Cleanup

Makefile

@@ -8,8 +8,7 @@ run:
 	@ $(RUN_IN_ENV) uvicorn \
 		main:app \
 		--reload \
-		--reload-dir=service \
+		--reload-dir=app 
-		--lifespan=off
 
 shell:
 	@ $(RUN_IN_ENV) python manage.py shell

README.md

@@ -0,0 +1,4 @@
+
+OpenAPI interface: http://localhost:8000/schema/swagger
+Example project: https://github.com/litestar-org/litestar-pg-redis-docker/tree/main
+

app/controllers/__init__.py

@@ -0,0 +1,26 @@
+from litestar import Router
+
+from app.controllers.company import CompanyController
+from app.controllers.fiscal_payment_mapping import FiscalPaymentMappingController
+from app.controllers.machine import MachineController
+from app.domain.company import Company
+from app.domain.fiscal_payment_mapping import FiscalPaymentMapping
+from app.domain.machine import Machine
+
+__all__ = ["create_router"]
+
+
+def create_router() -> Router:
+    return Router(
+        path="/v1",
+        route_handlers=[
+            CompanyController,
+            MachineController,
+            FiscalPaymentMappingController,
+        ],
+        signature_namespace={
+            "Company": Company,
+            "Machine": Machine,
+            "FiscalPaymentMapping": FiscalPaymentMapping,
+        },
+    )

app/controllers/company.py

@@ -0,0 +1,62 @@
+from typing import TYPE_CHECKING, Optional
+
+from litestar import Controller, get
+from litestar.contrib.repository.filters import LimitOffset, SearchFilter
+from litestar.di import Provide
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.domain.company import (
+    Company,
+    CompanyReadDTO,
+    CompanyWriteDTO,
+    Repository,
+    Service,
+)
+from app.lib.responses import ObjectListResponse, ObjectResponse
+
+if TYPE_CHECKING:
+    from sqlalchemy.ext.asyncio import AsyncSession
+
+
+DETAIL_ROUTE = "/{company_id:int}"
+
+
+def provides_service(db_session: AsyncSession) -> Service:
+    """Constructs repository and service objects for the request."""
+    return Service(Repository(session=db_session))
+
+
+class CompanyController(Controller):
+    dto = CompanyWriteDTO
+    return_dto = CompanyReadDTO
+    path = "/companies"
+    dependencies = {
+        "service": Provide(provides_service, sync_to_thread=False),
+    }
+    tags = ["Companies"]
+
+    @get()
+    async def get_companies(
+        self, service: Service, search: Optional[str] = None
+    ) -> ObjectListResponse[Company]:
+        filters = [
+            LimitOffset(limit=20, offset=0),
+        ]
+
+        if search is not None:
+            filters.append(
+                SearchFilter(
+                    field_name="caption",
+                    value=search,
+                ),
+            )
+
+        content = await service.list(*filters)
+        return ObjectListResponse(content=content)
+
+    @get(DETAIL_ROUTE)
+    async def get_company(
+        self, service: Service, company_id: int
+    ) -> ObjectResponse[Company]:
+        content = await service.get(company_id)
+        return ObjectResponse(content=content)

app/controllers/fiscal_payment_mapping.py

@@ -0,0 +1,66 @@
+from typing import TYPE_CHECKING, Optional
+
+from litestar import Controller, get, post
+from litestar.di import Provide
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.domain.fiscal_payment_mapping import (
+    FiscalPaymentMapping,
+    FiscalPaymentMappingReadDTO,
+    FiscalPaymentMappingWriteDTO,
+    Repository,
+    Service,
+)
+from app.lib.filters import ExactFilter
+from app.lib.responses import ObjectListResponse, ObjectResponse
+
+if TYPE_CHECKING:
+    from sqlalchemy.ext.asyncio import AsyncSession
+
+
+DETAIL_ROUTE = "/{id:int}"
+
+
+def provides_service(db_session: AsyncSession) -> Service:
+    """Constructs repository and service objects for the request."""
+    return Service(Repository(session=db_session))
+
+
+class FiscalPaymentMappingController(Controller):
+    dto = FiscalPaymentMappingWriteDTO
+    return_dto = FiscalPaymentMappingReadDTO
+    path = "/fiscal-payment-mappings"
+    dependencies = {
+        "service": Provide(provides_service, sync_to_thread=False),
+    }
+    tags = ["FiscalPaymentMappings"]
+
+    @post()
+    async def create_fiscal_payment_mappings(
+        self, data: FiscalPaymentMapping, service: Service
+    ) -> FiscalPaymentMapping:
+        return await service.create(data)
+
+    @get()
+    async def get_fiscal_payment_mappings(
+        self, service: Service, payment_device_code: Optional[int] = None
+    ) -> ObjectListResponse[FiscalPaymentMapping]:
+        filters = []
+
+        if payment_device_code is not None:
+            filters.append(
+                ExactFilter[int](
+                    field_name="payment_device_code",
+                    value=payment_device_code,
+                ),
+            )
+
+        content = await service.list(*filters)
+        return ObjectListResponse(content=content)
+
+    @get(DETAIL_ROUTE)
+    async def get_fiscal_payment_mapping(
+        self, service: Service, id: int
+    ) -> ObjectResponse[FiscalPaymentMapping]:
+        content = await service.get(id)
+        return ObjectResponse(content=content)

