Get Feed Items Of Feed Item Set

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Java

// Copyright 2020 Google LLC
//
// 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
//
//     https://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 com.google.ads.googleads.examples.feeds;

import com.beust.jcommander.Parameter;
import com.google.ads.googleads.examples.utils.ArgumentNames;
import com.google.ads.googleads.examples.utils.CodeSampleParams;
import com.google.ads.googleads.lib.GoogleAdsClient;
import com.google.ads.googleads.v12.errors.GoogleAdsError;
import com.google.ads.googleads.v12.errors.GoogleAdsException;
import com.google.ads.googleads.v12.services.GoogleAdsRow;
import com.google.ads.googleads.v12.services.GoogleAdsServiceClient;
import com.google.ads.googleads.v12.services.SearchGoogleAdsStreamRequest;
import com.google.ads.googleads.v12.services.SearchGoogleAdsStreamResponse;
import com.google.ads.googleads.v12.utils.ResourceNames;
import com.google.api.gax.rpc.ServerStream;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * Gets all feed items of the specified feed item set by fetching all feed item set links. To create
 * a new feed item set, run CreateFeedItemSet.java. To link a feed item to a feed item set, run
 * LinkFeedItemSet.java.
 */
public class GetFeedItemsOfFeedItemSet {
  private static class GetFeedItemsOfFeedItemSetParams extends CodeSampleParams {

    @Parameter(names = ArgumentNames.CUSTOMER_ID, required = true)
    private long customerId;

    @Parameter(names = ArgumentNames.FEED_ID, required = true)
    private long feedId;

    @Parameter(names = ArgumentNames.FEED_ITEM_SET_ID, required = true)
    private long feedItemSetId;
  }

  public static void main(String[] args) {
    GetFeedItemsOfFeedItemSetParams params = new GetFeedItemsOfFeedItemSetParams();
    if (!params.parseArguments(args)) {

      // Either pass the required parameters for this example on the command line, or insert them
      // into the code here. See the parameter class definition above for descriptions.
      params.customerId = Long.parseLong("INSERT_CUSTOMER_ID_HERE");
      params.feedId = Long.parseLong("INSERT_FEED_ID_HERE");
      params.feedItemSetId = Long.parseLong("INSERT_FEED_ITEM_SET_ID_HERE");
    }

    GoogleAdsClient googleAdsClient = null;
    try {
      googleAdsClient = GoogleAdsClient.newBuilder().fromPropertiesFile().build();
    } catch (FileNotFoundException fnfe) {
      System.err.printf(
          "Failed to load GoogleAdsClient configuration from file. Exception: %s%n", fnfe);
      System.exit(1);
    } catch (IOException ioe) {
      System.err.printf("Failed to create GoogleAdsClient. Exception: %s%n", ioe);
      System.exit(1);
    }

    try {
      new GetFeedItemsOfFeedItemSet()
          .runExample(googleAdsClient, params.customerId, params.feedId, params.feedItemSetId);
    } catch (GoogleAdsException gae) {
      // GoogleAdsException is the base class for most exceptions thrown by an API request.
      // Instances of this exception have a message and a GoogleAdsFailure that contains a
      // collection of GoogleAdsErrors that indicate the underlying causes of the
      // GoogleAdsException.
      System.err.printf(
          "Request ID %s failed due to GoogleAdsException. Underlying errors:%n",
          gae.getRequestId());
      int i = 0;
      for (GoogleAdsError googleAdsError : gae.getGoogleAdsFailure().getErrorsList()) {
        System.err.printf("  Error %d: %s%n", i++, googleAdsError);
        System.exit(1);
      }
    }
  }

  /**
   * Runs the example.
   *
   * @param googleAdsClient the Google Ads API client.
   * @param customerId the customer ID.
   * @param feedId the feed ID.
   * @param feedItemSetId the feed item set ID.
   * @throws GoogleAdsException if an API request failed with one or more service errors.
   */
  private void runExample(
      GoogleAdsClient googleAdsClient, long customerId, long feedId, long feedItemSetId) {
    // Creates a query that retrieves all feed item set links associated with the specified feed
    // item set.
    String query =
        String.format(
            "SELECT feed_item_set_link.feed_item "
                + "FROM feed_item_set_link "
                + "WHERE feed_item_set_link.feed_item_set = '%s'",
            ResourceNames.feedItemSet(customerId, feedId, feedItemSetId));

    try (GoogleAdsServiceClient googleAdsServiceClient =
        googleAdsClient.getLatestVersion().createGoogleAdsServiceClient()) {
      // Constructs the SearchGoogleAdsStreamRequest.
      SearchGoogleAdsStreamRequest request =
          SearchGoogleAdsStreamRequest.newBuilder()
              .setCustomerId(Long.toString(customerId))
              .setQuery(query)
              .build();

