Lab 7

students_folder/zemliakov_alexey/lab7/Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

students_folder/zemliakov_alexey/lab7/app/main.py

@@ -0,0 +1,24 @@
+from fastapi import FastAPI
+
+from app.router_room import router as room_router
+
+from app.router_booking import router as booking_router
+
+from app.operations.database_migrations import create_table, delete_table
+
+from contextlib import asynccontextmanager
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    await create_table()
+    print("Таблица готова")
+    yield
+    await delete_table()
+    print("Таблица очищена")
+
+
+app = FastAPI(lifespan=lifespan)
+
+app.include_router(room_router)
+app.include_router(booking_router)

students_folder/zemliakov_alexey/lab7/app/models/database_models.py

@@ -0,0 +1,32 @@
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+from sqlalchemy import DateTime, BIGINT, ForeignKey
+from datetime import datetime
+from zoneinfo import ZoneInfo
+
+
+def utc_now() -> datetime:
+    return datetime.now(ZoneInfo("UTC"))
+
+
+class TableModel(DeclarativeBase):
+    pass
+
+
+class RoomORM(TableModel):
+    __tablename__ = "room"
+    __table_args__ = {"schema": "public"}
+
+    id: Mapped[int] = mapped_column(BIGINT, primary_key=True, autoincrement=True)
+    name: Mapped[str]
+    capacity: Mapped[int]
+    location: Mapped[str]
+
+
+class BookingORM(TableModel):
+    __tablename__ = "booking"
+    __table_args__ = {"schema": "public"}
+    id: Mapped[int] = mapped_column(BIGINT, primary_key=True, autoincrement=True)
+    room_id: Mapped[int] = mapped_column(BIGINT, ForeignKey("public.room.id"))
+    user_name: Mapped[str]
+    start_time: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)
+    end_time: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)

students_folder/zemliakov_alexey/lab7/app/models/store_models.py

@@ -0,0 +1,83 @@
+from pydantic import BaseModel, AfterValidator, Field, ConfigDict, RootModel, model_validator
+from typing_extensions import Self
+from typing import Annotated, Literal, List
+from datetime import datetime
+from zoneinfo import ZoneInfo
+
+
+# 2025-04-05T12:00:00Z
+def validate_aware(dt: datetime) -> datetime:
+    if dt.tzinfo is None:
+        raise ValueError("datetime must include timezone information")
+    return dt
+
+
+AwareDatetime = Annotated[datetime, AfterValidator(validate_aware)]
+
+
+def default_execution_time():
+    return datetime.now(ZoneInfo("UTC"))
+
+
+class Room(BaseModel):
+    name: str
+    capacity: int
+    location: str
+
+
+class RoomAdd(Room):
+    pass
+
+
+class RoomGet(Room):
+    id: int
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class RoomListGet(RootModel[List[RoomGet]]):
+    model_config = ConfigDict(from_attributes=True)
+
+
+class RoomFreeGet(BaseModel):
+    id: int
+    start_time: AwareDatetime = Field(default_factory=default_execution_time)
+    end_time: AwareDatetime = Field(default_factory=default_execution_time)
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class Booking(BaseModel):
+    room_id: int
+    user_name: str
+    start_time: AwareDatetime = Field(default_factory=default_execution_time)
+    end_time: AwareDatetime = Field(default_factory=default_execution_time)
+
+    @model_validator(mode="after")
+    def check_date(self) -> Self:
+        if self.start_time >= self.end_time:
+            raise ValueError("start date must be before end")
+        return self
+
+
+class BookingReserve(Booking):
+    pass
+
+
+class DeleteBookingReserve(BaseModel):
+    booking_id: int
+    user_name: str
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class UserBookingGet(BaseModel):
+    user_name: str
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class UserBookingGetRes(Booking):
+    id: int
+
+    model_config = ConfigDict(from_attributes=True)

