| 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 | # Configuration
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| 7 | my $thread_count = 10;
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| 8 |
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| 9 | # Setup Environment
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| 10 | BEGIN
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| 11 | {
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| 12 | die "GSDLHOME not set\n" unless defined $ENV{'GSDLHOME'};
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| 13 | die "GSDLOS not set\n" unless defined $ENV{'GSDLOS'};
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| 14 |
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| 15 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib");
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| 16 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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| 17 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan/XML/XPath");
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| 18 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/plugins");
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| 19 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/classify");
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| 20 |
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| 21 | if (defined $ENV{'GSDLEXTS'})
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| 22 | {
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| 23 | my @extensions = split(/:/,$ENV{'GSDLEXTS'});
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| 24 | foreach my $e (@extensions)
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| 25 | {
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| 26 | my $ext_prefix = "$ENV{'GSDLHOME'}/ext/$e";
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| 27 | unshift (@INC, "$ext_prefix/perllib");
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| 28 | unshift (@INC, "$ext_prefix/perllib/cpan");
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| 29 | unshift (@INC, "$ext_prefix/perllib/plugins");
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| 30 | unshift (@INC, "$ext_prefix/perllib/classify");
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| 31 | }
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| 32 | }
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| 33 | if (defined $ENV{'GSDL3EXTS'})
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| 34 | {
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| 35 | my @extensions = split(/:/,$ENV{'GSDL3EXTS'});
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| 36 | foreach my $e (@extensions)
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| 37 | {
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| 38 | my $ext_prefix = "$ENV{'GSDL3SRCHOME'}/ext/$e";
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| 39 | unshift (@INC, "$ext_prefix/perllib");
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| 40 | unshift (@INC, "$ext_prefix/perllib/cpan");
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| 41 | unshift (@INC, "$ext_prefix/perllib/plugins");
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| 42 | unshift (@INC, "$ext_prefix/perllib/classify");
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| 43 | }
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| 44 | }
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| 45 |
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| 46 | # Manually installed CPAN package in GEXT*INSTALL
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| 47 | unshift (@INC, $ENV{'GEXTPARALLELBUILDING_INSTALLED'} . "/share/perl5");
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| 48 | }
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| 49 |
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| 50 | use Cwd;
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| 51 | # Locking is required (otherwise other threads might glom onto the lock file
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| 52 | # before we've written our port number to it).
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| 53 | use Fcntl qw(:flock);
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| 54 | # advanced child process control
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| 55 | use IPC::Run qw(harness start pump finish);
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| 56 | # the GDBMCLI tool accepts commands on STDIN and write results on STDOUT
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| 57 | # so we'll need a double ended pipe
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| 58 | # @note couldn't get this to reliably work when passing between threads
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| 59 | #use IPC::Open2;
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| 60 | # we need to run as a daemon
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| 61 | use Proc::Daemon;
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| 62 | # and the whole thing will need to accept requests from multiple threads, and
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| 63 | # so will need threads in and of itself
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| 64 | use threads;
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| 65 | use threads::shared;
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| 66 |
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| 67 | # Greenstone utility functions (filename_cat)
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| 68 | use util;
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| 69 | # A simple server that listens on a socket and 'forks' off child threads to
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| 70 | # handle each incoming request
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| 71 | use SocketsSwimmingThreadPoolServer;
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| 72 |
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| 73 | # Globally available
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| 74 | my $parent_pid = 0;
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| 75 | my $infodb_file_path = '';
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| 76 | my $remove_old = '';
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| 77 | my $gdbm;
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| 78 | my $gdbm_reader;
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| 79 | my $gdbm_writer;
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| 80 | my $debug = 1;
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| 81 | my $server;
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| 82 | # - shared and, more importantly, lockable
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| 83 | my %listeners :shared;
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| 84 | my $accessing_gdbm :shared;
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| 85 | my $should_stop :shared;
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| 86 | my $debug_log :shared;
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| 87 |
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| 88 | print "===== GDBM Server =====\n";
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| 89 | print "Provides a persistent connection to one or more GDBM databases via a\n";
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| 90 | print "pool of threads listening on a specific socket.\n";
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| 91 |
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| 92 | MAIN:
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| 93 | {
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| 94 | $accessing_gdbm = 0;
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| 95 | $should_stop = 0;
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| 96 | $debug_log = 0;
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| 97 |
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| 98 | # Check arguments
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| 99 | if (!defined $ARGV[0] || !defined $ARGV[1])
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| 100 | {
