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core.py
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core.py
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from __future__ import annotations
import inspect
import multiprocessing
import os
import subprocess
import sys
from typing import TYPE_CHECKING, Any
from rich.tree import Tree
from litestar.cli._utils import (
RICH_CLICK_INSTALLED,
UVICORN_INSTALLED,
LitestarEnv,
console,
create_ssl_files,
show_app_info,
validate_ssl_file_paths,
)
from litestar.routes import HTTPRoute, WebSocketRoute
from litestar.utils.helpers import unwrap_partial
if UVICORN_INSTALLED:
import uvicorn
if TYPE_CHECKING or not RICH_CLICK_INSTALLED: # pragma: no cover
import click
from click import Context, command, option
else:
import rich_click as click
from rich_click import Context, command, option
__all__ = ("info_command", "routes_command", "run_command")
if TYPE_CHECKING:
from litestar import Litestar
def _convert_uvicorn_args(args: dict[str, Any]) -> list[str]:
process_args = []
for arg, value in args.items():
if isinstance(value, bool):
if value:
process_args.append(f"--{arg}")
elif isinstance(value, tuple):
process_args.extend(f"--{arg}={item}" for item in value)
else:
process_args.append(f"--{arg}={value}")
return process_args
def _run_uvicorn_in_subprocess(
*,
env: LitestarEnv,
host: str | None,
port: int | None,
workers: int | None,
reload: bool,
reload_dirs: tuple[str, ...] | None,
fd: int | None,
uds: str | None,
certfile_path: str | None,
keyfile_path: str | None,
) -> None:
process_args: dict[str, Any] = {
"reload": reload,
"host": host,
"port": port,
"workers": workers,
"factory": env.is_app_factory,
}
if fd is not None:
process_args["fd"] = fd
if uds is not None:
process_args["uds"] = uds
if reload_dirs:
process_args["reload-dir"] = reload_dirs
if certfile_path is not None:
process_args["ssl-certfile"] = certfile_path
if keyfile_path is not None:
process_args["ssl-keyfile"] = keyfile_path
subprocess.run(
[sys.executable, "-m", "uvicorn", env.app_path, *_convert_uvicorn_args(process_args)], # noqa: S603
check=True,
)
@command(name="version")
@option("-s", "--short", help="Exclude release level and serial information", is_flag=True, default=False)
def version_command(short: bool) -> None:
"""Show the currently installed Litestar version."""
from litestar import __version__
click.echo(__version__.formatted(short=short))
@command(name="info")
def info_command(app: Litestar) -> None:
"""Show information about the detected Litestar app."""
show_app_info(app)
@command(name="run")
@option("-r", "--reload", help="Reload server on changes", default=False, is_flag=True)
@option("-R", "--reload-dir", help="Directories to watch for file changes", multiple=True)
@option("-p", "--port", help="Serve under this port", type=int, default=8000, show_default=True)
@option(
"-W",
"--wc",
"--web-concurrency",
help="The number of HTTP workers to launch",
type=click.IntRange(min=1, max=multiprocessing.cpu_count() + 1),
show_default=True,
default=1,
)
@option("-H", "--host", help="Server under this host", default="127.0.0.1", show_default=True)
@option(
"-F",
"--fd",
"--file-descriptor",
help="Bind to a socket from this file descriptor.",
type=int,
default=None,
show_default=True,
)
@option("-U", "--uds", "--unix-domain-socket", help="Bind to a UNIX domain socket.", default=None, show_default=True)
@option("-d", "--debug", help="Run app in debug mode", is_flag=True)
@option("-P", "--pdb", "--use-pdb", help="Drop into PDB on an exception", is_flag=True)
@option("--ssl-certfile", help="Location of the SSL cert file", default=None)
@option("--ssl-keyfile", help="Location of the SSL key file", default=None)
@option(
"--create-self-signed-cert",
help="If certificate and key are not found at specified locations, create a self-signed certificate and a key",
is_flag=True,
)
def run_command(
reload: bool,
port: int,
wc: int,
host: str,
fd: int | None,
uds: str | None,
debug: bool,
reload_dir: tuple[str, ...],
pdb: bool,
ssl_certfile: str | None,
ssl_keyfile: str | None,
create_self_signed_cert: bool,
ctx: Context,
) -> None:
"""Run a Litestar app; requires ``uvicorn``.
