loop.pl

   1 #!/usr/bin/perl
   2 use strict;
   3
   4 use v5.10.1;
   5
   6 use Mojolicious::Lite;
   7 use Serial;
   8 use Mojo::IOLoop;
   9 use Mojo::IOLoop::Stream;
  10 use Mojo::Transaction::WebSocket;
  11 #use Mojo::JSON  qw(decode_json encode_json);
  12 use JSON;
  13 use Debug;
  14 use SMGLog;
  15 use Math::Round qw(nearest);
  16 use File::Copy;
  17 use Data::Random qw(rand_chars);
  18 use IO::File;
  19
  20 use constant pi => 3.14159265358979;
  21
  22 my $randomfn = '/dev/urandom';
  23 my $devname = "/dev/davis";
  24 my $datafn = ".loop_data";
  25 my $dataf;
  26
  27 my $poll_interval = 2.5;
  28 my $rain_mult = 0.2;                            # 0.1 or 0.2 mm or 0.01 inches
  29 my $tid;
  30 my $rid;
  31 our $did;
  32 my $nlcount;
  33 my $state = "ready";
  34 my $buf;
  35 my $dbg;
  36 my $ser;                                                        # the serial port Mojo::IOLoop::Stream
  37 my $last_min_h;
  38 my $last_hour_h;
  39
  40 our $json = JSON->new->canonical(1);
  41 our $WS = {};                                   # websocket connections
  42
  43 our $ld = {};
  44 our @last10minsr = ();
  45 our @last5daysh = ();
  46 our $windmins = 2;                              # no of minutes of wind data for the windrose
  47 our $histdays = 5;                              # no of days of (half)hour data to search for main graph
  48 our $updatepermin = 60 / 2.5;   # no of updates per minute
  49
  50 our $loop_count;                                # how many LOOPs we have done, used as start indicator
  51
  52 our     @crc_table = (
  53                                   0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  54                                   0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  55                                   0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  56                                   0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  57                                   0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  58                                   0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  59                                   0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  60                                   0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  61                                   0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
  62                                   0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  63                                   0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
  64                                   0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  65                                   0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
  66                                   0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  67                                   0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
  68                                   0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  69                                   0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  70                                   0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  71                                   0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  72                                   0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  73                                   0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  74                                   0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
  75                                   0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  76                                   0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  77                                   0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  78                                   0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
  79                                   0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  80                                   0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
