p2ptbl: add filter

Usage:
p2ptbl filter table program [args]

will call program with the arguments args and the result of p2ptbl
show table on standart input. stdout of program will be used as new
table. The filter program may remove lines or edit anything but the
key (first row).

1 files changed, 22 insertions, 0 deletions

diff --git a/files/common/sbin/p2ptbl b/files/common/sbin/p2ptbl
index 2048e37..0a5bae3 100755
--- a/files/common/sbin/p2ptbl
+++ b/files/common/sbin/p2ptbl
@@ -17,6 +17,21 @@ 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)
@@ -86,6 +101,7 @@ $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
@@ -117,6 +133,12 @@ case "$1" in
 	lockTable -s "$2"
 	show "$2"
 	;;
+    filter)
+	tbl="$2"
+	shift 2
+	lockTable -x "$tbl"
+	filter "$tbl" "$@"
+	;;
     update)
 	lockTable -s "$2"
 	update "$2" "$3" "$4" "$5"