app/controllers/machine.py

@@ -0,0 +1,76 @@
+from typing import TYPE_CHECKING, Optional
+
+from litestar import Controller, get
+from litestar.contrib.repository.filters import LimitOffset, SearchFilter
+from litestar.di import Provide
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.domain.company import Company
+from app.domain.machine import (
+    Machine,
+    MachineReadDTO,
+    MachineWriteDTO,
+    Repository,
+    Service,
+)
+from app.lib.responses import ObjectListResponse, ObjectResponse
+
+if TYPE_CHECKING:
+    from sqlalchemy.ext.asyncio import AsyncSession
+
+
+DETAIL_ROUTE = "/{machine_id:int}"
+
+
+async def provides_service(db_session: AsyncSession, company_id: int) -> Service:
+    """Constructs repository and service objects for the request."""
+    from app.controllers.company import provides_service
+
+    company_service = provides_service(db_session)
+    company = await company_service.get(company_id)
+    return Service(Repository(session=db_session, company=company))
+
+
+async def get_company(db_session: AsyncSession, company_id: int) -> Company:
+    from app.controllers.company import provides_service
+
+    company_service = provides_service(db_session)
+    return await company_service.get(company_id)
+
+
+class MachineController(Controller):
+    dto = MachineWriteDTO
+    return_dto = MachineReadDTO
+    path = "/company/{company_id:int}/machines"
+    dependencies = {
+        "service": Provide(provides_service, sync_to_thread=False),
+    }
+    tags = ["Machines"]
+
+    @get()
+    async def get_machines(
+        self,
+        service: Service,
+        search: Optional[str] = None,
+    ) -> ObjectListResponse[Machine]:
+        filters = [
+            LimitOffset(limit=20, offset=0),
+        ]
+
+        if search is not None:
+            filters.append(
+                SearchFilter(
+                    field_name="caption",
+                    value=search,
+                ),
+            )
+
+        content = await service.list(*filters)
+        return ObjectListResponse(content=content)
+
+    @get(DETAIL_ROUTE)
+    async def get_machine(
+        self, service: Service, machine_id: int
+    ) -> ObjectResponse[Machine]:
+        content = await service.get(machine_id)
+        return ObjectResponse(content=content)

app/database.py

@@ -0,0 +1,39 @@
+from typing import AsyncGenerator
+
+from litestar.contrib.sqlalchemy.plugins import EngineConfig, SQLAlchemyAsyncConfig
+from litestar.exceptions import ClientException
+from litestar.status_codes import HTTP_409_CONFLICT
+from sqlalchemy import URL
+from sqlalchemy.exc import IntegrityError
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
+
+
+async def provide_transaction(
+    db_session: AsyncSession,
+) -> AsyncGenerator[AsyncSession, None]:
+    try:
+        async with db_session.begin():
+            yield db_session
+    except IntegrityError as exc:
+        raise ClientException(
+            status_code=HTTP_409_CONFLICT,
+            detail=str(exc),
+        ) from exc
+
+
+sessionmaker = async_sessionmaker(expire_on_commit=False)
+
+db_connection_string = URL.create(
+    drivername="postgresql+asyncpg",
+    username="televend",
+    password="televend",
+    host="localhost",
+    port=5433,
+    database="televend",
+)
+db_config = SQLAlchemyAsyncConfig(
+    connection_string=db_connection_string.render_as_string(hide_password=False),
+    engine_config=EngineConfig(
+        echo=True,
+    ),
+)

