Module: Intelligence::Anthropic::ChatMethods

Included in:
Adapter
Defined in:
lib/intelligence/adapters/anthropic/chat_methods.rb

Constant Summary collapse

CHAT_REQUEST_URI = 
"https://api.anthropic.com/v1/messages"

Instance Method Summary collapse

Instance Method Details

#chat_request_body(conversation, options = nil) ⇒ Object 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 30

def chat_request_body( conversation, options = nil )
  options = options ? self.class.configure( options ) : {}
  options = @options.merge( options )
  result = options[ :chat_options ]&.compact || {}

  system_message = translate_system_message( conversation[ :system_message ] )
  result[ :system ] = system_message unless system_message.nil?
  result[ :messages ] = []

  messages = conversation[ :messages ] 
  length = messages&.length || 0
  index = 0; while index < length 
    
    message = messages[ index ]
    unless message.nil?

      # The Anthropic API will not accept a sequence of messages where the role of two 
      # sequentian messages is the same.
      #
      # The purpose of this code is to identify such occurences and coalece them such 
      # that the first message in the sequence aggregates the contents of all subsequent
      # messages with the same role.
      look_ahead_index = index + 1; while look_ahead_index < length
        ahead_message = messages[ look_ahead_index ]
        unless ahead_message.nil?
          if ahead_message[ :role ] == message[ :role ]
            message[ :contents ] = 
              ( message[ :contents ] || [] ) + 
              ( ahead_message[ :contents ] || [] )
            messages[ look_ahead_index ] = nil 
            look_ahead_index += 1
          else 
            break
          end
        end
      end

      result_message = { role: message[ :role ] }
      result_message_content = []
      
      message[ :contents ]&.each do | content |
        case content[ :type ]
        when :text
          result_message_content << { type: 'text', text: content[ :text ] }
        when :binary
          content_type = content[ :content_type ]
          bytes = content[ :bytes ]
          if content_type && bytes
            mime_type = MIME::Types[ content_type ].first
            if mime_type&.media_type == 'image'
              result_message_content << {
                type: 'image',
                source: {
                  type: 'base64',
                  media_type: content_type,
                  data: Base64.strict_encode64( bytes )
                }
              }
            else
              raise UnsupportedContentError.new( 
                :anthropic, 
                'only support content of type image/*' 
              ) 
            end
          else 
            raise InvalidContentError.new( :anthropic ) 
          end
        end 
      end
      
      result_message[ :content ] = result_message_content
      result[ :messages ] << result_message
    
    end
  
    index += 1
  
  end

  JSON.generate( result )
end

#chat_request_headers(options = nil) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 11

def chat_request_headers( options = nil )
  options = options ? self.class.configure( options ) : {}
  options = @options.merge( options )
  result = {}

  key = options[ :key ] 
  version = options[ :version ] || "2023-06-01" 

  raise ArgumentError.new( 
    "An Anthropic key is required to build an Anthropic chat request." 
  ) if key.nil?

  result[ 'content-type' ] = 'application/json'
  result[ 'x-api-key' ] = "#{key}"
  result[ 'anthropic-version' ] = version unless version.nil?

  result 
end

#chat_request_uri(options) ⇒ Object 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 7

def chat_request_uri( options )
  CHAT_REQUEST_URI
end

#chat_result_attributes(response) ⇒ Object 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 112

def chat_result_attributes( response )
  return nil unless response.success?

  response_json = JSON.parse( response.body, symbolize_names: true ) rescue nil
  return nil if response_json.nil? 

  result = {}
  
  result_choice = { 
    end_reason: translate_end_result( response_json[ :stop_reason ] ),
    end_sequence: response_json[ :stop_sequence ], 
  }

  if response_json[ :content ] && 
     response_json[ :content ].is_a?( Array ) &&
     !response_json[ :content ].empty?

    result_content = []
    response_json[ :content ].each do | content |
      if content[ :type ] == 'text'
        result_content.push( { type: 'text', text: content[ :text ] } )
      end
    end

    unless result_content.empty?
      result_choice[ :message ] = {
        role: response_json[ :role ] || 'assistant',
        contents: result_content
      }
    end

  end

  result[ :choices ] = [ result_choice ]

  metrics_json = response_json[ :usage ]
  unless metrics_json.nil?

    result_metrics = {}
    result_metrics[ :input_tokens ] = metrics_json[ :input_tokens ] 
    result_metrics[ :output_tokens ] = metrics_json[ :output_tokens ]
    result_metrics = result_metrics.compact

    result[ :metrics ] = result_metrics unless result_metrics.empty?

