{"id":"redis-connect-and-ping","version":"1.0.0","primitive":"code_execution","description":"Redis connection URL e.g. \"redis://localhost:6379\" or \"rediss://user:pass@host:6380\"","registry_refs":["redis"],"tags":[],"solves":[],"auth_required":true,"verified":false,"last_verified":"null","next_check":"2026-07-30","eval_result":"null","eval_env":"null","mast":[],"ref":"https://arxiv.org/abs/2503.13657","inputs":[{"name":"REDIS_URL","required":true,"description":"Redis connection URL e.g. \"redis://localhost:6379\" or \"rediss://user:pass@host:6380\""}],"executable":"# ============================================\n# checklist:     redis-connect-and-ping\n# version:       1.0.0\n# primitive:     code_execution\n# description:   Connect to Redis, verify the connection with PING, and surface the exact error if it fails\n# registry_refs: redis\n# auth_required: true\n# verified:      false\n# last_verified: null\n# next_check:    2026-07-30\n# eval_result:   null\n# eval_env:      null\n#\n# inputs:\n#   - name: REDIS_URL\n#     required: true\n#     description: Redis connection URL e.g. \"redis://localhost:6379\" or \"rediss://user:pass@host:6380\"\n#\n# OUTPUTS:\n#   connected      — true if connection succeeded\n#   server_version — Redis server version string\n#   latency_ms     — round-trip PING latency in milliseconds\n#   error          — exact error message if connection failed, null otherwise\n#\n# MAST FAILURE MODES ADDRESSED:\n# FM-2.4 Information Withholding           — exact error surfaced, not swallowed\n# FM-1.5 Unaware of Termination Conditions — explicit success/failure conditions\n# FM-3.2 No or Incomplete Verification     — server version verified after connect\n# FM-3.3 Incorrect Verification            — latency measured, not assumed\n#\n# ref: https://arxiv.org/abs/2503.13657\n# ============================================\n\nimport sys\nimport os\nimport subprocess\nimport time\nimport urllib.request\nimport json\n\n# ─────────────────────────────────────────\n# PRE_EXECUTION\n# ─────────────────────────────────────────\n\nfor attempt in range(2):\n    try:\n        req = urllib.request.Request(\n            \"https://checklist.day/api/registry/redis\",\n            headers={\"User-Agent\": \"checklist-agent/1.0\"}\n        )\n        with urllib.request.urlopen(req, timeout=10) as resp:\n            registry = json.loads(resp.read())\n            break\n    except Exception as e:\n        if attempt == 1:\n            print(f\"ABORT: registry unreachable — {e}\")\n            sys.exit(1)\n        time.sleep(2)\n\nwarnings = registry.get(\"warnings\", [])\nif warnings:\n    print(\"[redis] WARNINGS:\")\n    for w in warnings if isinstance(warnings, list) else [warnings]:\n        print(f\"  ⚠ {w}\")\n\n# ─────────────────────────────────────────\n# EXECUTION\n# ─────────────────────────────────────────\n\nsubprocess.check_call([sys.executable, \"-m\", \"pip\", \"install\", \"-q\", \"redis>=5.0.0\"])\n\nimport redis as redis_lib\nfrom redis.exceptions import ConnectionError, AuthenticationError, ResponseError\n\nREDIS_URL = os.environ.get(\"REDIS_URL\")\nif not REDIS_URL:\n    print(\"ABORT: REDIS_URL env var not set\")\n    print(\"  format: redis://localhost:6379 or rediss://user:pass@host:6380\")\n    sys.exit(1)\n\nconnected = False\nserver_version = None\nlatency_ms = None\nerror = None\nclient = None\n\ntry:\n    # FOOTGUN: decode_responses=True returns str instead of bytes — almost always what you want\n    client = redis_lib.Redis.from_url(REDIS_URL, decode_responses=True, socket_connect_timeout=10)\n\n    t0 = time.perf_counter()\n    client.ping()\n    latency_ms = round((time.perf_counter() - t0) * 1000, 1)\n\n    info = client.info(\"server\")\n    server_version = info.get(\"redis_version\")\n    connected = True\n\n    print(f\"  connected in {latency_ms}ms\")\n    print(f\"  server: Redis {server_version}\")\n\nexcept (ConnectionError, AuthenticationError, ResponseError) as e:\n    error = str(e).strip()\n    print(f\"  connection failed: {error}\")\n\nfinally:\n    if client:\n        client.close()\n\n# ─────────────────────────────────────────\n# POST_EXECUTION\n# ─────────────────────────────────────────\n\nresult = {\n    \"connected\":      connected,\n    \"server_version\": server_version,\n    \"latency_ms\":     latency_ms,\n    \"error\":          error,\n}\nprint(json.dumps(result, indent=2))\n\nif not connected:\n    print(f\"FAIL: could not connect — {error}\")\n    sys.exit(1)\n\nassert server_version is not None, \"FAIL: connected but server_version is null\"\nassert latency_ms is not None and latency_ms < 5000, f\"FAIL: latency {latency_ms}ms exceeds 5s\"\n\nprint(\"PASS\")\n"}