140 lines
7.4 KiB
Python
140 lines
7.4 KiB
Python
"""Causal batch quality checks and grouped anomaly episodes, no database IO."""
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from copy import deepcopy
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from datetime import datetime
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from math import isfinite
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from statistics import median
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from uuid import NAMESPACE_URL, uuid5
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import re
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from app.domain.schemas.scada_replay import ScadaReplayCreate
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def prepare_cleaning(rows: list[dict], config: ScadaReplayCreate) -> list[dict]:
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result = []
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for row in rows:
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value = row["monitored_value"]
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quality, reason = "valid", "原始值通过数值与已配置量程校验"
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if value is None:
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quality, reason = "missing", "原始读数缺失"
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elif not isfinite(float(value)):
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quality, reason = "invalid", "原始读数不是有限数值"
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else:
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bounds = config.quality_ranges.get(row["device_id"])
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if bounds and ((bounds.lower is not None and value < bounds.lower)
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or (bounds.upper is not None and value > bounds.upper)):
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quality, reason = "invalid", "超出本次明确配置的仪表量程"
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result.append({
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"time": row["time"].isoformat() if isinstance(row["time"], datetime) else row["time"],
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"device_id": row["device_id"], "source_hash": row["source_hash"],
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"monitored_value": value if value is not None and isfinite(float(value)) else None,
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"cleaned_value": value if quality == "valid" else None,
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"quality": quality, "reason": reason,
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})
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return result
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def detect_frame(document: dict, rows: list[dict], config: ScadaReplayCreate, at: datetime) -> tuple[dict, list[dict]]:
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"""Consume a complete timestamp; never treat missing data as recovery."""
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result = deepcopy(document)
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histories = result.setdefault("histories", {})
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states = result.setdefault("rule_states", {})
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latest = result.setdefault("latest", {})
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for row in rows:
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latest[row["device_id"]] = row
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by_id = {row["device_id"]: row for row in rows}
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changes = []
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devices = {device["device_id"]: device for device in result.get("devices", [])}
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for device_id in config.device_ids:
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row = by_id.get(device_id)
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invalid = row is not None and row["quality"] != "valid"
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previous = latest.get(device_id)
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frequency = str(devices.get(device_id, {}).get("transmission_frequency", ""))
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match = re.fullmatch(r"(\d+):(\d+):(\d+)", frequency)
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if match:
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seconds = int(match[1]) * 3600 + int(match[2]) * 60 + int(match[3])
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else:
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minutes = re.fullmatch(r"(\d+)\s*(?:min|分钟)", frequency)
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seconds = int(minutes[1]) * 60 if minutes else 0
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prior_time = datetime.fromisoformat(previous["time"]) if previous else config.start_time
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missing = not row and seconds > 0 and (at - prior_time).total_seconds() >= seconds * 2
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key = "quality-" + device_id
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state = states.setdefault(key, {"event": None, "recoveries": 0})
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if invalid or missing:
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state["recoveries"] = 0
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if state["event"] is None:
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event = {"event_id": str(uuid5(NAMESPACE_URL, f"{result['replay_id']}:{key}:{at.isoformat()}")),
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"rule_id": key, "device_ids": [device_id], "occurred_at": at.isoformat(),
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"last_observed_at": at.isoformat(), "status": "active", "category": "data_quality",
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"detail": row["reason"] if invalid else "连续两个设备周期未读取到观测",
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"task_id": None}
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state["event"] = event
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changes.append({**event, "change": "raised"})
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result["anomaly_count"] = result.get("anomaly_count", 0) + 1
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elif row and row["quality"] == "valid" and state["event"]:
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state["recoveries"] += 1
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if state["recoveries"] >= 2:
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changes.append({**state["event"], "status": "resolved", "resolved_at": at.isoformat(), "change": "resolved"})
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state["event"] = None
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for rule in config.rules:
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state = states.setdefault(rule.rule_id, {"hits": 0, "recoveries": 0, "event": None})
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hits, usable, reasons = [], [], []
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for device_id in rule.device_ids:
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row = by_id.get(device_id)
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if not row or row["quality"] != "valid":
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continue
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value = row["cleaned_value"]
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if rule.kind == "bounds":
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triggered = ((rule.lower is not None and value < rule.lower)
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or (rule.upper is not None and value > rule.upper))
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reason = f"{device_id}={value} {rule.unit}，超出配置范围"
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else:
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previous = histories.get(device_id, [])[-rule.window_samples:]
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if len(previous) < rule.minimum_samples:
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continue
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baseline = median(previous)
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if baseline == 0:
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continue
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change = (value - baseline) / abs(baseline) * 100
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triggered = (abs(change) >= rule.threshold if rule.direction == "both"
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else change >= rule.threshold if rule.direction == "increase"
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else change <= -rule.threshold)
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reason = f"{device_id} 较历史中位值变化 {change:.1f}%，阈值 {rule.threshold}%"
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usable.append(device_id)
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if triggered:
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hits.append(device_id)
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reasons.append(reason)
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if len(hits) >= rule.minimum_devices:
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state["hits"] += 1
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state["recoveries"] = 0
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if state["event"] is None and state["hits"] >= rule.consecutive_samples:
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event_id = str(uuid5(NAMESPACE_URL, f"{result['replay_id']}:{rule.rule_id}:{at.isoformat()}"))
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event = {"event_id": event_id, "rule_id": rule.rule_id, "device_ids": hits,
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"occurred_at": at.isoformat(), "last_observed_at": at.isoformat(),
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"status": "active", "detail": "；".join(reasons)[:2000], "task_id": None}
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state["event"] = event
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changes.append({**event, "change": "raised"})
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result["anomaly_count"] = result.get("anomaly_count", 0) + 1
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elif state["event"]:
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state["event"]["last_observed_at"] = at.isoformat()
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elif len(usable) == len(rule.device_ids):
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state["hits"] = 0
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if state["event"]:
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state["recoveries"] += 1
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if state["recoveries"] >= rule.recovery_samples:
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event = {**state["event"], "status": "resolved", "resolved_at": at.isoformat(),
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"change": "resolved"}
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changes.append(event)
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state["event"] = None
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state["recoveries"] = 0
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# Incomplete frames cannot count as a consecutive hit/recovery.
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elif not usable and any(device in by_id for device in rule.device_ids):
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state["hits"] = state["recoveries"] = 0
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frozen = {device for rule in config.rules if states[rule.rule_id]["event"]
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for device in rule.device_ids}
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for row in rows:
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if row["quality"] == "valid" and row["device_id"] not in frozen:
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history = histories.setdefault(row["device_id"], [])
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history.append(row["cleaned_value"])
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histories[row["device_id"]] = history[-96:]
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result["processed_count"] = result.get("processed_count", 0) + len(rows)
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return result, changes
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