| 1 | #!/usr/bin/perl
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| 2 |
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| 3 | use strict;
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| 4 | use warnings;
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| 5 |
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| 6 | # Setup Environment
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| 7 | BEGIN
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| 8 | {
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| 9 | die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
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| 10 | die "GSDLOS not set\n" unless defined $ENV{'GSDLOS'};
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| 11 |
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| 12 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
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| 13 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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| 14 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan/XML/XPath");
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| 15 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/plugins");
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| 16 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/classify");
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| 17 |
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| 18 | if (defined $ENV{'GSDLEXTS'})
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| 19 | {
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| 20 | my @extensions = split(/:/,$ENV{'GSDLEXTS'});
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| 21 | foreach my $e (@extensions)
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| 22 | {
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| 23 | my $ext_prefix = "$ENV{'GSDLHOME'}/ext/$e";
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| 24 | unshift (@INC, "$ext_prefix/perllib");
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| 25 | unshift (@INC, "$ext_prefix/perllib/cpan");
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| 26 | unshift (@INC, "$ext_prefix/perllib/plugins");
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| 27 | unshift (@INC, "$ext_prefix/perllib/classify");
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| 28 | }
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| 29 | }
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| 30 | if (defined $ENV{'GSDL3EXTS'})
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| 31 | {
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| 32 | my @extensions = split(/:/,$ENV{'GSDL3EXTS'});
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| 33 | foreach my $e (@extensions)
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| 34 | {
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| 35 | my $ext_prefix = "$ENV{'GSDL3SRCHOME'}/ext/$e";
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| 36 | unshift (@INC, "$ext_prefix/perllib");
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| 37 | unshift (@INC, "$ext_prefix/perllib/cpan");
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| 38 | unshift (@INC, "$ext_prefix/perllib/plugins");
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| 39 | unshift (@INC, "$ext_prefix/perllib/classify");
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| 40 | }
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| 41 | }
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| 42 |
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| 43 | # Manually installed CPAN package in GEXT*INSTALL
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| 44 | unshift (@INC, $ENV{'GEXTTDBEDIT_INSTALLED'} . "/share/perl/5.12.4");
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| 45 | }
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| 46 |
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| 47 | use Cwd;
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| 48 |
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| 49 | # We need to do a little file locking
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| 50 | use Fcntl qw(:flock); #import LOCK_* constants
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| 51 |
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| 52 | # Advanced child process control allowing bidirectional pipes
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| 53 | use IPC::Run qw(harness start pump finish);
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| 54 |
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| 55 | # we need to run as a daemon
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| 56 | use Proc::Daemon;
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| 57 |
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| 58 | # The server will need to accept requests from multiple threads, and
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| 59 | # so will need threads in and of itself
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| 60 | use threads;
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| 61 | use threads::shared;
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| 62 |
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| 63 | # Greenstone utility functions (filename_cat)
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| 64 | use util;
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| 65 |
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| 66 | # A simple server that listens on a socket and 'forks' off child threads to
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| 67 | # handle each incoming request
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| 68 | use SocketsSwimmingThreadPoolServer;
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| 69 |
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| 70 | # Globally available - but once set these are read-only - so locking isn't
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| 71 | # an issue
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| 72 | my $tdbexe = 'tdbcli';
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| 73 | my $parent_pid = 0;
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| 74 | my $collection = '';
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| 75 | my $no_daemon = 0;
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| 76 | my $debug = 0;
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| 77 | my $server;
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| 78 | my $server_host;
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| 79 | my $server_port;
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| 80 | my $server_threads;
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| 81 | # - shared and, more importantly, lockable
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| 82 | my %listeners :shared;
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| 83 | my $should_stop :shared = 0;
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| 84 | my $debug_log :shared = 0;
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| 85 |
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| 86 | print "===== TDB Server =====\n";
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| 87 | print "Provides a server to allow multiple remote machines to simultaenously\n";
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| 88 | print "edit one or more TDB databases on the local machine. This is to work\n";
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| 89 | print "around NFS file locking issues when parallel processing on a cluster.\n";
