added ping uptime test

measurement/run_ping.py

@@ -0,0 +1,82 @@
+import subprocess
+import re
+import time
+import itertools
+from db import init_ping_db, insert_ping_result
+from config import PING_INTERVAL
+
+# Curated pool of well-known, stable IPs across DNS resolvers, CDNs, and captive-portal check targets.
+# Cycling 3 at a time means each IP is hit at most once every ~(len(pool)/3 * PING_INTERVAL) seconds.
+IP_POOL = [
+    # DNS resolvers
+    "1.1.1.1",          # Cloudflare
+    "1.0.0.1",          # Cloudflare
+    "8.8.8.8",          # Google
+    "8.8.4.4",          # Google
+    "9.9.9.9",          # Quad9
+    "149.112.112.112",  # Quad9
+    "208.67.222.222",   # OpenDNS
+    "208.67.220.220",   # OpenDNS
+    "64.6.64.6",        # Verisign
+    "84.200.69.80",     # DNS.WATCH
+]
+
+TARGETS_PER_ITERATION = 3
+
+_LATENCY_RE = re.compile(r"time[=<](\d+(?:\.\d+)?)\s*ms")
+
+
+def detect_gateway() -> str | None:
+    try:
+        with open("/proc/net/route") as f:
+            for line in f.readlines()[1:]:  # skip header row
+                fields = line.strip().split()
+                # Destination == "00000000" means 0.0.0.0 — the default/catch-all route
+                if fields[1] == "00000000":
+                    addr = int(fields[2], 16)  # little-endian hex
+                    return ".".join(str((addr >> (8 * i)) & 0xFF) for i in range(4))
+    except Exception as e:
+        print(f"WARNING: gateway detection failed: {e}", flush=True)
+    return None
+
+
+def ping_once(ip: str) -> tuple[bool, float | None]:
+    result = subprocess.run(
+        ["ping", "-c", "1", "-W", "2", ip],
+        capture_output=True, text=True
+    )
+    if result.returncode != 0:
+        return False, None
+    m = _LATENCY_RE.search(result.stdout)
+    latency = float(m.group(1)) if m else None
+    return True, latency
+
+
+def run():
+    init_ping_db()
+    gateway_ip = detect_gateway()
+    if gateway_ip:
+        print(f"Gateway detected: {gateway_ip}", flush=True)
+    else:
+        print("WARNING: No gateway detected, skipping gateway checks", flush=True)
+
+    pool = itertools.cycle(IP_POOL)
+
+    while True:
+        if gateway_ip:
+            success, latency_ms = ping_once(gateway_ip)
+            insert_ping_result(gateway_ip, success, latency_ms, is_gateway=True)
+            status = f"{latency_ms:.1f}ms" if latency_ms is not None else "FAIL"
+            print(f"[GW] {gateway_ip}: {status}", flush=True)
+
+        targets = [next(pool) for _ in range(TARGETS_PER_ITERATION)]
+        for ip in targets:
+            success, latency_ms = ping_once(ip)
+            insert_ping_result(ip, success, latency_ms)
+            status = f"{latency_ms:.1f}ms" if latency_ms is not None else "FAIL"
+            print(f"{ip}: {status}", flush=True)
+        time.sleep(PING_INTERVAL)
+
+
+if __name__ == "__main__":
+    run()