Class: AltText::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/alt_text/client.rb

Instance Method Summary collapse

Constructor Details

#initialize(access_key:, secret_key:, region:) ⇒ Client

Returns a new instance of Client.



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# File 'lib/alt_text/client.rb', line 9

def initialize(access_key:, secret_key:, region:)
  @client = Aws::BedrockRuntime::Client.new(
    access_key_id: access_key,
    secret_access_key: secret_key,
    region: region
  )
end

Instance Method Details

#process_image(image_path, prompt:, model_id:) ⇒ Object 



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# File 'lib/alt_text/client.rb', line 17

def process_image(image_path, prompt:, model_id:)
  model_id = AltText::LLMRegistry.resolve(model_id)
  image_format = image_format_for(image_path)
  tmp_image = resize_if_needed(image_path)

  image_bytes = File.binread(tmp_image)
  tmp_image.close! if tmp_image.is_a?(Tempfile)

  messages = [
    {
      role: 'user',
      content: [
        {
          image: {
            format: image_format,
            source: {
              bytes: image_bytes
            }
          }
        },
        {
          text: prompt
        }
      ]
    }
  ]

  # The `converse` method of the Bedrock Ruby SDK is used to interact with
  # LLM models in a standardized way, using a "messages" schema that supports
  # text, images, and tool calls. Unlike `invoke_model`, which requires
  # model-specific payloads.  Note that this prevents fine-grained control
  # of image processing parameters that some models may support.
  #
  # Examples of supported models:
  #   - Amazon Nova Pro (supports text and images)
  #   - Amazon Nova Lite (supports text and images)
  #   - Anthropic Claude / Opus (supports text and images)
  response = @client.converse(model_id: model_id,
                              messages: messages)

  response.output.message.content.first.text
end