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| 101 | print "Error! Missing parent process id or path to database\n\n";
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| 102 | print "Usage: GDBMServer.pl <pid name> <path to database> [-removeold] [-nodaemon] [-debug]\n\n";
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| 103 | exit(0);
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| 104 | }
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| 105 | $parent_pid = $ARGV[0];
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| 106 | $infodb_file_path = $ARGV[1];
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| 107 | my $no_daemon = 0;
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| 108 | my $i = 2;
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| 109 | while (defined $ARGV[$i])
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| 110 | {
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| 111 | if ($ARGV[$i] eq "-nodaemon")
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| 112 | {
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| 113 | $no_daemon = 1;
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| 114 | }
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| 115 | if ($ARGV[$i] eq "-removeold")
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| 116 | {
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| 117 | $remove_old = '-removeold ';
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| 118 | }
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| 119 | if ($ARGV[$i] eq "-debug")
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| 120 | {
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| 121 | $debug = 1;
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| 122 | }
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| 123 | $i++;
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| 124 | }
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| 125 |
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| 126 | if ($debug)
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| 127 | {
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| 128 | print " - parent pid: " . $parent_pid . "\n";
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| 129 | print " - infodb: " . $infodb_file_path . "\n";
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| 130 | print " - no daemon? " . $no_daemon . "\n";
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| 131 | print " - remove old? " . $remove_old . "\n";
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| 132 | print " - debug? yes\n";
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| 133 | print "\n";
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| 134 | }
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| 135 |
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| 136 | # Information about any running GDBMServer is stored in a lockfile in
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| 137 | # Greenstone's tmp directory (and based on the database opened)
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| 138 | my $tmp_dir = &util::filename_cat($ENV{'GSDLHOME'}, "tmp");
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| 139 | my ($infodb_file, $extension) = $infodb_file_path =~ /([^\\\/]+)\.(db|gdb)$/i;
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| 140 | my $server_lockfile_path = &util::filename_cat($tmp_dir, 'gdbmserver-' . $infodb_file . '.lock');
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| 141 |
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| 142 | # If already running, then exit
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| 143 | print " * Testing for other GDBMServers already running... ";
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| 144 | if (-e $server_lockfile_path)
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| 145 | {
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| 146 | print "Error! GDBMServer already running!\n";
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| 147 | print "Lockfile found at: " . $server_lockfile_path . "\n";
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| 148 | exit(0);
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| 149 | }
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| 150 | print "All clear!\n";
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| 151 |
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| 152 | # Ensure we can see gdbmcli on the path
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| 153 | print " * Testing for GDBMCLI... ";
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| 154 | my $result = `gdbmcli 2>&1`;
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| 155 | if ($result !~ /GDBM Command Line Interface/)
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| 156 | {
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| 157 | print "Error! GDBMCLI not available - check path.\n";
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| 158 | exit(0);
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| 159 | }
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| 160 | print "Found!\n";
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| 161 |
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| 162 | # @note Easiest way to figure out the open file descriptors is to close them.
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| 163 | # You start by figure out what the maximum number of file handles is
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| 164 | # for your system. You then iterate through trying to close them using
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| 165 | # the POSIX close function - which returns true iif the file descriptor
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| 166 | # existed and was successfully closed. You can then keep track of the
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| 167 | # highest file descriptor number successfully closed. Do this before and
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| 168 | # after your desired function call (like start() below) and the
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| 169 | # difference in hc_fd gives your new file descriptors in use! [jmt12]
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| 170 | # my $openmax = POSIX::sysconf( &POSIX::_SC_OPEN_MAX );
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| 171 | # $openmax = ( ! defined( $openmax ) || $openmax < 0 ) ? ( shift || 64 ) : $openmax;
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| 172 | # my $hc_fd = 2;
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| 173 | # foreach ( 3 .. $openmax )
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| 174 | # {
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| 175 | # $hc_fd = $_ if POSIX::close( $_ );
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| 176 | # }
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| 177 | # print "[debug] After start fd count = " . $hc_fd . "\n";
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| 178 | # exit(0);
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| 179 |
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| 180 | # @note As mentioned above, I couldn't get the file handles produced by open2
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| 181 | # realiably shared between handles (even using the tricks mentioned on
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| 182 | # the perlmonks site - http://perlmonks.org/?node_id=395513). Typically
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| 183 | # they'd work the first time they were used (read or write) but
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| 184 | # subsequent actions would block indefinitely. Moreover, I couldn't get
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| 185 | # open2 to work as advertised and accept arguments (despite several
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| 186 | # hours of dicking around) - and the work-around to make the dbpath the
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| 187 | # first lot of IO works, but then definately causes the next action to
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| 188 | # block forever. [jmt12]
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| 189 | # #my @cmd = ('gdbmcli',$infodb_file_path); # doesn't work - runs gdbmcli twice?
