以下是使用Python实现异步微服务链路追踪的完整方案，包含分布式追踪ID生成、日志记录和跨服务传递：

import uuid

import logging

import contextvars

from typing import Optional

from fastapi import Request, Response

REQUEST_ID_CTX = contextvars.ContextVar("request_id", default=None)

class RequestTracer:

@staticmethod

def generate_trace_id() -> str:

return f"trace-{uuid.uuid4().hex}"

@staticmethod

async def middleware(request: Request, call_next):

trace_id = request.headers.get("X-Trace-ID") or RequestTracer.generate_trace_id()

REQUEST_ID_CTX.set(trace_id)

response = await call_next(request)

response.headers["X-Trace-ID"] = trace_id

return response

@staticmethod

def get_current_trace() -> Optional[str]:

return REQUEST_ID_CTX.get()

class TraceLogger:

def __init__(self, name: str):

self.logger = logging.getLogger(name)

def info(self, message: str, **kwargs):

self.logger.info(f"[{REQUEST_ID_CTX.get()}] {message}", extra=kwargs)

from fastapi import FastAPI, Depends

from tracing import RequestTracer, TraceLogger

app = FastAPI()

app.middleware("http")(RequestTracer.middleware)

logger = TraceLogger(__name__)

@app.get("/service1")

async def service1():

logger.info("Entering service1")

# 模拟调用其他微服务

result = await call_service2()

return {"trace_id": RequestTracer.get_current_trace()}

async def call_service2():

# 实际项目中这里会通过HTTP客户端传递X-Trace-ID

logger.info("Calling service2")

return {"status": "ok"}

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import httpx

from tracing import RequestTracer

async def call_external_service(url: str):

headers = {}

if trace_id := RequestTracer.get_current_trace():

headers["X-Trace-ID"] = trace_id

async with httpx.AsyncClient() as client:

response = await client.get(url, headers=headers)

return response.json()

这个实现包含三个核心模块：1)追踪ID生成和传递中间件 2)带追踪ID的日志记录 3)HTTP客户端自动传递追踪头。使用时需安装fastapi和httpx包。

python模拟异步微服务请求链路追踪。 回答已暂停

python模拟异步微服务请求链路追踪。回答已暂停