Help - error when using Aiohttp with headers

[devachnid]

Firstly an apology: I'm new to Python so could be making a very silyl mistake here!

This code works as expected (I get a 401 Unauthorized response as I haven't sent the required authentication via headers)

import time
import hashlib
import hmac
import base64
import aiohttp

@service
def switch_bot_API(action=None, id=None):
    # open token
    token = '123456789' # copy and paste from the SwitchBot app V6.14 or later
    # secret key
    secret = 'abcdef' # copy and paste from the SwitchBot app V6.14 or later
    nonce = ''
    t = int(round(time.time() * 1000))
    string_to_sign = '{}{}{}'.format(token, t, nonce)

    string_to_sign = bytes(string_to_sign, 'utf-8')
    secret = bytes(secret, 'utf-8')

    sign = base64.b64encode(hmac.new(secret, msg=string_to_sign, digestmod=hashlib.sha256).digest())

    header = {
        'Authorization': token, 
        'sign': sign, 
        't': t, 
        'nonce': nonce
    }

    get_url = 'https://api.switch-bot.com/v1.1/devices'

    async with aiohttp.ClientSession() as session:
        async with session.get(url=get_url) as response:
            log.info(f"status {response.status}")
            text = response.text()
            log.info(f"text {text}")

If I change

    async with aiohttp.ClientSession() as session:
        async with session.get(url=get_url) as response:
            log.info(f"status {response.status}")
            text = response.text()
            log.info(f"text {text}")

to (adding the headers to the ClientSession object)

    async with aiohttp.ClientSession(headers=header) as session:
        async with session.get(url=get_url) as response:
            log.info(f"status {response.status}")
            text = response.text()
            log.info(f"text {text}")

The script doesn't work, I get the following error

2022-12-28 22:17:12.109 ERROR (MainThread) [custom_components.pyscript.file.switchbot.switch_bot_API] Exception in <file.switchbot.switch_bot_API> line 35:
            async with session.get(url=get_url) as response:
                                       ^
AttributeError: '_RequestContextManager' object has no attribute '_resp'

Google isn't helping me solve this - can anyone here help please?

[devachnid]

SOLVED!

In case anyone else comes across this I solved it by running the script in Python directly, which showed the true underlying error:

Traceback (most recent call last):
  File "/root/switchbot.py", line 47, in <module>
    loop.run_until_complete(main())
  File "/usr/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/root/switchbot.py", line 40, in main
    async with session.get(url=get_url) as response:
  File "/usr/local/lib/python3.9/dist-packages/aiohttp/client.py", line 1141, in __aenter__
    self._resp = await self._coro
  File "/usr/local/lib/python3.9/dist-packages/aiohttp/client.py", line 558, in _request
    resp = await req.send(conn)
  File "/usr/local/lib/python3.9/dist-packages/aiohttp/client_reqrep.py", line 670, in send
    await writer.write_headers(status_line, self.headers)
  File "/usr/local/lib/python3.9/dist-packages/aiohttp/http_writer.py", line 130, in write_headers
    buf = _serialize_headers(status_line, headers)
  File "aiohttp/_http_writer.pyx", line 132, in aiohttp._http_writer._serialize_headers
  File "aiohttp/_http_writer.pyx", line 109, in aiohttp._http_writer.to_str
TypeError: Cannot serialize non-str key b'anK+rbN/+dI5+IlSYizquwB1MT/2JhtnMneDHvadDyU='

The solution was to cast the variables I was using in the headers to strings.

[craigbarratt]

Good detective work. Unfortunately the error reporting in pyscript isn't always accurate or complete.