GodopuandClaude Fable 5.1
0550320590
Review round 1 (claude NOT PASS) corrections: - B2: the timer now watches a process - `--watch-pid`, or by default the nearest agent-CLI ancestor of the publishing command - and stops within one period once it is gone, so a crashed agent stops heartbeating and is closed after K x N; a remote runner watches itself. Documented as process liveness (an alive-but-stuck agent keeps heartbeating). - R1: `_wait_started` accepts an events.log `started` only when it carries the current dispatch token (loop jobs share one events.log). - R2: the remote runner ignores a re-sent dispatch of an attempt that already reached its terminal. - R3: registry.md EOF blank line (git diff --check clean). - R4: the ack error states the effective budget when the wall clock cut it. - P3: stop_timer verifies the pidfile pid is this job's timer before signalling; a retained state message keeps its own seq watermark so it can never make the monotonic guard drop its own event. - MULTI_AGENT_RULES.md timeout section updated for the contract. - tests: agent-process death stops the timer, recycled-pid safety, attempt-scoped started, re-sent dispatch; acceptance 3 now kills the agent process instead of the timer. Help captures refreshed (--watch-pid). The wrapper can be sourced with MAM_DELEGATE_JOB_NO_MAIN=1 for helper-level tests. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff
563 lines
26 KiB
Python
Executable File
563 lines
26 KiB
Python
Executable File
#!/usr/bin/env python3
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"""job_subscriber.py — the single entry point for observing Job events.
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Subscribes to one job's ``<topic_prefix>/events`` (or, with ``--wait-any``, the
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events of every running/pending job in the registry), prints one line to stdout
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per accepted event, and exits on a terminal event or a timeout.
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Design points (all flagged in the PLAN review):
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- terminal state machine: ``completed``/``error`` is acted on exactly once per
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job, so QoS-1 duplicates or an ``error``-after-``completed`` reorder are safe.
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- dual timeouts: a wall-clock ``--timeout`` (total budget, started at
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subscribe time so a cold start can't hang forever) AND an idle
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``--idle-timeout`` (no new event for N seconds).
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- defensive parsing: undecodable payloads, ``schema_version`` mismatches, and
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``job_id`` values we did not subscribe for are logged and dropped.
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stdout = event lines only. Diagnostics go to stderr via logging.
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Exit codes:
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0 all watched jobs reached ``completed``
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1 any watched job reached ``error``
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2 timed out (wall-clock or idle) before all jobs finished
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"""
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from __future__ import annotations
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import argparse
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import json
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import logging
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import queue
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import sys
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import time
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from typing import Any, Dict, List, Optional, Set, Tuple
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from lib_py.delegation import mqtt_common
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from lib_py.delegation import registry
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from lib_py.delegation.mqtt_common import (
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SCHEMA_VERSION,
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broker_config_from_job,
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default_registry_dir,
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load_job,
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make_client,
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)
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logger = logging.getLogger("delegate_job.job_subscriber")
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TERMINAL_EVENTS = ("completed", "error")
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TERMINAL_STATUSES = ("completed", "error", "cancelled")
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STATE_EVENT = "state"
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def _format_line(topic: str, payload: Dict[str, Any]) -> str:
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source_tag = f" [{payload['source']}]" if payload.get("source") else ""
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return (
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f"{payload.get('timestamp','-')} "
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f"job={payload.get('job_id','?')} "
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f"seq={payload.get('seq','?')} "
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f"{payload.get('event','?') + source_tag:<20} "
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f"{payload.get('detail','')}"
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)
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def _check_disk_fallback(
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pending: Set[str],
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registry_dir: str,
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terminal: Dict[str, str],
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expected_dispatch_tokens: Optional[Dict[str, Optional[str]]] = None,
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expected_attempts: Optional[Dict[str, Optional[int]]] = None,
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) -> None:
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"""Check local on-disk registry and audit logs for terminal status (B-15)."""