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| 90 |
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| 91 | MAIN:
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| 92 | {
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| 93 | # Check arguments
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| 94 | # - compulsory
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| 95 | if (!defined $ARGV[0] || $ARGV[0] !~ /^\d+$/)
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| 96 | {
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| 97 | &printUsageAndExit('Error! Missing parent process ID or not a PID');
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| 98 | }
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| 99 | $parent_pid = $ARGV[0];
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| 100 | if (!defined $ARGV[1])
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| 101 | {
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| 102 | &printUsageAndExit('Error! Missing active Greenstone collection name');
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| 103 | }
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| 104 | $collection = $ARGV[1];
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| 105 | # - optional
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| 106 | my $i = 2;
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| 107 | while (defined $ARGV[$i])
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| 108 | {
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| 109 | if ($ARGV[$i] eq "-nodaemon")
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| 110 | {
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| 111 | $no_daemon = 1;
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| 112 | }
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| 113 | if ($ARGV[$i] eq "-debug")
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| 114 | {
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| 115 | $debug = 1;
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| 116 | }
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| 117 | $i++;
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| 118 | }
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| 119 |
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| 120 | # Read in the collection specific configuration
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| 121 | my $cfg_path = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'tdbserver.conf');
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| 122 | open(CFGIN, '<' . $cfg_path) or die("Failed to read config file: " . $cfg_path);
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| 123 | my $line = '';
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| 124 | while (($line = <CFGIN>))
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| 125 | {
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| 126 | if ($line =~ /^(\w+)\s+(.*)$/)
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| 127 | {
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| 128 | my $key = $1;
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| 129 | my $value = $2;
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| 130 | if ($key eq "serverhost")
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| 131 | {
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| 132 | $server_host = $value;
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| 133 | }
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| 134 | if ($key eq "serverport")
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| 135 | {
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| 136 | $server_port = $value;
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| 137 | }
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| 138 | if ($key eq "threads")
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| 139 | {
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| 140 | $server_threads = $value;
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| 141 | }
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| 142 | }
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| 143 | }
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| 144 | close(CFGIN);
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| 145 |
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| 146 | if ($debug)
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| 147 | {
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| 148 | print " - collection: " . $collection . "\n";
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| 149 | print " - parent pid: " . $parent_pid . "\n";
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| 150 | print " - no daemon? " . $no_daemon . "\n";
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| 151 | print " - debug? " . $debug . "\n";
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| 152 | print " - serverhost: " . $server_host . "\n";
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| 153 | print " - serverport: " . $server_port . "\n";
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| 154 | print " - threads: " . $server_threads . "\n";
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| 155 | print "\n";
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| 156 | }
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| 157 |
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| 158 | # Information about any running TDBServer is stored in a lockfile in
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| 159 | # Greenstone's tmp directory (named after the active collection)
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| 160 | my $tmp_dir = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'tmp');
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| 161 | if (!-d $tmp_dir)
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| 162 | {
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| 163 | mkdir($tmp_dir, 0755);
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| 164 | }
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| 165 | my $server_lockfile_path = &util::filename_cat($tmp_dir, 'tdbserver.lock');
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| 166 |
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| 167 | # If already running, then exit
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| 168 | print " * Testing if TDBServer for this collection already running... ";
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| 169 | if (-e $server_lockfile_path)
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| 170 | {
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| 171 | print "Error! TDBServer already running!\n";
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| 172 | print "Lockfile found at: " . $server_lockfile_path . "\n";
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| 173 | exit(0);
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| 174 | }
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| 175 | print "All clear!\n";
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| 176 |
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| 177 | # Ensure we can see tdb edit tools on the path
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| 178 | print " * Testing for tool: " . $tdbexe . "... ";
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| 179 | my $result = `$tdbexe 2>&1`;
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| 180 | if ($result !~ /usage:\s+$tdbexe/)
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| 181 | {
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| 182 | print "Error! " . $tdbexe . " not available - check path.\n";
