mirror of
https://github.com/lynchaos/ashvale-station.git
synced 2026-09-12 12:47:49 +00:00
kemal
9d2e884b74
Shutdown hang, the cause of every restart taking systemd's full 90 s timeout and ending in SIGKILL: /api/stream looped forever with no disconnect or shutdown check, so an open dashboard was an in-flight request that never completed and uvicorn's graceful shutdown waited on it. Reproduced cleanly: with no stream client the process stopped in 2 s, with one open client it was still running after 15 s. Fixed by bounding timeout_graceful_shutdown, and by having the generator exit on client disconnect and on a shutdown event. Now 7 s with a client attached. Equations rendered as blank boxes whenever the KaTeX CDN was unreachable, which is a real case for a Pi on wifi. The elements carried the TeX only in a data attribute, so with no KaTeX there was nothing to display. The source is now written into the element as text first and KaTeX replaces it, so it degrades to readable TeX. Verified by aborting the katex request. A window load handler re-runs typesetting for a slow CDN. The code comment claiming this fallback already existed was wrong and is corrected.
569 lines
20 KiB
Python
569 lines
20 KiB
Python
# Copyright 2026 Kemal Yaylali
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""HTTP surface. Thin by design: every endpoint is a view over station state.
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Backwards compatibility matters here, so `/api/telemetry` returns a
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superset of the original payload. Anything already pointed at this Pi
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keeps working, and the new fields are simply there when you want them.
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"""
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from __future__ import annotations
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import asyncio
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import json
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import time
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from contextlib import asynccontextmanager
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from typing import Any, Dict, List, Optional
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import numpy as np
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from fastapi import FastAPI, HTTPException, Query, Request
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from fastapi.responses import HTMLResponse, StreamingResponse
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from pydantic import BaseModel, Field
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from .config import CONFIG
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from .dashboard import DASHBOARD_HTML
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from .features import FEATURE_NAMES
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from .led import LedDisplay
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from .methods import describe
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from .station import Station
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station: Optional[Station] = None
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display: Optional[LedDisplay] = None
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# Set when the app is shutting down. The SSE generator watches it: without
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# that, an open dashboard is an in-flight request that never completes, so
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# uvicorn's graceful shutdown blocks until systemd's timeout SIGKILLs the
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# process. Reproduced: with no stream client the service stops in 2 s, with
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# one open client it was still running after 15 s.
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_shutdown = asyncio.Event()
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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global station, display
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station = Station(CONFIG)
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station.sample_once()
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station.start()
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if CONFIG.server.led_enabled:
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display = LedDisplay(station, CONFIG.server.led_cycle_s)
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display.start()
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try:
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yield
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finally:
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_shutdown.set()
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if display is not None:
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await display.stop()
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if station is not None:
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await station.stop()
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app = FastAPI(
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title="Ashvale Station",
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version="1.0.0",
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description="Sense HAT v2 telemetry with online forecasting, calibrated "
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"uncertainty, drift detection and verification.",
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lifespan=lifespan,
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)
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def _st() -> Station:
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if station is None:
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raise HTTPException(503, "station not started")
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return station
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def _clean(obj: Any) -> Any:
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"""JSON is not a superset of IEEE 754. NaN in a response body will
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silently break a browser's JSON.parse, which is a miserable bug to
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chase from a dashboard that just shows dashes."""