  81                                   0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  82                                   0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
  83                                   0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  84                                   0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0
  85                                  );
  86
  87 our %bar_trend;
  88
  89 $bar_trend{-60} = "Falling Rapidly";
  90 $bar_trend{196} = "Falling Rapidly";
  91 $bar_trend{-20} = "Falling Slowly";
  92 $bar_trend{236} = "Falling Slowly";
  93 $bar_trend{0} = "Steady";
  94 $bar_trend{20} = "Rising Slowly";
  95 $bar_trend{60} = "Rising Rapidly";
  96
  97 our $ending = 0;
  98
  99 $SIG{TERM} = $SIG{INT} = sub {++$ending; Mojo::IOLoop->stop;};
 100 $SIG{HUP} = 'IGNORE';
 101
 102
 103 # WebSocket weather service
 104 websocket '/weather' => sub {
 105   my $c = shift;
 106   my $msg = shift;
 107   my $tx = $c->tx;
 108
 109   # Opened
 110   app->log->debug('WebSocket opened.');
 111   dbg 'WebSocket opened' if isdbg 'chan';
 112   $WS->{$tx} = $tx;
 113
 114   # send historical data
 115   $c->send($ld->{lasthour_h}) if exists $ld->{lasthour_h};
 116   $c->send($ld->{lastmin_h}) if exists $ld->{lastmin_h};
 117
 118   # disable timeout
 119   $c->inactivity_timeout(3615);
 120
 121   # Incoming message
 122   $c->on(
 123                  message => sub {
 124                          my ($c, $msg) = @_;
 125                          dbg "websocket: text $msg" if isdbg 'chan';
 126                  },
 127                  json => sub {
 128                          my ($c, $msg) = @_;
 129                          dbg "websocket: json $msg" if isdbg 'chan';
 130                  }
 131   );
 132
 133   # Closed
 134   $c->on(finish => sub {
 135     my ($c, $code, $reason) = @_;
 136     app->log->debug("WebSocket closed with status $code.");
 137         dbg "websocket closed with status $code" if isdbg 'chan';
 138         delete $WS->{$tx};
 139   });
 140 };
 141
 142 get '/' => {template => 'index'};
 143
 144
 145 dbginit();
 146 if (@ARGV) {
 147         dbgadd(@ARGV);
 148 }
 149 dbgadd('chan');
 150
 151 dbg '***';
 152 dbg "*** starting $0";
 153 dbg '***';
 154
 155 read_ld();
 156
 157 my $tnow = time;
 158 my $dayno = int ($tnow/86400);
 159 for (my $i = 0-$histdays; $i < 0; ++$i ) {
 160         push @last5daysh, grab_history(SMGLog->new("day"), "h", $tnow-(86400*$histdays), $dayno+$i+1);
 161 }
 162 @last10minsr = map {my ($t, $js) = split(/\s/, $_, 2); $js} grab_history(SMGLog->new("debug"), "r", $tnow-(60*$windmins), $dayno);
 163 dbg sprintf("last5days = %d last10mins = %d", scalar @last5daysh, scalar @last10minsr);
 164
 165 sysopen(R, $randomfn, 0) or die "cannot open $randomfn $!\n";
 166 my $rs;
 167 sysread(R, $rs, 32) or die "not enough randomness available\n";
 168 close R;
 169
 170 app->secrets([qw(Here's something that's really seakrett), $rs]);
 171
 172 our $dlog = SMGLog->new("day");
 173 dbg "before next tick";
 174 Mojo::IOLoop->next_tick(sub { loop() });
 175 dbg "before app start";
 176 app->start;
 177 dbg "after app start";
 178
 179 write_ld();
 180 $dataf->close if $dataf;
 181 undef $dataf;
 182
 183
 184 # move all the files along one
 185 cycle_loop_data_files();
 186
 187 dbg '***';
 188 dbg "*** ending $0";
 189 dbg '***';
 190
 191 exit 0;
 192
 193 ##################################################################################
 194
 195 sub loop
 196 {
 197         dbg "last_min: " . scalar gmtime($ld->{last_min});
 198         dbg "last_hour: " . scalar gmtime($ld->{last_hour});
 199
 200         $did = Mojo::IOLoop->recurring(1 => sub {$dlog->flushall});
 201
 202         do_reopen($devname);
 203 }
 204
 205
 206
 207 sub on_read
 208 {
 209         my ($ser, $d) = @_;
 210         $buf .= $d;
 211         $d =~ s/([\%\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
 212         dbg "read added '$d' buf lth=" . length $buf if isdbg 'raw';
 213         if ($state eq 'waitnl' && $buf =~ /[\cJ\cM]+/) {
 214                 dbg "Got \\n" if isdbg 'state';