      // Creates and issues a search Google Ads stream request.
      ServerStream<SearchGoogleAdsStreamResponse> stream =
          googleAdsServiceClient.searchStreamCallable().call(request);

      System.out.printf(
          "The feed items with the following resource names are linked with the feed "
              + "item set with ID %d:%n",
          feedItemSetId);

      // Iterates through and prints all of the results in the stream response.
      for (SearchGoogleAdsStreamResponse response : stream) {
        for (GoogleAdsRow googleAdsRow : response.getResultsList()) {
          System.out.printf("%s%n", googleAdsRow.getFeedItemSetLink());
        }
      }
    }
  }
}

      

C#

// Copyright 2020 Google LLC
//
// 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.

using CommandLine;
using Google.Ads.Gax.Examples;
using Google.Ads.GoogleAds.Lib;
using Google.Ads.GoogleAds.V12.Errors;
using Google.Ads.GoogleAds.V12.Services;
using System;
using System.Collections.Generic;

namespace Google.Ads.GoogleAds.Examples.V12
{
    /// <summary>
    /// This code example gets all feed items of the specified feed item set by fetching all feed
    /// item set links. To create a new feed item set, run CreateFeedItemSet.cs. To link a feed item
    /// to a feed item set, run LinkFeedItemSet.cs.
    /// </summary>
    public class GetFeedItemsOfFeedItemSet : ExampleBase
    {
        /// <summary>
        /// Command line options for running the <see cref="GetFeedItemsOfFeedItemSet"/> example.
        /// </summary>
        public class Options : OptionsBase
        {
            /// <summary>
            /// The Google Ads customer ID for which the call is made.
            /// </summary>
            [Option("customerId", Required = true, HelpText =
                "The Google Ads customer ID for which the call is made.")]
            public long CustomerId { get; set; }

            /// <summary>
            /// ID of the feed associated with the feed item set.
            /// </summary>
            [Option("feedId", Required = true, HelpText =
                "ID of the feed associated with the feed item set.")]
            public long FeedId { get; set; }

            /// <summary>
            /// ID of the feed item set.
            /// </summary>
            [Option("feedItemSetId", Required = true, HelpText =
                "ID of the feed item set.")]
            public long FeedItemSetId { get; set; }
        }

        /// <summary>
        /// Main method, to run this code example as a standalone application.
        /// </summary>
        /// <param name="args">The command line arguments.</param>
        public static void Main(string[] args)
        {
            Options options = ExampleUtilities.ParseCommandLine<Options>(args);

            GetFeedItemsOfFeedItemSet codeExample = new GetFeedItemsOfFeedItemSet();
            Console.WriteLine(codeExample.Description);
            codeExample.Run(new GoogleAdsClient(), options.CustomerId, options.FeedId,
                options.FeedItemSetId);
        }

        /// <summary>
        /// Returns a description about the code example.
        /// </summary>
        public override string Description => "This code example gets all feed items of the " +
            "specified feed item set by fetching all feed item set links. To create a new feed " +
            "item set, run CreateFeedItemSet.cs. To link a feed item to a feed item set, " +
            "run LinkFeedItemSet.cs.";

        /// <summary>
        /// Runs the code example.
        /// </summary>
        /// <param name="client">The Google Ads API client.</param>
        /// <param name="customerId">The Google Ads customer ID for which the call is made.</param>
        /// <param name="feedId">ID of the feed associated with the feed item set.</param>
        /// <param name="feedItemSetId">ID of the feed item set.</param>
        public void Run(GoogleAdsClient client, long customerId, long feedId, long feedItemSetId)
        {
            // Get the GoogleAdsService.
            GoogleAdsServiceClient googleAdsService = client.GetService(
                Services.V12.GoogleAdsService);

            string feedItemSetResourceName = ResourceNames.FeedItemSet(
                customerId, feedId, feedItemSetId);

