main.py

import asyncio
import logging
import os
import platform
import ssl
import sys
import typing

import click
from h11._connection import DEFAULT_MAX_INCOMPLETE_EVENT_SIZE

import uvicorn
from uvicorn.config import (
    HTTP_PROTOCOLS,
    INTERFACES,
    LIFESPAN,
    LOG_LEVELS,
    LOGGING_CONFIG,
    LOOP_SETUPS,
    SSL_PROTOCOL_VERSION,
    WS_PROTOCOLS,
    Config,
    HTTPProtocolType,
    InterfaceType,
    LifespanType,
    LoopSetupType,
    WSProtocolType,
)
from uvicorn.server import Server, ServerState  # noqa: F401  # Used to be defined here.
from uvicorn.supervisors import ChangeReload, Multiprocess

if typing.TYPE_CHECKING:
    from asgiref.typing import ASGIApplication

LEVEL_CHOICES = click.Choice(list(LOG_LEVELS.keys()))
HTTP_CHOICES = click.Choice(list(HTTP_PROTOCOLS.keys()))
WS_CHOICES = click.Choice(list(WS_PROTOCOLS.keys()))
LIFESPAN_CHOICES = click.Choice(list(LIFESPAN.keys()))
LOOP_CHOICES = click.Choice([key for key in LOOP_SETUPS.keys() if key != "none"])
INTERFACE_CHOICES = click.Choice(INTERFACES)

STARTUP_FAILURE = 3

logger = logging.getLogger("uvicorn.error")


def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> None:
    if not value or ctx.resilient_parsing:
        return
    click.echo(
        "Running uvicorn %s with %s %s on %s"
        % (
            uvicorn.__version__,
            platform.python_implementation(),
            platform.python_version(),
            platform.system(),
        )
    )
    ctx.exit()


