1: #!/usr/bin/perl
2: # lonsql-based on the preforker:harsha jagasia:date:5/10/00
3: # 7/25 Gerd Kortemeyer
4: # many different dates Scott Harrison
5: # 03/22/2001 Scott Harrison
6: use IO::Socket;
7: use Symbol;
8: use POSIX;
9: use IO::Select;
10: use IO::File;
11: use Socket;
12: use Fcntl;
13: use Tie::RefHash;
14: use DBI;
15:
16: my @metalist;
17: # ----------------- Code to enable 'find' subroutine listing of the .meta files
18: require "find.pl";
19: sub wanted {
20: (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
21: -f _ &&
22: /^.*\.meta$/ &&
23: push(@metalist,"$dir/$_");
24: }
25:
26:
27: $childmaxattempts=10;
28: $run =0;#running counter to generate the query-id
29:
30: # ------------------------------------ Read httpd access.conf and get variables
31: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
32:
33: while ($configline=<CONFIG>) {
34: if ($configline =~ /PerlSetVar/) {
35: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
36: chomp($varvalue);
37: $perlvar{$varname}=$varvalue;
38: }
39: }
40: close(CONFIG);
41:
42: # --------------------------------------------- Check if other instance running
43:
44: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
45:
46: if (-e $pidfile) {
47: my $lfh=IO::File->new("$pidfile");
48: my $pide=<$lfh>;
49: chomp($pide);
50: if (kill 0 => $pide) { die "already running"; }
51: }
52:
53: # ------------------------------------------------------------- Read hosts file
54: $PREFORK=4; # number of children to maintain, at least four spare
55:
56: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
57:
58: while ($configline=<CONFIG>) {
59: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
60: chomp($ip);
61:
62: $hostip{$ip}=$id;
63:
64: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
65:
66: $PREFORK++;
67: }
68: close(CONFIG);
69:
70: $unixsock = "mysqlsock";
71: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
72: my $server;
73: unlink ($localfile);
74: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
75: Type => SOCK_STREAM,
76: Listen => 10))
77: {
78: print "in socket error:$@\n";
79: }
80:
81: # -------------------------------------------------------- Routines for forking
82: # global variables
83: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
84: %children = (); # keys are current child process IDs
85: $children = 0; # current number of children
86:
87: sub REAPER { # takes care of dead children
88: $SIG{CHLD} = \&REAPER;
89: my $pid = wait;
90: $children --;
91: &logthis("Child $pid died");
92: delete $children{$pid};
93: }
94:
95: sub HUNTSMAN { # signal handler for SIGINT
96: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
97: kill 'INT' => keys %children;
98: my $execdir=$perlvar{'lonDaemons'};
99: unlink("$execdir/logs/lonsql.pid");
100: &logthis("<font color=red>CRITICAL: Shutting down</font>");
101: $unixsock = "mysqlsock";
102: my $port="$perlvar{'lonSockDir'}/$unixsock";
103: unlink(port);
104: exit; # clean up with dignity
105: }
106:
107: sub HUPSMAN { # signal handler for SIGHUP
108: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
109: kill 'INT' => keys %children;
110: close($server); # free up socket
111: &logthis("<font color=red>CRITICAL: Restarting</font>");
112: my $execdir=$perlvar{'lonDaemons'};
113: $unixsock = "mysqlsock";
114: my $port="$perlvar{'lonSockDir'}/$unixsock";
115: unlink(port);
116: exec("$execdir/lonsql"); # here we go again
117: }
118:
119: sub logthis {
120: my $message=shift;
121: my $execdir=$perlvar{'lonDaemons'};
122: my $fh=IO::File->new(">>$execdir/logs/lonsqlfinal.log");
123: my $now=time;
124: my $local=localtime($now);
125: print $fh "$local ($$): $message\n";
126: }
127: # ---------------------------------------------------- Fork once and dissociate
128: $fpid=fork;
129: exit if $fpid;
130: die "Couldn't fork: $!" unless defined ($fpid);
131:
132: POSIX::setsid() or die "Can't start new session: $!";
133:
134: # ------------------------------------------------------- Write our PID on disk
135:
136: $execdir=$perlvar{'lonDaemons'};
137: open (PIDSAVE,">$execdir/logs/lonsql.pid");
138: print PIDSAVE "$$\n";
139: close(PIDSAVE);
140: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
141:
142: # ----------------------------- Ignore signals generated during initial startup
143: $SIG{HUP}=$SIG{USR1}='IGNORE';
144: # ------------------------------------------------------- Now we are on our own
145: # Fork off our children.
146: for (1 .. $PREFORK) {
147: make_new_child();
148: }
149:
150: # Install signal handlers.
151: $SIG{CHLD} = \&REAPER;
152: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
153: $SIG{HUP} = \&HUPSMAN;
154:
155: # And maintain the population.
156: while (1) {
157: sleep; # wait for a signal (i.e., child's death)
158: for ($i = $children; $i < $PREFORK; $i++) {
159: make_new_child(); # top up the child pool
160: }
161: }
162:
163:
164: sub make_new_child {
165: my $pid;
166: my $sigset;
167:
168: # block signal for fork
169: $sigset = POSIX::SigSet->new(SIGINT);
170: sigprocmask(SIG_BLOCK, $sigset)
171: or die "Can't block SIGINT for fork: $!\n";
172:
173: die "fork: $!" unless defined ($pid = fork);
174:
175: if ($pid) {
176: # Parent records the child's birth and returns.
177: sigprocmask(SIG_UNBLOCK, $sigset)
178: or die "Can't unblock SIGINT for fork: $!\n";
179: $children{$pid} = 1;
180: $children++;
181: return;
182: } else {
183: # Child can *not* return from this subroutine.
184: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
185:
186: # unblock signals
187: sigprocmask(SIG_UNBLOCK, $sigset)
188: or die "Can't unblock SIGINT for fork: $!\n";
189:
190:
191: #open database handle
192: # making dbh global to avoid garbage collector
193: unless (
194: $dbh = DBI->connect("DBI:mysql:loncapa","www","123",{ RaiseError =>0,PrintError=>0})
195: ) {
196: my $st=120+int(rand(240));
197: &logthis("<font color=blue>WARNING: Couldn't connect to database ($st secs): $@</font>");
198: print "database handle error\n";
199: sleep($st);
200: exit;
201:
202: };
203: # make sure that a database disconnection occurs with ending kill signals
204: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
205:
206: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
207: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
208: $client = $server->accept() or last;
209:
210: # do something with the connection
211: $run = $run+1;
212: my $userinput = <$client>;
213: chomp($userinput);
214:
215: my ($conserver,$querytmp,
216: $customtmp,$customshowtmp)=split(/&/,$userinput);
217: my $query=unescape($querytmp);
218: my $custom=unescape($customtmp);
219: my $customshow=unescape($customshowtmp);
220:
221: #send query id which is pid_unixdatetime_runningcounter
222: $queryid = $thisserver;
223: $queryid .="_".($$)."_";
224: $queryid .= time."_";
225: $queryid .= $run;
226: print $client "$queryid\n";
227:
228: &logthis("QUERY: $query");
229: &logthis("QUERY: $query");
230: sleep 1;
231: #prepare and execute the query
232: my $sth = $dbh->prepare($query);
233: my $result;
234: my @files;
235: my $subsetflag=0;
236: unless ($sth->execute())
237: {
238: &logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>");
239: $result="";
240: }
241: else {
242: my $r1=$sth->fetchall_arrayref;
243: my @r2;
244: map {my $a=$_;
245: my @b=map {escape($_)} @$a;
246: push @files,@{$a}[3];
247: push @r2,join(",", @b)
248: } (@$r1);
249: $result=join("&",@r2);
250: }
251:
252: # do custom metadata searching here and build into result
253: if ($custom) {
254: &logthis("am going to do custom query for $custom");
255: if (@files) {
256: @metalist=map {$perlvar{'lonDocRoot'}.$_.'.meta'} @files;
257: }
258: else {
259: @metalist=(); pop @metalist;
260: &find("$perlvar{'lonDocRoot'}/res");
261: }
262: # &logthis("FILELIST:" . join(":::",@metalist));
263: # if file is indicated in sql database and
264: # not part of sql-relevant query, do not pattern match.
265: # if file is not in sql database, output error.
266: # if file is indicated in sql database and is
267: # part of query result list, then do the pattern match.
268: my $customresult='';
269: foreach my $m (@metalist) {
270: my $fh=IO::File->new($m);
271: my @lines=<$fh>;
272: my $stuff=join('',@lines);
273: if ($stuff=~/$custom/s) {
274: foreach my $f ('abstract','author','copyright',
275: 'creationdate','keywords','language',
276: 'lastrevisiondate','mime','notes',
277: 'owner','subject','title') {
278: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//;
279: }
280: my $m2=$m; my $docroot=$perlvar{'lonDocRoot'};
281: $m2=~s/^$docroot//; $m2=~s/\.meta$//;
282: # &logthis("found: $stuff");
283: $customresult.='&custom='.escape($m2).','.escape($stuff);
284: }
285: }
286: $result.=$customresult;
287: }
288: # reply with result
289: $result.="\n" if $result;
290: &reply("queryreply:$queryid:$result",$conserver);
291:
292: }
293:
294: # tidy up gracefully and finish
295:
296: #close the database handle
297: $dbh->disconnect
298: or &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
299:
300: # this exit is VERY important, otherwise the child will become
301: # a producer of more and more children, forking yourself into
302: # process death.
303: exit;
304: }
305: }
306:
307: sub DISCONNECT {
308: $dbh->disconnect or
309: &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
310: exit;
311: }
312:
313: # -------------------------------------------------- Non-critical communication
314:
315: sub subreply {
316: my ($cmd,$server)=@_;
317: my $peerfile="$perlvar{'lonSockDir'}/$server";
318: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
319: Type => SOCK_STREAM,
320: Timeout => 10)
321: or return "con_lost";
322: print $sclient "$cmd\n";
323: my $answer=<$sclient>;
324: chomp($answer);
325: if (!$answer) { $answer="con_lost"; }
326: return $answer;
327: }
328:
329: sub reply {
330: my ($cmd,$server)=@_;
331: my $answer;
332: if ($server ne $perlvar{'lonHostID'}) {
333: $answer=subreply($cmd,$server);
334: if ($answer eq 'con_lost') {
335: $answer=subreply("ping",$server);
336: $answer=subreply($cmd,$server);
337: }
338: } else {
339: $answer='self_reply';
340: }
341: return $answer;
342: }
343:
344: # -------------------------------------------------------- Escape Special Chars
345:
346: sub escape {
347: my $str=shift;
348: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
349: return $str;
350: }
351:
352: # ----------------------------------------------------- Un-Escape Special Chars
353:
354: sub unescape {
355: my $str=shift;
356: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
357: return $str;
358: }
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