source: gs3-extensions/solr/trunk/src/perllib/solrserver.pm@ 27858

###########################################################################
#
# solrserver.pm -- class for starting and stopping the Solr/jetty server
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################


package solrserver;

use strict; 
#no strict 'refs';

use solrutil;

sub new {
    my $class = shift(@_);
    my ($build_dir) = @_;

    my $self = { 'jetty_stop_key' => "greenstone-solr" };

    $self->{'build_dir'} = $build_dir;

    my $search_path = &solrutil::get_search_path();

    my $server_jar = &util::filename_cat("lib","java","solr-jetty-server.jar");
    my $full_server_jar = solrutil::locate_file($search_path,$server_jar);
    $self->{'full_server_jar'} = $full_server_jar;

    $self->{'jetty_explicitly_started'} = undef;

    my $jetty_server_port = $ENV{'SOLR_JETTY_PORT'};
    my $base_url = "http://localhost:$jetty_server_port/solr/";
    my $admin_url = "http://localhost:$jetty_server_port/solr/admin/cores";
    
    $self->{'base-url'} = $base_url;
    $self->{'admin-url'} = $admin_url;

    return bless $self, $class;
}

sub set_jetty_stop_key {
    my $self = shift (@_);
    my ($stop_key) = @_;

    $self->{'jetty_stop_key'} = $stop_key if defined $stop_key;
}

sub _wget_service
{
    my $self = shift (@_);
    my ($output_format,$url,$cgi_get_args) = @_;

    my $full_url = $url;

    $url .= "?$cgi_get_args" if (defined $cgi_get_args);
    
    my $cmd = "wget -O - \"$url\" 2>&1";

    my $preamble_output = "";    
    my $xml_output = "";
    my $error_output = undef;

    my $in_preamble = ($output_format eq "xml") ? 1 : 0;
    
##    print STDERR "**** wgetcmd = \n $cmd\n";

    if (open(WIN,"$cmd |")) {

    my $line;
    while (defined ($line=<WIN>)) {

        if ($line =~ m/ERROR \d+:/) {
        chomp $line;
        $error_output = $line;
        last;
        }
        elsif ($line =~ m/failed: Connection refused/) {
        chomp $line;
        $error_output = $line;
        last;
        }
        elsif ($in_preamble) {
        if ($line =~ m/<.*>/) {
            $in_preamble = 0;
        }
        else {
            $preamble_output .= $line;
        }
        }

        if (! $in_preamble) {
        $xml_output .= $line;
        }
    }
    close(WIN);

    }
    else {
    $error_output = "Error: failed to run $cmd\n";
    $error_output .= "  $!\n";
    }

    my $output = { 'url'      => $full_url,
           'preamble' => $preamble_output,
           'output'   => $xml_output,
           'error'    => $error_output };

    return $output;
}


sub _base_service
{
    my $self = shift (@_);
    my ($cgi_get_args) = @_;

    my $base_url = $self->{'base-url'};

    return $self->_wget_service("html",$base_url,$cgi_get_args);
}
 
sub _admin_service
{
    my $self = shift (@_);
    my ($cgi_get_args) = @_;

    my $admin_url = $self->{'admin-url'};

    return $self->_wget_service("xml",$admin_url,$cgi_get_args);
}


sub server_running
{
    my $self = shift @_;

    my $output = $self->_base_service();

    my $have_error = defined $output->{'error'};

    my $running = !$have_error;

    return $running;
}


sub admin_ping_core
{
    my $self = shift @_;
    my ($core) = @_;

    my $cgi_get_args = "action=STATUS&core=$core";

    my $ping_status = 1;

    my $output = $self->_admin_service($cgi_get_args);

    if (defined $output->{'error'}) {
    # severe error, such as failing to connect to the server
    $ping_status = 0;

    my $url      = $output->{'url'};
    my $preamble = $output->{'preamble'};
    my $error    = $output->{'error'};
    
    print STDERR "----\n";
    print STDERR "Error: Failed to get XML response from:\n";
    print STDERR "         $url\n";
    print STDERR "Output was:\n";
    print STDERR $preamble if ($preamble ne "");
    print STDERR "$error\n";
    print STDERR "----\n";
    }
    else {
    
