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from __future__ import annotations
from datetime import datetime, timedelta, timezone
from functools import partial
from typing import Any, Callable
from uuid import UUID, uuid4
import attrs
import tenacity.stop
import tenacity.wait
from attrs.validators import instance_of
from . import abc
from ._converters import as_enum, as_timedelta
from .enums import CoalescePolicy, JobOutcome
from .marshalling import callable_from_ref, callable_to_ref
def serialize(inst, field, value):
if isinstance(value, frozenset):
return list(value)
return value
@attrs.define(kw_only=True)
class Task:
id: str
func: Callable = attrs.field(eq=False, order=False)
max_running_jobs: int | None = attrs.field(eq=False, order=False, default=None)
misfire_grace_time: timedelta | None = attrs.field(
eq=False, order=False, default=None
)
state: Any = None
def marshal(self, serializer: abc.Serializer) -> dict[str, Any]:
marshalled = attrs.asdict(self, value_serializer=serialize)
marshalled["func"] = callable_to_ref(self.func)
marshalled["state"] = serializer.serialize(self.state) if self.state else None
return marshalled
@classmethod
def unmarshal(cls, serializer: abc.Serializer, marshalled: dict[str, Any]) -> Task:
marshalled["func"] = callable_from_ref(marshalled["func"])
if marshalled["state"] is not None:
marshalled["state"] = serializer.deserialize(marshalled["state"])
return cls(**marshalled)
@attrs.define(kw_only=True)
class Schedule:
id: str
task_id: str = attrs.field(eq=False, order=False)
trigger: abc.Trigger = attrs.field(eq=False, order=False)
args: tuple = attrs.field(eq=False, order=False, converter=tuple, default=())
kwargs: dict[str, Any] = attrs.field(
eq=False, order=False, converter=dict, default=()
)
coalesce: CoalescePolicy = attrs.field(
eq=False,
order=False,
default=CoalescePolicy.latest,
converter=as_enum(CoalescePolicy),
)
misfire_grace_time: timedelta | None = attrs.field(
eq=False, order=False, default=None, converter=as_timedelta
)
max_jitter: timedelta | None = attrs.field(
eq=False, order=False, converter=as_timedelta, default=None
)
tags: frozenset[str] = attrs.field(
eq=False, order=False, converter=frozenset, default=()
)
next_fire_time: datetime | None = attrs.field(eq=False, order=False, default=None)
last_fire_time: datetime | None = attrs.field(eq=False, order=False, default=None)
acquired_by: str | None = attrs.field(eq=False, order=False, default=None)
acquired_until: datetime | None = attrs.field(eq=False, order=False, default=None)
def marshal(self, serializer: abc.Serializer) -> dict[str, Any]:
marshalled = attrs.asdict(self, value_serializer=serialize)
marshalled["trigger"] = serializer.serialize(self.trigger)
marshalled["args"] = serializer.serialize(self.args)
marshalled["kwargs"] = serializer.serialize(self.kwargs)
if not self.acquired_by:
del marshalled["acquired_by"]
del marshalled["acquired_until"]
return marshalled
@classmethod
def unmarshal(
cls, serializer: abc.Serializer, marshalled: dict[str, Any]
) -> Schedule:
marshalled["trigger"] = serializer.deserialize(marshalled["trigger"])
marshalled["args"] = serializer.deserialize(marshalled["args"])
marshalled["kwargs"] = serializer.deserialize(marshalled["kwargs"])
return cls(**marshalled)
@property
def next_deadline(self) -> datetime | None:
if self.next_fire_time and self.misfire_grace_time:
return self.next_fire_time + self.misfire_grace_time
return None
@attrs.define(kw_only=True)
class Job:
id: UUID = attrs.field(factory=uuid4)
task_id: str = attrs.field(eq=False, order=False)
args: tuple = attrs.field(eq=False, order=False, converter=tuple, default=())
kwargs: dict[str, Any] = attrs.field(
eq=False, order=False, converter=dict, default=()
)
schedule_id: str | None = attrs.field(eq=False, order=False, default=None)
scheduled_fire_time: datetime | None = attrs.field(
eq=False, order=False, default=None
)
jitter: timedelta = attrs.field(
eq=False, order=False, converter=as_timedelta, factory=timedelta
)
start_deadline: datetime | None = attrs.field(eq=False, order=False, default=None)
tags: frozenset[str] = attrs.field(
eq=False, order=False, converter=frozenset, default=()
)
created_at: datetime = attrs.field(
eq=False, order=False, factory=partial(datetime.now, timezone.utc)
)
started_at: datetime | None = attrs.field(eq=False, order=False, default=None)
acquired_by: str | None = attrs.field(eq=False, order=False, default=None)
acquired_until: datetime | None = attrs.field(eq=False, order=False, default=None)
@property
def original_scheduled_time(self) -> datetime | None:
"""The scheduled time without any jitter included."""
