mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-22 18:53:38 +00:00
360 lines
13 KiB
Python
360 lines
13 KiB
Python
#
|
|
# Copyright 2009 Facebook
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""Automatically restart the server when a source file is modified.
|
|
|
|
Most applications should not access this module directly. Instead,
|
|
pass the keyword argument ``autoreload=True`` to the
|
|
`tornado.web.Application` constructor (or ``debug=True``, which
|
|
enables this setting and several others). This will enable autoreload
|
|
mode as well as checking for changes to templates and static
|
|
resources. Note that restarting is a destructive operation and any
|
|
requests in progress will be aborted when the process restarts. (If
|
|
you want to disable autoreload while using other debug-mode features,
|
|
pass both ``debug=True`` and ``autoreload=False``).
|
|
|
|
This module can also be used as a command-line wrapper around scripts
|
|
such as unit test runners. See the `main` method for details.
|
|
|
|
The command-line wrapper and Application debug modes can be used together.
|
|
This combination is encouraged as the wrapper catches syntax errors and
|
|
other import-time failures, while debug mode catches changes once
|
|
the server has started.
|
|
|
|
This module will not work correctly when `.HTTPServer`'s multi-process
|
|
mode is used.
|
|
|
|
Reloading loses any Python interpreter command-line arguments (e.g. ``-u``)
|
|
because it re-executes Python using ``sys.executable`` and ``sys.argv``.
|
|
Additionally, modifying these variables will cause reloading to behave
|
|
incorrectly.
|
|
|
|
"""
|
|
|
|
import os
|
|
import sys
|
|
|
|
# sys.path handling
|
|
# -----------------
|
|
#
|
|
# If a module is run with "python -m", the current directory (i.e. "")
|
|
# is automatically prepended to sys.path, but not if it is run as
|
|
# "path/to/file.py". The processing for "-m" rewrites the former to
|
|
# the latter, so subsequent executions won't have the same path as the
|
|
# original.
|
|
#
|
|
# Conversely, when run as path/to/file.py, the directory containing
|
|
# file.py gets added to the path, which can cause confusion as imports
|
|
# may become relative in spite of the future import.
|
|
#
|
|
# We address the former problem by reconstructing the original command
|
|
# line (Python >= 3.4) or by setting the $PYTHONPATH environment
|
|
# variable (Python < 3.4) before re-execution so the new process will
|
|
# see the correct path. We attempt to address the latter problem when
|
|
# tornado.autoreload is run as __main__.
|
|
|
|
if __name__ == "__main__":
|
|
# This sys.path manipulation must come before our imports (as much
|
|
# as possible - if we introduced a tornado.sys or tornado.os
|
|
# module we'd be in trouble), or else our imports would become
|
|
# relative again despite the future import.
|
|
#
|
|
# There is a separate __main__ block at the end of the file to call main().
|
|
if sys.path[0] == os.path.dirname(__file__):
|
|
del sys.path[0]
|
|
|
|
import functools
|
|
import os
|
|
import pkgutil # type: ignore
|
|
import sys
|
|
import traceback
|
|
import types
|
|
import subprocess
|
|
import weakref
|
|
|
|
from tornado import ioloop
|
|
from tornado.log import gen_log
|
|
from tornado import process
|
|
from tornado.util import exec_in
|
|
|
|
try:
|
|
import signal
|
|
except ImportError:
|
|
signal = None # type: ignore
|
|
|
|
import typing
|
|
from typing import Callable, Dict
|
|
|
|
if typing.TYPE_CHECKING:
|
|
from typing import List, Optional, Union # noqa: F401
|
|
|
|
# os.execv is broken on Windows and can't properly parse command line
|
|
# arguments and executable name if they contain whitespaces. subprocess
|
|
# fixes that behavior.
|
|
_has_execv = sys.platform != "win32"
|
|
|
|
_watched_files = set()
|
|
_reload_hooks = []
|
|
_reload_attempted = False
|
|
_io_loops = weakref.WeakKeyDictionary() # type: ignore
|
|
_autoreload_is_main = False
|
|
_original_argv = None # type: Optional[List[str]]
|
|
_original_spec = None
|
|
|
|
|
|
def start(check_time: int = 500) -> None:
|
|
"""Begins watching source files for changes.
|
|
|
|
.. versionchanged:: 5.0
|
|
The ``io_loop`` argument (deprecated since version 4.1) has been removed.
|
|
"""
|
|
io_loop = ioloop.IOLoop.current()
|
|
if io_loop in _io_loops:
|
|
return
|
|
_io_loops[io_loop] = True
|
|
if len(_io_loops) > 1:
|
|
gen_log.warning("tornado.autoreload started more than once in the same process")
|
|
modify_times = {} # type: Dict[str, float]
|
|
callback = functools.partial(_reload_on_update, modify_times)
|
|
scheduler = ioloop.PeriodicCallback(callback, check_time)
|
|
scheduler.start()
|
|
|
|
|
|
def wait() -> None:
|
|
"""Wait for a watched file to change, then restart the process.
