version 1.1, 2005/09/26 19:00:29
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version 1.3, 2005/11/17 22:34:49
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#!/usr/bin/perl |
#!/usr/bin/perl |
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# The LearningOnline Network |
# The LearningOnline Network |
# lonsql - LON TCP-MySQL-Server Daemon for handling database requests. |
# lonsql - LON TCP-NSDL Query Handler. |
# |
# |
# $Id$ |
# $Id$ |
# |
# |
Line 113 use IO::File;
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Line 113 use IO::File;
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use Socket; |
use Socket; |
use Fcntl; |
use Fcntl; |
use Tie::RefHash; |
use Tie::RefHash; |
use DBI; |
use HTML::LCParser(); |
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use LWP::UserAgent(); |
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use HTTP::Headers; |
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use HTTP::Date; |
use File::Find; |
use File::Find; |
use localenroll; |
use localenroll; |
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######################################################## |
######################################################## |
######################################################## |
######################################################## |
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=pod |
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=item Global Variables |
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=over 4 |
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=item dbh |
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=back |
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=cut |
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######################################################## |
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######################################################## |
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my $dbh; |
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######################################################## |
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######################################################## |
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=pod |
=pod |
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=item Variables required for forking |
=item Variables required for forking |
Line 223 ENDMYCNF
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Line 207 ENDMYCNF
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# |
# |
# Make sure that database can be accessed |
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# |
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my $dbh; |
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unless ($dbh = DBI->connect("DBI:mysql:loncapa","www", |
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$perlvar{'lonSqlAccess'}, |
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{ RaiseError =>0,PrintError=>0})) { |
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print "Cannot connect to database!\n"; |
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my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; |
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my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!"; |
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system("echo 'Cannot connect to MySQL database!' |". |
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" mailto $emailto -s '$subj' > /dev/null"); |
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open(SMP,'>/home/httpd/html/lon-status/mysql.txt'); |
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print SMP 'time='.time.'&mysql=defunct'."\n"; |
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close(SMP); |
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exit 1; |
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} else { |
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unlink('/home/httpd/html/lon-status/mysql.txt'); |
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$dbh->disconnect; |
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} |
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# |
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# Check if other instance running |
# Check if other instance running |
# |
# |
my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid"; |
my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid"; |
Line 364 sub make_new_child {
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Line 325 sub make_new_child {
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# unblock signals |
# unblock signals |
sigprocmask(SIG_UNBLOCK, $sigset) |
sigprocmask(SIG_UNBLOCK, $sigset) |
or die "Can't unblock SIGINT for fork: $!\n"; |
or die "Can't unblock SIGINT for fork: $!\n"; |
#open database handle |
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# making dbh global to avoid garbage collector |
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unless ($dbh = DBI->connect("DBI:mysql:loncapa","www", |
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$perlvar{'lonSqlAccess'}, |
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{ RaiseError =>0,PrintError=>0})) { |
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sleep(10+int(rand(20))); |
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&logthis("<font color='blue'>WARNING: Couldn't connect to database". |
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": $@</font>"); |
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# "($st secs): $@</font>"); |
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print "database handle error\n"; |
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exit; |
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} |
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# make sure that a database disconnection occurs with |
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# ending kill signals |
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$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT; |
$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT; |
# handle connections until we've reached $MAX_CLIENTS_PER_CHILD |
# handle connections until we've reached $MAX_CLIENTS_PER_CHILD |
for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) { |
for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) { |
Line 431 sub make_new_child {
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Line 379 sub make_new_child {
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my $locresult = ''; |
my $locresult = ''; |
my $querystr = &unescape($arg3); |
my $querystr = &unescape($arg3); |
foreach (split/%%/,$querystr) { |
foreach (split/%%/,$querystr) { |
if (/^(\w+)=([^=]+)$/) { |
if (/^([^=]+)=([^=]+)$/) { |
@{$affiliates{$1}} = split/,/,$2; |
@{$affiliates{$1}} = split/,/,$2; |
} |
} |
} |
} |
Line 465 sub make_new_child {
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Line 413 sub make_new_child {
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} |
} |
# tidy up gracefully and finish |
# tidy up gracefully and finish |
# |
# |
# close the database handle |
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$dbh->disconnect |
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or &logthis("<font color='blue'>WARNING: Couldn't disconnect". |
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" from database $DBI::errstr : $@</font>"); |
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# this exit is VERY important, otherwise the child will become |
# this exit is VERY important, otherwise the child will become |
# a producer of more and more children, forking yourself into |
# a producer of more and more children, forking yourself into |
# process death. |
# process death. |
Line 507 sub process_file {
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Line 452 sub process_file {
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} |
} |
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sub do_sql_query { |
sub do_sql_query { |
my ($query,$custom,$customshow) = @_; |
my ($query) = @_; |
&logthis('doing query '.$query); |
&logthis('doing query '.$query); |
$custom = &unescape($custom); |
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$customshow = &unescape($customshow); |
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# |
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@metalist = (); |
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# |
