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process.py
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process.py
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import os
from datetime import datetime, timezone
from enum import IntEnum, auto
from multiprocessing.context import BaseContext
from signal import SIGINT
from typing import Any, Dict, Set
from sanic.log import Colors, logger
def get_now():
now = datetime.now(tz=timezone.utc)
return now
class ProcessState(IntEnum):
IDLE = auto()
STARTED = auto()
ACKED = auto()
JOINED = auto()
TERMINATED = auto()
class WorkerProcess:
SERVER_LABEL = "Server"
def __init__(self, factory, name, target, kwargs, worker_state):
self.state = ProcessState.IDLE
self.factory = factory
self.name = name
self.target = target
self.kwargs = kwargs
self.worker_state = worker_state
if self.name not in self.worker_state:
self.worker_state[self.name] = {
"server": self.SERVER_LABEL in self.name
}
self.spawn()
def set_state(self, state: ProcessState, force=False):
if not force and state < self.state:
raise Exception("...")
self.state = state
self.worker_state[self.name] = {
**self.worker_state[self.name],
"state": self.state.name,
}
def start(self):
os.environ["SANIC_WORKER_NAME"] = self.name
logger.debug(
f"{Colors.BLUE}Starting a process: {Colors.BOLD}"
f"{Colors.SANIC}%s{Colors.END}",
self.name,
)
self.set_state(ProcessState.STARTED)
self._process.start()
if not self.worker_state[self.name].get("starts"):
self.worker_state[self.name] = {
**self.worker_state[self.name],
"pid": self.pid,
"start_at": get_now(),
"starts": 1,
}
del os.environ["SANIC_WORKER_NAME"]
def join(self):
self.set_state(ProcessState.JOINED)
self._process.join()
def terminate(self):
if self.state is not ProcessState.TERMINATED:
logger.debug(
f"{Colors.BLUE}Terminating a process: "
f"{Colors.BOLD}{Colors.SANIC}"
f"%s {Colors.BLUE}[%s]{Colors.END}",
self.name,
self.pid,
)
self.set_state(ProcessState.TERMINATED, force=True)
try:
# self._process.terminate()
os.kill(self.pid, SIGINT)
del self.worker_state[self.name]
except (KeyError, AttributeError, ProcessLookupError):
...
def restart(self, **kwargs):
logger.debug(
f"{Colors.BLUE}Restarting a process: {Colors.BOLD}{Colors.SANIC}"
f"%s {Colors.BLUE}[%s]{Colors.END}",
self.name,
self.pid,
)
self._process.terminate()
self.set_state(ProcessState.IDLE, force=True)
self.kwargs.update(
{"config": {k.upper(): v for k, v in kwargs.items()}}
)
try:
self.spawn()
self.start()
except AttributeError:
raise RuntimeError("Restart failed")
self.worker_state[self.name] = {
**self.worker_state[self.name],
"pid": self.pid,
"starts": self.worker_state[self.name]["starts"] + 1,
"restart_at": get_now(),
}
def is_alive(self):
try:
return self._process.is_alive()
except AssertionError:
return False
def spawn(self):
if self.state is not ProcessState.IDLE:
raise Exception("Cannot spawn a worker process until it is idle.")
self._process = self.factory(
name=self.name,
target=self.target,
kwargs=self.kwargs,
daemon=True,
)
@property
def pid(self):
return self._process.pid
class Worker:
WORKER_PREFIX = "Sanic-"
def __init__(
self,
ident: str,
serve,
server_settings,
context: BaseContext,
worker_state: Dict[str, Any],
):
self.ident = ident
self.context = context
self.serve = serve
self.server_settings = server_settings
self.worker_state = worker_state
self.processes: Set[WorkerProcess] = set()
self.create_process()
def create_process(self) -> WorkerProcess:
process = WorkerProcess(
factory=self.context.Process,
name=f"{self.WORKER_PREFIX}{self.ident}-{len(self.processes)}",
target=self.serve,
kwargs={**self.server_settings},
worker_state=self.worker_state,
)
self.processes.add(process)
return process