#!/usr/bin/env python3"""Run SwiftPM tests in suite shards so CI cannot hang inside one aggregate run.""" from __future__ import annotations import argparseimport osimport reimport signalimport subprocessimport sysfrom collections.abc import Iterablefrom dataclasses import dataclass  @dataclass(frozen=True)class TestSelection:    name: str    filter_pattern: str    suite_name: str | None = None  def parse_args() -> argparse.Namespace:    parser = argparse.ArgumentParser()    parser.add_argument("--group-size", type=int, default=12)    parser.add_argument("--timeout", type=int, default=180)    parser.add_argument("--limit-groups", type=int)    parser.add_argument("--shard-index", type=int)    parser.add_argument("--shard-count", type=int)    parser.add_argument("--list-only", action="store_true")    parser.add_argument("--swift-command", default="swift")    parser.add_argument("--swift-command-arg", action="append", default=[])    return parser.parse_args()  def run_command(command: list[str], timeout: int | None = None) -> int:    print(f"+ {' '.join(command)}", flush=True)    process = subprocess.Popen(command, start_new_session=True)    try:        return process.wait(timeout=timeout)    except subprocess.TimeoutExpired:        print(f"::warning::Command timed out after {timeout}s: {' '.join(command)}", flush=True)        os.killpg(process.pid, signal.SIGTERM)        try:            process.wait(timeout=10)        except subprocess.TimeoutExpired:            os.killpg(process.pid, signal.SIGKILL)            process.wait()        return 124  def swift_test_list(swift_command: list[str]) -> list[TestSelection]:    command = [*swift_command, "test", "list"]    try:        result = subprocess.run(command, check=True, capture_output=True, text=True)    except subprocess.CalledProcessError as error:        print(f"+ {swift_command[0]} test list", flush=True)        if error.stdout:            print(error.stdout, end="" if error.stdout.endswith("\n") else "\n", flush=True)        if error.stderr:            print(error.stderr, end="" if error.stderr.endswith("\n") else "\n", file=sys.stderr, flush=True)        raise    selections: set[TestSelection] = set()    unknown: list[str] = []    for line in result.stdout.splitlines():        top_level = re.fullmatch(r"(?P<module>[^.]+)\.(?:`(?P<display>.+)`|(?P<function>[^()/]+))\(\)", line)        if top_level is not None:            module = top_level.group("module")            test_name = top_level.group("display") or top_level.group("function")            selections.add(                TestSelection(                    name=line,                    # SwiftPM matches top-level Swift Testing functions by their display name,                    # not the backtick-wrapped identifier printed by `swift test list`.                    filter_pattern=rf"{re.escape(module)}\..*{re.escape(test_name)}",                )            )            continue         if "/" in line:            suite = line.split("/", 1)[0]            if "." in suite:                selections.add(                    TestSelection(                        name=suite,                        filter_pattern=rf"^{re.escape(suite)}/",                        suite_name=suite,                    )                )                continue         unknown.append(line)     if unknown:        rendered = "\n".join(f"- {line}" for line in unknown)        raise RuntimeError(f"Unrecognized `swift test list` output:\n{rendered}")    return sorted(selections, key=lambda selection: selection.name)  def chunks(items: list[TestSelection], size: int) -> Iterable[list[TestSelection]]:    for index in range(0, len(items), size):        yield items[index : index + size]  def shard_groups(groups: list[list[TestSelection]], shard_index: int | None, shard_count: int | None) -> list[list[TestSelection]]:    if shard_index is None and shard_count is None:        return groups    if shard_index is None or shard_count is None:        raise ValueError("--shard-index and --shard-count must be passed together")    if shard_count < 1:        raise ValueError("--shard-count must be positive")    if shard_index < 0 or shard_index >= shard_count:        raise ValueError("--shard-index must be in the range [0, --shard-count)")    return [group for index, group in enumerate(groups) if index % shard_count == shard_index]  def prioritized_suites(suites: list[TestSelection]) -> list[TestSelection]:    priority = ["CodexBarTests.CLIEntryTests"]    ordered = [suite for name in priority for suite in suites if suite.suite_name == name]    ordered.extend(suite for suite in suites if suite.suite_name not in priority)    return ordered  def filtered_suites_for_environment(suites: list[TestSelection]) -> list[TestSelection]:    if os.environ.get("GITHUB_ACTIONS") != "true" or sys.platform != "darwin":        return suites     # SwiftPM hangs before suite output for this executable-target suite on the Intel macOS runner.    # Linux CI still runs it in the full Swift test lane, and local macOS runs it directly.    skipped = {"CodexBarTests.CLIEntryTests"}    filtered = [suite for suite in suites if suite.suite_name not in skipped]    if len(filtered) != len(suites):        print(f"Skipping macOS CI-only suites: {', '.join(sorted(skipped))}", flush=True)    return filtered  def filter_for(suites: list[TestSelection]) -> str:    return rf"({'|'.join(suite.filter_pattern for suite in suites)})"  def run_group(suites: list[TestSelection], timeout: int, swift_command: list[str]) -> int:    return run_command(        [*swift_command, "test", "--no-parallel", "--filter", filter_for(suites)],        timeout=timeout,    )  def main() -> int:    args = parse_args()    if args.group_size < 1:        print("--group-size must be positive", file=sys.stderr)        return 2     swift_command = [args.swift_command, *args.swift_command_arg]    suites = prioritized_suites(filtered_suites_for_environment(swift_test_list(swift_command)))    suite_groups = list(chunks(suites, args.group_size))    try:        suite_groups = shard_groups(suite_groups, args.shard_index, args.shard_count)    except ValueError as error:        print(str(error), file=sys.stderr)        return 2    if args.limit_groups is not None:        suite_groups = suite_groups[: args.limit_groups]     shard_suffix = ""    if args.shard_index is not None and args.shard_count is not None:        shard_suffix = f" in shard {args.shard_index + 1}/{args.shard_count}"    print(f"Discovered {len(suites)} test selections; running {len(suite_groups)} groups{shard_suffix}", flush=True)    if args.list_only:        for group in suite_groups:            for suite in group:                print(suite.name)        return 0     if not suite_groups:        print("No test groups selected.", flush=True)        return 0     for group_index, group in enumerate(suite_groups, start=1):        print(            f"::group::Swift test shard {group_index}/{len(suite_groups)} "            f"({len(group)} selections)",            flush=True,        )        result = run_group(group, args.timeout, swift_command)        print("::endgroup::", flush=True)        if result == 0:            continue        if len(group) == 1:            return result         if result != 124:            print(f"Shard {group_index} failed with exit code {result}; retrying shard once", flush=True)            retry_result = run_group(group, args.timeout, swift_command)            if retry_result == 0:                continue            return retry_result         print(f"Shard {group_index} timed out; retrying suites one at a time", flush=True)        for suite in group:            print(f"::group::Swift test retry {suite.name}", flush=True)            retry_result = run_group([suite], args.timeout, swift_command)            print("::endgroup::", flush=True)            if retry_result != 0:                return retry_result     return 0  if __name__ == "__main__":    raise SystemExit(main())