Implement the chat example properly

examples/chat/lib/chat.ex

@@ -7,7 +7,8 @@ defmodule Chat do
   @impl true
   def start(_type, _args) do
     children = [
-      {Bandit, plug: __MODULE__.Router, ip: @ip, port: @port}
+      {Bandit, plug: __MODULE__.Router, ip: @ip, port: @port},
+      {Registry, name: __MODULE__.PubSub, keys: :duplicate}
     ]
 
     Supervisor.start_link(children, strategy: :one_for_one)

examples/chat/lib/chat/peer_handler.ex

@@ -2,6 +2,7 @@ defmodule Chat.PeerHandler do
   require Logger
 
   alias ExWebRTC.{
+    DataChannel,
     ICECandidate,
     PeerConnection,
     SessionDescription
@@ -16,8 +17,12 @@ defmodule Chat.PeerHandler do
   @impl true
   def init(_) do
     {:ok, pc} = PeerConnection.start_link(ice_servers: @ice_servers)
+    {:ok, _} = Registry.register(Chat.PubSub, "chat", [])
 
-    state = %{peer_connection: pc}
+    state = %{
+      peer_connection: pc,
+      channel_id: nil
+    }
 
     {:ok, state}
   end
@@ -34,6 +39,12 @@ defmodule Chat.PeerHandler do
     handle_webrtc_msg(msg, state)
   end
 
+  @impl true
+  def handle_info({:chat_msg, msg}, state) do
+    :ok = PeerConnection.send_data(state.peer_connection, state.channel_id, msg)
+    {:ok, state}
+  end
+
   @impl true
   def terminate(reason, _state) do
     Logger.warning("WebSocket connection was terminated, reason: #{inspect(reason)}")
@@ -79,7 +90,18 @@ defmodule Chat.PeerHandler do
     {:push, {:text, msg}, state}
   end
 
-  # TODO: implement stuff
+  defp handle_webrtc_msg({:data_channel, %DataChannel{id: id}}, state) do
+    state = %{state | channel_id: id}
+    {:ok, state}
+  end
+
+  defp handle_webrtc_msg({:data, id, data}, %{channel_id: id} = state) do
+    Registry.dispatch(Chat.PubSub, "chat", fn entries ->
+      for {pid, _} <- entries, do: send(pid, {:chat_msg, data})
+    end)
+
+    {:ok, state}
+  end
 