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| 190 | # my @cmd = ('gdbmcli');
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| 191 | # $gdbm_reader = IO::Handle->new();
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| 192 | # $gdbm_writer = IO::Handle->new();
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| 193 | # print " * Opening GDBM database\n";
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| 194 | # $gdbm_pid = open2($gdbm_reader, $gdbm_writer, 'gdbmcli');
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| 195 | # if (!$gdbm_writer)
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| 196 | # {
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| 197 | # die("Error! Failed to open GDBMCLI for writing\n");
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| 198 | # }
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| 199 | # if (!$gdbm_reader)
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| 200 | # {
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| 201 | # die("Error! Failed to open GDBMCLI for reading\n");
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| 202 | # }
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| 203 | # # For ungodly reasons open2 doesn't work as advertised - it doesn't pass any
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| 204 | # # arguments - so instead the first command to the GDBMCLI is the path to the
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| 205 | # # GDBM database to load.
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| 206 | # print $gdbm_writer $infodb_file_path . "\n" or die("Error! Failed to actually write something to GDBMCLI\n");
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| 207 | # my $load_result;
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| 208 | # if ($load_result = <$gdbm_reader>)
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| 209 | # {
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| 210 | # print $load_result;
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| 211 | # }
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| 212 | # else
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| 213 | # {
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| 214 | # die("Error! Failed to actually read something from GDBMCLI\n");
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| 215 | # }
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| 216 |
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| 217 | # Open the database connection
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| 218 | my @cmd = ('gdbmcli',$infodb_file_path);
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| 219 | $gdbm_writer = '';
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| 220 | $gdbm_reader = '';
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| 221 | # @note start opens a total of four file descriptors to the 'cmd', but
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| 222 | # we never get to know their names (maybe $gdbm->{'WIN'} etc but
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| 223 | # I'm note sure) so instead we just have to hope that the number
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| 224 | # of file descriptors already open doesn't change, in which case
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| 225 | # these are fd 3, 4, 5, and 6.
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| 226 | $gdbm = start \@cmd, \$gdbm_writer, \$gdbm_reader;
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| 227 |
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| 228 | # Daemonize
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| 229 | my $pid = 0;
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| 230 | if (!$no_daemon)
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| 231 | {
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| 232 | print " * Spawning Daemon...\n" unless (!$debug);
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| 233 | my $daemon_out_path = &util::filename_cat($ENV{'GEXTPARALLELBUILDING'},'logs', 'gdbmserver-' . $infodb_file . '.out');
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| 234 | my $daemon_err_path = &util::filename_cat($ENV{'GEXTPARALLELBUILDING'},'logs', 'gdbmserver-' . $infodb_file . '.err');
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| 235 | $pid = Proc::Daemon::Init( { work_dir => getcwd(),
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| 236 | child_STDOUT => $daemon_out_path,
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| 237 | child_STDERR => $daemon_err_path,
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| 238 | # @note as mentioned above, start creates four file descriptors that we need
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| 239 | # to keep open even through the separation of the daemon process.
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| 240 | dont_close_fd => [3,4,5,6]
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| 241 | } );
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| 242 | }
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| 243 |
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| 244 | # Parent process has pid > 0
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| 245 | if ($pid == 0)
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| 246 | {
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| 247 |
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| 248 | # Perform initializes here
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| 249 | # - database connection is now handled as a special command, as there may
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| 250 | # be multiple databases handled by this server
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| 251 | # - localhost is good enough for now
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| 252 | my $host = 'localhost';
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| 253 | # - determine a suitable port (checking that they aren't already in use)
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| 254 | # @note this isn't at all portable, but then neither is the daemon the
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| 255 | # way I've written it.
