Add some initial (unfinished) models
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lemoer
parent
3a6de92eee
commit
52112e1df8
394
models.py
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394
models.py
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#!/usr/bin/env python3
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import os
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import enum
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from typing import List
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from pydantic import BaseModel
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from result import Result, Ok, Err, is_ok
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from sqlmodel import Field, Session, SQLModel, create_engine, Relationship, select
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import datetime
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import pytest
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def utc_now():
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return datetime.datetime.now(datetime.timezone.utc)
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class User(SQLModel, table=True):
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id: int = Field(primary_key=True)
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name: str
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joined_at: datetime.datetime = Field(default_factory=utc_now)
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participation_requests: list["ParticipationRequest"] = Relationship(back_populates="user")
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def last_accepted_participation_request(self) -> Result["ParticipationRequest", None]:
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accepted_requests = [r for r in self.participation_requests if r.state == ParticipationState.ACCEPTED]
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if accepted_requests:
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return Ok(max(accepted_requests, key=lambda r: r.requested_at))
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else:
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return Err(None)
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def sort_time(self):
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last_accepted = self.last_accepted_participation_request()
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if is_ok(last_accepted):
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last_accepted_obj = last_accepted.unwrap()
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assert last_accepted_obj.state_since is not None
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return last_accepted_obj.state_since
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else:
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return self.joined_at
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def all_users_sorted(session: Session) -> List[User]:
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users = session.exec(select(User)).all()
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users.sort(key=lambda u: u.sort_time())
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return users
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class Task(SQLModel, table=True):
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id: int = Field(primary_key=True)
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name: str
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required_number_of_participants: int
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due: datetime.datetime
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timeout: int # in seconds
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participation_requests: list["ParticipationRequest"] = Relationship(back_populates="task")
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def accepted_requests(self):
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return [r for r in self.participation_requests if r.state == ParticipationState.ACCEPTED]
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def rejected_requests(self):
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return [r for r in self.participation_requests if r.state == ParticipationState.REJECTED]
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def requested_requests(self):
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return [r for r in self.participation_requests if r.state == ParticipationState.REQUESTED]
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def timeout_requests(self):
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return [r for r in self.participation_requests if r.state == ParticipationState.TIMEOUT]
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def additional_requests_to_be_sent(self):
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# return the number of additional requests to be sent
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return self.required_number_of_participants \
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- len(self.accepted_participation_requests()) \
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- len(self.requested_participation_requests())
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def freshly_expired_requests(self, now) -> List["ParticipationRequest"]:
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expired_requests = []
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for r in self.participation_requests:
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maybe_timeout = r.check_for_timeout(now)
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if maybe_timeout is not None:
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expired_requests.append(r)
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class ParticipationState(enum.Enum):
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REQUESTED = "requested"
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ACCEPTED = "accepted"
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REJECTED = "rejected"
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TIMEOUT = "timeout"
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# Transitions for a ParticipationState:
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#
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# Accepting or rejecting a request within timeout:
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#
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# - REQUESTED -> ACCEPTED (allowed)
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# - REQUESTED -> REJECTED (allowed)
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#
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# Normal timeout:
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#
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# - REQUESTED -> TIMEOUT (allowed, happens automatically after timeout)
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#
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# Changing from ACCEPTED to REJECTED is allowed:
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#
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# - ACCEPTED -> REJECTED (allowed)
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#
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# Changing from REJECTED to ACCEPTED is allowed for 5 minutes only:
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#
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# - REJECTED -> ACCEPTED (allowed, within 5 minutes)
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# - REJECTED -> ACCEPTED (not allowed, after 5 minutes)
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#
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# Answered requests can not timeout:
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#
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# - REJECTED -> TIMEOUT (should not happen, bug)
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# - ACCEPTED -> TIMEOUT (should not happen, bug)
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#
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# Timed out requests can not be
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#
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# TIMEOUT -> ACCEPTED (not allowed)
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# TIMEOUT -> REJECTED (not allowed)
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# TIMEOUT -> REQUESTED (should not happen, bug)
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#
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# => TODO: What should happen after the due?!!!
