How launch a web service request from a string sroring this request in Python?

I have to code multiple Web Services calls.
For this, i use requests (import requests).

Each call has the same structure:

try:
retrieved_response = requests.get(url_call,
                                      auth=authentication,
                                      params=search_parameters,
                                      verify=False)
except requests.exceptions.HTTPError as http_error:
    logger.error("Bad Status Code", http_error.response)
    raise http_error
except [requests.exceptions.ConnectionError, requests.exceptions.ConnectTimeout] as connection_error:
    logger.error("Connection Problem ", connection_error.response)
    raise connection_error
except requests.exceptions.Timeout as timeout_error:
    logger.error("Time Out Exception ", timeout_error.response)
    raise timeout_error
except requests.exceptions.RequestException as error:
    logger.error("Request Error ", error.response)
    raise error

I want to create a generic function (or class method) that:
– takes as argument the request (get, post, etc) as a string
– executes this request passed as a simple string
– and returns the web service response

Like this:

def generic_call(call_request: str):
    call of the web service by launching the corresponding call request
    return the json response of the web service

   

Outside of this function, i just have to prepare a string storing my request call, and pass this string as parameter to this new generic function.

Until now, i do not know how launch a request from a string.
Could you please indicate me how launch a request from a string (a string that will store my request) ?

Thank you very much in advance,
Thomas

>Solution :

From your question and comments, I’m going to assume that you essentially just want to create a wrapper function that will execute the code that you give it and return the result.

You can do this a couple ways, the easiest (and not very safe) being to simply use eval

req = eval("request.call(web_service_url, auth=HTTPAuth(xxx,xxx), params={\"login\":\"toto\"})")

Wrap this into a function like:

def generic_call(requestString):
    return eval(requestString)

If you want a safer way, you could use if statements within a function and pass in arguments from outside like this:

def generic_call(method, **kwargs):
    if method=="GET":
        requests.get(...)
    elif method=="POST":
        requests.post(...)

Your question is worded a little weirdly, but I assume you meant the eval route. I would advise you put in the extra effort to create the if-elif function, especially if you are using user input into any of these arguments.