622 lines
25 KiB
Python
622 lines
25 KiB
Python
"""Fixed Root maintenance orchestration; owners drain work, never forged terminal state."""
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import argparse
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import fcntl
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import json
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import os
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import re
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import secrets
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import stat
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import subprocess
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import time
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from pathlib import Path
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from uuid import UUID
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from . import (
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availability,
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configuration,
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dependency_install,
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factory_service,
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install,
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node_health,
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operator_units,
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preflight,
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proxy_install,
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proxy_service,
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service_install,
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services,
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)
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from .policy import DeliveryError, canonical, digest, fields, read_json, sha256
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STATE = Path("/var/lib/kf-onlinejudge/operations")
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LAST = STATE / "maintenance.last.json"
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APPS = ("proxy", "api", "outbox", "worker", "problem-import", "coordinator", "sandbox-factory")
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DEPENDENCIES = ("postgres", "rabbitmq")
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START_ORDER = (
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"sandbox-factory",
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"coordinator",
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"api",
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"outbox",
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"problem-import",
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"worker",
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"proxy",
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)
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DRAIN_SECONDS = 360
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def validate_record(value: dict) -> dict:
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required = {
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"schema_version",
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"source_sha",
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"configuration_id",
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"action",
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"phase",
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"success",
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"events",
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"root_cleanup_confirmed",
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"boot_id",
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}
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if (
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not isinstance(value, dict)
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or not required <= set(value)
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or not set(value) - required <= {"drain_projection", "failure_code"}
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):
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raise DeliveryError("unknown maintenance receipt fields")
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if (
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type(value["schema_version"]) is not int
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or value["schema_version"] != 1
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or not isinstance(value["source_sha"], str)
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or not re.fullmatch(r"[0-9a-f]{40}", value["source_sha"])
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or not isinstance(value["configuration_id"], str)
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or not re.fullmatch(r"cfg-[0-9a-f]{24}", value["configuration_id"])
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or not isinstance(value["action"], str)
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or value["action"] not in {"start", "resume", "drain", "stop", "restart"}
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or not isinstance(value["phase"], str)
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or value["phase"]
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not in {
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"prepared",
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"dispatching_start",
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"dispatching_stop",
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"start_confirmed",
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"stop_confirmed",
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"admission_closed",
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"root_stop_proven",
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"quiescent",
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"accepting",
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"complete",
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"failed",
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}
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or type(value["success"]) is not bool
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or type(value["root_cleanup_confirmed"]) is not bool
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or not isinstance(value["events"], list)
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or len(value["events"]) > 32
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or "failure_code" in value
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and value["failure_code"] != "maintenance_unconfirmed"
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):
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raise DeliveryError("unknown maintenance receipt binding")
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if not isinstance(value["boot_id"], str):
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raise DeliveryError("maintenance boot identity differs")
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identifier = UUID(value["boot_id"])
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if identifier.int == 0 or str(identifier) != value["boot_id"]:
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raise DeliveryError("maintenance boot identity differs")
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for event in value["events"]:
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fields(event, {"unit", "operation", "confirmed"}, "maintenance event")
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if (
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not isinstance(event["unit"], str)
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or event["unit"] not in {*APPS, *DEPENDENCIES}
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or not isinstance(event["operation"], str)
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or event["operation"] not in {"start", "stop"}
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or type(event["confirmed"]) is not bool
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):
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raise DeliveryError("unknown maintenance event authority")
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if "drain_projection" in value and not projection_empty(value["drain_projection"]):
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raise DeliveryError("maintenance quiescence proof differs")
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return value
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def projection_empty(snapshot: dict) -> bool:
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fields(
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snapshot,
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{"execution", "outbox", "imports", "broker", "factory"},
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"drain projection",
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)
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execution = fields(
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snapshot["execution"],
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{"queued", "in_flight", "cleanup_unconfirmed", "database_clock_unix_ms"},
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"execution drain projection",
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)
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if (
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type(execution["database_clock_unix_ms"]) is not int
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or execution["database_clock_unix_ms"] <= 0
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):
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raise DeliveryError("execution drain clock unavailable")
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for name in ("queued", "in_flight", "cleanup_unconfirmed"):
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item = fields(execution[name], {"count_capped", "truncated"}, "execution drain counter")
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if (
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type(item["count_capped"]) is not int
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or not 0 <= item["count_capped"] <= 128
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or type(item["truncated"]) is not bool
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):
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raise DeliveryError("execution drain counter unavailable")
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if execution[name] != {"count_capped": 0, "truncated": False}:
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return False
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node_health.validate_outbox(snapshot["outbox"])
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outbox = snapshot["outbox"]
