276 lines
10 KiB
Python
276 lines
10 KiB
Python
import json
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import logging
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import random
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import threading
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from datetime import UTC, datetime, timedelta
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from uuid import uuid4
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from zoneinfo import ZoneInfo
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from croniter import croniter
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from pigway_frame_flow.errors import ErrorCode as E
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from pigway_frame_flow.errors import FlowError
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from pigway_frame_flow.models import (
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DisplayRequest,
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ImageContent,
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JobInput,
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Options,
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PlaylistInput,
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RestoreContent,
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)
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from pigway_frame_flow.storage.database import encode, now_iso
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def next_run(schedule, after=None):
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after = after or datetime.now(UTC)
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if schedule.type in ("date", "temporary"):
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if not schedule.at or schedule.at.tzinfo is None:
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raise FlowError(E.INVALID_REQUEST, "One-time date must include timezone")
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return schedule.at.astimezone(UTC).isoformat() if schedule.at > after else None
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if schedule.type == "cron":
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expression = schedule.cron or ""
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if len(expression.split()) != 5 or not croniter.is_valid(expression):
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raise FlowError(E.INVALID_REQUEST, "Cron requires five valid fields")
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else:
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if not schedule.time:
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raise FlowError(E.INVALID_REQUEST, "Daily schedule requires HH:MM")
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hour, minute = schedule.time.split(":")
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day = (
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"1-5"
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if schedule.type == "weekdays"
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else ("6,0" if schedule.type == "weekends" else "*")
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)
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expression = f"{minute} {hour} * * {day}"
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return (
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croniter(expression, after.astimezone(ZoneInfo("Asia/Shanghai")))
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.get_next(datetime)
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.astimezone(UTC)
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.isoformat()
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)
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class Scheduler:
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def __init__(self, service):
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self.service, self.db = service, service.db
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self.stop_event = threading.Event()
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self.thread = None
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self.tick_lock = threading.Lock()
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def jobs(self):
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rows = [
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dict(
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json.loads(x["payload"]),
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id=x["id"],
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created_at=x["created_at"],
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updated_at=x["updated_at"],
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last_run=x["last_run"],
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last_result=x["last_result"],
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next_run=x["next_run"],
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)
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for x in self.db.all("SELECT * FROM jobs ORDER BY created_at DESC")
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]
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for row in rows:
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if row["last_result"]:
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operation = self.db.one(
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"SELECT status FROM operations WHERE id=?", (row["last_result"],)
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)
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if operation:
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row["last_result"] = operation["status"]
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return rows
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def save_job(self, job, id=None):
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self.service.registry.get(job.device_id)
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if job.source.type != "restore":
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self.service.validate(
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DisplayRequest(device_id=job.device_id, content=job.source),
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writing=False,
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)
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upcoming = next_run(job.schedule)
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if job.enabled and upcoming is None:
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raise FlowError(E.INVALID_REQUEST, "One-time task must be in the future")
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id = id or uuid4().hex
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now = now_iso()
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self.db.execute(
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"INSERT INTO jobs(id,payload,enabled,next_run,created_at,updated_at) VALUES(?,?,?,?,?,?) ON CONFLICT(id) DO UPDATE SET payload=excluded.payload,enabled=excluded.enabled,next_run=excluded.next_run,updated_at=excluded.updated_at",
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(
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id,
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encode(self.service.settings.sanitize(job.model_dump(mode="json"))),
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int(job.enabled),
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upcoming,
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now,
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now,
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),
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)
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return next(x for x in self.jobs() if x["id"] == id)
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def playlists(self):
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return [
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dict(
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json.loads(x["payload"]),
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id=x["id"],
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position=x["position"],
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next_run=x["next_run"],
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)
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for x in self.db.all("SELECT * FROM playlists")
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]
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def save_playlist(self, playlist, id=None):
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self.service.registry.get(playlist.device_id)
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for existing in self.playlists():
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if (
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existing["enabled"]
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and playlist.enabled
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and existing["device_id"] == playlist.device_id
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and existing["id"] != id
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):
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raise FlowError(
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E.CONFLICT, "Only one Frame Flow playlist may run per device", 409
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)
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id = id or uuid4().hex
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self.db.execute(
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"INSERT INTO playlists VALUES(?,?,?,?) ON CONFLICT(id) DO UPDATE SET payload=excluded.payload,next_run=excluded.next_run",
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(
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id,
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encode(playlist.model_dump()),
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-1,
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now_iso() if playlist.enabled else None,
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),
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)
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return next(x for x in self.playlists() if x["id"] == id)
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def tick(self, current=None):
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current = current or datetime.now(UTC)
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with self.tick_lock:
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for row in self.db.all(
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"SELECT * FROM jobs WHERE enabled=1 AND next_run<=?",
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(current.isoformat(),),
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):
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job = JobInput.model_validate_json(row["payload"])
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slot = row["next_run"]
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if self.db.one(
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"SELECT * FROM job_runs WHERE job_id=? AND scheduled_at=?",
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(row["id"], slot),
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):
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continue
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# Skip overdue tasks (>5 minutes): avoid an unexpected artwork
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# overwrite after downtime. One-time tasks are retired too.
