fix: #1874 support workers for ASGI FastStream

Author: sehat1137

docs/docs/en/getting-started/asgi.md

@@ -38,6 +38,22 @@ uvicorn main:app
 
 It does nothing but launch the app itself as an **ASGI lifespan**.
 
+!!! note
+    If you want to run your app using several workers, you need to use something else than `uvicorn`.
+    ```shell
+    faststream run main:app --workers 4
+    ```
+    ```shell
+    gunicorn -k uvicorn.workers.UvicornWorker main:app --workers=4 
+    ```
+    ```shell
+    granian --interface asgi main:app --workers 4
+    ```
+    ```shell
+    hypercorn main:app --workers 4
+    ```
+
+
 ### ASGI Routes
 
 It doesn't look very helpful, so let's add some **HTTP** endpoints.
@@ -137,6 +153,8 @@ app = FastStream(broker).as_asgi(
     ```shell
     faststream run main:app --host 0.0.0.0 --port 8000 --workers 4
     ```
+    This possibility builded on gunicorn + uvicorn, you need install them to run FastStream ASGI app via CLI.
+    We send all args directly to gunicorn, you can learn more about it [here](https://github.com/benoitc/gunicorn/blob/master/examples/example_config.py).
 
 ## Other ASGI Compatibility
 
@@ -166,3 +184,17 @@ app = FastAPI(lifespan=start_broker)
 app.mount("/health", make_ping_asgi(broker, timeout=5.0))
 app.mount("/asyncapi", make_asyncapi_asgi(FastStream(broker)))
 ```
+
+!!! tip
+    You can also bind to unix domain or a file descriptor. FastStream will bind to “127.0.0.1:8000” by default 
+    
+    ```shell
+    faststream run main:app --bind unix:/tmp/socket.sock
+    ```
+    ```shell
+    faststream run main:app --bind fd://2
+    ```
+    You can use multiple binds if you want
+    ```shell
+    faststream run main:app --bind 0.0.0.0:8000 '[::]:8000'
+    ```

faststream/asgi/app.py

@@ -10,6 +10,7 @@
     Sequence,
     Tuple,
     Union,
+    List,
 )
 
 import anyio
@@ -20,6 +21,17 @@
 from faststream.asgi.websocket import WebSocketClose
 from faststream.log.logging import logger
 
+try:
+    from gunicorn.app.base import BaseApplication
+except ImportError:
+    BaseApplication = None
+
+try:
+    import uvicorn
+except ImportError:
+    uvicorn = None  # type: ignore
+
+
 if TYPE_CHECKING:
     from faststream.asgi.types import ASGIApp, Receive, Scope, Send
     from faststream.asyncapi.schema import (
@@ -43,6 +55,23 @@
     )
 
 
+class ASGIRunner(BaseApplication):  # type: ignore
+    def __init__(self, asgi_app: "ASGIApp", options: Dict[str, Any]):
+        self.options = options
+        self.asgi_app = asgi_app
+        super().__init__()
+
+    def load_config(self) -> None:
+        for k, v in self.options.items():
+            if k in self.cfg.settings and v is not None:
+                self.cfg.set(k.lower(), v)
+            else:
+                logger.warn(f"Unknown config variable: {k} with value {v}")
+
+    def load(self) -> "ASGIApp":
+        return self.asgi_app
+
+
 class AsgiFastStream(Application):
     def __init__(
         self,
@@ -146,25 +175,34 @@ async def run(
         run_extra_options: Optional[Dict[str, "SettingField"]] = None,
         sleep_time: float = 0.1,
     ) -> None:
-        import uvicorn
-
-        if not run_extra_options:
-            run_extra_options = {}
-        port = int(run_extra_options.pop("port", 8000))  # type: ignore[arg-type]
-        workers = int(run_extra_options.pop("workers", 1))  # type: ignore[arg-type]
-        host = str(run_extra_options.pop("host", "localhost"))
-        fd = int(run_extra_options.pop("fd", -1))  # type: ignore[arg-type]
-        config = uvicorn.Config(
-            self,
-            host=host,
-            port=port,
-            log_level=log_level,
-            workers=workers,
-            fd=fd if fd != -1 else None,
-            **run_extra_options,
-        )