|
|
|
|
Intended to be used at the end of scripts like unit test runners,
|
|
to run the tests again after any source file changes (but see also
|
|
the command-line interface in `main`)
|
|
"""
|
|
io_loop = ioloop.IOLoop()
|
|
io_loop.add_callback(start)
|
|
io_loop.start()
|
|
|
|
|
|
def watch(filename: str) -> None:
|
|
"""Add a file to the watch list.
|
|
|
|
All imported modules are watched by default.
|
|
"""
|
|
_watched_files.add(filename)
|
|
|
|
|
|
def add_reload_hook(fn: Callable[[], None]) -> None:
|
|
"""Add a function to be called before reloading the process.
|
|
|
|
Note that for open file and socket handles it is generally
|
|
preferable to set the ``FD_CLOEXEC`` flag (using `fcntl` or
|
|
`os.set_inheritable`) instead of using a reload hook to close them.
|
|
"""
|
|
_reload_hooks.append(fn)
|
|
|
|
|
|
def _reload_on_update(modify_times: Dict[str, float]) -> None:
|
|
if _reload_attempted:
|
|
# We already tried to reload and it didn't work, so don't try again.
|
|
return
|
|
if process.task_id() is not None:
|
|
# We're in a child process created by fork_processes. If child
|
|
# processes restarted themselves, they'd all restart and then
|
|
# all call fork_processes again.
|
|
return
|
|
for module in list(sys.modules.values()):
|
|
# Some modules play games with sys.modules (e.g. email/__init__.py
|
|
# in the standard library), and occasionally this can cause strange
|
|
# failures in getattr. Just ignore anything that's not an ordinary
|
|
# module.
|
|
if not isinstance(module, types.ModuleType):
|
|
continue
|
|
path = getattr(module, "__file__", None)
|
|
if not path:
|
|
continue
|
|
if path.endswith(".pyc") or path.endswith(".pyo"):
|
|
path = path[:-1]
|
|
_check_file(modify_times, path)
|
|
for path in _watched_files:
|
|
_check_file(modify_times, path)
|
|
|
|
|
|
def _check_file(modify_times: Dict[str, float], path: str) -> None:
|
|
try:
|
|
modified = os.stat(path).st_mtime
|
|
except Exception:
|
|
return
|
|
if path not in modify_times:
|
|
modify_times[path] = modified
|
|
return
|
|
if modify_times[path] != modified:
|
|
gen_log.info("%s modified; restarting server", path)
|
|
_reload()
|
|
|
|
|
|
def _reload() -> None:
|
|
global _reload_attempted
|
|
_reload_attempted = True
|
|
for fn in _reload_hooks:
|
|
fn()
|
|
if sys.platform != "win32":
|
|
# Clear the alarm signal set by
|
|
# ioloop.set_blocking_log_threshold so it doesn't fire
|
|
# after the exec.
|
|
signal.setitimer(signal.ITIMER_REAL, 0, 0)
|
|
# sys.path fixes: see comments at top of file. If __main__.__spec__
|
|
# exists, we were invoked with -m and the effective path is about to
|
|
# change on re-exec. Reconstruct the original command line to
|
|
# ensure that the new process sees the same path we did. If
|
|
# __spec__ is not available (Python < 3.4), check instead if
|
|
# sys.path[0] is an empty string and add the current directory to
|
|
# $PYTHONPATH.
|
|
if _autoreload_is_main:
|
|
assert _original_argv is not None
|
|
spec = _original_spec
|
|
argv = _original_argv
|
|
else:
|
|
spec = getattr(sys.modules["__main__"], "__spec__", None)
|
|
argv = sys.argv
|
|
if spec:
|
|
argv = ["-m", spec.name] + argv[1:]
|
|
else:
|
|
path_prefix = "." + os.pathsep
|
|
if sys.path[0] == "" and not os.environ.get("PYTHONPATH", "").startswith(
|
|
path_prefix
|
|
):
|
|
os.environ["PYTHONPATH"] = path_prefix + os.environ.get("PYTHONPATH", "")
|
|
if not _has_execv:
|
|
subprocess.Popen([sys.executable] + argv)
|
|
os._exit(0)
|
|
else:
|
|
try:
|
|
os.execv(sys.executable, [sys.executable] + argv)
|
|
except OSError:
