1 files changed, 117 insertions, 0 deletions
diff --git a/lib/lsg/icecast.ex b/lib/lsg/icecast.ex
new file mode 100644
index 0000000..ec168c3
--- /dev/null
+++ b/lib/lsg/icecast.ex
@@ -0,0 +1,117 @@
+defmodule LSG.Icecast do
+  use GenServer
+  require Logger
+  @interval 10_000
+  @hackney_pool :default
+  @httpoison_opts [hackney: [pool: @hackney_pool]]
+  @fuse __MODULE__
+
+  def start_link, do: GenServer.start_link(__MODULE__, [], [])
+
+  def init(_) do
+    GenServer.cast(self(), :poll)
+    {:ok, nil}
+  end
+
+  def handle_cast(:poll, state) do
+    state = poll(state)
+    {:noreply, state}
+  end
+
+  def handle_info(:poll, state) do
+    state = poll(state)
+    {:noreply, state}
+  end
+
+  defp poll(state) do
+    state = case request(base_url(), :get) do
+      {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
+        #update_json_stats(Jason.decode(body))
+        stats = update_stats(body)
+        if state != stats do
+          Logger.info "Icecast Update: " <> inspect(stats)
+          LSG.IcecastAgent.update(stats)
+          Registry.dispatch(LSG.BroadcastRegistry, "icecast", fn ws ->
+            for {pid, _} <- ws, do: send(pid, {:icecast, stats})
+          end)
+          stats
+        else
+          state
+        end
+      error ->
+        Logger.error "Icecast HTTP Error: #{inspect error}"
+        state
+    end
+    :timer.send_after(5_000, :poll)
+    state
+  end
+
+  defp update_stats(html) do
+    raw = Floki.find(html, "div.roundbox")
+    |> Enum.map(fn(html) ->
+      html = Floki.raw_html(html)
+      [{"h3", _, ["Mount Point /"<>mount]}] = Floki.find(html, "h3.mount")
+      stats = Floki.find(html, "tr")
+      |> Enum.map(fn({"tr", _, tds}) ->
+        [{"td", _, keys}, {"td", _, values}] = tds
+        key = List.first(keys)
+        value = List.first(values)
+        {key, value}
+      end)
+      |> Enum.into(Map.new)
+      {mount, stats}
+    end)
+    |> Enum.into(Map.new)
+
+    live? = if Map.get(raw["live"], "Content Type:", false), do: true, else: false
+    np = if live? do
+      raw["live"]["Currently playing:"]
+    else
+      raw["autodj"]["Currently playing:"]
+    end
+
+    genre = raw["live"]["Genre:"] || nil
+    %{np: np || "", live: live? || false, genre: genre}
+  end
+
+  defp update_json_stats({:ok, body}) do
+    Logger.debug "JSON STATS: #{inspect body}"
+  end
+
+  defp update_json_stats(error) do
+    Logger.error "Failed to decode JSON Stats: #{inspect error}"
+  end
+
+  defp request(uri, method, body \\ [], headers \\ []) do
+    headers = [{"user-agent", "LSG-API[lsg.goulag.org] href@random.sh"}] ++ headers
+    options = @httpoison_opts
+    case :ok do #:fuse.ask(@fuse, :sync) do
+      :ok -> run_request(method, uri, body, headers, options)
+      :blown -> :blown
+    end
+  end
+
+  # This is to work around hackney's behaviour of returning `{:error, :closed}` when a pool connection has been closed
+  # (keep-alive expired). We just retry the request immediatly up to five times.
+  defp run_request(method, uri, body, headers, options), do: run_request(method, uri, body, headers, options, 0)
+  defp run_request(method, uri, body, headers, options, retries) when retries < 4 do
+    case HTTPoison.request(method, uri, body, headers, options) do
+      {:error, :closed} -> run_request(method, uri, body, headers, options, retries + 1)
+      other -> other
+    end
+  end
+  defp run_request(method, uri, body, headers, options, _exceeded_retries), do: {:error, :unavailable}
+
+  #
+  # -- URIs
+  #
+
+  defp stats_json_url do
+    base_url() <> "/status-json.xsl"
+  end
+
+  defp base_url do
+    "http://91.121.59.45:8089"
+  end
+
+end