Oskar Kapala
c255a021d1
Was: malformed event (bad JSON / truncated / corrupted bytes) wedged the node's checkpoint forever — every cycle re-tried, logged, never advanced past the bad file; all subsequent good events for that node lost. Now: first parse failure -> atomic os.replace to STATE_DIR/observer_failed_events/<node>/ with collision handling. Checkpoint advances, downstream events flow. Move failures themselves are logged but don't crash the loop. Complementary to yesterday's atomic_write_json fix (state files); this addresses the same race-pattern on event files instead. Regression test asserts: bad event quarantined to failed_events dir, removed from hot path, subsequent good event processed (node online), checkpoint moves to good event.
547 lines
24 KiB
Python
547 lines
24 KiB
Python
import os
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import json
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import time
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import glob
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import logging
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import yaml
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from datetime import datetime, timezone
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from pathlib import Path
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def _atomic_write_json(path: Path, data) -> None:
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"""Write JSON atomically: write to a sibling .tmp, fsync, then os.replace."""
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tmp = path.with_suffix(".tmp")
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with open(tmp, "w") as f:
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json.dump(data, f, indent=2)
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f.flush()
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os.fsync(f.fileno())
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os.replace(tmp, path)
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def _parse_ts(ts) -> float:
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"""Return a Unix timestamp float from ts, which may be int/float or an ISO-8601 string.
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Events from node-agent use int(time.time()); events from stability-agent / events.py
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use ISO format ('2026-06-03T10:30:00Z'). Both appear in incident fields such as
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last_occurrence and resolved_at, so any arithmetic on them must go through here.
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Returns 0.0 on None or unparseable input so callers can use plain comparisons.
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"""
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if ts is None:
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return 0.0
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if isinstance(ts, (int, float)):
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return float(ts)
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try:
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return datetime.fromisoformat(str(ts).replace("Z", "+00:00")).timestamp()
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except Exception:
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return 0.0
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# Constants and Paths
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RUNTIME_PATH = os.getenv("RUNTIME_PATH", "/opt/homelab")
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EVENTS_DIR = Path(RUNTIME_PATH) / "events"
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STATE_DIR = Path(RUNTIME_PATH) / "state"
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LOGS_DIR = Path(RUNTIME_PATH) / "logs"
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WORLD_DIR = Path(RUNTIME_PATH) / "world"
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OBSERVER_STATE_FILE = STATE_DIR / "observer_checkpoint.json"
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FAILED_EVENTS_DIR = STATE_DIR / "observer_failed_events"
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REPO_ROOT = Path(__file__).parent.parent.parent
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INVENTORY_TOPOLOGY = REPO_ROOT / "inventory" / "topology.yaml"
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# Logging setup
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logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
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logger = logging.getLogger("observer")
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class Observer:
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def __init__(self):
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# Per-node-directory checkpoint: {"vps": "last/file/path", "piha": "last/file/path"}
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# Replaces the old single last_processed_file which silently skipped event dirs
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# that sort alphabetically before the checkpoint (e.g. piha/ < vps/).
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self.node_checkpoints: dict = {}
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self.world_state = {
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"nodes": {},
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"services": {},
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"deployments": {},
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"incidents": {},
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"summary": {
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"last_update": datetime.now(timezone.utc).isoformat(),
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"status": "initializing",
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"active_incidents_count": 0
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}
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}
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self.inventory = self._load_inventory()
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self._ensure_dirs()
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self._load_checkpoint()
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def _ensure_dirs(self):
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WORLD_DIR.mkdir(parents=True, exist_ok=True)
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STATE_DIR.mkdir(parents=True, exist_ok=True)
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EVENTS_DIR.mkdir(parents=True, exist_ok=True)
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LOGS_DIR.mkdir(parents=True, exist_ok=True)
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FAILED_EVENTS_DIR.mkdir(parents=True, exist_ok=True)
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def _quarantine_event_file(self, file_path: str, node_dir: str, exc: Exception) -> None:
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"""Move an unreadable/unprocessable event out of the hot path."""
