2 # FlightGear METAR proxy server
3 # Melchior FRANZ (c) 2005, <mfranz@aon.at>, GPL V2
7 # 1) fill cache, for example with:
8 # $ metarproxy --download 3h
10 # 2) run proxy with FlightGear:
11 # $ metarproxy -c -v &
12 # $ fgfs --enable-real-weather-fetch --proxy=localhost:5509 --start-date-lat=2005:01:11:12:00:00
19 my $HOME = $ENV{'HOME'} || ".";
20 my $FG_HOME = $ENV{'FG_HOME'} || $HOME . "/.fgfs";
21 my $BASE = $FG_HOME . "/metar";
22 my $SERVER = "weather.noaa.gov";
24 my $PROXY = $ENV{'http_proxy'};
25 my $METAR_MAX_AGE = 250 * 60;
26 my $METAR_DEFAULT = "00000KT 15KM CLR 15/00 A3000";
27 my @COLOR = ("31;1", "31", "32", "", "36;1");
33 metarproxy [-v] [-b <path>] [-p <port>] [--serve]
34 metarproxy [-v] [-b <path>] [-y <proxy>] --download <list of: all|7|0-10|6h>
35 metarproxy [-v] [-b <path>] [-y <proxy>] --record [<list of station IDs>] [-f <path>]
36 metarproxy [-v] [-b <path>] --install <list of metar files>
41 -s|--serve start proxy server (default)
42 -p|--port set port (default: $PORT)
45 -d|--download <list of hours>
46 "all" ... whole day (24 files)
47 <number> ... this hour (example: 6)
48 <range> ... these hours (example: 2-5)
49 <period> ... last n hours (example: 3h)
50 -y|--proxy use proxy (default: off)
53 -i|--install <list of files to install>
56 -r|--record <list of METAR station IDs (ICAO)>
57 -f|--file <file containing list of station IDs>
58 -y|--proxy use proxy (default: off)
61 -b|--base set base directory (default: \$FG_HOME/metar)
62 -c|--color toggle color mode (default: off)
63 -v|--verbose increase verbosity level (default: off; maximum: -vvvv)
65 -q|--quiet only show error messages
67 -V|--version return version number
70 FG_HOME ... FlightGear home directory (default: \$HOME/.fgfs)
71 METARPROXY ... default options (e.g. export METARPROXY='-vv --color')
72 http_proxy ... system wide proxy setting (currently: '$PROXY')
75 \$ metarproxy -b\$HOME/.fgfs/metar --download 3h
76 \$ metarproxy --proxy=http://localhost:3128 --download all
77 \$ metarproxy --download 3h 7 21-23
78 \$ metarproxy --record -f/tmp/list LOWW LOWL
79 \$ metarproxy -b/var/tmp/metar --install /tmp/*Z.TXT
80 \$ metarproxy -p5600 & fgfs --proxy=localhost:5600 --enable-real-weather-fetch
81 \$ http_proxy= metarproxy --record LOXL
84 http://weather.noaa.gov/pub/data/observations/metar/{stations,cycles}/
85 ftp://weather.noaa.gov/data/observations/metar/{stations,cycles}/
94 my $VERBOSITY = $INFO;
101 # main =======================================================================
107 map { return $_ if defined $_ and $_ ne "" } @_;
112 unshift @ARGV, split / /, $ENV{'METARPROXY'} if defined $ENV{'METARPROXY'};
116 # dissolve glued together short options (e.g. -cvv)
117 if (/^-([^-]{2,})$/) {
119 map { unshift @ARGV, "-$_" } split //, $1;
124 } elsif (/^(-d|--download)$/) {
126 } elsif (/^(-i|--install)$/) {
128 } elsif (/^(-r|--record)$/) {
130 } elsif (/^(-s|--server?)$/) {
132 } elsif (/^(-b(.*)|--base(=(.*))?)/) {
133 my $path = &argument($2, $4);
134 defined $path or &fatal("-b|--base option lacks <path> argument");
135 $path =~ s/^~/$HOME/;
137 &log($BULK, "set option --base: '$BASE'");
138 } elsif (/^(-f(.*)|--file(=(.*))?)$/) {
139 my $file = &argument($2, $4);
140 defined $file or &fatal("-f|--file option lacks <path> argument");
141 &log($BULK, "set option --file: '$file'");
142 &read_icao_file($file);
143 } elsif (/^(-p(.*)|--port(=(.*))?)$/) {
144 $PORT = &argument($2, $4);
145 defined $PORT or &fatal("--port option lacks <port number> argument");
146 &log($BULK, "set option --port: '$PORT'");
147 } elsif (/^(-y(.*)|--proxy(=(.*))?)$/) {
148 $PROXY = &argument($2, $4);
