blob: 341cecdf092145263953079e34efa0a88ab42fac (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
#!/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"
hbbpc $4 p2ptbl/$(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
hbbpc $if p2ptbl/$(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
|
