The flask-openwhisk from alexmilowski

Content-Type application/json fails with OpenWhisk

Steps to reproduce

Pack the following files from this repo into a zip file: web.py flaskwsk and __main__.py
Deploy in Open Whisk
Send a POST request with a JSON payload, such as:

curl --request POST \
  --url https://eu-gb.functions.cloud.ibm.com/api/v1/web/salvador.de.la.puente.gonzalez%40ibm.com_dev/default/flask_ow_test/echo \
  --header 'content-type: application/json' \
  --cookie __cfduid=dee158ca1a645cf64da8b23de7b44a18b1586521938 \
  --data '{
	"hello": "world"
}'

Current behaviour

The following exception happens in exec__.py:

Activation: 'flask_ow_test' (8ed365ca91f245939365ca91f25593a1)
[
    "2020-04-11T15:19:13.981350Z    stderr: Traceback (most recent call last):",
    "2020-04-11T15:19:13.981400Z    stderr: File \"/action/1/src/exec__.py\", line 70, in <module>",
    "2020-04-11T15:19:13.981406Z    stderr: out.write(json.dumps(res, ensure_ascii=False).encode('utf-8'))",
    "2020-04-11T15:19:13.981410Z    stderr: File \"/usr/local/lib/python3.7/json/__init__.py\", line 238, in dumps",
    "2020-04-11T15:19:13.981414Z    stderr: **kw).encode(obj)",
    "2020-04-11T15:19:13.981418Z    stderr: File \"/usr/local/lib/python3.7/json/encoder.py\", line 199, in encode",
    "2020-04-11T15:19:13.981421Z    stderr: chunks = self.iterencode(o, _one_shot=True)",
    "2020-04-11T15:19:13.981425Z    stderr: File \"/usr/local/lib/python3.7/json/encoder.py\", line 257, in iterencode",
    "2020-04-11T15:19:13.981429Z    stderr: return _iterencode(o, 0)",
    "2020-04-11T15:19:13.981433Z    stderr: File \"/usr/local/lib/python3.7/json/encoder.py\", line 179, in default",
    "2020-04-11T15:19:13.981438Z    stderr: raise TypeError(f'Object of type {o.__class__.__name__} '",
    "2020-04-11T15:19:13.981442Z    stderr: TypeError: Object of type bytes is not JSON serializable",
    "2020-04-11T15:20:13.815Z       stderr: The action did not initialize or run as expected. Log data might be missing."
]

Expected behaviour

JSON is echoed.

Cause

The OpenWhisk launcher for Python 3 uses json.dumps() to write the request into out but the flaskwsk adaptor postprocess the body of the Flask response before sending it to Open Whisk. Specifically, it encodes the body into base64 if it is not a text content type. That causes the exception.

I solved it by reverting the base64 encoding and actually decoding the bytes into utf-8 but I'd be happy to discuss a better solution and provide a PR.

from base64 import b64decode

from flaskwsk import invoke

from web import app

def main(args: dict) -> dict:
    ow_response = invoke(app, args)
    content_type = ow_response.get('headers', {}).get('Content-Type', 'application/octet-stream')
    if content_type == 'application/json':
        data = b64decode(ow_response['body']).decode('utf-8')
        ow_response['body'] = data

    return ow_response

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Content-Type application/json fails with OpenWhisk

Steps to reproduce

Current behaviour

Expected behaviour

Cause

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