somew1nd
e984d17635
- Set stdin=subprocess.DEVNULL across runtime, client, and utility subprocess calls to avoid hijacking the parent process's stdin. - Run awake service initialization asynchronously on a daemon thread in MCP server startup. - Redirect logger header printing to stderr to ensure stdio JSON-RPC purity. - Add unit and lifecycle tests for MCP stdio protocol handshake and stdin isolation.
322 lines
11 KiB
Python
322 lines
11 KiB
Python
# Copyright 2026 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Artemis Server Lifecycle and Process Management.
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Provides cross-platform facilities to discover, inspect, terminate,
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and restart running Artemis UI / backend server instances regardless
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of which terminal or process spawned them.
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"""
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from __future__ import annotations
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import json
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import os
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from pathlib import Path
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import shutil
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import socket
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import subprocess
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import sys
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import time
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from typing import Any
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from artemis.config.paths import ROOT_DIR, get_server_info_file
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from artemis.runtime.device_lock import DeviceExecutionLock
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from artemis.runtime.supervisor import ProcessSupervisor
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from artemis.utils.logger import get_logger
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logger = get_logger(__name__)
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def is_port_in_use(port: int, host: str = "127.0.0.1", timeout: float = 0.5) -> bool:
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"""Check whether a TCP port is currently listening / occupied."""
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
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s.settimeout(timeout)
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try:
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return s.connect_ex((host, port)) == 0
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except Exception:
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return False
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def write_server_info(
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port: int,
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host: str = "0.0.0.0",
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pid: int | None = None,
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) -> Path:
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"""Persist current Artemis server runtime metadata to well-known path."""
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info_file = get_server_info_file()
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try:
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info_file.parent.mkdir(parents=True, exist_ok=True)
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data = {
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"pid": pid or os.getpid(),
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"port": port,
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"host": host,
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"started_at": time.time(),
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"cwd": str(ROOT_DIR),
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"sys_executable": sys.executable,
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"cmdline": sys.argv,
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}
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info_file.write_text(json.dumps(data, indent=2), encoding="utf-8")
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logger.debug(f"Saved Artemis server info (PID: {data['pid']}, port: {port}) to {info_file}")
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except Exception as e:
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logger.warning(f"Could not persist server metadata to {info_file}: {e}")
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return info_file
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def read_server_info() -> dict[str, Any] | None:
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"""Read and validate the persisted server runtime metadata if present."""
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info_file = get_server_info_file()
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if not info_file.exists():
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return None
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try:
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content = info_file.read_text(encoding="utf-8").strip()
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if not content:
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return None
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data = json.loads(content)
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if isinstance(data, dict) and "pid" in data:
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return data
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except Exception as e:
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logger.debug(f"Failed to read server info from {info_file}: {e}")
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return None
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def clear_server_info() -> None:
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"""Remove the persisted server metadata file if it exists."""
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info_file = get_server_info_file()
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try:
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if info_file.exists():
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info_file.unlink()
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logger.debug(f"Cleared server info file at {info_file}")
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except Exception as e:
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logger.debug(f"Error clearing server info file {info_file}: {e}")
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def find_server_pids(port: int = 8000) -> list[int]:
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"""Find all process IDs associated with the Artemis server listening on `port`.
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Uses a multi-tiered discovery strategy:
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1. Check persisted server metadata file.
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2. Check port listeners via lsof (macOS/Linux), fuser (Linux), or netstat (Windows).
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3. Fallback to psutil net_connections and process table scan.
