1 files changed, 18 insertions, 0 deletions
diff --git a/shard/lib/net/addr.ex b/shard/lib/net/addr.ex
index c1d2f05..b92ae70 100644
--- a/shard/lib/net/addr.ex
+++ b/shard/lib/net/addr.ex
@@ -1,4 +1,10 @@
 defmodule SNet.Addr do
+  @moduledoc"""
+  Helper module for getting our IP addresses.
+
+  Runs an agent that gets our public IPv4 address on the internet and stores it.
+  """
+
   use Agent
 
   require Logger
@@ -21,6 +27,9 @@ defmodule SNet.Addr do
     end
   end
 
+  @doc"""
+  Reteurn the list of IPv4 address for our network interfaces.
+  """
   def get_if_inet4 do
     {:ok, ifs} = :inet.getifaddrs
     for {_, opts} <- ifs,
@@ -32,15 +41,24 @@ defmodule SNet.Addr do
     end
   end
 
+  @doc"""
+  Return our public IPv4 address as observed by an external API provider (`ipify.org`)
+  """
   def get_pub_inet4 do
     Agent.get(__MODULE__, &(&1))
   end
 
+  @doc"""
+  Get all our IPv4 addresses.
+  """
   def get_all_inet4 do
     addrset = for x <- get_if_inet4() ++ get_pub_inet4(), into: %MapSet{}, do: x
     MapSet.to_list addrset
   end
 
+  @doc"""
+  Determines if an IP address is ours or not.
+  """
   def is_local?({:inet, ip, port}) do
     port == Application.get_env(:shard, :port) and (ip == {127,0,0,1} or ip in get_all_inet4())
   end