Initial commit: LogHive centralized log management system

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/app/config.py

@@ -0,0 +1,79 @@
+"""LogHive configuration."""
+
+import os
+from datetime import datetime, timezone, timedelta
+from typing import Optional
+
+# Beijing timezone offset
+_BEIJING_TZ = timezone(timedelta(hours=8))
+
+
+def to_display_time(dt: datetime) -> str:
+    """Convert a UTC datetime to Beijing time for display.
+    Returns ISO format without timezone suffix (e.g. '2026-05-08T14:30:00')."""
+    if dt is None:
+        return None
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    local = dt.astimezone(_BEIJING_TZ)
+    return local.strftime("%Y-%m-%dT%H:%M:%S")
+
+
+def from_query_time(dt: Optional[datetime]) -> Optional[datetime]:
+    """Interpret a naive datetime query param as Beijing time, return UTC datetime."""
+    if dt is None:
+        return None
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=_BEIJING_TZ)
+    return dt.astimezone(timezone.utc)
+
+
+class Settings:
+    """Application settings loaded from environment variables."""
+
+    # Service name
+    SERVICE_NAME: str = "LogHive"
+
+    # API
+    API_HOST: str = os.getenv("API_HOST", "0.0.0.0")
+    API_PORT: int = int(os.getenv("API_PORT", "8000"))
+    DEBUG: bool = os.getenv("DEBUG", "false").lower() == "true"
+    CORS_ORIGINS: list[str] = os.getenv("CORS_ORIGINS", "*").split(",")
+
+    # Security
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "change-me-in-production")
+    TOKEN_EXPIRE_HOURS: int = int(os.getenv("TOKEN_EXPIRE_HOURS", "720"))
+
+    # PostgreSQL
+    DATABASE_URL: str = os.getenv(
+        "DATABASE_URL",
+        "postgresql+asyncpg://LogHive:LogHive@localhost:5432/LogHive",
+    )
+
+    # Redis
+    REDIS_URL: str = os.getenv("REDIS_URL", "redis://localhost:6379/0")
+
+    # Celery
+    CELERY_BROKER_URL: str = os.getenv("CELERY_BROKER_URL", "redis://localhost:6379/1")
+    CELERY_RESULT_BACKEND: str = os.getenv(
+        "CELERY_RESULT_BACKEND", "redis://localhost:6379/2"
+    )
+
+    # Log retention (days)
+    LOG_RETENTION_DAYS: int = int(os.getenv("LOG_RETENTION_DAYS", "30"))
+    LOG_COLD_STORAGE_DAYS: int = int(os.getenv("LOG_COLD_STORAGE_DAYS", "7"))
+
+    # Rate limit
+    RATE_LIMIT_PER_SECOND: int = int(os.getenv("RATE_LIMIT_PER_SECOND", "1000"))
+
+    # Alert
+    ALERT_CHECK_INTERVAL_SECONDS: int = int(
+        os.getenv("ALERT_CHECK_INTERVAL_SECONDS", "60")
+    )
+
+    # Notification
+    FEISHU_WEBHOOK_URL: Optional[str] = os.getenv("FEISHU_WEBHOOK_URL", None)
+    DINGTALK_WEBHOOK_URL: Optional[str] = os.getenv("DINGTALK_WEBHOOK_URL", None)
+
+
+settings = Settings()