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| 256 | my $port = 8190;
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| 257 | my $result = `netstat -tnl | grep :$port`;
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| 258 | while ($result =~ /LISTEN/)
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| 259 | {
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| 260 | $port++;
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| 261 | $result = `netstat -tnl | grep :$port`;
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| 262 | }
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| 263 | # - create server object
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| 264 | print " * Creating pool of " . $thread_count . " threads listening on socket: " . $host . ":" . $port . "\n";
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| 265 | $server = SocketsSwimmingThreadPoolServer->new(host=>$host,
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| 266 | port=>$port,
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| 267 | processor_cb => \&process);
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| 268 |
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| 269 | # - write our port number into the lockfile so that other threads can figure
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| 270 | # out where we are
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| 271 | print " * Writing port number to lock file: " . $server_lockfile_path . "\n";
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| 272 | open(SLFH, ">", $server_lockfile_path) or die("Error! Failed to open file for writing: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 273 | flock(SLFH, LOCK_EX) or die("Error! Cannot lock file for writing: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 274 | print SLFH $host . ':' . $port;
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| 275 | flock(SLFH, LOCK_UN);
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| 276 | close(SLFH);
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| 277 |
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| 278 | # Perform main loop
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| 279 | # - loop is actually in Server code. start() only returns once server's stop
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| 280 | # command has been called
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| 281 | print " * Listening:\n";
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| 282 | $server->start;
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| 283 | print " * Stopping...\n";
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| 284 |
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| 285 | # Perform deinitializes here
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| 286 | # - remove server lockfile
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| 287 | print " * Removing lock file...\n";
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| 288 | unlink($server_lockfile_path);
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| 289 | # - now close database handles (forcing flush)
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| 290 | print " * Closing GDBMCLI\n";
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| 291 | finish($gdbm);
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| 292 | print "Done!\n";
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| 293 | }
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| 294 | else
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| 295 | {
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| 296 | print " * Waiting for GDBMServer lockfile to be created";
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| 297 | while (!-e $server_lockfile_path)
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| 298 | {
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| 299 | print '.';
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| 300 | sleep(1);
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| 301 | }
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| 302 | print "\n * GDBMServer lockfile created.\n";
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| 303 | open(SLFH, "<", $server_lockfile_path) or die("Error! Failed to open file for reading: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 304 | flock(SLFH, LOCK_SH) or die("Error! Cannot lock file for reading: " . $server_lockfile_path . "\nReason: " . $! . "\n");
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| 305 | my $line = <SLFH>;
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| 306 | if ($line =~ /(^.+):(\d+)$/)
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| 307 | {
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| 308 | print " => Server now listening on " . $1 . ":" . $2 . "\n";
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| 309 | }
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| 310 | else
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| 311 | {
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| 312 | die ("Error! Failed to retrieve host and port information from lockfile!");
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| 313 | }
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| 314 | flock(SLFH, LOCK_UN);
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| 315 | close(SLFH);
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| 316 | }
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| 317 |
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| 318 | print "===== Complete! =====\n";
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| 319 | }
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| 320 | exit(0);
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| 321 |
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| 322 | # /** @function process
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| 323 | # * A horribly named function that is called back to process each of the
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| 324 | # * requests to alter the GDBM database. It expects either a typical GDBM
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| 325 | # * text blob, or one of a limited number of special commands (which start
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| 326 | # * with the sentinel character "!"). Note that synchronization over the
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| 327 | # * open GDBM handle is used to ensure only one edit occurs at a time.