app/domain/company.py

@@ -0,0 +1,36 @@
+from typing import Annotated
+
+from litestar.contrib.sqlalchemy.base import BigIntBase
+from litestar.contrib.sqlalchemy.dto import SQLAlchemyDTO
+from litestar.dto import DTOConfig
+from sqlalchemy.orm import Mapped
+
+from app.lib import service
+from app.lib.filter_repository import FilterRepository
+
+
+class Company(BigIntBase):
+    __tablename__ = "vending_companies"  # type: ignore[assignment]
+
+    caption: Mapped[str]
+    address: Mapped[str]
+    city: Mapped[str]
+    phone: Mapped[str]
+    enabled: Mapped[str]
+    country_code: Mapped[str]
+    external_id: Mapped[str]
+    alive: Mapped[bool]
+
+
+class Repository(FilterRepository[Company]):
+    model_type = Company
+    alive_flag = "alive"
+
+
+class Service(service.Service[Company]):
+    repository_type = Repository
+
+
+write_config = DTOConfig(exclude={"id"})
+CompanyWriteDTO = SQLAlchemyDTO[Annotated[Company, write_config]]
+CompanyReadDTO = SQLAlchemyDTO[Company]

app/domain/fiscal_payment_mapping.py

@@ -0,0 +1,63 @@
+from enum import Enum
+from typing import Annotated, Optional
+
+import sqlalchemy
+from litestar.contrib.sqlalchemy.base import BigIntBase
+from litestar.contrib.sqlalchemy.dto import SQLAlchemyDTO
+from litestar.dto import DTOConfig
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.lib import service
+from app.lib.filter_repository import FilterRepository
+
+
+class FiscalModuleEnum(str, Enum):
+    CROATIA = "CROATIA"
+    HUNGARY = "HUNGARY"
+    ITALY = "ITALY"
+    MONTENEGRO = "MONTENEGRO"
+    ROMANIA = "ROMANIA"
+    RUSSIA = "RUSSIA"
+    SERBIA = "SERBIA"
+
+
+class PaymentTypeEnum(str, Enum):
+    CA = "CA"
+    DA = "DA"
+    DB = "DB"
+    DC = "DC"
+    DD = "DD"
+    PA4 = "PA4"
+    NEG = "NEG"
+    PA3 = "PA3"
+    TA = "TA"
+    WLT = "WLT"
+
+
+class FiscalPaymentMapping(BigIntBase):
+    __tablename__ = "fiscal_payment_mapping"  # type: ignore[assignment]
+
+    fiscal_module: Mapped[FiscalModuleEnum] = mapped_column(
+        sqlalchemy.Enum(FiscalModuleEnum, name="fiscal_module_enum")
+    )
+    code: Mapped[str]
+    payment_type: Mapped[PaymentTypeEnum] = mapped_column(
+        sqlalchemy.Enum(PaymentTypeEnum, name="televend_payment_type")
+    )
+    operation_mode_code: Mapped[int]
+    payment_device_code: Mapped[Optional[int]]
+
+
+class Repository(FilterRepository[FiscalPaymentMapping]):
+    model_type = FiscalPaymentMapping
+
+
+class Service(service.Service[FiscalPaymentMapping]):
+    repository_type = Repository
+
+
+write_config = DTOConfig(exclude={"id"})
+FiscalPaymentMappingWriteDTO = SQLAlchemyDTO[
+    Annotated[FiscalPaymentMapping, write_config]
+]
+FiscalPaymentMappingReadDTO = SQLAlchemyDTO[FiscalPaymentMapping]

app/domain/machine.py

@@ -0,0 +1,35 @@
+from typing import Annotated
+
+from litestar.contrib.sqlalchemy.base import BigIntBase
+from litestar.contrib.sqlalchemy.dto import SQLAlchemyDTO
+from litestar.dto import DTOConfig
+from sqlalchemy.orm import Mapped
+
+from app.lib import service
+from app.lib.company_owned_repository import CompanyOwnedRepository
+
+
+class Machine(BigIntBase):
+    __tablename__ = "machines"  # type: ignore[assignment]
+
+    caption: Mapped[str]
+    enabled: Mapped[bool]
+    alive: Mapped[bool]
+    deleted: Mapped[bool]
+    external_id: Mapped[str]
+    owner_id: Mapped[int]
+
+
+class Repository(CompanyOwnedRepository[Machine]):
+    model_type = Machine
+    alive_flag = "alive"
+    company_id_field = "owner_id"
+
+
+class Service(service.Service[Machine]):
+    repository_type = Repository
+
+
+write_config = DTOConfig(exclude={"id"})
+MachineWriteDTO = SQLAlchemyDTO[Annotated[Machine, write_config]]
+MachineReadDTO = SQLAlchemyDTO[Machine]