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src = Path(file_path)
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dest_dir = FAILED_EVENTS_DIR / node_dir
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dest_dir.mkdir(parents=True, exist_ok=True)
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dest = dest_dir / src.name
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if dest.exists():
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dest = dest_dir / f"{src.stem}-{int(time.time())}{src.suffix}"
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try:
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os.replace(src, dest)
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logger.error(
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"Quarantined bad event for node_dir=%s: %s -> %s (%s: %s)",
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node_dir, src, dest, type(exc).__name__, exc,
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)
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except Exception as move_exc:
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logger.error(
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"Failed to quarantine bad event for node_dir=%s: %s (%s: %s); move error=%s: %s",
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node_dir, src, type(exc).__name__, exc, type(move_exc).__name__, move_exc,
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)
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def _load_inventory(self):
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inventory = {"nodes": {}, "services": {}}
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try:
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if INVENTORY_TOPOLOGY.exists():
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with open(INVENTORY_TOPOLOGY, "r") as f:
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topo = yaml.safe_load(f)
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for node_name, node_info in topo.get("nodes", {}).items():
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inventory["nodes"][node_name] = {
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"roles": node_info.get("roles", []),
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"connectivity": node_info.get("connectivity", {})
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}
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# Load service assignments from hosts files
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hosts_dir = REPO_ROOT / "hosts"
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for host_dir in hosts_dir.iterdir():
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if host_dir.is_dir():
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svc_file = host_dir / "services.yaml"
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if svc_file.exists():
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with open(svc_file, "r") as f:
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svc_data = yaml.safe_load(f)
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host_name = svc_data.get("host")
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for svc_name, svc_info in svc_data.get("services", {}).items():
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if host_name not in inventory["services"]:
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inventory["services"][host_name] = {}
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inventory["services"][host_name][svc_name] = {
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"role": svc_info.get("role"),
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"exposure": svc_info.get("exposure")
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}
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except Exception as e:
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logger.error(f"Failed to load inventory: {e}")
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return inventory
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def _load_checkpoint(self):
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if OBSERVER_STATE_FILE.exists():
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try:
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with open(OBSERVER_STATE_FILE, "r") as f:
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checkpoint = json.load(f)
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if "node_checkpoints" in checkpoint:
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# New format: per-directory checkpoints.
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self.node_checkpoints = checkpoint["node_checkpoints"]
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elif "last_processed_file" in checkpoint:
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# Migrate old single-file checkpoint: extract node dir from path.
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old = checkpoint["last_processed_file"]
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if old:
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try:
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node_dir = Path(old).relative_to(EVENTS_DIR).parts[0]
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self.node_checkpoints = {node_dir: old}
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logger.info(f"Migrated old checkpoint → node_checkpoints: {self.node_checkpoints}")
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except Exception:
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pass # Bad path — start fresh
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self._load_world_from_disk()
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except Exception as e:
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logger.error(f"Failed to load checkpoint: {e}")
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def _load_world_from_disk(self):
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# Optional: Load existing state to resume faster
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files = {
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"nodes": WORLD_DIR / "nodes.json",
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"services": WORLD_DIR / "services.json",
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"deployments": WORLD_DIR / "deployments.json",
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"incidents": WORLD_DIR / "incidents.json",
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"summary": WORLD_DIR / "runtime-summary.json"
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}
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for key, path in files.items():
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if path.exists():
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try:
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with open(path, "r") as f:
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self.world_state[key] = json.load(f)
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except Exception as e:
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logger.error(f"Failed to load {key} state: {e}")
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def _save_checkpoint(self):
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try:
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_atomic_write_json(OBSERVER_STATE_FILE, {"node_checkpoints": self.node_checkpoints})
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except Exception as e:
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logger.error(f"Failed to save checkpoint: {e}")
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def _prune_stale_world(self):
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"""Remove world-state entries for nodes absent from the topology inventory.
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Root cause this guards against: when NODE_NAME env var is unset, node_agent.py
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falls back to socket.gethostname(), which inside a Docker container returns the
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12-char hex container ID (e.g. 'be17cb6eb0f6') instead of the canonical host name
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('vps'). The observer ingests those events and creates ghost entries that never
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expire on their own.
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Also ages out resolved incidents older than 7 days to keep world state lean.
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"""
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known_nodes = set(self.inventory["nodes"].keys())
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if not known_nodes:
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# Inventory failed to load — don't prune to avoid wiping valid state.
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return
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stale_nodes = [n for n in list(self.world_state["nodes"].keys())
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if n not in known_nodes]
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for n in stale_nodes:
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logger.info(f"Pruning stale node from world state: {n}")
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del self.world_state["nodes"][n]
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stale_svcs = [k for k in list(self.world_state["services"].keys())
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if k.split("/")[0] in stale_nodes]
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for k in stale_svcs:
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logger.info(f"Pruning stale service from world state: {k}")
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del self.world_state["services"][k]
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# Prune ghost service keys whose service-name portion is a hash-prefixed
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# Docker stale-state artifact (e.g. "9e36297651e7_control-plane-observer").
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# These are created when node-agent incorrectly uses c.name instead of the
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# compose label, and accumulate on every container rebuild.
