How to use the snakeviz.handler function in snakeviz

cumtime_percall = r.cummulativePer
            cumtime_percall_str = time_fmt.format(cumtime_percall)
            file_line_func = '{0}:{1}({2})'.format(r.filename,
                                                   r.lineno,
                                                   r.name)
            rows.append(StatsRow(calls_value, calls_str,
                                 tottime, tottime_str,
                                 tottime_percall, tottime_percall_str,
                                 cumtime, cumtime_str,
                                 cumtime_percall, cumtime_percall_str,
                                 file_line_func))

    return rows


class VizHandler(handler.Handler):
    """
    Handler for the main visualization page. Renders viz.html.

    """
    def get(self, profile_name):
        if self.request.path.startswith('/viz/file/'):
            if self.settings['single_user_mode']:
                # Allow opening arbitrary files by full filesystem path
                # WARNING!!! Obviously this must be disabled by default
                # TODO: Some modicum of error handling here as well...

                json_path = '/json/file/%s.json' % profile_name

                if profile_name[0] != '/' and platform.system() != 'Windows':
                    profile_name = '/' + profile_name
                filename = os.path.abspath(profile_name)

filename : str
        Any name to give a file.

    Returns
    -------
    tempname : str
        `filename` with temporary file directory prepended.

    """
    if len(filename) == 0:
        raise ValueError('filename must length greater than 0.')

    return os.path.join(tempfile.gettempdir(), filename)


class UploadHandler(handler.Handler):
    """
    Handler for a profile upload page. Not used in the command line
    version.

    """
    def get(self):
        self.render('upload.html')

    def post(self):
        filename = self.request.files['profile'][0]['filename']
        sfilename = storage_name(filename)

        # save the stats info to a file so it can be loaded by pstats
        with open(sfilename, 'wb') as f:
            f.write(self.request.files['profile'][0]['body'])