 215                 Mojo::IOLoop->remove($tid) if $tid;
 216                 undef $tid;
 217                 undef $buf;
 218                 $nlcount = 0;
 219                 $ser->write("LPS 1 1\n");
 220                 chgstate("waitloop");
 221         } elsif ($state eq "waitloop") {
 222                 if ($buf =~ /\x06/) {
 223                         dbg "Got ACK 0x06" if isdbg 'state';
 224                         chgstate('waitlooprec');
 225                         undef $buf;
 226                 }
 227         } elsif ($state eq 'waitlooprec') {
 228                 if (length $buf >= 99) {
 229                         dbg "got loop record" if isdbg 'chan';
 230                         chgstate('');
 231                         process($buf);
 232                         undef $buf;
 233                 }
 234         }
 235 }
 236
 237 sub start_loop
 238 {
 239         $nlcount = 1;
 240         dbg "start_loop writing $nlcount \\n" if isdbg 'state';
 241         $ser->write("\n");
 242         Mojo::IOLoop->remove($tid) if $tid;
 243         undef $tid;
 244         $tid = Mojo::IOLoop->recurring(0.6 => sub {
 245                                                                            if (++$nlcount > 10) {
 246                                                                                    dbg "\\n count > 10, closing connection" if isdbg 'chan';
 247                                                                                    do_reopen($devname);
 248                                                                                    return;
 249                                                                            }
 250                                                                            dbg "writing $nlcount \\n" if isdbg 'state';
 251                                                                            $ser->write("\n");
 252                                                                    });
 253         chgstate("waitnl");
 254 }
 255
 256 sub chgstate
 257 {
 258         dbg "state '$state' -> '$_[0]'" if isdbg 'state';
 259         $state = $_[0];
 260 }
 261
 262 sub do_reopen
 263 {
 264         my $name = shift;
 265         dbg "do reopen on '$name' ending $ending";
 266         unless ($ending) {
 267                 $ser = do_open($name);
 268                 start_loop();
 269                 chgstate('');
 270                 $nlcount = 0;
 271                 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
 272         }
 273 }
 274
 275 sub do_open
 276 {
 277         my $name = shift;
 278
 279         $ser->close if $ser;
 280         undef $ser;
 281
 282         my $ob = Serial->new($name, 19200) || die "$name $!\n";
 283         dbg "streaming $name fileno(" . fileno($ob) . ")" if isdbg 'chan';
 284
 285         my $ser = Mojo::IOLoop::Stream->new($ob);
 286         $ser->on(error=>sub {dbg "serial $_[1]"; do_reopen($name) unless $ending});
 287         $ser->on(close=>sub {dbg "serial closing"; do_reopen($name) unless $ending});
 288         $ser->on(timeout=>sub {dbg "serial timeout";});
 289         $ser->on(read=>sub {on_read(@_)});
 290         $ser->start;
 291
 292         Mojo::IOLoop->remove($tid) if $tid;
 293         undef $tid;
 294         Mojo::IOLoop->remove($rid) if $rid;
 295         undef $rid;
 296         $rid = Mojo::IOLoop->recurring($poll_interval => sub {
 297                                                                            start_loop() if !$state;
 298                                                                    });
 299         chgstate('');
 300         $nlcount = 0;
 301
 302         return $ser;
 303 }
 304
 305 my @min;
 306 my @hour;
 307
 308 sub process
 309 {
 310         my $blk = shift;
 311         my $loo =  substr $blk,0,3;
 312         unless ( $loo eq 'LOO') {
 313                 dbg "Block invalid loo -> $loo" if isdbg 'chan'; return;
 314         }
 315
 316         my $tmp;
 317         my $temp;
 318         my $rain;
 319         my %h;
 320
 321         my $crc_calc = CRC_CCITT($blk);
 322
 323         if ($crc_calc==0) {
 324
 325                 # Common ones
 326                 $tmp = unpack("s", substr $blk,7,2) / 1000;