  end

  result 
end

#chat_result_error_attributes(response) ⇒ Object Also known as: stream_result_error_attributes 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 162

def chat_result_error_attributes( response )
  error_type, error_description = translate_response_status( response.status )
  parsed_body = JSON.parse( response.body, symbolize_names: true ) rescue nil 
  if parsed_body && parsed_body.respond_to?( :include? ) && parsed_body.include?( :error )
    result = {
      error_type: error_type.to_s,
      error: parsed_body[ :error ][ :type ],
      error_description: parsed_body[ :error ][ :message ] || error_description
    }
  elsif 
    result = {
      error_type: error_type.to_s,
      error_description: error_description
    } 
  end
  result 
end

#stream_result_attributes(context) ⇒ Object 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 278

def stream_result_attributes( context )
  {
    choices: [ { 
      end_reason: translate_end_result( context[ :end_reason ] ),
      end_sequence: context[ :end_sequence ], 
    } ],
    metrics: context[ :metrics ]
  }
end

#stream_result_chunk_attributes(context, chunk) ⇒ Object 



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# File 'lib/intelligence/adapters/anthropic/chat_methods.rb', line 180

def stream_result_chunk_attributes( context, chunk )
  context ||= {}

  buffer = context[ :buffer ] || ''
  contents = context[ :contents ] || []    
  end_reason = context[ :end_reason ]
  end_sequence = context[ :end_sequence ]
  metrics = context[ :metrics ] || {
    input_tokens: 0,
    output_tokens:  0
  }

  contents.each do | content |
    case content[ :type ] 
      when :text 
        content[ :text ] = ''
      when :tool_call 
        content[ :tool_parameters ] = ''
      else 
        content.clear 
    end
  end

  buffer += chunk
  while ( eol_index = buffer.index( "\n" ) )
    
    line = buffer.slice!( 0..eol_index )
    line = line.strip 
    next if line.empty? || !line.start_with?( 'data:' )

    line = line[ 6..-1 ]
    data = JSON.parse( line )
    
    case data[ 'type' ]
      when 'message_start'
        metrics[ :input_tokens ] += data[ 'message' ]&.[]( 'usage' )&.[]( 'input_tokens' ) || 0
        metrics[ :output_tokens ] += data[ 'message' ]&.[]( 'usage' )&.[]( 'output_tokens' ) || 0
      when 'content_block_start'
        index = data[ 'index' ]
        contents.fill( {}, contents.size, index + 1 ) if contents.size <= index
        if content_block = data[ 'content_block' ]
          if content_block[ 'type' ] == 'text'
            contents[ index ] = {
              type: :text,
              text: content_block[ 'text' ] || '' 
            }
          elsif content_block[ 'type' ] == 'tool_use'
            contents[ index ] = {
              type: :tool_call,
              tool_name: content_block[ 'name' ],
              tool_call_id: content_block[ 'id' ],
              tool_parameters: ''
            }
          end
        end
      when 'content_block_delta'
        index = data[ 'index' ]
        contents.fill( {}, contents.size, index + 1 ) if contents.size <= index
        if delta = data[ 'delta' ]
          if delta[ 'type' ] == 'text_delta'
            contents[ index ][ :type ] = :text 
            contents[ index ][ :text ] = ( contents[ index ][ :text ] || '' ) + delta[ 'text' ]
          elsif delta[ 'type' ] == 'input_json_delta'
            contents[ index ][ :type ] = :tool_call 
            contents[ index ][ :tool_parameters ] = 
              ( contents[ index ][ :tool_parameters ] || '' ) + delta[ 'input_json_delta' ]                
          end
        end
      when 'message_delta'
        if delta = data[ 'delta' ]
          end_reason = delta[ 'stop_reason' ]
          end_sequence = delta[ 'stop_sequence' ]
        end
        metrics[ :output_tokens ] += data[ 'usage' ]&.[]( 'output_tokens' ) || 0
      when 'message_stop'
        
    end 
  end

  context = {
    buffer: buffer,
    contents: contents,
    end_reason: end_reason,
    end_sequence: end_sequence,
    metrics: metrics
  }
  choices = [ {
      end_reason: translate_end_result( end_reason ),
      end_sequence: end_sequence,
      message: {
        contents: contents.dup
      }
    }
  ]

  [ context, ( choices.empty? ? nil : { choices: choices } ) ]
end