Class: LlmGateway::Adapters::Anthropic::StreamMapper

Inherits:
StreamMapper show all
Defined in:
lib/llm_gateway/adapters/anthropic/stream_mapper.rb

Instance Method Summary collapse

Methods inherited from StreamMapper

#initialize, #result

Constructor Details

This class inherits a constructor from LlmGateway::Adapters::StreamMapper

Instance Method Details

#map(chunk, &block) ⇒ Object 



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# File 'lib/llm_gateway/adapters/anthropic/stream_mapper.rb', line 11

def map(chunk, &block)
  case chunk[:event]
  when "message_start"
    delta = {
      id: chunk.dig(:data, :message, :id),
      model: chunk.dig(:data, :message, :model),
      role: chunk.dig(:data, :message, :role)
    }
    accumulator.push({ type: :message_start, delta: }, &block)
  when "content_block_start"
    content_block = chunk.dig(:data, :content_block) || {}
    @current_content_block_type = normalize_content_block_type(content_block[:type])

    case @current_content_block_type
    when "thinking"
      accumulator.push({ type: :reasoning_start, delta: content_block[:thinking], signature: "" }, &block)
    when "text"
      accumulator.push({ type: :text_start, delta: content_block[:text] }, &block)
    when "tool_use", "server_tool_use"
      accumulator.push(
        {
          type: :tool_start,
          delta: "",
          id: content_block[:id],
          name: content_block[:name],
          tool_type: @current_content_block_type
        },
        &block
      )
    when "server_tool_result"
      content = content_block[:content]
      result_delta = content.nil? ? "" : JSON.generate(content)
      accumulator.push(
        {
          type: :tool_result_start,
          delta: result_delta,
          tool_use_id: content_block[:tool_use_id],
          name: content_block[:type]
        },
        &block
      )
    end
  when "content_block_delta"
    case @current_content_block_type
    when "thinking"
      delta = chunk.dig(:data, :delta, :thinking)
      signature = chunk.dig(:data, :delta, :signature) || ""
      accumulator.push({ type: :reasoning_delta, signature:, delta: }, &block)
    when "text"
      delta = chunk.dig(:data, :delta, :text)
      accumulator.push({ type: :text_delta, delta: }, &block)
    when "tool_use", "server_tool_use"
      delta = chunk.dig(:data, :delta, :partial_json)
      accumulator.push({ type: :tool_delta, delta: }, &block)
    when "server_tool_result"
      content = chunk.dig(:data, :delta, :content)
      result_delta = content.nil? ? "" : JSON.generate(content)
      accumulator.push({ type: :tool_result_delta, delta: result_delta }, &block)
    end
  when "content_block_stop"
    case @current_content_block_type
    when "thinking"
      accumulator.push({ type: :reasoning_end, delta: "", signature: "" }, &block)
    when "text"
      accumulator.push({ type: :text_end, delta: "" }, &block)
    when "tool_use", "server_tool_use"
      accumulator.push({ type: :tool_end, delta: "" }, &block)
    when "server_tool_result"
      accumulator.push({ type: :tool_result_end, delta: "" }, &block)
    end
    @current_content_block_type = nil
  when "message_delta"
    data = chunk[:data] || {}
    delta = normalize_message_delta(data[:delta] || {})
    patch = { type: :message_delta, delta: }
    patch[:usage] = normalized_usage(data[:usage]) if data.key?(:usage)

    accumulator.push(patch, &block)
  when "message_stop"

    accumulator.push({ type: :message_end }, &block)
  when "ping"
    nil
  when "error"
    raise_stream_error!(chunk.dig(:data, :error) || {}, overload_codes: [ "overloaded_error" ])
  end
end