279 lines
12 KiB
Python
279 lines
12 KiB
Python
"""Per-camera recovery intent. No SDK ownership, recording replay or BLE access."""
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import copy
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import hashlib
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import json
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import threading
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import time
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import uuid
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from concurrent.futures import ThreadPoolExecutor
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from datetime import UTC, datetime, timedelta
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from pathlib import Path
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from .http import request
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from .operations import Operations, atomic
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HELPER = Path("/run/mission-core-x4-recovery/driver.sock")
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class Recovery:
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def __init__(self, broker, root):
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self.broker, self.root = broker, root
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self.root.mkdir(mode=0o700, parents=True, exist_ok=True)
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self.lock = threading.RLock()
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self.states = {}
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self.current = {}
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self.absent = {}
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self.stable = {}
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self.jobs = {}
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self.stopping = threading.Event()
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self.pool = ThreadPoolExecutor(max_workers=2, thread_name_prefix="x4-recovery")
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for path in sorted(root.glob("instax4_*.json"))[:500]:
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state = json.loads(path.read_text())
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self.broker.validate_identifier(path.stem)
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self.states[path.stem] = state
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def default(self):
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now = datetime.now(UTC).isoformat()
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return {
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"enabled": False,
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"preview_wanted": False,
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"attempts": 0,
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"phase": "disabled",
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"session_id": "x4_recovery_" + uuid.uuid4().hex,
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"opened_at": now,
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"updated_at": now,
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"revision": 1,
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"resume_session": None,
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"last_preview_request": "",
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"last_preview_id": "",
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}
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def save(self, ident, state):
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state["revision"] += 1
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state["updated_at"] = datetime.now(UTC).isoformat()
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atomic(self.root / (ident + ".json"), state)
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def view(self, ident):
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with self.lock:
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state = self.states.get(ident, {})
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return {
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"supported": True,
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"enabled": state.get("enabled", False),
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"preview_wanted": state.get("preview_wanted", False),
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"phase": state.get("phase", "disabled"),
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}
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def snapshot(self, ident):
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with self.lock:
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current = self.current.get(ident)
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if current is not None:
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return copy.deepcopy(current)
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state = self.states.get(ident)
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if state is None:
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raise ValueError("Camera identity is unavailable")
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return {
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"id": ident,
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"session_id": state["session_id"],
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"opened_at": state["opened_at"],
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"observed_at": state["updated_at"],
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"revision": state["revision"],
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"prepared": True,
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"verified": False,
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"online": False,
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"preparation_safe": False,
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"status": {},
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"message": None,
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}
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def augment(self, snapshots):
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values = {x["id"]: copy.deepcopy(x) for x in snapshots}
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with self.lock:
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for ident in self.states:
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if ident not in values:
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values[ident] = self.snapshot(ident)
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# Never retain an online snapshot when its worker disappeared.
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values[ident].update(online=False, status={}, preparation_safe=False)
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for ident, value in values.items():
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value["status"]["recovery"] = self.view(ident)
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return list(values.values())
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def configure(self, ident, enabled):
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# Called under the camera capture lock, also used by preview restoration.
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reply = request(HELPER, "/control", {"device_id": ident, "enabled": enabled}, timeout=8)
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if reply.get("enabled") is not enabled:
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raise RuntimeError("Recovery setting was not confirmed")
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with self.lock:
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state = self.states.setdefault(ident, self.default())
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state.update(enabled=enabled, attempts=0, phase="ready" if enabled else "disabled")
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if not enabled:
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state["preview_wanted"] = False
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current = self.current.get(ident)
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if current:
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state.update(session_id=current["session_id"], opened_at=current["opened_at"])
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if enabled:
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state["preview_wanted"] = current.get("status", {}).get("preview") == 1
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self.save(ident, state)
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self.absent.pop(ident, None)
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return {"state": "complete", "result": self.view(ident)}
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def operation(self, ident, command):
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with self.broker.capture_lock(ident):
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snapshot = self.snapshot(ident)
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operations = Operations(
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ident,
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snapshot["session_id"],
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self.root / ident / "operations",
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RecoveryCalls(self, ident, command),
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)
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return operations.execute(command)
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def preview_intent(self, ident, command, result):
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start = command["action_id"] == "preview.start"
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if start and result.get("state") != "complete":
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return
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with self.lock:
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state = self.states.setdefault(ident, self.default())
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requested = datetime.fromisoformat(command["requested_at"])
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previous = state["last_preview_request"]
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if command["operation_id"] == state["last_preview_id"] or (
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previous and requested <= datetime.fromisoformat(previous)
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):
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return
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state.update(
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preview_wanted=start,
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last_preview_request=command["requested_at"],
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last_preview_id=command["operation_id"],
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)
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self.save(ident, state)
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def observe(self, snapshots, now):
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"""Pure scheduling decisions under one short lock; no device calls here."""
