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from __future__ import annotations
import logging
import os
import signal
import sys
import threading
from pathlib import Path
from socket import socket
from types import FrameType
from typing import Callable, Iterator
import click
from uvicorn._subprocess import get_subprocess
from uvicorn.config import Config
HANDLED_SIGNALS = (
signal.SIGINT, # Unix signal 2. Sent by Ctrl+C.
signal.SIGTERM, # Unix signal 15. Sent by `kill <pid>`.
)
logger = logging.getLogger("uvicorn.error")
class BaseReload:
def __init__(
self,
config: Config,
target: Callable[[list[socket] | None], None],
sockets: list[socket],
) -> None:
self.config = config
self.target = target
self.sockets = sockets
self.should_exit = threading.Event()
self.pid = os.getpid()
self.is_restarting = False
self.reloader_name: str | None = None
def signal_handler(self, sig: int, frame: FrameType | None) -> None:
"""
A signal handler that is registered with the parent process.
"""
if sys.platform == "win32" and self.is_restarting:
self.is_restarting = False # pragma: py-not-win32
else:
self.should_exit.set() # pragma: py-win32
def run(self) -> None:
self.startup()
for changes in self:
if changes:
logger.warning(
"%s detected changes in %s. Reloading...",
self.reloader_name,
", ".join(map(_display_path, changes)),
)
self.restart()
self.shutdown()
def pause(self) -> None:
if self.should_exit.wait(self.config.reload_delay):
raise StopIteration()
def __iter__(self) -> Iterator[list[Path] | None]:
return self
def __next__(self) -> list[Path] | None:
return self.should_restart()
def startup(self) -> None:
message = f"Started reloader process [{self.pid}] using {self.reloader_name}"
color_message = "Started reloader process [{}] using {}".format(
click.style(str(self.pid), fg="cyan", bold=True),
click.style(str(self.reloader_name), fg="cyan", bold=True),
)
logger.info(message, extra={"color_message": color_message})
for sig in HANDLED_SIGNALS:
signal.signal(sig, self.signal_handler)
self.process = get_subprocess(
config=self.config, target=self.target, sockets=self.sockets
)
self.process.start()
def restart(self) -> None:
if sys.platform == "win32": # pragma: py-not-win32
self.is_restarting = True
assert self.process.pid is not None
os.kill(self.process.pid, signal.CTRL_C_EVENT)
else: # pragma: py-win32
self.process.terminate()
self.process.join()
self.process = get_subprocess(
config=self.config, target=self.target, sockets=self.sockets
)
self.process.start()
def shutdown(self) -> None:
if sys.platform == "win32":
self.should_exit.set() # pragma: py-not-win32
else:
self.process.terminate() # pragma: py-win32
self.process.join()
for sock in self.sockets:
sock.close()
message = "Stopping reloader process [{}]".format(str(self.pid))
color_message = "Stopping reloader process [{}]".format(
click.style(str(self.pid), fg="cyan", bold=True)
)
logger.info(message, extra={"color_message": color_message})
def should_restart(self) -> list[Path] | None:
raise NotImplementedError("Reload strategies should override should_restart()")
def _display_path(path: Path) -> str:
try:
return f"'{path.relative_to(Path.cwd())}'"
except ValueError:
return f"'{path}'"
|
