Module: Langchain::DependencyHelper

Included in:
LLM::Base, Processors::Base, Tool::Calculator, Tool::Database, Tool::GoogleSearch, Tool::RubyCodeInterpreter, Tool::Wikipedia, Vectorsearch::Base
Defined in:
lib/langchain/dependency_helper.rb

Defined Under Namespace

Classes: LoadError, VersionError

Instance Method Summary collapse

Instance Method Details

#depends_on(gem_name, req: true) ⇒ Boolean

This method requires and loads the given gem, and then checks to see if the version of the gem meets the requirements listed in langchain.gemspec This solution was built to avoid auto-loading every single gem in the Gemfile when the developer will mostly likely be only using a few of them.

Parameters:

  • gem_name (String) —

    The name of the gem to load

Returns:

  • (Boolean) —

    Whether or not the gem was loaded successfully

Raises:

  • (LoadError) —

    If the gem is not installed

  • (VersionError) —

    If the gem is installed, but the version does not meet the requirements



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# File 'lib/langchain/dependency_helper.rb', line 17

def depends_on(gem_name, req: true)
  gem(gem_name) # require the gem

  return(true) unless defined?(Bundler) # If we're in a non-bundler environment, we're no longer able to determine if we'll meet requirements

  gem_version = Gem.loaded_specs[gem_name].version
  gem_requirement = Bundler.load.dependencies.find { |g| g.name == gem_name }&.requirement

  raise LoadError unless gem_requirement

  unless gem_requirement.satisfied_by?(gem_version)
    raise VersionError, "The #{gem_name} gem is installed, but version #{gem_requirement} is required. You have #{gem_version}."
  end

  lib_name = gem_name if req == true
  lib_name = req if req.is_a?(String)

  require(lib_name) if lib_name

  true
rescue ::LoadError
  raise LoadError, "Could not load #{gem_name}. Please ensure that the #{gem_name} gem is installed."
end