@click.command(context_settings={"auto_envvar_prefix": "UVICORN"})
@click.argument("app")
@click.option(
    "--host",
    type=str,
    default="127.0.0.1",
    help="Bind socket to this host.",
    show_default=True,
)
@click.option(
    "--port",
    type=int,
    default=8000,
    help="Bind socket to this port.",
    show_default=True,
)
@click.option("--uds", type=str, default=None, help="Bind to a UNIX domain socket.")
@click.option(
    "--fd", type=int, default=None, help="Bind to socket from this file descriptor."
)
@click.option("--reload", is_flag=True, default=False, help="Enable auto-reload.")
@click.option(
    "--reload-dir",
    "reload_dirs",
    multiple=True,
    help="Set reload directories explicitly, instead of using the current working"
    " directory.",
    type=click.Path(exists=True),
)
@click.option(
    "--reload-include",
    "reload_includes",
    multiple=True,
    help="Set glob patterns to include while watching for files. Includes '*.py' "
    "by default; these defaults can be overridden with `--reload-exclude`. "
    "This option has no effect unless watchfiles is installed.",
)
@click.option(
    "--reload-exclude",
    "reload_excludes",
    multiple=True,
    help="Set glob patterns to exclude while watching for files. Includes "
    "'.*, .py[cod], .sw.*, ~*' by default; these defaults can be overridden "
    "with `--reload-include`. This option has no effect unless watchfiles is "
    "installed.",
)
@click.option(
    "--reload-delay",
    type=float,
    default=0.25,
    show_default=True,
    help="Delay between previous and next check if application needs to be."
    " Defaults to 0.25s.",
)
@click.option(
    "--workers",
    default=None,
    type=int,
    help="Number of worker processes. Defaults to the $WEB_CONCURRENCY environment"
    " variable if available, or 1. Not valid with --reload.",
)
@click.option(
    "--loop",
    type=LOOP_CHOICES,
    default="auto",
    help="Event loop implementation.",
    show_default=True,
)
@click.option(
    "--http",
    type=HTTP_CHOICES,
    default="auto",
    help="HTTP protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws",
    type=WS_CHOICES,
    default="auto",
    help="WebSocket protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws-max-size",
    type=int,
    default=16777216,
    help="WebSocket max size message in bytes",
    show_default=True,
)
@click.option(
    "--ws-ping-interval",
    type=float,
    default=20.0,
    help="WebSocket ping interval",
    show_default=True,
)
@click.option(
    "--ws-ping-timeout",
    type=float,
    default=20.0,
    help="WebSocket ping timeout",
    show_default=True,
)
@click.option(
    "--ws-per-message-deflate",
    type=bool,
    default=True,
    help="WebSocket per-message-deflate compression",
    show_default=True,
)
@click.option(
    "--lifespan",
    type=LIFESPAN_CHOICES,
    default="auto",
    help="Lifespan implementation.",
    show_default=True,
)
@click.option(
    "--interface",
    type=INTERFACE_CHOICES,
    default="auto",
    help="Select ASGI3, ASGI2, or WSGI as the application interface.",
    show_default=True,
)
@click.option(
    "--env-file",
    type=click.Path(exists=True),
    default=None,
    help="Environment configuration file.",
    show_default=True,
)
@click.option(
    "--log-config",
    type=click.Path(exists=True),
    default=None,
    help="Logging configuration file. Supported formats: .ini, .json, .yaml.",
    show_default=True,
)
@click.option(
    "--log-level",
    type=LEVEL_CHOICES,
    default=None,
    help="Log level. [default: info]",
    show_default=True,
)
@click.option(
    "--access-log/--no-access-log",
    is_flag=True,
    default=True,
    help="Enable/Disable access log.",
)
@click.option(
    "--use-colors/--no-use-colors",
    is_flag=True,
    default=None,
    help="Enable/Disable colorized logging.",
)
@click.option(
    "--proxy-headers/--no-proxy-headers",
    is_flag=True,
    default=True,
    help="Enable/Disable X-Forwarded-Proto, X-Forwarded-For, X-Forwarded-Port to "
    "populate remote address info.",
)
@click.option(
    "--server-header/--no-server-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Server header.",
)
@click.option(
    "--date-header/--no-date-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Date header.",
)
@click.option(
    "--forwarded-allow-ips",
    type=str,
    default=None,
    help="Comma separated list of IPs to trust with proxy headers. Defaults to"
    " the $FORWARDED_ALLOW_IPS environment variable if available, or '127.0.0.1'.",
)
@click.option(
    "--root-path",
    type=str,
    default="",
    help="Set the ASGI 'root_path' for applications submounted below a given URL path.",
)
@click.option(
    "--limit-concurrency",
    type=int,
    default=None,
    help="Maximum number of concurrent connections or tasks to allow, before issuing"
    " HTTP 503 responses.",
)
@click.option(
    "--backlog",
    type=int,
    default=2048,
    help="Maximum number of connections to hold in backlog",
)
@click.option(
    "--limit-max-requests",
    type=int,
    default=None,
    help="Maximum number of requests to service before terminating the process.",
)
@click.option(
    "--timeout-keep-alive",
    type=int,
    default=5,
    help="Close Keep-Alive connections if no new data is received within this timeout.",
    show_default=True,
)
@click.option(
    "--ssl-keyfile", type=str, default=None, help="SSL key file", show_default=True
)
@click.option(
    "--ssl-certfile",
    type=str,
    default=None,
    help="SSL certificate file",
    show_default=True,
)
@click.option(
    "--ssl-keyfile-password",
    type=str,
    default=None,
    help="SSL keyfile password",
    show_default=True,
)
@click.option(
    "--ssl-version",
    type=int,
    default=int(SSL_PROTOCOL_VERSION),
    help="SSL version to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-cert-reqs",
    type=int,
    default=int(ssl.CERT_NONE),
    help="Whether client certificate is required (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-ca-certs",
    type=str,
    default=None,
    help="CA certificates file",
    show_default=True,
)
@click.option(
    "--ssl-ciphers",
    type=str,
    default="TLSv1",
    help="Ciphers to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--header",
    "headers",
    multiple=True,
    help="Specify custom default HTTP response headers as a Name:Value pair",
)
@click.option(
    "--version",
    is_flag=True,
    callback=print_version,
    expose_value=False,
    is_eager=True,
    help="Display the uvicorn version and exit.",
)
@click.option(
    "--app-dir",
    default=".",
    show_default=True,
    help="Look for APP in the specified directory, by adding this to the PYTHONPATH."
    " Defaults to the current working directory.",
)
@click.option(
    "--h11-max-incomplete-event-size",
    "h11_max_incomplete_event_size",
    type=int,
    default=DEFAULT_MAX_INCOMPLETE_EVENT_SIZE,
    help="For h11, the maximum number of bytes to buffer of an incomplete event.",
)
@click.option(
    "--factory",
    is_flag=True,
    default=False,
    help="Treat APP as an application factory, i.e. a () -> <ASGI app> callable.",
    show_default=True,
)
def main(
    app: str,
    host: str,
    port: int,
    uds: str,
    fd: int,
    loop: LoopSetupType,
    http: HTTPProtocolType,
    ws: WSProtocolType,
    ws_max_size: int,
    ws_ping_interval: float,
    ws_ping_timeout: float,
    ws_per_message_deflate: bool,
    lifespan: LifespanType,
    interface: InterfaceType,
    reload: bool,
    reload_dirs: typing.List[str],
    reload_includes: typing.List[str],
    reload_excludes: typing.List[str],
    reload_delay: float,
    workers: int,
    env_file: str,
    log_config: str,
    log_level: str,
    access_log: bool,
    proxy_headers: bool,
    server_header: bool,
    date_header: bool,
    forwarded_allow_ips: str,
    root_path: str,
    limit_concurrency: int,
    backlog: int,
    limit_max_requests: int,
    timeout_keep_alive: int,
    ssl_keyfile: str,
    ssl_certfile: str,
    ssl_keyfile_password: str,
    ssl_version: int,
    ssl_cert_reqs: int,
    ssl_ca_certs: str,
    ssl_ciphers: str,
    headers: typing.List[str],
    use_colors: bool,
    app_dir: str,
    h11_max_incomplete_event_size: int,
    factory: bool,
) -> None:
    run(
        app,
        host=host,
        port=port,
        uds=uds,
        fd=fd,
        loop=loop,
        http=http,
        ws=ws,
        ws_max_size=ws_max_size,
        ws_ping_interval=ws_ping_interval,
        ws_ping_timeout=ws_ping_timeout,
        ws_per_message_deflate=ws_per_message_deflate,
        lifespan=lifespan,
        env_file=env_file,
        log_config=LOGGING_CONFIG if log_config is None else log_config,
        log_level=log_level,
        access_log=access_log,
        interface=interface,
        reload=reload,
        reload_dirs=reload_dirs or None,
        reload_includes=reload_includes or None,
        reload_excludes=reload_excludes or None,
        reload_delay=reload_delay,
        workers=workers,
        proxy_headers=proxy_headers,
        server_header=server_header,
        date_header=date_header,
        forwarded_allow_ips=forwarded_allow_ips,
        root_path=root_path,
        limit_concurrency=limit_concurrency,
        backlog=backlog,
        limit_max_requests=limit_max_requests,
        timeout_keep_alive=timeout_keep_alive,
        ssl_keyfile=ssl_keyfile,
        ssl_certfile=ssl_certfile,
        ssl_keyfile_password=ssl_keyfile_password,
        ssl_version=ssl_version,
        ssl_cert_reqs=ssl_cert_reqs,
        ssl_ca_certs=ssl_ca_certs,
        ssl_ciphers=ssl_ciphers,
        headers=[header.split(":", 1) for header in headers],  # type: ignore[misc]
        use_colors=use_colors,
        factory=factory,
        app_dir=app_dir,
        h11_max_incomplete_event_size=h11_max_incomplete_event_size,
    )