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for jid in list(pending):
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disk_status = None
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rec_token = None
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rec_attempt = None
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try:
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job_rec = load_job(jid, registry_dir)
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disk_status = job_rec.get("status")
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rec_token = job_rec.get("dispatch_token")
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rec_attempt = job_rec.get("attempt_id", job_rec.get("iteration"))
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except Exception:
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job_rec = {}
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if not disk_status or disk_status not in ("completed", "error", "cancelled"):
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try:
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disk_status = mqtt_common.read_logged_status(jid, mqtt_common.get_logs_dir())
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except Exception:
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pass
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if disk_status in ("completed", "error", "cancelled"):
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if expected_dispatch_tokens:
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exp_token = expected_dispatch_tokens.get(jid)
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if exp_token is not None and rec_token != exp_token:
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logger.warning("disk fallback ignored terminal status for %s due to dispatch_token mismatch (%r != %r)",
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jid, rec_token, exp_token)
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continue
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if expected_attempts:
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exp_att = expected_attempts.get(jid)
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if exp_att is not None and rec_attempt is not None and rec_attempt < exp_att:
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logger.warning("disk fallback ignored terminal status for %s due to attempt_id older than expected (%r < %r)",
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jid, rec_attempt, exp_att)
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continue
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synth_event = "completed" if disk_status == "completed" else "error"
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synth_payload = {
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"job_id": jid,
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"event": synth_event,
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"seq": -1,
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"timestamp": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime()),
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"detail": f"terminal status '{disk_status}' resolved via disk-fallback",
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"source": "disk-fallback",
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}
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synth_topic = f"mam/{jid}/events"
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print(_format_line(synth_topic, synth_payload), flush=True)
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terminal[jid] = synth_event
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pending.discard(jid)
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class _Watcher:
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"""Holds the shared queue + the set of job_ids we accept events for."""
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def __init__(self, expected_job_ids: Set[str], expected_tokens: Dict[str, Optional[str]], expected_seqs: Dict[str, int],
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expected_dispatch_tokens: Optional[Dict[str, Optional[str]]] = None,
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expected_attempts: Optional[Dict[str, Optional[int]]] = None):
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self.events: "queue.Queue[Tuple[str, Dict[str, Any]]]" = queue.Queue()
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self.expected = set(expected_job_ids)
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self.tokens = expected_tokens # job_id -> expected auth_token (or None)
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self.last_seq = dict(expected_seqs)
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self.dispatch_tokens = dict(expected_dispatch_tokens or {})
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self.attempts = dict(expected_attempts or {})
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# Intent identities already accepted, per job. A replayed notification is
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# re-published with a *fresh* wire sequence, so the monotonic sequence
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# guard below cannot recognise it: to that guard a retry looks like a new
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# event. The intent identity is what stays stable across a retry, so
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# deduplication has to happen on that.
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#
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# This is per-process state. Across a restart the disk fallback resolves
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# terminal status from the registry, and a duplicate terminal is refused
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# by the transition boundary as an idempotent ack, so a replay after
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# restart cannot double-apply either.
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self.seen_intents = {}
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# Issue #18: jobs for which at least one wire event was accepted. A seq
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# gap is only meaningful after that - the initial last_seq comes from
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# the registry and may be behind the wire (or ahead of a fresh remote).
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self.accepted_any: Set[str] = set()
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self.state_seq: Dict[str, int] = {}
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def _note_seq_gap(self, jid: str, expected: int, got: int, via: str, topic: str) -> None:
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"""Issue #18: a seq the subscriber never saw is a detected loss."""
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logger.warning("seq gap for job %s: expected %d, got %d (via %s)", jid, expected, got, via)
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mqtt_common.append_event(jid, {
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"event": "seq_gap",
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"expected_seq": expected,
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"seq": got,
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"via": via,
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"topic": topic,
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})
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def _on_state(self, msg, payload: Dict[str, Any], jid: str) -> None:
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"""A retained `<prefix>/state` message (Issue #18): learn the job's
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status and last seq at (re)connect without waiting for the next
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heartbeat. Signed and token-checked like an event. Delivered to the
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main loop as a state item so the idle window resets and a terminal
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status ends the wait."""
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seq = payload.get("seq")
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if not isinstance(seq, int):
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logger.warning("drop state for job %s: missing or invalid seq", jid)
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return
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# A state message never advances the event watermark: MQTT orders
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# messages per connection, not across topics, so a state that overtakes
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# its own event must not make the monotonic guard drop that event.
