Simple shell script for sending Valheim server alerts to Discord

monitor-vhserver.sh

#/bin/bash

# your webhook here
webhookURL="https://discord.com/api/webhooks/123412341234/ldsakjflsadsdkjfdslfkjdslfkj"

main() {
	poll_log
	echo "$newLog" > /tmp/currentLog
	rm -f /tmp/newLog

	while true; do
		poll_log

		if [ "$newHash" = "$currentHash" ]; then
			# chill
			:
		else
			# differnet hash means there was an update in the log
			# wat is the update?

			logUpdate=$(grep -F -x -v -f /tmp/currentLog /tmp/newLog)

			# process the log update
			echo "$logUpdate" | grep -P 'Got connection SteamID \d+' > /dev/null 2>/dev/null
			if [ "$?" = "0" ]; then
				message=$(echo "$logUpdate" | grep -P 'Got connection SteamID \d+' | tr -d '\r')
				echo "$message"
				sendToDiscord "$message"
			fi

			echo "$logUpdate" | grep -P 'Peer \d+ has wrong password' > /dev/null 2>/dev/null
			if [ "$?" = "0" ]; then
				message=$(echo "$logUpdate" | grep -P 'Peer \d+ has wrong password' | tr -d '\r')
				echo "$message"
				sendToDiscord "$message"
			fi

			echo "$logUpdate" | grep -P 'Got character ZDOID from [^ ]+ :' > /dev/null 2>/dev/null
			if [ "$?" = "0" ]; then
				message=$(echo "$logUpdate" | grep -P 'Got character ZDOID from [^ ]+ :' | tr -d '\r')
				echo "$message"
				sendToDiscord "$message"
			fi

			echo "$logUpdate" | grep -P 'Closing socket \d+' > /dev/null 2>/dev/null
			if [ "$?" = "0" ]; then
				message=$(echo "$logUpdate" | grep -P 'Closing socket \d+' | tr -d '\r')
				echo "$message"
				sendToDiscord "$message"
			fi

			echo "$logUpdate" | grep -P 'World saved' > /dev/null 2>/dev/null
			if [ "$?" = "0" ]; then
				message=$(echo "$logUpdate" | grep -P 'World saved' | tr -d '\r')
				echo "$message"
				sendToDiscord "$message"
			fi

			# update current log
			echo "$newLog" > /tmp/currentLog
			
			# to not enter an infinite loop, the "new" hash is now the current hash
			currentHash="$newHash"
		fi

		# =====

		sleep 2 # throttle 2 second poll
	done
}

poll_log() {
	# get a current snapshot of latest log, plus the hash
	newLog=$(cat log/console/vhserver-console.log | grep -P '^\d{2}/\d{2}/\d{4}' | tail -n 40)
	echo "$newLog" > /tmp/newLog	
	newHash=$(cat /tmp/newLog | sha1sum | cut -c -40)
}

sendToDiscord() {
	# $1 will be a simple string sent to discord

	# assemble -d line
	data="{\"username\": \"Valheim Server Alert\", \"content\": \""$1"\"}"

	curl -X POST \
	-H "Content-Type: application/json" \
	-d "$data" \
	"$webhookURL"
}

main

The world save updates can get pretty annoying as they happen every 20 mins. Comment out line 56 to quiet those.

Hey I don't see your comment anymore on the gist, but check your Valheim server logs. I haven't worked on this (or run my Valheim server) in a while and they may have updated the phrasing of those messages, causing the regexes to fail to match.

…

On Wed, Apr 26, 2023 at 3:39 PM Sarang Rajesh ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Hey, I'm only getting alerts for Got character ZDOID. — Reply to this email directly, view it on GitHub <https://gist.github.com/austinjdean/6581e351f8bf6914af9dccf950424aa3#gistcomment-4549653> or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABX5ORK6E2N3PPZD776TZULXDF2YBBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVEYTAOBWGI3DINRRU52HE2LHM5SXFJTDOJSWC5DF> . You are receiving this email because you authored the thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .