + 8 case reflect.Float32: usedLen = usedLen + 4 case reflect.Float64: usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") if strLen == "" { return 0, nil } lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") if strLen == "" { return 0, nil } lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refRequireLen(v.Field(i), v.Type().Field(i)) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil }
這樣咱們就能夠實現一個完整的Unmarshal
func Unmarshal(data []byte, v interface{}) (int, error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return 0, fmt.Errorf("error") } lens, err := RequireLen(v) if err != nil { return 0, err } if len(data) < lens { return 0, fmt.Errorf("data too short") } return refUnmarshal(data, reflect.ValueOf(v), reflect.StructField{}, len(data)-lens) } func refUnmarshal(data []byte, v reflect.Value, tag reflect.StructField, streLen int) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: v.SetInt(int64(data[0])) usedLen = usedLen + 1 case reflect.Uint8: v.SetUint(uint64(data[0])) usedLen = usedLen + 1 case reflect.Int16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Uint16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Int32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Uint32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Int64: v.SetInt(64) usedLen = usedLen + 8 case reflect.Uint64: v.SetUint(64) usedLen = usedLen + 8 case reflect.Float32: v.SetFloat(32.23) usedLen = usedLen + 4 case reflect.Float64: v.SetFloat(64.46) usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { lens = streLen } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } if len(data) < int(lens) { return 0, fmt.Errorf("data to short") } v.SetString(string(data[:lens])) usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { lens = streLen } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } v.SetBytes(data[:lens]) usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refUnmarshal(data[usedLen:], v.Field(i), v.Type().Field(i), streLen) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil }
理解了上面的流程,Marshal就就很好寫了,只是複製過程反過來就好了。這其中還有一些小的轉換邏輯將字節數組轉換成多字節整形:Bytes2Word、Word2Bytes、Bytes2DWord、Dword2Bytes。這類轉換都使用大端格式處理。完整代碼以下:
package codec import ( "fmt" "reflect" "strconv" ) func RequireLen(v interface{}) (int, error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return 0, fmt.Errorf("error") } return refRequireLen(reflect.ValueOf(v), reflect.StructField{}) } func Unmarshal(data []byte, v interface{}) (int, error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return 0, fmt.Errorf("error") } lens, err := RequireLen(v) if err != nil { return 0, err } if len(data) < lens { return 0, fmt.Errorf("data too short") } return refUnmarshal(data, reflect.ValueOf(v), reflect.StructField{}, len(data)-lens) } func Marshal(v interface{}) ([]byte, error) { rv := reflect.ValueOf(v) if rv.Kind() != reflect.Ptr || rv.IsNil() { return []byte{}, fmt.Errorf("error") } return refMarshal(reflect.ValueOf(v), reflect.StructField{}) } func refRequireLen(v reflect.Value, tag reflect.StructField) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: usedLen = usedLen + 1 case reflect.Uint8: usedLen = usedLen + 1 case reflect.Int16: usedLen = usedLen + 2 case reflect.Uint16: usedLen = usedLen + 2 case reflect.Int32: usedLen = usedLen + 4 case reflect.Uint32: usedLen = usedLen + 4 case reflect.Int64: usedLen = usedLen + 8 case reflect.Uint64: usedLen = usedLen + 8 case reflect.Float32: usedLen = usedLen + 4 case reflect.Float64: usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") if strLen == "" { return 0, nil } lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") if strLen == "" { return 0, nil } lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refRequireLen(v.Field(i), v.Type().Field(i)) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil } func refUnmarshal(data []byte, v reflect.Value, tag reflect.StructField, streLen int) (int, error) { var usedLen int = 0 if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: v.SetInt(int64(data[0])) usedLen = usedLen + 1 case reflect.Uint8: v.SetUint(uint64(data[0])) usedLen = usedLen + 1 case reflect.Int16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Uint16: if len(data) < 2 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2Word(data))) usedLen = usedLen + 2 case reflect.Int32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetInt(int64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Uint32: if len(data) < 4 { return 0, fmt.Errorf("data to short") } v.SetUint(uint64(Bytes2DWord(data))) usedLen = usedLen + 4 case reflect.Int64: v.SetInt(64) usedLen = usedLen + 8 case reflect.Uint64: v.SetUint(64) usedLen = usedLen + 8 case reflect.Float32: v.SetFloat(32.23) usedLen = usedLen + 4 case reflect.Float64: v.SetFloat(64.46) usedLen = usedLen + 8 case reflect.String: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { lens = streLen } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } if len(data) < int(lens) { return 0, fmt.Errorf("data to short") } v.SetString(string(data[:lens])) usedLen = usedLen + int(lens) case reflect.Slice: strLen := tag.Tag.Get("len") var lens int = 0 if strLen == "" { lens = streLen } else { lens64, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return 0, err } lens = int(lens64) } v.SetBytes(data[:lens]) usedLen = usedLen + int(lens) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { l, err := refUnmarshal(data[usedLen:], v.Field(i), v.Type().Field(i), streLen) if err != nil { return 0, err } usedLen = usedLen + l } } return usedLen, nil } func refMarshal(v reflect.Value, tag reflect.StructField) ([]byte, error) { data := make([]byte, 0) if v.Kind() == reflect.Ptr { v = v.Elem() } switch v.Kind() { case reflect.Int8: data = append(data, byte(v.Int())) case reflect.Uint8: data = append(data, byte(v.Uint())) case reflect.Int16: temp := Word2Bytes(uint16(v.Int())) data = append(data, temp...) case reflect.Uint16: temp := Word2Bytes(uint16(v.Uint())) data = append(data, temp...) case reflect.Int32: temp := Dword2Bytes(uint32(v.Int())) data = append(data, temp...) case reflect.Uint32: temp := Dword2Bytes(uint32(v.Uint())) data = append(data, temp...) case reflect.String: strLen := tag.Tag.Get("len") lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return []byte{}, err } if int(lens) > v.Len() { zeroSlice := make([]byte, int(lens)-v.Len()) data = append(data, zeroSlice...) } data = append(data, v.String()...) case reflect.Slice: strLen := tag.Tag.Get("len") lens, err := strconv.ParseInt(strLen, 10, 0) if err != nil { return []byte{}, err } if int(lens) > v.Len() { zeroSlice := make([]byte, int(lens)-v.Len()) data = append(data, zeroSlice...) } data = append(data, v.Bytes()...) case reflect.Struct: fieldCount := v.NumField() for i := 0; i < fieldCount; i++ { d, err := refMarshal(v.Field(i), v.Type().Field(i)) if err != nil { return []byte{}, err } data = append(data, d...) } } return data, nil } func Bytes2Word(data []byte) uint16 { if len(data) < 2 { return 0 } return (uint16(data[0]) << 8) + uint16(data[1]) } func Word2Bytes(data uint16) []byte { buff := make([]byte, 2) buff[0] = byte(data >> 8) buff[1] = byte(data) return buff } func Bytes2DWord(data []byte) uint32 { if len(data) < 4 { return 0 } return (uint32(data[0]) << 24) + (uint32(data[1]) << 16) + (uint32(data[2]) << 8) + uint32(data[3]) } func Dword2Bytes(data uint32) []byte { buff := make([]byte, 4) buff[0] = byte(data >> 24) buff[1] = byte(data >> 16) buff[2] = byte(data >> 8) buff[3] = byte(data) return buff }
測試程序codec_test.go
package codec import ( "testing" ) func TestUnmarshal(t *testing.T) { type Data struct { Size int8 Size2 uint16 Size3 uint32 Name string `len:"5"` Message string Sec []byte `len:"3"` } type Body struct { Age1 int8 Age2 int16 Length int32 Data1 Data } data := []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0x31, 0x32, 0x33, 0x34, 0x35, 0x31, 0x30, 0x03, 0x02, 0x01} pack := Body{} i, err := Unmarshal(data, &pack) if err != nil { t.Errorf("err:%s", err.Error()) } t.Log("len:", i) t.Log("pack:", pack) } func TestMarshal(t *testing.T) { type Data struct { Size int8 Size2 uint16 Size3 uint32 Name string `len:"5"` Message string Sec []byte `len:"3"` } type Body struct { Age1 int8 Age2 int16 Length int32 Data1 Data } pack := Body{ Age1: 13, Age2: 1201, Length: 81321, Data1: Data{ Size: 110, Size2: 39210, Size3: 85632, Name: "ASDFG", Message: "ZXCVBN", Sec: []byte{0x01, 0x02, 0x03}, }, } data, err := Marshal(&pack) if err != nil { t.Errorf("err:%s", err.Error()) } t.Log("data:", data) t.Log("pack:", pack) }
測試結果:
$ go test -v server/codec -run TestMarshal === RUN TestMarshal --- PASS: TestMarshal (0.00s) codec_test.go:70: data: [13 4 177 0 1 61 169 110 153 42 0 1 78 128 65 83 68 70 71 90 88 67 86 66 78 1 2 3] codec_test.go:71: pack: {13 1201 81321 {110 39210 85632 ASDFG ZXCVBN [1 2 3]}} PASS ok server/codec 0.001s # xml @ xia in ~/work/code/code_go/cmdtest [10:21:47] $ go test -v server/codec -run TestUnmarshal === RUN TestUnmarshal --- PASS: TestUnmarshal (0.00s) codec_test.go:31: len: 24 codec_test.go:32: pack: {1 515 67438087 {-95 41635 2762319527 12345 10 [3 2 1]}} PASS ok server/codec 0.002s