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last = max(self.last_seq.get(jid, 0), self.state_seq.get(jid, 0))
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if jid in self.accepted_any and seq > last + 1:
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self._note_seq_gap(jid, last + 1, seq, "state", msg.topic)
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if seq > self.state_seq.get(jid, 0):
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self.state_seq[jid] = seq
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mqtt_common.append_event(jid, {
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"event": "received",
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"source_event": STATE_EVENT,
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"seq": seq,
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"topic": msg.topic,
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"timestamp": payload.get("timestamp"),
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"detail": "status={} last_event={}".format(payload.get("status"), payload.get("last_event")),
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})
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self.events.put((msg.topic, payload))
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def on_message(self, _client, _userdata, msg) -> None:
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# --- defensive parsing -------------------------------------------
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try:
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payload = json.loads(msg.payload.decode("utf-8"))
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except (UnicodeDecodeError, json.JSONDecodeError) as exc:
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logger.warning("drop unparseable payload on %s: %s", msg.topic, exc)
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return
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if not isinstance(payload, dict):
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logger.warning("drop non-object payload on %s", msg.topic)
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return
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if payload.get("schema_version") != SCHEMA_VERSION:
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logger.warning("drop event with schema_version=%r (expected %d)",
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payload.get("schema_version"), SCHEMA_VERSION)
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return
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jid = payload.get("job_id")
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if jid not in self.expected:
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logger.warning("drop event for unexpected job_id=%r on %s", jid, msg.topic)
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return
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# --- production auth check: data.auth_token must match if expected ---
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expected_token = self.tokens.get(jid)
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if not mqtt_common.verify_hmac(payload, expected_token):
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logger.warning("drop event for job %s: HMAC verify failed", jid)
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return
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# --- CAS dispatch token & attempt check: drop stale attempt events ---
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expected_disp_tok = self.dispatch_tokens.get(jid)
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if expected_disp_tok is not None:
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data = payload.get("data")
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ev_tok = data.get("dispatch_token") if isinstance(data, dict) else None
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if ev_tok != expected_disp_tok:
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logger.warning("drop event for job %s: dispatch_token %r does not match expected %r",
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jid, ev_tok, expected_disp_tok)
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return
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expected_att = self.attempts.get(jid)
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if expected_att is not None:
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data = payload.get("data")
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ev_att = data.get("attempt_id") if isinstance(data, dict) else None
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if ev_att is not None and isinstance(ev_att, int) and ev_att < expected_att:
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logger.warning("drop event for job %s: attempt_id %r is older than expected %r",
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jid, ev_att, expected_att)
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return
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if payload.get("event") == STATE_EVENT:
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self._on_state(msg, payload, jid)
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return
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# --- replay attack defense: check monotonic sequence ---
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seq = payload.get("seq")
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if seq is None or not isinstance(seq, int):
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logger.warning("drop event for job %s: missing or invalid seq", jid)
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return
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data = payload.get("data")
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intent = data.get("notification_intent") if isinstance(data, dict) else None
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identity = None
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if intent is not None:
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# Present but not an object: it cannot yield a stable identity, so the
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# replay guard below could not protect it. Refuse rather than admit a
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# notification we would be unable to recognise on its retry.
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if not isinstance(intent, dict):
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logger.warning("drop event for job %s: notification_intent is %s, not an object",
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jid, type(intent).__name__)
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return
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identity = (intent.get("seq"), intent.get("event"), intent.get("timestamp"))
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try:
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already_seen = identity in self.seen_intents.setdefault(jid, set())
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except TypeError:
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# A malformed sender can put an unhashable value in a field. That
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# must not escape defensive parsing as an exception: a callback
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# raising here would take down the network loop for every job.
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logger.warning("drop event for job %s: notification intent %r has no stable identity",
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jid, intent)
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return
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if already_seen:
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logger.info("drop event for job %s: notification intent %s already accepted",
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jid, identity)
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return
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if seq <= self.last_seq.get(jid, 0):
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logger.warning("drop event for job %s: seq %d is not monotonically increasing (last %d)",
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jid, seq, self.last_seq.get(jid, 0))
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return
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if jid in self.accepted_any and seq > self.last_seq.get(jid, 0) + 1:
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self._note_seq_gap(jid, self.last_seq.get(jid, 0) + 1, seq, "events", msg.topic)
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self.last_seq[jid] = seq
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self.accepted_any.add(jid)
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# Recorded only once the event is actually accepted. A late packet that the
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# sequence guard refuses must not mark its intent as seen, or the genuine
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# retry that follows would be mistaken for the replay of an event this
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# subscriber never delivered.
