metrics/structured/gen_events.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2020 The Chromium OS Authors. All rights reserved.
# 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).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())