root/lib/Resmon/Status.pm

Revision 3af30fc23cb5f6280463367270acd60533eb3134, 11.3 kB (checked in by Mark Harrison <mark@omniti.com>, 6 years ago)

Merge -r94:95 from markdevel to trunk (xml escapes)

git-svn-id: https://labs.omniti.com/resmon/trunk@96 8c0face9-b7db-6ec6-c4b3-d5f7145c7d55

  • Property mode set to 100644
Line 
1 package Resmon::Status;
2
3 use strict;
4 use POSIX qw/:sys_wait_h/;
5 use IO::Handle;
6 use IO::File;
7 use IO::Socket;
8 use Socket;
9 use Fcntl qw/:flock/;
10 use IPC::SysV qw /IPC_PRIVATE IPC_CREAT IPC_RMID ftok S_IRWXU S_IRWXG S_IRWXO/;
11 use Data::Dumper;
12
13 my $SEGSIZE = 1024*256;
14 my $KEEPALIVE_TIMEOUT = 5;
15 my $REQUEST_TIMEOUT = 60;
16 sub new {
17   my $class = shift;
18   my $file = shift;
19   return bless {
20     file => $file
21   }, $class;
22 }
23 sub get_shared_state {
24   my $self = shift;
25   my $blob;
26   my $len;
27   return unless(defined($self->{shared_state}));
28   # Lock shared segment
29   # Read in
30   shmread($self->{shared_state}, $len, 0, length(pack('i', 0)));
31   $len = unpack('i', $len);
32   shmread($self->{shared_state}, $blob, length(pack('i', 0)), $len);
33   # unlock
34   my $VAR1;
35   eval $blob;
36   die $@ if ($@);
37   $self->{store} = $VAR1;
38   return $self->{store};
39 }
40 sub store_shared_state {
41   my $self = shift;
42   return unless(defined($self->{shared_state}));
43   my $blob = Dumper($self->{store});
44
45   # Lock shared segment
46   # Write state and flush
47   shmwrite($self->{shared_state}, pack('i', length($blob)),
48            0, length(pack('i', 0))) || die "$!";
49   shmwrite($self->{shared_state}, $blob, length(pack('i', 0)),
50            length($blob)) || die "$!";
51   # unlock
52 }
53 sub xml_kv_dump {
54   my $info = shift;
55   my $indent = shift || 0;
56   my $rv = '';
57   while(my ($key, $value) = each %$info) {
58     $rv .= " " x $indent;
59     if(ref $value eq 'HASH') {
60       $rv .= "<$key>\n";
61       $rv .= xml_kv_dump($value, $indent + 2);
62       $rv .= " " x $indent;
63       $rv .= "</$key>\n";
64     }
65     else {
66       $value =~ s/&/&amp;/g;
67       $value =~ s/</&lt;/g;
68       $value =~ s/>/&gt;/g;
69       $value =~ s/'/&apos;/g;
70       $rv .= "<$key>$value</$key>\n";
71     }
72   }
73   return $rv;
74 }
75 sub xml_info {
76   my ($module, $service, $info) = @_;
77   my $rv = '';
78   $rv .= "  <ResmonResult module=\"$module\" service=\"$service\">\n";
79   $rv .= xml_kv_dump($info, 4);
80   $rv .= "  </ResmonResult>\n";
81   return $rv;
82 }
83 sub dump_generic {
84   my $self = shift;
85   my $dumper = shift;
86   my $rv = '';
87   while(my ($module, $services) = each %{$self->{store}}) {
88     while(my ($service, $info) = each %$services) {
89       $rv .= $dumper->($module,$service,$info);
90     }
91   }
92   return $rv;
93 }
94 sub dump_oldstyle {
95   my $self = shift;
96   my $response = $self->dump_generic(sub {
97     my($module,$service,$info) = @_;
98     return "$service($module) :: $info->{state}($info->{message})\n";
99   });
100   return $response;
101 }
102 sub dump_xml {
103   my $self = shift;
104   my $response = <<EOF
105 <?xml version="1.0" encoding="UTF-8"?>
106 <?xml-stylesheet type="text/xsl" href="/resmon.xsl"?>
107 <ResmonResults>
108 EOF
109   ;
110   $response .= $self->dump_generic(\&xml_info);
111   $response .= "</ResmonResults>\n";
112   return $response;
113 }
114 sub get_xsl() {
115   my $response = <<EOF
116 <?xml version="1.0" encoding="ISO-8859-1"?>
117 <xsl:stylesheet version="1.0"
118     xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
119 <xsl:template match="ResmonResults">
120 <html>
121 <head>
122     <title>Resmon Results</title>
123     <link rel="stylesheet" type="text/css" href="/resmon.css" />
124 </head>
125 <body>
126     <xsl:for-each select="ResmonResult">
127         <div class="item">
128                 <xsl:attribute name="class">
129                     item <xsl:value-of select="state" />
130                 </xsl:attribute>
131             <h1>
132                 <xsl:value-of select="\@module" /> -
133                 <xsl:value-of select="\@service" />