-        server = uvicorn.Server(config)
-        await server.serve()
+        if not all([uvicorn, BaseApplication]):
+            raise RuntimeError(
+                "You need uvicorn and gunicorn to run FastStream ASGI App via CLI"
+            )
+
+        run_extra_options = run_extra_options or {}
+
+        bindings: List[str] = []
+        host = run_extra_options.pop("host", None)
+        port = run_extra_options.pop("port", None)
+        if host is not None and port is not None:
+            bindings.append(f"{host}:{port}")
+        elif host is not None:
+            bindings.append(f"{host}:8000")
+        elif port is not None:
+            bindings.append(f"127.0.0.1:{port}")
+
+        bind = run_extra_options.get("bind")
+        if isinstance(bind, list):
+            bindings.extend(bind)  # type: ignore
+        elif isinstance(bind, str):
+            bindings.append(bind)
+
+        run_extra_options["bind"] = bindings or "127.0.0.1:8000"
+        #  We use gunicorn with uvicorn workers because uvicorn don't support multiple workers
+        run_extra_options["worker_class"] = "uvicorn.workers.UvicornWorker"
+
+        ASGIRunner(self, run_extra_options).run()
 
     @asynccontextmanager
     async def start_lifespan_context(self) -> AsyncIterator[None]:

faststream/cli/utils/parser.py

@@ -1,9 +1,12 @@
+import re
 from functools import reduce
 from typing import TYPE_CHECKING, Dict, List, Tuple
 
 if TYPE_CHECKING:
     from faststream.types import SettingField
 
+APP_REGEX = re.compile(r"[a-zA-Z]+:[a-zA-Z]+")
+
 
 def parse_cli_args(*args: str) -> Tuple[str, Dict[str, "SettingField"]]:
     """Parses command line arguments."""
@@ -22,7 +25,7 @@ def parse_cli_args(*args: str) -> Tuple[str, Dict[str, "SettingField"]]:
         ),
         "-",
     ]:
-        if ":" in item:
+        if re.match(APP_REGEX, item):
             app = item
 
         else:

tests/cli/utils/test_parser.py

@@ -23,19 +23,20 @@
 )
 ARG6 = ("--some-key",)
 ARG7 = ("--k7", "1", "2", "--k7", "3")
+ARG8 = ("--bind", "[::]:8000", "0.0.0.0:8000", "fd://2")
 
 
 @pytest.mark.parametrize(
     "args",
     (  # noqa: PT007
-        (APPLICATION, *ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7),
-        (*ARG1, APPLICATION, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7),
-        (*ARG1, *ARG2, APPLICATION, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7),
-        (*ARG1, *ARG2, *ARG3, APPLICATION, *ARG4, *ARG5, *ARG6, *ARG7),
-        (*ARG1, *ARG2, *ARG3, *ARG4, APPLICATION, *ARG5, *ARG6, *ARG7),
-        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, APPLICATION, *ARG6, *ARG7),
-        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, APPLICATION, *ARG7),
-        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7, APPLICATION),
+        (APPLICATION, *ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7, *ARG8),
+        (*ARG1, APPLICATION, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7, *ARG8),
+        (*ARG1, *ARG2, APPLICATION, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7, *ARG8),
+        (*ARG1, *ARG2, *ARG3, APPLICATION, *ARG4, *ARG5, *ARG6, *ARG7, *ARG8),
+        (*ARG1, *ARG2, *ARG3, *ARG4, APPLICATION, *ARG5, *ARG6, *ARG7, *ARG8),
+        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, APPLICATION, *ARG6, *ARG7, *ARG8),
+        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, APPLICATION, *ARG7, *ARG8),
+        (*ARG1, *ARG2, *ARG3, *ARG4, *ARG5, *ARG6, *ARG7, *ARG8, APPLICATION),
     ),
 )
 def test_custom_argument_parsing(args: Tuple[str]):
@@ -49,4 +50,5 @@ def test_custom_argument_parsing(args: Tuple[str]):
         "k5": ["1", "1"],
         "some_key": True,
         "k7": ["1", "2", "3"],
+        "bind": ["[::]:8000", "0.0.0.0:8000", "fd://2"],
     }