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imports = snapshot["imports"]
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fields(
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imports,
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{
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"schema_version",
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"worker_ready",
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"reserved_bytes",
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"uploaded_capped",
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"validating_capped",
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"truncated",
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},
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"import drain projection",
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)
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if (
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type(imports["schema_version"]) is not int
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or imports["schema_version"] != 1
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or type(imports["worker_ready"]) is not bool
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or type(imports["truncated"]) is not bool
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or any(
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type(imports[k]) is not int or not 0 <= imports[k] <= maximum
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for k, maximum in (
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("reserved_bytes", 268435456),
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("uploaded_capped", 128),
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("validating_capped", 128),
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)
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)
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):
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raise DeliveryError("import drain counters unavailable")
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broker, root = snapshot["broker"], snapshot["factory"]
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if not isinstance(root, dict):
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raise DeliveryError("factory drain proof unavailable")
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node_health.validate_factory(root, sha256(root.get("configuration_sha256")))
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fields(
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broker,
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{
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"schema_version",
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"metadata_verified",
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"messages_ready",
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"messages_unacknowledged",
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"message_bytes",
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"consumers",
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},
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"broker drain projection",
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)
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if (
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type(broker["schema_version"]) is not int
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or broker["schema_version"] != 1
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or broker["metadata_verified"] is not True
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or any(
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type(broker[k]) is not int or not 0 <= broker[k] <= maximum
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for k, maximum in (
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("messages_ready", 64),
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("messages_unacknowledged", 1),
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("message_bytes", 32768 + 4096),
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("consumers", 1),
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)
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)
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):
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raise DeliveryError("broker drain projection unavailable")
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if (
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type(root["active_helpers"]) is not int
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or not 0 <= root["active_helpers"] <= 1
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or type(root["cleanup_complete"]) is not bool
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):
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raise DeliveryError("factory drain proof unavailable")
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return bool(
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not outbox["truncated"]
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and outbox["pending_capped"] == outbox["locked_capped"] == 0
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and imports["truncated"] is False
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and imports["uploaded_capped"] == imports["validating_capped"] == 0
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and broker["messages_ready"] == broker["messages_unacknowledged"] == 0
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and root["active_helpers"] == 0
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and root["cleanup_complete"] is True
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)
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class Maintenance:
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def __init__(self, selected: dict, paths: dict, payload: Path, action: str):
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self.selected, self.paths, self.payload = selected, paths, payload
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self.coordinator = read_json(paths["coordinator.json"], 32768)
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self.record = {
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"schema_version": 1,
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"source_sha": read_json(payload.parent / "manifest.json")["source_sha"],
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"configuration_id": selected["configuration_id"],
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"action": action,
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"phase": "prepared",
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"success": False,
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"events": [],
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"root_cleanup_confirmed": False,
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"boot_id": Path("/proc/sys/kernel/random/boot_id").read_text().strip(),
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}
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def save(self, phase: str) -> None:
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self.record["phase"] = phase
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if len(self.record["events"]) > 32:
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raise DeliveryError("maintenance event bound")
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contents = canonical(validate_record(self.record))
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if len(contents) > 32768:
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raise DeliveryError("maintenance receipt bound")
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if LAST.exists() or LAST.is_symlink():
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preflight.protected(LAST)
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configuration.private(LAST)
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validate_record(read_json(LAST, 32768))
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temporary = STATE / (".maintenance-" + secrets.token_hex(8))
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created = None
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try:
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install.exclusive_file(temporary, contents, 0o600)
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info = temporary.stat()
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created = (info.st_dev, info.st_ino)
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os.replace(temporary, LAST)
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install.sync_directory(STATE)
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finally:
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if created is not None and temporary.exists():
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info = temporary.lstat()
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if (info.st_dev, info.st_ino) == created:
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temporary.unlink()
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def unit(self, name: str) -> dict:
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if name not in {*APPS, *DEPENDENCIES}:
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raise DeliveryError("unknown lifecycle target")
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path = service_install.SYSTEM_UNITS / ("kf-" + name + ".service")
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if name in services.PROFILES:
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directory = service_install.known_link(path)
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base = service_install.UNITS
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elif name == "proxy":
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directory = proxy_install.known_link(path)
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base = proxy_service.UNITS
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elif name == "sandbox-factory":
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directory = factory_service.known_link(path)
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base = factory_service.UNITS
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else:
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directory = dependency_install.known_link(path)
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base = dependency_install.ROOT
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if directory != base / (
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self.selected["release_id"] + "." + self.selected["configuration_id"]
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):
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raise DeliveryError("lifecycle target is not the selected snapshot")
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values = dict(
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line.split("=", 1)
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for line in service_install.systemctl(
