校园跑腿系统如何匹配本校：用配置快照检查错校区与停用点

from dataclasses import dataclass
from typing import FrozenSet

@dataclass(frozen=True)
class Snapshot:
    campus: str
    revision: int
    active_locations: FrozenSet[str]
    allowed_riders: FrozenSet[str]

def check_task(snapshot, task, expected_revision):
    required = {"campus", "pickup", "dropoff", "rider", "authorized"}
    if set(task) != required:
        return "INVALID_FIELDS"
    if type(expected_revision) is not int or expected_revision != snapshot.revision:
        return "STALE_CONFIG"
    if task["campus"] != snapshot.campus:
        return "CAMPUS_MISMATCH"
    if not all(isinstance(task[key], str) and task[key]
               for key in ("campus", "pickup", "dropoff", "rider")):
        return "INVALID_FIELDS"
    if task["authorized"] is not True:
        return "MISSING_AUTHORIZATION"
    if task["pickup"] not in snapshot.active_locations:
        return "PICKUP_UNAVAILABLE"
    if task["dropoff"] not in snapshot.active_locations:
        return "DROPOFF_UNAVAILABLE"
    if task["rider"] not in snapshot.allowed_riders:
        return "RIDER_OUT_OF_SCOPE"
    return "READY_FOR_DEMO"

if __name__ == "__main__":
    snapshot = Snapshot("SOUTH", 3, frozenset({"GATE", "A"}), frozenset({"R1"}))
    task = dict(campus="SOUTH", pickup="GATE", dropoff="A", rider="R1", authorized=True)
    cases = [(task, 3, "READY_FOR_DEMO"),
             (dict(task, campus="NORTH"), 3, "CAMPUS_MISMATCH"),
             (dict(task, pickup="CLOSED"), 3, "PICKUP_UNAVAILABLE"),
             (dict(task, dropoff="CLOSED"), 3, "DROPOFF_UNAVAILABLE"),
             (dict(task, rider="R2"), 3, "RIDER_OUT_OF_SCOPE"),
             (dict(task, authorized=False), 3, "MISSING_AUTHORIZATION"),
             (task, 2, "STALE_CONFIG"),
             (dict(task, extra="unexpected"), 3, "INVALID_FIELDS")]
    for supplied, revision, expected in cases:
        actual = check_task(snapshot, supplied, revision)
        assert actual == expected, (actual, expected)
        print(actual)