1 files changed, 24 insertions, 8 deletions
diff --git a/shard/lib/net/addr.ex b/shard/lib/net/addr.ex
index 630f95a..c1d2f05 100644
--- a/shard/lib/net/addr.ex
+++ b/shard/lib/net/addr.ex
@@ -1,4 +1,25 @@
 defmodule SNet.Addr do
+  use Agent
+
+  require Logger
+
+  def start_link(_) do
+    Agent.start_link(__MODULE__, :init, [], name: __MODULE__)
+  end
+
+  def init() do
+    Application.ensure_all_started(:inets)
+    Application.ensure_all_started(:ssl)
+    case :httpc.request('http://api.ipify.org') do
+      {:ok, {_, _, body}} ->
+        {:ok, addr} = :inet.parse_address body
+        Logger.info "Public IP address: #{body}"
+        [addr]
+      _ ->
+        Logger.info "Could not get public IP address"
+        []
+    end
+  end
 
   def get_if_inet4 do
     {:ok, ifs} = :inet.getifaddrs
@@ -12,20 +33,15 @@ defmodule SNet.Addr do
   end
 
   def get_pub_inet4 do
-    Application.ensure_all_started(:inets)
-    Application.ensure_all_started(:ssl)
-    {:ok, {_, _, body}} = :httpc.request('http://api.ipify.org')
-    {:ok, addr} = :inet.parse_address body
-    addr
+    Agent.get(__MODULE__, &(&1))
   end
 
   def get_all_inet4 do
-    addrset = for x <- get_if_inet4(), into: %MapSet{}, do: x
-    addrset = MapSet.put(addrset, get_pub_inet4())
+    addrset = for x <- get_if_inet4() ++ get_pub_inet4(), into: %MapSet{}, do: x
     MapSet.to_list addrset
   end
 
   def is_local?({:inet, ip, port}) do
-    port == Application.get_env(:shard, :port) and (ip == {127,0,0,1} or ip in get_if_inet4())
+    port == Application.get_env(:shard, :port) and (ip == {127,0,0,1} or ip in get_all_inet4())
   end
 end