l prism.r: add binaergewitter bot

lass/1systems/prism/config.nix

@@ -124,6 +124,7 @@ with import <stockholm/lib>;
     <stockholm/lass/2configs/container-networking.nix>
     <stockholm/lass/2configs/jitsi.nix>
     <stockholm/lass/2configs/fysiirc.nix>
+    <stockholm/lass/2configs/bgt-bot>
     {
       services.tor = {
         enable = true;

lass/2configs/bgt-bot/bgt-check.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+# needs in path:
+#   curl gnugrep jq
+# creates and manages $PWD/state
+set -xeuf
+
+send_reaktor(){
+  # usage: send_reaktor "text"
+  echo "send_reaktor: $1"
+  curl -fsS "http://localhost:$REAKTOR_PORT" \
+      -H content-type:application/json \
+      -d "$(jq -n \
+        --arg text "$1" \
+        --arg channel "$IRC_CHANNEL" \
+        '{
+          command:"PRIVMSG",
+          params:[$channel,$text]
+        }'
+      )"
+}
+
+live=$(shuf -n1 <<EOF
+Binärgewitter Liveshow hat begonnen! http://stream.radiotux.de:8000/binaergewitter.mp3
+EOF
+)
+
+offline=$(shuf -n1 <<EOF
+Live stream vorbei
+EOF
+)
+error=$(shuf -n1 <<EOF
+something went wrong
+EOF
+)
+
+if curl -Ss http://stream.radiotux.de:8000 | grep -q 'Mount Point /binaergewitter'; then
+  state='live'
+else
+  state='offline'
+fi
+prevstate=$(cat state ||:)
+
+if test "$state" == "$(cat state)";then
+  #echo "current and last state is the same ($state), doing nothing"
+  :
+else
+  echo "API state and last state differ ( '$state' != '$prevstate')"
+  if test "$state" == 'live';then
+    send_reaktor "$live"
+  elif test "$state" == 'offline';then
+    send_reaktor "$offline"
+  else
+    send_reaktor "$error"
+  fi
+  echo 'updating state'
+  printf "%s" "$state" > state
+fi

lass/2configs/bgt-bot/default.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+let
+
+  bot_port = "7654";
+  irc_channel = "#binaergewitter";
+in
+{
+  krebs.reaktor2.bgt-announce = {
+    hostname = "irc.libera.chat";
+    port = "6697";
+    nick = "bgt-announce";
+    API.listen = "inet://127.0.0.1:${bot_port}";
+    plugins = [
+      {
+        plugin = "register";
+        config = {
+          channels = [
+            irc_channel
+          ];
+        };
+      }
+    ];
+  };
+  systemd.services.check_bgt_show = {
+    startAt = "*:0/5";
+    environment = {
+      IRC_CHANNEL = irc_channel;
+      REAKTOR_PORT = bot_port;
+    };
+    path = with pkgs; [
+      curl
+      gnugrep
+      jq
+    ];
+    script = builtins.readFile ./bgt-check.sh;
+    serviceConfig = {
+      DynamicUser = true;
+      StateDirectory = "bgt-announce";
+      WorkingDirectory = "/var/lib/bgt-announce";
+      PrivateTmp = true;
+    };
+  };
+}
+