app/lib/company_owned_repository.py

@@ -0,0 +1,89 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
+from litestar.contrib.repository import FilterTypes
+from litestar.contrib.sqlalchemy.repository import ModelT
+from litestar.contrib.sqlalchemy.repository.types import SelectT
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import InstrumentedAttribute
+
+from app.lib.filter_repository import FilterRepository
+
+if TYPE_CHECKING:
+    from app.domain.company import Company
+
+
+class CompanyOwnedRepository(FilterRepository[ModelT]):
+    company_id_field: str | None = None
+
+    def __init__(
+        self,
+        *,
+        company: Company,
+        statement: SelectT | None = None,
+        session: AsyncSession,
+        auto_expunge: bool = False,
+        auto_refresh: bool = True,
+        auto_commit: bool = False,
+        **kwargs: Any,
+    ) -> None:
+        self.company = company
+
+        super().__init__(
+            statement=statement,
+            session=session,
+            auto_expunge=auto_expunge,
+            auto_refresh=auto_refresh,
+            auto_commit=auto_commit,
+            **kwargs,
+        )
+
+    def _get_company_filter_statement(self, statement: SelectT | None) -> SelectT:
+        if not self.company_id_field:
+            raise AttributeError(
+                f"company_id_field must be set for {self.__class__.__name__}"
+            )
+
+        column = self._get_column_by_name(self.company_id_field)
+        if column is None:
+            raise AttributeError(
+                f"column {self.company_id_field} not found in {self.__class__.__name__}"
+            )
+
+        stmt = statement if statement is not None else self.statement
+        return stmt.where(column == self.company.id)
+
+    def _apply_filters(
+        self, *filters: FilterTypes, apply_pagination: bool = True, statement: SelectT
+    ) -> SelectT:
+        if not self.company_id_field:
+            raise AttributeError(
+                f"company_id_field must be set for {self.__class__.__name__}"
+            )
+
+        statement = super()._apply_filters(
+            *filters, apply_pagination=apply_pagination, statement=statement
+        )
+
+        statement = statement.where(
+            self._get_column_by_name(self.company_id_field) == self.company.id
+        )
+
+        return statement
+
+    async def get(  # type: ignore[override]
+        self,
+        item_id: Any,
+        auto_expunge: bool | None = None,
+        statement: SelectT | None = None,
+        id_attribute: str | InstrumentedAttribute | None = None,
+    ) -> ModelT:
+        statement = self._get_company_filter_statement(statement)
+
+        return await super().get(
+            item_id=item_id,
+            auto_expunge=auto_expunge,
+            statement=statement,
+            id_attribute=id_attribute,
+        )

