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: my $dbh;
28: unless (
29: $dbh = DBI->connect("DBI:mysql:loncapa","www","123",{ RaiseError =>0,PrintError=>0})
30: ) {
31: print "Cannot connect to database!\n";
32: exit;
33: }
34: else {
35: $dbh->disconnect;
36: }
37: }
38: $childmaxattempts=10;
39: $run =0;#running counter to generate the query-id
40:
41: # ------------------------------------ Read httpd access.conf and get variables
42: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
43:
44: while ($configline=<CONFIG>) {
45: if ($configline =~ /PerlSetVar/) {
46: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
47: chomp($varvalue);
48: $perlvar{$varname}=$varvalue;
49: }
50: }
51: close(CONFIG);
52:
53: # --------------------------------------------- Check if other instance running
54:
55: my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
56:
57: if (-e $pidfile) {
58: my $lfh=IO::File->new("$pidfile");
59: my $pide=<$lfh>;
60: chomp($pide);
61: if (kill 0 => $pide) { die "already running"; }
62: }
63:
64: # ------------------------------------------------------------- Read hosts file
65: $PREFORK=4; # number of children to maintain, at least four spare
66:
67: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
68:
69: while ($configline=<CONFIG>) {
70: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
71: chomp($ip);
72:
73: $hostip{$ip}=$id;
74:
75: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
76:
77: $PREFORK++;
78: }
79: close(CONFIG);
80:
81: $unixsock = "mysqlsock";
82: my $localfile="$perlvar{'lonSockDir'}/$unixsock";
83: my $server;
84: unlink ($localfile);
85: unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
86: Type => SOCK_STREAM,
87: Listen => 10))
88: {
89: print "in socket error:$@\n";
90: }
91:
92: # -------------------------------------------------------- Routines for forking
93: # global variables
94: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
95: %children = (); # keys are current child process IDs
96: $children = 0; # current number of children
97:
98: sub REAPER { # takes care of dead children
99: $SIG{CHLD} = \&REAPER;
100: my $pid = wait;
101: $children --;
102: &logthis("Child $pid died");
103: delete $children{$pid};
104: }
105:
106: sub HUNTSMAN { # signal handler for SIGINT
107: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
108: kill 'INT' => keys %children;
109: my $execdir=$perlvar{'lonDaemons'};
110: unlink("$execdir/logs/lonsql.pid");
111: &logthis("<font color=red>CRITICAL: Shutting down</font>");
112: $unixsock = "mysqlsock";
113: my $port="$perlvar{'lonSockDir'}/$unixsock";
114: unlink(port);
115: exit; # clean up with dignity
116: }
117:
118: sub HUPSMAN { # signal handler for SIGHUP
119: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
120: kill 'INT' => keys %children;
121: close($server); # free up socket
122: &logthis("<font color=red>CRITICAL: Restarting</font>");
123: my $execdir=$perlvar{'lonDaemons'};
124: $unixsock = "mysqlsock";
125: my $port="$perlvar{'lonSockDir'}/$unixsock";
126: unlink(port);
127: exec("$execdir/lonsql"); # here we go again
128: }
129:
130: sub logthis {
131: my $message=shift;
132: my $execdir=$perlvar{'lonDaemons'};
133: my $fh=IO::File->new(">>$execdir/logs/lonsqlfinal.log");
134: my $now=time;
135: my $local=localtime($now);
136: print $fh "$local ($$): $message\n";
137: }
138: # ---------------------------------------------------- Fork once and dissociate
139: $fpid=fork;
140: exit if $fpid;
141: die "Couldn't fork: $!" unless defined ($fpid);
142:
143: POSIX::setsid() or die "Can't start new session: $!";
144:
145: # ------------------------------------------------------- Write our PID on disk
146:
147: $execdir=$perlvar{'lonDaemons'};
148: open (PIDSAVE,">$execdir/logs/lonsql.pid");
149: print PIDSAVE "$$\n";
150: close(PIDSAVE);
151: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
152:
153: # ----------------------------- Ignore signals generated during initial startup
154: $SIG{HUP}=$SIG{USR1}='IGNORE';
155: # ------------------------------------------------------- Now we are on our own
156: # Fork off our children.
157: for (1 .. $PREFORK) {
158: make_new_child();
159: }
160:
161: # Install signal handlers.
162: $SIG{CHLD} = \&REAPER;
163: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
164: $SIG{HUP} = \&HUPSMAN;
165:
166: # And maintain the population.
167: while (1) {
168: sleep; # wait for a signal (i.e., child's death)
169: for ($i = $children; $i < $PREFORK; $i++) {
170: make_new_child(); # top up the child pool
171: }
172: }
173:
174:
175: sub make_new_child {
176: my $pid;
177: my $sigset;
178:
179: # block signal for fork
180: $sigset = POSIX::SigSet->new(SIGINT);
181: sigprocmask(SIG_BLOCK, $sigset)
182: or die "Can't block SIGINT for fork: $!\n";
183:
184: die "fork: $!" unless defined ($pid = fork);
185:
186: if ($pid) {
187: # Parent records the child's birth and returns.
188: sigprocmask(SIG_UNBLOCK, $sigset)
189: or die "Can't unblock SIGINT for fork: $!\n";
190: $children{$pid} = 1;
191: $children++;
192: return;
193: } else {
194: # Child can *not* return from this subroutine.