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| 183 | exit(0);
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| 184 | }
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| 185 | print "Found!\n";
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| 186 |
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| 187 | # Daemonize
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| 188 | my $pid = 0;
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| 189 | if (!$no_daemon)
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| 190 | {
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| 191 | print " * Spawning Daemon...\n" unless (!$debug);
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| 192 | my $logs_dir = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'logs');
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| 193 | if (!-d $logs_dir)
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| 194 | {
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| 195 | mkdir($logs_dir, 0755);
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| 196 | }
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| 197 | my $daemon_out_path = &util::filename_cat($logs_dir, 'tdbserver.out');
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| 198 | my $daemon_err_path = &util::filename_cat($logs_dir, 'tdbserver.err');
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| 199 | $pid = Proc::Daemon::Init( { work_dir => getcwd(),
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| 200 | child_STDOUT => $daemon_out_path,
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| 201 | child_STDERR => $daemon_err_path,
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| 202 | } );
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| 203 | }
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| 204 |
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| 205 | # Master process has pid > 0
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| 206 | if ($pid == 0)
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| 207 | {
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| 208 | # - create server object
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| 209 | print " * Creating pool of " . $server_threads . " threads listening on socket: " . $server_host . ":" . $server_port . "\n";
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| 210 | $server = SocketsSwimmingThreadPoolServer->new(host=>$server_host,
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| 211 | port=>$server_port,
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| 212 | thread_count=>$server_threads,
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| 213 | # main_cb => \&exitCheck,
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| 214 | processor_cb => \&process);
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| 215 |
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| 216 | # - write a lockfile
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| 217 | print " * Creating lock file: " . $server_lockfile_path . "\n";
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| 218 | open(SLFH, ">", $server_lockfile_path) or die("Error! Failed to open file for writing: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 219 | flock(SLFH, LOCK_EX) or die("Error! Cannot lock file for writing: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 220 | print SLFH $server_host . ':' . $server_port;
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| 221 | flock(SLFH, LOCK_UN);
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| 222 | close(SLFH);
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| 223 |
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| 224 | # Perform main loop
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| 225 | # - loop is actually in Server code. start() only returns once server's stop
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| 226 | # command has been called
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| 227 | print " * Listening:\n";
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| 228 | $server->start;
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| 229 | print " * Stopping...\n";
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| 230 |
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| 231 | # Perform deinitializes here
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| 232 | # - remove server lockfile
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| 233 | print " * Removing lock file...\n";
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| 234 | unlink($server_lockfile_path);
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| 235 | print "Done!\n";
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| 236 | }
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| 237 | # Forked child processes
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| 238 | else
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| 239 | {
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| 240 | print " * Waiting for lockfile to be created";
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| 241 | while (!-e $server_lockfile_path)
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| 242 | {
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| 243 | print '.';
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| 244 | sleep(1);
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| 245 | }
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| 246 | print "\n * TDBServer lockfile created.\n";
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| 247 | open(SLFH, "<", $server_lockfile_path) or die("Error! Failed to open file for reading: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 248 | flock(SLFH, LOCK_SH) or die("Error! Cannot lock file for reading: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 249 | my $line = <SLFH>;
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| 250 | if ($line =~ /(^.+):(\d+)$/)
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| 251 | {
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| 252 | print " => Server now listening on " . $1 . ":" . $2 . "\n";
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| 253 | }
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| 254 | else
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| 255 | {
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| 256 | die ("Error! Failed to retrieve host and port information from lockfile!");
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| 257 | }
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| 258 | flock(SLFH, LOCK_UN);
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| 259 | close(SLFH);
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| 260 | }
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| 261 |
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| 262 | print "===== Complete! =====\n";
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| 263 | }
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| 264 | exit(0);
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| 265 |
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| 266 | # @function exitCheck
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| 267 | # A callback function, called every 5 seconds (default) by the socket server,
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| 268 | # to see whether the parent process (by pid) is actually still running. This
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| 269 | # will cover the case where the parent process (import.pl or build.pl) dies
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| 270 | # without properly asking the server to shutdown.