def run(
    app: typing.Union["ASGIApplication", typing.Callable, str],
    *,
    host: str = "127.0.0.1",
    port: int = 8000,
    uds: typing.Optional[str] = None,
    fd: typing.Optional[int] = None,
    loop: LoopSetupType = "auto",
    http: typing.Union[typing.Type[asyncio.Protocol], HTTPProtocolType] = "auto",
    ws: typing.Union[typing.Type[asyncio.Protocol], WSProtocolType] = "auto",
    ws_max_size: int = 16777216,
    ws_ping_interval: typing.Optional[float] = 20.0,
    ws_ping_timeout: typing.Optional[float] = 20.0,
    ws_per_message_deflate: bool = True,
    lifespan: LifespanType = "auto",
    interface: InterfaceType = "auto",
    reload: bool = False,
    reload_dirs: typing.Optional[typing.Union[typing.List[str], str]] = None,
    reload_includes: typing.Optional[typing.Union[typing.List[str], str]] = None,
    reload_excludes: typing.Optional[typing.Union[typing.List[str], str]] = None,
    reload_delay: float = 0.25,
    workers: typing.Optional[int] = None,
    env_file: typing.Optional[typing.Union[str, os.PathLike]] = None,
    log_config: typing.Optional[
        typing.Union[typing.Dict[str, typing.Any], str]
    ] = LOGGING_CONFIG,
    log_level: typing.Optional[typing.Union[str, int]] = None,
    access_log: bool = True,
    proxy_headers: bool = True,
    server_header: bool = True,
    date_header: bool = True,
    forwarded_allow_ips: typing.Optional[typing.Union[typing.List[str], str]] = None,
    root_path: str = "",
    limit_concurrency: typing.Optional[int] = None,
    backlog: int = 2048,
    limit_max_requests: typing.Optional[int] = None,
    timeout_keep_alive: int = 5,
    ssl_keyfile: typing.Optional[str] = None,
    ssl_certfile: typing.Optional[typing.Union[str, os.PathLike]] = None,
    ssl_keyfile_password: typing.Optional[str] = None,
    ssl_version: int = SSL_PROTOCOL_VERSION,
    ssl_cert_reqs: int = ssl.CERT_NONE,
    ssl_ca_certs: typing.Optional[str] = None,
    ssl_ciphers: str = "TLSv1",
    headers: typing.Optional[typing.List[typing.Tuple[str, str]]] = None,
    use_colors: typing.Optional[bool] = None,
    app_dir: typing.Optional[str] = None,
    factory: bool = False,
    h11_max_incomplete_event_size: int = DEFAULT_MAX_INCOMPLETE_EVENT_SIZE,
) -> None:
    if app_dir is not None:
        sys.path.insert(0, app_dir)

