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message.go
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package go8583
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"sort"
"strconv"
"sync"
"github.com/doswell/go8583/util"
)
type MessageTemplate interface {
GetFieldDef(fieldNumber int) (field Field, err error)
}
type Message interface {
SetField(fieldNr int, value FieldValue)
SetString(fieldNr int, value string)
GetField(fieldNr int) (string, bool)
GetMsgType() int
Pack() ([]byte, error)
SetMsgType(msgType int)
CopyField(fieldNr int, msg Message)
GetSubField(fieldNr int, subFieldNr int) (string, bool)
SetSubField(fieldNr, subFieldNr int, subValue string)
GetMsgTypeString() string
}
type BitmapMessageTemplate struct {
Header []Field
Fields map[int]Field
lock sync.Mutex
}
type BitmapMessage struct {
*BitmapMessageTemplate
MessageType int
FieldValues map[int]FieldValue
}
func (m *BitmapMessage) Init() {
m.FieldValues = make(map[int]FieldValue)
}
type Unpacker interface {
Unpack(offset int, data []byte) (newOffset int, fieldData []byte, err error)
}
type Packer interface {
Pack(data []byte) (msg []byte, err error)
}
type PackerUnpacker interface {
Unpacker
Packer
}
type FieldUnpacker interface {
UnpackField(offset int, data []byte) (newOffset int, fieldValue FieldValue, err error)
}
type FieldPacker interface {
PackField(fieldValue FieldValue) (msg []byte, err error)
}
type FieldPackerUnpacker interface {
FieldUnpacker
FieldPacker
}
type fieldType int
const (
AlphaNumeric fieldType = iota
Numeric
AlphaNumericSpecial
Alpha
Binary
)
var fieldTypeLookup = map[fieldType]string{
AlphaNumeric: "an",
Numeric: "n",
AlphaNumericSpecial: "ans",
Alpha: "a",
Binary: "b",
}
type Field interface {
GetFieldNumber() int
GetName() string
GetType() fieldType
GetLength() variableFieldLength
GetSize() int
FieldPackerUnpacker
}
type SubField interface {
GetSubField(field int) (value string, err error)
}
type BitmapMessageField struct {
FieldNumber int
Name string
Type fieldType
Length variableFieldLength //Type of field length
Size int //Maximum size of field
PackerUnpacker
FieldPackerUnpacker
}
type FieldValue struct {
// Field
Value string
FieldValues map[int]FieldValue
fmt.Stringer
}
func (f *FieldValue) String() string {
return f.Value
}
func (f *BitmapMessageField) GetFieldNumber() int {
return f.FieldNumber
}
func (f *BitmapMessageField) GetName() string {
return f.Name
}
func (f *BitmapMessageField) GetType() fieldType {
return f.Type
}
func (f *BitmapMessageField) GetLength() variableFieldLength {
return f.Length
}
func (f *BitmapMessageField) GetSize() int {
return f.Size
}
func (f *BitmapMessageField) ValidateValue(value string) (valid bool, err error) {
return true, nil
}
func (f *BitmapMessageField) UnpackField(offset int, data []byte) (newOffset int, value FieldValue, err error) {
newOffset, fieldData, err := f.Unpack(offset, data)
value = FieldValue{Value: string(fieldData)}
return newOffset, value, nil
//return offset, "", errors.New("Undefined unpacking")
}
func (f *BitmapMessageField) PackField(value FieldValue) (data []byte, err error) {
var fieldData []byte
if f.GetLength() == Fixed {
fieldData, err = f.Pack([]byte(util.LeftPad2Len(value.Value, " ", f.GetSize())))
} else {
fieldData, err = f.Pack([]byte(value.Value))
}
return fieldData, err
}
func (f *BitmapMessageTemplate) GetFieldDef(fieldNumber int) (field Field, err error) {
field, exists := f.Fields[fieldNumber]
if !exists {
return nil, errors.New("Field not found")
}
return field, nil
}
func (m *BitmapMessage) SetString(fieldNr int, value string) {
m.SetField(fieldNr, FieldValue{Value: value})
}
func (m *BitmapMessage) SetField(fieldNr int, value FieldValue) {
if fieldNr > 64 && !m.IsFieldSet(1) {
m.SetField(1, *new(FieldValue))
}
m.FieldValues[fieldNr] = value
//TODO: Validate field?
