hashbro
464 lines
17 KiB
Python
464 lines
17 KiB
Python
"""Channel build storage, locking, and builder orchestration."""
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from __future__ import annotations
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import ctypes
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import errno
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import fcntl
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import hashlib
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import json
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import os
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import re
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import shutil
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import subprocess
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import sys
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import time
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import uuid
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from contextlib import contextmanager
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any, Iterator
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CHANNEL_RE = re.compile(r"^[0-9a-z]{32}$")
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DOMAIN_RE = re.compile(
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r"^(?=.{1,253}\.?$)(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)*"
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r"[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.?$"
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)
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class ApiError(Exception):
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def __init__(self, status: int, code: str, message: str):
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super().__init__(message)
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self.status = status
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self.code = code
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self.message = message
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@dataclass(frozen=True)
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class Settings:
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artifact_root: Path
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bearer_token: str
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project_script: Path
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python: str = sys.executable
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build_timeout: int = 900
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@classmethod
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def from_env(cls) -> "Settings":
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repo_root = Path(__file__).resolve().parent.parent
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token = os.environ.get("BUILD_API_TOKEN", "")
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if not token:
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raise RuntimeError("BUILD_API_TOKEN is required")
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timeout = int(os.environ.get("BUILD_API_TIMEOUT", "900"))
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if timeout < 1:
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raise RuntimeError("BUILD_API_TIMEOUT must be positive")
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return cls(
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artifact_root=Path(
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os.environ.get("BUILD_API_ARTIFACT_ROOT", repo_root / "artifacts")
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),
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bearer_token=token,
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project_script=Path(
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os.environ.get(
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"BUILD_API_PROJECT_SCRIPT",
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repo_root / "frontend" / "tools" / "new_project.py",
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)
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),
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python=os.environ.get("BUILD_API_PYTHON", sys.executable),
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build_timeout=timeout,
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)
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class ChannelLock:
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def __init__(self, descriptor: int):
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self.descriptor = descriptor
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def close(self) -> None:
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try:
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fcntl.flock(self.descriptor, fcntl.LOCK_UN)
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finally:
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os.close(self.descriptor)
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class BuildService:
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def __init__(self, settings: Settings):
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self.settings = settings
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configured_root = settings.artifact_root.expanduser().absolute()
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configured_root.mkdir(parents=True, exist_ok=True)
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if configured_root.is_symlink() or not configured_root.is_dir():
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raise RuntimeError("artifact root must be a real directory")
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self.root = configured_root.resolve(strict=True)
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self.channels = self.root / "channel"
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self.staging = self.root / "staging"
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self.locks = self.root / "locks"
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self._prepare_storage()
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def _prepare_storage(self) -> None:
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for path in (self.channels, self.staging, self.locks):
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path.mkdir(mode=0o750, exist_ok=True)
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if path.is_symlink() or not path.is_dir():
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raise RuntimeError(f"managed path must be a real directory: {path}")
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root_device = self.root.stat().st_dev
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if any(path.stat().st_dev != root_device for path in (self.channels, self.staging)):
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raise RuntimeError("staging and channel directories must share a filesystem")
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def build(
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self, channel_id: str, request_input: dict[str, Any], *, force: bool
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) -> tuple[int, dict[str, Any], list[tuple[str, str]]]:
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self.validate_channel(channel_id)
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digest = self._digest(request_input)
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request_id = uuid.uuid4().hex
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with self._channel_lock(channel_id):
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destination = self._channel_path(channel_id)
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if self._path_exists(destination):
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self._assert_safe_tree(destination)
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current = self._read_manifest(destination)
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if current is None:
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raise ApiError(
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409,
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"existing_build_invalid",
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"channel release exists without a valid manifest",
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)
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if current.get("input_digest") == digest and not force:
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return 200, self._status_payload(channel_id, current), []
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if not force:
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raise ApiError(
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409,
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"build_conflict",
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"channel already exists with different build input",
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)
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stage = self._staging_path(request_id)
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stage.mkdir(mode=0o750)
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try:
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completed = self._run_builder(stage, channel_id, request_input)
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self._validate_output(stage, channel_id)
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release = self._read_manifest(stage) or {}
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manifest = {
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**release,
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"schema_version": 1,
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"channel_id": channel_id,
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"request_id": request_id,
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"input_digest": digest,
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"input": request_input,
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"built_at": int(time.time()),
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"support_path": release.get(
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"support_path", f"/channel/{channel_id}/web/support.html"
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),
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"daily_path": release.get(
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"daily_path", f"/channel/{channel_id}/sync/daily.html"
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),
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"builder": {
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"exit_code": completed.returncode,
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"stdout_sha256": hashlib.sha256(
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completed.stdout.encode("utf-8", "replace")
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).hexdigest(),
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},
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}
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self._replace_json(stage / "manifest.json", manifest)
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self._publish(stage, destination, request_id)
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except subprocess.TimeoutExpired as exc:
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raise ApiError(500, "build_timeout", "builder timed out") from exc
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except subprocess.CalledProcessError as exc:
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message = self._builder_error(exc)
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raise ApiError(500, "build_failed", message) from exc
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finally:
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if stage.exists():
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self._remove_staging(stage)
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return 201, self._status_payload(channel_id, manifest), [
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("Location", f"/v1/channels/{channel_id}")
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]
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def status(self, channel_id: str) -> dict[str, Any]:
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self.validate_channel(channel_id)
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destination = self._channel_path(channel_id)
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if not self._path_exists(destination):
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raise ApiError(404, "not_found", "channel release not found")
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self._assert_safe_tree(destination)
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manifest = self._read_manifest(destination)
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if manifest is None:
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raise ApiError(500, "invalid_release", "channel manifest is invalid")
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return self._status_payload(channel_id, manifest)
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def delete(self, channel_id: str) -> None:
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self.validate_channel(channel_id)
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with self._channel_lock(channel_id):
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destination = self._channel_path(channel_id)
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if self._path_exists(destination):
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self._safe_rmtree(destination)
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def _run_builder(
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self, stage: Path, channel_id: str, request_input: dict[str, Any]
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) -> subprocess.CompletedProcess[str]:
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script = self.settings.project_script
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if script.is_symlink() or not script.is_file():
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raise ApiError(500, "builder_unavailable", "builder script is unavailable")
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# Staging is created empty by the API; new_project refuses an existing
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# --root unless --force is set.