    # If the collection doesn't exist yet, then there will be
    # an empty element of the form:
    #   <lst name="collect-doc"/>
    # where 'collect' is the actual name of the collection, 
    # such as demo

    my $xml_output = $output->{'output'};
    
    my $empty_element="<lst\\s+name=\"$core\"\\s*\\/>";
    
    $ping_status = !($xml_output =~ m/$empty_element/s);
    }

    return $ping_status;
}

sub filtered_copy
{
    my $self = shift @_;
    my ($src_file,$dst_file,$re_substitutions) = @_;

    my $sep = shift @_ || "/";
    my $flags = shift @_ || "g";

    # $re_substitutions is a hashmap of the form: [re_key] => subst_str

    my $content = "";

    if (open(FIN,'<:utf8',$src_file)) {

    my $line;
    while (defined($line=<FIN>)) {
        $content .= $line;
    }
    }

    close(FIN);

    # perform RE string substitutions
    foreach my $re_key (keys %$re_substitutions) {

    my $subst_str = $re_substitutions->{$re_key};

    # Perform substitution of the form:
    #  $content =~ s/$re_key/$subst_str/g;
    # but allow allow separator char (default '/') 
    # and flags (default 'g') to be parameterized

    my $eval_str = "\$content =~ s$sep$re_key$sep$subst_str$sep$flags";

    eval {
        $eval_str;
    };
    if ($@) {
        print STDERR "Warning: failed to evaluate\n   $eval_str\n$@\n";
    }

    }
    
    if (open(FOUT, '>:utf8', $dst_file)) {
    print FOUT $content;
    close(FOUT);
    }
    else {
    print STDERR "Error: Failed to open file '$dst_file' for writing.\n$!\n";
    }   
}

sub solr_xml_to_solr_xml_in
{
    my $self = shift @_;

    my $gsdl3home = $ENV{'GSDL3HOME'};
    my $web_solr_ext_dir = &util::filename_cat($gsdl3home, "ext", "solr");
    my $web_solrxml_in = &util::filename_cat($web_solr_ext_dir, "solr.xml.in");
    my $web_solrxml = &util::filename_cat($web_solr_ext_dir, "solr.xml");

    my $replacement_map = { "$gsdl3home" => "\\\@gsdl3home\\\@" };
 
    $self->filtered_copy($web_solrxml,$web_solrxml_in,$replacement_map, "^", "g");
}


sub solr_xml_in_to_solr_xml
{
    my $self = shift @_;

    my $gsdl3home = $ENV{'GSDL3HOME'};
    my $web_solr_ext_dir = &util::filename_cat($gsdl3home, "ext", "solr");
    my $web_solrxml_in = &util::filename_cat($web_solr_ext_dir, "solr.xml.in");
    my $web_solrxml = &util::filename_cat($web_solr_ext_dir, "solr.xml");
    
    my $replacement_map = { "\\\@gsdl3home\\\@" => "$gsdl3home" };
 
    $self->filtered_copy($web_solrxml_in,$web_solrxml,$replacement_map, "^", "g");
}


# Some of the Solr CoreAdmin API calls available. 
# See http://wiki.apache.org/solr/CoreAdmin
sub admin_reload_core
{
    my $self = shift @_;
    my ($core) = @_;

    my $cgi_get_args = "action=RELOAD&core=$core";

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

sub admin_rename_core
{
    my $self = shift @_;
    my ($oldcore, $newcore) = @_;

    my $cgi_get_args = "action=RENAME&core=$oldcore&other=$newcore";

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

sub admin_swap_core
{
    my $self = shift @_;
    my ($oldcore, $newcore) = @_;

    my $cgi_get_args = "action=SWAP&core=$oldcore&other=$newcore";