149 defined $PROXY or &fatal("--proxy option lacks <host> definition");
150 &log($BULK, "set option --proxy: '$PROXY'");
151 } elsif (/^(-v|--verbose)$/) {
153 } elsif (/^(-q|--quiet)$/) {
155 } elsif (/^(-h|--help)$/) {
158 } elsif (/^(-V|--version)$/) {
159 ($_ = '$Revision$') =~ s/.*(\d+\.\d+).*/print "$1\n"/e;
161 } elsif (/^(-c|--color)$/) {
162 $USECOLOR = !$USECOLOR;
164 &fatal("unknown option $_");
174 undef $PROXY if $PROXY eq "";
175 my $mode = &parse_options();
178 -d $FG_HOME or mkdir $FG_HOME or &fatal("cannot create directory $FG_HOME ($!)");
179 -d $BASE or mkdir $BASE or &fatal("cannot create directory $BASE ($!)");
181 if (defined $PROXY) {
182 $PROXY =~ m|^(http://)?([a-zA-Z][a-zA-Z0-9-.]*):(\d+)/?| or &fatal("invalid proxy address: '$PROXY'");
183 ($PROXYHOST, $PROXYPORT) = ($2, $3);
189 } elsif ($mode == 2) {
191 } elsif ($mode == 3) {
193 } elsif ($mode == 4) {
194 &log($ERR, "ignoring command line args: " . (join ", ", @ITEMS)) if @ITEMS;
201 sub read_icao_file($)
204 $path =~ s/^\~/$HOME/;
206 if (!open(F, "<$path")) {
207 &log($ERR, "cannot open station list $path ($!)");
213 if (/^[A-Z][A-Z0-9]{3}$/) {
216 &log($ERR, "discarding suspicious station from $path: $_");
220 close F or &log($ERR, "cannot close station list $path ($!)");
224 # download ===================================================================
238 map { $h{$_} = 1 } (0 .. 23);
239 } elsif (/^(\d+)-(\d+)$/) {
240 map { $h{$_} = 1 } (&norm($1) .. &norm($2));
241 } elsif (/^(\d+)h$/) {
242 my $to = (gmtime(time))[2];
243 my $from = $to - &norm($1) + 1;
245 map { $h{$_} = 1 } ((24 + $from) .. 23);
248 map { $h{$_} = 1 } ($from .. $to);
249 } elsif (/^(\d+)$/) {
252 &log($ERR, "illegal download argument '$_' ignored");
255 @ITEMS = sort { $a <=> $b } keys %h;
256 @ITEMS or &fatal("nothing to download");
257 &log($INFO, "downloading: " . (join ", ", @ITEMS));
259 my $file = sprintf "/pub/data/observations/metar/cycles/%02dZ.TXT", $_;
260 &install_metar_http($SERVER, "80", $file);
266 # install ====================================================================
271 foreach my $file (@ITEMS) {
272 &log($INFO, "installing $file");
274 &log($ERR, "file $file doesn't exist");
277 if (!open (IN, "<$file")) {
278 &log($ERR, "cannot open $file ($!)");
282 &install_metar($_) foreach <IN>;
283 close IN or &log($ERR, "cannot close $file ($!)");
289 # install a METAR string KSFO under $FG_HOME/metar/2005-01-12/K/KS/KSFO
293 return unless $metar =~ /^(\d{4})\/(\d+)\/(\d+)\s(\d+):(\d+).*\015?\012([A-Z])([A-Z0-9])([A-Z0-9]{2})\s/s;
295 my $name = sprintf "$BASE/%04d-%02d-%02d", $1, $2, $3;
296 -d $name or mkdir $name or &fatal("cannot create directory $name ($!)");
298 -d $name or mkdir $name or &fatal("cannot create directory $name ($!)");
300 -d $name or mkdir $name or &fatal("cannot create directory $name ($!)");
304 if (open(F, "<$name")) {
307 if (m|^$1/$2/$3 $4:$5\s|s) {
312 close F or &log($ERR, "cannot close file $name ($!)");
313 return if defined $found;
315 &log($INFO, "writing to $name");
317 open(F, ">>$name") or &fatal("cannot append to file $name ($!)");
319 close F or &log($ERR, "cannot close file $name ($!)");
324 sub install_metar_http($$$)
326 my ($server, $port, $addr) = @_;
327 &log($INFO, "installing data from http://$server:$port$addr");
328 if (defined $PROXYHOST) {
329 &log($INFO, "via proxy http://$PROXYHOST:$PROXYPORT");
330 $addr = "http://$server" . $addr;
331 ($server, $port) = ($PROXYHOST, $PROXYPORT);
334 my $socket = IO::Socket::INET->new(Proto => "tcp", PeerAddr => $server, PeerPort => $port);
335 $socket or &fatal("cannot connect to http://$server:$port$addr/ ($!)");