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if isinstance(obj, dict):
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return {k: _clean(v) for k, v in obj.items()}
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if isinstance(obj, (list, tuple)):
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return [_clean(v) for v in obj]
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if isinstance(obj, (np.floating, float)):
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f = float(obj)
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return None if (f != f or f in (float("inf"), float("-inf"))) else round(f, 6)
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if isinstance(obj, (np.integer,)):
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return int(obj)
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if isinstance(obj, np.ndarray):
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return _clean(obj.tolist())
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return obj
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# --------------------------------------------------------------- models
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class LabelIn(BaseModel):
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kind: str = Field("rain", description="rain | fog | frost | window_open")
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value: float = Field(..., ge=0.0, le=1.0)
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ts: Optional[float] = None
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note: str = ""
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class CalibrationIn(BaseModel):
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reference_c: Optional[float] = Field(None, description="Trusted air temperature in C")
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reset: bool = Field(False, description="Discard the learned coefficient and its "
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"covariance, returning to the configured prior")
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class HumidityCalibrationIn(BaseModel):
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reference_pct: Optional[float] = Field(None, ge=0, le=100,
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description="Trusted relative humidity in %")
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reset: bool = Field(False, description="Discard the learned offset, returning to "
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"the configured prior")
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# ------------------------------------------------------------ endpoints
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@app.get("/api/telemetry")
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def telemetry() -> Dict:
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st = _st()
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live = st.live or st.sample_once()
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colour = live.get("colour") or {}
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return _clean({
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# original contract, preserved
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"timestamp": live.get("timestamp"),
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"temperature": live.get("temp_smooth"),
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"humidity": live.get("hum_smooth"),
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"pressure": live.get("press_slp"),
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"compass": live.get("compass"),
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"pitch": live.get("pitch"),
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"roll": live.get("roll"),
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"yaw": live.get("yaw"),
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"accel": {"x": live.get("ax"), "y": live.get("ay"), "z": live.get("az")},
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"gyro": {"x": live.get("gx"), "y": live.get("gy"), "z": live.get("gz")},
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"color": {"clear": colour.get("clear", live.get("lux", 0)),
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"red": colour.get("red", live.get("r", 0)),
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"green": colour.get("green", live.get("g", 0)),
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"blue": colour.get("blue", live.get("b", 0)),
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"hex": colour.get("hex", "#334155"),
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"cct": colour.get("cct")},
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# everything the ML layer adds
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"temperature_raw": live.get("temp_raw"),
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"temperature_compensated": live.get("temp_c"),
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"pressure_station": live.get("press_smooth"),
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"cpu_temp": live.get("cpu_temp"),
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"cpu_offset": live.get("cpu_offset"),
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"compensator_k": live.get("compensator_k"),
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"hum_offset": live.get("hum_offset"),
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"hum_psychrometric": live.get("hum_psychrometric"),
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"rates": {
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"temperature_c_per_h": live.get("temp_rate"),
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"humidity_pct_per_h": live.get("hum_rate"),
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"pressure_hpa_per_h": live.get("press_rate"),
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},
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"derived": {
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"dew_point": live.get("dew_c"),
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"dew_depression": live.get("dew_depression"),
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"wet_bulb": live.get("wet_bulb"),
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"vpd_hpa": live.get("vpd"),
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"absolute_humidity_g_m3": live.get("abs_humidity"),
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"heat_index": live.get("heat_index"),
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"cloud_index": live.get("cloud_index"),
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"solar_elevation": live.get("solar_elevation"),
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"solar_azimuth": live.get("solar_azimuth"),
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"clear_sky_wm2": live.get("clear_sky_wm2"),
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},
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"health": live.get("health"),
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"novelty_d2": live.get("novelty_d2"),
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"simulated": live.get("simulated"),
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})
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@app.get("/api/history")
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def history(hours: float = Query(6.0, gt=0, le=24 * 90),
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max_points: int = Query(720, ge=10, le=5000)) -> Dict:
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st = _st()
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cols = ["ts", "temp_smooth", "hum_smooth", "press_slp", "dew_c",
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"temp_rate", "press_rate", "lux"]
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w = st.store.window(hours, cols)
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n = w["ts"].size
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if n == 0:
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return {"n": 0, "series": {}}
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stride = max(1, n // max_points)
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out = {c: w[c][::stride] for c in cols}
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return _clean({
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"n": int(out["ts"].size),
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"hours": hours,
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"series": {
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"ts": out["ts"].tolist(),
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"temperature": out["temp_smooth"].tolist(),
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"humidity": out["hum_smooth"].tolist(),
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"pressure": out["press_slp"].tolist(),
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"dew_point": out["dew_c"].tolist(),
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"temperature_rate": out["temp_rate"].tolist(),
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"pressure_rate": out["press_rate"].tolist(),
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"lux": out["lux"].tolist(),
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},
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})
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@app.get("/api/history/range")
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def history_range(start: Optional[float] = None, end: Optional[float] = None,
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hours: Optional[float] = None,
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bucket: Optional[int] = Query(None, ge=30, le=604800)) -> Dict:
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"""Bucket-aggregated telemetry for an arbitrary window.
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Accepts either an explicit epoch `start`/`end` pair or a trailing
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`hours` span. The bucket is chosen automatically from the span unless
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you pin it, so a request for a year does not try to serialise a year
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of five-minute rows to a browser.
