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Add support for logging the response body #68

Description

@vstrimaitis

I'm using Flask and would like to extend the current request logs to include the request and response bodies. This is what I've attempted so far:

from flask import request

class RequestFormatter(json_logging.JSONLogWebFormatter):
    def _format_log_object(
        self, record: logging.LogRecord, request_util: json_logging.util.RequestUtil
    ):
        log_obj = super()._format_log_object(record, request_util)
        log_obj.update({
            "request_body": request.get_data(as_text=True),
            "response_body": "???"
        })
        return log_obj

# ...

json_logging.init_request_instrument(app=app, custom_formatter=RequestFormatter)

I can't find a way of getting the response body without some dirty hacks (e.g. monkey patching FlaskAppRequestInstrumentationConfigurator). Am I missing something or is this feature not implemented? Thanks!

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