#
# Copyright 2018 Centreon (http://www.centreon.com/)
#
# Centreon is a full-fledged industry-strength solution that meets
# the needs in IT infrastructure and application monitoring for
# service performance.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

package apps::tomcat::web::mode::requestinfo;

use base qw(centreon::plugins::mode);
use strict;
use warnings;
use centreon::plugins::http;
use centreon::plugins::statefile;
use Digest::MD5 qw(md5_hex);
use XML::XPath;
use URI::Escape;

sub new {
    my ($class, %options) = @_;
    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
    bless $self, $class;

    $self->{version} = '1.0';
    $options{options}->add_options(arguments =>
            {
            "hostname:s"                 => { name => 'hostname' },
            "port:s"                     => { name => 'port', default => '8080' },
            "proto:s"                    => { name => 'proto' },
            "credentials"                => { name => 'credentials' },
            "basic"                      => { name => 'basic' },
            "username:s"                 => { name => 'username' },
            "password:s"                 => { name => 'password' },
            "proxyurl:s"                 => { name => 'proxyurl' },
            "timeout:s"                  => { name => 'timeout' },
            "ssl-opt:s@"                 => { name => 'ssl_opt' },
            "urlpath:s"                  => { name => 'url_path', default => '/manager/status?XML=true' },
            "name:s"                     => { name => 'name' },
            "regexp"                     => { name => 'use_regexp' },
            "regexp-isensitive"          => { name => 'use_regexpi' },
            "warning-maxtime:s"          => { name => 'warning_maxtime' },
            "critical-maxtime:s"         => { name => 'critical_maxtime' },
            "warning-processingtime:s"   => { name => 'warning_processingtime' },
            "critical-processingtime:s"  => { name => 'critical_processingtime' },
            "warning-requestcount:s"     => { name => 'warning_requestcount' },
            "critical-requestcount:s"    => { name => 'critical_requestcount' },
            "warning-errorcount:s"       => { name => 'warning_errorcount' },
            "critical-errorcount:s"      => { name => 'critical_errorcount' },
            });

    $self->{result} = {};
    $self->{hostname} = undef;
    $self->{statefile_value} = centreon::plugins::statefile->new(%options);
    $self->{http} = centreon::plugins::http->new(output => $self->{output});
    return $self;
}

sub check_options {
    my ($self, %options) = @_;
    $self->SUPER::init(%options);
    
    #MaxTime
    if (($self->{perfdata}->threshold_validate(label => 'warning-maxtime', value => $self->{option_results}->{warning_maxtime})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong warning 'warning-maxtime' threshold '" . $self->{option_results}->{warning_maxtime} . "'.");
        $self->{output}->option_exit();
    }
    if (($self->{perfdata}->threshold_validate(label => 'critical-maxtime', value => $self->{option_results}->{critical_maxtime})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong critical 'critical-maxtime' threshold '" . $self->{option_results}->{critical_maxtime} . "'.");
        $self->{output}->option_exit();
    }
    #processingTime
    if (($self->{perfdata}->threshold_validate(label => 'warning-processingtime', value => $self->{option_results}->{warning_processingtime})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong warning 'warning-processingtime' threshold '" . $self->{option_results}->{warning_processingtime} . "'.");
        $self->{output}->option_exit();
    }
    if (($self->{perfdata}->threshold_validate(label => 'critical-processingtime', value => $self->{option_results}->{critical_processingtime})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong critical 'critical-processingtime' threshold '" . $self->{option_results}->{critical_processingtime} . "'.");
        $self->{output}->option_exit();
    }
    #requestCount
    if (($self->{perfdata}->threshold_validate(label => 'warning-requestcount', value => $self->{option_results}->{warning_requestcount})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong warning 'warning-requestcount' threshold '" . $self->{option_results}->{warning_requestcount} . "'.");
        $self->{output}->option_exit();
    }
    if (($self->{perfdata}->threshold_validate(label => 'critical-requestcount', value => $self->{option_results}->{critical_requestcount})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong critical 'critical-requestcount' threshold '" . $self->{option_results}->{critical_requestcount} . "'.");
        $self->{output}->option_exit();
    }
    #errorCount
    if (($self->{perfdata}->threshold_validate(label => 'warning-errorcount', value => $self->{option_results}->{warning_errorcount})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong warning 'warning-errorcount' threshold '" . $self->{option_results}->{warning_errorcount} . "'.");
        $self->{output}->option_exit();
    }
    if (($self->{perfdata}->threshold_validate(label => 'critical-errorcount', value => $self->{option_results}->{critical_errorcount})) == 0) {
        $self->{output}->add_option_msg(short_msg => "Wrong critical 'critical-errorcount' threshold '" . $self->{option_results}->{critical_errorcount} . "'.");
        $self->{output}->option_exit();
    }

