feat: add adguard client

apps/dashboard/backend/app/clients/adguard_client.py

@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+import logging
+
+from app.clients.base import BaseHTTPClient
+from app.config import Settings
+from app.models.sources import AdGuardSnapshot
+
+
+logger = logging.getLogger(__name__)
+
+
+class AdGuardClient(BaseHTTPClient):
+    """
+    Reads DNS statistics from AdGuard Home's /control/stats endpoint.
+    Requires Basic Auth (username + password).
+    """
+
+    def __init__(self, settings: Settings) -> None:
+        super().__init__(settings, "adguard", settings.adguard_base_url)
+
+    async def fetch_stats(self) -> AdGuardSnapshot:
+        snapshot = AdGuardSnapshot()
+        if not self.base_url:
+            logger.info("adguard skipped: base URL missing")
+            return snapshot
+
+        if not self.settings.adguard_username or not self.settings.adguard_password:
+            logger.info("adguard skipped: no credentials configured")
+            return snapshot
+
+        data = await self._request_json(
+            "GET",
+            "/control/stats",
+            auth=(self.settings.adguard_username, self.settings.adguard_password),
+        )
+
+        if data is None:
+            logger.warning("adguard: empty or failed response")
+            return snapshot
+
+        total = int(data.get("num_dns_queries") or 0)
+        blocked = int(data.get("num_blocked_filtering") or 0)
+        avg_ms = round(float(data.get("avg_processing_time") or 0.0) * 1000, 2)
+        blocked_pct = round((blocked / total * 100), 1) if total > 0 else 0.0
+
+        result = AdGuardSnapshot(
+            source_status="online",
+            total_queries=total,
+            blocked_queries=blocked,
+            blocked_percent=blocked_pct,
+            avg_processing_ms=avg_ms,
+        )
+        logger.info("adguard stats: %s", result.model_dump())
+        return result