l 2: add radio.nix

1 files changed, 133 insertions, 0 deletions

diff --git a/lass/2configs/radio.nix b/lass/2configs/radio.nix
new file mode 100644
index 00000000..8cc2a2be
--- /dev/null
+++ b/lass/2configs/radio.nix
@@ -0,0 +1,133 @@
+{ config, pkgs, ... }:
+let
+  name = "radio";
+  mainUser = config.users.extraUsers.mainUser;
+  inherit (config.krebs.lib) genid;
+
+  admin-password = import <secrets/icecast-admin-pw>;
+  source-password = import <secrets/icecast-source-pw>;
+
+in {
+  users.users = {
+    "${name}" = rec {
+      inherit name;
+      group = name;
+      uid = genid name;
+      description = "radio manager";
+      home = "/home/${name}";
+      useDefaultShell = true;
+      createHome = true;
+      openssh.authorizedKeys.keys = [
+        config.krebs.users.lass.pubkey
+      ];
+    };
+  };
+
+  users.groups = {
+    "radio" = {};
+  };
+
+  krebs.per-user.${name}.packages = with pkgs; [
+    ncmpcpp
+    mpc_cli
+    tmux
+  ];
+
+  security.sudo.extraConfig = ''
+    ${mainUser.name} ALL=(${name}) NOPASSWD: ALL
+  '';
+
+  services.mpd = {
+    enable = true;
+    group = "radio";
+    musicDirectory = "/home/radio/the_playlist/music";
+    extraConfig = ''
+      audio_output {
+          type        "shout"
+          encoding    "ogg"
+          name        "my cool stream"
+          host        "localhost"
+          port        "8000"
+          mount       "/radio.ogg"
+
+      # This is the source password in icecast.xml
+          password    "${source-password}"
+
+      # Set either quality or bit rate
+      #   quality     "5.0"
+          bitrate     "128"
+
+          format      "44100:16:1"
+
+      # Optional Parameters
+          user        "source"
+      #   description "here is my long description"
+      #   genre       "jazz"
+      } # end of audio_output
+
+    '';
+  };
+
+  services.icecast = {
+    enable = true;
+    hostname =  "config.krebs.build.host.name";
+    admin.password = admin-password;
+    extraConf = ''
+      <authentication>
+        <source-password>${source-password}</source-password>
+      </authentication>
+    '';
+  };
+
+  krebs.iptables = {
+    tables = {
+      filter.INPUT.rules = [
+        { predicate = "-p tcp --dport 8000"; target = "ACCEPT"; }
+      ];
+    };
+  };
+
+  systemd.timers.radio = {
+    description = "radio autoadder timer";
+    wantedBy = [ "timers.target" ];
+
+    timerConfig = {
+      OnCalendar = "*:*";
+    };
+  };
+
+  systemd.services.radio = let
+    autoAdd = pkgs.writeDash "autoAdd" ''
+      LIMIT=$1 #in secconds
+
+      addRandom () {
+        mpc add "$(mpc ls | shuf -n1)"
+      }
+
+      timeLeft () {
+        playlistDuration=$(mpc --format '%time%' playlist | awk -F ':' 'BEGIN{t=0} {t+=$1*60+$2} END{print t}')
+        currentTime=$(mpc status | awk '/^\[playing\]/ { sub(/\/.+/,"",$3); split($3,a,/:/); print a[1]*60+a[2] }')
+        expr ''${playlistDuration:-0} - ''${currentTime:-0}
+      }
+
+      if test $(timeLeft) -le $LIMIT; then
+        addRandom
+      fi
+    '';
+  in {
+    description = "radio playlist autoadder";
+    after = [ "network.target" ];
+
+    path = with pkgs; [
+      gawk
+      mpc_cli
+    ];
+
+    restartIfChanged = true;
+
+    serviceConfig = {
+      Restart = "always";
+      ExecStart = "${autoAdd} 100";
+    };
+  };
+}