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late = (current - datetime.fromisoformat(slot)).total_seconds() > 300
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operation_id = None
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if not late:
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action = "restore" if job.source.type == "restore" else "display"
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payload = (
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{}
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if isinstance(job.source, RestoreContent)
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else DisplayRequest(
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device_id=job.device_id,
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content=job.source,
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options=Options(
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duration=job.display_duration,
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restore_previous=job.restore_previous,
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priority=job.priority,
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cleanup_unstarred=job.cleanup_unstarred,
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),
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).model_dump(mode="json")
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)
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operation_id = self.service.submit(
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action,
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payload,
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job.device_id,
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"scheduler",
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"schedule-" + uuid4().hex,
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"job-" + row["id"] + "-" + slot,
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)
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following = next_run(job.schedule, current)
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enabled = bool(following)
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updated = job.model_copy(update={"enabled": enabled}).model_dump(
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mode="json"
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)
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with self.db.transaction() as tx:
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tx.execute(
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"INSERT OR IGNORE INTO job_runs VALUES(?,?,?)",
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(row["id"], slot, operation_id),
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)
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tx.execute(
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"UPDATE jobs SET payload=?,enabled=?,next_run=?,last_run=?,last_result=? WHERE id=?",
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(
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encode(updated),
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int(enabled),
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following,
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now_iso(),
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"SKIPPED_OVERDUE" if late else operation_id,
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row["id"],
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),
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)
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for row in self.db.all(
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"SELECT * FROM playlists WHERE next_run<=?", (current.isoformat(),)
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):
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p = PlaylistInput.model_validate_json(row["payload"])
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if (
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not p.enabled
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or self.service.top(p.device_id)
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or self.service.blocked(p.device_id)
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):
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continue
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if (
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not self.service.settings.mock
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and not self.service.settings.write_enabled
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):
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continue
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pos = (
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random.randrange(len(p.image_ids))
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if p.mode == "random"
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else (row["position"] + 1) % len(p.image_ids)
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)
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request = DisplayRequest(
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device_id=p.device_id,
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content=ImageContent(type="image", image_id=p.image_ids[pos]),
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options=Options(priority=0),
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)
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self.service.submit(
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"display",
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request.model_dump(mode="json"),
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p.device_id,
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"scheduler",
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"playlist-" + uuid4().hex,
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"playlist-" + row["id"] + "-" + row["next_run"],
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)
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following = (
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current + timedelta(minutes=p.interval_minutes)
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).isoformat()
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self.db.execute(
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"UPDATE playlists SET position=?,next_run=? WHERE id=?",
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(pos, following, row["id"]),
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)
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def start(self):
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self.thread = threading.Thread(
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target=self.run, name="frame-flow-worker", daemon=True
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)
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self.thread.start()
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def run(self):
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while not self.stop_event.is_set():
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try:
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self.tick()
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self.service.expire()
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self.service.cloud_library.sweep()
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processed = self.service.process_one()
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self.service.sync()
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except Exception:
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logging.getLogger("frame-flow").error(
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"Background cycle failed; details suppressed"
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)
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processed = False
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self.stop_event.wait(1 if processed else 5)
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def stop(self):
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self.stop_event.set()
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if self.thread:
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self.thread.join(timeout=45)
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def healthy(self):
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return bool(
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self.thread and self.thread.is_alive() and not self.stop_event.is_set()
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)
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