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command = [
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self.settings.python,
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str(script),
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"--root",
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str(stage),
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"--channel-id",
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channel_id,
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"--force",
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]
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for domain in request_input["deployment_domains"]:
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command.extend(["--deployment-domains", domain])
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for domain in request_input["reporting_domains"]:
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command.extend(["--reporting-domains", domain])
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return subprocess.run(
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command,
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cwd=str(Path(__file__).resolve().parent.parent),
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check=True,
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capture_output=True,
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text=True,
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timeout=self.settings.build_timeout,
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env={**os.environ, "PYTHONUNBUFFERED": "1"},
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)
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def _publish(self, stage: Path, destination: Path, request_id: str) -> None:
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self._assert_safe_tree(stage)
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backup = self.channels / f".replaced-{destination.name}-{request_id}"
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moved_old = False
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try:
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if self._path_exists(destination):
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self._assert_safe_tree(destination)
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if self._exchange_directories(stage, destination):
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self._safe_rmtree(stage)
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self._fsync_directory(self.channels)
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return
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os.rename(destination, backup)
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moved_old = True
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os.rename(stage, destination)
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except Exception:
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if (
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moved_old
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and not self._path_exists(destination)
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and self._path_exists(backup)
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):
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os.rename(backup, destination)
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raise
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self._fsync_directory(self.channels)
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if self._path_exists(backup):
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self._safe_rmtree(backup)
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@staticmethod
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def _exchange_directories(first: Path, second: Path) -> bool:
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"""Atomically exchange directories on Linux; return false if unsupported."""
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if not sys.platform.startswith("linux"):
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return False
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libc = ctypes.CDLL(None, use_errno=True)
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renameat2 = getattr(libc, "renameat2", None)
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if renameat2 is None:
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return False
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renameat2.argtypes = [
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ctypes.c_int,
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ctypes.c_char_p,
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ctypes.c_int,
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ctypes.c_char_p,
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ctypes.c_uint,
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]
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renameat2.restype = ctypes.c_int
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result = renameat2(
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-100,
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os.fsencode(first),
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-100,
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os.fsencode(second),
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2,
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)
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if result == 0:
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return True
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error = ctypes.get_errno()
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if error in (errno.ENOSYS, errno.EINVAL, errno.ENOTSUP):
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return False
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raise OSError(error, os.strerror(error))
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def _validate_output(self, stage: Path, channel_id: str) -> None:
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required_dirs = (stage / "web", stage / "sync", stage / "out")
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if any(not path.is_dir() or path.is_symlink() for path in required_dirs):
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raise ApiError(
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500,
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"invalid_build_output",
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"builder must produce web, sync, and out directories",
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)
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required_files = (
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stage / "web" / "support.html",
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stage / "sync" / "daily.html",
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stage / "manifest.json",
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)
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if any(not path.is_file() or path.is_symlink() for path in required_files):
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raise ApiError(
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500,
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"invalid_build_output",
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"builder must produce support.html, daily.html, and manifest.json",
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)
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release = self._read_manifest(stage)
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if not release or release.get("channel_id") != channel_id:
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raise ApiError(
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500,
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"invalid_build_output",
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"builder manifest channel_id does not match request",
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)
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self._assert_safe_tree(stage)
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@staticmethod
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def normalize_domains(value: list[str], field: str) -> list[str]:
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if not value or len(value) > 8:
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raise ApiError(
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422, "validation_error", f"{field} must contain 1 to 8 domains"
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)
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result: list[str] = []
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for item in value:
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domain = item.strip().lower()
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if not DOMAIN_RE.fullmatch(domain):
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raise ApiError(
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422, "validation_error", f"{field} contains an invalid domain"
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)
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result.append(domain.rstrip("."))
