refactor: rename package directory fabledscryer → roundtable

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

roundtable/monitors/ping.py

@@ -0,0 +1,69 @@
+from __future__ import annotations
+import asyncio
+import logging
+import time
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from fabledscryer.core.alerts import record_metric
+from fabledscryer.models.hosts import Host, ProbeType
+from fabledscryer.models.monitors import PingResult, PingStatus
+
+logger = logging.getLogger(__name__)
+
+TCP_TIMEOUT = 5.0
+DEFAULT_TCP_PORT = 80
+
+
+async def ping_check(host: Host, session: AsyncSession) -> None:
+    """Probe a single host and write ping_result + metrics."""
+    if host.probe_type == ProbeType.icmp:
+        result = await _icmp_ping(host.address)
+    else:
+        result = await _tcp_ping(host.address, host.probe_port or DEFAULT_TCP_PORT)
+
+    status = PingStatus.up if result["up"] else PingStatus.down
+    session.add(PingResult(
+        host_id=host.id,
+        status=status,
+        response_time_ms=result.get("response_time_ms"),
+    ))
+    await session.flush()
+
+    await record_metric(session, "ping", host.name, "up", 1.0 if result["up"] else 0.0)
+    await record_metric(
+        session, "ping", host.name, "response_time_ms",
+        result.get("response_time_ms") or 0.0,
+    )
+
+
+async def _tcp_ping(address: str, port: int) -> dict:
+    start = time.monotonic()
+    try:
+        reader, writer = await asyncio.wait_for(
+            asyncio.open_connection(address, port),
+            timeout=TCP_TIMEOUT,
+        )
+        writer.close()
+        await writer.wait_closed()
+        return {"up": True, "response_time_ms": round((time.monotonic() - start) * 1000, 2)}
+    except Exception:
+        return {"up": False, "response_time_ms": None}
+
+
+async def _icmp_ping(address: str) -> dict:
+    """Use system ping command (setuid binary; no raw socket privilege needed in Python)."""
+    start = time.monotonic()
+    try:
+        proc = await asyncio.create_subprocess_exec(
+            "ping", "-c", "1", "-W", "2", address,
+            stdout=asyncio.subprocess.DEVNULL,
+            stderr=asyncio.subprocess.DEVNULL,
+        )
+        await asyncio.wait_for(proc.wait(), timeout=5.0)
+        if proc.returncode == 0:
+            return {"up": True, "response_time_ms": round((time.monotonic() - start) * 1000, 2)}
+        return {"up": False, "response_time_ms": None}
+    except Exception as exc:
+        logger.warning(f"ICMP ping failed for {address}: {exc}, falling back to TCP")
+        return await _tcp_ping(address, DEFAULT_TCP_PORT)