   defp handle_webrtc_msg(_msg, state), do: {:ok, state}
 end

examples/chat/mix.lock

@@ -7,12 +7,13 @@
   "crc": {:hex, :crc, "0.10.5", "ee12a7c056ac498ef2ea985ecdc9fa53c1bfb4e53a484d9f17ff94803707dfd8", [:mix, :rebar3], [{:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "3e673b6495a9525c5c641585af1accba59a1eb33de697bedf341e247012c2c7f"},
   "elixir_make": {:hex, :elixir_make, "0.8.4", "4960a03ce79081dee8fe119d80ad372c4e7badb84c493cc75983f9d3bc8bde0f", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:certifi, "~> 2.0", [hex: :certifi, repo: "hexpm", optional: true]}], "hexpm", "6e7f1d619b5f61dfabd0a20aa268e575572b542ac31723293a4c1a567d5ef040"},
   "elixir_uuid": {:hex, :elixir_uuid, "1.2.1", "dce506597acb7e6b0daeaff52ff6a9043f5919a4c3315abb4143f0b00378c097", [:mix], [], "hexpm", "f7eba2ea6c3555cea09706492716b0d87397b88946e6380898c2889d68585752"},
-  "ex_dtls": {:hex, :ex_dtls, "0.15.2", "6c8c0f8eb67525216551bd3e0322ab33c9d851d56ef3e065efab4fd277a8fbb9", [:mix], [{:unifex, "~> 1.0", [hex: :unifex, repo: "hexpm", optional: false]}], "hexpm", "6b852bc926bbdc9c1b9c4ecc6cfc73a89d4e106042802cefea2c1503072a9f2a"},
-  "ex_ice": {:hex, :ex_ice, "0.7.1", "3ad14f7281ece304dfee227e332b8a67d93d5857602a8a4300a826c250af136e", [: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", "78e6bc4abb5294dcf0a474d0a91e78a829916291d846a0e255867dc5db8733e7"},
+  "ex_dtls": {:git, "https://github.com/elixir-webrtc/ex_dtls.git", "dff8ec1998dfb556b2d3dafbd30574d0da18b958", []},
+  "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_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"},
-  "ex_sdp": {:hex, :ex_sdp, "0.17.0", "4c50e7814f01f149c0ccf258fba8428f8567dffecf1c416ec3f6aaaac607a161", [:mix], [{:bunch, "~> 1.3", [hex: :bunch, repo: "hexpm", optional: false]}, {:elixir_uuid, "~> 1.2", [hex: :elixir_uuid, repo: "hexpm", optional: false]}], "hexpm", "c7fe0625902be2a835b5fe6834a189f7db7639d2625c8e9d8b3564e6d704145f"},
+  "ex_sctp": {:git, "https://github.com/elixir-webrtc/ex_sctp.git", "1576207bda0eba3634a2b0075899042e9b309e60", []},
+  "ex_sdp": {:hex, :ex_sdp, "1.0.0", "c66cd66d60ad03ff1eecdc6db6a1b8a7b89fec260fcc22e8d6703fc5bbf430a3", [:mix], [{:bunch, "~> 1.3", [hex: :bunch, repo: "hexpm", optional: false]}, {:elixir_uuid, "~> 1.2", [hex: :elixir_uuid, repo: "hexpm", optional: false]}], "hexpm", "e165dff988b8ab9d93588636aa5f3f683e1f848fc63b78b12382c8fa3dd39216"},
   "ex_stun": {:hex, :ex_stun, "0.2.0", "feb1fc7db0356406655b2a617805e6c712b93308c8ea2bf0ba1197b1f0866deb", [:mix], [], "hexpm", "1e01ba8290082ccbf37acaa5190d1f69b51edd6de2026a8d6d51368b29d115d0"},
   "ex_turn": {:hex, :ex_turn, "0.1.0", "177405aadf3d754567d0d37cf881a83f9cacf8f45314d188633b04c4a9e7c1ec", [:mix], [{:ex_stun, "~> 0.2.0", [hex: :ex_stun, repo: "hexpm", optional: false]}], "hexpm", "d677737fb7d45274d5dac19fe3c26b9038b6effbc0a6b3e7417bccc76b6d1cd3"},
   "finch": {:hex, :finch, "0.18.0", "944ac7d34d0bd2ac8998f79f7a811b21d87d911e77a786bc5810adb75632ada4", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6 or ~> 1.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "69f5045b042e531e53edc2574f15e25e735b522c37e2ddb766e15b979e03aa65"},
@@ -27,9 +28,11 @@
   "plug_crypto": {:hex, :plug_crypto, "2.1.0", "f44309c2b06d249c27c8d3f65cfe08158ade08418cf540fd4f72d4d6863abb7b", [:mix], [], "hexpm", "131216a4b030b8f8ce0f26038bc4421ae60e4bb95c5cf5395e1421437824c4fa"},
   "qex": {:hex, :qex, "0.5.1", "0d82c0f008551d24fffb99d97f8299afcb8ea9cf99582b770bd004ed5af63fd6", [:mix], [], "hexpm", "935a39fdaf2445834b95951456559e9dc2063d0a055742c558a99987b38d6bab"},
   "req": {:hex, :req, "0.5.6", "8fe1eead4a085510fe3d51ad854ca8f20a622aae46e97b302f499dfb84f726ac", [:mix], [{:brotli, "~> 0.3.1", [hex: :brotli, repo: "hexpm", optional: true]}, {:ezstd, "~> 1.0", [hex: :ezstd, repo: "hexpm", optional: true]}, {:finch, "~> 0.17", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:mime, "~> 2.0.6 or ~> 2.1", [hex: :mime, repo: "hexpm", optional: false]}, {:nimble_csv, "~> 1.0", [hex: :nimble_csv, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: true]}], "hexpm", "cfaa8e720945d46654853de39d368f40362c2641c4b2153c886418914b372185"},
+  "rustler": {:hex, :rustler, "0.34.0", "e9a73ee419fc296a10e49b415a2eb87a88c9217aa0275ec9f383d37eed290c1c", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:req, "~> 0.5", [hex: :req, repo: "hexpm", optional: false]}, {:toml, "~> 0.6", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "1d0c7449482b459513003230c0e2422b0252245776fe6fd6e41cb2b11bd8e628"},
   "shmex": {:hex, :shmex, "0.5.1", "81dd209093416bf6608e66882cb7e676089307448a1afd4fc906c1f7e5b94cf4", [:mix], [{:bunch_native, "~> 0.5.0", [hex: :bunch_native, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.0", [hex: :bundlex, repo: "hexpm", optional: false]}], "hexpm", "c29f8286891252f64c4e1dac40b217d960f7d58def597c4e606ff8fbe71ceb80"},
   "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
   "thousand_island": {:hex, :thousand_island, "1.3.5", "6022b6338f1635b3d32406ff98d68b843ba73b3aa95cfc27154223244f3a6ca5", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "2be6954916fdfe4756af3239fb6b6d75d0b8063b5df03ba76fd8a4c87849e180"},
+  "toml": {:hex, :toml, "0.7.0", "fbcd773caa937d0c7a02c301a1feea25612720ac3fa1ccb8bfd9d30d822911de", [:mix], [], "hexpm", "0690246a2478c1defd100b0c9b89b4ea280a22be9a7b313a8a058a2408a2fa70"},
   "unifex": {:hex, :unifex, "1.2.0", "90d1ec5e6d788350e07e474f7bd8b0ee866d6606beb9ca4e20dbb26328712a84", [:mix], [{:bunch, "~> 1.0", [hex: :bunch, repo: "hexpm", optional: false]}, {:bundlex, "~> 1.4", [hex: :bundlex, repo: "hexpm", optional: false]}, {:shmex, "~> 0.5.0", [hex: :shmex, repo: "hexpm", optional: false]}], "hexpm", "7a8395aabc3ba6cff04bbe5b995de7f899a38eb57f189e49927d6b8b6ccb6883"},
   "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},
   "websock_adapter": {:hex, :websock_adapter, "0.5.6", "0437fe56e093fd4ac422de33bf8fc89f7bc1416a3f2d732d8b2c8fd54792fe60", [:mix], [{:bandit, ">= 0.6.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.6", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "e04378d26b0af627817ae84c92083b7e97aca3121196679b73c73b99d0d133ea"},

examples/chat/priv/static/script.js

@@ -1,6 +1,6 @@
 const pcConfig = { 'iceServers': [{ 'urls': 'stun:stun.l.google.com:19302' },] };
 const chatInput = document.getElementById("chatInput");
-const chatMessages = document.getElementById("chatMessges");
+const chatMessages = document.getElementById("chatMessages");
 
 const proto = window.location.protocol === "https:" ? "wss:" : "ws:"
 const ws = new WebSocket(`${proto}//${window.location.host}/ws`);
@@ -20,7 +20,7 @@ const start_connection = async (ws) => {
 
   dataChannel.onmessage = event => {
     const msg = document.createElement("p");
-    p.innerText = event.data;
+    msg.innerText = event.data;
     chatMessages.appendChild(msg);
   };