    $self->{statefile_value}->check_options(%options);
    $self->{hostname} = $self->{option_results}->{hostname};
    if (!defined($self->{hostname})) {
        $self->{hostname} = 'me';
    }
    
    $self->{http}->set_options(%{$self->{option_results}});
}

my %xpath_to_check = (
    requestInfo_maxTime         => '/status/connector/requestInfo/@maxTime',            #
    requestInfo_processingTime  => '/status/connector/requestInfo/@processingTime',     #to last
    requestInfo_requestCount    => '/status/connector/requestInfo/@requestCount',       #to last
    requestInfo_errorCount      => '/status/connector/requestInfo/@errorCount',         #to last
);

sub manage_selection {
    my ($self, %options) = @_;

    my $webcontent = $self->{http}->request();
    my $port = $self->{option_results}->{port};

    #EXAMPLE 1:
    #<status>
    #  <connector name="http-0">
    #    <threadInfo currentThreadCount="0" currentThreadsBusy="0" maxThreads="200"/>
    #    <requestInfo bytesReceived="0" bytesSent="0" errorCount="0" maxTime="0" processingTime="0" requestCount="0"/>
    #    <workers></workers>
    #  </connector>
    #  <connector name="http-8080">
    #    <threadInfo currentThreadCount="158" currentThreadsBusy="10" maxThreads="200"/>
    #    <requestInfo bytesReceived="297" bytesSent="19350704517" errorCount="192504" maxTime="249349" processingTime="2242513592" requestCount="983650"/>
    #    <workers>
    #    </workers>
    #  </connector>
    #</status>

    #EXAMPLE 2:
    #<status>
    #<jvm>
    #    <memory free='409303928' total='518979584' max='518979584'/>
    #    <memorypool name='Eden Space' type='Heap memory' usageInit='143130624' usageCommitted='143130624' usageMax='143130624' usageUsed='56881560'/>
    #    <memorypool name='Survivor Space' type='Heap memory' usageInit='17891328' usageCommitted='17891328' usageMax='17891328' usageUsed='17891328'/>
    #    <memorypool name='Tenured Gen' type='Heap memory' usageInit='357957632' usageCommitted='357957632' usageMax='357957632' usageUsed='34902768'/>
    #    <memorypool name='Code Cache' type='Non-heap memory' usageInit='2555904' usageCommitted='2555904' usageMax='50331648' usageUsed='1899840'/>
    #    <memorypool name='Perm Gen' type='Non-heap memory' usageInit='21757952' usageCommitted='21757952' usageMax='85983232' usageUsed='21372688'/>
    #</jvm>
    #<connector name='"http-bio-10.1.80.149-22002"'><threadInfo  maxThreads="5" currentThreadCount="2" currentThreadsBusy="1" />
    #    <requestInfo  maxTime="1216" processingTime="1216" requestCount="1" errorCount="1" bytesReceived="0" bytesSent="2474" />
    #    <workers>
    #        <worker  stage="S" requestProcessingTime="23" requestBytesSent="0" requestBytesReceived="0" remoteAddr="10.1.80.149" virtualHost="examplehost" method="GET" currentUri="/manager/status" currentQueryString="XML=true" protocol="HTTP/1.1" />
    #    </workers>
    #</connector>
    #<connector name='"ajp-bio-10.1.80.149-22001"'><threadInfo  maxThreads="150" currentThreadCount="0" currentThreadsBusy="0" />
    #    <requestInfo  maxTime="0" processingTime="0" requestCount="0" errorCount="0" bytesReceived="0" bytesSent="0" />
    #    <workers>
    #    </workers>
    #</connector>
    #</status>