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"""
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st = _st()
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now = time.time()
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if hours is not None:
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start, end = now - hours * 3600.0, now
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if start is None or end is None:
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raise HTTPException(422, "provide start and end, or hours")
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if end - start > 366 * 86400:
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raise HTTPException(422, "range limited to one year")
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data = st.store.range_series(start, end, bucket)
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return _clean(data)
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@app.get("/api/history/daily")
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def history_daily(days: int = Query(30, ge=1, le=400)) -> Dict:
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st = _st()
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end = time.time()
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start = end - days * 86400.0
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return _clean({"days": st.store.daily_summary(start, end)})
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@app.get("/api/records")
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def records() -> Dict:
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"""All-time extremes held by this station, each with its timestamp."""
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return _clean(_st().store.extremes())
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@app.get("/api/storage")
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def storage_stats() -> Dict:
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"""Rows per resolution tier plus database size, so retention is visible."""
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st = _st()
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return _clean({
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**st.store.storage_stats(),
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"policy": {
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"raw_retention_days": CONFIG.storage.raw_retention_days,
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"five_min_retention_days": CONFIG.storage.five_min_retention_days,
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"note": "Nothing is deleted, only downsampled. Rows older than the raw "
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"window fold into 5-minute means, then into hourly means. A "
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"year of history lands around 30 MB.",
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},
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})
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@app.get("/api/export.csv")
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def export_csv(start: Optional[float] = None, end: Optional[float] = None,
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hours: Optional[float] = None):
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st = _st()
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now = time.time()
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if hours is not None:
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start, end = now - hours * 3600.0, now
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if start is None or end is None:
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raise HTTPException(422, "provide start and end, or hours")
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stamp = time.strftime("%Y%m%d-%H%M", time.localtime(start))
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return StreamingResponse(
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st.store.iter_csv(start, end),
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media_type="text/csv",
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headers={"Content-Disposition":
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f'attachment; filename="ashvale-{stamp}.csv"'},
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)
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@app.get("/api/methods")
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def methods_doc() -> Dict:
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"""The Methods tab is generated from this, so it cannot drift from the code."""
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return _clean(describe(CONFIG))
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@app.get("/api/forecast")
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def forecast(target: Optional[str] = None, refresh: bool = False) -> Dict:
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st = _st()
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if refresh or not st.forecast_bundle:
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st.refresh_forecasts()
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# A cold station has no forecast yet. Return the empty shape rather than
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# a bare {}, so a client never has to distinguish "no data" from "no key".
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bundle = dict(st.forecast_bundle) or {
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"issued_ts": None, "anchors": {},
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"targets": {t: [] for t in CONFIG.model.targets},
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"warming_up": True,
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}
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if target:
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if target not in bundle.get("targets", {}):
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raise HTTPException(404, f"unknown target '{target}'")
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bundle["targets"] = {target: bundle["targets"][target]}
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return _clean(bundle)
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@app.get("/api/outlook")
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def outlook() -> Dict:
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"""Days 2 to 7. Climatology plus a decaying anomaly, honestly labelled."""
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st = _st()
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if not st.outlook_bundle:
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st.refresh_forecasts()
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base = st.outlook_bundle or {
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"issued_ts": None, "ready": False, "annual_terms": False,
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"history_days": round(st.store.span_days(), 2),
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"targets": {t: [] for t in CONFIG.model.targets},
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}
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return _clean({
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**base,
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"method": "harmonic climatology with exponentially decaying anomaly",
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"caveat": "A single point sensor cannot observe approaching systems. "
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"Treat days 2 to 7 as a climatological outlook, not a forecast.",
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})
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@app.get("/api/precipitation")
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def precipitation() -> Dict:
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st = _st()
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return _clean(st.precip_bundle or {})
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@app.get("/api/anomaly")
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def anomaly() -> Dict:
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st = _st()
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return _clean({
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**(st.anomaly_bundle or {}),
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"events": st.monitor.recent(20),
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})
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@app.get("/api/models")
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def models() -> Dict:
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st = _st()
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return _clean({
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"nowcast": st.nowcast.diagnostics(),
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"climatology": {
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"ready": st.climatology.ready,
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"annual_terms": st.climatology.use_annual,
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"history_days": round(st.climatology.n_days, 2),
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"residual_std": st.climatology.resid_std,
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},
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"precipitation": {
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"coefficients": st.precip.coefficients(),
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"strong_labels": st.precip.n_strong,
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"weak_labels": st.precip.n_weak,
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"logloss_ewma": st.precip.ewma_logloss,
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},
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"calibration": st.tracker.compensator.to_dict(),
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})
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@app.get("/api/nerd")
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def nerd() -> Dict:
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"""Every internal number the estimator and the learners are carrying.
