Annotation of loncom/lonsql, revision 1.9
1.1 harris41 1: #!/usr/bin/perl
1.2 harris41 2: # lonsql-based on the preforker:harsha jagasia:date:5/10/00
1.4 www 3: # 7/25 Gerd Kortemeyer
1.6 harris41 4: # many different dates Scott Harrison
1.7 harris41 5: # 03/22/2001 Scott Harrison
1.2 harris41 6: use IO::Socket;
7: use Symbol;
1.1 harris41 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:
1.9 ! harris41 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:
1.1 harris41 26:
27: $childmaxattempts=10;
1.2 harris41 28: $run =0;#running counter to generate the query-id
29:
1.1 harris41 30: # ------------------------------------ Read httpd access.conf and get variables
31: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
32:
33: while ($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);
1.4 www 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: }
1.1 harris41 52:
53: # ------------------------------------------------------------- Read hosts file
1.2 harris41 54: $PREFORK=4; # number of children to maintain, at least four spare
1.1 harris41 55:
56: open (CONFIG,"$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:
1.2 harris41 62: $hostip{$ip}=$id;
1.1 harris41 63:
64: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
65:
1.2 harris41 66: $PREFORK++;
1.1 harris41 67: }
68: close(CONFIG);
69:
1.2 harris41 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: }
1.1 harris41 80:
81: # -------------------------------------------------------- Routines for forking
82: # global variables
1.2 harris41 83: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
1.1 harris41 84: %children = (); # keys are current child process IDs
1.2 harris41 85: $children = 0; # current number of children
1.1 harris41 86:
87: sub REAPER { # takes care of dead children
88: $SIG{CHLD} = \&REAPER;
89: my $pid = wait;
1.2 harris41 90: $children --;
91: &logthis("Child $pid died");
1.1 harris41 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>");
1.2 harris41 101: $unixsock = "mysqlsock";
102: my $port="$perlvar{'lonSockDir'}/$unixsock";
103: unlink(port);
1.1 harris41 104: exit; # clean up with dignity
105: }
106:
107: sub HUPSMAN { # signal handler for SIGHUP
108: local($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'};
1.2 harris41 113: $unixsock = "mysqlsock";
114: my $port="$perlvar{'lonSockDir'}/$unixsock";
115: unlink(port);
1.1 harris41 116: exec("$execdir/lonsql"); # here we go again
117: }
118:
119: sub logthis {
120: my $message=shift;
121: my $execdir=$perlvar{'lonDaemons'};
1.2 harris41 122: my $fh=IO::File->new(">>$execdir/logs/lonsqlfinal.log");
1.1 harris41 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';
1.2 harris41 144: # ------------------------------------------------------- Now we are on our own
145: # Fork off our children.
146: for (1 .. $PREFORK) {
147: make_new_child();
1.1 harris41 148: }
149:
1.2 harris41 150: # Install signal handlers.
1.1 harris41 151: $SIG{CHLD} = \&REAPER;
152: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
153: $SIG{HUP} = \&HUPSMAN;
154:
155: # And maintain the population.
156: while (1) {
157: sleep; # wait for a signal (i.e., child's death)
1.2 harris41 158: for ($i = $children; $i < $PREFORK; $i++) {
159: make_new_child(); # top up the child pool
1.1 harris41 160: }
161: }
162:
1.2 harris41 163:
1.1 harris41 164: sub make_new_child {
165: my $pid;
166: my $sigset;
1.2 harris41 167:
1.1 harris41 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:
1.2 harris41 173: die "fork: $!" unless defined ($pid = fork);
174:
1.1 harris41 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 {
1.2 harris41 183: # Child can *not* return from this subroutine.