 327                 $h{Pressure} = nearest(1, in2mb($tmp));
 328
 329                 $tmp = unpack("s", substr $blk,9,2) / 10;
 330                 $h{Temp_In} = nearest(0.1, f2c($tmp));
 331
 332                 $temp  = nearest(0.1, f2c(unpack("s", substr $blk,12,2) / 10));
 333                 $h{Temp_Out}  = $temp;
 334                 if ($temp > 75 || $temp < -75) {
 335                         dbg "LOOP Temperature out of range ($temp), record ignored";
 336                         return;
 337                 }
 338
 339                 $tmp = unpack("C", substr $blk,14,1);
 340                 $h{Wind} = nearest(0.1, mph2mps($tmp));
 341                 $h{Dir}     = unpack("s", substr $blk,16,2)+0;
 342
 343                 my $wind = {w => $h{Wind}, d => $h{Dir}};
 344                 $wind = 0 if $wind == 255;
 345                 push @{$ld->{wind_min}}, $wind;
 346
 347                 $tmp = int(unpack("C", substr $blk,33,1)+0);
 348                 if ($tmp > 100) {
 349                         dbg "LOOP Outside Humidity out of range ($tmp), record ignored";
 350                         return;
 351                 }
 352                 $h{Humidity_Out} = $tmp;
 353                 $tmp = int(unpack("C", substr $blk,11,1)+0);
 354                 if ($tmp > 100) {
 355                         dbg "LOOP Inside Humidity out of range ($tmp), record ignored";
 356                         return;
 357                 }
 358                 $h{Humidity_In}  = $tmp;
 359
 360
 361                 $tmp = unpack("C", substr $blk,43,1)+0;
 362                 $h{UV} = $tmp unless $tmp >= 255;
 363                 $tmp = unpack("s", substr $blk,44,2)+0; # watt/m**2
 364                 $h{Solar} = $tmp unless $tmp >= 32767;
 365
 366                 #       $h{Rain_Rate}  = nearest(0.1,unpack("s", substr $blk,41,2) * $rain_mult);
 367                 $rain = $h{Rain_Day}   = nearest(0.1, unpack("s", substr $blk,50,2) * $rain_mult);
 368                 my $delta_rain = $h{Rain} = nearest(0.1, ($rain >= $ld->{last_rain} ? $rain - $ld->{last_rain} : $rain)) if $loop_count;
 369                 $ld->{last_rain} = $rain;
 370
 371                 # what sort of packet is it?
 372                 my $sort =  unpack("C", substr $blk,4,1);
 373                 if ($sort) {
 374
 375                         # Newer LOOP2 packet
 376                         $tmp = unpack("C", substr $blk,18,2);
 377                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp/10));
 378                         $tmp = unpack("C", substr $blk,20,2);
 379                         #               $h{Wind_Avg_2} = nearest(0.1,mph2mps($tmp/10));
 380                         $tmp = unpack("C", substr $blk,22,2);
 381                         #               $h{Wind_Gust_10} = nearest(0.1,mph2mps($tmp/10));
 382
 383                         #               $h{Dir_Avg_10} = unpack("C", substr $blk,24,2)+0;
 384                         $tmp = unpack("C", substr $blk,30,2);
 385                         $h{Dew_Point} = nearest(0.1, f2c($tmp));
 386
 387                 } else {
 388
 389                         # Older LOOP packet
 390                         $tmp = unpack("C", substr $blk,15,1);
 391                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp));
 392                         $h{Dew_Point}  = nearest(0.1, dew_point($h{Temp_Out}, $h{Humidity_Out}));
 393                         $h{Rain_Month}  = nearest(0.1, unpack("s", substr $blk,52,2) * $rain_mult);
 394                         $h{Rain_Year}  = nearest(0.1, unpack("s", substr $blk,54,2) * $rain_mult);
 395                 }
 396
 397                 my $ts = time;
 398                 my $s;
 399                 my $dayno = int($ts/86400);
 400                 if ($dayno > $ld->{last_day}) {
 401                         $ld->{Temp_Out_Max} = $ld->{Temp_Out_Min} = $temp;
 402                         $ld->{Temp_Out_Max_T} = $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 403                         $ld->{last_day} = $dayno;
 404                         write_ld();
 405                         cycle_loop_data_files();
 406                 }
