1.4.5.2

EdgeCommon/pkg/iplibrary/writer_v2.go

@@ -0,0 +1,190 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package iplibrary
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"hash"
+	"io"
+	"net"
+	"strconv"
+	"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 WriterV2 struct {
+	writer *hashWriter
+	meta   *Meta
+
+	lastCountryId  int64
+	lastProvinceId int64
+	lastCityId     int64
+	lastTownId     int64
+	lastProviderId int64
+}
+
+func NewWriterV2(writer io.Writer, meta *Meta) *WriterV2 {
+	if meta == nil {
+		meta = &Meta{}
+	}
+	meta.Version = Version2
+	meta.CreatedAt = time.Now().Unix()
+
+	var libWriter = &WriterV2{
+		writer: newHashWriter(writer),
+		meta:   meta,
+	}
+	return libWriter
+}
+
+func (this *WriterV2) 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 *WriterV2) 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 = fromIP.To4() != nil
+	var toIP = net.ParseIP(ipTo)
+	if toIP == nil {
+		return errors.New("invalid 'ipTo': " + ipTo)
+	}
+	var toIsIPv4 = toIP.To4() != nil
+	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
+	if bytes.Compare(fromIP, toIP) > 0 {
+		fromIP, toIP = toIP, fromIP
+	}
+
+	if fromIsIPv4 {
+		pieces = append(pieces, string(fromIP.To4())+string(toIP.To4()))
+	} else {
+		pieces = append(pieces, string(fromIP.To16())+string(toIP.To16()))
+	}
+
+	// 2
+	if countryId > 0 {
+		if countryId == this.lastCountryId {
+			pieces = append(pieces, "+")
+		} else {
+			pieces = append(pieces, this.formatUint64(uint64(countryId)))
+		}
+	} else {
+		pieces = append(pieces, "")
+	}
+	this.lastCountryId = countryId
+
+	// 3
+	if provinceId > 0 {
+		if provinceId == this.lastProvinceId {
+			pieces = append(pieces, "+")
+		} else {
+			pieces = append(pieces, this.formatUint64(uint64(provinceId)))
+		}
+	} else {
+		pieces = append(pieces, "")
+	}
+	this.lastProvinceId = provinceId
+
+	// 4
+	if cityId > 0 {
+		if cityId == this.lastCityId {
+			pieces = append(pieces, "+")
+		} else {
+			pieces = append(pieces, this.formatUint64(uint64(cityId)))
+		}
+	} else {
+		pieces = append(pieces, "")
+	}
+	this.lastCityId = cityId
+
+	// 5
+	if townId > 0 {
+		if townId == this.lastTownId {
+			pieces = append(pieces, "+")
+		} else {
+			pieces = append(pieces, this.formatUint64(uint64(townId)))
+		}
+	} else {
+		pieces = append(pieces, "")
+	}
+	this.lastTownId = townId
+
+	// 6
+	if providerId > 0 {
+		if providerId == this.lastProviderId {
+			pieces = append(pieces, "+")
+		} else {
+			pieces = append(pieces, this.formatUint64(uint64(providerId)))
+		}
+	} else {
+		pieces = append(pieces, "")
+	}
+	this.lastProviderId = providerId
+
+	_, err := this.writer.Write([]byte(strings.TrimRight(strings.Join(pieces, "|"), "|")))
+	if err != nil {
+		return err
+	}
+
+	_, err = this.writer.Write([]byte("\n"))
+	return err
+}
+
+func (this *WriterV2) Sum() string {
+	return this.writer.Sum()
+}
+
+func (this *WriterV2) formatUint64(i uint64) string {
+	return strconv.FormatUint(i, 32)
+}