forked from M-Labs/artiq
259 lines
9.5 KiB
Python
259 lines
9.5 KiB
Python
import asyncio
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import logging
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import subprocess
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import shlex
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import socket
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import os
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from artiq.protocols.sync_struct import Subscriber
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from artiq.protocols.pc_rpc import AsyncioClient
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from artiq.protocols.logging import LogParser
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from artiq.tools import Condition, TaskObject
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logger = logging.getLogger(__name__)
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class Controller:
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def __init__(self, name, ddb_entry):
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self.name = name
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self.command = ddb_entry["command"]
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self.retry_timer = ddb_entry.get("retry_timer", 5)
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self.retry_timer_backoff = ddb_entry.get("retry_timer_backoff", 1.1)
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self.host = ddb_entry["host"]
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self.port = ddb_entry["port"]
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self.ping_timer = ddb_entry.get("ping_timer", 30)
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self.ping_timeout = ddb_entry.get("ping_timeout", 30)
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self.term_timeout = ddb_entry.get("term_timeout", 30)
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self.retry_timer_cur = self.retry_timer
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self.retry_now = Condition()
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self.process = None
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self.launch_task = asyncio.ensure_future(self.launcher())
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async def end(self):
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self.launch_task.cancel()
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await asyncio.wait_for(self.launch_task, None)
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async def call(self, method, *args, **kwargs):
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remote = AsyncioClient()
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await remote.connect_rpc(self.host, self.port, None)
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try:
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targets, _ = remote.get_rpc_id()
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await remote.select_rpc_target(targets[0])
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r = await getattr(remote, method)(*args, **kwargs)
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finally:
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remote.close_rpc()
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return r
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async def _ping(self):
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try:
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ok = await asyncio.wait_for(self.call("ping"),
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self.ping_timeout)
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if ok:
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self.retry_timer_cur = self.retry_timer
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return ok
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except:
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return False
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async def _wait_and_ping(self):
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while True:
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try:
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await asyncio.wait_for(self.process.wait(),
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self.ping_timer)
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except asyncio.TimeoutError:
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logger.debug("pinging controller %s", self.name)
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ok = await self._ping()
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if not ok:
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logger.warning("Controller %s ping failed", self.name)
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await self._terminate()
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return
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else:
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break
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def _get_log_source(self):
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return "controller({})".format(self.name)
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async def launcher(self):
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try:
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while True:
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logger.info("Starting controller %s with command: %s",
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self.name, self.command)
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try:
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env = os.environ.copy()
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env["PYTHONUNBUFFERED"] = "1"
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self.process = await asyncio.create_subprocess_exec(
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*shlex.split(self.command),
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stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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env=env, start_new_session=True)
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asyncio.ensure_future(
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LogParser(self._get_log_source).stream_task(
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self.process.stdout))
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asyncio.ensure_future(
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LogParser(self._get_log_source).stream_task(
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self.process.stderr))
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await self._wait_and_ping()
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except FileNotFoundError:
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logger.warning("Controller %s failed to start", self.name)
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else:
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logger.warning("Controller %s exited", self.name)
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logger.warning("Restarting in %.1f seconds",
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self.retry_timer_cur)
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try:
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await asyncio.wait_for(self.retry_now.wait(),
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self.retry_timer_cur)
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except asyncio.TimeoutError:
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pass
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self.retry_timer_cur *= self.retry_timer_backoff
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except asyncio.CancelledError:
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await self._terminate()
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async def _terminate(self):
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if self.process is None or self.process.returncode is not None:
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logger.info("Controller %s already terminated", self.name)
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return
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logger.debug("Terminating controller %s", self.name)
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try:
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await asyncio.wait_for(self.call("terminate"), self.term_timeout)
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await asyncio.wait_for(self.process.wait(), self.term_timeout)
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logger.info("Controller %s terminated", self.name)
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return
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except:
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logger.warning("Controller %s did not exit on request, "
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"ending the process", self.name)
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if os.name != "nt":
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try:
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self.process.terminate()
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except ProcessLookupError:
