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"""Module to dynamically generate a Starlette routing map based on a directory tree."""
import importlib
import inspect
import typing as t
from pathlib import Path
from nested_dict import nested_dict
from starlette.routing import BaseRoute, Mount, Route as StarletteRoute
from backend.route import Route
def construct_route_map_from_dict(route_dict: dict) -> list[BaseRoute]:
route_map = []
for mount, item in route_dict.items():
if inspect.isclass(item):
route_map.append(StarletteRoute(mount, item))
else:
route_map.append(Mount(mount, routes=construct_route_map_from_dict(item)))
# Order non-capturing routes before capturing routes
route_map.sort(key=lambda route: "{" in route.path)
return route_map
def is_route_class(member: t.Any) -> bool:
return inspect.isclass(member) and issubclass(member, Route) and member != Route
def route_classes() -> t.Iterator[tuple[Path, type[Route]]]:
routes_directory = Path("backend") / "routes"
for module_path in routes_directory.rglob("*.py"):
import_name = f"{".".join(module_path.parent.parts)}.{module_path.stem}"
route_module = importlib.import_module(import_name)
for _member_name, member in inspect.getmembers(route_module):
if is_route_class(member):
member.check_parameters()
yield (module_path, member)
def create_route_map() -> list[BaseRoute]:
route_dict = nested_dict()
for module_path, member in route_classes():
# For Path: "backend/routes/foo/bar/baz/bin.py"
# => levels == ["foo", "bar", "baz"]
levels = module_path.parent.parts[2:]
current_level = None
for level in levels:
if current_level is None:
current_level = route_dict[f"/{level}"]
else:
current_level = current_level[f"/{level}"]
if current_level is not None:
current_level[member.path] = member
else:
route_dict[member.path] = member
return construct_route_map_from_dict(route_dict.to_dict())
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