aredn/files/www/cgi-bin/signal.json

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#!/usr/bin/perl
=for commnet
Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
Copyright (C) 2015 Conrad Lara
See Contributors file for additional contributors
Copyright (c) 2013 David Rivenburg et al. BroadBand-HamNet
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 3 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Additional Terms:
Additional use restrictions exist on the AREDN(TM) trademark and logo.
See AREDNLicense.txt for more info.
Attributions to the AREDN Project must be retained in the source code.
If importing this code into a new or existing project attribution
to the AREDN project must be added to the source code.
You must not misrepresent the origin of the material conained within.
Modified versions must be modified to attribute to the original source
and be marked in reasonable ways as differentiate it from the original
version.
=cut
BEGIN {push @INC, '/www/cgi-bin'};
use perlfunc;
read_query_string();
my $debug = 0;
my $dirname="/tmp/snrlog";
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my @values;
my $counter=0;
my $sjson;
my $njson;
system("mkdir $dirname") unless (-d $dirname);
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if($parms{"realtime"}) {
# ==== REALTIME DATA =====
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time);
$d = sprintf ("%02d:%02d:%02d", $hour, $min, $sec);
if($parms{device} eq '' or $parms{device} eq 'strongest') {
($s, $n) = get_wifi_signal(get_interface("wifi"));
} else {
my ($dmac, $dname) = $parms{device} =~ /^(.*?)\-(.*)/;
($s, $n) = get_realtime_signal($dmac);
}
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$sjson= sprintf("{\"label\":\"%s\",\"y\":%s}",$d,$s);
$njson= sprintf("{\"label\":\"%s\",\"y\":%s}",$d,$n);
} else {
# ==== ARCHIVE DATA =====
# --- Load the snr data into an array
if($parms{device} eq '') { chomp ($parms{device}=`ls -1A $dirname | head -1`); }
$filename=$dirname . "/" . $parms{device};
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open my $fh, '<', $filename or die "Could not open file '$filename' $!";
chomp(my @lines = <$fh>);
close $fh;
# --- iterate over each line and build the json strings
foreach my $line (@lines) {
@values = split(',', $line);
chomp($values[0]);
chomp($values[1]);
chomp($values[2]);
#print "{\"label\":\"$values[0]\",\"y\":\"$values[1]\",\"n\":\"$values[2]\"},";
$sjson= join("", $sjson, sprintf("{\"label\":\"%s\",\"y\":%s}",$values[0],$values[1]));
$njson= join("", $njson, sprintf("{\"label\":\"%s\",\"y\":%s}",$values[0],$values[2]));
# --- properly terminate json
if(++$counter != scalar(@lines)) {
$sjson=join("", $sjson, ",");
$njson=join("", $njson, ",");
}
}
}
&json_header();
print "[[";
print $sjson;
print "],[";
print $njson;
print "]]";
sub json_header
{
# THIS MUST BE ONE LINE!
# otherwise an intermittent busybox bug will incorrectly "fix" the generated output
# print "HTTP/1.0 200 OK\r\n"; # Not needed under Uhttpd
print "Content-type: application/json\r\n";
print "Cache-Control: no-store\r\n";
print "\r\n";
}
sub get_realtime_signal()
{
my $s, $n;
my ($var) = @_;
return ("-1","-1") if not defined $var;
if (-d "/sys/kernel/debug/ieee80211/phy0/netdev:wlan0/stations/$var") {
chomp($s = `cat /sys/kernel/debug/ieee80211/phy0/netdev:wlan0/stations/$var/last_signal`);
} else {
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return ("-95","-95");
}
($junk, $n) = get_wifi_signal(get_interface("wifi"));
return ($s, $n);
}