[25410] | 1 | ###########################################################################
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| 2 | #
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| 3 | # dbutil::tdbserver -- utility functions for writing to tdb databases but
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| 4 | # implemented as a server with a single, persistent
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| 5 | # connection
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| 6 | #
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| 7 | # A component of the Greenstone digital library software
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| 8 | # from the New Zealand Digital Library Project at the
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| 9 | # University of Waikato, New Zealand.
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| 10 | #
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| 11 | # Copyright (C) 2012
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| 12 | #
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| 13 | # This program is free software; you can redistribute it and/or modify
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| 14 | # it under the terms of the GNU General Public License as published by
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| 15 | # the Free Software Foundation; either version 2 of the License, or
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| 16 | # (at your option) any later version.
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| 17 | #
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| 18 | # This program is distributed in the hope that it will be useful,
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| 19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 21 | # GNU General Public License for more details.
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| 22 | #
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| 23 | # You should have received a copy of the GNU General Public License
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| 24 | # along with this program; if not, write to the Free Software
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| 25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 26 | #
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| 27 | ###########################################################################
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| 28 |
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| 29 | package dbutil::tdbserver;
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| 30 |
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| 31 | use strict;
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| 32 | use warnings;
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| 33 |
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| 34 | # We're going to have to delve into locking (a little) to prevent multiple
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| 35 | # threads trying to launch the server at once
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| 36 | use Fcntl qw(:flock);
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| 37 |
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| 38 | use TDBClient;
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| 39 | use util;
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| 40 |
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| 41 | my $hyphen70 = '-' x 70;
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| 42 | my $debug = 0;
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| 43 |
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| 44 | # We have a global reference to all of the TDB Server lockfiles that this
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| 45 | # instance has created (as we'll be responsible for closing them)
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| 46 | my %created_server_lockfile_paths;
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| 47 | # Keep track of the lockfiles for server we have added ourselves as listeners
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| 48 | # to.
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| 49 | my %listener_server_lockfile_paths;
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| 50 | # We also have a global of all of the listeners we have assigned as we'll
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| 51 | # be responsible for removing them.
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| 52 | my %registered_listeners;
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| 53 |
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| 54 | sub _spawnClient
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| 55 | {
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| 56 | my ($infodb_file_path) = @_;
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| 57 | # 1. Check whether the server is already running by trying to locate the
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| 58 | # server 'lock' file.
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| 59 |
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| 60 | my ($collection) = $infodb_file_path =~ /collect[\\\/]([^\\\/]+)/i;
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| 61 | my ($infodb_file, $extension) = $infodb_file_path =~ /([^\\\/]+)\.(t?db)/i;
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| 62 |
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| 63 | my $tmp_dir = &util::filename_cat($ENV{'GSDLHOME'},'tmp');
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| 64 | if (!-d $tmp_dir)
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| 65 | {
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| 66 | mkdir($tmp_dir, 0755);
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| 67 | }
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| 68 |
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[27399] | 69 | my $we_started_server = 0;
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[25410] | 70 | my $server_lockfile_path = &util::filename_cat($ENV{'GSDLHOME'},'collect',$collection,'tmp','tdbserver.lock');
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[26994] | 71 | print " * Searching for TDBServer lockfile...\n";
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[25410] | 72 | if (!-e $server_lockfile_path)
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| 73 | {
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[26994] | 74 | print "Not found.\n";
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[26085] | 75 | # We need to lock here to ensure only one thread enters the following code,
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| 76 | # sees a missing TDBServer, and launches it
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| 77 | my $tmp_lockfile_path = &util::filename_cat($ENV{'GSDLHOME'},'tmp','dbutil-tdbserver.lock');
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| 78 | open(TMPFH, '>', $tmp_lockfile_path) or die("Warning! Failed to open file for writing: " . $tmp_lockfile_path . "\nReason: " . $! . "\n");
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| 79 | flock(TMPFH, LOCK_EX) or die("Error! Cannot lock file exclusively: " . $tmp_lockfile_path . "\nReason: " . $! . "\n");
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| 80 | print TMPFH localtime();
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| 81 | # - If the file still doesn't exist...
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| 82 | if (!-e $server_lockfile_path)
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[25410] | 83 | {
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[27399] | 84 | $we_started_server = 1;
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[26085] | 85 | # ...start it!
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| 86 | my $launch_cmd = 'TDBServer.pl "' . $$ . '" "' . $collection . '"';
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[26994] | 87 | print "* Starting TDBServer for: " . $collection . " [" . $launch_cmd . "]... ";
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[26085] | 88 | # @note I once had the below pipe ending with 2>&1 |, but that then blocks
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| 89 | # indefinitely when looping and reading <SERVERIN>.
