egg-apigw-tracer/app/extend/context.js

适配 API 网关的 HTTP 请求示踪器，用于 Egg.js 框架

'use strict'

const TRACER = Symbol('context#tracer')
const Tracer = require('../../lib/tracer.js')

module.exports = {
  get tracer() {
    if (!this[TRACER]) {
      this[TRACER] = new Tracer(this)
    }
    return this[TRACER]
  },

  get traceId() {
    return this.tracer.traceId
  },
}