The app can be either passed as a module path in the form of <module name>.<submodule>:<app instance or factory>,
set as an environment variable LITESTAR_APP with the same format or automatically discovered from one of these
canonical paths: app.py, asgi.py, application.py or app/__init__.py. When auto-discovering application factories,
functions with the name ``create_app`` are considered, or functions that are annotated as returning a ``Litestar``
instance.
"""
if debug:
os.environ["LITESTAR_DEBUG"] = "1"
if pdb:
os.environ["LITESTAR_PDB"] = "1"
if not UVICORN_INSTALLED:
console.print(
r"uvicorn is not installed. Please install the standard group, litestar\[standard], to use this command."
)
sys.exit(1)
if callable(ctx.obj):
ctx.obj = ctx.obj()
else:
if debug:
ctx.obj.app.debug = True
if pdb:
ctx.obj.app.pdb_on_exception = True
env: LitestarEnv = ctx.obj
app = env.app
reload_dirs = env.reload_dirs or reload_dir
host = env.host or host
port = env.port if env.port is not None else port
fd = env.fd if env.fd is not None else fd
uds = env.uds or uds
reload = env.reload or reload or bool(reload_dirs)
workers = env.web_concurrency or wc
ssl_certfile = ssl_certfile or env.certfile_path
ssl_keyfile = ssl_keyfile or env.keyfile_path
create_self_signed_cert = create_self_signed_cert or env.create_self_signed_cert
certfile_path, keyfile_path = (
create_ssl_files(ssl_certfile, ssl_keyfile, host)
if create_self_signed_cert
else validate_ssl_file_paths(ssl_certfile, ssl_keyfile)
)
console.rule("[yellow]Starting server process", align="left")
show_app_info(app)
if workers == 1 and not reload:
# A guard statement at the beginning of this function prevents uvicorn from being unbound
# See "reportUnboundVariable in:
# https://microsoft.github.io/pyright/#/configuration?id=type-check-diagnostics-settings
uvicorn.run( # pyright: ignore
app=env.app_path,
host=host,
port=port,
fd=fd,
uds=uds,
factory=env.is_app_factory,
ssl_certfile=certfile_path,
ssl_keyfile=keyfile_path,
)
else:
# invoke uvicorn in a subprocess to be able to use the --reload flag. see
# https://github.com/litestar-org/litestar/issues/1191 and https://github.com/encode/uvicorn/issues/1045
if sys.gettrace() is not None:
console.print(
"[yellow]Debugger detected. Breakpoints might not work correctly inside route handlers when running"
" with the --reload or --workers options[/]"
)
_run_uvicorn_in_subprocess(
env=env,
host=host,
port=port,
workers=workers,
reload=reload,
reload_dirs=reload_dirs,
fd=fd,
uds=uds,
certfile_path=certfile_path,
keyfile_path=keyfile_path,
)
@command(name="routes")
def routes_command(app: Litestar) -> None: # pragma: no cover
"""Display information about the application's routes."""
tree = Tree("", hide_root=True)
for route in sorted(app.routes, key=lambda r: r.path):
if isinstance(route, HTTPRoute):
branch = tree.add(f"[green]{route.path}[/green] (HTTP)")
for handler in route.route_handlers:
handler_info = [
f"[blue]{handler.name or handler.handler_name}[/blue]",
]
if inspect.iscoroutinefunction(unwrap_partial(handler.fn.value)):
handler_info.append("[magenta]async[/magenta]")
else:
handler_info.append("[yellow]sync[/yellow]")
handler_info.append(f'[cyan]{", ".join(sorted(handler.http_methods))}[/cyan]')
if len(handler.paths) > 1:
for path in handler.paths:
branch.add(" ".join([f"[green]{path}[green]", *handler_info]))
else:
branch.add(" ".join(handler_info))
else:
route_type = "WS" if isinstance(route, WebSocketRoute) else "ASGI"
branch = tree.add(f"[green]{route.path}[/green] ({route_type})")
branch.add(f"[blue]{route.route_handler.name or route.route_handler.handler_name}[/blue]")
console.print(tree)