391 lines
15 KiB
Python
391 lines
15 KiB
Python
"""Vehicle Map static server and server-side proxy for the vehicle open platform."""
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from concurrent.futures import ThreadPoolExecutor
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import hashlib
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from http.server import HTTPServer, SimpleHTTPRequestHandler
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import json
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import os
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from pathlib import Path
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import threading
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import time
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from socketserver import ThreadingMixIn
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from urllib.error import HTTPError, URLError
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from urllib.parse import urlencode, urlparse
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from urllib.request import Request, urlopen
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ROOT = Path(__file__).resolve().parent
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def _static_asset_version():
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"""Content fingerprint used to bypass upstream static-asset caches on release."""
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digest = hashlib.sha256()
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for filename in ("app.js", "styles.css"):
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digest.update((ROOT / filename).read_bytes())
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return digest.hexdigest()[:16]
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STATIC_ASSET_VERSION = _static_asset_version()
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HOST = os.getenv("VEHICLE_MAP_HOST", "0.0.0.0")
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PORT = int(os.getenv("VEHICLE_MAP_PORT", "20800"))
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OPEN_PLATFORM_BASE_URL = os.getenv("OPEN_PLATFORM_BASE_URL", "https://open.d.lnoneos.com").rstrip("/")
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OPEN_PLATFORM_APP_KEY = os.getenv("OPEN_PLATFORM_APP_KEY", "").strip()
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UPSTREAM_TIMEOUT_SECONDS = float(os.getenv("UPSTREAM_TIMEOUT_SECONDS", "15"))
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DASHBOARD_CACHE_SECONDS = int(os.getenv("DASHBOARD_CACHE_SECONDS", "120"))
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STATION_CACHE_SECONDS = int(os.getenv("STATION_CACHE_SECONDS", "120"))
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AMAP_REGEOCODE_KEY = os.getenv("AMAP_REGEOCODE_KEY", "").strip()
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STATION_GEOCODE_CACHE_SECONDS = int(os.getenv("STATION_GEOCODE_CACHE_SECONDS", "604800"))
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STATION_GEOCODE_CACHE_PATH = Path(os.getenv(
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"STATION_GEOCODE_CACHE_PATH", str(ROOT / ".station-geocode-cache.json")
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))
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_cache_lock = threading.Lock()
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_cache = {}
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_cache_load_locks = {}
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_station_geocode_cache_lock = threading.Lock()
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_station_geocode_cache = None
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_station_geocode_cache_dirty = False
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class ThreadingHTTPServer(ThreadingMixIn, HTTPServer):
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daemon_threads = True
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allow_reuse_address = True
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def _json_bytes(value):
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return json.dumps(value, ensure_ascii=False, separators=(",", ":")).encode("utf-8")
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def _post_open_platform(path, body):
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if not OPEN_PLATFORM_APP_KEY:
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raise RuntimeError("OPEN_PLATFORM_APP_KEY is not configured")
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request = Request(
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OPEN_PLATFORM_BASE_URL + path,
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data=_json_bytes(body),
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method="POST",
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headers={
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"Authorization": "Bearer " + OPEN_PLATFORM_APP_KEY,
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"Content-Type": "application/json",
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"Accept": "application/json",
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"User-Agent": "lingniu-vehicle-map/1.0",
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},
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)
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try:
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with urlopen(request, timeout=UPSTREAM_TIMEOUT_SECONDS) as response:
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payload = json.load(response)
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except HTTPError as exc:
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detail = exc.read(2048).decode("utf-8", errors="replace")
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raise RuntimeError(f"open platform returned HTTP {exc.code}: {detail}") from exc
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except URLError as exc:
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raise RuntimeError(f"open platform unavailable: {exc.reason}") from exc
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if payload.get("code") != "SUCCESS":
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raise RuntimeError(f"open platform rejected request: {payload.get('code')} {payload.get('message')}")
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return payload.get("data") or []
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def _cached(key, ttl_seconds, loader):
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now = time.time()
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with _cache_lock:
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cached = _cache.get(key)
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if cached and now - cached[0] < ttl_seconds:
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return cached[1]
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load_lock = _cache_load_locks.setdefault(key, threading.Lock())
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# Startup prewarming and the first browser request can arrive together.
