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alfred: add random node-specific delay before sending

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Jan-Philipp Litza 2014-01-16 22:36:09 +01:00
parent 50782f759e
commit cc2ef851c7
1 changed files with 8 additions and 0 deletions
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8
package/gluon-alfred/files/lib/gluon/alfred/announce.sh
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@ -15,9 +15,17 @@ fi
# set defaults
[ -z "$ALFRED_DATA_TYPE" ] && ALFRED_DATA_TYPE=158
[ -z "$NET_IF" ] && NET_IF=br-client
[ -z "$MAX_WAIT" ] && MAX_WAIT=300
set -e
# To avoid mass flooding the network every five minutes with all clients
# simultaneously, wait for a random time between 0 and 300 seconds, but fixed
# for each device to maintain 5 minutes between updates.
# Calculated using first 3 hex digits of the primary MAC address' MD5 hash
DELAY=$((0x$(sysconfig primary_mac | tr -d ':' | md5sum | head -c3) * $MAX_WAIT / (16**3)))
sleep $DELAY
json_init
json_add_string "hostname" "$(uci get 'system.@system[0].hostname')"