389 lines
14 KiB
Python
389 lines
14 KiB
Python
"""
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Lightweight Cloudflare Tunnel manager.
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Responsibilities:
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- Locate or download the cloudflared binary for the current platform.
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- Start/stop a quick tunnel pointing to the local ComfyUI server.
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- Track status and persist minimal state in the shared config.
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"""
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import asyncio
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import os
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import platform
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import re
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import shutil
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import signal
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import stat
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import subprocess
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import threading
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import time
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from urllib import request, error as urlerror
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from .config import load_config, save_config
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from .logging import debug_log, log
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from .network import get_server_port, normalize_host
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from .process import is_process_alive, terminate_process
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# Regex to capture the generated public URL from cloudflared output
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PUBLIC_URL_PATTERN = re.compile(r"(https?://[\w.-]+\.(?:trycloudflare\.com|cloudflare\.dev))", re.IGNORECASE)
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# Default timeout (seconds) to wait for a tunnel URL before giving up
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TUNNEL_START_TIMEOUT = 25
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class CloudflareTunnelManager:
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def __init__(self):
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self.process = None
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self.pid = None
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self.public_url = None
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self.last_error = None
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self.log_file = None
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self.status = "stopped"
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self.previous_master_host = None
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self._lock = asyncio.Lock()
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self._url_event = None
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self._reader_thread = None
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self._loop = None
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self._recent_logs = []
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self.binary_path = None
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self._restore_state()
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# --- Binary discovery & download ---
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@property
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def base_dir(self):
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return os.path.dirname(os.path.dirname(__file__))
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@property
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def bin_dir(self):
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return os.path.join(self.base_dir, "bin")
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def _get_asset_name(self):
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system = platform.system().lower()
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machine = platform.machine().lower()
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if system == "windows":
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if "arm" in machine:
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return "cloudflared-windows-arm64.exe"
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return "cloudflared-windows-amd64.exe"
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if system == "darwin":
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if machine in ("arm64", "aarch64"):
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return "cloudflared-darwin-arm64"
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return "cloudflared-darwin-amd64"
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if system == "linux":
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if machine in ("arm64", "aarch64"):
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return "cloudflared-linux-arm64"
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return "cloudflared-linux-amd64"
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raise RuntimeError(f"Unsupported platform for cloudflared: {system}/{machine}")
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def _download_cloudflared(self):
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asset = self._get_asset_name()
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url = f"https://github.com/cloudflare/cloudflared/releases/latest/download/{asset}"
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os.makedirs(self.bin_dir, exist_ok=True)
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target_path = os.path.join(self.bin_dir, "cloudflared.exe" if asset.endswith(".exe") else "cloudflared")
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debug_log(f"Downloading cloudflared from {url}")
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try:
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with request.urlopen(url, timeout=30) as resp:
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with open(target_path, "wb") as f:
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shutil.copyfileobj(resp, f)
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except urlerror.URLError as exc:
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raise RuntimeError(f"Failed to download cloudflared: {exc}") from exc
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# Make executable
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st = os.stat(target_path)
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os.chmod(target_path, st.st_mode | stat.S_IEXEC)
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debug_log(f"Downloaded cloudflared to {target_path}")
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return target_path
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def ensure_binary(self):
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# Allow explicit override
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env_path = os.environ.get("CLOUDFLARED_PATH")
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if env_path and os.path.exists(env_path):
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self.binary_path = env_path
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return env_path
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# Check cached path
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cached = self.binary_path
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if cached and os.path.exists(cached):
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return cached
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# Local bin directory
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candidate = os.path.join(self.bin_dir, "cloudflared.exe" if platform.system().lower() == "windows" else "cloudflared")
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if os.path.exists(candidate):
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self.binary_path = candidate
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return candidate
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# System PATH
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path_binary = shutil.which("cloudflared")
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if path_binary:
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self.binary_path = path_binary
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return path_binary
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# Download on demand
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self.binary_path = self._download_cloudflared()
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return self.binary_path
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# --- State helpers ---
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def _persist_state(self, status=None, public_url=None, pid=None, log_file=None, previous_host=None, master_host=None):
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cfg = load_config()
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tunnel_cfg = cfg.get("tunnel", {}) if isinstance(cfg.get("tunnel", {}), dict) else {}
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if status is not None:
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tunnel_cfg["status"] = status
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if public_url is not None:
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tunnel_cfg["public_url"] = public_url
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if pid is not None:
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tunnel_cfg["pid"] = pid
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if log_file is not None:
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tunnel_cfg["log_file"] = log_file
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if previous_host is not None:
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tunnel_cfg["previous_master_host"] = previous_host
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if master_host is not None:
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cfg.setdefault("master", {})["host"] = master_host
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cfg["tunnel"] = tunnel_cfg
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save_config(cfg)
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def _restore_state(self):
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cfg = load_config()
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tunnel_cfg = cfg.get("tunnel", {}) if isinstance(cfg.get("tunnel", {}), dict) else {}
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self.public_url = tunnel_cfg.get("public_url") or None
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self.previous_master_host = tunnel_cfg.get("previous_master_host")
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self.log_file = tunnel_cfg.get("log_file")
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pid = tunnel_cfg.get("pid")
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if pid and is_process_alive(pid):
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self.pid = pid
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self.status = tunnel_cfg.get("status", "running")
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debug_log(f"Detected existing cloudflared process (pid={pid})")
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else:
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# Clear stale info
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self._persist_state(status="stopped", public_url="", pid=None, log_file=None)
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self.status = "stopped"
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self.pid = None
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# --- Process output handling ---
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def _append_log(self, line):
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if self.log_file:
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try:
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with open(self.log_file, "a", encoding="utf-8", errors="replace") as f:
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f.write(line + "\n")
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except Exception as exc: # pragma: no cover - best effort logging
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debug_log(f"Failed to write tunnel log: {exc}")
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self._recent_logs.append(line)
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# Keep last ~200 lines to avoid unbounded growth
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if len(self._recent_logs) > 200:
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self._recent_logs = self._recent_logs[-200:]
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def _reader(self):
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assert self.process is not None
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loop = self._loop
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for raw_line in iter(self.process.stdout.readline, ""):
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line = raw_line.strip()
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if not line:
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continue
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self._append_log(line)
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match = PUBLIC_URL_PATTERN.search(line)
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if match and not self.public_url:
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self.public_url = match.group(1).rstrip("/")
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self.status = "running"
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if self._url_event and loop:
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loop.call_soon_threadsafe(self._url_event.set)
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# Capture obvious error strings
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if "error" in line.lower() and not self.last_error:
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self.last_error = line
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# Process exited
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if self.status == "starting" and not self.public_url:
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self.status = "error"
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if not self.last_error:
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self.last_error = "Cloudflare tunnel exited before becoming ready"
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if self._url_event and loop:
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loop.call_soon_threadsafe(self._url_event.set)
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elif self.status == "running":
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# Treat unexpected exit as stopped so UI can retry
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self.status = "stopped"
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elif self.status == "stopped":
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# Normal stop path, nothing to do
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pass
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# --- Public API ---
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async def start_tunnel(self):
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async with self._lock:
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if self.process and self.process.poll() is None:
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return {
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"status": self.status,
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"public_url": self.public_url,
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"pid": self.process.pid,
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"log_file": self.log_file,
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}
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# If we had a stale pid, ensure it's not running
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if self.pid and is_process_alive(self.pid):
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debug_log(f"Stopping stale cloudflared pid {self.pid} before starting a new one")
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await self.stop_tunnel()
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binary = await asyncio.to_thread(self.ensure_binary)
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port = get_server_port()
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self.status = "starting"
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self.last_error = None
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self.public_url = None
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self._recent_logs = []
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# Remember current master host so we can restore it if the tunnel stops
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config = load_config()
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master_host = (config.get("master") or {}).get("host") or ""
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tunnel_cfg = config.get("tunnel") or {}
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if tunnel_cfg.get("previous_master_host"):
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self.previous_master_host = tunnel_cfg.get("previous_master_host")
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else:
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self.previous_master_host = master_host
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os.makedirs(os.path.join(self.base_dir, "logs"), exist_ok=True)
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timestamp = time.strftime("%Y%m%d-%H%M%S")
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self.log_file = os.path.join(self.base_dir, "logs", f"cloudflare-{timestamp}.log")
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cmd = [
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binary,
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"tunnel",
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"--no-autoupdate",
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"--url",
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f"http://127.0.0.1:{port}",
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]
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debug_log(f"Starting cloudflared: {' '.join(cmd)}")