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"show",
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path.name,
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"--property=LoadState,ActiveState,SubState,MainPID,FragmentPath",
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).splitlines()
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if "=" in line
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)
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if values.get("LoadState") != "loaded" or values.get("FragmentPath") not in {
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str(path),
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str(directory / path.name),
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}:
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raise DeliveryError("lifecycle manager target differs")
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return values
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@staticmethod
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def empty_cgroup(name: str) -> None:
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directory = Path("/sys/fs/cgroup/kfonlinejudge.slice/kf-" + name + ".service")
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try:
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directory.lstat()
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except FileNotFoundError:
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return
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if directory.is_symlink() or not directory.is_dir():
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raise DeliveryError("unknown residual service cgroup")
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pending = [directory]
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seen = 0
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while pending:
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group = pending.pop()
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seen += 1
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if seen > 64:
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raise DeliveryError("service cgroup tree exceeds bound")
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processes = group / "cgroup.procs"
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with processes.open() as source:
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members = source.read(4097)
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if len(members) > 4096 or members.strip():
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raise DeliveryError("service processes remain; no capacity release")
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for child in group.iterdir():
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if child.is_symlink():
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raise DeliveryError("unknown cgroup entry")
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if child.is_dir():
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pending.append(child)
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def change(self, name: str, operation: str) -> None:
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if name == "sandbox-factory" and operation == "start":
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self.record["root_cleanup_confirmed"] = False
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values = self.unit(name)
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if operation == "start" and values["ActiveState"] == "active":
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node_health.inspect_unit(name, self.selected)
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return
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if operation == "stop" and values["ActiveState"] == "inactive" and values["MainPID"] == "0":
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self.empty_cgroup(name)
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return
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if operation not in {"start", "stop"}:
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raise DeliveryError("unexpected lifecycle operation")
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self.record["events"].append({"unit": name, "operation": operation, "confirmed": False})
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self.save("dispatching_" + operation)
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service_install.systemctl("--no-block", operation, "kf-" + name + ".service")
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deadline = time.monotonic() + (130 if operation == "start" else 50)
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while True:
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if install.selection(check_configuration=False) != self.selected:
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raise DeliveryError("selected binding changed during maintenance")
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values = self.unit(name)
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if (
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operation == "start"
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and values["ActiveState"] == "active"
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and values["SubState"] == "running"
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):
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node_health.inspect_unit(name, self.selected)
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break
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if (
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operation == "stop"
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and values["ActiveState"] == "inactive"
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and values["MainPID"] == "0"
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):
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self.empty_cgroup(name)
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break
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if time.monotonic() >= deadline or values["ActiveState"] == "failed":
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raise DeliveryError("bounded lifecycle operation unconfirmed")
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time.sleep(0.5)
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self.record["events"][-1]["confirmed"] = True
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self.save(operation + "_confirmed")
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def snapshot(self) -> dict:
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owner = node_health.http(
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"http://127.0.0.1:8100/internal/operations/status",
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token=self.coordinator["platform_token"],
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)
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counters = node_health.validate_execution(owner, self.coordinator["admission"])
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result = {
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"execution": counters,
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"outbox": operator_units.run("outbox-health", self.payload),
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"imports": operator_units.run("import-health", self.payload),
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"broker": operator_units.run("broker-health", self.payload),
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"factory": operator_units.run("factory-health", self.payload),
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}
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node_health.validate_factory(result["factory"], digest(self.paths["runtime.json"]))
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return result
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def root_stopped(self) -> None:
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values = self.unit("sandbox-factory")
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if values["ActiveState"] != "inactive" or values["MainPID"] != "0":
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raise DeliveryError("Root factory stop unconfirmed")
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self.empty_cgroup("sandbox-factory")
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for name in ("tasks", "identities", "captures"):
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path = Path("/var/lib/kf-judge") / name
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try:
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path.lstat()
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except FileNotFoundError:
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continue
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preflight.protected(path, directory=True)
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if next(path.iterdir(), None) is not None:
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raise DeliveryError("task/identity/capture resources remain")
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delegated = Path("/sys/fs/cgroup/kfonlinejudge.slice/kf-judge-tasks")
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if delegated.exists():
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preflight.protected(delegated, directory=True)
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if (delegated / "cgroup.procs").read_text().strip() or any(
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p.is_dir() or p.is_symlink() for p in delegated.iterdir()
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):
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raise DeliveryError("delegated task resources remain")
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socket = Path("/var/lib/kf-judge/factory/control.sock")
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try:
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socket.lstat()
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except FileNotFoundError:
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pass
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else:
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raise DeliveryError("factory socket remains; explicit recovery required")
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self.record["root_cleanup_confirmed"] = True
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self.save("root_stop_proven")
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def drain(self) -> None:
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availability.write(self.selected, "draining")
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self.save("admission_closed")
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# API remains available for accepted artifact/source reads, cancellation
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# and receipt-bound uploads. No new submission/import/write is admitted.