            // Creates a query that retrieves all feed item set links associated with the specified
            // feed item set.
            string query = $@"
                SELECT
                    feed_item_set_link.feed_item
                FROM
                    feed_item_set_link
                WHERE
                    feed_item_set_link.feed_item_set = '{feedItemSetResourceName}'";

            try
            {
                Console.WriteLine("The feed items with the following resource names are linked " +
                    $"with the feed item set with ID {feedItemSetId}:");

                // Issue a search request.
                googleAdsService.SearchStream(customerId.ToString(), query,
                    delegate (SearchGoogleAdsStreamResponse resp)
                    {
                        foreach (GoogleAdsRow googleAdsRow in resp.Results)
                        {
                            Console.WriteLine(googleAdsRow.FeedItemSetLink.FeedItem);
                        }
                    }
                );
            }
            catch (GoogleAdsException e)
            {
                Console.WriteLine("Failure:");
                Console.WriteLine($"Message: {e.Message}");
                Console.WriteLine($"Failure: {e.Failure}");
                Console.WriteLine($"Request ID: {e.RequestId}");
                throw;
            }
        }
    }
}

      

PHP

<?php

/**
 * Copyright 2020 Google LLC
 *
 * 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
 *
 *     https://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.
 */

namespace Google\Ads\GoogleAds\Examples\Feeds;

require __DIR__ . '/../../vendor/autoload.php';

use GetOpt\GetOpt;
use Google\Ads\GoogleAds\Examples\Utils\ArgumentNames;
use Google\Ads\GoogleAds\Examples\Utils\ArgumentParser;
use Google\Ads\GoogleAds\Lib\V12\GoogleAdsClient;
use Google\Ads\GoogleAds\Lib\V12\GoogleAdsClientBuilder;
use Google\Ads\GoogleAds\Lib\V12\GoogleAdsException;
use Google\Ads\GoogleAds\Lib\OAuth2TokenBuilder;
use Google\Ads\GoogleAds\Lib\V12\GoogleAdsServerStreamDecorator;
use Google\Ads\GoogleAds\Util\V12\ResourceNames;
use Google\Ads\GoogleAds\V12\Errors\GoogleAdsError;
use Google\Ads\GoogleAds\V12\Services\GoogleAdsRow;
use Google\ApiCore\ApiException;

/**
 * This example gets all feed items of the specified feed item set by fetching all feed item set
 * links. To create a new feed item set, run CreateFeedItemSet.php. To link a feed item to a feed
 * item set, run LinkFeedItemSet.php.
 */
class GetFeedItemsOfFeedItemSet
{
    private const CUSTOMER_ID = 'INSERT_CUSTOMER_ID_HERE';
    private const FEED_ID = 'INSERT_FEED_ID_HERE';
    private const FEED_ITEM_SET_ID = 'INSERT_FEED_ITEM_SET_ID_HERE';

    public static function main()
    {
        // Either pass the required parameters for this example on the command line, or insert them
        // into the constants above.
        $options = (new ArgumentParser())->parseCommandArguments([
            ArgumentNames::CUSTOMER_ID => GetOpt::REQUIRED_ARGUMENT,
            ArgumentNames::FEED_ID => GetOpt::REQUIRED_ARGUMENT,
            ArgumentNames::FEED_ITEM_SET_ID => GetOpt::REQUIRED_ARGUMENT
        ]);

        // Generate a refreshable OAuth2 credential for authentication.
        $oAuth2Credential = (new OAuth2TokenBuilder())->fromFile()->build();

        // Construct a Google Ads client configured from a properties file and the
        // OAuth2 credentials above.
        $googleAdsClient = (new GoogleAdsClientBuilder())
            ->fromFile()
            ->withOAuth2Credential($oAuth2Credential)
            ->build();

        try {
            self::runExample(
                $googleAdsClient,
                $options[ArgumentNames::CUSTOMER_ID] ?: self::CUSTOMER_ID,
                $options[ArgumentNames::FEED_ID] ?: self::FEED_ID,
                $options[ArgumentNames::FEED_ITEM_SET_ID] ?: self::FEED_ITEM_SET_ID
            );
        } catch (GoogleAdsException $googleAdsException) {
            printf(
                "Request with ID '%s' has failed.%sGoogle Ads failure details:%s",
                $googleAdsException->getRequestId(),
                PHP_EOL,
                PHP_EOL
            );
            foreach ($googleAdsException->getGoogleAdsFailure()->getErrors() as $error) {
                /** @var GoogleAdsError $error */
                printf(
                    "\t%s: %s%s",
                    $error->getErrorCode()->getErrorCode(),
                    $error->getMessage(),
                    PHP_EOL
                );
            }
            exit(1);
        } catch (ApiException $apiException) {
            printf(
                "ApiException was thrown with message '%s'.%s",
                $apiException->getMessage(),
                PHP_EOL
            );
            exit(1);
        }
    }

    /**
     * Runs the example.
     *
     * @param GoogleAdsClient $googleAdsClient the Google Ads API client
     * @param int $customerId the customer ID
     * @param int $feedId the feed ID that the specified feed item set is associated with
     * @param int $feedItemSetId the ID of specified feed item set
     */
    public static function runExample(
        GoogleAdsClient $googleAdsClient,
        int $customerId,
        int $feedId,
        int $feedItemSetId
    ) {
        $googleAdsServiceClient = $googleAdsClient->getGoogleAdsServiceClient();
        // Creates a query that retrieves all feed item set links associated with the specified feed
        // item set.
        $query = sprintf(
            "SELECT feed_item_set_link.feed_item FROM feed_item_set_link "
            . "WHERE feed_item_set_link.feed_item_set = '%s'",
            ResourceNames::forFeedItemSet($customerId, $feedId, $feedItemSetId)
        );

        // Issues a search stream request.
        /** @var GoogleAdsServerStreamDecorator $stream */
        $stream = $googleAdsServiceClient->searchStream($customerId, $query);

        printf(
            "The feed items with the following resource names are linked with the feed item set "
            . "with ID %d:%s",
            $feedItemSetId,
            PHP_EOL
        );
        // Iterates over all rows in all messages and prints the requested field values for
        // the feed item set link in each row.
        foreach ($stream->iterateAllElements() as $googleAdsRow) {
            /** @var GoogleAdsRow $googleAdsRow */
            printf("'%s'%s", $googleAdsRow->getFeedItemSetLink()->getFeedItem(), PHP_EOL);
        }
    }
}

GetFeedItemsOfFeedItemSet::main();

      

Python

#!/usr/bin/env python
# Copyright 2020 Google LLC
#
# 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
#
#     https://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.
"""This example gets all feed items of the specified feed item set.

To create a new feed item set, run create_feed_item_set.py.
To link a feed item to a feed item set, run link_feed_item_set.py.
"""


import argparse
import sys

from google.ads.googleads.client import GoogleAdsClient
from google.ads.googleads.errors import GoogleAdsException


def main(client, customer_id, feed_id, feed_item_set_id):
    """The main method that creates all necessary entities for the example.

    Args:
        client: an initialized GoogleAdsClient instance.
        customer_id: a client customer ID.
        feed_id: the ID for a Feed belonging to the given customer.
        feed_item_set_id: the ID for a FeedItemSet belonging to the given
            customer.
    """
    ga_service = client.get_service("GoogleAdsService")
    feed_item_set_service = client.get_service("FeedItemSetService")

    feed_item_set_path = feed_item_set_service.feed_item_set_path(
        customer_id, feed_id, feed_item_set_id
    )
    query = f"""
        SELECT
          feed_item_set_link.feed_item
        FROM feed_item_set_link
        WHERE feed_item_set_link.feed_item_set = '{feed_item_set_path}'"""

    # Issues a search request using streaming.
    search_request = client.get_type("SearchGoogleAdsStreamRequest")
    search_request.customer_id = customer_id
    search_request.query = query
    stream = ga_service.search_stream(request=search_request)

    print(
        "The feed items with the following resource names are linked with "
        f"the feed item set with ID {feed_item_set_id}:"
    )
    for batch in stream:
        for row in batch.results:
            print(f"'{row.feed_item_set_link.feed_item}'")


if __name__ == "__main__":
    # GoogleAdsClient will read the google-ads.yaml configuration file in the
    # home directory if none is specified.
    googleads_client = GoogleAdsClient.load_from_storage(version="v12")

    parser = argparse.ArgumentParser(
        description="Gets all feed items of the specified feed item set."
    )
    # The following argument(s) should be provided to run the example.
    parser.add_argument(
        "-c",
        "--customer_id",
        type=str,
        required=True,
        help="The Google Ads customer ID.",
    )
    parser.add_argument(
        "-i",
        "--feed_id",
        type=str,
        required=True,
        help="The Feed ID.",
    )
    parser.add_argument(
        "-s",
        "--feed_item_set_id",
        type=str,
        required=True,
        help="The Feed Item Set ID.",
    )
    args = parser.parse_args()

    try:
        main(
            googleads_client,
            args.customer_id,
            args.feed_id,
            args.feed_item_set_id,
        )
    except GoogleAdsException as ex:
        print(
            f'Request with ID "{ex.request_id}" failed with status '
            f'"{ex.error.code().name}" and includes the following errors:'
        )
        for error in ex.failure.errors:
            print(f'\tError with message "{error.message}".')
            if error.location:
                for field_path_element in error.location.field_path_elements:
                    print(f"\t\tOn field: {field_path_element.field_name}")
        sys.exit(1)

      

Ruby

#!/usr/bin/env ruby
# Encoding: utf-8
#
# Copyright 2020 Google LLC
#
# 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
#
#     https://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.
#
# This example gets all feed items of the specified feed item set by fetching
# all feed item set links. To create a new feed item set, run
# create_feed_item_set.rb. To link a feed item to a feed item set, run
# link_feed_item_set.rb.

require 'optparse'
require 'google/ads/google_ads'

def get_feed_items_of_feed_item_set(customer_id, feed_id, feed_item_set_id)
  # GoogleAdsClient will read a config file from
  # ENV['HOME']/google_ads_config.rb when called without parameters
  client = Google::Ads::GoogleAds::GoogleAdsClient.new

  query = <<~QUERY
    SELECT feed_item_set_link.feed_item
    FROM feed_item_set_link
    WHERE feed_item_set_link.feed_item_set =
        '#{client.path.feed_item_set(customer_id, feed_id, feed_item_set_id)}'
  QUERY

  responses = client.service.google_ads.search_stream(
    customer_id: customer_id,
    query: query,
  )

  puts "The feed items with the following resource names are linked to feed item " \
    "set with ID #{feed_item_set_id}."
  responses.each do |response|
    response.results.each do |row|
      puts "\t#{row.feed_item_set_link.feed_item}"
    end
  end
end

if __FILE__ == $0
  options = {}

  # The following parameter(s) should be provided to run the example. You can
  # either specify these by changing the INSERT_XXX_ID_HERE values below, or on
  # the command line.
  #
  # Parameters passed on the command line will override any parameters set in
  # code.
  #
  # Running the example with -h will print the command line usage.
  options[:customer_id] = 'INSERT_CUSTOMER_ID_HERE'
  options[:feed_id] = 'INSERT_FEED_ID_HERE'
  options[:feed_item_set_id] = 'INSERT_FEED_ITEM_SET_ID_HERE'

  OptionParser.new do |opts|
    opts.banner = sprintf('Usage: %s [options]', File.basename(__FILE__))

    opts.separator ''
    opts.separator 'Options:'

    opts.on('-C', '--customer-id CUSTOMER-ID', String, 'Customer ID') do |v|
      options[:customer_id] = v
    end

    opts.on('-F', '--feed-id FEED-ID', String, 'Feed ID') do |v|
      options[:feed_id] = v
    end

    opts.on('-s', '--feed-item-set-id FEED-ITEM-SET-ID', String, 'Feed Item Set ID') do |v|
      options[:feed_item_set_id] = v
    end

    opts.separator ''
    opts.separator 'Help:'

    opts.on_tail('-h', '--help', 'Show this message') do
      puts opts
      exit
    end
  end.parse!

  begin
    get_feed_items_of_feed_item_set(
      options.fetch(:customer_id).tr("-", ""),
      options.fetch(:feed_id),
      options.fetch(:feed_item_set_id),
    )
  rescue Google::Ads::GoogleAds::Errors::GoogleAdsError => e
    e.failure.errors.each do |error|
      STDERR.printf("Error with message: %s\n", error.message)
      if error.location
        error.location.field_path_elements.each do |field_path_element|
          STDERR.printf("\tOn field: %s\n", field_path_element.field_name)
        end
      end
      error.error_code.to_h.each do |k, v|
        next if v == :UNSPECIFIED
        STDERR.printf("\tType: %s\n\tCode: %s\n", k, v)
      end
    end
    raise
  end
end

      