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try:
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self.process = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True,
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bufsize=1,
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)
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except FileNotFoundError:
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self.status = "error"
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raise RuntimeError("cloudflared binary not found")
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except Exception as exc:
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self.status = "error"
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raise RuntimeError(f"Failed to start cloudflared: {exc}") from exc
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self.pid = self.process.pid
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self._persist_state(
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status="starting",
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pid=self.pid,
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log_file=self.log_file,
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previous_host=self.previous_master_host
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)
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# Kick off background reader
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self._loop = asyncio.get_running_loop()
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self._url_event = asyncio.Event()
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self._reader_thread = threading.Thread(target=self._reader, daemon=True)
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self._reader_thread.start()
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try:
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await asyncio.wait_for(self._url_event.wait(), timeout=TUNNEL_START_TIMEOUT)
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except asyncio.TimeoutError:
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self.last_error = "Timed out waiting for Cloudflare to assign a URL"
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await self.stop_tunnel()
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raise RuntimeError(self.last_error)
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if self.status != "running" or not self.public_url:
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error_msg = self.last_error or "Cloudflare tunnel failed to start"
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await self.stop_tunnel()
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raise RuntimeError(error_msg)
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debug_log(f"Cloudflare tunnel ready at {self.public_url}")
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master_host = normalize_host(self.public_url)
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self._persist_state(
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status="running",
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public_url=self.public_url,
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pid=self.pid,
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log_file=self.log_file,
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previous_host=self.previous_master_host or "",
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master_host=master_host
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)
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return {
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"status": self.status,
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"public_url": self.public_url,
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"pid": self.pid,
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"log_file": self.log_file,
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}
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async def stop_tunnel(self):
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async with self._lock:
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pid = self.process.pid if self.process else self.pid
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if not pid:
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self._persist_state(status="stopped", public_url=None, pid=None, log_file=None)
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self.status = "stopped"
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return {"status": "stopped"}
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debug_log(f"Stopping cloudflared (pid={pid})")
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if self.process:
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terminate_process(self.process, timeout=5)
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else:
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try:
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os.kill(pid, signal.SIGTERM)
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time.sleep(0.5)
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except Exception as exc: # pragma: no cover - best effort
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debug_log(f"Error stopping cloudflared pid {pid}: {exc}")
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config = load_config()
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tunnel_cfg = config.get("tunnel", {}) if isinstance(config.get("tunnel", {}), dict) else {}
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self.previous_master_host = tunnel_cfg.get("previous_master_host", self.previous_master_host)
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active_url = tunnel_cfg.get("public_url")
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current_master_host = (config.get("master") or {}).get("host")
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restore_host = None
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if active_url:
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active_host = normalize_host(active_url)
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current_host = normalize_host(current_master_host)
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if current_host == active_host:
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restore_host = self.previous_master_host or ""
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self.status = "stopped"
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self.public_url = None
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self.pid = None
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self.process = None
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self.last_error = None
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self._url_event = None
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if self._reader_thread and self._reader_thread.is_alive():
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self._reader_thread.join(timeout=1)
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self._reader_thread = None
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self._persist_state(
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status="stopped",
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public_url="",
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pid=None,
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log_file=self.log_file,
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previous_host=self.previous_master_host,
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master_host=restore_host
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)
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return {"status": "stopped"}
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def get_status(self):
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alive = False
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pid = self.process.pid if self.process else self.pid
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if pid:
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alive = is_process_alive(pid)
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if not alive and self.status == "running":
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self.status = "stopped"
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return {
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"status": self.status,
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"public_url": self.public_url,
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"pid": pid,
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"log_file": self.log_file,
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"last_error": self.last_error,
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"binary_path": self.binary_path or shutil.which("cloudflared"),
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"recent_logs": self._recent_logs[-20:],
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"previous_master_host": self.previous_master_host,
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}
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# Singleton tunnel manager
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cloudflare_tunnel_manager = CloudflareTunnelManager()
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