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Deliberately read-only and computed from live objects rather than stored, so
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it cannot drift from what the station is actually using. Everything here is
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cheap: no matrix inversions, no queries beyond what the caller already pays
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for. `theta` is returned per head so the UI can show which of the 33 features
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each horizon actually leans on, which is the single most revealing view of
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what the model has learned.
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"""
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st = _st()
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tr = st.tracker
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filters = {}
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for name, kf in tr.filters.items():
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P = np.asarray(kf.P, dtype=float)
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filters[name] = {
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"level": float(kf.x[0]), "rate_per_h": float(kf.x[1]) * 3600.0,
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"nis": float(kf.nis),
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"p_level": float(P[0, 0]), "p_rate": float(P[1, 1]),
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"p_cross": float(P[0, 1]),
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"sigma_level": float(np.sqrt(max(P[0, 0], 0.0))),
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"q": float(kf.q), "r": float(kf.r),
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"initialised": bool(kf.initialised),
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}
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heads = []
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for (target, h), head in sorted(st.nowcast.heads.items()):
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m = head.model
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P = np.asarray(m.P, dtype=float)
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theta = np.asarray(m.theta, dtype=float)
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heads.append({
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"target": target, "horizon_s": h,
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"n_updates": int(m.n_updates),
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"trace_p": float(np.trace(P)),
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"theta_norm": float(np.linalg.norm(theta)),
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"rmse_ewma": float(np.sqrt(max(m.ewma_sq_error, 0.0))),
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"lam": float(m.lam), "p_max": float(m.p_max),
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"eff_memory": float(1.0 / max(1.0 - m.lam, 1e-9)),
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"alpha": float(head.conformal.alpha),
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"alpha_target": float(head.conformal.alpha_target),
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"coverage": (float(head.conformal.empirical_coverage)
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if np.isfinite(head.conformal.empirical_coverage) else None),
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"halfwidth": (float(head.conformal.quantile())
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if np.isfinite(head.conformal.quantile()) else None),
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"weights": {k: float(v) for k, v in
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zip(("persistence", "climatology", "learned"), head.weights)},
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"theta": [round(float(v), 6) for v in theta],
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})
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mono = st.monitor
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nov = getattr(mono, "novelty", None)
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ph = getattr(mono, "drift", None)
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monitoring = {
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"novelty": {
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"d2": float(getattr(nov, "last_d2", 0.0)) if nov is not None else None,
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"threshold": float(getattr(nov, "threshold", 0.0)) if nov is not None else None,
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"n": int(getattr(nov, "n", 0)) if nov is not None else None,
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"dims": int(getattr(nov, "d", 0)) if nov is not None else None,
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"z": [round(float(v), 4) for v in np.asarray(getattr(nov, "z", []), dtype=float)]
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if nov is not None else [],
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},
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"drift": {
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"m_pos": float(getattr(ph, "m_pos", 0.0)) if ph is not None else None,