app/lib/dependencies.py

@@ -0,0 +1,150 @@
+from datetime import datetime
+from uuid import UUID
+
+from litestar.contrib.repository.filters import BeforeAfter, CollectionFilter, FilterTypes, LimitOffset
+from litestar.di import Provide
+from litestar.params import Dependency, Parameter
+
+DEFAULT_PAGINATION_LIMIT = 20
+
+__all__ = [
+    "create_collection_dependencies",
+    "provide_created_filter",
+    "provide_filter_dependencies",
+    "provide_id_filter",
+    "provide_limit_offset_pagination",
+    "provide_updated_filter",
+]
+
+
+DTorNone = datetime | None
+
+CREATED_FILTER_DEPENDENCY_KEY = "created_filter"
+FILTERS_DEPENDENCY_KEY = "filters"
+ID_FILTER_DEPENDENCY_KEY = "id_filter"
+LIMIT_OFFSET_DEPENDENCY_KEY = "limit_offset"
+UPDATED_FILTER_DEPENDENCY_KEY = "updated_filter"
+
+
+def provide_id_filter(
+    ids: list[UUID] | None = Parameter(query="ids", default=None, required=False)
+) -> CollectionFilter[UUID]:
+    """Return type consumed by ``Repository.filter_in_collection()``.
+
+    Parameters
+    ----------
+    ids : list[UUID] | None
+        Parsed out of comma separated list of values in query params.
+
+    Returns:
+    -------
+    CollectionFilter[UUID]
+    """
+    return CollectionFilter(field_name="id", values=ids or [])
+
+
+def provide_created_filter(
+    before: DTorNone = Parameter(query="created-before", default=None, required=False),
+    after: DTorNone = Parameter(query="created-after", default=None, required=False),
+) -> BeforeAfter:
+    """Return type consumed by `Repository.filter_on_datetime_field()`.
+
+    Parameters
+    ----------
+    before : datetime | None
+        Filter for records updated before this date/time.
+    after : datetime | None
+        Filter for records updated after this date/time.
+    """
+    return BeforeAfter("created_at", before, after)
+
+
+def provide_updated_filter(
+    before: DTorNone = Parameter(query="updated-before", default=None, required=False),
+    after: DTorNone = Parameter(query="updated-after", default=None, required=False),
+) -> BeforeAfter:
+    """Return type consumed by `Repository.filter_on_datetime_field()`.
+    Parameters
+    ----------
+    before : datetime | None
+        Filter for records updated before this date/time.
+    after : datetime | None
+        Filter for records updated after this date/time.
+    """
+    return BeforeAfter("updated_at", before, after)
+
+
+def provide_limit_offset_pagination(
+    page: int = Parameter(ge=1, default=1, required=False),
+    page_size: int = Parameter(
+        query="page-size",
+        ge=1,
+        default=DEFAULT_PAGINATION_LIMIT,
+        required=False,
+    ),
+) -> LimitOffset:
+    """Return type consumed by `Repository.apply_limit_offset_pagination()`.
+    Parameters
+    ----------
+    page : int
+        LIMIT to apply to select.
+    page_size : int
+        OFFSET to apply to select.
+    """
+    return LimitOffset(page_size, page_size * (page - 1))
+
+
+def provide_filter_dependencies(
+    created_filter: BeforeAfter = Dependency(skip_validation=True),
+    updated_filter: BeforeAfter = Dependency(skip_validation=True),
+    id_filter: CollectionFilter = Dependency(skip_validation=True),
+    limit_offset: LimitOffset = Dependency(skip_validation=True),
+) -> list[FilterTypes]:
+    """Common collection route filtering dependencies. Add all filters to any
+    route by including this function as a dependency, e.g:
+
+        @get
+        def get_collection_handler(filters: Filters) -> ...:
+            ...
+    The dependency is provided at the application layer, so only need to inject the dependency where
+    necessary.
+
+    Parameters
+    ----------
+    id_filter : repository.CollectionFilter
+        Filter for scoping query to limited set of identities.
+    created_filter : repository.BeforeAfter
+        Filter for scoping query to instance creation date/time.
+    updated_filter : repository.BeforeAfter
+        Filter for scoping query to instance update date/time.
+    limit_offset : repository.LimitOffset
+        Filter for query pagination.
+
+    Returns:
+    -------
+    list[FilterTypes]
+        List of filters parsed from connection.
+    """
+    return [
+        created_filter,
+        id_filter,
+        limit_offset,
+        updated_filter,
+    ]
+
+
+def create_collection_dependencies() -> dict[str, Provide]:
+    """Creates a dictionary of provides for pagination endpoints.
+
+    Returns:
+    -------
+    dict[str, Provide]
+
+    """
+    return {
+        LIMIT_OFFSET_DEPENDENCY_KEY: Provide(provide_limit_offset_pagination, sync_to_thread=False),
+        UPDATED_FILTER_DEPENDENCY_KEY: Provide(provide_updated_filter, sync_to_thread=False),
+        CREATED_FILTER_DEPENDENCY_KEY: Provide(provide_created_filter, sync_to_thread=False),
+        ID_FILTER_DEPENDENCY_KEY: Provide(provide_id_filter, sync_to_thread=False),
+        FILTERS_DEPENDENCY_KEY: Provide(provide_filter_dependencies, sync_to_thread=False),
+    }