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if identity is not None:
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self.seen_intents[jid].add(identity)
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# Persistent audit log from the *subscriber's* vantage point: every event
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# that survives defensive parsing is recorded here, including ones a
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# different host published. This is the external-observer record that
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# backstops the publisher's own "published" line if it never wrote one.
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mqtt_common.append_event(jid, {
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"event": "received",
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"source_event": payload.get("event"),
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"seq": payload.get("seq"),
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"topic": msg.topic,
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"timestamp": payload.get("timestamp"),
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"detail": payload.get("detail", ""),
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})
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self.events.put((msg.topic, payload))
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def _sync_remote_status(jid: str, status: str, registry_dir: str,
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dispatch_token: Optional[str]) -> None:
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"""Issue #18: mirror a wire event into the orchestrator's registry for a
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job whose agent shares no disk with it. Goes through the same transition
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boundary as the publisher's own status sync; a refused (late/duplicate)
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transition is logged, never raised."""
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try:
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res = mqtt_common.transition_job_status(
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jid, registry_dir, _source="job_subscriber", status=status,
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expected_dispatch_token=dispatch_token)
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if not res.committed and not res.idempotent:
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logger.warning("remote status sync refused for %s -> %s: %s", jid, status, res.reason)
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except Exception as exc: # pragma: no cover - best effort
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logger.warning("remote status sync failed for %s: %s", jid, exc)
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def _collect_jobs(args) -> List[Dict[str, Any]]:
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"""Resolve the list of job records this invocation should watch."""
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if args.wait_any:
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jobs = [r for r in registry.list_jobs(args.registry_dir)
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if r.get("status") in ("pending", "running")]
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if not jobs:
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logger.error("no pending/running jobs to wait for")
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return jobs
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job = load_job(args.job, args.registry_dir) # raises FileNotFoundError
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return [job]
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def _run_subscriber(args) -> int:
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try:
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jobs = _collect_jobs(args)
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except FileNotFoundError as exc:
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logger.error("%s", exc)
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return 2
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if not jobs:
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return 2
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expected_ids: Set[str] = {j["job_id"] for j in jobs}
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tokens = {j["job_id"]: j.get("auth_token") for j in jobs}
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seqs = {}
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dispatch_tokens = {}
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attempts = {}
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for j in jobs:
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jid = j["job_id"]
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last_seq = int(j.get("last_seq", 0))
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seqs[jid] = max(0, last_seq - 1)
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dispatch_tokens[jid] = j.get("dispatch_token")
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attempts[jid] = j.get("attempt_id", j.get("iteration", 1))
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if args.expect_dispatch_token is not None and args.job:
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dispatch_tokens[args.job] = args.expect_dispatch_token
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if args.attempt_id is not None and args.job:
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attempts[args.job] = args.attempt_id
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watcher = _Watcher(expected_ids, tokens, seqs, dispatch_tokens, attempts)
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# Resolve timeouts from CLI, falling back to the (first) job's settings.
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base_job = jobs[0]
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wall_timeout = args.timeout if args.timeout is not None else float(base_job.get("timeout_sec", 3600))
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idle_timeout = args.idle_timeout if args.idle_timeout is not None else float(base_job.get("idle_timeout_sec", 120))
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# Issue #18: until the first accepted event the "last event" is the
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# injection itself, which happens after this subscriber started and may
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# take up to the ack timeout T to produce `started` (a remote runner has
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# to receive the dispatch first). The idle budget before the first event
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# is therefore T + K x N; from the first event on it is K x N.
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ack_timeout = args.ack_timeout if args.ack_timeout is not None else float(base_job.get("ack_timeout_sec", 0) or 0)
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first_event_seen = False
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# All watched jobs share a broker in practice; connect using the first
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# job's broker and subscribe to each job's events topic.
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config = broker_config_from_job(base_job)
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client = make_client("subscriber", config)
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client.on_message = watcher.on_message
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# Issue #18: a remote job (no shared disk with the agent) has nobody else
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# to move its registry record - the subscriber does it from the wire.