    config = Config(
        app,
        host=host,
        port=port,
        uds=uds,
        fd=fd,
        loop=loop,
        http=http,
        ws=ws,
        ws_max_size=ws_max_size,
        ws_ping_interval=ws_ping_interval,
        ws_ping_timeout=ws_ping_timeout,
        ws_per_message_deflate=ws_per_message_deflate,
        lifespan=lifespan,
        interface=interface,
        reload=reload,
        reload_dirs=reload_dirs,
        reload_includes=reload_includes,
        reload_excludes=reload_excludes,
        reload_delay=reload_delay,
        workers=workers,
        env_file=env_file,
        log_config=log_config,
        log_level=log_level,
        access_log=access_log,
        proxy_headers=proxy_headers,
        server_header=server_header,
        date_header=date_header,
        forwarded_allow_ips=forwarded_allow_ips,
        root_path=root_path,
        limit_concurrency=limit_concurrency,
        backlog=backlog,
        limit_max_requests=limit_max_requests,
        timeout_keep_alive=timeout_keep_alive,
        ssl_keyfile=ssl_keyfile,
        ssl_certfile=ssl_certfile,
        ssl_keyfile_password=ssl_keyfile_password,
        ssl_version=ssl_version,
        ssl_cert_reqs=ssl_cert_reqs,
        ssl_ca_certs=ssl_ca_certs,
        ssl_ciphers=ssl_ciphers,
        headers=headers,
        use_colors=use_colors,
        factory=factory,
        h11_max_incomplete_event_size=h11_max_incomplete_event_size,
    )
    server = Server(config=config)

    if (config.reload or config.workers > 1) and not isinstance(app, str):
        logger = logging.getLogger("uvicorn.error")
        logger.warning(
            "You must pass the application as an import string to enable 'reload' or "
            "'workers'."
        )
        sys.exit(1)

    if config.should_reload:
        sock = config.bind_socket()
        ChangeReload(config, target=server.run, sockets=[sock]).run()
    elif config.workers > 1:
        sock = config.bind_socket()
        Multiprocess(config, target=server.run, sockets=[sock]).run()
    else:
        server.run()
    if config.uds and os.path.exists(config.uds):
        os.remove(config.uds)  # pragma: py-win32

    if not server.started and not config.should_reload and config.workers == 1:
        sys.exit(STARTUP_FAILURE)


if __name__ == "__main__":
    main()  # pragma: no cover