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Task queue abstraction for Spakky Framework (@TaskHandler, @task)

Project description

spakky-task

Spakky Framework를 위한 태스크 큐 추상화 레이어입니다. @task@schedule metadata를 backend plugin이 실행 가능한 task route로 변환하게 합니다.

설치

pip install spakky-task

주요 기능

  • @TaskHandler stereotype: 클래스를 task handler pod로 표시합니다.
  • @task decorator: 메서드를 on-demand dispatch 가능한 task로 표시합니다.
  • @schedule decorator: 메서드를 주기 실행 대상(interval, daily, crontab)으로 표시합니다.
  • Crontab value object: Weekday/Month enum을 사용하는 Python-native cron 명세
  • Post-processor: @TaskHandler pod에서 task route를 자동 스캔하고 등록합니다.
  • 직접 실행: 같은 프로세스에서 task를 실행할 때 기존 request-scope context를 유지합니다.
  • 구현체 중립: 플러그인을 통해 Celery 등 임의의 태스크 큐 백엔드와 동작

사용법

On-demand 태스크

@task는 메서드를 on-demand dispatch 대상으로 표시합니다. 백엔드 플러그인(예: spakky-celery)은 AOP로 호출을 가로채 task queue로 라우팅합니다.

from spakky.task import TaskHandler, task


@TaskHandler()
class EmailTaskHandler:
    @task
    def send_email(self, to: str, subject: str, body: str) -> None:
        """Dispatched to the task queue when called."""
        ...

예약 태스크

@schedule는 메서드를 주기 실행 대상으로 표시합니다. interval, at, crontab 중 정확히 하나를 지정해야 합니다.

from datetime import time, timedelta

from spakky.task import TaskHandler, Crontab, Weekday, schedule


@TaskHandler()
class MaintenanceHandler:
    @schedule(interval=timedelta(minutes=30))
    def health_check(self) -> None:
        """Runs every 30 minutes."""
        ...

    @schedule(at=time(3, 0))
    def daily_cleanup(self) -> None:
        """Runs daily at 03:00."""
        ...

    @schedule(crontab=Crontab(weekday=Weekday.MONDAY, hour=9))
    def weekly_report(self) -> None:
        """Runs every Monday at 09:00."""
        ...

Crontab 명세

Crontab은 cron 문자열 대신 Python-native 타입을 사용합니다. None은 "every"(wildcard)를 의미합니다.

from spakky.task import Crontab, Weekday, Month

# Every Monday at 03:00
Crontab(weekday=Weekday.MONDAY, hour=3)

# Mon/Wed/Fri at 09:00
Crontab(weekday=(Weekday.MONDAY, Weekday.WEDNESDAY, Weekday.FRIDAY), hour=9)

# 1st and 15th of every month at midnight
Crontab(day=(1, 15))

# Every January 1st at midnight
Crontab(month=Month.JANUARY, day=1)

필드 순서(시간 단위가 큰 것부터):

필드 타입 기본값
month Month | tuple[Month, ...] | None None(every)
day int | tuple[int, ...] | None None(every)
weekday Weekday | tuple[Weekday, ...] | None None(every)
hour int 0
minute int 0

Task route 접근

from spakky.task import TaskRegistrationPostProcessor

post_processor = container.get(TaskRegistrationPostProcessor)
routes = post_processor.get_task_routes()
# {<bound method send_email>: TaskRoute(), ...}

인증 metadata와 직접 실행

@taskspakky-auth의 보호 decorator와 함께 사용할 수 있습니다. Task route는 보호 요구사항 metadata를 보존하며, 직접 실행은 현재 ApplicationContext의 request-scope 값을 그대로 사용합니다. 같은 프로세스에서 실행되는 task는 AuthContextSnapshot이 필요하지 않고, 보호된 task도 AuthContext를 메서드 인자로 받을 필요가 없습니다.

from spakky.auth import protected, require_auth_context
from spakky.core.pod.interfaces.application_context import IApplicationContext
from spakky.task import DirectTaskExecutor, DirectTaskInvocation, TaskHandler, task


@TaskHandler()
class ReportTaskHandler:
    def __init__(self, application_context: IApplicationContext) -> None:
        self._application_context = application_context

    @task
    @protected
    def generate(self) -> str:
        return require_auth_context(self._application_context).subject.id


application_context: IApplicationContext = ...
executor = DirectTaskExecutor()
executor.set_application_context(application_context)
result = executor.execute(
    DirectTaskInvocation(
        handler_type=ReportTaskHandler,
        method_name="generate",
    )
)

구성 요소

구성 요소 설명
TaskHandler 태스크 핸들러 클래스용 stereotype decorator
@task on-demand 태스크 dispatch용 메서드 decorator
@schedule 주기 실행용 메서드 decorator(interval, at, crontab)
TaskRoute @task 메서드용 annotation
ScheduleRoute @schedule 메서드용 annotation
Crontab cron 유사 schedule 명세용 frozen dataclass
Weekday 요일용 IntEnum(Monday=0 ... Sunday=6)
Month 월용 IntEnum(January=1 ... December=12)
DirectTaskExecutor request-scope context를 유지하는 같은 프로세스 task 실행기
DirectTaskInvocation 직접 실행 대상 handler/method/argument metadata
TaskRegistrationPostProcessor @TaskHandler pod를 스캔하고 @task 메서드를 수집

에러

에러 설명
TaskNotFoundError registry에서 task reference를 찾을 수 없음
DuplicateTaskError 이미 등록된 task를 다시 등록하려는 경우
InvalidScheduleSpecificationError @schedule called with zero or multiple schedule options

관련 패키지

  • spakky-celery: AOP 기반 task dispatch와 schedule 등록을 위한 Celery backend

라이선스

MIT License

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