logviewer.py 文件源码

def get_log_metadata(golog_path):
    """
    Returns the metadata from the log at the given *golog_path* in the form of
    a dict.
    """
    metadata = {}
    if not os.path.getsize(golog_path): # 0 bytes
        return metadata # Nothing to do
    try:
        first_frame, distance = retrieve_first_frame(golog_path)
    except IOError:
        # Something wrong with the log...  Probably still being written to
        return metadata
    if first_frame[14:].startswith('{'):
        # This is JSON, capture metadata
        metadata = json_decode(first_frame[14:])
    return metadata # All done