talon systemd user service and associated watchdog

gistfile1.txt

❯ cat /home/aa/.config/systemd/user/talon.service
  File: /home/aa/.config/systemd/user/talon.service
  [Install]
  WantedBy=graphical-session.target
  
  [Service]
  ExecStart=/nix/store/3j9rf4s7ldqq79xa92x73yqlp9885zzd-talon/bin/talon
  Restart=always
  
  [Unit]
  After=graphical-session-pre.target
  Description=Talon Voice
  Documentation=https://talonvoice.com/
  PartOf=graphical-session.target
❯ cat /home/aa/.config/systemd/user/talon-watchdog.service
  File: /home/aa/.config/systemd/user/talon-watchdog.service
  [Install]
  WantedBy=graphical-session.target
  
  [Service]
  ExecStart=/nix/store/8cjr85lgl69bwrvi2nlhf841g39mkvsl-talon-watchdog/bin/talon-watchdog
  Restart=on-failure
  
  [Unit]
  After=talon.target
  Description=Talon Voice Watchdog
  Documentation=https://talonvoice.com/
  PartOf=graphical-session.target
❯ cat /nix/store/8cjr85lgl69bwrvi2nlhf841g39mkvsl-talon-watchdog/bin/talon-watchdog
  File: /nix/store/8cjr85lgl69bwrvi2nlhf841g39mkvsl-talon-watchdog/bin/talon-watchdog
  #!/nix/store/5jw69mbaj5dg4l2bj58acg3gxywfszpj-bash-5.2p26/bin/bash
  set -o errexit
  set -o nounset
  set -o pipefail
  
  export PATH="/nix/store/lizkknvmwjda1g2lshys5av0kbxir97g-inotify-tools-4.23.9.0/bin:/nix/store/ysqx2xfzygv2rxl7nxnw48276z5ckppn-coreutils-9.5/bin:/nix/store/x3dw5h8zds2m4qb2c332h4sxp0qllq
  ld-talon-notify/bin:$PATH"
  
  #!/usr/bin/env bash
  set -euo pipefail
  
  LOG_FILE=$HOME/.talon/talon.log
  NOTIFY_THRESHOLD=10
  RESTART_THRESHOLD=60
  
  notified=false
  while true; do
      inotifywait -e modify "${LOG_FILE}" >/dev/null 2>&1
  
      tail -n 10 "${LOG_FILE}" | while read -r line; do
          if [[ ${line} == *"(stalled)"* ]]; then
              count=$(echo "${line}" | cut -d@ -f2 | cut -ds -f1 | cut -d. -f1)
              # Keep the count high in case we are running certain scripts
              if [[ ${count} -ge $RESTART_THRESHOLD ]]; then
                  talon-notify "Talon auto-restarting"
                  systemctl --user restart talon
                  sleep 5
                  notified=false
              elif [[ ${count} -ge $NOTIFY_THRESHOLD ]] && [[ $notified == false ]]; then
                  talon-notify "Talon stalled. Will auto-restart after ${RESTART_THRESHOLD}s"
                  # FIXME: We should use a notification that allows you to collect yes or no to restart
                  # gnome-shell doesn't support expiry time, so we can rely on an action for now, unless we used
                  # something like dunst
                  sleep 5
                  notified=true
              fi
          fi
      done
  
      # This $? comes from exit in the read line while loop above
      if [[ $? == 1 ]]; then
          exit 1
      fi
  done
  ❯ cat /nix/store/x3dw5h8zds2m4qb2c332h4sxp0qllqld-talon-notify/bin/talon-notify
  File: /nix/store/x3dw5h8zds2m4qb2c332h4sxp0qllqld-talon-notify/bin/talon-notify
  #!/nix/store/5jw69mbaj5dg4l2bj58acg3gxywfszpj-bash-5.2p26/bin/bash
  set -o errexit
  set -o nounset
  set -o pipefail
  
  export PATH="/nix/store/fzfzz1m1s66hnmccnn02q3bq5g2na9d7-libnotify-0.8.3/bin:$PATH"
  
  #shellcheck disable=SC2086,SC2068
  /nix/store/fzfzz1m1s66hnmccnn02q3bq5g2na9d7-libnotify-0.8.3/bin/notify-send -i /nix/store/7jj38alx7l62ig1vrqrbzacfl4ppqyzp-talon-48x48.png "$@"