app/lib/exceptions.py

@@ -0,0 +1,68 @@
+import logging
+from typing import TYPE_CHECKING
+
+from litestar.contrib.repository.exceptions import (
+    ConflictError as RepositoryConflictException,
+)
+from litestar.contrib.repository.exceptions import (
+    NotFoundError as RepositoryNotFoundException,
+)
+from litestar.contrib.repository.exceptions import (
+    RepositoryError as RepositoryException,
+)
+from litestar.exceptions import (
+    HTTPException,
+    InternalServerException,
+    NotFoundException,
+)
+from litestar.middleware.exceptions.middleware import create_exception_response
+
+from .service import ServiceError
+
+if TYPE_CHECKING:
+    from litestar.connection import Request
+    from litestar.response import Response
+
+__all__ = [
+    "repository_exception_to_http_response",
+    "service_exception_to_http_response",
+]
+
+logger = logging.getLogger(__name__)
+
+
+class ConflictException(HTTPException):
+    status_code = 409
+
+
+def repository_exception_to_http_response(request: "Request", exc: RepositoryException) -> "Response":
+    """Transform repository exceptions to HTTP exceptions.
+
+    Args:
+        _: The request that experienced the exception.
+        exc: Exception raised during handling of the request.
+
+    Returns:
+        Exception response appropriate to the type of original exception.
+    """
+    http_exc: type[HTTPException]
+    if isinstance(exc, RepositoryNotFoundException):
+        http_exc = NotFoundException
+    elif isinstance(exc, RepositoryConflictException):
+        http_exc = ConflictException
+    else:
+        http_exc = InternalServerException
+    return create_exception_response(request, exc=http_exc())
+
+
+def service_exception_to_http_response(request: "Request", exc: ServiceError) -> "Response":
+    """Transform service exceptions to HTTP exceptions.
+
+    Args:
+        _: The request that experienced the exception.
+        exc: Exception raised during handling of the request.
+
+    Returns:
+        Exception response appropriate to the type of original exception.
+    """
+    return create_exception_response(request, InternalServerException())

app/lib/filter_repository.py

@@ -0,0 +1,38 @@
+from typing import Optional, cast
+
+from litestar.contrib.repository import FilterTypes
+from litestar.contrib.sqlalchemy.repository import ModelT, SQLAlchemyAsyncRepository
+from litestar.contrib.sqlalchemy.repository.types import SelectT
+from sqlalchemy import true, Column
+
+from app.lib.filters import ExactFilter
+
+
+class FilterRepository(SQLAlchemyAsyncRepository[ModelT]):
+    alive_flag: Optional[str] = None
+
+    def _get_column_by_name(self, name: str) -> Column | None:
+        return cast(Column, getattr(self.model_type, name, None))
+
+    def _apply_filters(
+        self, *filters: FilterTypes, apply_pagination: bool = True, statement: SelectT
+    ) -> SelectT:
+        standard_filters = []
+        for filter_ in filters:
+            if isinstance(filter_, ExactFilter):
+                statement = statement.where(
+                    self._get_column_by_name(filter_.field_name) == filter_.value
+                )
+            else:
+                standard_filters.append(filter_)
+
+        statement = super()._apply_filters(
+            *standard_filters, apply_pagination=apply_pagination, statement=statement
+        )
+
+        if self.alive_flag:
+            statement = statement.where(
+                self._get_column_by_name(self.alive_flag) == true()
+            )
+
+        return statement

app/lib/filters.py

@@ -0,0 +1,10 @@
+from dataclasses import dataclass
+from typing import Generic, TypeVar
+
+T = TypeVar("T")
+
+
+@dataclass
+class ExactFilter(Generic[T]):
+    field_name: str
+    value: T

app/lib/responses.py

@@ -0,0 +1,26 @@
+from dataclasses import dataclass
+from typing import Generic, TypeVar
+
+T = TypeVar("T")
+
+
+@dataclass
+class ObjectResponse(Generic[T]):
+    content: T
+
+
+@dataclass
+class ObjectListResponse(Generic[T]):
+    content: list[T]
+
+
+@dataclass
+class PaginationMeta:
+    page: int
+    page_count: int
+
+
+@dataclass
+class PaginatedObjectListResponse(Generic[T]):
+    content: list[T]
+    meta: PaginationMeta

app/lib/service.py

@@ -0,0 +1,95 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, Generic
+
+from litestar.contrib.sqlalchemy.repository import ModelT
+
+__all__ = ["Service", "ServiceError"]
+
+
+if TYPE_CHECKING:
+    from litestar.contrib.repository import AbstractAsyncRepository, FilterTypes
+
+
+class ServiceError(Exception):
+    """Base class for `Service` related exceptions."""
+
+
+class Service(Generic[ModelT]):
+    def __init__(self, repository: AbstractAsyncRepository[ModelT]) -> None:
+        """Generic Service object.
+
+        Args:
+            repository: Instance conforming to `AbstractRepository` interface.
+        """
+        self.repository = repository
+
+    async def create(self, data: ModelT) -> ModelT:
+        """Wraps repository instance creation.
+
+        Args:
+            data: Representation to be created.
+
+        Returns:
+            Representation of created instance.
+        """
+        return await self.repository.add(data)
+
+    async def list(self, *filters: FilterTypes, **kwargs: Any) -> list[ModelT]:
+        """Wraps repository scalars operation.
+
+        Args:
+            *filters: Collection route filters.
+            **kwargs: Keyword arguments for attribute based filtering.
+
+        Returns:
+            The list of instances retrieved from the repository.
+        """
+        return await self.repository.list(*filters, **kwargs)
+
+    async def update(self, id_: Any, data: ModelT) -> ModelT:
+        """Wraps repository update operation.
+
+        Args:
+            id_: Identifier of item to be updated.
+            data: Representation to be updated.
+
+        Returns:
+            Updated representation.
+        """
+        return await self.repository.update(data)
+
+    async def upsert(self, id_: Any, data: ModelT) -> ModelT:
+        """Wraps repository upsert operation.
+
+        Args:
+            id_: Identifier of the object for upsert.
+            data: Representation for upsert.
+
+        Returns:
+        -------
+            Updated or created representation.
+        """
+        return await self.repository.upsert(data)
+
+    async def get(self, id_: Any) -> ModelT:
+        """Wraps repository scalar operation.
+
+        Args:
+            id_: Identifier of instance to be retrieved.
+
+        Returns:
+            Representation of instance with identifier `id_`.
+        """
+        return await self.repository.get(id_)
+
+    async def delete(self, id_: Any) -> ModelT:
+        """Wraps repository delete operation.
+
+        Args:
+            id_: Identifier of instance to be deleted.
+
+        Returns:
+            Representation of the deleted instance.
+        """
+        return await self.repository.delete(id_)

main.py

@@ -1,9 +1,30 @@
+from typing import Any
+
 from litestar import Litestar, get
+from litestar.contrib.repository.exceptions import (
+    RepositoryError as RepositoryException,
+)
+from litestar.contrib.sqlalchemy.plugins import SQLAlchemyPlugin
+from litestar.openapi import OpenAPIConfig
+
+from app.controllers import create_router
+from app.database import db_config, provide_transaction
+from app.lib import exceptions
+from app.lib.service import ServiceError
+
+def create_app(**kwargs: Any) -> Litestar:
+    return Litestar(
+        route_handlers=[create_router()],
+        openapi_config=OpenAPIConfig(title="My API", version="1.0.0"),
+        dependencies={"session": provide_transaction},
+        plugins=[SQLAlchemyPlugin(db_config)],
+        exception_handlers={
+            RepositoryException: exceptions.repository_exception_to_http_response,  # type: ignore[dict-item]
+            ServiceError: exceptions.service_exception_to_http_response,  # type: ignore[dict-item]
+        },
+        debug=True,
+        **kwargs,
+    )
 
 
-@get("/")
+app = create_app()
-async def hello_world() -> str:
-    return "Hello, world!"
-
-
-app = Litestar([hello_world])

poetry.lock

@@ -20,6 +20,59 @@ doc = ["Sphinx", "packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-
 test = ["anyio[trio]", "coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "mock (>=4)", "psutil (>=5.9)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (>=0.17)"]
 trio = ["trio (<0.22)"]
 