    #GET XML DATA
    my $xpath = XML::XPath->new( xml => $webcontent );
    my %xpath_check_results;

    foreach my $xpath_check ( keys %xpath_to_check ) {
        my $singlepath = $xpath_to_check{$xpath_check};
        $singlepath =~ s{\$port}{$port};
        my $nodeset = $xpath->find($singlepath);

        foreach my $node ($nodeset->get_nodelist) {
            my $connector_name = $node->getParentNode()->getParentNode()->getAttribute("name");
            $connector_name =~ s/^["'\s]+//;
            $connector_name =~ s/["'\s]+$//;
            $connector_name = uri_unescape($connector_name);

            next if (defined($self->{option_results}->{name}) && defined($self->{option_results}->{use_regexp}) && defined($self->{option_results}->{use_regexpi}) 
                && $connector_name !~ /$self->{option_results}->{name}/i);
            next if (defined($self->{option_results}->{name}) && defined($self->{option_results}->{use_regexp}) && !defined($self->{option_results}->{use_regexpi}) 
                && $connector_name !~ /$self->{option_results}->{name}/);
            next if (defined($self->{option_results}->{name}) && !defined($self->{option_results}->{use_regexp}) && !defined($self->{option_results}->{use_regexpi})
                && $connector_name ne $self->{option_results}->{name});

            my $value = $node->string_value();
            if ( $value =~ /^"?([0-9.]+)"?$/ ) {
                $self->{result}->{$connector_name}{$xpath_check} = $1;
            } else {
                $self->{result}->{$connector_name}{$xpath_check} = "not_numeric";
            };
        };

        if (scalar(keys %{$self->{result}}) <= 0) {
            if (defined($self->{option_results}->{name})) {
                $self->{output}->add_option_msg(short_msg => "No information found for name '" . $self->{option_results}->{name} . "'.");
            } else {
                $self->{output}->add_option_msg(short_msg => "No information found.");
            }
            $self->{output}->option_exit();
        };
    };
};

sub run {
    my ($self, %options) = @_;
    
    $self->manage_selection();

    my $new_datas = {};
    $self->{statefile_value}->read(statefile => 'cache_apps_tomcat_web_' . $self->{option_results}->{hostname}  . '_' . $self->{http}->get_port() . '_' . $self->{mode} . '_' . (defined($self->{option_results}->{name}) ? md5_hex($self->{option_results}->{name}) : md5_hex('all')));
    $new_datas->{last_timestamp} = time();
    my $old_timestamp = $self->{statefile_value}->get(name => 'last_timestamp');

    if (!defined($self->{option_results}->{name}) || defined($self->{option_results}->{use_regexp})) {
        $self->{output}->output_add(severity => 'OK',
                                    short_msg => 'All requestInfo Data are ok.');
    }

    foreach my $name (sort(keys %{$self->{result}})) {
        $new_datas->{'requestInfo_processingTime_' . $name} = $self->{result}->{$name}->{requestInfo_processingTime};
        $new_datas->{'requestInfo_requestCount_' . $name} = $self->{result}->{$name}->{requestInfo_requestCount};
        $new_datas->{'requestInfo_errorCount_' . $name} = $self->{result}->{$name}->{requestInfo_errorCount};

        my $requestInfo_processingTime = $self->{statefile_value}->get(name => 'requestInfo_processingTime_' . $name);
        my $requestInfo_requestCount = $self->{statefile_value}->get(name => 'requestInfo_requestCount_' . $name);
        my $requestInfo_errorCount = $self->{statefile_value}->get(name => 'requestInfo_errorCount_' . $name);