}
func (m *BitmapMessage) SetSubField(fieldNr int, subFieldNr int, value string) {
if _, ok := m.FieldValues[fieldNr]; !ok {
m.SetField(fieldNr, FieldValue{FieldValues: make(map[int]FieldValue)})
}
m.FieldValues[fieldNr].FieldValues[subFieldNr] = FieldValue{Value: value}
}
func (m *BitmapMessage) GetSubField(fieldNr, subFieldNr int) (value string, isSet bool) {
if _, ok := m.FieldValues[fieldNr]; !ok {
return value, ok //Not found
}
if m.FieldValues[fieldNr].FieldValues == nil {
//not a set subfield.
return value, false
}
if fvalue, ok := m.FieldValues[fieldNr].FieldValues[subFieldNr]; !ok {
return value, ok
} else {
return fvalue.Value, ok
}
}
func (m *BitmapMessage) IsFieldSet(fieldNr int) bool {
_, set := m.FieldValues[fieldNr]
return set
}
func (m *BitmapMessage) GetField(fieldNr int) (value string, isSet bool) {
fieldValue, set := m.FieldValues[fieldNr]
return fieldValue.Value, set
}
func (m *BitmapMessage) GetString(fieldNr int) (value string, isSet bool) {
return m.GetField(fieldNr)
}
func (m *BitmapMessage) CopyField(fieldNr int, msg Message) {
v, set := msg.GetField(fieldNr)
if set {
m.SetString(fieldNr, v)
}
}
func (m *BitmapMessage) GetMsgType() int {
return m.MessageType
}
func (m *BitmapMessage) GetMsgTypeString() string {
return util.LeftPad2Len(strconv.FormatInt(int64(m.GetMsgType()), 16), "0", 4)
}
func (m *BitmapMessage) Pack() ([]byte, error) {
buf := new(bytes.Buffer)
buf.WriteString(m.GetMsgTypeString())
//Generate the bitmap based on set fields.
bytes, err := PackBitmapFields(m.FieldValues, m.BitmapMessageTemplate)
if err != nil {
return nil, err
}
buf.Write(bytes)
return buf.Bytes(), nil
}
func PackBitmapFields(fieldValues map[int]FieldValue, tmpl *BitmapMessageTemplate) (data []byte, err error) {
buf := new(bytes.Buffer)
bufFields := new(bytes.Buffer)
var setFields []int
for m := range fieldValues {
setFields = append(setFields, m)
}
sort.Ints(setFields)
var bitmapSize int = 1
if _, ok := fieldValues[1]; ok {
bitmapSize = 2
}
bitMap := make([]uint64, bitmapSize)
for _, i := range setFields {
ui := uint64(i)
//bitMap[i/64] |= 1 << (64 - (ui - (ui/64)*64))
//bitMap[i/64] |= 1 << (64 - ui%64)
bitMap[i/64] |= 1 << (ui%64 - 1) //We set each bit accordingly, then reverse the whole map when packing
if i > 1 {
f, ok := tmpl.Fields[i]
if !ok {
fmt.Println("Template missing: ", i)
}
fieldBytes, err := f.PackField(fieldValues[i])
if err != nil {
fmt.Println("error packing field ", i, " ", err)
continue
}
binary.Write(bufFields, binary.LittleEndian, fieldBytes)
}
}
for _, b := range bitMap {
binary.Write(buf, binary.BigEndian, util.ReverseUint64Bits(b))
}
//Write fields
bufFields.WriteTo(buf)
return buf.Bytes(), nil
}
func (m *BitmapMessage) SetMsgType(msgType int) {
m.MessageType = msgType
}
//func (f *BitmapMessageField) Unpacker(offset int, data []byte) (newOffset int, fieldValue string, err error) {
// return 0, "", errors.New("Error")
//}
func CreateFields(fields ...Field) map[int]Field {
fieldMap := make(map[int]Field)
for _, f := range fields {
fieldMap[f.GetFieldNumber()] = f
}
return fieldMap
}
func BitmapUnpack(data []byte, tmpl MessageTemplate, msg Message) (err error) {
defer func() {
if r := recover(); r != nil {
err = r.(error)
}
}()
if msg == nil {
return errors.New("Message must not be nil")
}
if len(data) < 12 {
return errors.New("Invalid message size. Must be at least 12 bytes")
}
//First 4 bytes are the message type header.