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| 271 | sub exitCheck
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| 272 | {
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| 273 | my $counter = shift @_;
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| 274 | print "[DEBUG] Has parent process gone away? [" . $parent_pid . "]\n";
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| 275 | # Parent PID not available or we aren't allowed to talk to it (debugging)
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| 276 | if ($parent_pid == 0)
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| 277 | {
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| 278 | return;
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| 279 | }
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| 280 | # note: kill, when passed a first argument of 0, checks whether it's possible
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| 281 | # to send a signal to the pid given as the second argument, and returns true
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| 282 | # if it is. Thus it provides a means to determine if the parent process is
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| 283 | # still running (and hence can be signalled) In newer versions of Perl
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| 284 | # (5.8.9) it should even work cross-platform.
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| 285 | if (!kill(0, $parent_pid))
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| 286 | {
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| 287 | print " * Parent processs gone away... forcing server shutdown\n";
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| 288 | $server->stop;
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| 289 | if ($debug)
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| 290 | {
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| 291 | lock($debug_log);
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| 292 | $|++;
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| 293 | print "[" . time() . "|MAIN] Parent process gone away... forcing server shutdown.\n\n";
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| 294 | $|--;
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| 295 | }
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| 296 | }
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| 297 | }
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| 298 |
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| 299 | # /** @function process
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| 300 | # * A horribly named function that is called back to process each of the
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| 301 | # * requests to alter the TDB databases. It expects a complete TDB CLI
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| 302 | # * command as a text blob, or one of a limited number of special commands
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| 303 | # * ([a]dd or [r]emove listener, or [q]uit).
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| 304 | # */
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| 305 | sub process
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| 306 | {
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| 307 | my $data = shift @_;
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| 308 | my $ip = shift @_;
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| 309 | my $tid = shift @_;
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| 310 | my $result = "#ERROR#";
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| 311 | # Synchronized debug log writing
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| 312 | if ($debug)
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| 313 | {
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| 314 | lock($debug_log);
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| 315 | $|++;
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| 316 | print "[" . time() . "|" . $tid . "|RECV] " . $data . "\n";
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| 317 | $|--;
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| 318 | }
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| 319 | # process special commands first
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| 320 | if ($data =~ /^#([arq]):(.*)$/)
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| 321 | {
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| 322 | my $command = $1;
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| 323 | my $argument = $2;
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| 324 | # addlistener(<pid>)
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| 325 | if ($command eq "a")
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| 326 | {
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| 327 | lock(%listeners);
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| 328 | $listeners{$argument} = 1;
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| 329 | my $listener_count = scalar(keys(%listeners));
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| 330 | $result = "[SUCCESS] added listener [" . $listener_count . " listeners]";
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| 331 | # //unlock(%listeners)
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| 332 | }
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| 333 | # removelistener(<pid>)
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| 334 | elsif ($command eq "r")
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| 335 | {
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| 336 | my $listener_count = 0;
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| 337 | {
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| 338 | lock(%listeners);
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| 339 | if (defined $listeners{$argument})
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| 340 | {
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| 341 | delete $listeners{$argument};
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| 342 | }
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| 343 | $listener_count = scalar(keys(%listeners));
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| 344 | # //unlock(%listeners)
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| 345 | }
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| 346 | lock($should_stop);
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| 347 | if ($should_stop == 1 && $listener_count == 0)
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| 348 | {
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| 349 | # server isn't shared, but the stop data member is!
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| 350 | $server->stop;
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| 351 | $result = "[SUCCESS] removed last listener, stopping";
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| 352 | }
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| 353 | else
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| 354 | {
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| 355 | $result = "[SUCCESS] removed listener [" . $listener_count . " listeners]";
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| 356 | }
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| 357 | # //unlock($should_stop)
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| 358 | }
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| 359 | # we may be asked to stop the server, but only by the process that created
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| 360 | # us. If there are no listeners registered, we stop straight away,
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| 361 | # otherwise we set a flag so that as soon as there are no listeners we
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| 362 | # stop.