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"m_neg": float(getattr(ph, "m_neg", 0.0)) if ph is not None else None,
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"mean": float(getattr(ph, "mean", 0.0)) if ph is not None else None,
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"n": int(getattr(ph, "n", 0)) if ph is not None else None,
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"alarms": int(getattr(ph, "n_alarms", 0)) if ph is not None else None,
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"delta": float(getattr(ph, "delta", 0.0)) if ph is not None else None,
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},
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}
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return _clean({
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"feature_names": list(FEATURE_NAMES),
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"filters": filters,
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"compensators": {
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"thermal": tr.compensator.to_dict(),
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"humidity": tr.hum_compensator.to_dict(),
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},
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"heads": heads,
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"climatology": {
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"ready": st.climatology.ready,
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"annual_terms": st.climatology.use_annual,
|
|
"history_days": round(st.climatology.n_days, 3),
|
|
"diurnal_harmonics": st.climatology.kd,
|
|
"annual_harmonics": st.climatology.ka,
|
|
"ridge": st.climatology.ridge,
|
|
"residual_std": st.climatology.resid_std,
|
|
"n_coefficients": {k: len(v) for k, v in st.climatology.coef.items()},
|
|
},
|
|
"precipitation": {
|
|
"coefficients": st.precip.coefficients(),
|
|
"strong_labels": st.precip.n_strong,
|
|
"weak_labels": st.precip.n_weak,
|
|
"logloss_ewma": st.precip.ewma_logloss,
|
|
},
|
|
"monitoring": monitoring,
|
|
})
|
|
|
|
|
|
@app.get("/api/scorecard")
|
|
def scorecard() -> Dict:
|
|
st = _st()
|
|
rows = st.store.scorecard()
|
|
return _clean({
|
|
"rows": rows,
|
|
"explainer": "skill = 1 - MAE/MAE_persistence. Above zero means the "
|
|
"model beats 'nothing changes'. Below zero means it does not, "
|
|
"and persistence should be shipped instead.",
|
|
})
|
|
|
|
|
|
@app.post("/api/verify")
|
|
def verify_now() -> Dict:
|
|
return _clean(_st().verify())
|
|
|
|
|
|
@app.post("/api/train")
|
|
def train_now(hours: float = Query(24 * 30, gt=1)) -> Dict:
|
|
return _clean(_st().train(hours))
|
|
|
|
|
|
@app.post("/api/label")
|
|
def add_label(body: LabelIn) -> Dict:
|
|
return _clean(_st().add_label(body.kind, body.value, body.ts, body.note))
|
|
|
|
|
|
@app.post("/api/calibrate")
|
|
def calibrate(body: CalibrationIn) -> Dict:
|
|
st = _st()
|
|
if body.reset:
|
|
return _clean(st.reset_calibration())
|
|
if body.reference_c is None:
|
|
raise HTTPException(422, "provide reference_c, or reset=true")
|
|
result = st.calibrate_temperature(body.reference_c)
|
|
if "error" in result:
|
|
raise HTTPException(409, result["error"])
|
|
return _clean(result)
|
|
|
|
|
|
@app.post("/api/calibrate/humidity")
|
|
def calibrate_humidity(body: HumidityCalibrationIn) -> Dict:
|
|
st = _st()
|
|
if body.reset:
|
|
return _clean(st.reset_humidity_calibration())
|
|
if body.reference_pct is None:
|
|
raise HTTPException(422, "provide reference_pct, or reset=true")
|
|
result = st.calibrate_humidity(body.reference_pct)
|
|
if "error" in result:
|
|
raise HTTPException(409, result["error"])
|
|
return _clean(result)
|
|
|
|
|
|
@app.get("/api/status")
|
|
def status() -> Dict:
|
|
st = _st()
|
|
return _clean({
|
|
**st.status(),
|
|
"display_frame": display.frame_name if display else None,
|
|
"events": st.store.recent_events(15),
|
|
})
|
|
|
|
|
|
@app.get("/api/events")
|
|
def events(limit: int = Query(50, ge=1, le=500)) -> List[Dict]:
|
|
return _clean(_st().store.recent_events(limit))
|
|
|
|
|
|
@app.get("/api/stream")
|
|
async def stream(request: Request):
|
|
"""Server-sent events. One connection instead of a poll every 2 seconds,
|
|
which on a Zero 2 W is the difference between 4% and 0.4% CPU.
|
|
|
|
The loop exits on shutdown or client disconnect. Both matter: an endless
|
|
generator keeps the response in flight, and uvicorn will not finish a
|
|
graceful shutdown while one is open.
|
|
"""
|
|
async def gen():
|
|
while not _shutdown.is_set():
|
|
if await request.is_disconnected():
|
|
break
|
|
st = _st()
|
|
payload = {
|
|
"telemetry": telemetry(),
|
|
"precipitation": _clean(st.precip_bundle or {}),
|
|
"health": st.monitor.health.overall,
|
|
"drift_stress": round(st.monitor.drift.stress, 3),
|
|
}
|
|
yield f"data: {json.dumps(payload)}\n\n"
|
|
# Wait on the shutdown event rather than sleeping blindly, so a stop
|
|
# is honoured immediately instead of up to 2 s later.
|
|
try:
|
|
await asyncio.wait_for(_shutdown.wait(), timeout=2.0)
|
|
except asyncio.TimeoutError:
|
|
pass
|
|
|
|
return StreamingResponse(gen(), media_type="text/event-stream",
|
|
headers={"Cache-Control": "no-cache",
|
|
"X-Accel-Buffering": "no"})
|
|
|
|
|
|
@app.get("/", response_class=HTMLResponse)
|
|
def dashboard() -> str:
|
|
return DASHBOARD_HTML
|