students_folder/zemliakov_alexey/lab7/app/operations/database_migrations.py

@@ -0,0 +1,14 @@
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+from app.models.database_models import TableModel
+
+engine = create_async_engine("postgresql+asyncpg://postgres:postgres@postgres_container:5432/postgres")
+
+
+async def create_table():
+    async with engine.begin() as conn:
+        await conn.run_sync(TableModel.metadata.create_all)
+
+
+async def delete_table():
+    async with engine.begin() as conn:
+        await conn.run_sync(TableModel.metadata.drop_all)

students_folder/zemliakov_alexey/lab7/app/operations/database_operations.py

@@ -0,0 +1,91 @@
+from app.models.database_models import RoomORM, BookingORM
+from app.models.store_models import RoomAdd, RoomFreeGet, RoomListGet, BookingReserve, DeleteBookingReserve, \
+    UserBookingGet, UserBookingGetRes
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+from sqlalchemy import select, delete
+from typing import List
+
+engine = create_async_engine("postgresql+asyncpg://postgres:postgres@postgres_container:5432/postgres")
+new_session = async_sessionmaker(engine, expire_on_commit=False)
+
+
+class RoomWorkflow:
+    @classmethod
+    async def add_room(cls, room: RoomAdd) -> int:
+        async with new_session() as session:
+            data = room.model_dump()
+            new_room = RoomORM(**data)
+            session.add(new_room)
+            await session.flush()
+            await session.commit()
+            return new_room.id
+
+    @classmethod
+    async def get_rooms(cls) -> RoomListGet:
+        async with new_session() as session:
+            query = select(RoomORM)
+            result = await session.execute(query)
+            room_models = result.scalars().all()
+
+            rooms = RoomListGet.model_validate(room_models)
+            return rooms.root
+
+
+class BookingWorkflow:
+    @classmethod
+    async def reserve_room(cls, booking: BookingReserve) -> int:
+        async with new_session() as session:
+            data = booking.model_dump()
+            if not await cls.check_available(RoomFreeGet(id=booking.room_id, start_time=booking.start_time,
+                                                         end_time=booking.end_time)):
+                await session.commit()
+                raise KeyError
+            new_booking = BookingORM(**data)
+            session.add(new_booking)
+            await session.flush()
+            await session.commit()
+            return new_booking.id
+
+    @classmethod
+    async def delete_reserve_room(cls, booking: DeleteBookingReserve) -> str:
+        async with new_session() as session:
+            data = booking.model_dump()
+            query = delete(BookingORM).where(
+                BookingORM.id == data["booking_id"] and BookingORM.user_name == data["user_name"])
+            results = await session.execute(query)
+            await session.commit()
+            if results.rowcount() > 0:
+                return f"success deleted {results.rowcount()} rows"
+
+            return "nothing for delete"
+
+    @classmethod
+    async def get_users_booking(cls, user: UserBookingGet) -> List[UserBookingGetRes]:
+        async with new_session() as session:
+            data = user.model_dump()
+            query = select(BookingORM).where(BookingORM.user_name == data["user_name"])
+            result = await session.execute(query)
+            await session.commit()
+            res = []
+            for row in result.scalars().all():
+                res.append(UserBookingGetRes(id=row.id, room_id=row.room_id, user_name=row.user_name,
+                                             start_time=row.start_time, end_time=row.end_time))
+
+            return res
+
+    @classmethod
+    async def check_available(cls, free_room: RoomFreeGet) -> bool:
+        async with new_session() as session:
+            data = free_room.model_dump()
+            query = select(BookingORM).where(BookingORM.room_id == data["id"])
+            result = await session.execute(query)
+            room_models = result.scalars().all()
+            for row in room_models:
+                if check_intersection_time(data["start_time"], data["end_time"], row.start_time, row.end_time):
+                    return False
+            await session.commit()
+            return True
+
+
+def check_intersection_time(t1_start, t1_end, t2_start, t2_end) -> bool:
+    return (t1_start <= t2_start < t1_end) or (t2_start <= t1_start < t2_end)

