charts.d/ap.chart.sh

   1 #!/bin/sh
   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
   7 declare -A ap_devs=()
   8
   9 export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
  10
  11 # _check is called once, to find out if this chart should be enabled or not
  12 ap_check() {
  13         local ev=$(iw dev | awk '
  14                 BEGIN {
  15                         i = "";
  16                         ssid = "";
  17                         ap = 0;
  18                 }
  19                 /^[ \t]+Interface / {
  20                         if( ap == 1 ) {
  21                                 print "ap_devs[" i "]=\"" ssid "\""
  22                         }
  23
  24                         i = $2;
  25                         ssid = "";
  26                         ap = 0;
  27                 }
  28                 /^[ \t]+ssid / { ssid = $2; }
  29                 /^[ \t]+type AP$/ { ap = 1; }
  30                 END {
  31                         if( ap == 1 ) {
  32                                 print "ap_devs[" i "]=\"" ssid "\""
  33                         }
  34                 }
  35         ')
  36         eval "${ev}"
  37
  38         # this should return:
  39         #  - 0 to enable the chart
  40         #  - 1 to disable the chart
  41
  42         [ ${#ap_devs[@]} -gt 0 ] && return 0
  43         return 1
  44 }
  45
  46 # _create is called once, to create the charts
  47 ap_create() {
  48         local ssid dev
  49
  50         for dev in "${!ap_devs[@]}"
  51         do
  52                 ssid="${ap_devs[${dev}]}"
  53
  54                 # create the chart with 3 dimensions
  55                 cat <<EOF
  56 CHART ap_clients.${dev} '' "Connected clients to ${ssid} on ${dev}" "clients" ${dev} ${dev} line 15000 $ap_update_every
  57 DIMENSION clients '' absolute 1 1
  58
  59 CHART ap_bandwidth.${dev} '' "Bandwidth for ${ssid} on ${dev}" "kilobits/s" ${dev} ${dev} area 15001 $ap_update_every
  60 DIMENSION received '' incremental 8 1024
  61 DIMENSION sent '' incremental -8 1024
  62
  63 CHART ap_packets.${dev} '' "Packets for ${ssid} on ${dev}" "packets/s" ${dev} ${dev} line 15002 $ap_update_every
  64 DIMENSION received '' incremental 1 1
  65 DIMENSION sent '' incremental -1 1
  66
  67 CHART ap_issues.${dev} '' "Transmit Issues for ${ssid} on ${dev}" "issues/s" ${dev} ${dev} line 15003 $ap_update_every
  68 DIMENSION retries 'tx retries' incremental 1 1
  69 DIMENSION failures 'tx failures' incremental -1 1
  70
  71 CHART ap_signal.${dev} '' "Average Signal for ${ssid} on ${dev}" "dBm" ${dev} ${dev} line 15004 $ap_update_every
  72 DIMENSION signal 'average signal' absolute 1 1
  73
  74 CHART ap_bitrate.${dev} '' "Bitrate for ${ssid} on ${dev}" "Mbps" ${dev} ${dev} line 15005 $ap_update_every
  75 DIMENSION receive '' absolute 1 1000
  76 DIMENSION transmit '' absolute -1 1000
  77 DIMENSION expected 'expected throughput' absolute 1 1000
  78 EOF
  79
  80         done
  81
  82         return 0
  83 }
  84
  85 # _update is called continiously, to collect the values
  86 ap_update() {
  87         # the first argument to this function is the microseconds since last update
  88         # pass this parameter to the BEGIN statement (see bellow).
  89
  90         # do all the work to collect / calculate the values
  91         # for each dimension
  92         # remember: KEEP IT SIMPLE AND SHORT
  93
  94         for dev in "${!ap_devs[@]}"
  95         do
  96                 iw ${dev} station dump |\
  97                         awk "
  98                                 BEGIN {
  99                                         c = 0;
 100                                         rb = 0;
 101                                         tb = 0;
 102                                         rp = 0;
 103                                         tp = 0;
 104                                         tr = 0;
 105                                         tf = 0;
 106                                         tt = 0;
 107                                         rt = 0;
 108                                         s = 0;
 109                                         g = 0;
 110                                         e = 0;
 111                                 }
 112                                 /^Station/           { c++; }
 113                                 /^[ \\t]+rx bytes:/   { rb += \$3 }
 114                                 /^[ \\t]+tx bytes:/   { tb += \$3 }
 115                                 /^[ \\t]+rx packets:/ { rp += \$3 }
 116                                 /^[ \\t]+tx packets:/ { tp += \$3 }
 117                                 /^[ \\t]+tx retries:/ { tr += \$3 }
 118                                 /^[ \\t]+tx failed:/  { tf += \$3 }
 119                                 /^[ \\t]+signal:/     { s  += \$2; }
 120                                 /^[ \\t]+rx bitrate:/ { x = \$3; rt += x * 1000; }
 121                                 /^[ \\t]+tx bitrate:/ { x = \$3; tt += x * 1000; }
 122                                 /^[ \\t]+expected throughput:(.*)Mbps/ {
 123                                         x=\$3;
 124                                         sub(/Mbps/, \"\", x);
 125                                         e += x * 1000;
 126                                 }
 127                                 END {
 128                                         print \"BEGIN ap_clients.${dev}\"
 129                                         print \"SET clients = \" c;
 130                                         print \"END\"
 131                                         print \"BEGIN ap_bandwidth.${dev}\"
 132                                         print \"SET received = \" rb;
 133                                         print \"SET sent = \" tb;
 134                                         print \"END\"
 135                                         print \"BEGIN ap_packets.${dev}\"
 136                                         print \"SET received = \" rp;
 137                                         print \"SET sent = \" tp;
 138                                         print \"END\"
 139                                         print \"BEGIN ap_issues.${dev}\"
 140                                         print \"SET retries = \" tr;
 141                                         print \"SET failures = \" tf;
 142                                         print \"END\"
 143                                         print \"BEGIN ap_signal.${dev}\"
 144                                         print \"SET signal = \" s / c;
 145                                         print \"END\"
 146
 147                                         if( c == 0 ) c = 1;
 148                                         print \"BEGIN ap_bitrate.${dev}\"
 149                                         print \"SET receive = \" rt / c;
 150                                         print \"SET transmit = \" tt / c;
 151                                         print \"SET expected = \" e / c;
 152                                         print \"END\"
 153                                 }
 154                                 "
 155         done
 156
 157         return 0
 158 }
 159