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class StateTransition:
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pass
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class StateTransitionError:
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pass
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class AcceptInTime(StateTransition):
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pass
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class AcceptAfterRejectAllowed(StateTransition):
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pass
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class AcceptAfterRejectExpired(StateTransitionError):
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pass
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class AcceptAfterTimeout(StateTransitionError):
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pass
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class AlreadyAccepted(StateTransitionError):
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pass
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class RejectInTime(StateTransition):
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pass
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class RejectAfterAccept(StateTransition):
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pass
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class RejectAfterTimeout(StateTransitionError):
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pass
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class AlreadyRejected(StateTransitionError):
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pass
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class Timeout(StateTransition):
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pass
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class ParticipationRequest(SQLModel, table=True):
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id: int = Field(primary_key=True)
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user_id: int = Field(foreign_key="user.id")
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task_id: int = Field(foreign_key="task.id")
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requested_at: datetime.datetime
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state_since: datetime.datetime | None = None
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state: ParticipationState = Field(default=ParticipationState.REQUESTED)
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task: Task = Relationship(back_populates="participation_requests")
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user: User = Relationship(back_populates="participation_requests")
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def _change_state(self, new_state: ParticipationState, now: datetime.datetime):
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# This method does not check any business rules, it just changes the state
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self.state_since = now
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self.state = new_state
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def try_accept(self, now: datetime.datetime) -> Result[AcceptInTime | AcceptAfterRejectAllowed, AcceptAfterRejectExpired | AcceptAfterTimeout | AlreadyAccepted]:
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if self.state == ParticipationState.REQUESTED or self.state == ParticipationState.TIMEOUT:
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# We want to make the order in which check_for_timeout() and try_accept() is called irrelevant
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if self.is_timed_out(now):
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return Err(AcceptAfterTimeout())
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else:
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self._change_state(ParticipationState.ACCEPTED, now)
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return Ok(AcceptInTime())
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elif self.state == ParticipationState.REJECTED:
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if (now - self.state_since).total_seconds() < 5 * 60:
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self._change_state(ParticipationState.ACCEPTED, now)
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return Ok(AcceptAfterRejectAllowed())
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else:
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return Err(AcceptAfterRejectExpired())
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elif self.state == ParticipationState.ACCEPTED:
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return Err(AlreadyAccepted())
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else:
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raise Exception("Unknown old state " + str(self.state) + ".")
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def try_reject(self, now: datetime.datetime) -> Result[RejectInTime, RejectAfterAccept | RejectAfterTimeout]:
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if self.state == ParticipationState.REQUESTED or self.state == ParticipationState.TIMEOUT:
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# We want to make the order in which check_for_timeout() and try_reject() is called irrelevant
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if self.is_timed_out(now):
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return Err(RejectAfterTimeout())
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else:
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self._change_state(ParticipationState.REJECTED, now)
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return Ok(RejectInTime())
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elif self.state == ParticipationState.ACCEPTED:
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self._change_state(ParticipationState.REJECTED, now)
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return Ok(RejectAfterAccept())
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elif self.state == ParticipationState.REJECTED:
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return Err(AlreadyRejected())
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else:
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raise Exception("Unknown old state " + str(self.state) + ".")
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def check_for_timeout(self, now: datetime.datetime) -> Timeout | None:
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if self.state == ParticipationState.REQUESTED:
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if self.is_timed_out(now):
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self._change_state(ParticipationState.TIMEOUT, now)
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return Timeout()
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def is_timed_out(self, now: datetime.datetime) -> bool:
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return (now - self.requested_at).total_seconds() > self.task.timeout
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@pytest.fixture
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def session():
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if os.path.exists("/tmp/test.db"):
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os.remove("/tmp/test.db")
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engine = create_engine("sqlite:////tmp/test.db")
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SQLModel.metadata.create_all(engine)
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with Session(engine) as session:
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yield session
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def test_all_users_sorted(session):
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u1 = User(name="u1")
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u2 = User(name="u2")
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u3 = User(name="u3")
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session.add(u1)
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session.add(u2)
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session.add(u3)
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session.commit()
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users = all_users_sorted(session)
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assert users == [u1, u2, u3]
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t1 = Task(name="t1", required_number_of_participants=2, due=utc_now(), timeout=10)
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session.add(t1)
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session.commit()
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r1 = ParticipationRequest(user=u1, task=t1, requested_at=utc_now())
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session.add(r1)
