| // Licensed to 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. Apache Software Foundation (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 core |
| |
| import ( |
| "fmt" |
| "strings" |
| "time" |
| ) |
| |
| var GetGoID = func() int64 { |
| return 0 |
| } |
| |
| var ( |
| idEpoch time.Time |
| globalInstanceID string |
| ) |
| |
| func init() { |
| idEpoch = time.Date(1900, 0, 0, 0, 0, 0, 0, time.UTC) |
| uuid, err := UUID() |
| if err != nil { |
| panic(err) |
| } |
| globalInstanceID = strings.ReplaceAll(uuid, "-", "") |
| } |
| |
| type IDContext struct { |
| goid int64 |
| lastTime int64 |
| seq int16 |
| |
| shift int64 |
| shitTime int64 |
| } |
| |
| func NewIDContext(getGoIDNow bool) *IDContext { |
| var goid int64 |
| if getGoIDNow { |
| goid = GetGoID() |
| } |
| return &IDContext{ |
| goid: goid, |
| lastTime: 0, |
| seq: 0, |
| } |
| } |
| |
| // GenerateGlobalID generates global unique id |
| func GenerateGlobalID(ctx *TracingContext) (globalID string, err error) { |
| idContext := ctx.ID |
| if idContext.goid == 0 { |
| idContext.goid = GetGoID() |
| } |
| |
| return fmt.Sprintf("%s.%d.%d", globalInstanceID, idContext.goid, idContext.nextID()), nil |
| } |
| |
| func (c *IDContext) nextID() int64 { |
| return c.timestamp()*10000 + int64(c.nextSeq()) |
| } |
| |
| func (c *IDContext) timestamp() int64 { |
| now := time.Since(idEpoch).Milliseconds() |
| if now < c.lastTime { |
| if c.shitTime != now { |
| c.shift++ |
| c.shitTime = now |
| } |
| return c.shift |
| } |
| c.lastTime = now |
| return now |
| } |
| |
| func (c *IDContext) nextSeq() int16 { |
| if c.seq == 10000 { |
| c.seq = 0 |
| } |
| c.seq++ |
| return c.seq |
| } |