        if (!defined($old_timestamp) || !defined($requestInfo_processingTime) || !defined($requestInfo_requestCount) || !defined($requestInfo_errorCount)) {
            next;
        }
        if ($new_datas->{'requestInfo_processingTime_' . $name} < $requestInfo_processingTime) {
            # We set 0. Has reboot.
            $requestInfo_processingTime = 0;
        }
        if ($new_datas->{'requestInfo_requestCount_' . $name} < $requestInfo_requestCount) {
            # We set 0. Has reboot.
            $requestInfo_requestCount = 0;
        }
        if ($new_datas->{'requestInfo_errorCount_' . $name} < $requestInfo_errorCount) {
            # We set 0. Has reboot.
            $requestInfo_errorCount = 0;
        }

        my $time_delta = $new_datas->{last_timestamp} - $old_timestamp;
        if ($time_delta <= 0) {
            # At least one second. two fast calls ;)
            $time_delta = 1;
        }

        my $requestInfo_maxTime = $self->{result}->{$name}->{requestInfo_maxTime};

        my $requestInfo_processingTime_absolute_per_sec = ($new_datas->{'requestInfo_processingTime_' . $name} - $requestInfo_processingTime) / $time_delta;
        my $requestInfo_requestCount_absolute_per_sec = ($new_datas->{'requestInfo_requestCount_' . $name} - $requestInfo_requestCount) / $time_delta;
        my $requestInfo_errorCount_absolute_per_sec = ($new_datas->{'requestInfo_errorCount_' . $name} - $requestInfo_errorCount) / $time_delta;

        my $exit1 = $self->{perfdata}->threshold_check(value => $requestInfo_maxTime, threshold => [ { label => 'critical-maxtime', 'exit_litteral' => 'critical' }, { label => 'warning-maxtime', exit_litteral => 'warning' } ]);
        my $exit2 = $self->{perfdata}->threshold_check(value => $requestInfo_processingTime_absolute_per_sec, threshold => [ { label => 'critical-processingtime', 'exit_litteral' => 'critical' }, { label => 'warning-processingtime', exit_litteral => 'warning' } ]);
        my $exit3 = $self->{perfdata}->threshold_check(value => $requestInfo_requestCount_absolute_per_sec, threshold => [ { label => 'critical-requestcount', 'exit_litteral' => 'critical' }, { label => 'warning-requestcount', exit_litteral => 'warning' } ]);
        my $exit4 = $self->{perfdata}->threshold_check(value => $requestInfo_errorCount_absolute_per_sec, threshold => [ { label => 'critical-errorcount', 'exit_litteral' => 'critical' }, { label => 'warning-errorcount', exit_litteral => 'warning' } ]);
        my $exit = $self->{output}->get_most_critical(status => [ $exit1, $exit2, $exit3, $exit4 ]);

        $self->{output}->output_add(long_msg => sprintf("Connector '%s' maxTime : %s, processingTime : %.3f, requestCount : %.2f, errorCount : %.2f", $name, $requestInfo_maxTime, $requestInfo_processingTime_absolute_per_sec, $requestInfo_requestCount_absolute_per_sec, $requestInfo_errorCount_absolute_per_sec));
        if (!$self->{output}->is_status(value => $exit, compare => 'ok', litteral => 1) || (defined($self->{option_results}->{name}) && !defined($self->{option_results}->{use_regexp}))) {
            $self->{output}->output_add(severity => $exit,
                                        short_msg => sprintf("Connector '%s' maxTime : %s, processingTime : %.3f, requestCount : %.2f, errorCount : %.2f", $name,
                                       $requestInfo_maxTime,
                                       $requestInfo_processingTime_absolute_per_sec,
                                       $requestInfo_requestCount_absolute_per_sec,
                                       $requestInfo_errorCount_absolute_per_sec));
        }
        
        my $extra_label = '';
        $extra_label = '_' . $name if (!defined($self->{option_results}->{name}) || defined($self->{option_results}->{use_regexp}));
        $self->{output}->perfdata_add(label => 'maxTime' . $extra_label,
                                      value => sprintf("%.2f", $self->{result}->{$name}->{requestInfo_maxTime}),
                                      warning => $self->{perfdata}->get_perfdata_for_output(label => 'warning'),
                                      critical => $self->{perfdata}->get_perfdata_for_output(label => 'critical'),
                                      min => 0);

