logging formatter that appends details of a flask request to a log record (in much the same way that the default formatter appends a traceback)

flask_request_logger.md

The way this solution inspects the flask context at the time of record formatting, rather than creation, is evil. Here is a better solution: https://gist.github.com/danielrichman/1acbbd66166ab857c404

flask_request_logger.py

class FlaskFormatter(logging.Formatter):
    def format(self, record):
        s = super(FlaskFormatter, self).format(record)
        try:
            if flask.has_request_context():
                if s[-1:] != "\n":
                    s = s + "\n"
                s += self.formatRequest(flask.request, flask.session)
        except:
            pass
        return s

    def formatRequest(self, request, session):
        bits = ["\nFlask Request: {r.method} {r.base_url!r}\n"
                "endpoint {r.endpoint}\n\n"
                    .format(r=request)]

        def dump_dict(bits, key, items):
            bits.append("{0}:\n".format(key))
            bits += ["    {0!r}: {1!r}\n".format(k, v) for k, v in items]
            bits.append("\n")

        dump_dict(bits, "args", request.args.iteritems(True))
        dump_dict(bits, "form", request.form.iteritems(True))
        dump_dict(bits, "cookies", request.cookies.iteritems())
        dump_dict(bits, "headers", request.headers.iteritems())
        dump_dict(bits, "session", session.iteritems())

        bits.append("data:\n    {0}".format(request.data))

        return ''.join(bits)