87 lines
2.0 KiB
Bash
Executable File
87 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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#
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# Copyright (c) 2018 leopold@shdx.org
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# Author: Der_Leopold
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#
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# This script simply parses the text file created by readSensor and
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# prints the requested value. It is supposed to be called by the Zabbix
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# agent.
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# To prevent processing of stale data, it compares the timestamp from
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# the file to the current one and returns an error if the difference is
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# too big.
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#
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# Maximum data age in seconds. If the data is older, print an error and exit.
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MAXAGE=300
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# File to read the sensor data from
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DATAFILE=/opt/Zabbix-1wire/output
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function print_usage () {
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echo ""
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echo "Usage:"
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echo ""
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echo " parseOutput <LuftTemp|WasserTemp|BodenTemp>"
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echo ""
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}
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function parse_datafile () {
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# REGEX="^(\w+)=(\d+\.*\d*)$" # should work but does not?
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REGEX="^(\w+)=(.*)$"
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while read -r LINE; do
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if [[ $LINE =~ $REGEX ]]; then
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KEY=${BASH_REMATCH[1]}
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VALUE=${BASH_REMATCH[2]}
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case $KEY in
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"Timestamp")
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THRESHOLD=$(( $VALUE + $MAXAGE ))
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TS=$(date +"%s")
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if (( $TS <= $THRESHOLD )); then
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TSVALID=1
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fi
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;;
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"LuftTemp")
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if [ $PARAM == "LuftTemp" ]; then
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RESULT=$VALUE
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fi
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;;
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"WasserTemp")
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if [ $PARAM == "WasserTemp" ]; then
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RESULT=$VALUE
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fi
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;;
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"BodenTemp")
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if [ $PARAM == "BodenTemp" ]; then
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RESULT=$VALUE
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fi
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;;
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esac
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fi
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done < "$DATAFILE"
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}
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PARAM="$1"
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if [[ ( ! $# -eq 1 ) || ( $PARAM != "LuftTemp" && $PARAM != "WasserTemp" && $PARAM != "BodenTemp" ) ]]; then
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print_usage
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exit 1
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fi
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if [ ! -r $DATAFILE ]; then
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echo "Error: cannot read data file"
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exit 1
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else
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TSVALID=0
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parse_datafile
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fi
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if [ $TSVALID -eq 0 ]; then
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echo "Error: Data file contains old or invalid data"
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exit 1
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else
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echo "$RESULT"
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exit 0
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fi
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