|
|
# Mac OS X versions prior to 10.6 do not support execv in
|
|
# a process that contains multiple threads. Instead of
|
|
# re-executing in the current process, start a new one
|
|
# and cause the current process to exit. This isn't
|
|
# ideal since the new process is detached from the parent
|
|
# terminal and thus cannot easily be killed with ctrl-C,
|
|
# but it's better than not being able to autoreload at
|
|
# all.
|
|
# Unfortunately the errno returned in this case does not
|
|
# appear to be consistent, so we can't easily check for
|
|
# this error specifically.
|
|
os.spawnv(
|
|
os.P_NOWAIT, sys.executable, [sys.executable] + argv # type: ignore
|
|
)
|
|
# At this point the IOLoop has been closed and finally
|
|
# blocks will experience errors if we allow the stack to
|
|
# unwind, so just exit uncleanly.
|
|
os._exit(0)
|
|
|
|
|
|
_USAGE = """\
|
|
Usage:
|
|
python -m tornado.autoreload -m module.to.run [args...]
|
|
python -m tornado.autoreload path/to/script.py [args...]
|
|
"""
|
|
|
|
|
|
def main() -> None:
|
|
"""Command-line wrapper to re-run a script whenever its source changes.
|
|
|
|
Scripts may be specified by filename or module name::
|
|
|
|
python -m tornado.autoreload -m tornado.test.runtests
|
|
python -m tornado.autoreload tornado/test/runtests.py
|
|
|
|
Running a script with this wrapper is similar to calling
|
|
`tornado.autoreload.wait` at the end of the script, but this wrapper
|
|
can catch import-time problems like syntax errors that would otherwise
|
|
prevent the script from reaching its call to `wait`.
|
|
"""
|
|
# Remember that we were launched with autoreload as main.
|
|
# The main module can be tricky; set the variables both in our globals
|
|
# (which may be __main__) and the real importable version.
|
|
import tornado.autoreload
|
|
|
|
global _autoreload_is_main
|
|
global _original_argv, _original_spec
|
|
tornado.autoreload._autoreload_is_main = _autoreload_is_main = True
|
|
original_argv = sys.argv
|
|
tornado.autoreload._original_argv = _original_argv = original_argv
|
|
original_spec = getattr(sys.modules["__main__"], "__spec__", None)
|
|
tornado.autoreload._original_spec = _original_spec = original_spec
|
|
sys.argv = sys.argv[:]
|
|
if len(sys.argv) >= 3 and sys.argv[1] == "-m":
|
|
mode = "module"
|
|
module = sys.argv[2]
|
|
del sys.argv[1:3]
|
|
elif len(sys.argv) >= 2:
|
|
mode = "script"
|
|
script = sys.argv[1]
|
|
sys.argv = sys.argv[1:]
|
|
else:
|
|
print(_USAGE, file=sys.stderr)
|
|
sys.exit(1)
|
|
|
|
try:
|
|
if mode == "module":
|
|
import runpy
|
|
|
|
runpy.run_module(module, run_name="__main__", alter_sys=True)
|
|
elif mode == "script":
|
|
with open(script) as f:
|
|
# Execute the script in our namespace instead of creating
|
|
# a new one so that something that tries to import __main__
|
|
# (e.g. the unittest module) will see names defined in the
|
|
# script instead of just those defined in this module.
|
|
global __file__
|
|
__file__ = script
|
|
# If __package__ is defined, imports may be incorrectly
|
|
# interpreted as relative to this module.
|
|
global __package__
|
|
del __package__
|
|
exec_in(f.read(), globals(), globals())
|
|
except SystemExit as e:
|
|
gen_log.info("Script exited with status %s", e.code)
|
|
except Exception as e:
|
|
gen_log.warning("Script exited with uncaught exception", exc_info=True)
|
|
# If an exception occurred at import time, the file with the error
|
|
# never made it into sys.modules and so we won't know to watch it.
|
|
# Just to make sure we've covered everything, walk the stack trace
|
|
# from the exception and watch every file.
|
|
for (filename, lineno, name, line) in traceback.extract_tb(sys.exc_info()[2]):
|
|
watch(filename)
|
|
if isinstance(e, SyntaxError):
|
|
# SyntaxErrors are special: their innermost stack frame is fake
|
|
# so extract_tb won't see it and we have to get the filename
|
|
# from the exception object.
|
|
if e.filename is not None:
|
|
watch(e.filename)
|
|
else:
|
|
gen_log.info("Script exited normally")
|
|
# restore sys.argv so subsequent executions will include autoreload
|
|
sys.argv = original_argv
|
|
|
|
if mode == "module":
|
|
# runpy did a fake import of the module as __main__, but now it's
|
|
# no longer in sys.modules. Figure out where it is and watch it.
|
|
loader = pkgutil.get_loader(module)
|
|
if loader is not None:
|
|
watch(loader.get_filename()) # type: ignore
|
|
|
|
wait()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# See also the other __main__ block at the top of the file, which modifies
|
|
# sys.path before our imports
|
|
main()
|