Add Fly.io deployment utils and instructions

lib/ex_webrtc/ice/fly_ip_filter.ex

@@ -0,0 +1,22 @@
+defmodule ExWebRTC.ICE.FlyIpFilter do
+  @moduledoc """
+  ICE IP filter for Fly.io deployments.
+
+  This module defines a single function, which filters out IP addresses,
+  which ICE Agent will use as its host candidates.
+  """
+
+  @spec ip_filter(:inet.ip_address()) :: boolean()
+  def ip_filter(ip_address) do
+    case :inet.gethostbyname(~c"fly-global-services") do
+      # Assume that fly-global-services has to resolve
+      # to a single ipv4 address.
+      # In other case, don't even try to connect.
+      {:ok, {:hostent, _, _, :inet, 4, [addr]}} ->
+        addr == ip_address
+
+      _ ->
+        false
+    end
+  end
+end

lib/ex_webrtc/peer_connection/configuration.ex

@@ -5,6 +5,7 @@ defmodule ExWebRTC.PeerConnection.Configuration do
 
   require Logger
 
+  alias ExICE.ICEAgent
   alias ExWebRTC.{RTPCodecParameters, SDPUtils}
   alias ExSDP.Attribute.{Extmap, FMTP, RTCPFeedback}
 
@@ -148,7 +149,7 @@ defmodule ExWebRTC.PeerConnection.Configuration do
           controlling_process: Process.dest(),
           ice_servers: [ice_server()],
           ice_transport_policy: :relay | :all,
-          ice_ip_filter: (:inet.ip_address() -> boolean()),
+          ice_ip_filter: ICEAgent.ip_filter(),
           ice_port_range: Enumerable.t(non_neg_integer()),
           audio_codecs: [RTPCodecParameters.t()],
           video_codecs: [RTPCodecParameters.t()],

mix.exs

@@ -57,7 +57,8 @@ defmodule ExWebRTC.MixProject do
   defp deps do
     [
       {:ex_sdp, "~> 1.0"},
-      {:ex_ice, "~> 0.8.0"},
+      # {:ex_ice, "~> 0.8.0"},
+      {:ex_ice, github: "elixir-webrtc/ex_ice", override: true},
       {:ex_dtls, "~> 0.16.0"},
       {:ex_libsrtp, "~> 0.7.1"},
       {:ex_rtp, "~> 0.4.0"},

mix.lock

@@ -13,7 +13,7 @@
   "erlex": {:hex, :erlex, "0.2.7", "810e8725f96ab74d17aac676e748627a07bc87eb950d2b83acd29dc047a30595", [:mix], [], "hexpm", "3ed95f79d1a844c3f6bf0cea61e0d5612a42ce56da9c03f01df538685365efb0"},
   "ex_doc": {:hex, :ex_doc, "0.31.2", "8b06d0a5ac69e1a54df35519c951f1f44a7b7ca9a5bb7a260cd8a174d6322ece", [:mix], [{:earmark_parser, "~> 1.4.39", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.1", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "317346c14febaba9ca40fd97b5b5919f7751fb85d399cc8e7e8872049f37e0af"},
   "ex_dtls": {:hex, :ex_dtls, "0.16.0", "3ae38025ccc77f6db573e2e391602fa9bbc02253c137d8d2d59469a66cbe806b", [:mix], [{:bundlex, "~> 1.5.3", [hex: :bundlex, repo: "hexpm", optional: false]}, {:unifex, "~> 1.0", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "2a4e30d74c6ddf95cc5b796423293c06a0da295454c3823819808ff031b4b361"},
-  "ex_ice": {:hex, :ex_ice, "0.8.0", "f9bd181e8fd2f8ac9a808587ee8a47bf667143069d75f6e4892a62156d798aa7", [:mix], [{:elixir_uuid, "~> 1.0", [hex: :elixir_uuid, repo: "hexpm", optional: false]}, {:ex_stun, "~> 0.2.0", [hex: :ex_stun, repo: "hexpm", optional: false]}, {:ex_turn, "~> 0.1.0", [hex: :ex_turn, repo: "hexpm", optional: false]}], "hexpm", "b0476f6b18986f6df48fda4cecb3be5022323572790d1bb49da10b177c936b4e"},
+  "ex_ice": {:git, "https://github.com/elixir-webrtc/ex_ice.git", "4c5190687e11b28a8209f2c930895647d0b2a64c", []},
   "ex_libsrtp": {:hex, :ex_libsrtp, "0.7.2", "211bd89c08026943ce71f3e2c0231795b99cee748808ed3ae7b97cd8d2450b6b", [:mix], [{:bunch, "~> 1.6", [hex: :bunch, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.3", [hex: :bundlex, repo: "hexpm", optional: false]}, {:membrane_precompiled_dependency_provider, "~> 0.1.0", [hex: :membrane_precompiled_dependency_provider, repo: "hexpm", optional: false]}, {:unifex, "~> 1.1", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "2e20645d0d739a4ecdcf8d4810a0c198120c8a2f617f2b75b2e2e704d59f492a"},
   "ex_rtcp": {:hex, :ex_rtcp, "0.4.0", "f9e515462a9581798ff6413583a25174cfd2101c94a2ebee871cca7639886f0a", [:mix], [], "hexpm", "28956602cf210d692fcdaf3f60ca49681634e1deb28ace41246aee61ee22dc3b"},
   "ex_rtp": {:hex, :ex_rtp, "0.4.0", "1f1b5c1440a904706011e3afbb41741f5da309ce251cb986690ce9fd82636658", [:mix], [], "hexpm", "0f72d80d5953a62057270040f0f1ee6f955c08eeae82ac659c038001d7d5a790"},