Weatherping

!weatherping.md

A simple service to check the weather every 15 minutes, and send me a nudge if it's nice out. Uses wttr.in for weather, discord webhooks for notifications, and systemd timers for scheduling.

install_services.sh

#!/usr/bin/env bash

shopt -s nullglob

for serviceFile in {*.service,*.timer,*.slice}; do
  sudo ln -s "$(pwd)/$serviceFile" "/etc/systemd/system/$serviceFile"
done

sudo systemctl daemon-reload

weatherping.service

[Unit]
Description=Ping when the weather's nice
Wants=weatherping.timer

[Service]
ExecStart=/home/<REDACTED>/scripts/weatherping.sh
WorkingDirectory=/home/<REDACTED>/scripts

[Install]
WantedBy=multi-user.target

weatherping.sh

#!/usr/bin/env bash

# https://github.com/chubin/wttr.in/blob/master/lib/constants.py
NICE_CODES=("113 116 119 122 143 248 260")
NICE_TEMP_F=40
HOOK_URL='https://discord.com/api/webhooks/<REDACTED>'

CODE_DESCRIPTIONS=(
  [113]="sunny"
  [116]="partly cloudy"
  [119]="cloudy"
  [122]="very cloudy"
  [143]="foggy"
  [248]="foggy"
  [260]="foggy"
)
# yes there are really three codes for foggy

WEATHER_DATA=$(curl wttr.in/Chicago?format=j1)

FEELS_LIKE=$(echo "$WEATHER_DATA" | jq --raw-output '.current_condition[0].FeelsLikeF')
WEATHER_CODE=$(echo "$WEATHER_DATA" | jq --raw-output '.current_condition[0].weatherCode')

if [[ "${NICE_CODES[*]}" =~ $WEATHER_CODE && (($FEELS_LIKE -ge $NICE_TEMP_F)) ]] ; then
  MSG="The weather is $FEELS_LIKE°F and ${CODE_DESCRIPTIONS[$WEATHER_CODE]} - go outside!"
  curl -X POST -H "Content-Type: application/json" -d "{\"content\": \"$MSG\"}" $HOOK_URL
  echo "Weather ping script ran; temp was $FEELS_LIKE, code was $WEATHER_CODE; ping sent"
else
  echo "Weather ping script ran; temp was $FEELS_LIKE, code was $WEATHER_CODE; ping not sent"
fi

weatherping.timer

[Unit]
Description=Run weatherping every 15 mins
Requires=weatherping.service

[Timer]
Unit=weatherping.service
# [7 AM to 8 PM), every 15 mins
# Time zone included because this is running on a VPS
OnCalendar=*-*-* 07..19:00/15 America/Chicago

[Install]
WantedBy=timers.target