267 lines
8.2 KiB
Python
267 lines
8.2 KiB
Python
"""Timezone-aware datetime utilities.
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Central source for all local-time operations in the project.
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Reads the configured timezone from clock_config table (default: Asia/Shanghai).
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All backend modules should use these functions instead of bare datetime.now().
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Two time domains:
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- **Local time** (configurable offset) — for date boundaries, display timestamps,
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user-facing schedule logic. Use now(), today(), strftime(), strptime().
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- **Unix timestamps** (UTC, always) — for interval math, expiry, cooldowns.
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Use ts_now(), ts_from_local(), ts_to_local().
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The timezone is cached per-request via Flask app config to avoid DB lookups.
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"""
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import time as _time
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import threading
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from datetime import datetime, timedelta, timezone, date
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import pytz
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# Thread-local "current user" context (set by the scheduler while it processes
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# a specific user's job; request threads resolve the user from the session).
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_TLS = threading.local()
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def set_thread_user(user_id):
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"""Set the current user for this thread (scheduler per-user iteration)."""
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_TLS.user_id = user_id
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def clear_thread_user():
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try:
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del _TLS.user_id
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except AttributeError:
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pass
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def get_thread_user():
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return getattr(_TLS, "user_id", None)
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def _ctx_user_id():
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"""Resolve the current user id: request auth context first, then thread-local."""
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try:
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from flask import has_request_context, g
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if has_request_context():
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uid = getattr(g, "user_id", None)
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if uid is not None:
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return int(uid)
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except Exception:
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pass
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return getattr(_TLS, "user_id", None) or 0
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# ─── Timezone loading ───────────────────────
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_DEFAULT_TZ_STR = "Asia/Shanghai"
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_DEFAULT_UTC_OFFSET = timezone(timedelta(hours=8))
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def _load_tz() -> "pytz.BaseTzInfo":
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"""Load timezone from the current user's clock_config. Falls back to Asia/Shanghai."""
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try:
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from flask import current_app
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db_path = current_app.config.get("DB_PATH", "data.db")
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from backend.models import get_db
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db = get_db(db_path)
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row = db.execute(
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"SELECT timezone FROM clock_config WHERE is_primary=1 AND user_id=?",
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(_ctx_user_id(),)
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).fetchone()
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db.close()
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if row and row["timezone"]:
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tz_str = row["timezone"].strip()
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return pytz.timezone(tz_str)
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except Exception:
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pass
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return pytz.timezone(_DEFAULT_TZ_STR)
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def get_tz() -> "pytz.BaseTzInfo":
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"""Return the configured timezone object. Cached per user in app config."""
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try:
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from flask import current_app
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uid = _ctx_user_id()
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if hasattr(current_app, "config") and "_timezone_cache" in current_app.config:
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cache = current_app.config["_timezone_cache"]
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if uid in cache:
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return cache[uid]
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tz = _load_tz()
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if hasattr(current_app, "config"):
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cache = current_app.config.setdefault("_timezone_cache", {})
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cache[uid] = tz
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return tz
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except Exception:
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return pytz.timezone(_DEFAULT_TZ_STR)
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def clear_tz_cache():
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"""Force reload timezone on next call. Call after timezone config changes."""
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try:
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from flask import current_app
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current_app.config.pop("_timezone_cache", None)
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except Exception:
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pass
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def set_tz(tz_str: str) -> bool:
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"""Set the timezone in clock_config DB and clear cache.
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Args:
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tz_str: IANA timezone name (e.g. "Asia/Shanghai", "America/New_York")
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or UTC offset string (e.g. "UTC+8", "UTC-5")
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Returns:
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True on success, False on invalid timezone.