 407                 if ($temp > $ld->{Temp_Out_Max}) {
 408                         $ld->{Temp_Out_Max} = $temp;
 409                         $ld->{Temp_Out_Max_T} = clocktime($ts, 0);
 410                         write_ld();
 411                 }
 412                 if ($temp < $ld->{Temp_Out_Min}) {
 413                         $ld->{Temp_Out_Min} = $temp;
 414                         $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 415                         write_ld();
 416                 }
 417
 418                 if ($ts >= $ld->{last_hour} + 1800) {
 419                         $h{Pressure_Trend}    = unpack("C", substr $blk,3,1);
 420                         $h{Pressure_Trend_txt} = $bar_trend{$h{Pressure_Trend}};
 421                         $h{Batt_TX_OK}  = (unpack("C", substr $blk,86,1)+0) ^ 1;
 422                         $h{Batt_Console}  = nearest(0.01, unpack("s", substr $blk,87,2) * 0.005859375);
 423                         $h{Forecast_Icon}  = unpack("C", substr $blk,89,1);
 424                         $h{Forecast_Rule}  = unpack("C", substr $blk,90,1);
 425                         $h{Sunrise}  = sprintf( "%04d", unpack("S", substr $blk,91,2) );
 426                         $h{Sunrise}  =~ s/(\d{2})(\d{2})/$1:$2/;
 427                         $h{Sunset}   = sprintf( "%04d", unpack("S", substr $blk,93,2) );
 428                         $h{Sunset}  =~ s/(\d{2})(\d{2})/$1:$2/;
 429                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 430                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 431                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 432                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 433
 434
 435                         if ($loop_count) {      # i.e not the first
 436                                 my $a = wind_average(scalar @{$ld->{wind_hour}} ? @{$ld->{wind_hour}} : {w => $h{Wind}, d => $h{Dir}});
 437
 438                                 $h{Wind_1h} = nearest(0.1, $a->{w});
 439                                 $h{Dir_1h} = nearest(0.1, $a->{d});
 440
 441                                 $a = wind_average(@{$ld->{wind_min}});
 442                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 443                                 $h{Dir_1m} = nearest(1, $a->{d});
 444
 445                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 446                         }
 447                         $ld->{last_rain_min} = $ld->{last_rain_hour} = $rain;
 448
 449                         $last_hour_h = {%h};
 450                         $s = genstr($ts, 'h', \%h);
 451                         $ld->{lasthour_h} = $s;
 452
 453                         $ld->{last_hour} = int($ts/1800)*1800;
 454                         $ld->{last_min} = int($ts/60)*60;
 455                         @{$ld->{wind_hour}} = ();
 456                         @{$ld->{wind_min}} = ();
 457
 458                         if ($s) {
 459                                 output_str($s, 1);
 460                                 push @last5daysh, $s;
 461                                 shift @last5daysh if @last5daysh > 5*24;
 462                         }
 463                         write_ld();
 464
 465                 } elsif ($ts >= $ld->{last_min} + 60) {
 466                         my $a = wind_average(@{$ld->{wind_min}});
 467                         my %save;
 468
 469                         push @{$ld->{wind_hour}}, $a;
 470
 471                         if ($loop_count) {      # i.e not the first
 472                                 my $rm;
 473
 474                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 475                                 $h{Dir_1m} = nearest(1, $a->{d});
 476                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 477                         }
 478                         $ld->{last_rain_min} = $rain;
 479
 480                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 481                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 482                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 483                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 484
 485                         $last_min_h = {%h};
 486                         $s = genstr($ts, 'm', \%h);
 487                         $ld->{lastmin_h} = $s;
 488
 489                         $ld->{last_min} = int($ts/60)*60;
 490                         @{$ld->{wind_min}} = ();
 491
 492                         output_str($s, 1) if $s;
 493                         write_ld();
 494
 495                 } else {
 496                         my $o = gen_hash_diff($ld->{last_h}, \%h);
 497                         if ($o) {
 498                                 $o->{Dir} ||= $h{Dir};
 499                                 $o->{Wind} ||= $h{Wind};
 500                                 $o->{Dir} += 0;
 501                                 $o->{Wind} += 0;
 502                                 $s = genstr($ts, 'r', $o);
 503                                 push @last10minsr, $s;
 504                                 shift @last10minsr while @last10minsr > ($windmins * $updatepermin);
 505                         }
 506                         else {
 507                                 dbg "loop rec not changed" if isdbg 'chan';
 508                         }
 509                         output_str($s, 0) if $s;
 510                 }
 511                 $ld->{last_h} = \%h;
 512                 ++$loop_count;
 513         } else {
 514                 dbg "CRC check failed for LOOP data!";
 515         }
 516         return;
 517 }
 518
 519 sub genstr
 520 {
 521         my $ts = shift;
 522         my $let = shift;
 523         my $h = shift;
 524
 525         my $j =  $json->encode($h);
 526         my $tm = clocktime($ts, 1);
 527         return qq|{"tm":"$tm","t":$ts,"$let":$j}|;
 528 }
 529
 530 sub clocktime
 531 {
 532         my $ts = shift;
 533         my $secsreq = shift;
 534         my ($sec,$min,$hr) = (gmtime $ts)[0,1,2];
 535         my $s;
 536         if ($secsreq) {
 537                 $s = sprintf "%02d:%02d:%02d", $hr, $min, $sec;
 538         } else {
 539                 $s = sprintf "%02d:%02d", $hr, $min;
 540         }
 541         return $s;
 542 }
 543
 544 sub output_str
 545 {
 546         my $s = shift;
 547         my $logit = shift;
 548
 549         dbg $s;
 550 #       say $s;
 551         $dlog->writenow($s) if $logit;
 552         foreach my $ws (keys $WS) {
 553                 my $tx = $WS->{$ws};
 554                 if ($tx) {
 555                         $tx->send($s);
 556                 } else {
 557                         delete $WS->{$tx};
 558                 }
 559         }
 560 }
 561
 562 sub gen_hash_diff
 563 {
 564         my $last = shift;
 565         my $now = shift;
 566         my %o;
 567         my $count;
 568
 569         while (my ($k, $v) = each %$now) {
 570                 if (!exists $last->{$k} || $last->{$k} ne $now->{$k}) {
 571                         $o{$k} = $v;
 572                         ++$count;
 573                 }
 574         }
 575         return $count ? \%o : undef;
 576 }
 577
 578 sub dew_point
 579 {
 580         my $temp = shift @_;
 581         my $rh   = shift @_;
 582
 583         #  Using the simplified approximation for dew point
 584         #  Accurate to 1 degree C for humidities > 50 %
 585         #  http://en.wikipedia.org/wiki/Dew_point
 586
 587         my $dewpoint = $temp - ((100 - $rh) / 5);
 588
 589         # this is the more complete one (which doesn't work)
 590         #my $a = 6.1121;
 591         #my $b = 18.678;
 592         #my $c = 257.14;
 593         #my $ytrh = log(($rh/100) + ($b * $temp) / ($c + $temp));
 594         #my $dewpoint = ($c * $ytrh) / ($b - $ytrh);
 595
 596         return $dewpoint;
 597 }
 598
 599 sub CRC_CCITT
 600 {
 601     # Expects packed data...
 602     my $data_str = shift @_;
 603
 604         my $crc = 0;
 605         my @lst = split //, $data_str;
 606         foreach my $data (@lst) {
 607                 my $data = unpack("c",$data);
 608
 609                 my $crc_prev = $crc;
 610                 my $index = $crc >> 8 ^ $data;
 611                 my $lhs = $crc_table[$index];
 612                 #print "lhs=$lhs, crc=$crc\n";
 613                 my $rhs = ($crc << 8) & 0xFFFF;
