1 版本
Sleuth版本:3.1.0
ZipKin版本:io.zipkin.brave:5.13.2
Logback版本:1.2.3
2 启动SpringBoot
2.1 构建MDCScopeDecorator属性
brave.baggage.CorrelationScopeDecorator.Builder
2.2 构建对象：MDCScopeDecorator
brave.context.slf4j.MDCScopeDecorator.Builder
2.3 填充属性：traceId和spanId
brave.baggage.CorrelationScopeDecorator.Builder
2.4 traceId和spanId
3 请求接口并打印日志
3.1 生成traceId
3.1.1 初始值
3.1.2 生成span
3.1.3 生成decorateContext
brave.Tracer#decorateContext(int, long, long, long, long, long, java.util.List
)
3.1.4 生成spanId
随机生成数据：
brave.Tracer#nextId
3.1.5 生成traceId
3.1.6 生成localRootId
3.1.7 生成span
3.1.8 添加请求属性
3.2 实际traceId
3.2.1 MDC添加traceId和值
3.2.2 生成最终的traceId
public String traceIdString() {
String r = traceIdString; if (r == null) {
r = toTraceIdString(traceIdHigh, traceId); traceIdString = r; } return r; } static String toTraceIdString(long traceIdHigh, long traceId) {
if (traceIdHigh != 0) {
char[] result = RecyclableBuffers.parseBuffer(); writeHexLong(result, 0, traceIdHigh); writeHexLong(result, 16, traceId); return new String(result, 0, 32); } return toLowerHex(traceId); } public static void writeHexLong(char[] data, int pos, long v) {
writeHexByte(data, pos + 0, (byte) ((v >>> 56L) & 0xff)); writeHexByte(data, pos + 2, (byte) ((v >>> 48L) & 0xff)); writeHexByte(data, pos + 4, (byte) ((v >>> 40L) & 0xff)); writeHexByte(data, pos + 6, (byte) ((v >>> 32L) & 0xff)); writeHexByte(data, pos + 8, (byte) ((v >>> 24L) & 0xff)); writeHexByte(data, pos + 10, (byte) ((v >>> 16L) & 0xff)); writeHexByte(data, pos + 12, (byte) ((v >>> 8L) & 0xff)); writeHexByte(data, pos + 14, (byte) (v & 0xff)); } static void writeHexByte(char[] data, int pos, byte b) {
data[pos + 0] = HEX_DIGITS[(b >> 4) & 0xf]; data[pos + 1] = HEX_DIGITS[b & 0xf]; } 3.3 更新traceId和spanId值
brave.baggage.CorrelationScopeDecorator.Multiple#decorateScope
3.4 更新方法
3.5 添加MDCAdapter
3.6 logbackMDCAdapter添加traceId
ch.qos.logback.classic.util.LogbackMDCAdapter#put
3.7 threadLocal中生成span
3.8 路径过滤
3.9 输出日志
3.10 传输traceId和spanId
4 日志中生成traceId和spanId
5 小结
- SpringBoot启动时在zipkin的包中配置MDCScopeDecorator属性，添加traceId和spanId；
- Sleuth版本:3.1.0：生成traceId和spanId直接使用traceId和spanId获取，日志格式为：[traceId=%X{traceId:-}, spanId=%X{spanId:-}]
- Logback天然配置MDC，通过LogbackMDCAdapter最终填充traceId和spanId值。
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