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"""
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discovered: set[int] = set()
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# 1. Check metadata file
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info = read_server_info()
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if info and info.get("port") == port:
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saved_pid = info.get("pid")
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if saved_pid and isinstance(saved_pid, int):
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try:
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import psutil
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if psutil.pid_exists(saved_pid):
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discovered.add(saved_pid)
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except Exception:
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try:
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os.kill(saved_pid, 0)
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discovered.add(saved_pid)
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except OSError:
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pass
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# 2. Check port listeners with platform-native tools
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# 2a. lsof (macOS & Linux)
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if shutil.which("lsof"):
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try:
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res = subprocess.run(
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["lsof", "-ti", f":{port}", "-sTCP:LISTEN"],
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stdin=subprocess.DEVNULL,
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capture_output=True,
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text=True,
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timeout=2.0,
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)
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if res.returncode == 0 and res.stdout.strip():
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for token in res.stdout.strip().splitlines():
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token = token.strip()
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if token.isdigit():
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discovered.add(int(token))
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except Exception:
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pass
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# 2b. fuser (Linux fallback)
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if not discovered and shutil.which("fuser"):
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try:
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res = subprocess.run(
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["fuser", f"{port}/tcp"],
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stdin=subprocess.DEVNULL,
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capture_output=True,
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text=True,
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timeout=2.0,
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)
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for token in res.stdout.strip().split():
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token = token.strip()
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if token.isdigit():
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discovered.add(int(token))
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except Exception:
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pass
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# 2c. netstat (Windows fallback)
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if not discovered and sys.platform == "win32":
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try:
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res = subprocess.run(
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["netstat", "-ano"],
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stdin=subprocess.DEVNULL,
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capture_output=True,
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text=True,
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timeout=3.0,
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)
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if res.returncode == 0:
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for line in res.stdout.splitlines():
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if f":{port}" in line and "LISTENING" in line.upper():
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parts = line.strip().split()
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if parts and parts[-1].isdigit():
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discovered.add(int(parts[-1]))
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except Exception:
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pass
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# 2d. psutil net_connections fallback
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if not discovered:
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try:
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import psutil
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for conn in psutil.net_connections(kind="inet"):
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if conn.laddr and conn.laddr.port == port:
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if conn.pid:
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discovered.add(conn.pid)
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except Exception:
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pass
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# 3. Process table scan if still nothing found on port but port is in use
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if not discovered and is_port_in_use(port):
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try:
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import psutil
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for proc in psutil.process_iter(["pid", "cmdline"]):
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try:
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cmdline = " ".join(proc.info.get("cmdline") or [])
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if "apps.admin_console.server" in cmdline or (
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"artemis" in cmdline and "ui" in cmdline
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):
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if proc.info.get("pid"):
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discovered.add(proc.info["pid"])
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except (psutil.NoSuchProcess, psutil.AccessDenied):
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continue
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except Exception:
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pass
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return sorted(discovered)
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def get_server_status(port: int = 8000) -> dict[str, Any]:
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"""Retrieve detailed status of the Artemis server on given port."""
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in_use = is_port_in_use(port)
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pids = find_server_pids(port)
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info = read_server_info()
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uptime_seconds: float | None = None
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if info and "started_at" in info and isinstance(info["started_at"], (int, float)):
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uptime_seconds = max(0.0, time.time() - info["started_at"])
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is_running = in_use or bool(pids)
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return {
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"running": is_running,
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"port": port,
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"pids": pids,
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"active_pid": pids[0] if pids else (info.get("pid") if info else None),
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"uptime_seconds": uptime_seconds,
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"url": f"http://localhost:{port}" if is_running else None,
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"admin_url": f"http://localhost:{port}/admin" if is_running else None,
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"metadata": info,
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}
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def stop_server(
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port: int = 8000,
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timeout: float = 4.0,
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force: bool = False,
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) -> tuple[bool, str, list[int]]:
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"""Gracefully terminate any running Artemis server on `port`.
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Args:
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port: TCP port to inspect and terminate.
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timeout: Maximum seconds to wait for graceful process exit.
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force: If True, immediately send SIGKILL without waiting.
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Returns:
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tuple (success, message, affected_pids)
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"""
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pids = find_server_pids(port)
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if not pids and not is_port_in_use(port):
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clear_server_info()
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DeviceExecutionLock.cleanup_stale_locks()
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return True, f"No active server detected on port {port}.", []
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# If no PID was discovered but port is still in use, try one more aggressive discovery
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if not pids and is_port_in_use(port):
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time.sleep(0.2)
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pids = find_server_pids(port)
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stopped_pids: list[int] = []
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current_pid = os.getpid()
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for pid in pids:
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if pid == current_pid:
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# Don't terminate self during stop_server call
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continue
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try:
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if force:
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ProcessSupervisor.terminate_tree(pid, timeout_seconds=0.5)
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else:
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ProcessSupervisor.terminate_tree(pid, timeout_seconds=timeout)
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stopped_pids.append(pid)
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except Exception as e:
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logger.warning(f"Failed to terminate process {pid}: {e}")
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# Wait for the port to actually become free
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deadline = time.time() + max(1.5, timeout)
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while time.time() < deadline:
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if not is_port_in_use(port):
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break
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time.sleep(0.15)
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# Force kill if port is still occupied
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if is_port_in_use(port) and not force:
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remaining_pids = find_server_pids(port)
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for pid in remaining_pids:
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if pid != current_pid:
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try:
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ProcessSupervisor.terminate_tree(pid, timeout_seconds=0.5)
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except Exception:
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pass
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time.sleep(0.3)
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# Cleanup stale device execution locks left by terminated server
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cleaned_locks = DeviceExecutionLock.cleanup_stale_locks()
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clear_server_info()
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port_free = not is_port_in_use(port)
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if port_free:
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pid_str = f" (PID: {', '.join(map(str, stopped_pids))})" if stopped_pids else ""
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msg = f"Artemis server stopped{pid_str}. Port {port} is released."
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if cleaned_locks:
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msg += f" Cleaned up {cleaned_locks} device lock(s)."
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return True, msg, stopped_pids
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else:
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return (
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False,
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f"Port {port} remains occupied after stop attempt. Some background process may require manual termination.",
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stopped_pids,
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)
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