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# Coalesce them so a cold geocode cache is filled only once.
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with load_lock:
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now = time.time()
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with _cache_lock:
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cached = _cache.get(key)
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if cached and now - cached[0] < ttl_seconds:
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return cached[1]
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value = loader()
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with _cache_lock:
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_cache[key] = (now, value)
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return value
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def _station_coordinate_key(station):
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try:
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return "{:.6f},{:.6f}".format(float(station.get("longitude")), float(station.get("latitude")))
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except (TypeError, ValueError):
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return ""
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def _component_value(value):
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if isinstance(value, list):
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return str(value[0]).strip() if value else ""
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return str(value or "").strip()
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def _load_station_geocode_cache():
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global _station_geocode_cache
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with _station_geocode_cache_lock:
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if _station_geocode_cache is not None:
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return _station_geocode_cache
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try:
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with STATION_GEOCODE_CACHE_PATH.open("r", encoding="utf-8") as handle:
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payload = json.load(handle)
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_station_geocode_cache = payload if isinstance(payload, dict) else {}
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except (OSError, ValueError, TypeError):
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_station_geocode_cache = {}
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return _station_geocode_cache
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def _persist_station_geocode_cache():
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try:
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STATION_GEOCODE_CACHE_PATH.parent.mkdir(parents=True, exist_ok=True)
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temporary = STATION_GEOCODE_CACHE_PATH.with_suffix(STATION_GEOCODE_CACHE_PATH.suffix + ".tmp")
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with temporary.open("w", encoding="utf-8") as handle:
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json.dump(_station_geocode_cache, handle, ensure_ascii=False, separators=(",", ":"))
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os.replace(str(temporary), str(STATION_GEOCODE_CACHE_PATH))
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except OSError as exc:
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print("station geocode cache write deferred: {}".format(exc))
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def _reverse_geocode_station(longitude, latitude):
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if not AMAP_REGEOCODE_KEY:
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raise RuntimeError("AMAP_REGEOCODE_KEY is not configured")
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query = urlencode({
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"key": AMAP_REGEOCODE_KEY,
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"location": "{:.6f},{:.6f}".format(longitude, latitude),
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"extensions": "base",
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"radius": "1000",
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"batch": "false",
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})
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request = Request(
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"https://restapi.amap.com/v3/geocode/regeo?" + query,
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headers={"Accept": "application/json", "User-Agent": "lingniu-station-geocoder/1.0"},
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)
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try:
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with urlopen(request, timeout=UPSTREAM_TIMEOUT_SECONDS) as response:
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payload = json.load(response)
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except (HTTPError, URLError, ValueError) as exc:
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raise RuntimeError("AMap reverse geocode unavailable: {}".format(exc)) from exc
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if payload.get("status") != "1":
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raise RuntimeError("AMap reverse geocode rejected request: {} {}".format(payload.get("infocode"), payload.get("info")))
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component = (payload.get("regeocode") or {}).get("addressComponent") or {}
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province = _component_value(component.get("province"))
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city = _component_value(component.get("city")) or province
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district = _component_value(component.get("district"))
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if not province:
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raise RuntimeError("AMap reverse geocode returned no province")
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return {"province": province, "city": city, "district": district, "adcode": _component_value(component.get("adcode"))}
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def _station_region_from_gps(station, now=None):
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global _station_geocode_cache_dirty
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coordinate_key = _station_coordinate_key(station)
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if not coordinate_key:
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return {"province": "", "city": "", "district": ""}
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now = time.time() if now is None else now
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cache = _load_station_geocode_cache()
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cached = cache.get(coordinate_key) or {}
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if now - float(cached.get("updatedAt") or 0) < STATION_GEOCODE_CACHE_SECONDS:
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return cached.get("region") or {"province": "", "city": "", "district": ""}
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try:
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longitude, latitude = (float(value) for value in coordinate_key.split(","))
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region = _reverse_geocode_station(longitude, latitude)
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except Exception as exc:
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print("station reverse geocode deferred for {}: {}".format(coordinate_key, exc))
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return cached.get("region") or {"province": "", "city": "", "district": ""}
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with _station_geocode_cache_lock:
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cache[coordinate_key] = {"updatedAt": now, "region": region}
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_station_geocode_cache_dirty = True
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return region
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def _stations_with_gps_regions(stations):
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global _station_geocode_cache_dirty
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def enrich(station):
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item = dict(station)
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region = _station_region_from_gps(item)
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# Never fall back to data-table administrative fields. The raw address
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# remains untouched and is the only directly displayed location text.
