Restructure of CLI and application state (#2295)

* Initial work on restructure of application state

* Updated MOTD with more flexible input and add basic version

* Remove unnecessary type ignores

* Add wrapping and smarter output per process type

* Add support for ASGI MOTD

* Add Windows color support ernable

* Refactor __main__ into submodule

* Renest arguments

* Passing unit tests

* Passing unit tests

* Typing

* Fix num worker test

* Add context to assert failure

* Add some type annotations

* Some linting

* Line aware searching in test

* Test abstractions

* Fix some flappy tests

* Bump up timeout on CLI tests

* Change test for no access logs on gunicornworker

* Add some basic test converage

* Some new tests, and disallow workers and fast on app.run

sanic/application/state.py

@@ -0,0 +1,72 @@
+from __future__ import annotations
+
+import logging
+
+from dataclasses import dataclass, field
+from enum import Enum, auto
+from pathlib import Path
+from typing import TYPE_CHECKING, Any, Set, Union
+
+from sanic.log import logger
+
+
+if TYPE_CHECKING:
+    from sanic import Sanic
+
+
+class StrEnum(str, Enum):
+    def _generate_next_value_(name: str, *args) -> str:  # type: ignore
+        return name.lower()
+
+
+class Server(StrEnum):
+    SANIC = auto()
+    ASGI = auto()
+    GUNICORN = auto()
+
+
+class Mode(StrEnum):
+    PRODUCTION = auto()
+    DEBUG = auto()
+
+
+@dataclass
+class ApplicationState:
+    app: Sanic
+    asgi: bool = field(default=False)
+    fast: bool = field(default=False)
+    host: str = field(default="")
+    mode: Mode = field(default=Mode.PRODUCTION)
+    port: int = field(default=0)
+    reload_dirs: Set[Path] = field(default_factory=set)
+    server: Server = field(default=Server.SANIC)
+    is_running: bool = field(default=False)
+    is_stopping: bool = field(default=False)
+    verbosity: int = field(default=0)
+    workers: int = field(default=0)
+
+    # This property relates to the ApplicationState instance and should
+    # not be changed except in the __post_init__ method
+    _init: bool = field(default=False)
+
+    def __post_init__(self) -> None:
+        self._init = True
+
+    def __setattr__(self, name: str, value: Any) -> None:
+        if self._init and name == "_init":
+            raise RuntimeError(
+                "Cannot change the value of _init after instantiation"
+            )
+        super().__setattr__(name, value)
+        if self._init and hasattr(self, f"set_{name}"):
+            getattr(self, f"set_{name}")(value)
+
+    def set_mode(self, value: Union[str, Mode]):
+        if hasattr(self.app, "error_handler"):
+            self.app.error_handler.debug = self.app.debug
+        if getattr(self.app, "configure_logging", False) and self.app.debug:
+            logger.setLevel(logging.DEBUG)
+
+    @property
+    def is_debug(self):
+        return self.mode is Mode.DEBUG