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| 363 | elsif ($command eq "q")
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| 364 | {
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| 365 | if ($argument ne $parent_pid && $argument ne "*")
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| 366 | {
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| 367 | $result = "[IGNORED] can only be stopped by parent process";
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| 368 | }
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| 369 | else
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| 370 | {
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| 371 | my $listener_count = 0;
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| 372 | {
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| 373 | lock(%listeners);
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| 374 | $listener_count = scalar(keys(%listeners));
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| 375 | # //unlock(%listeners)
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| 376 | }
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| 377 | if ($listener_count == 0)
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| 378 | {
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| 379 | # server isn't shared, but the stop data member is!
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| 380 | $server->stop;
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| 381 | $result = "[SUCCESS] stopping";
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| 382 | }
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| 383 | else
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| 384 | {
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| 385 | lock($should_stop);
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| 386 | $should_stop = 1;
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| 387 | $result = "[PENDING] will stop when no more listeners";
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| 388 | # //unlock($should_stop)
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| 389 | }
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| 390 | }
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| 391 | }
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| 392 | }
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| 393 | # Everything thing else should be a TDB command
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| 394 | # form <database>:<key>:<value>
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| 395 | # where: database is [d]oc, [i]ndex, or [s]rc
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| 396 | elsif ($data =~ /^([dis]):(.+)$/s)
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| 397 | {
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| 398 | my $database = $1;
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| 399 | my $record = $2;
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| 400 | # Build path to database file
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| 401 | my $tdb_path = '';
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| 402 | if ($database eq 'd')
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| 403 | {
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| 404 | $tdb_path = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'archives', 'archiveinf-doc.tdb');
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| 405 | }
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| 406 | elsif ($database eq 's')
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| 407 | {
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| 408 | $tdb_path = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'archives', 'archiveinf-src.tdb');
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| 409 | }
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| 410 | else
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| 411 | {
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| 412 | $tdb_path = &util::filename_cat($ENV{'GSDLHOME'}, 'collect', $collection, 'building', 'text', $collection . '.tdb');
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| 413 | }
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| 414 | # Open harness to TDBCLI
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| 415 | my @tdb_command = ($tdbexe, $tdb_path);
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| 416 | my $buffer_to_tdb = '';
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| 417 | my $buffer_from_tdb = '';
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| 418 | my $tdb_harness = start(\@tdb_command, \$buffer_to_tdb, \$buffer_from_tdb);
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| 419 | # Check the harness worked
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| 420 | if (!pumpable $tdb_harness)
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| 421 | {
|
|---|
| 422 | die("Error! Harness to " . $tdbexe . " has gone away!");
|
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| 423 | }
|
|---|
| 424 | # - write the data to the TDBCLI
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|---|
| 425 | $buffer_to_tdb = $record . "\n";
|
|---|
| 426 | pump($tdb_harness) while (length($buffer_to_tdb));
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|---|
| 427 | # - read any response from TDBCLI
|
|---|
| 428 | pump($tdb_harness) until ($buffer_from_tdb =~ /-{70}/);
|
|---|
| 429 | # - not that this result doesn't include the [Server] prefix as it
|
|---|
| 430 | # may be parsed for data by the client
|
|---|
| 431 | $result = $buffer_from_tdb;
|
|---|
| 432 | chomp($result);
|
|---|
| 433 | # Finished with harness
|
|---|
| 434 | finish($tdb_harness);
|
|---|
| 435 | }
|
|---|
| 436 | # Synchronized debug log writing
|
|---|
| 437 | if ($debug)
|
|---|
| 438 | {
|
|---|
| 439 | lock($debug_log);
|
|---|
| 440 | $|++;
|
|---|
| 441 | print "[" . time() . "|" . $tid . "|SEND] " . $result . "\n\n";
|
|---|
| 442 | $|--;
|
|---|
| 443 | # //unlock($debug_log);
|
|---|
| 444 | }
|
|---|
| 445 | return $result;
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | sub printUsageAndExit
|
|---|
| 449 | {
|
|---|
| 450 | my ($msg) = @_;
|
|---|
| 451 | print "$msg\n\n";
|
|---|
| 452 | print "Usage: TDBServer.pl <parent_pid> <collectionname> [-nodaemon] [-debug]\n\n";
|
|---|
| 453 | exit(0);
|
|---|
| 454 | }
|
|---|
| 455 |
|
|---|
| 456 | 1;
|
|---|
