tmux-kanagawa/scripts/network_bandwidth.sh
Adrien Kara ac95b3e069
♻️ refactor(network_bandwidth): more flexibility and less spaghetti
- Use the internationally recommended unit symbol
- Commentary for next contributor
- Remove spaghetti code
- More flexible for future evolution

Signed-off-by: Adrien Kara <adrien@iglou.eu>
2023-01-06 13:19:31 +01:00

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#!/usr/bin/env bash
# INTERVAL is equal to 1s because we want to express the bandwidth in sec
readonly INTERVAL=1
# UPLOAD and DOWNLOAD index
readonly UPLOAD=0
readonly DOWNLOAD=1
# SIZE index are the multiple of the unit byte and value the internationally recommended unit symbol in sec
readonly SIZE=(
[1]='B/s'
[1024]='kB/s'
[1048576]='MB/s'
[1073741824]='GB/s'
)
network_name=$(tmux show-option -gqv "@dracula-network-bandwidth")
# interface_bytes give interface name and signal tx/rx return Bytes
interface_bytes() {
cat "/sys/class/net/$1/statistics/$2_bytes"
}
# get_bandwidth return the number of bytes exchanged for tx and rx
get_bandwidth() {
upload="$(interface_bytes "$network_name" "tx")"
download="$(interface_bytes "$network_name" "rx")"
#wait the interval for Wait for interval to calculate the difference
sleep "$INTERVAL"
upload="$(bc <<<"$(interface_bytes "$network_name" "tx") - $upload")"
download="$(bc <<<"$(interface_bytes "$network_name" "rx") - $download")"
#set to 0 by default useful for non-existent interface
echo "${upload:-0} ${download:-0}"
}
# bandwidth_to_unit convert bytes into its highest unit and add unit symbol in sec
bandwidth_to_unit() {
local size=1
for i in "${!SIZE[@]}"; do
if (($1 < i)); then
break
fi
size="$i"
done
local result="0.00"
if (($1 != 0)); then
result="$(bc <<<"scale=2; $1 / $size")"
fi
echo "$result ${SIZE[$size]}"
}
main() {
bandwidth=()
while true; do
IFS=" " read -ra bandwidth <<<"$(get_bandwidth)"
echo "$(bandwidth_to_unit "${bandwidth[$DOWNLOAD]}") • ↑ $(bandwidth_to_unit "${bandwidth[$UPLOAD]}")"
done
}
#run main driver
main