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item.update({key: region.get(key, "") for key in ("province", "city", "district")})
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return item
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with ThreadPoolExecutor(max_workers=8) as executor:
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enriched = list(executor.map(enrich, stations))
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with _station_geocode_cache_lock:
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if _station_geocode_cache_dirty:
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_persist_station_geocode_cache()
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_station_geocode_cache_dirty = False
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return enriched
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def _load_stations():
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return _cached(
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"stations",
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STATION_CACHE_SECONDS,
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lambda: _stations_with_gps_regions(_post_open_platform("/api/v1/hydrogen-stations/query", {})),
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)
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def _public_station_directory():
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stations = _load_stations()
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fields = ("id", "name", "shortName", "province", "city", "district", "address", "longitude", "latitude", "cooperative")
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directory = [{field: station.get(field) for field in fields if station.get(field) is not None} for station in stations]
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return {
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"status": "ok",
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"asOf": time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
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"summary": {
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"totalStations": len(directory),
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"cooperativeStations": sum(1 for station in directory if station.get("cooperative")),
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},
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"stations": directory,
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}
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def _load_dashboard():
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today = time.strftime("%Y-%m-%d", time.localtime())
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with ThreadPoolExecutor(max_workers=3) as executor:
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realtime_future = executor.submit(
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_post_open_platform, "/api/v1/vehicles/realtime/query", {}
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)
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mileage_future = executor.submit(
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_post_open_platform, "/api/v1/vehicles/mileage/query", {"date": today}
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)
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stations_future = executor.submit(_load_stations)
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vehicles = realtime_future.result()
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mileage_rows = mileage_future.result()
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stations = stations_future.result()
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mileage_by_vin = {
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row.get("vin"): row
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for row in mileage_rows
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if row.get("vin") and row.get("status") == "NORMAL"
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}
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# The daily activity view places every vehicle that reported
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# today is placed in exactly one bucket using its latest selected speed.
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active_vehicles = [item for item in vehicles if item.get("activeToday")]
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driving = sum(1 for item in active_vehicles if float(item.get("speedKmh") or 0) > 3)
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idle = len(active_vehicles) - driving
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offline = sum(1 for item in vehicles if item.get("motionStatus") == "offline")
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active_today = len(active_vehicles)
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daily_mileage = round(
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sum(float(row.get("dailyMileageKm") or 0) for row in mileage_rows), 3
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)
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monthly_hydrogen = round(
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sum(float(station.get("monthlyHydrogenKg") or 0) for station in stations), 3
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)
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for vehicle in vehicles:
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mileage = mileage_by_vin.get(vehicle.get("vin"), {})
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vehicle["dailyMileageKm"] = mileage.get("dailyMileageKm", 0)
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return {
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"status": "ok",
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"asOf": time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
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"date": today,
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"summary": {
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"totalVehicles": len(vehicles),
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"onlineVehicles": active_today,
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"drivingVehicles": driving,
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"idleVehicles": idle,
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"offlineVehicles": offline,
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"todayMileageKm": daily_mileage,
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"monthlyHydrogenKg": monthly_hydrogen,
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"totalStations": len(stations),
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"cooperativeStations": sum(1 for item in stations if item.get("cooperative")),
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},
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"vehicles": vehicles,
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"stations": stations,
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}
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def _prewarm_dashboard_cache():
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"""Warm the first dashboard snapshot after a process restart.