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| 328 | # */
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| 329 | sub process
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| 330 | {
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| 331 | my $data = shift @_;
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| 332 | my $value = "#ERROR#";
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| 333 | # Synchronized debug log writing
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| 334 | if ($debug)
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| 335 | {
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| 336 | lock($debug_log);
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| 337 | $|++;
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| 338 | print " << " . $data . "\n";
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| 339 | $|--;
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| 340 | }
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| 341 | # process special commands first
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| 342 | if ($data =~ /^!(.*):(.*)$/)
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| 343 | {
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| 344 | my $command = $1;
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| 345 | my $argument = $2;
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| 346 | # addlistener(<pid>)
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| 347 | if ($command eq "addlistener")
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| 348 | {
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| 349 | lock(%listeners);
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| 350 | $listeners{$argument} = 1;
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| 351 | my $listener_count = scalar(keys(%listeners));
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| 352 | $value = "[SUCCESS] added listener [" . $listener_count . " listeners]";
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| 353 | # unlock(%listeners)
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| 354 | }
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| 355 | # removelistener(<pid>)
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| 356 | elsif ($command eq "removelistener")
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| 357 | {
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| 358 | lock(%listeners);
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| 359 | if (defined $listeners{$argument})
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| 360 | {
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| 361 | delete $listeners{$argument};
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| 362 | }
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| 363 | my $listener_count = scalar(keys(%listeners));
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| 364 | lock($should_stop);
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| 365 | if ($should_stop == 1 && $listener_count == 0)
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| 366 | {
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| 367 | # server isn't shared, but the stop data member is!
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| 368 | $server->stop;
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| 369 | $value = "[SUCCESS] removed last listener, stopping";
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| 370 | }
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| 371 | else
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| 372 | {
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| 373 | $value = "[SUCCESS] removed listener [" . $listener_count . " listeners]";
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| 374 | }
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| 375 | # unlock($should_stop)
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| 376 | # unlock(%listeners)
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| 377 | }
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| 378 | # we may be asked to stop the server, but only by the process that created
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| 379 | # us. If there are no listeners registered, we stop straight away,
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| 380 | # otherwise we set a flag so that as soon as there are no listeners we
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| 381 | # stop.
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| 382 | elsif ($command eq "stop")
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| 383 | {
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| 384 | if ($argument ne $parent_pid && $argument ne "*")
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| 385 | {
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| 386 | $value = "[IGNORED] can only be stopped by parent process";
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| 387 | }
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| 388 | else
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| 389 | {
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| 390 | my $listener_count = 0;
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| 391 | {
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| 392 | lock(%listeners);
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| 393 | $listener_count = scalar(keys(%listeners));
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| 394 | # unlock(%listeners)
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| 395 | }
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| 396 | if ($listener_count == 0)
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| 397 | {
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| 398 | # server isn't shared, but the stop data member is!
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| 399 | $server->stop;
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| 400 | $value = "[SUCCESS] stopping";
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| 401 | }
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| 402 | else
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| 403 | {
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| 404 | lock($should_stop);
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| 405 | $should_stop = 1;
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| 406 | $value = "[PENDING] will stop when no more listeners";
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| 407 | # unlock($should_stop)
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| 408 | }
|
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| 409 | }
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|---|
| 410 | }
|
|---|
| 411 | }
|
|---|
| 412 | # Everything thing else should be a GDBMCLI command
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| 413 | else
|
|---|
| 414 | {
|
|---|
| 415 | lock($accessing_gdbm);
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|---|
| 416 | # lets check that we can still access the GDBM bidirectional pump
|
|---|
| 417 | if (!pumpable $gdbm)
|
|---|
| 418 | {
|
|---|
| 419 | die("Error! Somehow the underlying GDBM bidirectional pipe has gone away!");
|
|---|
| 420 | }
|
|---|
| 421 | # - write the command to GDBM
|
|---|
| 422 | $gdbm_writer = $data . "\n";
|
|---|
| 423 | $gdbm_reader = '';
|
|---|
| 424 | #rint "[debug] sending command to gdbmcli\n";
|
|---|
| 425 | pump($gdbm) while length($gdbm_writer);
|
|---|
| 426 | #rint "[debug] reading output from gdbmcli\n";
|
|---|
| 427 | pump($gdbm) until $gdbm_reader =~ /-{70}/;
|
|---|
| 428 | $value = $gdbm_reader;
|
|---|
| 429 | # trim value
|
|---|
| 430 | chomp($value);
|
|---|
| 431 | #rint "[debug] result: " . $value . "\n";
|
|---|
| 432 | #unlock($accessing_gdbm);
|
|---|
| 433 | }
|
|---|
| 434 | # Synchronized debug log writing
|
|---|
| 435 | if ($debug)
|
|---|
| 436 | {
|
|---|
| 437 | lock($debug_log);
|
|---|
| 438 | $|++;
|
|---|
| 439 | print " >> " . $value . "\n\n";
|
|---|
| 440 | $|--;
|
|---|
| 441 | }
|
|---|
| 442 | return $value;
|
|---|
| 443 | }
|
|---|