msgTypeStr := string(data[0:4])
msgType, err := strconv.ParseInt(msgTypeStr, 16, 0)
if err != nil {
return errors.New(fmt.Sprint("Message type not numeric; ", err))
}
msg.SetMsgType(int(msgType))
i := 4
bitmap := data[i : i+8]
i = i + 8
if bitmap[0]&0x80 > 0 { //Extended bitmap.
bitmap = append(bitmap, data[i:i+8]...)
i = i + 8
}
boolBitmap := util.GetBitmap(bitmap)
for fieldNr, b := range boolBitmap {
fieldNr = fieldNr + 1
if fieldNr == 1 {
continue
}
if b {
field, err := tmpl.GetFieldDef(fieldNr)
if err != nil {
fmt.Println("Error unpacking field ", fieldNr, " : ", err)
return err
}
var fieldValue FieldValue
i, fieldValue, err = field.UnpackField(i, data)
if err != nil {
fmt.Println("Error unpacking field ", fieldNr, " : ", err)
return err
}
msg.SetField(fieldNr, fieldValue)
}
}
return nil
}
func (m *BitmapMessage) String() string {
buf := bytes.NewBufferString("")
buf.WriteString(util.LeftPad2Len(strconv.FormatInt(int64(m.GetMsgType()), 16), "0", 4))
buf.WriteString(":\n")
/*
[LLVAR n ..19 016] 002 [4300000000008267]
[Fixed n 6 006] 003 [350000]
[None n 012] 004 [000000004000]
[Fixed n 10 010] 007 [0602195310]
[Fixed n 6 006] 011 [001594]
*/
formatFieldsToString(buf, m.BitmapMessageTemplate, m.FieldValues, "")
return buf.String()
}
func formatFieldsToString(buf *bytes.Buffer, tmpl MessageTemplate, values map[int]FieldValue, fieldPrefix string) {
var setFields []int
for m := range values {
setFields = append(setFields, m)
}
sort.Ints(setFields)
for _, i := range setFields {
if i > 1 {
f, err := tmpl.GetFieldDef(i)
if err != nil {
fmt.Println("Template missing: ", i)
}
fieldValue := values[i]
if fieldValue.FieldValues != nil {
mt, ok := f.(MessageTemplate)
if ok {
formatFieldsToString(buf, mt, fieldValue.FieldValues, fmt.Sprint(strconv.Itoa(i), "."))
}
} else {
formatFieldToString(buf, f, fieldValue, fieldPrefix)
}
}
}
}
func formatFieldToString(buf *bytes.Buffer, field Field, fieldValue FieldValue, fieldNrPrefix string) {
buf.WriteString("\t[")
buf.WriteString(util.RightPad2Len(field.GetLength().String(), " ", 8))
buf.WriteString(util.RightPad2Len(fieldTypeLookup[field.GetType()], " ", 5))
buf.WriteString(util.LeftPad2Len(strconv.Itoa(field.GetSize()), " ", 4))
buf.WriteString(" ")
//fieldValue := m.FieldValues[i]
buf.WriteString(util.LeftPad2Len(strconv.Itoa(len(fieldValue.String())), "0", 3))
buf.WriteString("] ")
buf.WriteString(util.RightPad2Len(fmt.Sprint(fieldNrPrefix, util.LeftPad2Len(strconv.Itoa(field.GetFieldNumber()), "0", 3)), " ", 7))
buf.WriteString(" [")
buf.WriteString(fieldValue.String())
buf.WriteString("]")
buf.WriteString("\n")
}