✨ Path params component (#171)

flama/__init__.py

@@ -1,8 +1,6 @@
 from flama.applications import *  # noqa
 from flama.background import *  # noqa
 from flama.cli import *  # noqa
-from flama.endpoints import *  # noqa
-from flama.injection.components import Component  # noqa
-from flama.modules import Module  # noqa
-from flama.routing import *  # noqa
+from flama.injection.components import *  # noqa
+from flama.modules import *  # noqa
 from flama.serialize import *  # noqa

flama/applications.py

@@ -3,15 +3,14 @@
 import threading
 import typing as t
 
-from flama import asgi, exceptions, http, injection, types, url, validation, websockets
+from flama import asgi, exceptions, http, injection, routing, types, url, validation, websockets
 from flama.ddd.components import WorkerComponent
 from flama.events import Events
 from flama.middleware import MiddlewareStack
 from flama.models.modules import ModelsModule
 from flama.modules import Modules
 from flama.pagination import paginator
 from flama.resources import ResourcesModule
-from flama.routing import BaseRoute, Router
 from flama.schemas.modules import SchemaModule
 
 try:
@@ -23,7 +22,6 @@
     from flama.middleware import Middleware
     from flama.modules import Module
     from flama.pagination.types import PaginationType
-    from flama.routing import Mount, Route, WebSocketRoute
 
 __all__ = ["Flama"]
 
@@ -33,7 +31,7 @@
 class Flama:
     def __init__(
         self,
-        routes: t.Optional[t.Sequence[t.Union["BaseRoute", "Mount"]]] = None,
+        routes: t.Optional[t.Sequence["routing.BaseRoute"]] = None,
         components: t.Optional[t.Union[t.Sequence[injection.Component], set[injection.Component]]] = None,
         modules: t.Optional[t.Union[t.Sequence["Module"], set["Module"]]] = None,
         middleware: t.Optional[t.Sequence["Middleware"]] = None,
@@ -75,8 +73,7 @@ def __init__(
                 "send": types.Send,
                 "exc": Exception,
                 "app": Flama,
-                "path_params": types.PathParams,
-                "route": BaseRoute,
+                "route": routing.BaseRoute,
                 "request": http.Request,
                 "response": http.Response,
                 "websocket": websockets.WebSocket,
@@ -102,7 +99,7 @@ def __init__(
         self.modules = Modules(app=self, modules={*default_modules, *(modules or [])})
 
         # Initialize router
-        self.app = self.router = Router(
+        self.app = self.router = routing.Router(
             routes=routes, components=[*default_components, *(components or [])], lifespan=lifespan
         )
 
@@ -144,11 +141,12 @@ async def __call__(self, scope: types.Scope, receive: types.Receive, send: types
         :param receive: ASGI receive event.
         :param send: ASGI send event.
         """
-        if scope["type"] != "lifespan" and self.status in (types.AppStatus.NOT_STARTED, types.AppStatus.STARTING):
-            raise exceptions.ApplicationError("Application is not ready to process requests yet.")
+        if scope["type"] != "lifespan":
+            if self.status in (types.AppStatus.NOT_STARTED, types.AppStatus.STARTING):
+                raise exceptions.ApplicationError("Application is not ready to process requests yet.")
 
-        if scope["type"] != "lifespan" and self.status in (types.AppStatus.SHUT_DOWN, types.AppStatus.SHUTTING_DOWN):
-            raise exceptions.ApplicationError("Application is already shut down.")
+            elif self.status in (types.AppStatus.SHUT_DOWN, types.AppStatus.SHUTTING_DOWN):
+                raise exceptions.ApplicationError("Application is already shut down.")
 
         scope["app"] = self
         scope.setdefault("root_app", self)
@@ -182,7 +180,7 @@ def add_component(self, component: injection.Component):
         self.router.build(self)
 
     @property
-    def routes(self) -> list["BaseRoute"]:
+    def routes(self) -> list["routing.BaseRoute"]:
         """List of registered routes.
 
         :return: Routes.
@@ -196,10 +194,10 @@ def add_route(
         methods: t.Optional[list[str]] = None,
         name: t.Optional[str] = None,
         include_in_schema: bool = True,
-        route: t.Optional["Route"] = None,
+        route: t.Optional["routing.Route"] = None,
         pagination: t.Optional[t.Union[str, "PaginationType"]] = None,
         tags: t.Optional[dict[str, t.Any]] = None,
-    ) -> "Route":
+    ) -> "routing.Route":
         """Register a new HTTP route or endpoint under given path.
 
