doc: update example

Signed-off-by: He Xian <[email protected]>

ruleset.lua

@@ -131,21 +131,25 @@ local function ping(target)
     return false, lasterr
 end
 
+if _G.ruleset then
+    -- stop old ruleset routines when reloading
+    _G.ruleset.running = false
+end
 ruleset.running = true
+ruleset.server_rtt = {}
 local function keepalive(target, tag)
     while ruleset.running do
-        local ok, result = ping(target)
-        logf("ping %q: %s", tag, result)
-        ruleset.server_rtt[tag] = result
-        await.sleep(ok and 3600 or 60)
+        local interval = 60
+        if not is_disabled() then
+            local ok, result = ping(target)
+            logf("ping %q: %s", tag, result)
+            ruleset.server_rtt[tag] = result
+            if ok then interval = 3600 end
+        end
+        await.sleep(interval)
     end
 end
 
-if _G.ruleset then
-    -- stop old ruleset routines when reloading
-    _G.ruleset.running = false
-end
-ruleset.server_rtt = {}
 for k, v in pairs(route_list) do
     local route, tag = v[1], v[2]
     local target = table.pack(route("api.neosocksd.lan:80"))