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session.commit()
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assert t1.accepted_requests() == []
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users = all_users_sorted(session)
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r1._change_state(ParticipationState.ACCEPTED, utc_now())
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session.commit()
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assert t1.accepted_requests() == [r1]
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users = all_users_sorted(session)
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assert users == [u2, u3, u1]
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r2 = ParticipationRequest(user=u2, task=t1, requested_at=utc_now())
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session.add(r2)
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r3 = ParticipationRequest(user=u3, task=t1, requested_at=utc_now())
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session.add(r3)
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session.commit()
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r3._change_state(ParticipationState.ACCEPTED, utc_now())
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session.commit()
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assert t1.accepted_requests() == [r1, r3]
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users = all_users_sorted(session)
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assert users == [u2, u1, u3]
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r2._change_state(ParticipationState.ACCEPTED, utc_now())
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session.commit()
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users = all_users_sorted(session)
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assert users == [u1, u3, u2]
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def test_accept(session):
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now = datetime.datetime(2024, 12, 10, 0, 0)
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dt = datetime.timedelta(days=1)
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u1 = User(name="u1")
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# - Task will happen at now + 10*dt
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# - Each user has 1*dt after the request to answer (before timeout)
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t1 = Task(name="t1", required_number_of_participants=2, due=now + 10*dt, timeout=dt.total_seconds())
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r1 = ParticipationRequest(user=u1, task=t1, requested_at=now)
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session.add(u1)
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session.add(t1)
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session.add(r1)
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session.commit()
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accept_result = r1.try_accept(now + 0.5*dt)
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assert isinstance(accept_result.unwrap(), AcceptInTime)
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session.commit()
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accept_result = r1.try_accept(now + 0.5*dt)
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assert isinstance(accept_result.unwrap_err(), AlreadyAccepted)
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session.commit()
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# Accepted should not timeout
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timeout_result = r1.check_for_timeout(now + 1.6*dt)
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assert timeout_result is None
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r2 = ParticipationRequest(user=u1, task=t1, requested_at=now + 0.5*dt)
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session.add(r2)
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# AcceptAfterTimeout must be given even before check_for_timeout()
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accept_result = r2.try_accept(now + 1.6*dt)
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assert isinstance(accept_result.unwrap_err(), AcceptAfterTimeout)
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assert(r2.state == ParticipationState.REQUESTED)
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# Obtain Timeout
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timeout_result = r2.check_for_timeout(now + 1.6*dt)
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assert isinstance(timeout_result, Timeout)
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# Should still be a AcceptAfterTimeout
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accept_result = r2.try_accept(now + 1.6*dt)
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assert isinstance(accept_result.unwrap_err(), AcceptAfterTimeout)
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assert(r2.state == ParticipationState.TIMEOUT)
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# If we reiceive a late accept, we should accept it
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accept_result = r2.try_accept(now + 0.5*dt)
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assert isinstance(accept_result.unwrap(), AcceptInTime)
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assert(r2.state == ParticipationState.ACCEPTED)
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session.commit()
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def test_reject(session):
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now = datetime.datetime(2024, 12, 10, 0, 0)
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dt = datetime.timedelta(days=1)
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u1 = User(name="u1")
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# - Task will happen at now + 10*dt
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# - Each user has 1*dt after the request to answer (before timeout)
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t1 = Task(name="t1", required_number_of_participants=2, due=now + 10*dt, timeout=dt.total_seconds())
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r1 = ParticipationRequest(user=u1, task=t1, requested_at=now)
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session.add(u1)
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session.add(t1)
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session.add(r1)
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session.commit()
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reject_result = r1.try_reject(now + 0.5*dt)
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assert isinstance(reject_result.unwrap(), RejectInTime)
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session.commit()
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reject_result = r1.try_reject(now + 0.5*dt)
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assert isinstance(reject_result.unwrap_err(), AlreadyRejected)
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session.commit()
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r2 = ParticipationRequest(user=u1, task=t1, requested_at=now + 0.5*dt)
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session.add(r2)
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# RejectAfterTimeout must be given even before check_for_timeout()
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reject_result = r2.try_reject(now + 1.6*dt)
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assert isinstance(reject_result.unwrap_err(), RejectAfterTimeout)
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assert(r2.state == ParticipationState.REQUESTED)
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# Obtain Timeout
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timeout_result = r2.check_for_timeout(now + 1.6*dt)
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assert isinstance(timeout_result, Timeout)
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assert(r2.state == ParticipationState.TIMEOUT)
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# Should still be a RejectAfterTimeout
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reject_result = r2.try_reject(now + 1.6*dt)
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assert isinstance(reject_result.unwrap_err(), RejectAfterTimeout)
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# If we receive a late reject, we should accept it
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reject_result = r2.try_reject(now + 0.5*dt)
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assert isinstance(reject_result.unwrap(), RejectInTime)
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assert(r2.state == ParticipationState.REJECTED)
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session.commit()
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