1.1 harris41 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";
1.2 harris41 189:
190:
191: #open database handle
192: # making dbh global to avoid garbage collector
1.1 harris41 193: unless (
1.5 harris41 194: $dbh = DBI->connect("DBI:mysql:loncapa","www","123",{ RaiseError =>0,PrintError=>0})
1.1 harris41 195: ) {
196: my $st=120+int(rand(240));
197: &logthis("<font color=blue>WARNING: Couldn't connect to database ($st secs): $@</font>");
1.2 harris41 198: print "database handle error\n";
1.1 harris41 199: sleep($st);
1.2 harris41 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:
1.1 harris41 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;
1.2 harris41 209:
210: # do something with the connection
1.1 harris41 211: $run = $run+1;
1.2 harris41 212: my $userinput = <$client>;
213: chomp($userinput);
214:
1.7 harris41 215: my ($conserver,$querytmp,$customtmp)=split(/&/,$userinput);
1.3 harris41 216: my $query=unescape($querytmp);
1.7 harris41 217: my $custom=unescape($customtmp);
1.2 harris41 218:
219: #send query id which is pid_unixdatetime_runningcounter
220: $queryid = $thisserver;
221: $queryid .="_".($$)."_";
222: $queryid .= time."_";
223: $queryid .= $run;
224: print $client "$queryid\n";
225:
226: #prepare and execute the query
1.3 harris41 227: my $sth = $dbh->prepare($query);
228: my $result;
229: unless ($sth->execute())
230: {
231: &logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>");
232: $result="";
233: }
234: else {
235: my $r1=$sth->fetchall_arrayref;
236: my @r2; map {my $a=$_; my @b=map {escape($_)} @$a; push @r2,join(",", @b)} (@$r1);
237: $result=join("&",@r2) . "\n";
238: }
1.7 harris41 239:
240: # do custom metadata searching here and build into result
1.9 ! harris41 241: if ($custom) {
! 242: &logthis("am going to do custom query for $custom");
! 243: @metalist=(); pop @metalist;
! 244: &find("$perlvar{'lonDocRoot'}/res");
! 245: &logthis("FILELIST:" . join(":::",@metalist));
! 246: }
1.8 harris41 247: # reply with result
1.2 harris41 248: &reply("queryreply:$queryid:$result",$conserver);
249:
1.1 harris41 250: }
251:
252: # tidy up gracefully and finish
1.2 harris41 253:
254: #close the database handle
255: $dbh->disconnect
256: or &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
1.1 harris41 257:
258: # this exit is VERY important, otherwise the child will become
259: # a producer of more and more children, forking yourself into
260: # process death.
261: exit;
262: }
1.2 harris41 263: }
1.1 harris41 264:
1.2 harris41 265: sub DISCONNECT {
266: $dbh->disconnect or
267: &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
268: exit;
269: }
1.1 harris41 270:
1.2 harris41 271: # -------------------------------------------------- Non-critical communication
1.1 harris41 272:
1.2 harris41 273: sub subreply {
274: my ($cmd,$server)=@_;
275: my $peerfile="$perlvar{'lonSockDir'}/$server";
276: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
277: Type => SOCK_STREAM,
278: Timeout => 10)
279: or return "con_lost";
280: print $sclient "$cmd\n";
281: my $answer=<$sclient>;
282: chomp($answer);
283: if (!$answer) { $answer="con_lost"; }
284: return $answer;
285: }
1.1 harris41 286:
1.2 harris41 287: sub reply {
288: my ($cmd,$server)=@_;
289: my $answer;
290: if ($server ne $perlvar{'lonHostID'}) {
291: $answer=subreply($cmd,$server);
292: if ($answer eq 'con_lost') {
293: $answer=subreply("ping",$server);
294: $answer=subreply($cmd,$server);
295: }
296: } else {
297: $answer='self_reply';
298: }
299: return $answer;
300: }
1.1 harris41 301:
1.3 harris41 302: # -------------------------------------------------------- Escape Special Chars
303:
304: sub escape {
305: my $str=shift;
306: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
307: return $str;
308: }
309:
310: # ----------------------------------------------------- Un-Escape Special Chars
311:
312: sub unescape {
313: my $str=shift;
314: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
315: return $str;
316: }
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