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124 lines
4.5 KiB
Bash
124 lines
4.5 KiB
Bash
#!/usr/bin/env bash
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# Put it into /usr/lib/cups/backend/bbb-copy-raw
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# This virtual "printer" is run after BigBlueButton collects
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# all artefacts of the meeting to /var/bigbluebutton/recording/raw/$meeting_id
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# and sends all that to a special worker which processes (converts) recordings.
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# All recordings are sent, even those where recording was not turned on,
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# because it may have been not turned on erroneously and so we still have
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# to keep the recording artefact. The storage of recordings will rotate them.
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# "Printer class" in CUPS may be used to load balance processing of recordings
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# to multiple workers. Printer Device URI can be used to show which "printer"
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# (recordings processing worker) has been chosen by CUPS.
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# Authors:
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# - Mikhail Novosyolov <mikhailnov@dumalogiya.ru>, 2021
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# Based on examples at https://community.kde.org/Printing/Developer_Tools
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# Docs:
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# - backend(7) https://www.cups.org/doc/man-backend.html
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###############################################################################
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set -efu
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set -o pipefail
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# jobtitle=meeting ID (/var/bigbluebutton/recording/raw/$meeting_id),
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# we are not interested in all other variables
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readonly jobtitle=${3}
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BBB_DIR_RAW="${BBB_DIR_RAW:-/var/bigbluebutton/recording/raw}"
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# Exit codes from /usr/include/cups/backend.h
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CUPS_BACKEND_OK=0 # Job completed successfully
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CUPS_BACKEND_FAILED=1 # Job failed, use error-policy
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CUPS_BACKEND_AUTH_REQUIRED=2 # Job failed, authentication required
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CUPS_BACKEND_HOLD=3 # Job failed, hold job
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CUPS_BACKEND_STOP=4 # Job failed, stop queue
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CUPS_BACKEND_CANCEL=5 # Job failed, cancel job
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CUPS_BACKEND_RETRY=6 # Job failed, retry this job later
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CUPS_BACKEND_RETRY_CURRENT=7 # Job failed, retry this job immediately
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# We use 'set -e', script may fail somewhere,
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# make CUPS restart the job later if the error was unexpected
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_trap_exit(){
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if [ $? != "$CUPS_BACKEND_OK" ] && [ $? != "$CUPS_BACKEND_FAILED" ]; then
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exit "$CUPS_BACKEND_RETRY"
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fi
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}
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trap '_trap_exit' EXIT
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input=""
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case ${#} in
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0 )
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# This is CUPS listing backends
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# device-class scheme "Unknown" "device-info"
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echo direct bbb-copy-raw \"Unknown\" \"Collect raw recording of BigBlueButton\"
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exit
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;;
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12 )
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input=/dev/stdin
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;;
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13 )
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# do not remove {} here!
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input="${13}"
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;;
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* )
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echo CRIT: unsupported number of arguements! 1>&2
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exit "$CUPS_BACKEND_FAILED"
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;;
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esac
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if [ "$jobtitle" = "(stdin)" ]; then
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echo CRIT: printing job must be titled! 1>&2
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exit "$CUPS_BACKEND_FAILED"
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fi
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if [ -z "$jobtitle" ]; then
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echo CRIT: empty title of the printing job! 1>&2
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exit "$CUPS_BACKEND_FAILED"
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fi
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# Examples of valid URIs:
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# - local/srv/container2/raw
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# it means copy from /var/bigbluebutton/recording/raw/$meeting_id to /srv/container2/raw/$meeting_id
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DEVICE_URI="$(echo "$DEVICE_URI" | sed -e 's,^bbb-copy-raw://,,' -e 's,^bbb-copy-raw:/,,')"
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case "$DEVICE_URI" in
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local/* )
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# https://docstore.mik.ua/orelly/unix3/upt/ch10_13.htm
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# pack /var/bigbluebutton/recording/raw/$meeting_id into file.tar (root of $meeting_id = root of tarball)
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# and send to stdin of CUPS
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target_dir=/"$(echo "$DEVICE_URI" | sed -e 's,^local/,,')"
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if ! test -d "$target_dir"; then
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echo CRIT: directory "$target_dir" does not exist! 1>&2
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exit "$CUPS_BACKEND_FAILED"
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fi
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mkdir -p "$target_dir"/"$jobtitle"
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dd if="$input" | tar -C "$target_dir"/"$jobtitle" xf -
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echo > "$target_dir"/"$jobtitle"/.cups.copied_raw
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chown -R bigbluebutton:bigbluebutton "$target_dir"/"$jobtitle"
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# TODO: rebuild recordings via CUPS instead of bbb worker in ruby
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#if [ "$target_dir" = /var/bigbluebutton/recording/raw ]; then
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# bbb-record --rebuild "$jobtitle"
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#fi
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;;
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# XXX ssh probably makes no sense here, comment it for now
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# ssh can make sense if we use ionotify on directory where new recordings appear and run building task
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# but we run CUPS on every wndpoint, so ssh seems to not make any sense
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# ssh/* )
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# ssh_port="$(echo "$DEVICE_URI" | awk -F '/' '{print $2}')"
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# ssh_userhost="$(echo "$DEVICE_URI" | awk -F '/' '{print $3}')"
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# # ssh/port/user@host/remote_path/dir1/dir2 -> remote_path/dir1/dir2
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# # https://stackoverflow.com/a/49130247
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# ssh_remote_path="$(echo "$DEVICE_URI" | awk -F '/' '{for(i=4; i<=NF; ++i) printf "%s/", $i;}')"
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# # TODO: run as sudo -u <special user> ssh ...
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# ssh -p "$ssh_port" "$ssh_userhost" mkdir -p "$ssh_remote_path"/"$jobtitle"
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# dd if="$input" | ssh -p "$ssh_port" "$ssh_userhost" tar -C "$ssh_remote_path"/"$jobtitle" xf -
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# ;;
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* )
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echo CRIT: Device URI is not supported! 1>&1
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exit "$CUPS_BACKEND_FAILED"
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;;
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esac
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