feat: base flask x gunicorn server

app/server.py

@@ -0,0 +1,49 @@
+import typing
+
+import flask
+import gunicorn.app.base
+
+from app import PKG_NAME
+
+if typing.TYPE_CHECKING:
+    from app.params import Parameters
+
+
+class Server(gunicorn.app.base.BaseApplication):
+    def __init__(self, params: Parameters) -> None:
+        self.env = params.env
+        self.bind = params.bind
+        self.port = params.port
+        self.debug = params.debug
+        self.workers = params.workers
+        self.timeout = params.timeout
+        self.app = flask.Flask(PKG_NAME)
+        super().__init__()
+
+    def register_routes(self) -> typing.Self:
+        @self.app.route("/")
+        def hello_world() -> str:
+            return "<p>Hello, World!</p>"
+
+        return self
+
+    @typing.override
+    def load_config(self) -> None:
+        if self.cfg is not None:
+            self.cfg.set("bind", f"{self.bind}:{self.port}")
+            self.cfg.set("workers", self.workers)
+            self.cfg.set("timeout", self.timeout)
+            self.cfg.set("logger_class", "app.logs.GunicornLogger")
+            self.cfg.set("errorlog", "-")
+            self.cfg.set("accesslog", "-")
+
+    def load(self) -> flask.Flask:
+        return self.app
+
+    def start(self) -> None:
+        if self.env == "production":
+            self.run()
+        else:
+            self.app.run(
+                host=self.bind, port=self.port, debug=self.debug, load_dotenv=False
+            )