traceId-spanId 全链路追踪

traceId-spanId.js

// 根据 traceId 可以找出一个链路的所有请求

// 根据 spanId 可以就上面找到的所有请求画出调用树🌲


function a({ traceId, spanId, random }) {
  if (random > 0.5) {
    b({ traceId, spanId: spanId + "." + 1, random: Math.random() });
  } else {
    c({ traceId, spanId: spanId + "." + 1, random: Math.random() });
  }
}

function b({ traceId, spanId, random }) {
  if (random > 0.5) {
    d({ traceId, spanId: spanId + "." + 1, random: Math.random() });
  } else {
    c({ traceId, spanId: spanId + "." + 1, random: Math.random() });
    c({ traceId, spanId: spanId + "." + 2, random: Math.random() });
    c({ traceId, spanId: spanId + "." + 3, random: Math.random() });
  }
}

function c({ traceId, spanId }) {
  if (Math.random() > 0.5) return a({ traceId, spanId, random: Math.random() });
  console.log("c:", { traceId, spanId });
}

function d({ traceId, spanId }) {
  console.log("d", { traceId, spanId });
}

function getIp() {
  return "192.168.2.1";
}
function getPid() {
  return "11309";
}
function getTraceId() {
  return getIp() + new Date().getTime() + i++ + getPid();
}
let i = 100000;
function test() {
  const traceId = getTraceId();
  a({
    traceId,
    spanId: "0",
    random: Math.random(),
  });
}
test();