You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
1.5 KiB
86 lines
1.5 KiB
2 years ago
|
package mps
|
||
|
|
||
|
import (
|
||
|
"encoding/binary"
|
||
|
"io"
|
||
|
)
|
||
|
|
||
|
const (
|
||
|
DEBIT = byte(iota)
|
||
|
CREDIT
|
||
|
STARTAUTOPAY
|
||
|
ENDAUTOPAY
|
||
|
)
|
||
|
|
||
|
// | 4 byte magic string "MPS7" | 1 byte version | 4 byte (uint32) # of records |
|
||
|
|
||
|
// | 1 byte record type enum | 4 byte (uint32) Unix timestamp | 8 byte (uint64) user ID |
|
||
|
type Record struct {
|
||
|
Type byte
|
||
|
Time uint32
|
||
|
UserId uint64
|
||
|
Amount float64
|
||
|
}
|
||
|
|
||
|
type TransactionLog struct {
|
||
|
Header Header
|
||
|
Records []Record
|
||
|
}
|
||
|
|
||
|
// | 4 byte magic string "MPS7" | 1 byte version | 4 byte (uint32) # of records |
|
||
|
type Header struct {
|
||
|
Magic [4]byte
|
||
|
Version int8
|
||
|
RecordCount uint32
|
||
|
}
|
||
|
|
||
|
func parseHeader(r io.Reader, h *Header) error {
|
||
|
err := binary.Read(r, binary.BigEndian, h)
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
func parseRecord(r io.Reader, record *Record) error {
|
||
|
err := binary.Read(r, binary.BigEndian, &record.Type)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
err = binary.Read(r, binary.BigEndian, &record.Time)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
err = binary.Read(r, binary.BigEndian, &record.UserId)
|
||
|
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
if record.Type == CREDIT || record.Type == DEBIT {
|
||
|
err = binary.Read(r, binary.BigEndian, &record.Amount)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func Parse(r io.Reader) (*TransactionLog, error) {
|
||
|
var tx TransactionLog
|
||
|
err := parseHeader(r, &tx.Header)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
|
||
|
for i := 0; i < int(tx.Header.RecordCount); i++ {
|
||
|
var record Record
|
||
|
err := parseRecord(r, &record)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
tx.Records = append(tx.Records, record)
|
||
|
}
|
||
|
|
||
|
return &tx, nil
|
||
|
}
|