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add network bandwidth support for macOS #249

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merged 3 commits into from
Jan 30, 2024
Merged

add network bandwidth support for macOS #249

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5f47b16
add a way to detect network interface on macOS
emmagamma Jan 30, 2024
509c2c1
update interface_bytes and get_bandwidth to support macOS as well
emmagamma Jan 30, 2024
43ee6f2
replace bc usage with an awk floating point math limiting to 2 decima…
emmagamma Jan 30, 2024
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44 changes: 29 additions & 15 deletions scripts/network_bandwidth.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -26,29 +26,49 @@ interface_get() {
name="$(ip -o route get 192.168.0.0 | awk '{print $5}')"
fi
;;
Darwin)
if type route >/dev/null; then
name="$(route -n get 192.168.0.0 2>/dev/null | awk '/interface: / {print $2}')"
fi
;;
esac
fi

echo "$name"
}

# interface_bytes give interface name and signal tx/rx return Bytes
# interface_bytes give an interface name and return both tx/rx Bytes, separated by whitespace (upload first)
interface_bytes() {
cat "/sys/class/net/$1/statistics/$2_bytes"
case "$(uname -s)" in
Linux)
upload=$(cat "/sys/class/net/$1/statistics/tx_bytes")
download=$(cat "/sys/class/net/$1/statistics/rx_bytes")

echo "$upload $download"
;;
Darwin)
# column 7 is Ibytes (in bytes, rx, download) and column 10 is Obytes (out bytes, tx, upload)
netstat -nbI "$1" | tail -n1 | awk '{print $10 " " $7}'
;;
esac
}

# get_bandwidth return the number of bytes exchanged for tx and rx
get_bandwidth() {
upload="$(interface_bytes "$1" "tx")"
download="$(interface_bytes "$1" "rx")"
local upload=0
local download=0

IFS=' ' read -r upload download <<< "$(interface_bytes "$1")"

#wait the interval for Wait for interval to calculate the difference
# wait for interval to calculate the difference
sleep "$INTERVAL"

upload="$(bc <<<"$(interface_bytes "$1" "tx") - $upload")"
download="$(bc <<<"$(interface_bytes "$1" "rx") - $download")"
IFS=' ' read -r new_upload new_download <<< "$(interface_bytes "$1")"

#set to 0 by default useful for non-existent interface
upload=$(( $new_upload - $upload ))
download=$(( $new_download - $download ))

# set to 0 by default
echo "${upload:-0} ${download:-0}"
}

Expand All @@ -65,7 +85,7 @@ bandwidth_to_unit() {

local result="0.00"
if (($1 != 0)); then
result="$(bc <<<"scale=2; $1 / $size")"
result="$(awk -v a="$1" -v b="$size" 'BEGIN { printf "%.2f\n", a / b }' </dev/null)"
fi

echo "$result ${SIZE[$size]}"
Expand All @@ -83,12 +103,6 @@ main() {
interval_update=0
fi

if ! command -v bc &> /dev/null
then
echo "command bc could not be found!"
exit 1
fi

while true; do
if ((counter == 0)); then
counter=60
Expand Down