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pass
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try:
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await asyncio.wait_for(self.process.wait(), self.term_timeout)
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logger.info("Controller process %s terminated", self.name)
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return
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except asyncio.TimeoutError:
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logger.warning("Controller process %s did not terminate, "
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"killing", self.name)
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try:
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self.process.kill()
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except ProcessLookupError:
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pass
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try:
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await asyncio.wait_for(self.process.wait(), self.term_timeout)
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logger.info("Controller process %s killed", self.name)
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return
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except asyncio.TimeoutError:
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logger.warning("Controller process %s failed to die", self.name)
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def get_ip_addresses(host):
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try:
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addrinfo = socket.getaddrinfo(host, None)
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except:
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return set()
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return {info[4][0] for info in addrinfo}
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class Controllers:
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def __init__(self):
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self.host_filter = None
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self.active_or_queued = set()
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self.queue = asyncio.Queue()
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self.active = dict()
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self.process_task = asyncio.ensure_future(self._process())
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async def _process(self):
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while True:
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action, param = await self.queue.get()
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if action == "set":
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k, ddb_entry = param
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if k in self.active:
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await self.active[k].end()
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self.active[k] = Controller(k, ddb_entry)
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elif action == "del":
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await self.active[param].end()
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del self.active[param]
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self.queue.task_done()
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if action not in ("set", "del"):
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raise ValueError
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def __setitem__(self, k, v):
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if (isinstance(v, dict) and v["type"] == "controller" and
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self.host_filter in get_ip_addresses(v["host"])):
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v["command"] = v["command"].format(name=k,
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bind=self.host_filter,
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port=v["port"])
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self.queue.put_nowait(("set", (k, v)))
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self.active_or_queued.add(k)
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def __delitem__(self, k):
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if k in self.active_or_queued:
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self.queue.put_nowait(("del", k))
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self.active_or_queued.remove(k)
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def delete_all(self):
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for name in set(self.active_or_queued):
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del self[name]
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async def shutdown(self):
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self.process_task.cancel()
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for c in self.active.values():
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await c.end()
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class ControllerDB:
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def __init__(self):
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self.current_controllers = Controllers()
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def set_host_filter(self, host_filter):
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self.current_controllers.host_filter = host_filter
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def sync_struct_init(self, init):
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if self.current_controllers is not None:
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self.current_controllers.delete_all()
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for k, v in init.items():
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self.current_controllers[k] = v
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return self.current_controllers
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class ControllerManager(TaskObject):
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def __init__(self, server, port, retry_master):
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self.server = server
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self.port = port
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self.retry_master = retry_master
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self.controller_db = ControllerDB()
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async def _do(self):
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try:
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subscriber = Subscriber("devices",
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self.controller_db.sync_struct_init)
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while True:
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try:
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def set_host_filter():
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s = subscriber.writer.get_extra_info("socket")
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localhost = s.getsockname()[0]
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self.controller_db.set_host_filter(localhost)
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await subscriber.connect(self.server, self.port,
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set_host_filter)
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try:
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await asyncio.wait_for(subscriber.receive_task, None)
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finally:
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await subscriber.close()
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except (ConnectionAbortedError, ConnectionError,
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ConnectionRefusedError, ConnectionResetError) as e:
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logger.warning("Connection to master failed (%s: %s)",
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e.__class__.__name__, str(e))
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else:
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logger.warning("Connection to master lost")
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logger.warning("Retrying in %.1f seconds", self.retry_master)
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await asyncio.sleep(self.retry_master)
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except asyncio.CancelledError:
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pass
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finally:
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await self.controller_db.current_controllers.shutdown()
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def retry_now(self, k):
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"""If a controller is disabled and pending retry, perform that retry
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now."""
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self.controller_db.current_controllers.active[k].retry_now.notify()
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