egg-tracer-sdwk/lib/tracer.js

tracer for egg

'use strict';

const uuid = require('uuid');

const TRACE_ID = Symbol('traceId');

class Tracer {
  constructor(ctx) {
    this.ctx = ctx;
  }

  get traceId() {
    const {ctx} = this
    //  ctx 未设置tracerId
    if (!this[TRACE_ID]) {
      let requestId = ctx.get('x-ca-request-id')
      if (!requestId ) {
        requestId = uuid.v1()
        ctx.set('x-ca-request-id', requestId)
        this[TRACE_ID] = `${ctx.app.name}/new/${process.pid}/${requestId}`
        return this[TRACE_ID]
      }
      this[TRACE_ID] = `${ctx.app.name}/inherit/${process.pid}/${requestId}`
      return this[TRACE_ID]
    }
    
    return this[TRACE_ID];
  }
}

module.exports = Tracer;