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| 90 | open(SERVERIN, $launch_cmd . ' |') or die("Error! Failed to run launch command: " . $launch_cmd . "\nReason: " . $! . "\n");
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| 91 | # read all the output from the server
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| 92 | my $line = '';
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| 93 | my $server_lock_file_created = 0;
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[27399] | 94 | autoflush STDOUT 1;
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| 95 | print "* Waiting for TDBServer to start";
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[26994] | 96 | my $server_host = '';
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| 97 | my $server_port = '';
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[26085] | 98 | while ($line = <SERVERIN>)
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[25410] | 99 | {
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[27399] | 100 | print ".";
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[26085] | 101 | # - watch for the line indicating a lock file has been created and
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| 102 | # populated with a sexy port number
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[26994] | 103 | if ($line =~ /Server now listening on ([^:]+):(\d+)/)
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[25410] | 104 | {
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[26994] | 105 | $server_host = $1;
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| 106 | $server_port = $2;
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[26085] | 107 | $server_lock_file_created = 1;
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[25410] | 108 | }
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[26085] | 109 | # - we could also watch for errors here
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| 110 | if ($debug)
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| 111 | {
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| 112 | if ($line !~ /\n/)
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| 113 | {
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| 114 | $line .= "\n";
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| 115 | }
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| 116 | $|++; # autoflush
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| 117 | print "[tdbserver] $line";
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| 118 | $|--; # disable autoflush
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| 119 | }
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[25410] | 120 | }
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[26085] | 121 | close(SERVERIN);
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[27399] | 122 | print "\n";
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[26085] | 123 | if (!$server_lock_file_created)
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| 124 | {
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| 125 | die("Error! TDBServer failed to create lock file. Check server logs.");
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| 126 | }
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[26994] | 127 | else
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| 128 | {
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| 129 | print "Running on " . $server_host . ":" . $server_port . "\n";
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| 130 | }
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[26085] | 131 | # record this for later
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| 132 | $created_server_lockfile_paths{$server_lockfile_path} = 1;
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[25410] | 133 | }
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[26085] | 134 | flock(TMPFH, LOCK_UN);
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| 135 | close($tmp_lockfile_path);
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| 136 | unlink($tmp_lockfile_path);
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[25410] | 137 | }
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[26994] | 138 | else
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| 139 | {
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| 140 | print "Found!\n";
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| 141 | }
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[25410] | 142 | # record this for later
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| 143 | $listener_server_lockfile_paths{$server_lockfile_path} = $infodb_file_path;
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[27399] | 144 | return TDBClient->new($server_lockfile_path, $infodb_file, $we_started_server);
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[25410] | 145 | }
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| 146 |
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| 147 | END
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| 148 | {
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| 149 | # we ask the server to shutdown, but only the 'creator' thread will actually
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| 150 | # be able to, and only once all listeners have deregistered.
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| 151 | foreach my $server_lockfile_path (keys (%listener_server_lockfile_paths))
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| 152 | {
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| 153 | my $infodb_file_path = $listener_server_lockfile_paths{$server_lockfile_path};
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| 154 | my $tdb_client_handle = TDBClient->new($server_lockfile_path, '');
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| 155 | # Deregister all of our registered listeners
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| 156 | foreach my $listener_suffix (keys(%registered_listeners))
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| 157 | {
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| 158 | $tdb_client_handle->removeListener($listener_suffix);
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| 159 | }
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| 160 | # ask the servers we created to shut down (all other threads will have
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| 161 | # this request ignored)
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| 162 | if (defined $created_server_lockfile_paths{$infodb_file_path})
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| 163 | {
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| 164 | print "* Attempting to stop TDBServer for: " . $infodb_file_path . "\n";
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| 165 | }
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| 166 | $tdb_client_handle->stopServer();
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| 167 | }
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| 168 | # we should now wait until all of our server_lockfiles have actually been
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| 169 | # removed (otherwise people could mistakenly run import/build again
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[27399] | 170 | # immediately and things *might* go pearshaped). (Subsequent testing shows it
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| 171 | # won't - a new Greenstone build can't start until the previous lockfile is
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| 172 | # removed - but I think, for ATOMic sake, I may as well make waiting a part
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| 173 | # of the Greenstone import/build time.