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A warm snapshot lets the first visitor receive the cached response instead
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of waiting for the three upstream requests to complete.
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"""
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try:
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_cached("dashboard", DASHBOARD_CACHE_SECONDS, _load_dashboard)
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except Exception as exc: # A later request can retry; startup must stay available.
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print(f"vehicle map cache warmup deferred: {exc}")
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class VehicleMapHandler(SimpleHTTPRequestHandler):
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server_version = "LingniuVehicleMap/1.0"
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def do_GET(self):
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path = urlparse(self.path).path
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if path in {"/", "/index.html"}:
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self._serve_index()
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return
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if path == "/api/health":
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self._write_json(200, {
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"status": "ok",
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"service": "vehicle-map",
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"openPlatformConfigured": bool(OPEN_PLATFORM_APP_KEY),
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})
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return
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if path == "/api/dashboard":
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try:
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payload = _cached("dashboard", DASHBOARD_CACHE_SECONDS, _load_dashboard)
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self._write_json(200, payload)
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except Exception as exc: # keep upstream details server-side only
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self.log_error("dashboard refresh failed: %s", exc)
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self._write_json(502, {
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"status": "error",
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"code": "UPSTREAM_UNAVAILABLE",
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"message": "地图数据暂时不可用，请稍后重试",
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})
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return
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if path == "/api/stations":
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try:
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self._write_json(200, _public_station_directory())
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except Exception as exc:
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self.log_error("station directory refresh failed: %s", exc)
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self._write_json(502, {
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"status": "error",
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"code": "UPSTREAM_UNAVAILABLE",
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"message": "加氢站数据暂时不可用，请稍后重试",
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})
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return
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super().do_GET()
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def _serve_index(self):
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try:
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template = (ROOT / "index.html").read_text(encoding="utf-8")
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body = template.replace("__ASSET_VERSION__", STATIC_ASSET_VERSION).encode("utf-8")
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except OSError as exc:
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self.log_error("index template unavailable: %s", exc)
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self.send_error(500, "Map application is temporarily unavailable")
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return
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self.send_response(200)
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self.send_header("Content-Type", "text/html; charset=utf-8")
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self.send_header("Content-Length", str(len(body)))
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self.send_header("Cache-Control", "no-cache")
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self.end_headers()
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self.wfile.write(body)
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def end_headers(self):
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if self.path == "/" or self.path.split("?", 1)[0].endswith((".html", ".css", ".js", ".svg")):
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self.send_header("Cache-Control", "no-cache")
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self.send_header("X-Content-Type-Options", "nosniff")
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self.send_header("Referrer-Policy", "strict-origin-when-cross-origin")
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self.send_header("X-Frame-Options", "SAMEORIGIN")
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super().end_headers()
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def _write_json(self, status, payload, headers=None):
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body = _json_bytes(payload)
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self.send_response(status)
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self.send_header("Content-Type", "application/json; charset=utf-8")
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self.send_header("Cache-Control", "no-store")
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self.send_header("Content-Length", str(len(body)))
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for name, value in (headers or {}).items():
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self.send_header(name, value)
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self.end_headers()
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self.wfile.write(body)
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if __name__ == "__main__":
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server = ThreadingHTTPServer((HOST, PORT), VehicleMapHandler)
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threading.Thread(target=_prewarm_dashboard_cache, daemon=True).start()
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print(f"Lingniu Vehicle Map listening on http://{HOST}:{PORT}")
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try:
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server.serve_forever()
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except KeyboardInterrupt:
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pass
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finally:
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server.server_close()
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