 614                 $crc = $lhs ^ $rhs;
 615
 616
 617         }
 618
 619         return $crc;
 620 }
 621
 622 sub f2c
 623 {
 624         return ($_[0] - 32) * 5/9;
 625 }
 626
 627 sub mph2mps
 628 {
 629         return $_[0] * 0.44704;
 630 }
 631
 632 sub in2mb
 633 {
 634         return $_[0] * 33.8637526;
 635 }
 636
 637 sub wind_average
 638 {
 639         my ($sindir, $cosdir, $wind);
 640         my $count;
 641
 642         foreach my $r (@_) {
 643                 $wind += $r->{w};
 644                 $sindir += sin(d2r($r->{d})) * $r->{w};
 645                 $cosdir += cos(d2r($r->{d})) * $r->{w};
 646                 ++$count;
 647         }
 648
 649         my $avhdg = r2d(atan2($sindir, $cosdir));
 650         $avhdg += 360 if $avhdg < 0;
 651         return {w => nearest(0.1,$wind / $count), d => nearest(0.1,$avhdg)};
 652 }
 653
 654 # radians to degrees
 655 sub r2d
 656 {
 657     my $n = shift;
 658     return ($n / pi) * 180;
 659 }
 660
 661 # degrees to radians
 662 sub d2r
 663 {
 664     my $n = shift;
 665     return ($n / 180) * pi;
 666 }
 667
 668 sub calc_rain
 669 {
 670         my $rain = shift;
 671
 672         $ld->{rain24} ||= [];
 673
 674         my $Rain_1h = nearest(0.1, $rain >= $ld->{last_rain_hour} ? $rain - $ld->{last_rain_hour} : $rain); # this is the rate for this hour, so far
 675         my $rm = nearest(0.1, $rain >= $ld->{last_rain_min} ? $rain - $ld->{last_rain_min} : $rain);
 676         my $Rain_1m = nearest(0.1, $rm);
 677         push @{$ld->{rain24}}, $Rain_1m;
 678         $ld->{rain_24} += $rm;
 679         while (@{$ld->{rain24}} > 24*60) {
 680                 $ld->{rain_24} -= shift @{$ld->{rain24}};
 681         }
 682         my $Rain_24h = nearest(0.1, $ld->{rain_24});
 683         return ($Rain_1m, $Rain_1h, $Rain_24h);
 684 }
 685
 686 sub read_ld
 687 {
 688         unless ($dataf) {
 689                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 690                 $dataf->autoflush(1);
 691         }
 692
 693         seek $dataf, 0, 0;
 694         my $s = <$dataf>;
 695         chomp $s;
 696         dbg "read loop data: $s" if isdbg 'json';
 697         $ld = $json->decode($s) if length $s;
 698
 699         # sort out rain stats
 700         my $c;
 701         if ($ld->{rain24} && ($c = @{$ld->{rain24}}) < 24*60) {
 702                 my $diff = 24*60 - $c;
 703                 unshift @{$ld->{rain24}}, 0 for 0 .. $diff;
 704         }
 705         my $rain;
 706
 707         if ($ld->{rain24}) {
 708                 $rain += $_ for @{$ld->{rain24}};
 709         }
 710
 711         $ld->{rain_24} = nearest(0.1, $rain);
 712         delete $ld->{hour};
 713         delete $ld->{min};
 714 }
 715
 716 sub write_ld
 717 {
 718         unless ($dataf) {
 719                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 720                 $dataf->autoflush(1);
 721         }
 722
 723         seek $dataf, 0, 0;
 724         truncate $dataf, 0;
 725         $ld->{ts} = time;
 726         my $s = $json->encode($ld);
 727         dbg "write loop data: $s" if isdbg 'json';
 728         print $dataf "$s\n";
 729 }
 730
 731 sub cycle_loop_data_files
 732 {
 733         $dataf->close if $dataf;
 734         undef $dataf;
 735
 736         rename "$datafn.oooo", "$datafn.ooooo";
 737         rename "$datafn.ooo", "$datafn.oooo";
 738         rename "$datafn.oo", "$datafn.ooo";
 739         rename "$datafn.o", "$datafn.oo";
 740         copy $datafn, "$datafn.o";
 741 }
 742
 743 sub grab_history
 744 {
 745         my $lg = shift;
 746         my $let = shift;
 747         my $start = shift || time - 86400;
 748         my $dayno = shift;
 749         my @out;
 750
 751         if ($lg->open($dayno, 'r+')) {
 752                 while (my $l = $lg->read) {
 753                         next unless $l =~ /,"$let":/;
 754                         my ($t) = $l =~ /"t":(\d+)/;
 755                         if ($t && $t >= $start) {
 756                                 push @out, $l;
 757                         }
 758                 }
 759                 $lg->close;
 760         }
 761         return @out;
 762 }