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| 174 | my $wait_for_exit = 1;
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| 175 | foreach my $server_lockfile_path (keys (%created_server_lockfile_paths))
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| 176 | {
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| 177 | if ($wait_for_exit)
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| 178 | {
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| 179 | # While the file exists, we should wait
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| 180 | autoflush STDOUT 1;
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| 181 | print "* Waiting for TDBServer to exit [" . $server_lockfile_path . "]";
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| 182 | if (-e $server_lockfile_path)
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| 183 | {
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| 184 | while (-e $server_lockfile_path)
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| 185 | {
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| 186 | print ".";
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| 187 | sleep(1);
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| 188 | }
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| 189 | }
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| 190 | }
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| 191 | else
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| 192 | {
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| 193 | print "* NOT Waiting for TDBServer to exit... ";
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| 194 | }
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| 195 | print " Done!\n";
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| 196 | }
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[25410] | 197 | }
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| 198 |
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| 199 | # -----------------------------------------------------------------------------
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| 200 | # TDB SERVER IMPLEMENTATION
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| 201 | # -----------------------------------------------------------------------------
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| 202 | sub open_infodb_write_handle
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| 203 | {
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| 204 | my $infodb_file_path = shift(@_);
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| 205 | my $opt_append = shift(@_);
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| 206 | if (defined $opt_append && $opt_append ne "append")
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| 207 | {
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| 208 | print "Warning! Modes other than 'append' not supported for TDBServer.\n";
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| 209 | }
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| 210 | my $tdb_client_handle = &_spawnClient($infodb_file_path);
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| 211 | # Register this client on the server if necessary
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| 212 | $tdb_client_handle->addListener('w');
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| 213 | $registered_listeners{'w'} = 1;
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| 214 | # and pass the handle to client around
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| 215 | return $tdb_client_handle;
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| 216 | }
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| 217 |
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| 218 | # /** Destructor or near enough.
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| 219 | # /*
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| 220 | sub close_infodb_write_handle
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| 221 | {
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| 222 | my $tdb_client_handle = shift(@_);
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| 223 | # @todo Is there meant to be something here?
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| 224 | }
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| 225 | # /** close_infodb_write_handle($infodb_handle) **/
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| 226 |
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| 227 | # /** @function get_info_db_file_path
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| 228 | # * Exactly the same as vanilla TDB - as we are still using a TDB database
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| 229 | # * just accessing it via a persistant server
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| 230 | # */
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| 231 | sub get_infodb_file_path
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| 232 | {
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| 233 | my $collection_name = shift(@_);
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| 234 | my $infodb_directory_path = shift(@_);
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| 235 | my $create_server = shift(@_);
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| 236 |
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| 237 | my $infodb_file_extension = ".tdb";
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| 238 | my $infodb_file_name = &util::get_dirsep_tail($collection_name) . $infodb_file_extension;
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| 239 | my $infodb_file_path = &util::filename_cat($infodb_directory_path, $infodb_file_name);
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| 240 |
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| 241 | # Special Case for TDBServer
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| 242 | if (defined $create_server && $create_server == 1)
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| 243 | {
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| 244 | my $tdb_client_handle = &_spawnClient($infodb_file_path);
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| 245 | # Register this client on the server if necessary
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| 246 | $tdb_client_handle->addListener('i');
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| 247 | $registered_listeners{'i'} = 1;
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| 248 | }
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| 249 |
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| 250 | # Resuming our regular programming
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| 251 | return $infodb_file_path;
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| 252 | }
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| 253 |
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| 254 | sub read_infodb_file
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| 255 | {
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| 256 | my $infodb_file_path = shift(@_);
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| 257 | my $infodb_map = shift(@_);
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| 258 |
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| 259 | my $tdb_client_handle = &_spawnClient($infodb_file_path);
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| 260 | $tdb_client_handle->addListener('r');
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| 261 | $registered_listeners{'r'} = 1;
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| 262 | # retrieves all the keys in the form:
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| 263 | # [key1]\n[key2]\n[key3]\n...[keyn]
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| 264 | my $raw_infodb_keys = $tdb_client_handle->query('[*]?');
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| 265 |
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| 266 | my @infodb_keys = split(/\r?\n/, $raw_infodb_keys);
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| 267 | foreach my $infodb_key (@infodb_keys)
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| 268 | {
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| 269 | if ($infodb_key =~ /.+/ && $infodb_key !~ /-{70}/)
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| 270 | {
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| 271 | # lookup each key
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| 272 | my $infodb_value = $tdb_client_handle->query('[' . $infodb_key . ']?');
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| 273 | # store it
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| 274 | $infodb_map->{$infodb_key} = $infodb_value;
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| 275 | }
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| 276 | }
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| 277 | }
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| 278 |
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| 279 | sub read_infodb_keys
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| 280 | {
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| 281 | my $infodb_file_path = shift(@_);
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| 282 | my $infodb_map = shift(@_);
