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首页 > 应用开发 > Python > 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

原创 Python 作者：mingtian66 时间：2025-05-30 11:35:44 0 删除 编辑

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。

来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/70040412/viewspace-3086264/ ，如需转载，请注明出处，否则将追究法律责任。

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