charts.d/ap.chart.sh

   1 #!/bin/bash
   2
   3 # _update_every is a special variable - it holds the number of seconds
   4 # between the calls of the _update() function
   5 ap_update_every=
   6 ap_priority=6900
   7
   8 declare -A ap_devs=()
   9
  10 export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
  11
  12 # _check is called once, to find out if this chart should be enabled or not
  13 ap_check() {
  14         local ev=$(iw dev | awk '
  15                 BEGIN {
  16                         i = "";
  17                         ssid = "";
  18                         ap = 0;
  19                 }
  20                 /^[ \t]+Interface / {
  21                         if( ap == 1 ) {
  22                                 print "ap_devs[" i "]=\"" ssid "\""
  23                         }
  24
  25                         i = $2;
  26                         ssid = "";
  27                         ap = 0;
  28                 }
  29                 /^[ \t]+ssid / { ssid = $2; }
  30                 /^[ \t]+type AP$/ { ap = 1; }
  31                 END {
  32                         if( ap == 1 ) {
  33                                 print "ap_devs[" i "]=\"" ssid "\""
  34                         }
  35                 }
  36         ')
  37         eval "${ev}"
  38
  39         # this should return:
  40         #  - 0 to enable the chart
  41         #  - 1 to disable the chart
  42
  43         [ ${#ap_devs[@]} -gt 0 ] && return 0
  44         return 1
  45 }
  46
  47 # _create is called once, to create the charts
  48 ap_create() {
  49         local ssid dev
  50
  51         for dev in "${!ap_devs[@]}"
  52         do
  53                 ssid="${ap_devs[${dev}]}"
  54
  55                 # create the chart with 3 dimensions
  56                 cat <<EOF
  57 CHART ap_clients.${dev} '' "Connected clients to ${ssid} on ${dev}" "clients" ${dev} ap.clients line $((ap_priority + 1)) $ap_update_every
  58 DIMENSION clients '' absolute 1 1
  59
  60 CHART ap_bandwidth.${dev} '' "Bandwidth for ${ssid} on ${dev}" "kilobits/s" ${dev} ap.net area $((ap_priority + 2)) $ap_update_every
  61 DIMENSION received '' incremental 8 1024
  62 DIMENSION sent '' incremental -8 1024
  63
  64 CHART ap_packets.${dev} '' "Packets for ${ssid} on ${dev}" "packets/s" ${dev} ap.packets line $((ap_priority + 3)) $ap_update_every
  65 DIMENSION received '' incremental 1 1
  66 DIMENSION sent '' incremental -1 1
  67
  68 CHART ap_issues.${dev} '' "Transmit Issues for ${ssid} on ${dev}" "issues/s" ${dev} ap.issues line $((ap_priority + 4)) $ap_update_every
  69 DIMENSION retries 'tx retries' incremental 1 1
  70 DIMENSION failures 'tx failures' incremental -1 1
  71
  72 CHART ap_signal.${dev} '' "Average Signal for ${ssid} on ${dev}" "dBm" ${dev} ap.signal line $((ap_priority + 5)) $ap_update_every
  73 DIMENSION signal 'average signal' absolute 1 1
  74
  75 CHART ap_bitrate.${dev} '' "Bitrate for ${ssid} on ${dev}" "Mbps" ${dev} ap.bitrate line $((ap_priority + 6)) $ap_update_every
  76 DIMENSION receive '' absolute 1 1000
  77 DIMENSION transmit '' absolute -1 1000
  78 DIMENSION expected 'expected throughput' absolute 1 1000
  79 EOF
  80
  81         done
  82
  83         return 0
  84 }
  85
  86 # _update is called continiously, to collect the values
  87 ap_update() {
  88         # the first argument to this function is the microseconds since last update
  89         # pass this parameter to the BEGIN statement (see bellow).
  90
  91         # do all the work to collect / calculate the values
  92         # for each dimension
  93         # remember: KEEP IT SIMPLE AND SHORT
  94
  95         for dev in "${!ap_devs[@]}"
  96         do
  97                 iw ${dev} station dump |\
  98                         awk "
  99                                 BEGIN {
 100                                         c = 0;
 101                                         rb = 0;
 102                                         tb = 0;
 103                                         rp = 0;
 104                                         tp = 0;
 105                                         tr = 0;
 106                                         tf = 0;
 107                                         tt = 0;
 108                                         rt = 0;
 109                                         s = 0;
 110                                         g = 0;
 111                                         e = 0;
 112                                 }
 113                                 /^Station/           { c++; }
 114                                 /^[ \\t]+rx bytes:/   { rb += \$3 }
 115                                 /^[ \\t]+tx bytes:/   { tb += \$3 }
 116                                 /^[ \\t]+rx packets:/ { rp += \$3 }
 117                                 /^[ \\t]+tx packets:/ { tp += \$3 }
 118                                 /^[ \\t]+tx retries:/ { tr += \$3 }
 119                                 /^[ \\t]+tx failed:/  { tf += \$3 }
 120                                 /^[ \\t]+signal:/     { s  += \$2; }
 121                                 /^[ \\t]+rx bitrate:/ { x = \$3; rt += x * 1000; }
 122                                 /^[ \\t]+tx bitrate:/ { x = \$3; tt += x * 1000; }
 123                                 /^[ \\t]+expected throughput:(.*)Mbps/ {
 124                                         x=\$3;
 125                                         sub(/Mbps/, \"\", x);
 126                                         e += x * 1000;
 127                                 }
 128                                 END {
 129                                         print \"BEGIN ap_clients.${dev}\"
 130                                         print \"SET clients = \" c;
 131                                         print \"END\"
 132                                         print \"BEGIN ap_bandwidth.${dev}\"
 133                                         print \"SET received = \" rb;
 134                                         print \"SET sent = \" tb;
 135                                         print \"END\"
 136                                         print \"BEGIN ap_packets.${dev}\"
 137                                         print \"SET received = \" rp;
 138                                         print \"SET sent = \" tp;
 139                                         print \"END\"
 140                                         print \"BEGIN ap_issues.${dev}\"
 141                                         print \"SET retries = \" tr;
 142                                         print \"SET failures = \" tf;
 143                                         print \"END\"
 144                                         print \"BEGIN ap_signal.${dev}\"
 145                                         print \"SET signal = \" s / c;
 146                                         print \"END\"
 147
 148                                         if( c == 0 ) c = 1;
 149                                         print \"BEGIN ap_bitrate.${dev}\"
 150                                         print \"SET receive = \" rt / c;
 151                                         print \"SET transmit = \" tt / c;
 152                                         print \"SET expected = \" e / c;
 153                                         print \"END\"
 154                                 }
 155                                 "
 156         done
 157
 158         return 0
 159 }
 160