195: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
196:
197: # unblock signals
198: sigprocmask(SIG_UNBLOCK, $sigset)
199: or die "Can't unblock SIGINT for fork: $!\n";
200:
201:
202: #open database handle
203: # making dbh global to avoid garbage collector
204: unless (
205: $dbh = DBI->connect("DBI:mysql:loncapa","www","123",{ RaiseError =>0,PrintError=>0})
206: ) {
207: sleep(10+int(rand(20)));
208: &logthis("<font color=blue>WARNING: Couldn't connect to database ($st secs): $@</font>");
209: print "database handle error\n";
210: exit;
211:
212: };
213: # make sure that a database disconnection occurs with ending kill signals
214: $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
215:
216: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
217: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
218: $client = $server->accept() or last;
219:
220: # do something with the connection
221: $run = $run+1;
222: my $userinput = <$client>;
223: chomp($userinput);
224:
225: my ($conserver,$querytmp,
226: $customtmp,$customshowtmp)=split(/&/,$userinput);
227: my $query=unescape($querytmp);
228: my $custom=unescape($customtmp);
229: my $customshow=unescape($customshowtmp);
230:
231: #send query id which is pid_unixdatetime_runningcounter
232: $queryid = $thisserver;
233: $queryid .="_".($$)."_";
234: $queryid .= time."_";
235: $queryid .= $run;
236: print $client "$queryid\n";
237:
238: &logthis("QUERY: $query");
239: &logthis("QUERY: $query");
240: sleep 1;
241: #prepare and execute the query
242: my $sth = $dbh->prepare($query);
243: my $result;
244: my @files;
245: my $subsetflag=0;
246: if ($query) {
247: unless ($sth->execute())
248: {
249: &logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>");
250: $result="";
251: }
252: else {
253: my $r1=$sth->fetchall_arrayref;
254: my @r2;
255: map {my $a=$_;
256: my @b=map {escape($_)} @$a;
257: push @files,@{$a}[3];
258: push @r2,join(",", @b)
259: } (@$r1);
260: $result=join("&",@r2);
261: }
262: }
263: # do custom metadata searching here and build into result
264: if ($custom or $customshow) {
265: &logthis("am going to do custom query for $custom");
266: if ($query) {
267: @metalist=map {$perlvar{'lonDocRoot'}.$_.'.meta'} @files;
268: }
269: else {
270: @metalist=(); pop @metalist;
271: &find("$perlvar{'lonDocRoot'}/res");
272: }
273: # &logthis("FILELIST:" . join(":::",@metalist));
274: # if file is indicated in sql database and
275: # not part of sql-relevant query, do not pattern match.
276: # if file is not in sql database, output error.
277: # if file is indicated in sql database and is
278: # part of query result list, then do the pattern match.
279: my $customresult='';
280: my @r2;
281: foreach my $m (@metalist) {
282: my $fh=IO::File->new($m);
283: my @lines=<$fh>;
284: my $stuff=join('',@lines);
285: if ($stuff=~/$custom/s) {
286: foreach my $f ('abstract','author','copyright',
287: 'creationdate','keywords','language',
288: 'lastrevisiondate','mime','notes',
289: 'owner','subject','title') {
290: $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//;
291: }
292: my $m2=$m; my $docroot=$perlvar{'lonDocRoot'};
293: $m2=~s/^$docroot//;
294: $m2=~s/\.meta$//;
295: unless ($query) {
296: my $q2="select * from metadata where url like '$m2'";
297: my $sth = $dbh->prepare($q2);
298: $sth->execute();
299: my $r1=$sth->fetchall_arrayref;
300: map {my $a=$_;
301: my @b=map {escape($_)} @$a;
302: push @files,@{$a}[3];
303: push @r2,join(",", @b)
304: } (@$r1);
305: }
306: # &logthis("found: $stuff");
307: $customresult.='&custom='.escape($m2).','.escape($stuff);
308: }
309: }
310: $result=join("&",@r2) unless $query;
311: $result.=$customresult;
312: }
313: # reply with result
314: $result.="\n" if $result;
315: &reply("queryreply:$queryid:$result",$conserver);
316:
317: }
318:
319: # tidy up gracefully and finish
320:
321: #close the database handle
322: $dbh->disconnect
323: or &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
324:
325: # this exit is VERY important, otherwise the child will become
326: # a producer of more and more children, forking yourself into
327: # process death.
328: exit;
329: }
330: }
331:
332: sub DISCONNECT {
333: $dbh->disconnect or
334: &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
335: exit;
336: }
337:
338: # -------------------------------------------------- Non-critical communication
339:
340: sub subreply {
341: my ($cmd,$server)=@_;
342: my $peerfile="$perlvar{'lonSockDir'}/$server";
343: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
344: Type => SOCK_STREAM,
345: Timeout => 10)
346: or return "con_lost";
347: print $sclient "$cmd\n";
348: my $answer=<$sclient>;
349: chomp($answer);
350: if (!$answer) { $answer="con_lost"; }
351: return $answer;
352: }
353:
354: sub reply {
355: my ($cmd,$server)=@_;
356: my $answer;
357: if ($server ne $perlvar{'lonHostID'}) {
358: $answer=subreply($cmd,$server);
359: if ($answer eq 'con_lost') {
360: $answer=subreply("ping",$server);
361: $answer=subreply($cmd,$server);
362: }
363: } else {
364: $answer='self_reply';
365: }
366: return $answer;
367: }
368:
369: # -------------------------------------------------------- Escape Special Chars
370:
371: sub escape {
372: my $str=shift;
373: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
374: return $str;
375: }
376:
377: # ----------------------------------------------------- Un-Escape Special Chars
378:
379: sub unescape {
380: my $str=shift;
381: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
382: return $str;
383: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonsql CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom