# OpenSearch::Client is an unofficial client for OpenSearch. 
# It is derived from Search::Elasticsearch version 7.714
# License details from that work are contained in the NOTICE
# file distributed with this work.
#-----------------------------------------------------------------------
# OpenSearch::Client
#-----------------------------------------------------------------------
# Copyright 2026 Mark Dootson
#
# 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 OpenSearch::Client::Transport;
$OpenSearch::Client::Transport::VERSION = '3.007002';
use Moo;

use URI();
use Time::HiRes qw(time);
use Try::Tiny;
use OpenSearch::Client::Util qw(upgrade_error);
use namespace::clean;

with 'OpenSearch::Client::Role::Is_Sync',
    'OpenSearch::Client::Role::Transport';

#===================================
sub perform_request {
#===================================
    my $self   = shift;
    my $params = $self->tidy_request(@_);
    my $pool   = $self->cxn_pool;
    my $logger = $self->logger;

    my ( $code, $response, $cxn, $error );

    try {
        $cxn = $pool->next_cxn;
        my $start = time();
        $logger->trace_request( $cxn, $params );

        ( $code, $response ) = $cxn->perform_request($params);
        $pool->request_ok($cxn);
        $logger->trace_response( $cxn, $code, $response, time() - $start );
    }
    catch {
        $error = upgrade_error(
            $_,
            {   request     => $params,
                status_code => $code,
                body        => $response
            }
        );
    };

    if ($error) {
        if ( $pool->request_failed( $cxn, $error ) ) {
            $logger->debugf( "[%s] %s", $cxn->stringify, "$error" );
            $logger->info('Retrying request on a new cxn');
            return $self->perform_request($params);
        }

        $logger->trace_error( $cxn, $error );
        $error->is('NoNodes')
            ? $logger->throw_critical($error)
            : $logger->throw_error($error);
    }

    return $response;
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

OpenSearch::Client::Transport - Provides interface between the client class and the OpenSearch cluster

=head1 VERSION

version 3.007002

=head1 DESCRIPTION

The Transport class manages the request cycle. It receives parsed requests
from the (user-facing) client class, and tries to execute the request on a
node in the cluster, retrying a request if necessary.

This class does L<OpenSearch::Client::Role::Transport> and
L<OpenSearch::Client::Role::Is_Sync>.

=head1 CONFIGURATION

=head2 C<send_get_body_as>

    $os = OpenSearch::Client->new(
        send_get_body_as => 'POST'
    );

Certain endpoints default to using a C<GET> method, even when they
include a request body.
Some proxy servers do not support C<GET> requests with a body.  To work
around this, the C<send_get_body_as>  parameter accepts the following:

=over

=item * C<GET>

Request bodies are sent as C<GET> requests.

=item * C<POST>

The method is changed to C<POST> when a body is present.

=item * C<source>

The body is encoded as JSON and added to the query string as the C<source>
parameter.  This has the advantage of still being a C<GET> request (for those
filtering on request method) but has the disadvantage of being restricted
in size.  The limit depends on the proxies between the client and
OpenSearch, but usually is around 4kB.

=back

=head1 METHODS

=head2 C<perform_request()>

Raw requests can be executed using the transport class as follows:

    $result = $os->transport->perform_request(
        method => 'POST',
        path   => '/_search',
        qs     => { from => 0, size => 10 },
        body   => {
            query => {
                match => {
                    title => "OpenSearch clients"
                }
            }
        }
    );

Other than the C<method>, C<path>, C<qs> and C<body> parameters, which
should be self-explanatory, it also accepts:

=over

=item C<ignore>

The HTTP error codes which should be ignored instead of throwing an error,
eg C<404 NOT FOUND>:

    $result = $os->transport->perform_request(
        method => 'GET',
        path   => '/index/type/id'
        ignore => [404],
    );

=item C<serialize>

Whether the C<body> should be serialized in the standard way (as plain
JSON) or using the special I<bulk> format:  C<"std"> or C<"bulk">.

=back

=head1 MANUAL

Documentation index L<OpenSearch::Client::Manual>

=head1 HISTORY

This distribution is derived from L<Search::Elasticsearch> version 7.714.
All subsequent changes are unique to this distribution.

=head1 AUTHOR

Mark Dootson E<lt>mdootson@cpan.orgE<gt> ( current maintainer )

=head1 CREDITS

L<OpenSearch::Client> is based on L<Search::Elasticsearch> version 7.714
by Enrico Zimuel E<lt>enrico.zimuel@elastic.coE<gt>.

=head1 COPYRIGHT AND LICENSE

Copyright (C) 2026 by Mark Dootson ( this distribution )

Copyright (C) 2021 by Elasticsearch BV ( original distribution ) 

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004


=cut

