trace_sprinter.py

import operator


def print_span(span):
    duration = span.end_time - span.start_time
    value = ' ' * span.start_time + '-' * duration
    print(value)


def print_nested_spans(parent_id, spans):
    children = sorted(list(filter(lambda x: x.parent_id == parent_id, spans)),
                      key=operator.attrgetter('start_time'))
    for child in children:
        print_span(child)
        print_nested_spans(child.id, spans)


def print_trace(spans):
    root_span_id = ''
    for span in spans:
        if span.parent_id is None:
            root_span_id = span.id
            print_span(span)

    print_nested_spans(root_span_id, spans)