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

# The ALIAS action is not supported in our version of solr (despite it
# being marked as experimental in the documentation for Core Admin)
sub admin_alias_core
{
    my $self = shift @_;
    my ($oldcore, $newcore) = @_;

    my $cgi_get_args = "action=ALIAS&core=$oldcore&other=$newcore";

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

sub admin_create_core
{
    my $self = shift @_;
    my ($core, $data_parent_dir) = @_; # data_parent_dir is optional, can be index_dir. Defaults to builddir if not provided

    my ($ds_idx) = ($core =~ m/^.*-(.*?)$/);

    my $cgi_get_args = "action=CREATE&name=$core";

    my $collect_home = $ENV{'GSDLCOLLECTDIR'};
    my $etc_dirname = &util::filename_cat($collect_home,"etc");

    if(!defined $data_parent_dir) {
    $data_parent_dir = $self->{'build_dir'};
    } 
    
    my $idx_dirname = &util::filename_cat($data_parent_dir,$ds_idx); # "dataDir"  
        
    $cgi_get_args .= "&instanceDir=$etc_dirname";
    $cgi_get_args .= "&dataDir=$idx_dirname";

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

# removes (unloads) core from the ext/solr/sorl.xml config file
sub admin_unload_core
{
    my $self = shift @_;
    my ($core, $delete) = @_;

    my $cgi_get_args = "action=UNLOAD&core=$core"; # &deleteIndex=true from Solr3.3
    if(defined $delete && $delete == 1) {
    $cgi_get_args = $cgi_get_args."&deleteIndex=true";
    }

    $self->_admin_service($cgi_get_args);

    $self->solr_xml_to_solr_xml_in();
}

sub copy_solrxml_to_web
{
    my $self = shift @_;

    my $ext_solrxml = &util::filename_cat($ENV{'GEXT_SOLR'}, "solr.xml.in");
    my $web_solrxml = &util::filename_cat($ENV{'GSDL3HOME'}, "ext", "solr", "solr.xml.in");

    #print STDERR "@@@@ Copying $ext_solrxml to $web_solrxml...\n";

    &FileUtils::copyFiles($ext_solrxml, $web_solrxml);

    $self->solr_xml_in_to_solr_xml();
}

sub start
{
    my $self = shift @_;
    my ($verbosity) = @_;
    
    $verbosity = 1 unless defined $verbosity;

    my $solr_home         = $ENV{'GEXT_SOLR'};
    my $jetty_stop_port   = $ENV{'JETTY_STOP_PORT'};
    my $jetty_server_port = $ENV{'SOLR_JETTY_PORT'};

    chdir($solr_home);
    
##    my $solr_etc = &util::filename_cat($solr_home,"etc");

    my $server_props = "-DSTOP.PORT=$jetty_stop_port";
    $server_props .= " -DSTOP.KEY=".$self->{'jetty_stop_key'};
    $server_props .= " -Dsolr.solr.home=$solr_home";

    my $full_server_jar = $self->{'full_server_jar'};
    
    my $server_java_cmd = "java $server_props -jar \"$full_server_jar\"";


    my $server_status = "unknown";

    if ($self->server_running()) {
    $server_status = "already-running";
    }
    elsif (open(STARTIN,"$server_java_cmd 2>&1 |")) {

    print STDERR "**** starting up solr jetty server with cmd start =\n $server_java_cmd\n" if ($verbosity > 1);

    my $line;
    while (defined($line=<STARTIN>)) {
        # Scan through output until you see a line like:
        #   2011-08-22 .. :INFO::Started [email protected]:8983
        # which signifies that the server has started up and is
        # "ready and listening"
    
        if (($line =~ m/^(WARN|ERROR|SEVERE):/)
        || ($line =~ m/^[0-9 :-]*(WARN|ERROR|SEVERE)::/)) {
        print "Jetty startup: $line";
        }
        
        if ($line =~ m/WARN::failed SocketConnector/) {
        if ($line =~ m/Address already in use/) {
            $server_status = "already-running";
        }
        else {
            $server_status = "failed-to-start";
        }
        last;
        }
        
