def fetch()

in experimenter/manifesttool/cli.py [0:0]

• 35 lines of code
• 13 McCabe index (conditional complexity)

def fetch(ctx: click.Context, *, summary_filename: Optional[Path], app_names: list[str]):
    """Fetch the FML manifests and generate experimenter.yaml files."""
    context = ctx.find_object(Context)

    results = []

    if app_names:
        for app_name in app_names:
            if app_name not in context.app_configs.root.keys():
                print(f"fetch: unknown app {app_name}", file=sys.stderr)
                sys.exit(1)
    else:
        app_names = context.app_configs.root.keys()

    for app_name in app_names:
        app_config = context.app_configs.root[app_name]

        app_dir = context.manifest_dir.joinpath(app_config.slug)
        app_dir.mkdir(exist_ok=True)

        if app_config.fml_path is not None:
            results.append(fetch_fml_app(context.manifest_dir, app_name, app_config))
        elif app_config.experimenter_yaml_path is not None:
            results.append(fetch_legacy_app(context.manifest_dir, app_name, app_config))
        else:  # pragma: no cover
            assert False, "unreachable"

        if app_config.release_discovery:
            ref_cache_path = app_dir / ".ref-cache.yaml"
            ref_cache = RefCache.load_or_create(ref_cache_path)

            results.extend(
                fetch_releases(context.manifest_dir, app_name, app_config, ref_cache)
            )

            ref_cache.write_to_file(ref_cache_path)

    summary_file = sys.stdout
    if summary_filename:
        summary_file = summary_filename.open("w")

    success_count, cache_count, fail_count = summarize_results(results, summary_file)

    if summary_filename:
        summary_file.close()

    # If we have any successful results, we'll exit normally. In CI, the PR will
    # include the generated summary, which will contain any failures.
    #
    # However, if all we have are failures and cache hits, we won't produce a
    # PR. Therefore we should exit(1) and cause the task to fail so it will be
    # noticed.
    if fail_count > 0 and success_count == 0:
        raise SystemExit(1)