students_folder/zemliakov_alexey/lab7/app/router_booking.py

@@ -0,0 +1,45 @@
+from fastapi import APIRouter, Depends
+
+from app.operations.database_operations import BookingWorkflow
+from app.models.store_models import BookingReserve, DeleteBookingReserve, UserBookingGet, UserBookingGetRes, RoomFreeGet
+
+from typing import List
+
+router = APIRouter(
+    prefix="/booking",
+    tags=["бронирования"],
+)
+
+
+@router.post(
+    "/add_booking",
+    summary="Добавление бронирования")
+async def add_booking(booking: BookingReserve = Depends()) -> dict:
+    try:
+        id = await BookingWorkflow.reserve_room(booking)
+    except ValueError:
+        return {"error": "unprocessable entity"}
+    except KeyError:
+        return {"error": "this room reserved for this time"}
+    return {"id": id}
+
+
+@router.get("/get_users_booking",
+            summary="Получение бронирований пользователя")
+async def get_rooms(user: UserBookingGet = Depends()) -> List[UserBookingGetRes]:
+    rooms = await BookingWorkflow.get_users_booking(user)
+    return rooms
+
+
+@router.delete("/delete_booking",
+               summary="Удаление бронирования пользователя")
+async def get_rooms(user: DeleteBookingReserve = Depends()) -> str:
+    res = await BookingWorkflow.delete_reserve_room(user)
+    return res
+
+
+@router.get("/check_room",
+            summary="Проверка доступности бронирования комнаты на время")
+async def get_rooms(room: RoomFreeGet = Depends()) -> bool:
+    res = await BookingWorkflow.check_available(room)
+    return res

students_folder/zemliakov_alexey/lab7/app/router_room.py

@@ -0,0 +1,25 @@
+from fastapi import APIRouter, Depends
+
+from app.operations.database_operations import RoomWorkflow
+from app.models.store_models import RoomAdd, RoomGet
+
+from typing import List
+
+
+router = APIRouter(
+    prefix="/rooms",
+    tags=["комнаты"],
+)
+
+@router.post(
+    "/add_room",
+    summary="Добавление новой комнаты")
+async def add_room(room: RoomAdd = Depends()) -> dict:
+    id = await RoomWorkflow.add_room(room)
+    return {"id": id}
+
+@router.get("/get_rooms",
+            summary="Получение комнат")
+async def get_rooms() -> List[RoomGet]:
+    rooms = await RoomWorkflow.get_rooms()
+    return rooms

students_folder/zemliakov_alexey/lab7/docker-compose.yaml

@@ -0,0 +1,45 @@
+version: '3.9'
+
+services:
+  postgres:
+    image: postgres:13
+    container_name: postgres_container
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+      PGDATA: /var/lib/postgresql/data/pgdata
+    ports:
+      - "5432:5432"
+    volumes:
+      - ./pgdata:/var/lib/postgresql/data/pgdata
+    command: >
+      postgres -c max_connections=1000
+               -c shared_buffers=256MB
+               -c effective_cache_size=768MB
+               -c maintenance_work_mem=64MB
+               -c checkpoint_completion_target=0.7
+               -c wal_buffers=16MB
+               -c default_statistics_target=100
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d postgres"]
+      interval: 3s
+      timeout: 5s
+      retries: 10
+      start_period: 10s
+    restart: unless-stopped
+
+  app:
+    build: .
+    container_name: fastapi_app
+    ports:
+      - "8000:8000"
+    environment:
+      DATABASE_URL: postgresql://postgres:postgres@postgres:5432/postgres
+    depends_on:
+      postgres:
+        condition: service_healthy
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8000
+    volumes:
+      - .:/app
+    restart: unless-stopped

students_folder/zemliakov_alexey/lab7/requirements.txt

@@ -0,0 +1,5 @@
+fastapi==0.110.2
+pydantic==2.7.0
+SQLAlchemy==2.0.30
+uvicorn==0.29.0
+asyncpg==0.29.0