if self.scheduled_fire_time is None:
return None
return self.scheduled_fire_time - self.jitter
def marshal(self, serializer: abc.Serializer) -> dict[str, Any]:
marshalled = attrs.asdict(self, value_serializer=serialize)
marshalled["args"] = serializer.serialize(self.args)
marshalled["kwargs"] = serializer.serialize(self.kwargs)
if not self.acquired_by:
del marshalled["acquired_by"]
del marshalled["acquired_until"]
return marshalled
@classmethod
def unmarshal(cls, serializer: abc.Serializer, marshalled: dict[str, Any]) -> Job:
marshalled["args"] = serializer.deserialize(marshalled["args"])
marshalled["kwargs"] = serializer.deserialize(marshalled["kwargs"])
return cls(**marshalled)
@attrs.define(kw_only=True)
class JobInfo:
job_id: UUID
task_id: str
schedule_id: str | None
scheduled_fire_time: datetime | None
jitter: timedelta
start_deadline: datetime | None
tags: frozenset[str]
@classmethod
def from_job(cls, job: Job) -> JobInfo:
return cls(
job_id=job.id,
task_id=job.task_id,
schedule_id=job.schedule_id,
scheduled_fire_time=job.scheduled_fire_time,
jitter=job.jitter,
start_deadline=job.start_deadline,
tags=job.tags,
)
@attrs.define(kw_only=True, frozen=True)
class JobResult:
job_id: UUID
outcome: JobOutcome = attrs.field(
eq=False, order=False, converter=as_enum(JobOutcome)
)
finished_at: datetime = attrs.field(
eq=False, order=False, factory=partial(datetime.now, timezone.utc)
)
exception: BaseException | None = attrs.field(eq=False, order=False, default=None)
return_value: Any = attrs.field(eq=False, order=False, default=None)
def marshal(self, serializer: abc.Serializer) -> dict[str, Any]:
marshalled = attrs.asdict(self, value_serializer=serialize)
if self.outcome is JobOutcome.error:
marshalled["exception"] = serializer.serialize(self.exception)
else:
del marshalled["exception"]
if self.outcome is JobOutcome.success:
marshalled["return_value"] = serializer.serialize(self.return_value)
else:
del marshalled["return_value"]
return marshalled
@classmethod
def unmarshal(
cls, serializer: abc.Serializer, marshalled: dict[str, Any]
) -> JobResult:
if marshalled.get("exception"):
marshalled["exception"] = serializer.deserialize(marshalled["exception"])
elif marshalled.get("return_value"):
marshalled["return_value"] = serializer.deserialize(
marshalled["return_value"]
)
return cls(**marshalled)
@attrs.define(kw_only=True, frozen=True)
class RetrySettings:
stop: tenacity.stop.stop_base = attrs.field(
validator=instance_of(tenacity.stop.stop_base),
default=tenacity.stop_after_delay(60),
)
wait: tenacity.wait.wait_base = attrs.field(
validator=instance_of(tenacity.wait.wait_base),
default=tenacity.wait_exponential(min=0.5, max=20),
)
@classmethod
def fail_immediately(cls) -> RetrySettings:
return cls(stop=tenacity.stop_after_attempt(1))
|
