Implement ASGI application with fibonacci, factorial, and mean endpoints

hw1/app.py

@@ -12,7 +12,93 @@ async def application(
         receive: Корутина для получения сообщений от клиента
         send: Корутина для отправки сообщений клиенту
     """
-    # TODO: Ваша реализация здесь
+    if scope["type"] == "lifespan":
+        while True:
+            message = await receive()
+            await send({"type": f"{message['type']}.complete"})
+
+    path = scope["path"].rstrip("/")
+    status = 404
+    result = None
+
+    if scope["method"] == "GET":
+        if path == "/factorial":
+            kvs = scope["query_string"].decode()
+            n = None
+            for kv in kvs.split("&"):
+                if "=" in kv:
+                    k, v = kv.split("=", 1)
+                    if k == "n":
+                        n = v
+            status, result = compute_number(n, factorial)
+        elif path.startswith("/fibonacci/"):
+            status, result = compute_number(path.removeprefix("/fibonacci/"), fibonacci)
+        elif path == "/mean":
+            raw_bytes = await read_bytes(receive)
+            status, result = mean(raw_bytes)
+
+    await answer(send, status, result)
+
+
+def compute_number(raw: str | None, func: Callable[[int], int]) -> tuple[int, int | None]:
+    try:
+        n = int(raw)
+    except (TypeError, ValueError):
+        return 422, None
+    if n < 0:
+        return 400, None
+    return 200, func(n)
+
+
+def factorial(n: int) -> int:
+    ans = 1
+    for i in range(n):
+        ans *= (i + 1)
+    return ans
+
+
+def fibonacci(n: int) -> int:
+    a, b = 0, 1
+    for _ in range(n):
+        a, b = b, a + b
+    return a
+
+
+def mean(body: bytes) -> tuple[int, float | None]:
+    try:
+        text = body.decode().strip()
+        numbers = [float(item) for item in text[1:-1].split(",") if item.strip()]
+    except ValueError:
+        return 422, None
+    if not numbers:
+        return 400, None
+    res = sum(numbers) / len(numbers)
+    return 200, res
+
+
+async def read_bytes(receive: Callable[[], Awaitable[dict[str, Any]]]) -> bytes:
+    body = b""
+    has_more = True
+    while has_more:
+        message = await receive()
+        body += message.get("body", b"")
+        has_more = message.get("more_body", False)
+    return body
+
+
+async def answer(send, status, result):
+    await send(
+        {
+            "type": "http.response.start",
+            "status": status,
+            "headers": [[b"content-type", b"application/json"]],
+        }
+    )
+    body = b""
+    if status == 200:
+        body = f'{{"result": {result}}}'.encode()
+    await send({"type": "http.response.body", "body": body})
+
 
 if __name__ == "__main__":
     import uvicorn

hw2/grpc_example/ping_pb2.pyi

@@ -0,0 +1,17 @@
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Optional as _Optional
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class PingRequest(_message.Message):
+    __slots__ = ("message",)
+    MESSAGE_FIELD_NUMBER: _ClassVar[int]
+    message: str
+    def __init__(self, message: _Optional[str] = ...) -> None: ...
+
+class PongResponse(_message.Message):
+    __slots__ = ("message",)
+    MESSAGE_FIELD_NUMBER: _ClassVar[int]
+    message: str
+    def __init__(self, message: _Optional[str] = ...) -> None: ...