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# Pattern: <node>/<12hexchars>_<real-name>
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ghost_svcs = [
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k for k in list(self.world_state["services"].keys())
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if len(k.split("/", 1)) == 2
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and len(k.split("/", 1)[1]) > 13
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and k.split("/", 1)[1][12] == "_"
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and all(ch in "0123456789abcdef" for ch in k.split("/", 1)[1][:12])
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]
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for k in ghost_svcs:
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logger.info(f"Pruning ghost (hash-prefixed) service key from world state: {k}")
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del self.world_state["services"][k]
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now = time.time()
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try:
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# Collect incident_ids currently referenced by any service entry.
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linked_ids: set = {
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svc.get("incident_id")
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for svc in self.world_state["services"].values()
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if svc.get("incident_id")
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}
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# Case 1 — service is healthy but still points at an active incident.
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# process_event already calls _resolve_incident on service_healthy events,
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# but if the observer restarted with on-disk state where the link was
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# intact (inconsistency from a pre-atomic-write crash), it may not get
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# resolved until the next service_healthy event is processed. Resolve
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# immediately — a healthy service cannot have an ongoing incident.
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for svc_key, svc in self.world_state["services"].items():
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if svc.get("status") != "healthy":
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continue
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inc_id = svc.get("incident_id")
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if not inc_id:
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continue
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inc = self.world_state["incidents"].get(inc_id, {})
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if inc.get("status") == "active":
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logger.info(
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f"Auto-resolving incident {inc_id} for {svc_key}: "
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f"service is healthy"
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)
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inc["status"] = "resolved"
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inc["resolved_at"] = now
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svc["incident_id"] = None
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linked_ids.discard(inc_id)
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# Case 2 — orphaned active incident: no service entry links to it and
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# last_occurrence is older than 5 minutes (guard against creation races).
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# These are the stale records left behind when on-disk state was
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# inconsistent: the service entry had incident_id cleared but incidents.json
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# still had the record as "active".
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for inc_id, inc in self.world_state["incidents"].items():
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if inc.get("status") != "active":
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continue
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if inc_id in linked_ids:
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continue
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age = now - _parse_ts(inc.get("last_occurrence"))
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if age > 300: # 5-minute guard
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logger.info(
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f"Auto-resolving orphaned incident {inc_id} "
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f"(service={inc.get('service')}, node={inc.get('node')}): "
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f"no service references it, age={int(age)}s"
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)
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inc["status"] = "resolved"
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inc["resolved_at"] = now
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except Exception as exc:
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logger.error(f"Error during incident auto-resolve in _prune_stale_world: {exc}")
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# Remove resolved incidents older than 7 days.
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# Use _parse_ts so ISO-string resolved_at values are handled correctly.
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stale_incidents = [
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k for k, v in self.world_state["incidents"].items()
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if v.get("status") == "resolved"
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and now - _parse_ts(v.get("resolved_at")) > 7 * 86400
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]
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for k in stale_incidents:
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del self.world_state["incidents"][k]
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def _save_world(self):
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self.world_state["summary"]["last_update"] = datetime.now(timezone.utc).isoformat()
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active_incidents = [
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k for k, v in self.world_state["incidents"].items() if v.get("status") == "active"
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]
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self.world_state["summary"]["active_incidents_count"] = len(active_incidents)
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self.world_state["summary"]["node_count"] = len(self.world_state["nodes"])
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self.world_state["summary"]["service_count"] = len(self.world_state["services"])
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if active_incidents:
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self.world_state["summary"]["status"] = "degraded"
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else:
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self.world_state["summary"]["status"] = "nominal"
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files = {
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"nodes.json": self.world_state["nodes"],
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"services.json": self.world_state["services"],
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"deployments.json": self.world_state["deployments"],
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"incidents.json": self.world_state["incidents"],
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"recommendations.json": [],
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"runtime-summary.json": self.world_state["summary"]
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}
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for filename, data in files.items():
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try:
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_atomic_write_json(WORLD_DIR / filename, data)
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except Exception as e:
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logger.error(f"Failed to save {filename}: {e}")
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def process_event(self, event):
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etype = event.get("type")
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node = event.get("node")
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service = event.get("service")
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severity = event.get("severity")
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timestamp = event.get("timestamp")
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cid = event.get("correlation_id")
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payload = event.get("payload", {})
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# 1. Update Node State
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if node not in self.world_state["nodes"]:
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self.world_state["nodes"][node] = {
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"status": "unknown",
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"last_seen": None,
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"roles": self.inventory["nodes"].get(node, {}).get("roles", [])
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}
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self.world_state["nodes"][node]["last_seen"] = timestamp
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if etype == "node_online":
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self.world_state["nodes"][node]["status"] = "online"
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elif etype == "node_offline":
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self.world_state["nodes"][node]["status"] = "offline"
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elif etype == "node_health":
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# Regular heartbeat from node-agent; updates resource metrics.