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deadline = time.monotonic() + DRAIN_SECONDS
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while True:
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snapshot = self.snapshot()
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if projection_empty(snapshot):
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self.record["drain_projection"] = snapshot
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break
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if time.monotonic() >= deadline:
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raise DeliveryError("drain deadline expired; owners retain unfinished work")
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time.sleep(2)
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# Every process/child and final Root resource proof remains required.
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# No row, notification, identity lease or replay journal is removed here.
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for name in ("proxy", "api", "outbox", "problem-import", "worker"):
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self.change(name, "stop")
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final = self.snapshot()
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if not projection_empty(final):
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raise DeliveryError("work changed during final stop; quiescence unconfirmed")
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self.record["drain_projection"] = final
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self.change("coordinator", "stop")
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self.change("sandbox-factory", "stop")
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self.root_stopped()
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availability.write(self.selected, "quiescent")
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self.save("quiescent")
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def reuse_drained(self, previous: dict | None) -> bool:
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"""Continue a confirmed drain without querying owners already stopped."""
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gate = availability.read()
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if gate is None or gate.state != "quiescent":
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return False
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if previous is None:
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raise DeliveryError("quiescent node has no confirmed drain receipt")
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validate_record(previous)
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if (
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gate.release_id != self.selected["release_id"]
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or gate.configuration_id != self.selected["configuration_id"]
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or any(
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previous[key] != self.record[key]
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for key in ("source_sha", "configuration_id", "boot_id")
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)
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or previous["action"] not in {"drain", "stop"}
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or previous["phase"] != "complete"
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or previous["success"] is not True
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or previous["root_cleanup_confirmed"] is not True
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or any(event["confirmed"] is not True for event in previous["events"])
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or "drain_projection" not in previous
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or not projection_empty(previous["drain_projection"])
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):
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raise DeliveryError("prior drain is not this boot's selected owner-confirmed cut")
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for name in APPS:
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values = self.unit(name)
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if values["ActiveState"] != "inactive" or values["MainPID"] != "0":
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raise DeliveryError("prior drain has a running application service")
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self.empty_cgroup(name)
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self.record["drain_projection"] = previous["drain_projection"]
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self.root_stopped()
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return True
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def start(self, *, resume: bool) -> None:
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from .recovery_database import admission_guard
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with admission_guard():
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self.start_locked(resume=resume)
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def start_locked(self, *, resume: bool) -> None:
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if not resume:
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for name in APPS:
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value = self.unit(name)
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if value["ActiveState"] != "inactive" or value["MainPID"] != "0":
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raise DeliveryError("fresh start requires stopped application units")
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self.empty_cgroup(name)
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self.root_stopped()
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availability.write(self.selected, "draining")
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for name in DEPENDENCIES:
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self.change(name, "start")
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for name in START_ORDER:
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self.change(name, "start")
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ready = operator_units.run("node-health", self.payload)
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if ready.get("service_preconditions_met") is not True:
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raise DeliveryError("service preconditions unavailable; admission remains closed")
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try:
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availability.write(self.selected, "open")
|
|
ready = operator_units.run("node-health", self.payload)
|
|
if ready.get("ready_for_admission") is not True:
|
|
raise DeliveryError("admission readiness readback unconfirmed")
|
|
self.save("accepting")
|
|
except (OSError, ValueError, subprocess.SubprocessError):
|
|
self.close_failed_admission()
|
|
raise
|
|
|
|
def close_failed_admission(self) -> None:
|
|
try:
|
|
availability.write(self.selected, "draining")
|
|
return
|
|
except (OSError, ValueError, subprocess.SubprocessError):
