metrics/structured/gen_events.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""A utility for generating classes for structured metrics events.

Takes as input a structured.xml file describing all events and produces a C++
header and implementation file exposing builders for those events.
"""

import argparse
import sys

import codegen
import model
import templates


parser = argparse.ArgumentParser(
    description="Generate structured metrics events"
)
parser.add_argument("--input", help="Path to structured.xml")
parser.add_argument("--output", help="Path to generated files.")


def main():
    args = parser.parse_args()
    data = model.Model(open(args.input, encoding="utf-8").read())

    codegen.Template(
        data,
        args.output,
        "structured_events.h",
        file_template=templates.HEADER_FILE_TEMPLATE,
        project_template=templates.HEADER_PROJECT_TEMPLATE,
        event_template=templates.HEADER_EVENT_TEMPLATE,
        metric_template=templates.HEADER_METRIC_TEMPLATE,
    ).write_file()

    codegen.Template(
        data,
        args.output,
        "structured_events.cc",
        file_template=templates.IMPL_FILE_TEMPLATE,
        project_template=templates.IMPL_PROJECT_TEMPLATE,
        event_template=templates.IMPL_EVENT_TEMPLATE,
        metric_template=templates.IMPL_METRIC_TEMPLATE,
    ).write_file()

    return 0


if __name__ == "__main__":
    sys.exit(main())