iteration

lns.lua

@@ -0,0 +1,68 @@
+args = { ... }
+
+cache = {}
+
+allow_dynamic_lns_hosts = false
+
+function lns_lookup(hostname)
+    local data = {
+        ["action"] = "lookup",
+        ["hostname"] = hostname
+    }
+
+    local lns_server_id = 7
+    if allow_dynamic_lns_hosts then
+        lns_server_id = rednet.lookup("lns", lns_server)
+        if lns_server_id == nil then
+            io.write("LNS Server not found!\n")
+            return
+        end
+    end
+
+    rednet.send(lns_server_id, data)
+
+    while true do
+        id, msg = rednet.receive()
+        if id == lns_server_id then
+            if msg == nil then
+                return nil
+            else
+                return msg
+            end
+        end
+    end
+end
+
+local action = args[1]
+if action == nil then
+    io.write("Usage: lns <action>\n")
+    return
+end
+
+if action == "lookup" then
+    local hostname = args[2]
+    if hostname == nil then
+        io.write("Usage: lns lookup <hostname>\n")
+        return
+    end
+
+    if cache[hostname] ~= nil then
+        io.write(cache[hostname])
+        return
+    end
+
+    local id = lns_lookup(hostname)
+    cache[hostname] = id
+    if id ~= nil then
+        io.write(id)
+    end
+
+else if action == "clear" then
+    local data = {
+        ["action"] = "reload"
+    }
+
+    lns_server_id = rednet.lookup("lns", lns_server)
+    rednet.send(lns_server_id, data)
+    print("Reloaded LNS Server")
+end