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#!/bin/sh -e
init () {
[ -n "$1" ] || printArgs
mkdir -p "$(dirname $1)"
[ -f "$1" ] || cat >"$1" </dev/null
}
get () {
[ -n "$2" ] || printArgs
grep "^$2"$'\t' "$1" | cut -f3-
}
show () {
cut -f1,3- "$1"
}
filter () {
tbl="$1"
shift 1
cut -f1,2 "$tbl" \
| while read key version; do
echo -e "$key\t$(($version+$RANDOM))"
done > "$tbl".ver
cut -f1,3- "$tbl" \
| "$@" \
| join -t$'\t' "$tbl".ver - \
> "$tbl"~
mv "$tbl"~ "$tbl"
rm "$tbl".ver
}
update () {
[ -n "$2" -a -n "$3" ] || printArgs
oldversion=$(grep "^$2"$'\t' "$1" | cut -f2)
tmpfile="$1.update"
echo -e "$2\t$(($oldversion + 1 + $RANDOM))\t$3" > "$tmpfile"
merge "$1" "$tmpfile"
if [ -n "$4" ]; then
# broadcast update
gzip <"$tmpfile" >"$tmpfile.gz"
broadcaster $4 p2ptbl/$(basename "$1") - <"$tmpfile.gz"
rm "$tmpfile.gz"
fi
rm "$tmpfile"
}
merge () {
# we use sort instead of merge here to be robust in case the rows
# are not sorted
sort "$1" "$2" \
| {
oldkey=""
oldversion=0
oldval=""
while read key version val; do
if [ "$key" == "$oldkey" ]; then
if [ "$version" -gt "$oldversion" ]; then
oldversion="$version"
oldval="$val"
fi
else
[ -n "$oldkey" ] && echo -e "$oldkey\t$oldversion\t$oldval"
oldkey="$key"
oldversion="$version"
oldval="$val"
fi
done
[ -n "$oldkey" ] && echo -e "$oldkey\t$oldversion\t$oldval"
} > "$1~"
mv "$1~" "$1"
}
gossip() {
tgts="$2"
if="$3"
[ "$tgts" -gt 0 -a -n "$if" ] 2>/dev/null || printArgs
# binary search over number of sent lines until size is maximized
# and below target size
lc=$(wc -l <"$1")
[ $lc == 0 ] && return
shuf -v seed=$RANDOM <"$1" >"$1.gossip"
while [ $lc -ge 1 ]; do
head -n$lc "$1.gossip" | gzip >"$1.gossip.gz"
if [ $tgts -ge $(wc -c <"$1.gossip.gz") ]; then
broadcaster $if p2ptbl/$(basename "$1") - <"$1.gossip.gz"
rm "$1.gossip" "$1.gossip.gz"
return;
fi
lc=$(($lc / 2))
done
rm "$1.gossip" "$1.gossip.gz"
echo "$1 has rows bigger then requested packet size"
exit 1
}
printArgs () {
echo -e >&2 "Usage:
$0 init table
$0 get table key
$0 show table
$0 update table key value [interface]
$0 filter table program [args]
$0 merge table foreign-table
$0 gossip table target-size interface"
exit 1
}
checkTable () {
[ -n "$1" ] || printArgs;
[ -f "$1" ] || {
echo >&2 "$1 is no P2P table";
printArgs;
}
}
lockTable () {
checkTable "$2"
exec 666<"$2"
flock "$1" 666
}
case "$1" in
init)
init "$2"
;;
get)
lockTable -s "$2"
get "$2" "$3"
;;
show)
lockTable -s "$2"
show "$2"
;;
filter)
tbl="$2"
shift 2
lockTable -x "$tbl"
filter "$tbl" "$@"
;;
update)
lockTable -s "$2"
update "$2" "$3" "$4" "$5"
;;
merge)
lockTable -x "$2"
checkTable "$3"
merge "$2" "$3"
;;
gossip)
lockTable -s "$2"
gossip "$2" "$3" "$4"
;;
*)
printArgs
;;
esac
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