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my $result = ''; |
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my @results = (); |
my @results = (); |
my @files; |
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my $subsetflag=0; |
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# |
# |
if ($query) { |
if ($query) { |
#prepare and execute the query |
#prepare and execute the query |
my $sth = $dbh->prepare($query); |
my $aref=&nsdl_query($query); |
unless ($sth->execute()) { |
foreach my $row (@$aref) { |
&logthis('<font color="blue">'. |
my @b=map { &escape($_); } @$row; |
'WARNING: Could not retrieve from database:'. |
push @results,join(",", @b); |
$sth->errstr().'</font>'); |
} |
} else { |
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my $aref=$sth->fetchall_arrayref; |
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foreach my $row (@$aref) { |
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push @files,@{$row}[3] if ($custom or $customshow); |
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my @b=map { &escape($_); } @$row; |
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push @results,join(",", @b); |
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# Build up the @files array with the LON-CAPA urls |
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# of the resources. |
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} |
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} |
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} |
} |
# do custom metadata searching here and build into result |
return join("&",@results); |
return join("&",@results) if (! ($custom or $customshow)); |
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# Only get here if there is a custom query or custom show request |
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&logthis("Doing custom query for $custom"); |
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if ($query) { |
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@metalist=map { |
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$perlvar{'lonDocRoot'}.$_.'.meta'; |
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} @files; |
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} else { |
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my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}"; |
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@metalist=(); |
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opendir(RESOURCES,$dir); |
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my @homeusers=grep { |
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&ishome($dir.'/'.$_); |
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} grep {!/^\.\.?$/} readdir(RESOURCES); |
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closedir RESOURCES; |
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# Define the |
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foreach my $user (@homeusers) { |
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find (\&process_file,$dir.'/'.$user); |
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} |
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} |
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# if file is indicated in sql database and |
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# not part of sql-relevant query, do not pattern match. |
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# |
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# if file is not in sql database, output error. |
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# |
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# if file is indicated in sql database and is |
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# part of query result list, then do the pattern match. |
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my $customresult=''; |
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my @results; |
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foreach my $metafile (@metalist) { |
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my $fh=IO::File->new($metafile); |
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my @lines=<$fh>; |
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my $stuff=join('',@lines); |
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if ($stuff=~/$custom/s) { |
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foreach my $f ('abstract','author','copyright', |
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'creationdate','keywords','language', |
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'lastrevisiondate','mime','notes', |
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'owner','subject','title') { |
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$stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s; |
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} |
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my $mfile=$metafile; |
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my $docroot=$perlvar{'lonDocRoot'}; |
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$mfile=~s/^$docroot//; |
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$mfile=~s/\.meta$//; |
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unless ($query) { |
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my $q2="SELECT * FROM metadata WHERE url ". |
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" LIKE BINARY '?'"; |
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my $sth = $dbh->prepare($q2); |
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$sth->execute($mfile); |
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my $aref=$sth->fetchall_arrayref; |
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foreach my $a (@$aref) { |
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my @b=map { &escape($_)} @$a; |
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push @results,join(",", @b); |
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} |
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} |
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# &logthis("found: $stuff"); |
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$customresult.='&custom='.&escape($mfile).','. |
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escape($stuff); |
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} |
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} |
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$result=join("&",@results) unless $query; |
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$result.=$customresult; |
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# |
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return $result; |
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} # End of &do_sql_query |
} # End of &do_sql_query |
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} # End of scoping curly braces for &process_file and &do_sql_query |
} # End of scoping curly braces for &process_file and &do_sql_query |
Line 976 sub HUPSMAN { # sig
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Line 842 sub HUPSMAN { # sig
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exec("$execdir/lonsql"); # here we go again |
exec("$execdir/lonsql"); # here we go again |
} |
} |
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sub DISCONNECT { |
# |
$dbh->disconnect or |
# Takes SQL query |
&logthis("<font color='blue'>WARNING: Couldn't disconnect from database ". |
# sends it to NSDL |
" $DBI::errstr : $@</font>"); |
# has to return array reference |
exit; |
# |
} |
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sub nsdl_query { |
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my $query=shift; |
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my ($keyword)=($query=~/\"\%([^\%]+)\%\"/); |
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$keyword=&escape($keyword); |
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&logthis('Doing '.$keyword); |
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my $url='http://search.nsdl.org?verb=Search&s=0&n=500&q='.$keyword; |
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my $ua=new LWP::UserAgent; |
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my $response=$ua->get($url); |
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return []; |
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} |
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=pod |
=pod |
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