134             </h1>
135             <h2>
136                 <xsl:value-of select="state"/>:
137                 <xsl:value-of select="message" />
138             </h2>
139             <ul>
140                 <li>Time taken for last check:
141                     <xsl:value-of select="last_runtime_seconds" /></li>
142                 <li>Last updated:
143                     <xsl:value-of select="last_update" /></li>
144             </ul>
145             <h2>Configuration</h2>
146             <table>
147                 <tr>
148                     <th>Name</th>
149                     <th>Value</th>
150                 </tr>
151                 <xsl:for-each select="configuration/*">
152                     <tr>
153                         <td><xsl:value-of select="name(.)" /></td>
154                         <td><xsl:value-of select="." /></td>
155                     </tr>
156                 </xsl:for-each>
157             </table>
158         </div>
159     </xsl:for-each>
160 </body>
161 </html>
162 </xsl:template>
163 </xsl:stylesheet>
164 EOF
165   ;
166   return $response;
167 }
168 sub get_css() {
169   my $response=<<EOF
170 body {
171     font-family: Verdana, Arial, helvetica, sans-serif;
172 }
173 h1 {
174     margin: 0;
175     font-size: 120%;
176 }
177
178 h2 {
179     margin: 0;
180     font-sizE: 110%;
181 }
182
183 .item {
184     border: 1px solid black;
185     padding: 1em;
186     margin: 2em;
187     background-color: #eeeeee;
188 }
189
190 .OK {
191     background-color: #afa;
192 }
193
194 .WARNING {
195     background-color: #ffa;
196 }
197
198 .BAD {
199     background-color: #faa;
200 }
201
202 table {
203     border: 1px solid black;
204     background-color: #eeeeee;
205     border-collapse: collapse;
206     margin: 1em;
207     font-size: 80%;
208 }
209
210 th {
211     font-size: 100%;
212     font-weight: bold;
213     background-color: black;
214     color: white;
215 }
216
217 td {
218     padding-left: 1em;
219     padding-right: 1em;
220 }
221 EOF
222   ;
223   return $response;
224 }
225 sub service {
226   my $self = shift;
227   my ($client, $req, $proto, $snip) = @_;
228   my $state = $self->get_shared_state();
229   if($req eq '/' or $req eq '/status') {
230     my $response .= $self->dump_xml();
231     $client->print(http_header(200, length($response), 'text/xml', $snip));
232     $client->print($response . "\r\n");
233     return;
234   } elsif($req eq '/status.txt') {
235     my $response = $self->dump_oldstyle();
236     $client->print(http_header(200, length($response), 'text/plain', $snip));
237     $client->print($response . "\r\n");
238     return;
239   } elsif($req eq '/resmon.xsl') {
240     my $response = $self->get_xsl();
241     $client->print(http_header(200, length($response), 'text/xml', $snip));
242     $client->print($response . "\r\n");
243     return;
244   } elsif($req eq '/resmon.css') {
245     my $response = $self->get_css();
246     $client->print(http_header(200, length($response), 'text/css', $snip));
247     $client->print($response . "\r\n");
248     return;
249   } else {
250     if($req =~ /^\/([^\/]+)\/(.+)$/) {
251       if(exists($self->{store}->{$1}) &&
252          exists($self->{store}->{$1}->{$2})) {
253         my $info = $self->{store}->{$1}->{$2};
254         my $response = qq^<?xml version="1.0" encoding="UTF-8"?>\n^;
255         my $response .= qq^<?xml-stylesheet type="text/xsl" href="/resmon.xsl"?>^;
256         $response .= "<ResmonResults>\n".
257                      xml_info($1,$2,$info).
258                      "</ResmonResults>\n";
259         $client->print(http_header(200, length($response), 'text/xml', $snip));
260         $client->print( $response . "\r\n");
261         return;
262       }
263     }
264   }
265   die "Request not understood\n";
266 }
267 sub http_header {
268   my $code = shift;
269   my $len = shift;
270   my $type = shift || 'text/xml';
271   my $close_connection = shift || 1;
272   return qq^HTTP/1.0 $code OK
273 Server: resmon
274 ^ . (defined($len) ? "Content-length: $len\n" : "") .
275     (($close_connection || !$len) ? "Connection: close\n" : "") .