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self.current = {x["id"]: copy.deepcopy(x) for x in snapshots}
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decisions = []
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for ident, state in self.states.items():
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current = self.current.get(ident)
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online = bool(current and current.get("online"))
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if online:
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self.absent.pop(ident, None)
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self.stable.setdefault(ident, now)
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if state["session_id"] != current["session_id"]:
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state.update(session_id=current["session_id"], opened_at=current["opened_at"])
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self.save(ident, state)
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if now - self.stable[ident] >= 60 and state["attempts"]:
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state["attempts"] = 0
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self.save(ident, state)
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if (
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state["enabled"]
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and state["preview_wanted"]
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and state["resume_session"] != current["session_id"]
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and current.get("status", {}).get("preview") == 0
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and current.get("status", {}).get("recording") == 0
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):
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decisions.append((ident, "preview"))
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else:
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self.stable.pop(ident, None)
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since = self.absent.setdefault(ident, now)
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if (
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state["enabled"]
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and state["attempts"] < 3
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and now - since >= (8, 40, 100)[state["attempts"]]
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):
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decisions.append((ident, "wake"))
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return decisions
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def work(self, ident, kind):
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if kind == "preview":
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# Serialize restore with user START/STOP/configure for this camera only.
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with self.broker.capture_lock(ident):
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with self.lock:
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state = self.states[ident]
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current = self.current.get(ident)
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if not state["enabled"] or not state["preview_wanted"] or not current:
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return
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session = current["session_id"]
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if state["resume_session"] == session:
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return
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state.update(resume_session=session, phase="restoring_preview")
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self.save(ident, state)
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now = datetime.now(UTC)
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operation = (
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"op_" + hashlib.sha256((ident + session + "restore").encode()).hexdigest()[:32]
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)
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command = {
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"api_version": "missioncore.nodedc/plugin-sdk/v0alpha2",
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"kind": "OperationRequest",
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"operation_id": operation,
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"idempotency_key": operation,
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"session": {"device_id": ident, "session_id": session},
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"action_id": "preview.start",
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"parameters": {},
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"requested_at": now.isoformat(),
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"deadline_at": (now + timedelta(seconds=60)).isoformat(),
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}
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result = self.broker.capture_operation(ident, command, restoring=True)
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with self.lock:
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state["phase"] = (
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"ready" if result.get("state") == "complete" else "preview_failed"
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)
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self.save(ident, state)
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else:
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with self.lock:
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state = self.states[ident]
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if not state["enabled"] or state["attempts"] >= 3:
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return
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state["attempts"] += 1
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state["phase"] = "waking"
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self.save(ident, state)
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result = request(
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HELPER, "/wake", {"device_id": ident, "attempt": uuid.uuid4().hex}, timeout=52
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)
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with self.lock:
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state = self.states[ident]
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if state["enabled"]:
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if result.get("state") == "busy":
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state["attempts"] -= 1
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state["phase"] = (
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"ready"
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if result.get("state") == "connected"
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else "exhausted"
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if state["attempts"] >= 3
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else "waiting"
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)
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self.save(ident, state)
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def loop(self):
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while not self.stopping.wait(2):
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try:
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snapshots = self.broker.snapshots()
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with self.lock:
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for ident, future in list(self.jobs.items()):
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if future.done():
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if future.exception():
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state = self.states[ident]
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state["phase"] = "unavailable" if state["enabled"] else "disabled"
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self.save(ident, state)
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del self.jobs[ident]
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for ident, kind in self.observe(snapshots, time.monotonic()):
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if ident not in self.jobs and len(self.jobs) < 2:
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self.jobs[ident] = self.pool.submit(self.work, ident, kind)
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except (OSError, ValueError, RuntimeError, KeyError):
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# No wake is inferred from failed model-wide inventory sampling.
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continue
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def start(self):
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threading.Thread(target=self.loop, name="x4-recovery", daemon=True).start()
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class RecoveryCalls:
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def __init__(self, recovery, ident, command):
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self.recovery, self.ident, self.command = recovery, ident, command
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def call(self, action, params):
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if action == "recovery.configure":
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return self.recovery.configure(self.ident, params["enabled"])
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if action == "preview.stop":
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self.recovery.preview_intent(self.ident, self.command, {"state": "complete"})
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return {"state": "complete", "result": {"preview_wanted": False}}
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raise ValueError("Unsupported recovery action")
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