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| 283 |
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| 284 | # spawn client (creating server as necessary)
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| 285 | my $tdb_client_handle = &_spawnClient($infodb_file_path);
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| 286 | # register ourself as listener
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| 287 | $tdb_client_handle->addListener('k');
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| 288 | $registered_listeners{'k'} = 1;
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| 289 | # retrieves all the keys in the form:
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| 290 | # [key1]\n[key2]\n[key3]\n...[keyn]
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| 291 | my $raw_infodb_keys = $tdb_client_handle->query('[*]?');
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| 292 | my @infodb_keys = split(/\r?\n/, $raw_infodb_keys);
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| 293 | foreach my $infodb_key (@infodb_keys)
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| 294 | {
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| 295 | if ($infodb_key =~ /.+/ && $infodb_key !~ /-{70}/)
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| 296 | {
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| 297 | $infodb_map->{$infodb_key} = 1;
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| 298 | }
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| 299 | }
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| 300 | }
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| 301 |
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| 302 | sub write_infodb_entry
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| 303 | {
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| 304 | my $tdb_client_handle = shift(@_);
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| 305 | my $infodb_key = shift(@_);
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| 306 | my $infodb_map = shift(@_);
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| 307 | # - build up the tdb command
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| 308 | my $tdb_command = "[" . $infodb_key . "]+\n";
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| 309 | foreach my $infodb_value_key (keys(%$infodb_map))
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| 310 | {
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| 311 | foreach my $infodb_value (@{$infodb_map->{$infodb_value_key}})
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| 312 | {
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| 313 | if ($infodb_value =~ /-{70,}/)
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| 314 | {
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| 315 | # if value contains 70 or more hyphens in a row we need to escape them
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| 316 | # to prevent txt2db from treating them as a separator
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| 317 | $infodb_value =~ s/-/&\#045;/gi;
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| 318 | }
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| 319 | $tdb_command .= "<" . $infodb_value_key . ">" . $infodb_value . "\n";
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| 320 | }
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| 321 | }
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| 322 | $tdb_command .= $hyphen70 . "\n";
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| 323 | # - ask the client to transmit the command to the server
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| 324 | $tdb_client_handle->query($tdb_command);
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| 325 | }
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| 326 |
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| 327 | sub write_infodb_rawentry
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| 328 | {
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| 329 | my $tdb_client_handle = shift(@_);
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| 330 | my $infodb_key = shift(@_);
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| 331 | my $infodb_val = shift(@_);
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| 332 | # - build up the tdb command
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| 333 | my $tdb_command = "[" . $infodb_key . "]\n";
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| 334 | $tdb_command .= $infodb_val . "\n";
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| 335 | $tdb_command .= $hyphen70 . "\n";
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| 336 | # - ask the client to transmit the command to the server
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| 337 | $tdb_client_handle->query($tdb_command);
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| 338 | return 1;
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| 339 | }
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| 340 |
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| 341 | sub set_infodb_entry
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| 342 | {
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| 343 | my $infodb_file_path = shift(@_);
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| 344 | my $infodb_key = shift(@_);
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| 345 | my $infodb_map = shift(@_);
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| 346 | # spawn client (creating server as necessary)
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| 347 | my $tdb_client_handle = &_spawnClient($infodb_file_path);
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| 348 | $tdb_client_handle->addListener('s');
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| 349 | $registered_listeners{'s'} = 1;
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| 350 | # Protect metadata values that go inside quotes for tdbset
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| 351 | foreach my $k (keys %$infodb_map)
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| 352 | {
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| 353 | my @escaped_v = ();
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| 354 | foreach my $v (@{$infodb_map->{$k}})
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| 355 | {
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| 356 | if ($k eq "contains")
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| 357 | {
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| 358 | # protect quotes in ".2;".3 etc
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| 359 | $v =~ s/\"/\\\"/g;
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| 360 | push(@escaped_v, $v);
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| 361 | }
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| 362 | else
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| 363 | {
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| 364 | my $ev = &ghtml::unescape_html($v);
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| 365 | $ev =~ s/\"/\\\"/g;
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| 366 | push(@escaped_v, $ev);
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| 367 | }
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| 368 | }
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| 369 | $infodb_map->{$k} = \@escaped_v;
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| 370 | }
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| 371 | # Generate the record string (TDB command)
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| 372 | my $tdb_command = "[" . $infodb_key . "]\n";
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| 373 | $tdb_command .= &dbutil::convert_infodb_hash_to_string($infodb_map) . "\n";
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| 374 | $tdb_command .= $hyphen70 . "\n";
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| 375 | # Send command to server
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| 376 | $tdb_client_handle->query($tdb_command);
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| 377 | }
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| 378 |
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| 379 | sub delete_infodb_entry
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| 380 | {
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| 381 | my $tdb_client_handle = shift(@_);
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| 382 | my $infodb_key = shift(@_);
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| 383 | # - create command
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| 384 | my $tdb_command = "[" . $infodb_key . "]-\n";
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| 385 | # - and send
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| 386 | $tdb_client_handle->query($tdb_command);
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| 387 | }
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| 388 |
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| 389 |
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| 390 |
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| 391 | 1;
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