276 qq^Content-Type: $type; charset=utf-8
277
278 ^;
279 }
280 sub serve_http_on {
281   my $self = shift;
282   my $ip = shift;
283   my $port = shift;
284   $ip = INADDR_ANY if(!defined($ip) || $ip eq '' || $ip eq '*');
285   $port ||= 81;
286
287   my $handle = IO::Socket->new();
288   socket($handle, PF_INET, SOCK_STREAM, getprotobyname('tcp'))
289     || die "socket: $!";
290   setsockopt($handle, SOL_SOCKET, SO_REUSEADDR, pack("l", 1))
291     || die "setsockopt: $!";
292   bind($handle, sockaddr_in($port, $ip))
293     || die "bind: $!";
294   listen($handle,SOMAXCONN);
295
296   $self->{zindex} = 0;
297   if (-x "/usr/sbin/zoneadm") {
298     open(Z, "/usr/sbin/zoneadm list -p |");
299     my $firstline = <Z>;
300     close(Z);
301     ($self->{zindex}) = split /:/, $firstline, 2;
302   }
303   $self->{http_port} = $port;
304   $self->{http_ip} = $ip;
305   $self->{ftok_number} = $port * (1 + $self->{zindex});
306
307   $self->{child} = fork();
308   if($self->{child} == 0) {
309     eval {
310       while(my $client = $handle->accept) {
311         my $req;
312         my $proto;
313         my $close_connection;
314         local $SIG{ALRM} = sub { die "timeout\n" };
315         eval {
316           alarm($KEEPALIVE_TIMEOUT);
317           while(<$client>) {
318             alarm($REQUEST_TIMEOUT);
319             eval {
320               s/\r\n/\n/g;
321               chomp;
322               if(!$req) {
323                 if(/^GET \s*(\S+)\s*?(?: HTTP\/(0\.9|1\.0|1\.1)\s*)?$/) {
324                   $req = $1;
325                   $proto = $2;
326                   # Protocol 1.1 and high are keep-alive by default
327                   $close_connection = ($proto <= 1.0)?1:0;
328                 }
329                 elsif(/./) {
330                   die "protocol deviations.\n";
331                 }
332               }
333               else {
334                 if(/^$/) {
335                   $self->service($client, $req, $proto, $close_connection);
336                   last if ($close_connection);
337                   alarm($KEEPALIVE_TIMEOUT);
338                   $req = undef;
339                   $proto = undef;
340                 }
341                 elsif(/^\S+\s*:\s*.{1,4096}$/) {
342                   # Valid request header... noop
343                   if(/^Connection: (\S+)/) {
344                     if(($proto <= 1.0 && lc($2) eq 'keep-alive') ||
345                        ($proto == 1.1 && lc($2) ne 'close')) {
346                       $close_connection = 0;
347                     }
348                   }
349                 }
350                 else {
351                   die "protocol deviations.\n";
352                 }
353               }
354             };
355             if($@) {
356               print $client http_header(500, 0, 'text/plain', 1);
357               print $client "$@\r\n";
358               last;
359             }
360           }
361           alarm(0);
362         };
363         alarm(0) if($@);
364         $client->close();
365       }
366     };
367     if($@) {
368       print STDERR "Error in listener: $@\n";
369     }
370     exit(0);
371   }
372   close($handle);
373   return;
374 }
375 sub open {
376   my $self = shift;
377   return 0 unless(ref $self);
378   return 1 if($self->{handle});  # Alread open
379   if($self->{file} eq '-' || !defined($self->{file})) {
380     $self->{handle_is_stdout} = 1;
381     $self->{handle} = IO::File->new_from_fd(fileno(STDOUT), "w");
382     return 1;
383   }
384   $self->{handle} = IO::File->new("> $self->{file}.swap");
385   die "open $self->{file}.swap failed: $!\n" unless($self->{handle});
386   $self->{swap_on_close} = 1; # move this to a non .swap version on close
387   chmod 0644, "$self->{file}.swap";
388
389   unless(defined($self->{shared_state})) {
390     $self->{shared_state} = shmget(IPC_PRIVATE, $SEGSIZE,
391                                    IPC_CREAT|S_IRWXU|S_IRWXG|S_IRWXO);
392     die "$0: $!" if($self->{shared_state} == -1);
393   }
394   return 1;
395 }
396 sub store {
397   my ($self, $type, $name, $info) = @_;
398   %{$self->{store}->{$type}->{$name}} = %$info;
399   $self->{store}->{$type}->{$name}->{last_update} = time;
400   $self->store_shared_state();
401   if($self->{handle}) {
402     $self->{handle}->print("$name($type) :: $info->{state}($info->{message})\n");
403   } else {
404     print "$name($type) :: $info->{state}($info->{message})\n";
405   }
406 }
407 sub close {
408   my $self = shift;
409   return if($self->{handle_is_stdout});
410   $self->{handle}->close() if($self->{handle});
411   $self->{handle} = undef;
412   if($self->{swap_on_close}) {
413     unlink("$self->{file}");
414     link("$self->{file}.swap", $self->{file});
415     unlink("$self->{file}.swap");
416     delete($self->{swap_on_close});
417   }
418 }
419 sub DESTROY {
420   my $self = shift;
421   my $child = $self->{child};
422   if($child) {
423     kill 15, $child;
424     sleep 1;
425     kill 9, $child if(kill 0, $child);
426     waitpid(-1,WNOHANG);
427   }
428   if(defined($self->{shared_state})) {
429     shmctl($self->{shared_state}, IPC_RMID, 0);
430   }
431 }
432 1;
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