Class: Langchain::Tool::GoogleSearch

Inherits:
Object
  • Object
show all
Extended by:
Langchain::ToolDefinition
Includes:
DependencyHelper
Defined in:
lib/langchain/tool/google_search.rb

Overview

Wrapper around SerpApi’s Google Search API

Gem requirements:

gem "google_search_results", "~> 2.0.0"

Usage:

search = Langchain::Tool::GoogleSearch.new(api_key: "YOUR_API_KEY")
search.execute(input: "What is the capital of France?")

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Langchain::ToolDefinition

define_function, function_schemas, tool_name

Methods included from DependencyHelper

#depends_on

Constructor Details

#initialize(api_key:) ⇒ Langchain::Tool::GoogleSearch

Initializes the Google Search tool

Parameters:

  • api_key (String) —

    Search API key



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# File 'lib/langchain/tool/google_search.rb', line 30

def initialize(api_key:)
  depends_on "google_search_results"

  @api_key = api_key
end

Instance Attribute Details

#api_key ⇒ Object (readonly)

Returns the value of attribute api_key.



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# File 'lib/langchain/tool/google_search.rb', line 22

def api_key
  @api_key
end

Instance Method Details

#execute(input:) ⇒ String

Executes Google Search and returns the result

Parameters:

  • input (String) —

    search query

Returns:

  • (String) —

    Answer



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# File 'lib/langchain/tool/google_search.rb', line 40

def execute(input:)
  Langchain.logger.debug("#{self.class} - Executing \"#{input}\"")

  results = execute_search(input: input)

  answer_box = results[:answer_box_list] ? results[:answer_box_list].first : results[:answer_box]
  if answer_box
    return answer_box[:result] ||
        answer_box[:answer] ||
        answer_box[:snippet] ||
        answer_box[:snippet_highlighted_words] ||
        answer_box.reject { |_k, v| v.is_a?(Hash) || v.is_a?(Array) || v.start_with?("http") }
  elsif (events_results = results[:events_results])
    return events_results.take(10)
  elsif (sports_results = results[:sports_results])
    return sports_results
  elsif (top_stories = results[:top_stories])
    return top_stories
  elsif (news_results = results[:news_results])
    return news_results
  elsif (jobs_results = results.dig(:jobs_results, :jobs))
    return jobs_results
  elsif (shopping_results = results[:shopping_results]) && shopping_results.first.key?(:title)
    return shopping_results.take(3)
  elsif (questions_and_answers = results[:questions_and_answers])
    return questions_and_answers
  elsif (popular_destinations = results.dig(:popular_destinations, :destinations))
    return popular_destinations
  elsif (top_sights = results.dig(:top_sights, :sights))
    return top_sights
  elsif (images_results = results[:images_results]) && images_results.first.key?(:thumbnail)
    return images_results.map { |h| h[:thumbnail] }.take(10)
  end

  snippets = []
  if (knowledge_graph = results[:knowledge_graph])
    snippets << knowledge_graph[:description] if knowledge_graph[:description]

    title = knowledge_graph[:title] || ""
    knowledge_graph.each do |k, v|
      if v.is_a?(String) &&
          k != :title &&
          k != :description &&
          !k.to_s.end_with?("_stick") &&
          !k.to_s.end_with?("_link") &&
          !k.to_s.start_with?("http")
        snippets << "#{title} #{k}: #{v}"
      end
    end
  end

  if (first_organic_result = results.dig(:organic_results, 0))
    if (snippet = first_organic_result[:snippet])
      snippets << snippet
    elsif (snippet_highlighted_words = first_organic_result[:snippet_highlighted_words])
      snippets << snippet_highlighted_words
    elsif (rich_snippet = first_organic_result[:rich_snippet])
      snippets << rich_snippet
    elsif (rich_snippet_table = first_organic_result[:rich_snippet_table])
      snippets << rich_snippet_table
    elsif (link = first_organic_result[:link])
      snippets << link
    end
  end

  if (buying_guide = results[:buying_guide])
    snippets << buying_guide
  end

  if (local_results = results.dig(:local_results, :places))
    snippets << local_results
  end

  return "No good search result found" if snippets.empty?
  snippets
end

#execute_search(input:) ⇒ Hash

Executes Google Search and returns hash_results JSON

Parameters:

  • input (String) —

    search query

Returns:

  • (Hash) —

    hash_results JSON



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# File 'lib/langchain/tool/google_search.rb', line 123

def execute_search(input:)
  ::GoogleSearch
    .new(q: input, serp_api_key: api_key)
    .get_hash
end