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idgen.go
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idgen.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package trace
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
)
var traceIdGenerator = newIdGenerator()
var spanIdGeneratorMap = sync.Map{}
type IdGenerator struct {
index int64
pid string
hexIp string
}
type SpanKey struct {
TraceId string
SpanId string
}
func (spanKey *SpanKey) UniqueKey() string {
return spanKey.TraceId + "#" + spanKey.SpanId
}
// A span ID generator that generate a span ID like 0.1, 0.1.1, 0.1.2 etc.
type SpanIdGenerator struct {
key SpanKey // A combination of traceId and spanId
childIndex int64
}
func (generator *SpanIdGenerator) GenerateNextChildIndex() string {
atomic.AddInt64(&generator.childIndex, 1)
return generator.key.SpanId + "." + strconv.FormatInt(generator.childIndex, 10)
}
func IdGen() IdGenerator {
return *traceIdGenerator
}
func NewSpanIdGenerator(traceId, spanId string) *SpanIdGenerator {
return &SpanIdGenerator{
key: SpanKey{
TraceId: traceId,
SpanId: spanId,
},
childIndex: 1,
}
}
func AddSpanIdGenerator(generator *SpanIdGenerator) {
spanIdGeneratorMap.Store(generator.key.UniqueKey(), generator)
}
func GetSpanIdGenerator(key *SpanKey) *SpanIdGenerator {
value, ok := spanIdGeneratorMap.Load(key.UniqueKey())
if ok {
return value.(*SpanIdGenerator)
} else {
return nil
}
}
func DeleteSpanIdGenerator(key *SpanKey) {
spanIdGeneratorMap.Delete(key.UniqueKey())
}
func newIdGenerator() *IdGenerator {
hexIp := ipToHexString(GetIp())
return &IdGenerator{
index: 1000,
pid: strconv.Itoa(os.Getpid()),
hexIp: hexIp,
}
}
var index int64 = 1000
func (idGen IdGenerator) GenerateTraceId() string {
return idGen.hexIp + idGen.timeStamp() + idGen.nextId() + idGen.pid
}
func ipToHexString(ip string) string {
segments := strings.Split(ip, ".")
result := ""
for _, segment := range segments {
i, _ := strconv.Atoi(segment)
hexString := fmt.Sprintf("%02x", i)
result += hexString
}
return result
}
func GetIp() string {
interfaces, err := net.Interfaces()
if err != nil {
//TODO
}
for _, networkInterface := range interfaces {
addresses, err := networkInterface.Addrs()
if err != nil {
//TODO
}
for _, address := range addresses {
switch v := address.(type) {
case *net.IPNet:
if !v.IP.IsLoopback() {
ip := v.IP.To4()
if ip != nil {
return ip.String()
}
}
}
}
}
return ""
}
func (idGen IdGenerator) timeStamp() string {
return strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10)
}
func (idGen IdGenerator) nextId() string {
for {
var current = index
var next = current + 1
if current > 9000 {
next = 1000
}
if atomic.CompareAndSwapInt64(&index, current, next) {
return strconv.FormatInt(index, 10)
}
}
}