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# Clears disk_pressure if disk is now healthy (< warn threshold).
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self.world_state["nodes"][node]["status"] = "online"
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self.world_state["nodes"][node].update({
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"disk_usage_pct": payload.get("disk_pct"),
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"mem_usage_pct": payload.get("mem_pct"),
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"cpu_usage_pct": payload.get("cpu_pct"),
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})
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if (payload.get("disk_pct") or 0) < 75:
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self.world_state["nodes"][node].pop("disk_pressure", None)
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elif etype == "disk_pressure":
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# Emitted when disk usage crosses 75 % (medium) or 85 % (high).
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# The supervisor reads disk_pressure to generate disk_cleanup actions.
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self.world_state["nodes"][node]["disk_pressure"] = severity
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self.world_state["nodes"][node]["disk_usage_pct"] = payload.get("usage_pct")
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elif etype == "high_memory":
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# Memory pressure observation; recorded on the node for correlation.
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# No automated action — operator decides if a container restart helps.
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self.world_state["nodes"][node]["memory_pressure"] = severity
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self.world_state["nodes"][node]["mem_usage_pct"] = payload.get("usage_pct")
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elif etype == "high_cpu":
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# CPU pressure observation; recorded for visibility.
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self.world_state["nodes"][node]["cpu_pressure"] = severity
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self.world_state["nodes"][node]["cpu_usage_pct"] = payload.get("usage_pct")
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# 2. Update Service State
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if service and service != "all":
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svc_key = f"{node}/{service}"
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if svc_key not in self.world_state["services"]:
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self.world_state["services"][svc_key] = {
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"node": node,
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"service": service,
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"status": "unknown",
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"last_check": None,
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"incident_id": None
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}
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self.world_state["services"][svc_key]["last_check"] = timestamp
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if etype == "service_recovered":
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self.world_state["services"][svc_key]["status"] = "healthy"
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self._resolve_incident(svc_key, timestamp)
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elif etype == "service_healthy":
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# Positive confirmation from node-agent that a managed container
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# is running. This keeps services.json populated so the supervisor
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# can correctly detect drift (absent entry = never reported = unknown,
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# not the same as confirmed missing).
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# Also resolve any active incident — if a service that had been
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# unhealthy/crashing is now confirmed healthy, the incident is over.
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self.world_state["services"][svc_key]["status"] = "healthy"
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self._resolve_incident(svc_key, timestamp)
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elif etype in ["service_unhealthy", "healthcheck_failed"]:
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self.world_state["services"][svc_key]["status"] = "unhealthy"
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self._handle_incident(svc_key, event)
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# 3. Update Deployment State
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if etype.startswith("deployment_") and cid:
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if cid not in self.world_state["deployments"]:
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self.world_state["deployments"][cid] = {
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"node": node,
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"service": service,
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"status": "unknown",
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"started_at": None,
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"finished_at": None,
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"events": []
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}
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self.world_state["deployments"][cid]["events"].append({
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"type": etype,
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"timestamp": timestamp,
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"payload": payload
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})
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if etype == "deployment_started":
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self.world_state["deployments"][cid]["status"] = "in_progress"
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self.world_state["deployments"][cid]["started_at"] = timestamp
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elif etype == "deployment_completed":
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self.world_state["deployments"][cid]["status"] = "completed"
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self.world_state["deployments"][cid]["finished_at"] = timestamp
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elif etype == "deployment_failed":
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self.world_state["deployments"][cid]["status"] = "failed"
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self.world_state["deployments"][cid]["finished_at"] = timestamp
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# Deployment failure often creates an incident
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self._handle_deployment_failure(event)
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def _handle_incident(self, svc_key, event):
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# Correlation: collapse repeated failures for the same service on the same node
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active_incident = self.world_state["services"][svc_key].get("incident_id")
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if active_incident and active_incident in self.world_state["incidents"]:
|
|
incident = self.world_state["incidents"][active_incident]
|
|
if incident["status"] == "active":
|
|
incident["last_occurrence"] = event["timestamp"]
|
|
incident["occurrence_count"] = incident.get("occurrence_count", 1) + 1
|
|
incident["events"].append(event["timestamp"])
|
|
return
|
|
|
|
# Create new incident
|
|
incident_id = f"inc-{int(time.time())}-{event.get('node')}-{event.get('service')}"
|
|
self.world_state["incidents"][incident_id] = {
|
|
"id": incident_id,
|
|
"node": event.get("node"),
|
|
"service": event.get("service"),
|
|
"status": "active",
|
|
"severity": event.get("severity"),
|
|
# trigger_type records the event type that opened this incident so that
|
|
# the supervisor can choose the appropriate remediation action
|
|
# (e.g. container_restart for containers_not_running / mqtt_unreachable
|
|
# vs. a full redeploy for other causes).
|
|
"trigger_type": event.get("type"),
|
|
"started_at": event.get("timestamp"),
|
|
"last_occurrence": event.get("timestamp"),
|
|
"occurrence_count": 1,
|
|
"events": [event["timestamp"]],
|
|
"correlation_id": event.get("correlation_id")
|
|
}
|
|
self.world_state["services"][svc_key]["incident_id"] = incident_id
|
|
|
|
def _resolve_incident(self, svc_key, timestamp):
|
|
incident_id = self.world_state["services"][svc_key].get("incident_id")
|
|
if incident_id and incident_id in self.world_state["incidents"]:
|
|
if self.world_state["incidents"][incident_id]["status"] == "active":
|
|
self.world_state["incidents"][incident_id]["status"] = "resolved"
|
|
self.world_state["incidents"][incident_id]["resolved_at"] = timestamp
|
|
self.world_state["services"][svc_key]["incident_id"] = None
|
|
|
|
def _handle_deployment_failure(self, event):
|
|
# Specific logic for deployment failures
|
|
svc_key = f"{event.get('node')}/{event.get('service')}"
|
|
self._handle_incident(svc_key, event)
|
|
|
|
# Link diagnostics if available in payload
|
|
incident_id = self.world_state["services"][svc_key].get("incident_id")
|
|
if incident_id and incident_id in self.world_state["incidents"]:
|
|
payload = event.get("payload", {})
|
|
if "diagnostics_file" in payload:
|
|
self.world_state["incidents"][incident_id]["diagnostics_ref"] = payload["diagnostics_file"]
|
|
elif "error" in payload:
|
|
self.world_state["incidents"][incident_id]["last_error"] = payload["error"]
|
|
|
|
def run_once(self):
|
|
# Update heartbeat
|
|
heartbeat_file = STATE_DIR / "observer.heartbeat"
|
|
try:
|
|
heartbeat_file.touch()
|
|
except Exception as e:
|
|
logger.error(f"Failed to touch heartbeat file: {e}")
|
|
|
|
# Collect all event files grouped by node directory.
|
|
# Per-node checkpoints are compared within each directory independently,
|
|
# so late-arriving events from remote nodes (sorted earlier in the path)
|
|
# are never skipped just because another node's checkpoint is further ahead.
|
|
all_files = sorted(glob.glob(str(EVENTS_DIR / "**" / "*.json"), recursive=True))
|
|
|
|
new_files = []
|
|
for file_path in all_files:
|
|
try:
|
|
node_dir = str(Path(file_path).relative_to(EVENTS_DIR).parts[0])
|
|
except (IndexError, ValueError):
|
|
node_dir = "__unknown__"
|
|
last_for_node = self.node_checkpoints.get(node_dir, "")
|
|
if file_path > last_for_node:
|
|
new_files.append((node_dir, file_path))
|
|
|
|
if not new_files:
|
|
# Even if no new events, prune stale entries and refresh summary freshness.
|
|
self._prune_stale_world()
|
|
self._save_world()
|
|
return
|
|
|
|
logger.info(f"Processing {len(new_files)} new events across "
|
|
f"{len({n for n, _ in new_files})} node(s)")
|
|
for node_dir, file_path in new_files:
|
|
try:
|
|
with open(file_path, "r") as f:
|
|
event = json.load(f)
|
|
self.process_event(event)
|
|
# Advance per-node checkpoint (only forward — no regression).
|
|
if file_path > self.node_checkpoints.get(node_dir, ""):
|
|
self.node_checkpoints[node_dir] = file_path
|
|
except Exception as e:
|
|
logger.error(
|
|
"Error processing node_dir=%s file=%s (%s: %s)",
|
|
node_dir, file_path, type(e).__name__, e,
|
|
)
|
|
self._quarantine_event_file(file_path, node_dir, e)
|
|
|
|
self._save_checkpoint()
|
|
self._prune_stale_world()
|
|
self._save_world()
|
|
|
|
def loop(self, interval=5):
|
|
logger.info("Starting observer loop")
|
|
while True:
|
|
self.run_once()
|
|
time.sleep(interval)
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
observer = Observer()
|
|
if "--run-once" in sys.argv:
|
|
observer.run_once()
|
|
else:
|
|
observer.loop()
|