        if ($line =~ m/INFO::Started SocketConnector/) {
        $server_status = "explicitly-started";
        last;
        }
    }
    }
    else {
    print STDERR "Error: failed to start solr-jetty-server\n";
    print STDERR "$!\n";
    print STDERR "Command attempted was:\n";
    print STDERR "  $server_java_cmd\n";
    print STDERR "run from directory:\n";
    print STDERR "  $solr_home\n";
    print STDERR "----\n";

    exit -1;
    }

    if ($server_status eq "explicitly-started") {
    $self->{'jetty_explicitly_started'} = 1;
    print "Jetty server ready and listening for connections on port";
    print " $jetty_server_port\n";
        
    # now we know the server is ready to accept connections, fork a
    # child process that continues to listen to the output and
    # prints out any lines that are not INFO lines

    if (fork()==0) {
        # child process

        my $line;
        while (defined ($line = <STARTIN>)) {

#       if (($line =~ m/^(WARN|ERROR|SEVERE):/)
#           || ($line =~ m/^[0-9 :-]*(WARN|ERROR|SEVERE)::/)) {
#           print "Jetty $line";
#       }

        # skip info lines
        next if ($line =~ m/^INFO:/);
        next if ($line =~ m/^[0-9 :-]*INFO::/);
        next if ($line =~ m/^\d{2}\/\d{2}\/\d{4}\s+/); 
        next if ($line =~ m/^\d{4}-\d{2}-\d{2}\s+/); 

##      next if ($line =~ m/^\s*\w+{.*}/);

        # if here, then some non-trival message has been logged
        print "Jetty/Solr processing: $line";
        }
        close(STARTIN);
        
        # And now stop nicely
        exit 0;
    }
    # otherwise let the parent continue on
    }
    elsif ($server_status eq "already-running") {
    print STDERR "Using existing server detected on port $jetty_server_port\n";
    $self->{'jetty_explicitly_started'} = 0;
    }
    elsif ($server_status eq "failed-to-start") {
    print STDERR "Started Solr/Jetty web server on port $jetty_server_port";
    print STDERR ", but encountered an initialization error\n";
    exit -1;
    }

}

sub explicitly_started
{
    my $self = shift @_;

    return $self->{'jetty_explicitly_started'};
}

sub stop
{    
    my $self = shift @_;
    my ($options) = @_;

    my $solr_home         = $ENV{'GEXT_SOLR'};

    chdir($solr_home);

    # defaults
    my $do_wait = 1; 
    my $output_verbosity = 1;

    if (defined $options) {
    if (defined $options->{'do_wait'}) {
        $do_wait = $options->{'do_wait'};
    }
    if (defined $options->{'output_verbosity'}) {
        $output_verbosity = $options->{'output_verbosity'};
    }
    }

    my $full_server_jar = $self->{'full_server_jar'};
    my $jetty_stop_port = $ENV{'JETTY_STOP_PORT'};
    
    my $server_props = "-DSTOP.PORT=$jetty_stop_port";
    $server_props   .= " -DSTOP.KEY=".$self->{'jetty_stop_key'};
    my $server_java_cmd = "java $server_props -jar \"$full_server_jar\" --stop";

    print STDERR "**** java server stop cmd:\n  $server_java_cmd\n" if ($output_verbosity>1);

    if (open(STOPIN,"$server_java_cmd 2>&1 |")) {

    my $line;
    while (defined($line=<STOPIN>)) {
        print "Jetty shutdown: $line" if ($output_verbosity>1);
    }
    close(STOPIN);

    if ($do_wait) {
        wait(); # let the child process finish
    }

    if ($output_verbosity>0) {
        print "Jetty server shutdown\n";
    }
    }
    else {
    print STDERR "Error: failed to stop solr-jetty-server\n";
    print STDERR "$!\n";
    print STDERR "Command attempted was:\n";
    print STDERR "  $server_java_cmd\n";
    print STDERR "run from directory:\n";
    print STDERR "  $solr_home\n";
    print STDERR "----\n";

    exit -2;
    }
}



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