hw2/grpc_example/ping_pb2_grpc.py

@@ -0,0 +1,140 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+import warnings
+
+import ping_pb2 as ping__pb2
+
+GRPC_GENERATED_VERSION = '1.84.0'
+GRPC_VERSION = grpc.__version__
+_version_not_supported = False
+
+try:
+    from grpc._utilities import first_version_is_lower
+    _version_not_supported = first_version_is_lower(GRPC_VERSION, GRPC_GENERATED_VERSION)
+except ImportError:
+    _version_not_supported = True
+
+if _version_not_supported:
+    raise RuntimeError(
+        f'The grpc package installed is at version {GRPC_VERSION},'
+        + ' but the generated code in ping_pb2_grpc.py depends on'
+        + f' grpcio>={GRPC_GENERATED_VERSION}.'
+        + f' Please upgrade your grpc module to grpcio>={GRPC_GENERATED_VERSION}'
+        + f' or downgrade your generated code using grpcio-tools<={GRPC_VERSION}.'
+    )
+
+
+class ExampleStub:
+    """Missing associated documentation comment in .proto file."""
+
+    def __init__(self, channel):
+        """Constructor.
+
+        Args:
+            channel: A grpc.Channel.
+        """
+        self.Ping = channel.unary_unary(
+                '/example.Example/Ping',
+                request_serializer=ping__pb2.PingRequest.SerializeToString,
+                response_deserializer=ping__pb2.PongResponse.FromString,
+                _registered_method=True)
+        self.PingStream = channel.stream_stream(
+                '/example.Example/PingStream',
+                request_serializer=ping__pb2.PingRequest.SerializeToString,
+                response_deserializer=ping__pb2.PongResponse.FromString,
+                _registered_method=True)
+
+
+class ExampleServicer:
+    """Missing associated documentation comment in .proto file."""
+
+    def Ping(self, request, context):
+        """Missing associated documentation comment in .proto file."""
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+    def PingStream(self, request_iterator, context):
+        """Missing associated documentation comment in .proto file."""
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+
+def add_ExampleServicer_to_server(servicer, server):
+    rpc_method_handlers = {
+            'Ping': grpc.unary_unary_rpc_method_handler(
+                    servicer.Ping,
+                    request_deserializer=ping__pb2.PingRequest.FromString,
+                    response_serializer=ping__pb2.PongResponse.SerializeToString,
+            ),
+            'PingStream': grpc.stream_stream_rpc_method_handler(
+                    servicer.PingStream,
+                    request_deserializer=ping__pb2.PingRequest.FromString,
+                    response_serializer=ping__pb2.PongResponse.SerializeToString,
+            ),
+    }
+    generic_handler = grpc.method_handlers_generic_handler(
+            'example.Example', rpc_method_handlers)
+    server.add_generic_rpc_handlers((generic_handler,))
+    server.add_registered_method_handlers('example.Example', rpc_method_handlers)
+
+
+ # This class is part of an EXPERIMENTAL API.
+class Example:
+    """Missing associated documentation comment in .proto file."""
+
+    @staticmethod
+    def Ping(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(
+            request,
+            target,
+            '/example.Example/Ping',
+            ping__pb2.PingRequest.SerializeToString,
+            ping__pb2.PongResponse.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)
+
+    @staticmethod
+    def PingStream(request_iterator,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.stream_stream(
+            request_iterator,
+            target,
+            '/example.Example/PingStream',
+            ping__pb2.PingRequest.SerializeToString,
+            ping__pb2.PongResponse.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)

hw2/hw/shop_api/api/carts/contracts.py

@@ -0,0 +1,35 @@
+from pydantic import BaseModel
+from ...store import queries
+from ...store.models import Cart
+
+
+class CartItemResponse(BaseModel):
+    id: int
+    name: str
+    quantity: int
+    available: bool
+
+
+class CartResponse(BaseModel):
+    id: int
+    items: list[CartItemResponse]
+    price: float
+
+    @staticmethod
+    def from_entity(cart: Cart):
+        items = []
+        for item_id, quantity in cart.item_id_to_count.items():
+            item = queries.get_item(item_id)
+            items.append(
+                CartItemResponse(
+                    id=item.id,
+                    name=item.name,
+                    quantity=quantity,
+                    available=not item.deleted,
+                )
+            )
+        return CartResponse(
+            id=cart.id,
+            items=items,
+            price=queries.cart_price(cart),
+        )

hw2/hw/shop_api/api/carts/routes.py

@@ -0,0 +1,41 @@
+from http import HTTPStatus
+from typing import Annotated
+from fastapi import APIRouter, Query, Response
+from pydantic import NonNegativeFloat, NonNegativeInt, PositiveInt
+from .contracts import CartResponse
+from ...store import queries
+
+
+router = APIRouter(prefix="/cart")
+
+
+@router.post("", status_code=HTTPStatus.CREATED)
+async def post_cart(response: Response) -> dict[str, int]:
+    cart = queries.add_cart()
+    response.headers["location"] = f"/cart/{cart.id}"
+    return {"id": cart.id}
+
+
+@router.get("/{id}")
+async def get_cart(id: int) -> CartResponse:
+    cart = queries.get_cart(id)
+    return CartResponse.from_entity(cart)
+
+
+@router.get("")
+async def get_carts(
+    offset: Annotated[NonNegativeInt, Query()] = 0,
+    limit: Annotated[PositiveInt, Query()] = 10,
+    min_price: Annotated[NonNegativeFloat | None, Query()] = None,
+    max_price: Annotated[NonNegativeFloat | None, Query()] = None,
+    min_quantity: Annotated[NonNegativeInt | None, Query()] = None,
+    max_quantity: Annotated[NonNegativeInt | None, Query()] = None,
+) -> list[CartResponse]:
+    carts = queries.get_carts(offset, limit, min_price, max_price, min_quantity, max_quantity)
+    return [CartResponse.from_entity(cart) for cart in carts]
+
+
+@router.post("/{cart_id}/add/{item_id}")
+async def add_item_to_cart(cart_id: int, item_id: int) -> CartResponse:
+    cart = queries.add_item_to_cart(cart_id, item_id)
+    return CartResponse.from_entity(cart)