+[[package]]
+name = "asyncpg"
+version = "0.28.0"
+description = "An asyncio PostgreSQL driver"
+optional = false
+python-versions = ">=3.7.0"
+files = [
+    {file = "asyncpg-0.28.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:0a6d1b954d2b296292ddff4e0060f494bb4270d87fb3655dd23c5c6096d16d83"},
+    {file = "asyncpg-0.28.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:0740f836985fd2bd73dca42c50c6074d1d61376e134d7ad3ad7566c4f79f8184"},
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+    {file = "asyncpg-0.28.0-cp310-cp310-win_amd64.whl", hash = "sha256:76aacdcd5e2e9999e83c8fbcb748208b60925cc714a578925adcb446d709016c"},
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+    {file = "asyncpg-0.28.0-cp39-cp39-win_amd64.whl", hash = "sha256:3ed77f00c6aacfe9d79e9eff9e21729ce92a4b38e80ea99a58ed382f42ebd55b"},
+    {file = "asyncpg-0.28.0.tar.gz", hash = "sha256:7252cdc3acb2f52feaa3664280d3bcd78a46bd6c10bfd681acfffefa1120e278"},
+]
+
+[package.extras]
+docs = ["Sphinx (>=5.3.0,<5.4.0)", "sphinx-rtd-theme (>=1.2.2)", "sphinxcontrib-asyncio (>=0.3.0,<0.4.0)"]
+test = ["flake8 (>=5.0,<6.0)", "uvloop (>=0.15.3)"]
+
 [[package]]
 name = "certifi"
 version = "2023.7.22"
@@ -95,6 +148,79 @@ files = [
     {file = "fast_query_parsers-1.0.3.tar.gz", hash = "sha256:5200a9e02997ad51d4d76a60ea1b256a68a184b04359540eb6310a15013df68f"},
 ]
 
+[[package]]
+name = "greenlet"
+version = "2.0.2"
+description = "Lightweight in-process concurrent programming"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+files = [
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 pydantic = ["pydantic[email]"]
 
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 [[package]]
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+]
+
+[package.dependencies]
+greenlet = {version = "!=0.4.17", markers = "platform_machine == \"win32\" or platform_machine == \"WIN32\" or platform_machine == \"AMD64\" or platform_machine == \"amd64\" or platform_machine == \"x86_64\" or platform_machine == \"ppc64le\" or platform_machine == \"aarch64\""}
+typing-extensions = ">=4.2.0"
+
+[package.extras]
+aiomysql = ["aiomysql (>=0.2.0)", "greenlet (!=0.4.17)"]
+aiosqlite = ["aiosqlite", "greenlet (!=0.4.17)", "typing-extensions (!=3.10.0.1)"]
+asyncio = ["greenlet (!=0.4.17)"]
+asyncmy = ["asyncmy (>=0.2.3,!=0.2.4,!=0.2.6)", "greenlet (!=0.4.17)"]
+mariadb-connector = ["mariadb (>=1.0.1,!=1.1.2,!=1.1.5)"]
+mssql = ["pyodbc"]
+mssql-pymssql = ["pymssql"]
+mssql-pyodbc = ["pyodbc"]
+mypy = ["mypy (>=0.910)"]
+mysql = ["mysqlclient (>=1.4.0)"]
+mysql-connector = ["mysql-connector-python"]
+oracle = ["cx-oracle (>=7)"]
+oracle-oracledb = ["oracledb (>=1.0.1)"]
+postgresql = ["psycopg2 (>=2.7)"]
+postgresql-asyncpg = ["asyncpg", "greenlet (!=0.4.17)"]
+postgresql-pg8000 = ["pg8000 (>=1.29.1)"]
+postgresql-psycopg = ["psycopg (>=3.0.7)"]
+postgresql-psycopg2binary = ["psycopg2-binary"]
+postgresql-psycopg2cffi = ["psycopg2cffi"]
+postgresql-psycopgbinary = ["psycopg[binary] (>=3.0.7)"]
+pymysql = ["pymysql"]
+sqlcipher = ["sqlcipher3-binary"]
+
 [[package]]
 name = "typing-extensions"
 version = "4.7.1"
@@ -504,4 +760,4 @@ anyio = ">=3.0.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "1de8a8d36d3dce9aac7472bc4997a2f51d623e809d94c20f30e538bb73562c67"
+content-hash = "411f2e851f3c3fdf05d5a8f1c200b8ded6223b8e4bb9b1be00db2f6a28a8dc26"

pyproject.toml

@@ -10,6 +10,9 @@ packages = [{include = "litestar_machines"}]
 python = "^3.11"
 litestar = "^2.0.1"
 uvicorn = "^0.23.2"
+sqlalchemy = "^2.0.20"
+asyncpg = "^0.28.0"
+pydantic = "<2.0"
 
 
 [tool.poetry.group.dev.dependencies]