如何使用异步请求保存 JSON 响应？

Question

我有一个关于异步请求的问题：

如何即时将 response.json() 保存到文件？

我想发出请求并将响应保存到 .json 文件，而不将其保存在内存中。

import asyncio
import aiohttp


async def fetch(sem, session, url):
    async with sem:
        async with session.get(url) as response:
            return await response.json() # here


async def fetch_all(urls, loop):
    sem = asyncio.Semaphore(4) 
    async with aiohttp.ClientSession(loop=loop) as session:
        results = await asyncio.gather(
            *[fetch(sem, session, url) for url in urls]
        )
        return results


if __name__ == '__main__':

    urls = (
        "https://public.api.openprocurement.org/api/2.5/tenders/6a0585fcfb05471796bb2b6a1d379f9b",
        "https://public.api.openprocurement.org/api/2.5/tenders/d1c74ec8bb9143d5b49e7ef32202f51c",
        "https://public.api.openprocurement.org/api/2.5/tenders/a3ec49c5b3e847fca2a1c215a2b69f8d",
        "https://public.api.openprocurement.org/api/2.5/tenders/52d8a15c55dd4f2ca9232f40c89bfa82",
        "https://public.api.openprocurement.org/api/2.5/tenders/b3af1cc6554440acbfe1d29103fe0c6a",
        "https://public.api.openprocurement.org/api/2.5/tenders/1d1c6560baac4a968f2c82c004a35c90",
    ) 

    loop = asyncio.get_event_loop()
    data = loop.run_until_complete(fetch_all(urls, loop))
    print(data)

现在，脚本只打印 JSON 个文件，一旦它们全部被抓取，我就可以保存它们：

data = loop.run_until_complete(fetch_all(urls, loop))
for i, resp in enumerate(data):
    with open(f"{i}.json", "w") as f:
        json.dump(resp, f)

但我觉得不对，因为一旦我运行内存不足，它肯定会失败。

有什么建议吗？

编辑

将我的post限制为只有一个问题

Answer 1

How do I save response.json() to a file, on the fly?

首先不要使用 response.json()，而是使用 streaming API：

async def fetch(sem, session, url):
    async with sem, session.get(url) as response:
        with open("some_file_name.json", "wb") as out:
            async for chunk in response.content.iter_chunked(4096)
                out.write(chunk)

如何使用异步请求保存 JSON 响应？

How to save JSON responses with asynchronous requests?

python

python-asyncio

aiohttp

编辑