Perl

#!/usr/bin/perl -w
#
# Copyright 2020, Google LLC
#
# 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.
#
# This example gets all feed items of the specified feed item set by fetching all
# feed item set links. To create a new feed item set, run create_feed_item_set.pl.
# To link a feed item to a feed item set, run link_feed_item_set.pl.

use strict;
use warnings;
use utf8;

use FindBin qw($Bin);
use lib "$Bin/../../lib";
use Google::Ads::GoogleAds::Client;
use Google::Ads::GoogleAds::Utils::GoogleAdsHelper;
use Google::Ads::GoogleAds::Utils::SearchStreamHandler;
use
  Google::Ads::GoogleAds::V12::Services::GoogleAdsService::SearchGoogleAdsStreamRequest;
use Google::Ads::GoogleAds::V12::Utils::ResourceNames;

use Getopt::Long qw(:config auto_help);
use Pod::Usage;
use Cwd qw(abs_path);

# The following parameter(s) should be provided to run the example. You can
# either specify these by changing the INSERT_XXX_ID_HERE values below, or on
# the command line.
#
# Parameters passed on the command line will override any parameters set in
# code.
#
# Running the example with -h will print the command line usage.
my $customer_id      = "INSERT_CUSTOMER_ID_HERE";
my $feed_id          = "INSERT_FEED_ID_HERE";
my $feed_item_set_id = "INSERT_FEED_ITEM_SET_ID_HERE";

sub get_feed_items_of_feed_item_set {
  my ($api_client, $customer_id, $feed_id, $feed_item_set_id) = @_;

  # Create a query that retrieves all feed item set links associated with the
  # specified feed item set.
  my $search_query =
    sprintf "SELECT feed_item_set_link.feed_item FROM feed_item_set_link " .
    "WHERE feed_item_set_link.feed_item_set = '%s'",
    Google::Ads::GoogleAds::V12::Utils::ResourceNames::feed_item_set(
    $customer_id, $feed_id, $feed_item_set_id);

  # Create a search Google Ads stream request that will retrieve the feed item set links.
  my $search_stream_request =
    Google::Ads::GoogleAds::V12::Services::GoogleAdsService::SearchGoogleAdsStreamRequest
    ->new({
      customerId => $customer_id,
      query      => $search_query
    });

  # Get the GoogleAdsService.
  my $google_ads_service = $api_client->GoogleAdsService();

  my $search_stream_handler =
    Google::Ads::GoogleAds::Utils::SearchStreamHandler->new({
      service => $google_ads_service,
      request => $search_stream_request
    });

  printf "The feed items with the following resource names are linked with " .
    "the feed item set with ID %d:\n",
    $feed_item_set_id;

  # Iterate over all rows in all messages and print the requested field values
  # for the feed item set link in each row.
  $search_stream_handler->process_contents(
    sub {
      my $google_ads_row = shift;
      printf "'%s'\n", $google_ads_row->{feedItemSetLink}{feedItem};
    });

  return 1;
}

# Don't run the example if the file is being included.
if (abs_path($0) ne abs_path(__FILE__)) {
  return 1;
}

# Get Google Ads Client, credentials will be read from ~/googleads.properties.
my $api_client = Google::Ads::GoogleAds::Client->new();

# By default examples are set to die on any server returned fault.
$api_client->set_die_on_faults(1);

# Parameters passed on the command line will override any parameters set in code.
GetOptions(
  "customer_id=s"      => \$customer_id,
  "feed_id=i"          => \$feed_id,
  "feed_item_set_id=i" => \$feed_item_set_id
);

# Print the help message if the parameters are not initialized in the code nor
# in the command line.
pod2usage(2) if not check_params($customer_id, $feed_id, $feed_item_set_id);

# Call the example.
get_feed_items_of_feed_item_set($api_client, $customer_id =~ s/-//gr,
  $feed_id, $feed_item_set_id);

=pod

=head1 NAME

get_feed_items_of_feed_item_set

=head1 DESCRIPTION

This example gets all feed items of the specified feed item set by fetching all
feed item set links. To create a new feed item set, run create_feed_item_set.pl.
To link a feed item to a feed item set, run link_feed_item_set.pl.

=head1 SYNOPSIS

get_feed_items_of_feed_item_set.pl [options]

    -help                       Show the help message.
    -customer_id                The Google Ads customer ID.
    -feed_id                    The feed ID that the specified feed item set is
                                associated with.
    -feed_item_set_id           The ID of specified feed item set.

=cut