|
|
pass
|
|
# A full/read-only availability filesystem must not leave a successful
|
|
# earlier publication accepting mutations. Stop only the verified API
|
|
# target without depending on another receipt write. Owners retain work
|
|
# and capacity; this is not a factory cleanup or terminal-state proof.
|
|
self.unit("api")
|
|
service_install.systemctl("--no-block", "stop", "kf-api.service")
|
|
deadline = time.monotonic() + 50
|
|
while True:
|
|
values = self.unit("api")
|
|
if values["ActiveState"] == "inactive" and values["MainPID"] == "0":
|
|
self.empty_cgroup("api")
|
|
return
|
|
if time.monotonic() >= deadline or values["ActiveState"] == "failed":
|
|
raise DeliveryError("admission closure/API stop unconfirmed; operator required")
|
|
time.sleep(0.5)
|
|
|
|
|
|
def run(action: str) -> dict:
|
|
operator_units.guarded("node-maintenance")
|
|
selected, paths, payload = node_health.binding()
|
|
for name in (
|
|
"lifecycle.py",
|
|
"availability.py",
|
|
"recovery_database.py",
|
|
"recovery_identity.py",
|
|
"restore.py",
|
|
"dependency_initialize.py",
|
|
):
|
|
shipped = payload / "delivery/scripts/release" / name
|
|
preflight.protected(shipped)
|
|
if digest(shipped) != digest(Path(__file__).parent / name):
|
|
raise DeliveryError("maintenance tool differs from selected delivery")
|
|
preflight.protected(STATE, directory=True)
|
|
if stat.S_IMODE(STATE.stat().st_mode) != 0o700:
|
|
raise DeliveryError("private operator state required")
|
|
lockpath = STATE / "maintenance.lock"
|
|
if not lockpath.exists():
|
|
install.exclusive_file(lockpath, b"", 0o600)
|
|
preflight.protected(lockpath)
|
|
configuration.private(lockpath)
|
|
if lockpath.stat().st_size != 0:
|
|
raise DeliveryError("unrecorded maintenance lock contents")
|
|
fd = os.open(lockpath, os.O_RDWR | os.O_NOFOLLOW | os.O_CLOEXEC)
|
|
try:
|
|
fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
|
|
# Refuse unknown history before publishing availability, including
|
|
# resume where every known service could already be running.
|
|
previous = None
|
|
if LAST.exists() or LAST.is_symlink():
|
|
preflight.protected(LAST)
|
|
configuration.private(LAST)
|
|
previous = validate_record(read_json(LAST, 32768))
|
|
maintenance = Maintenance(selected, paths, payload, action)
|
|
try:
|
|
if action in {"drain", "stop", "restart"}:
|
|
if not maintenance.reuse_drained(previous):
|
|
maintenance.drain()
|
|
if action == "stop":
|
|
for name in ("rabbitmq", "postgres"):
|
|
maintenance.change(name, "stop")
|
|
if action in {"start", "resume", "restart"}:
|
|
maintenance.start(resume=action == "resume")
|
|
maintenance.record["success"] = True
|
|
maintenance.save("complete")
|
|
except (OSError, ValueError, subprocess.SubprocessError) as error:
|
|
maintenance.record["failure_code"] = "maintenance_unconfirmed"
|
|
# Publication errors are not hidden by a successful-looking receipt.
|
|
maintenance.save("failed")
|
|
raise DeliveryError(
|
|
"maintenance failed; admission not reopened automatically"
|
|
) from error
|
|
return maintenance.record
|
|
finally:
|
|
os.close(fd)
|
|
|
|
|
|
def main() -> None:
|
|
parser = argparse.ArgumentParser(description="Fixed bounded single-node lifecycle")
|
|
parser.add_argument(
|
|
"--action",
|
|
choices=("start", "resume", "drain", "stop", "restart"),
|
|
required=True,
|
|
)
|
|
parser.add_argument("--inside", action="store_true")
|
|
args = parser.parse_args()
|
|
try:
|
|
if args.inside:
|
|
result = run(args.action)
|
|
else:
|
|
if os.getuid() != 0 or os.geteuid() != 0:
|
|
raise DeliveryError("root operator required")
|
|
selected = install.selection(check_configuration=False)
|
|
install.directory(availability.GATE.parent, 0o711)
|
|
install.directory(STATE, 0o700)
|
|
result = operator_units.run(
|
|
"node-maintenance",
|
|
install.RELEASES / selected["release_id"] / "payload",
|
|
action=args.action,
|
|
)
|
|
print(json.dumps(result, sort_keys=True))
|
|
except (OSError, ValueError, subprocess.SubprocessError) as error:
|
|
parser.exit(
|
|
1,
|
|
"Lifecycle refused: "
|
|
+ (str(error) if isinstance(error, DeliveryError) else type(error).__name__)
|
|
+ "\n",
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|