Class: Ask::Providers::Bedrock

Inherits:
Ask::Provider
  • Object
show all
Includes:
LLM::ProviderConfig
Defined in:
lib/ask/provider/bedrock.rb

Overview

Amazon Bedrock provider using the Converse API. Uses the AWS SDK for authentication (credentials chain: env, ~/.aws, instance profile).

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ Bedrock

Returns a new instance of Bedrock.



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# File 'lib/ask/provider/bedrock.rb', line 10

def initialize(config = {})
  config = normalize_config(config)
  super(config)
end

Class Method Details

.capabilities ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 44

def capabilities
  { chat: true, streaming: true, tool_calls: true, vision: true }
end

.configuration_options ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 48

def configuration_options; %i[region access_key_id secret_access_key session_token]; end

.configuration_requirements ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 49

def configuration_requirements; %i[]; end

.slug ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 42

def slug; "bedrock"; end

Instance Method Details

#api_base ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 15

def api_base
  @config.region || "us-east-1"
end

#build_request(messages, model:, tools: nil, temperature: nil, stream: nil, schema: nil, **params) ⇒ Object

--- Config transformation contract ---



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# File 'lib/ask/provider/bedrock.rb', line 54

def build_request(messages, model:, tools: nil, temperature: nil, stream: nil, schema: nil, **params)
  system_msgs, chat_msgs = messages.partition { |m| (m[:role] || m["role"]).to_s == "system" }
  payload = {
    modelId: model,
    messages: chat_msgs.map { |m| format_message(m) },
    inferenceConfig: { temperature: temperature || 1.0 }.compact
  }

  sys = system_msgs.map { |m| m[:content] || m["content"] }.compact
  payload[:system] = sys.map { |s| { text: s } } if sys.any?
  tool_defs = format_tools(tools) if tools&.any?
  payload[:toolConfig] = { tools: tool_defs } if tool_defs
  if schema
    payload[:inferenceConfig][:response_type] = "json_object"
  end
  payload.merge(params)
end

#chat(messages, model:, tools: nil, temperature: nil, stream: nil, schema: nil, **params, &block) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 19

def chat(messages, model:, tools: nil, temperature: nil, stream: nil, schema: nil, **params, &block)
  msgs = messages.is_a?(Ask::Conversation) ? messages.to_a : messages
  payload = build_request(msgs, model:, tools:, temperature:, stream:, schema:, **params)
  if stream
    chat_stream(payload, model, &block)
  else
    chat_nonstream(payload, model)
  end
end

#embed(_texts, model: nil) ⇒ Object

Raises:

  • (Ask::CapabilityNotSupported) 


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# File 'lib/ask/provider/bedrock.rb', line 29

def embed(_texts, model: nil)
  raise Ask::CapabilityNotSupported, "Bedrock does not support embeddings via Converse API"
end

#format_message(msg) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 119

def format_message(msg)
  role = (msg[:role] || msg["role"]).to_s
  content = msg[:content] || msg["content"]
  bedrock_role = role == "assistant" ? "assistant" : "user"
  parts = []

  parts << { text: content } if content

  if msg[:tool_calls] || msg["tool_calls"]
    (msg[:tool_calls] || msg["tool_calls"]).each do |tc|
      parts << {
        toolUse: {
          toolUseId: tc[:id] || tc["id"],
          name: tc.dig(:function, :name) || tc.dig("function", "name") || tc[:name],
          input: parse_json(tc.dig(:function, :arguments) || tc.dig("function", "arguments") || tc[:arguments] || "{}")
        }
      }
    end
  end

  if msg[:tool_call_id] || msg["tool_call_id"]
    parts << {
      toolResult: {
        toolUseId: msg[:tool_call_id] || msg["tool_call_id"],
        content: [{ text: content || "" }]
      }
    }
    bedrock_role = "user"
  end

  { role: bedrock_role, content: parts }
end

#format_tools(tools) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 152

def format_tools(tools)
  tools.map do |t|
    {
      toolSpec: {
        name: t.respond_to?(:name) ? t.name : t[:name],
        description: t.respond_to?(:description) ? t.description : t[:description],
        inputSchema: {
          json: t.respond_to?(:parameters) ? t.parameters : (t[:parameters] || { type: "object", properties: {} })
        }
      }
    }
  end
end

#list_models ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 33

def list_models
  []
end

#parse_error(response) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 37

def parse_error(response)
  response.body["message"] rescue nil
end

#parse_response(body, model) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 72

def parse_response(body, model)
  output = body.output
  return Ask::Message.new(role: :assistant, content: nil) unless output

  msg = output.message
  text = msg.content&.map { |c| c.text }&.compact&.join
  tool_uses = msg.content&.select { |c| c.tool_use } || []
  tool_calls = tool_uses.map do |tu|
    { id: tu.tool_use.tool_use_id, type: "function", name: tu.tool_use.name, arguments: JSON.generate(tu.tool_use.input.to_h) }
  end

  usage = body.usage || {}
  Ask::Message.new(
    role: :assistant,
    content: text,
    tool_calls: tool_calls.empty? ? nil : tool_calls,
    metadata: {
      model:,
      stop_reason: body.stop_reason,
      input_tokens: usage.input_tokens,
      output_tokens: usage.output_tokens,
      raw: body.to_h
    }
  )
end

#parse_stream(raw, stream, model, &block) ⇒ Object 



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# File 'lib/ask/provider/bedrock.rb', line 98

def parse_stream(raw, stream, model, &block)
  event = raw
  if event.content_block_delta
    delta = event.content_block_delta.delta
    if delta.respond_to?(:text)
      chunk = Ask::Chunk.new(content: delta.text)
      stream.add(chunk)
      yield chunk if block_given?
    end
  end
  if event.message_stop
    usage = event.message_stop.usage || {}
    chunk = Ask::Chunk.new(
      finish_reason: "stop",
      usage: { input_tokens: usage.input_tokens, output_tokens: usage.output_tokens }
    )
    stream.add(chunk)
    yield chunk if block_given?
  end
end