94 lines
2.8 KiB
Bash
Executable File
94 lines
2.8 KiB
Bash
Executable File
#!/bin/bash
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# Parse Epson ET-2720 metrics from web interface
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#
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# Copyright (C) 2021 Mike Gerwitz
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This will produce `printer_ink_level` and `printer_pages_count` metrics.
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#
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# Note that this script is hardly robust and relies on many different
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# assumptions about the strucutre of the sloppy HTML on the page, beacuse
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# I do not permit the printer to access the Internet, and therefore the
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# firmware can never upgrade and make changes to the layout of this page.
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# Consequently, you may find that this script does not work for your
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# printer, even if it is the same model.
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cd "$(dirname "$0")"
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et-product-status()
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{
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wget -qO- "$1/PRESENTATION/ADVANCED/INFO_PRTINFO/TOP"
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}
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et-usage-status()
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{
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wget -qO- "$1/PRESENTATION/ADVANCED/INFO_MENTINFO/TOP"
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}
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# Printer serial number.
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et-serial()
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{
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local -r url="${1?Missing URL}"
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et-product-status "$url" \
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| grep -oP 'Serial Number.*?</div>' \
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| awk -F'[<>]' '{print $9}'
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}
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# Add URL and serial number to metric.
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#
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# WARNING: This does _not_ sanitize the URL; do not include double quotes.
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add-labels()
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{
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local -r url="${1?Missing URL}"
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local -r serial="${2?Missing serial number}"
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sed 's|}|, url="'"$url"'", serial="'"$serial"'", model="ET-2720"}|;
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s/{, /{/'
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}
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main()
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{
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local url="${1?Missing Epson ET-2720 URL}"
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url="${url%%/}"
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local -ri start=$( date +%s%3N )
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local -r serial=$( et-serial "$url" )
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et-product-status "$url" | awk -f ink.awk | add-labels "$url" "$serial"
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et-usage-status "$url" | awk -f usage.awk | add-labels "$url" "$serial"
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local -ri end=$( date +%s%3N )
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local -ri duration_s=$(( ( end - start ) / 1000 ))
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local -ri duration_ms=$(( ( end - start ) % 1000 ))
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echo '# HELP printer_scrape_time_seconds Timestamp of last scrape.'
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echo '# TYPE printer_scrape_time_seconds counter'
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echo "printer_scrape_time_seconds{} $(date +%s)" | add-labels "$url" "$serial"
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echo '# HELP printer_scrape_duration_seconds Number of seconds spent scraping data from web interface.'
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echo '# TYPE printer_scrape_duration_seconds gauge'
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printf 'printer_scrape_duration_seconds{} %0.3f\n' \
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"$duration_s.$duration_ms" \
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| add-labels "$url" "$serial"
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}
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main "$@"
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