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remote_sync = bool(args.remote) or any(j.get("transport") == "remote" for j in jobs)
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subscribed_topics = []
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state_topics = []
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for job in jobs:
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prefix = job.get("topic_prefix") or mqtt_common.topic_prefix_for(job["job_id"])
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subscribed_topics.append(f"{prefix}/events")
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state_topics.append(f"{prefix}/state")
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connects = {"count": 0}
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def on_connect(_c, _u, _flags, reason_code, _props):
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if mqtt_common.reason_code_value(reason_code) != 0:
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logger.error("broker connection failed: rc=%s", reason_code)
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return
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connects["count"] += 1
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if connects["count"] > 1:
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# Issue #18: paho reconnected on its own; re-subscribing here is
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# what makes the retained state message arrive again at once.
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logger.warning("broker reconnected (connect #%d); re-subscribing", connects["count"])
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for jid in expected_ids:
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mqtt_common.append_event(jid, {"event": "reconnected", "connect_count": connects["count"]})
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for topic in subscribed_topics + state_topics:
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_c.subscribe(topic, qos=1)
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logger.info("subscribed to %s", topic)
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def on_disconnect(_c, _u, _flags, reason_code, _props):
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rc = mqtt_common.reason_code_value(reason_code)
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if rc != 0:
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logger.warning("broker disconnected (rc=%s); will retry reconnect", reason_code)
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start = time.monotonic()
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wall_deadline = start + wall_timeout
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last_event = start
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last_disk_check = 0.0
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retention_checked = not args.expect_retention
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connected = False
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subscribed = False
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def on_subscribe(_c, _u, mid, granted_qos, _props=None):
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nonlocal last_event, subscribed
|
|
subscribed = True
|
|
last_event = time.monotonic()
|
|
for topic in subscribed_topics:
|
|
print(f"SUBSCRIBED {topic}", flush=True)
|
|
|
|
client.on_connect = on_connect
|
|
client.on_disconnect = on_disconnect
|
|
client.on_subscribe = on_subscribe
|
|
client.reconnect_delay_set(min_delay=1, max_delay=16)
|
|
|
|
terminal: Dict[str, str] = {} # job_id -> "completed"/"error"
|
|
pending: Set[str] = set(expected_ids)
|
|
|
|
# Check if all jobs are already in terminal state on disk before connecting
|
|
_check_disk_fallback(pending, args.registry_dir, terminal, dispatch_tokens, attempts)
|
|
if not pending:
|
|
if any(state == "error" for state in terminal.values()):
|
|
return 1
|
|
return 0
|
|
|
|
try:
|
|
mqtt_common.with_retry(
|
|
lambda: client.connect(config.host, config.port, config.keepalive),
|
|
attempts=3, base_delay=0.2, max_delay=1.0
|
|
)()
|
|
client.loop_start()
|
|
connected = True
|
|
last_event = time.monotonic()
|
|
except Exception as exc:
|
|
logger.warning("broker connection failed (%s); checking disk fallback", exc)
|
|
_check_disk_fallback(pending, args.registry_dir, terminal, dispatch_tokens, attempts)
|
|
if not pending:
|
|
if any(state == "error" for state in terminal.values()):
|
|
return 1
|
|
return 0
|
|
logger.error("broker connection failed: %s", exc)
|
|
return 3
|
|
|
|
try:
|
|
while pending:
|
|
now = time.monotonic()
|
|
if now >= wall_deadline:
|
|
_check_disk_fallback(pending, args.registry_dir, terminal, dispatch_tokens, attempts)
|
|
if not pending:
|
|
break
|
|
logger.error("wall-clock timeout (%.0fs); still pending: %s",
|
|
wall_timeout, ", ".join(sorted(pending)))
|
|
return 2
|
|
if not subscribed:
|
|
last_event = now
|
|
idle_left = (idle_timeout if first_event_seen else idle_timeout + ack_timeout) - (now - last_event)
|
|
if idle_left <= 0:
|
|
_check_disk_fallback(pending, args.registry_dir, terminal, dispatch_tokens, attempts)
|
|
if not pending:
|
|
break
|
|
logger.error("idle timeout (%.0fs, no events); still pending: %s",
|
|
idle_timeout, ", ".join(sorted(pending)))
|
|
return 2
|
|
wait = min(wall_deadline - now, idle_left, 1.0)
|
|
try:
|
|
topic, payload = watcher.events.get(timeout=wait)
|
|
except queue.Empty:
|
|
if not retention_checked and (now - start) > 3.0:
|
|
logger.warning("--expect-retention set but no retained "
|
|
"terminal event observed yet")
|
|
retention_checked = True
|
|
|
|
# Step 2 (B-15): Local disk fallback throttled to every 3.0s
|
|
if (now - last_disk_check) >= 3.0:
|
|
last_disk_check = now
|
|
_check_disk_fallback(pending, args.registry_dir, terminal, dispatch_tokens, attempts)
|
|
continue
|
|
|
|
last_event = time.monotonic()
|
|
retention_checked = True
|
|
first_event_seen = True
|
|
|
|
jid = payload["job_id"]
|
|
event = payload.get("event")
|
|
if event == STATE_EVENT:
