python项目在日志中 打印出详细的请求参数和返回的响应

为了打印出详细的请求参数和返回的响应，你可以使用FastAPI的中间件。以下是如何实现这一目标的示例：

1. 添加中间件以捕获请求和响应：

from fastapi import FastAPI, Request
import logging

app = FastAPI()

# 设置日志配置
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

@app.middleware("http")
async def log_request_response(request: Request, call_next):
    # 记录请求信息
    body = await request.body()
    logger.info(f"Request: {request.method} {request.url} - Body: {body.decode('utf-8')}")

    response = await call_next(request)

    # 记录响应信息
    response_body = b""
    async for chunk in response.body_iterator:
        response_body += chunk
    response.body_iterator = async_iterator([response_body])
    logger.info(f"Response: {response.status_code} - Body: {response_body.decode('utf-8')}")

    return response

# 注册你的路由
from app.api import router as api_router
app.include_router(api_router)

2. 更新路由文件以包含日志中间件：

# main.py
from fastapi import FastAPI
from app.api import router as api_router

app = FastAPI()

# 包含日志中间件
@app.middleware("http")
async def log_request_response(request: Request, call_next):
    body = await request.body()
    logger.info(f"Request: {request.method} {request.url} - Body: {body.decode('utf-8')}")

    response = await call_next(request)

    response_body = b""
    async for chunk in response.body_iterator:
        response_body += chunk
    response.body_iterator = async_iterator([response_body])
    logger.info(f"Response: {response.status_code} - Body: {response_body.decode('utf-8')}")

    return response

# 注册路由
app.include_router(api_router)

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)

这个中间件在处理请求时，会先记录请求的方法、URL和请求体内容，然后在返回响应之前记录响应的状态码和响应体内容。

请确保你的logging配置正确，方便记录详细日志信息。通过这种方式，你可以在日志中查看每个请求和响应的详细信息，从而更好地调试和监控你的应用程序。

辅助logging的详细配置信息：

import logging

logging_config = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "default": {
            "()": "uvicorn.logging.DefaultFormatter",
            "fmt": "%(levelprefix)s %(asctime)s %(message)s",
            "datefmt": "%Y-%m-%d %H:%M:%S",
        },
        "access": {
            "()": "uvicorn.logging.AccessFormatter",
            "fmt": "%(levelprefix)s %(asctime)s %(client_addr)s - '%(request_line)s' %(status_code)s",
            "datefmt": "%Y-%m-%d %H:%M:%S",
        },
    },
    "handlers": {
        "default": {
            "formatter": "default",
            "class": "logging.StreamHandler",
            "stream": "ext://sys.stdout",
        },
        "access": {
            "formatter": "access",
            "class": "logging.StreamHandler",
            "stream": "ext://sys.stdout",
        },
    },
    "loggers": {
        "uvicorn": {
            "handlers": ["default"],
            "level": "DEBUG",
            "propagate": False,
        },
        "uvicorn.access": {
            "handlers": ["access"],
            "level": "DEBUG",
            "propagate": False,
        },
    },
}

logging.config.dictConfig(logging_config)