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writer.go
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writer.go
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// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
package iplibrary
import (
"crypto/md5"
"encoding/json"
"errors"
"fmt"
"github.com/TeaOSLab/EdgeCommon/pkg/configutils"
"github.com/iwind/TeaGo/types"
"hash"
"io"
"net"
"strings"
"time"
)
type hashWriter struct {
rawWriter io.Writer
hash hash.Hash
}
func newHashWriter(writer io.Writer) *hashWriter {
return &hashWriter{
rawWriter: writer,
hash: md5.New(),
}
}
func (this *hashWriter) Write(p []byte) (n int, err error) {
n, err = this.rawWriter.Write(p)
this.hash.Write(p)
return
}
func (this *hashWriter) Sum() string {
return fmt.Sprintf("%x", this.hash.Sum(nil))
}
type Writer struct {
writer *hashWriter
meta *Meta
}
func NewWriter(writer io.Writer, meta *Meta) *Writer {
if meta == nil {
meta = &Meta{}
}
meta.Version = Version1
meta.CreatedAt = time.Now().Unix()
var libWriter = &Writer{
writer: newHashWriter(writer),
meta: meta,
}
return libWriter
}
func (this *Writer) WriteMeta() error {
metaJSON, err := json.Marshal(this.meta)
if err != nil {
return err
}
_, err = this.writer.Write(metaJSON)
if err != nil {
return err
}
_, err = this.writer.Write([]byte("\n"))
return err
}
func (this *Writer) Write(ipFrom string, ipTo string, countryId int64, provinceId int64, cityId int64, townId int64, providerId int64) error {
// validate IP
var fromIP = net.ParseIP(ipFrom)
if fromIP == nil {
return errors.New("invalid 'ipFrom': '" + ipFrom + "'")
}
var fromIsIPv4 = configutils.IsIPv4(fromIP)
var toIP = net.ParseIP(ipTo)
if toIP == nil {
return errors.New("invalid 'ipTo': " + ipTo)
}
var toIsIPv4 = configutils.IsIPv4(toIP)
if fromIsIPv4 != toIsIPv4 {
return errors.New("'ipFrom(" + ipFrom + ")' and 'ipTo(" + ipTo + ")' should have the same IP version")
}
var pieces = []string{}
// 0
if fromIsIPv4 {
pieces = append(pieces, "")
} else {
pieces = append(pieces, "6")
}
// 1
var fromIPLong = configutils.IP2Long(fromIP)
var toIPLong = configutils.IP2Long(toIP)
if toIPLong < fromIPLong {
fromIPLong, toIPLong = toIPLong, fromIPLong
}
pieces = append(pieces, types.String(fromIPLong))
if ipFrom == ipTo {
// 2
pieces = append(pieces, "")
} else {
// 2
pieces = append(pieces, types.String(toIPLong-fromIPLong))
}
// 3
if countryId > 0 {
pieces = append(pieces, types.String(countryId))
} else {
pieces = append(pieces, "")
}
// 4
if provinceId > 0 {
pieces = append(pieces, types.String(provinceId))
} else {
pieces = append(pieces, "")
}
// 5
if cityId > 0 {
pieces = append(pieces, types.String(cityId))
} else {
pieces = append(pieces, "")
}
// 6
if townId > 0 {
pieces = append(pieces, types.String(townId))
} else {
pieces = append(pieces, "")
}
// 7
if providerId > 0 {
pieces = append(pieces, types.String(providerId))
} else {
pieces = append(pieces, "")
}
_, err := this.writer.Write([]byte(strings.Join(pieces, "|")))
if err != nil {
return err
}
_, err = this.writer.Write([]byte("\n"))
return err
}
func (this *Writer) Sum() string {
return this.writer.Sum()
}