|
|
# Issue #18: retained job state. Any state resets the idle
|
|
# window (the agent is alive enough to have published); a
|
|
# terminal status ends the wait exactly like the terminal event.
|
|
status = payload.get("status")
|
|
if status in TERMINAL_STATUSES and jid not in terminal:
|
|
synth = "completed" if status == "completed" else "error"
|
|
payload = dict(payload, event=synth, source="state",
|
|
detail="terminal status '{}' recovered from retained state".format(status))
|
|
print(_format_line(topic, payload), flush=True)
|
|
terminal[jid] = synth
|
|
pending.discard(jid)
|
|
if remote_sync:
|
|
_sync_remote_status(jid, status, args.registry_dir, dispatch_tokens.get(jid))
|
|
continue
|
|
|
|
print(_format_line(topic, payload), flush=True)
|
|
if remote_sync and event in ("started", "completed", "error", "cancelled"):
|
|
_sync_remote_status(jid, {"started": "running"}.get(event, event),
|
|
args.registry_dir, dispatch_tokens.get(jid))
|
|
if event in TERMINAL_EVENTS:
|
|
if jid in terminal:
|
|
# Already finalised: ignore duplicates / late reorders.
|
|
logger.info("ignoring duplicate terminal %s for %s", event, jid)
|
|
continue
|
|
terminal[jid] = event
|
|
pending.discard(jid)
|
|
finally:
|
|
if connected:
|
|
client.loop_stop()
|
|
try:
|
|
client.disconnect()
|
|
except Exception: # pragma: no cover
|
|
pass
|
|
|
|
# All jobs reached a terminal state. error wins over completed.
|
|
if any(state == "error" for state in terminal.values()):
|
|
return 1
|
|
return 0
|
|
|
|
|
|
def main(argv=None) -> int:
|
|
parser = argparse.ArgumentParser(description="Subscribe to Job events on MQTT")
|
|
target = parser.add_mutually_exclusive_group(required=True)
|
|
target.add_argument("--job", help="job id to watch")
|
|
target.add_argument("--wait-any", action="store_true",
|
|
help="watch every pending/running job in the registry")
|
|
parser.add_argument("--timeout", type=float, default=None,
|
|
help="wall-clock budget in seconds (default: job.timeout_sec or 3600)")
|
|
parser.add_argument("--idle-timeout", type=float, default=None,
|
|
help="max seconds with no new event (default: job.idle_timeout_sec or 120)")
|
|
parser.add_argument("--ack-timeout", type=float, default=None,
|
|
help="extra idle budget before the first event, for the injection to "
|
|
"produce `started` (default: job.ack_timeout_sec; Issue #18)")
|
|
parser.add_argument("--expect-retention", action="store_true",
|
|
help="warn if no retained terminal event arrives promptly")
|
|
parser.add_argument("--expect-dispatch-token", default=None,
|
|
help="expected dispatch token for CAS verification")
|
|
parser.add_argument("--attempt-id", type=int, default=None,
|
|
help="minimum attempt id to accept events for")
|
|
parser.add_argument("--registry-dir", default=default_registry_dir())
|
|
parser.add_argument("--remote", action="store_true",
|
|
help="the agent shares no disk with this registry: mirror started/"
|
|
"terminal events into the job record (Issue #18; automatic "
|
|
"for jobs registered with --transport remote)")
|
|
parser.add_argument("-v", "--verbose", action="store_true")
|
|
args = parser.parse_args(argv)
|
|
|
|
mqtt_common.ensure_env_loaded()
|
|
mqtt_common.setup_logging(logging.DEBUG if args.verbose else logging.WARNING)
|
|
|
|
try:
|
|
return _run_subscriber(args)
|
|
except Exception as exc:
|
|
logger.error("subscriber fatal error: %s", exc)
|
|
return 3
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|