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"""
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# Normalize "UTC+X" / "UTC-X" to pytz-compatible
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normalized = tz_str.strip()
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if normalized.upper().startswith("UTC") or normalized.upper().startswith("UT"):
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try:
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cleaned = normalized.upper().replace("UTC", "").replace("UT", "").strip()
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sign = 1
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if cleaned.startswith("+"):
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cleaned = cleaned[1:]
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elif cleaned.startswith("-"):
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sign = -1
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cleaned = cleaned[1:]
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hours = int(cleaned)
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# Convert to an IANA-like name: pytz has FixedOffset but easiest is
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# just use a fixed-offset timezone
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import pytz
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pytz.FixedOffset(sign * hours * 60) # FixedOffset expects minutes
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except (ValueError, IndexError):
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return False
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else:
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# IANA name — validate by trying to load
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try:
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import pytz
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pytz.timezone(normalized)
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except Exception:
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return False
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# Save to DB
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try:
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from flask import current_app
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db_path = current_app.config.get("DB_PATH", "data.db")
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from backend.models import get_db
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db = get_db(db_path)
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uid = _ctx_user_id()
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db.execute(
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"UPDATE clock_config SET timezone=? WHERE is_primary=1 AND user_id=?",
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(normalized, uid)
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)
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if db.total_changes == 0:
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db.execute(
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"INSERT INTO clock_config (user_id, city, timezone, is_primary) VALUES (?, '', ?, 1)",
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(uid, normalized)
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)
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db.commit()
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db.close()
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clear_tz_cache()
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return True
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except Exception:
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return False
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def get_tz_str() -> str:
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"""Return the configured timezone as a string."""
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try:
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from flask import current_app
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db_path = current_app.config.get("DB_PATH", "data.db")
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from backend.models import get_db
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db = get_db(db_path)
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row = db.execute(
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"SELECT timezone FROM clock_config WHERE is_primary=1 AND user_id=?",
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(_ctx_user_id(),)
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).fetchone()
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db.close()
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if row and row["timezone"]:
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return row["timezone"]
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except Exception:
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pass
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return _DEFAULT_TZ_STR
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# ─── Local time functions ───────────────────
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# Use these for date boundaries, display timestamps, schedule logic.
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def now() -> datetime:
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"""Return current datetime in the configured timezone.
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This is the primary replacement for bare `datetime.now()`.
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"""
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return datetime.now(get_tz())
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def today() -> date:
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"""Return current date in the configured timezone."""
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return now().date()
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def today_str(fmt: str = "%Y%m%d") -> str:
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"""Return today's date formatted as string.
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Common format: "%Y%m%d" for DB comparisons, "%Y-%m-%d" for displays.
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"""
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return now().strftime(fmt)
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def strftime(fmt: str = "%Y-%m-%d %H:%M:%S") -> str:
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"""Return current datetime formatted as string in local timezone."""
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return now().strftime(fmt)
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def strptime(date_string: str, fmt: str) -> datetime:
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"""Parse a string into a timezone-aware datetime.
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The result is in the configured timezone. If the input string
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has no timezone info, it's assumed to be in local time.
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"""
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dt = datetime.strptime(date_string, fmt)
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return get_tz().localize(dt)
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def isoformat() -> str:
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"""Return current time in ISO 8601 format with timezone offset."""
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return now().isoformat()
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def localize(dt: datetime) -> datetime:
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"""Convert a naive datetime to timezone-aware in configured timezone.
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If dt is already timezone-aware, it's converted to local timezone.
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"""
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tz = get_tz()
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if dt.tzinfo is None:
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return tz.localize(dt)
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return dt.astimezone(tz)
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# ─── Unix timestamp utilities ───────────────
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# These are timezone-independent — always UTC for epoch math.
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def ts_now() -> float:
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"""Return current Unix timestamp (seconds since epoch, UTC).
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Equivalent to time.time(). Use for expiry, cooldowns, interval math.
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"""
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return _time.time()
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def ts_from_local(dt: datetime = None) -> float:
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"""Convert a local-timezone datetime to Unix timestamp.
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If dt is None, returns current timestamp (same as ts_now()).
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"""
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if dt is None:
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return _time.time()
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if dt.tzinfo is None:
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dt = localize(dt)
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return dt.timestamp()
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def ts_to_local(ts: float) -> datetime:
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"""Convert a Unix timestamp to local timezone datetime."""
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return datetime.fromtimestamp(ts, get_tz())
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