336 $socket->autoflush(1);
337 my $get = "GET $addr HTTP/1.0";
338 print $socket "$get\015\012\015\012";
339 &log($DEBUG, ":$get:");
345 &log($DEBUG, "[$_]");
348 foreach (<$socket>) {
349 &install_metar("$_\n");
351 close($socket) or &log($ERR, "cannot close INET socket ($!)");
356 # record =====================================================================
361 @ITEMS or &fatal("no stations given");
364 # check for validity and remove duplicates
366 if (/^[A-Z][A-Z0-9]{3}$/) {
369 &log($ERR, "discarding invalid station '$_'");
372 @ITEMS = sort keys %h;
374 &log($INFO, "recording stations @ITEMS");
377 &install_metar_http($SERVER, "80", "/pub/data/observations/metar/stations/$_.TXT");
379 &log($INFO, "sleeping ...");
385 # serve ======================================================================
390 my $server = IO::Socket::INET->new(Proto => 'tcp', LocalPort => $PORT, Listen => SOMAXCONN, Reuse => 1);
391 $server or &fatal("cannot setup server ($!)");
392 &log($BULK, "server $0 accepting clients on port $PORT");
394 while (my $client = $server->accept()) {
395 $client->autoflush(1);
396 my $hostinfo = gethostbyaddr($client->peeraddr);
397 my $clientname = $hostinfo->name || $client->peerhost;
398 my $addr = inet_ntoa(inet_aton($clientname));
405 if (m|^GET\s+http://weather.noaa.gov/.*/([A-Z][A-Z0-9]{3}).TXT\s+HTTP/|) {
407 } elsif (/X-Time: (\d+)/) {
412 &log($INFO, "$_") if $VERBOSITY < $DEBUG;
416 if (defined $icao and defined $epoch) {
417 my ($min, $hour, $day, $mon, $year) = (gmtime($epoch))[1 .. 5];
420 &log($BULK, sprintf "client '$clientname' [$addr] requests data for station $icao "
421 . "at %04d/%02d/%02d %02d:%02d", $year, $mon, $day, $hour, $min);
423 my ($metar, $age) = &get_metar($icao, $epoch);
424 if (defined $metar) {
425 if ($age <= $METAR_MAX_AGE) {
426 &log($BULK, "found (" . int($age / 60) . " min old)");
428 $METAR_DEFAULT = $metar;
429 $METAR_DEFAULT =~ s/.*\015?\012[A-Z0-9]{4}\s+[0-9]{6}Z\s+//s;
430 &log($DEBUG, "setting default to '$METAR_DEFAULT'");
431 $metar =~ s/\015?\012/\015\012/g;
433 &log($INFO, "found, but too old (" . int($age / 60) . " min)");
437 &log($WARN, "not found!");
440 if (!defined $metar) {
441 &log($INFO, "sending last successful data again");
442 $metar = sprintf "%04d/%02d/%02d %02d:%02d\015\012",
443 $year, $mon, $day, $hour, $min;
444 $metar .= sprintf "$icao %02d%02d%02dZ $METAR_DEFAULT",
447 print $client "Content-Type: text/plain\015\012"
448 . "X-MetarProxy: nasse Maus\015\012"
453 &log($WARN, "incomplete request");
455 &log($BULK, "closing connection");
464 my $rq_epoch = shift;
465 $icao =~ /^([A-Z])([A-Z0-9])([A-Z0-9]{2})$/;
470 my ($hour, $day, $mon, $year) = (gmtime($time))[2 .. 5];
471 my $name = sprintf "$BASE/%04d-%02d-%02d/$1/$1$2/$1$2$3", $year + 1900, $mon + 1, $day;
472 if (open (F, "<$name")) {
473 &log($BULK, "reading $name");
476 close F or &log($ERR, "cannot close file $name ($!)");
478 &log($BULK, "no file $name to read ($!)");
482 my @list; # "today" (and maybe "yesterday")
483 &scan_file($rq_epoch, \@list) and &scan_file($rq_epoch - 24 * 60 * 60, \@list);
488 /^(\d{4})\/(\d+)\/(\d+)\s(\d+):(\d+).*\015?\012$icao\s/s or next;
489 $epoch = timegm(0, $5, $4, $3, $2 - 1, $1 - 1900);
490 next if $epoch > $rq_epoch; # lies in the future
491 next if $rq_epoch - $epoch > $age; # older than previous entry
493 $age = $rq_epoch - $epoch;
495 return ($metar, $age);
499 # ==================================================================
504 &log($ERR, "$0: @_");
512 return if $v > $VERBOSITY;
514 print "\033[$COLOR[$v]m" if $USECOLOR;
516 print "\033[m" if $USECOLOR;