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if len(set(result)) != len(result):
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raise ApiError(
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422, "validation_error", f"{field} must not contain duplicates"
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)
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return result
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@staticmethod
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def validate_channel(channel_id: str) -> None:
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if not CHANNEL_RE.fullmatch(channel_id):
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raise ApiError(
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422,
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"validation_error",
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"channel id must be 32 lowercase alphanumeric characters",
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)
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@contextmanager
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def _channel_lock(self, channel_id: str) -> Iterator[ChannelLock]:
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path = self.locks / f"{channel_id}.lock"
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flags = os.O_CREAT | os.O_RDWR
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if hasattr(os, "O_NOFOLLOW"):
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flags |= os.O_NOFOLLOW
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try:
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descriptor = os.open(path, flags, 0o640)
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except OSError as exc:
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raise ApiError(409, "channel_locked", "channel lock is unavailable") from exc
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lock = ChannelLock(descriptor)
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try:
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try:
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fcntl.flock(descriptor, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except OSError as exc:
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if exc.errno in (errno.EACCES, errno.EAGAIN):
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raise ApiError(
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409, "channel_locked", "another channel operation is in progress"
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) from exc
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raise
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yield lock
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finally:
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lock.close()
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def _channel_path(self, channel_id: str) -> Path:
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return self._contained(self.channels, self.channels / channel_id)
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def _staging_path(self, request_id: str) -> Path:
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return self._contained(self.staging, self.staging / request_id)
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@staticmethod
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def _contained(parent: Path, child: Path) -> Path:
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if child.parent != parent or not child.is_relative_to(parent):
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raise ApiError(500, "unsafe_path", "managed path escaped its root")
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return child
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@staticmethod
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def _assert_safe_tree(path: Path) -> None:
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if path.is_symlink() or not path.is_dir():
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raise ApiError(409, "unsafe_release", "managed release is not a real directory")
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for root, directories, files in os.walk(path, followlinks=False):
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for name in (*directories, *files):
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entry = Path(root) / name
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if entry.is_symlink():
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raise ApiError(
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409, "unsafe_release", "managed release contains a symbolic link"
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)
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def _safe_rmtree(self, path: Path) -> None:
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self._assert_safe_tree(path)
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shutil.rmtree(path)
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def _remove_staging(self, path: Path) -> None:
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"""Remove an unpublished builder tree without following child symlinks."""
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self._contained(self.staging, path)
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if path.is_symlink() or not path.is_dir():
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raise ApiError(500, "unsafe_path", "staging root is not a real directory")
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shutil.rmtree(path)
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@staticmethod
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def _path_exists(path: Path) -> bool:
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return os.path.lexists(path)
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@staticmethod
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def _fsync_directory(path: Path) -> None:
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descriptor = os.open(path, os.O_RDONLY)
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try:
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os.fsync(descriptor)
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finally:
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os.close(descriptor)
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@staticmethod
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def _replace_json(path: Path, value: dict[str, Any]) -> None:
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"""Atomically overwrite JSON that the builder may already have created."""
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data = json.dumps(value, sort_keys=True, indent=2).encode() + b"\n"
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temporary = path.with_name(f".{path.name}.{uuid.uuid4().hex}.tmp")
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descriptor = os.open(temporary, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o640)
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try:
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with os.fdopen(descriptor, "wb") as stream:
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stream.write(data)
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stream.flush()
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os.fsync(stream.fileno())
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os.replace(temporary, path)
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except Exception:
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if temporary.exists():
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temporary.unlink()
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raise
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@staticmethod
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def _read_manifest(destination: Path) -> dict[str, Any] | None:
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if destination.is_symlink() or not destination.is_dir():
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return None
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manifest_path = destination / "manifest.json"
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if manifest_path.is_symlink() or not manifest_path.is_file():
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return None
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try:
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value = json.loads(manifest_path.read_text(encoding="utf-8"))
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except (OSError, UnicodeDecodeError, json.JSONDecodeError):
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return None
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return value if isinstance(value, dict) else None
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@staticmethod
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def _digest(value: dict[str, Any]) -> str:
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canonical = json.dumps(
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value, sort_keys=True, separators=(",", ":"), ensure_ascii=True
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).encode()
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return hashlib.sha256(canonical).hexdigest()
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@staticmethod
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def _status_payload(channel_id: str, manifest: dict[str, Any]) -> dict[str, Any]:
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return {
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"status": "built",
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"channel_id": channel_id,
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"request_id": manifest.get("request_id"),
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"release_path": f"channel/{channel_id}",
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"support_path": manifest.get(
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"support_path", f"/channel/{channel_id}/web/support.html"
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),
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"daily_path": manifest.get(
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"daily_path", f"/channel/{channel_id}/sync/daily.html"
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),
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"manifest": manifest,
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}
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@staticmethod
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def _builder_error(exc: subprocess.CalledProcessError) -> str:
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stderr = (exc.stderr or "").strip().splitlines()
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detail = stderr[-1][:500] if stderr else "builder exited unsuccessfully"
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return f"builder failed: {detail}"
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