         :param path: URL path.
@@ -257,10 +255,10 @@ def add_websocket_route(
         path: t.Optional[str] = None,
         endpoint: t.Optional[types.WebSocketHandler] = None,
         name: t.Optional[str] = None,
-        route: t.Optional["WebSocketRoute"] = None,
+        route: t.Optional["routing.WebSocketRoute"] = None,
         pagination: t.Optional[t.Union[str, "PaginationType"]] = None,
         tags: t.Optional[dict[str, t.Any]] = None,
-    ) -> "WebSocketRoute":
+    ) -> "routing.WebSocketRoute":
         """Register a new websocket route or endpoint under given path.
 
         :param path: URL path.
@@ -296,9 +294,9 @@ def mount(
         path: t.Optional[str] = None,
         app: t.Optional[types.App] = None,
         name: t.Optional[str] = None,
-        mount: t.Optional["Mount"] = None,
+        mount: t.Optional["routing.Mount"] = None,
         tags: t.Optional[dict[str, t.Any]] = None,
-    ) -> "Mount":
+    ) -> "routing.Mount":
         """Register a new mount point containing an ASGI app in this router under given path.
 
         :param path: URL path.
@@ -366,7 +364,7 @@ def resolve_url(self, name: str, **path_params: t.Any) -> url.URL:
         """
         return self.router.resolve_url(name, **path_params)
 
-    def resolve_route(self, scope: types.Scope) -> tuple[BaseRoute, types.Scope]:
+    def resolve_route(self, scope: types.Scope) -> tuple[routing.BaseRoute, types.Scope]:
         """Look for a route that matches given ASGI scope.
 
         :param scope: ASGI scope.

flama/asgi.py

@@ -1,7 +1,7 @@
 from http.cookies import SimpleCookie
 from urllib.parse import parse_qsl
 
-from flama import http, types
+from flama import http, routing, types
 from flama.injection.components import Component, Components
 
 __all__ = [
@@ -11,6 +11,7 @@
     "HostComponent",
     "PortComponent",
     "PathComponent",
+    "PathParamsComponent",
     "QueryStringComponent",
     "QueryParamsComponent",
     "HeadersComponent",
@@ -60,7 +61,12 @@ def resolve(self, scope: types.Scope) -> types.Port:
 
 class PathComponent(Component):
     def resolve(self, scope: types.Scope) -> types.Path:
-        return types.Path(scope.get("root_path", "") + scope["path"])
+        return types.Path(scope.get("root_path", "")) / types.Path(scope["path"])
+
+
+class PathParamsComponent(Component):
+    def resolve(self, scope: types.Scope, route: routing.BaseRoute) -> types.PathParams:
+        return types.PathParams(route.path.match(scope["path"]).parameters or {})
 
 
 class QueryStringComponent(Component):
@@ -69,9 +75,8 @@ def resolve(self, scope: types.Scope) -> types.QueryString:
 
 
 class QueryParamsComponent(Component):
-    def resolve(self, scope: types.Scope) -> types.QueryParams:
-        query_string = scope["query_string"].decode()
-        return types.QueryParams(parse_qsl(query_string))
+    def resolve(self, query: types.QueryString) -> types.QueryParams:
+        return types.QueryParams(parse_qsl(query))
 
 
 class HeadersComponent(Component):
@@ -113,6 +118,7 @@ async def resolve(self, receive: types.Receive) -> types.Body:
         HostComponent(),
         PortComponent(),
         PathComponent(),
+        PathParamsComponent(),
         QueryStringComponent(),
         QueryParamsComponent(),
         HeadersComponent(),

flama/endpoints/__init__.py

@@ -0,0 +1,3 @@
+from flama.endpoints.base import *  # noqa
+from flama.endpoints.http import *  # noqa
+from flama.endpoints.websocket import *  # noqa

flama/endpoints/base.py

@@ -0,0 +1,32 @@
+import typing as t
+
+from flama import types
+
+__all__ = ["BaseEndpoint"]
+
+
+class BaseEndpoint(types.EndpointProtocol):
+    def __init__(self, scope: "types.Scope", receive: "types.Receive", send: "types.Send") -> None:
+        """An endpoint.
+
+        :param scope: ASGI scope.
+        :param receive: ASGI receive function.
+        :param send: ASGI send function.
+        """
+        app = scope["app"]
+        scope["path"] = scope.get("root_path", "").rstrip("/") + scope["path"]
+        scope["root_path"] = ""
+        route, route_scope = app.router.resolve_route(scope)
+        self.state = {
+            "scope": route_scope,
+            "receive": receive,
+            "send": send,
+            "exc": None,
+            "app": app,
+            "root_app": scope["root_app"],
+            "path_params": route_scope.get("path_params", {}),
+            "route": route,
+        }
+
+    def __await__(self) -> t.Generator:
+        return self.dispatch().__await__()