How to use the biblib.util.chrono.chrono_trace function in biblib

# conf corpus
    corpus_service.clean_corpus(corpus)
    corpus_service.conf_corpus(corpus, "aime")
    date_clean = datetime.datetime.now()
    chrono.chrono_trace("Clean and conf corpus", date_begin, date_clean, None)

    # import
    corpus_service.import_metadata_file(corpus, input_file_path, input_format, source, rec_id_prefix, True, None)
    date_import = datetime.datetime.now()
    chrono.chrono_trace("Import corpus", date_clean, date_import, None)

    # Validate perio
    documents = repository_service.get_documents(corpus)
    validate_perios(documents, csv_file_path)
    date_validate = datetime.datetime.now()
    chrono.chrono_trace("Validate perio", date_import, date_validate, None)

def harvest_by_ids(corpus, target, ids):
    logging.info("harvest_by_ids: {}".format(ids))
    date_begin = datetime.datetime.now()

    # harvest
    metajson_list = []
    for identifier in ids:
        metajson_list.append(oaipmh_harvester.get_record(target, identifier))
    date_harvest = datetime.datetime.now()
    chrono.chrono_trace("harvest spire and convert to metajson", date_begin, date_harvest, len(ids))

    # import
    result_import = corpus_service.import_metajson_list(corpus, metajson_list, True, None)
    date_import = datetime.datetime.now()
    chrono.chrono_trace("import", date_harvest, date_import, len(result_import))

total_count = 0
        logging.info("# Import common fields:")
        if results_fields_common:
            for entry in results_fields_common:
                total_count += 1
                logging.info("rec_type: {}, _id: {}".format(entry["rec_type"], entry["_id"]))
        else:
            logging.info("Empty common fields")
        logging.info("# Import {} fields:".format(corpus))
        if results_fields_corpus:
            for entry in results_fields_corpus:
                total_count += 1
                logging.info("rec_type: {}, _id: {}".format(entry["rec_type"], entry["_id"]))
        else:
            logging.info("Empty {} fields".format(corpus))
        chrono.chrono_trace("conf_fields", date_types, date_fields, total_count)

chrono.chrono_trace("Validate corpus", date_path, date_validate, None)

    # export MetaJSON
    corpus_service.export_corpus(corpus, metajson_file_path, constants.FORMAT_METAJSON, True)
    date_export_metajson = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MetaJSON", date_validate, date_export_metajson, None)

    # export MODS
    corpus_service.export_corpus(corpus, mods_file_path, constants.FORMAT_MODS, True)
    date_export_mods = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MODS", date_export_metajson, date_export_mods, None)

    # export RePEc
    corpus_service.export_corpus(corpus, repec_file_path, constants.FORMAT_REPEC, True)
    date_export_repec = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as RePEc", date_export_mods, date_export_repec, None)

date_begin = datetime.datetime.now()

    # conf params
    corpus = "perio"
    source = "Sciences Po | la bibliothèque"
    rec_id_prefix = ""
    input_file_path = os.path.join("data", "unimarc", "periouni.mrc")
    input_format = constants.FORMAT_UNIMARC
    csv_file_name = "".join(["validation-", corpus, ".csv"])
    csv_file_path = os.path.join("data", "result", csv_file_name)

    # conf corpus
    corpus_service.clean_corpus(corpus)
    corpus_service.conf_corpus(corpus, "aime")
    date_clean = datetime.datetime.now()
    chrono.chrono_trace("Clean and conf corpus", date_begin, date_clean, None)

    # import
    corpus_service.import_metadata_file(corpus, input_file_path, input_format, source, rec_id_prefix, True, None)
    date_import = datetime.datetime.now()
    chrono.chrono_trace("Import corpus", date_clean, date_import, None)

    # Validate perio
    documents = repository_service.get_documents(corpus)
    validate_perios(documents, csv_file_path)
    date_validate = datetime.datetime.now()
    chrono.chrono_trace("Validate perio", date_import, date_validate, None)

error_file_path = os.path.join(data_result_dir, "result_validation_errors.txt")
    metajson_file_path = os.path.join(data_result_dir, "result_didl_metajson_spire.json")
    mods_file_path = os.path.join(data_result_dir, "result_didl_mods_spire.json")
    repec_file_path = os.path.join(data_result_dir, "result_repec.txt")

    date_path = datetime.datetime.now()

    # validate
    corpus_service.validate_corpus(corpus, error_file_path)
    date_validate = datetime.datetime.now()
    chrono.chrono_trace("Validate corpus", date_path, date_validate, None)

    # export MetaJSON
    corpus_service.export_corpus(corpus, metajson_file_path, constants.FORMAT_METAJSON, True)
    date_export_metajson = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MetaJSON", date_validate, date_export_metajson, None)

    # export MODS
    corpus_service.export_corpus(corpus, mods_file_path, constants.FORMAT_MODS, True)
    date_export_mods = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MODS", date_export_metajson, date_export_mods, None)

    # export RePEc
    corpus_service.export_corpus(corpus, repec_file_path, constants.FORMAT_REPEC, True)
    date_export_repec = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as RePEc", date_export_mods, date_export_repec, None)

def clean_corpus(corpus):
    if not corpus:
        logging.error("Error: empty corpus")
    else:
        logging.info("clean corpus: {}".format(corpus))

        date_begin = datetime.datetime.now()

        repository_service.create_corpus(corpus)
        repository_service.empty_corpus(corpus)
        repository_service.init_corpus_indexes(corpus)

        date_end = datetime.datetime.now()
        chrono.chrono_trace("clean_corpus", date_begin, date_end, None)

# import
    input_file_paths = io_service.get_relevant_file_list_by_format(input_dir_path, input_format)
    results = corpus_service.import_metadata_files(corpus, input_file_paths, input_format, source, rec_id_prefix, True, None)
    date_import = datetime.datetime.now()
    chrono.chrono_trace("Import corpus", date_clean, date_import, None)

    # Validate
    corpus_service.validate_corpus(corpus, error_file_path)
    date_validate = datetime.datetime.now()
    chrono.chrono_trace("Validate corpus", date_import, date_validate, None)

    # Export mods
    corpus_service.export_corpus(corpus, output_dir_path, constants.FORMAT_MODS, False, True)
    date_export_mods = datetime.datetime.now()
    chrono.chrono_trace("Export corpus mods", date_validate, date_export_mods, None)

    # Export oai_dc
    corpus_service.export_corpus(corpus, output_dir_path, constants.FORMAT_OAI_DC, False, True)
    date_export_oai_dc = datetime.datetime.now()
    chrono.chrono_trace("Export corpus oai_dc", date_export_mods, date_export_oai_dc, None)

date_path = datetime.datetime.now()

    # validate
    corpus_service.validate_corpus(corpus, error_file_path)
    date_validate = datetime.datetime.now()
    chrono.chrono_trace("Validate corpus", date_path, date_validate, None)

    # export MetaJSON
    corpus_service.export_corpus(corpus, metajson_file_path, constants.FORMAT_METAJSON, True)
    date_export_metajson = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MetaJSON", date_validate, date_export_metajson, None)

    # export MODS
    corpus_service.export_corpus(corpus, mods_file_path, constants.FORMAT_MODS, True)
    date_export_mods = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as MODS", date_export_metajson, date_export_mods, None)

    # export RePEc
    corpus_service.export_corpus(corpus, repec_file_path, constants.FORMAT_REPEC, True)
    date_export_repec = datetime.datetime.now()
    chrono.chrono_trace("Export corpus as RePEc", date_export_mods, date_export_repec, None)