        $self->{output}->perfdata_add(label => 'processingTime' . $extra_label,
                                      value => sprintf("%.3f", $requestInfo_processingTime_absolute_per_sec),
                                      warning => $self->{perfdata}->get_perfdata_for_output(label => 'warning'),
                                      critical => $self->{perfdata}->get_perfdata_for_output(label => 'critical'),
                                      min => 0);

        $self->{output}->perfdata_add(label => 'requestCount' . $extra_label,
                                      value => sprintf("%.2f", $requestInfo_requestCount_absolute_per_sec),
                                      warning => $self->{perfdata}->get_perfdata_for_output(label => 'warning'),
                                      critical => $self->{perfdata}->get_perfdata_for_output(label => 'critical'),
                                      min => 0);
        $self->{output}->perfdata_add(label => 'errorCount' . $extra_label,
                                      value => sprintf("%.2f", $requestInfo_errorCount_absolute_per_sec),
                                      warning => $self->{perfdata}->get_perfdata_for_output(label => 'warning'),
                                      critical => $self->{perfdata}->get_perfdata_for_output(label => 'critical'),
                                      min => 0);
    };

    $self->{statefile_value}->write(data => $new_datas);    
    if (!defined($old_timestamp)) {
        $self->{output}->output_add(severity => 'OK',
                                    short_msg => "Buffer creation...");
    }

    $self->{output}->display();
    $self->{output}->exit();
};

1;

__END__

=head1 MODE

Check Tomcat Application Servers Requestinfo Threadsinformation for each Connector

=over 8

=item B<--hostname>

IP Address or FQDN of the Tomcat Application Server

=item B<--port>

Port used by Tomcat

=item B<--proxyurl>

Proxy URL if any

=item B<--proto>

Protocol used http or https

=item B<--credentials>

Specify this option if you access server-status page with authentication

=item B<--username>

Specify username for authentication (Mandatory if --credentials is specified)

=item B<--password>

Specify password for authentication (Mandatory if --credentials is specified)

=item B<--basic>

Specify this option if you access server-status page over basic authentication and don't want a '401 UNAUTHORIZED' error to be logged on your webserver.

Specify this option if you access server-status page over hidden basic authentication or you'll get a '404 NOT FOUND' error.

(Use with --credentials)

=item B<--timeout>

Threshold for HTTP timeout

=item B<--ssl-opt>

Set SSL Options (--ssl-opt="SSL_version => TLSv1" --ssl-opt="SSL_verify_mode => SSL_VERIFY_NONE").

=item B<--urlpath>

Path to the Tomcat Manager XML (Default: '/manager/status?XML=true')

=item B<--name>

Set the filter name (empty means 'check all contexts')

=item B<--regexp>

Allows to use regexp to filter (with option --name).

=item B<--regexp-isensitive>

Allows to use regexp non case-sensitive (with --regexp).

=item B<--warning-maxtime>

Threshold warning for maxTime

=item B<--critical-maxtime>

Threshold critical for maxTime

=item B<--warning-processingtime>

Threshold warning for ProcessingTime

=item B<--critical-processingtime>

Threshold critical for ProcessingTime

=item B<--warning-requestcount>

Threshold warning for requestCount

=item B<--critical-requestcount>

Threshold critical for requestCount

=item B<--warning-errorcount>

Threshold warning for errorCount

=item B<--critical-errorcount>

Threshold critical for errorCount

=back

=cut