Class: Rager::Chat::Providers::Openai

Inherits:
Abstract
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/rager/chat/providers/openai.rb

Constant Summary collapse

OpenaiMessages = 
T.type_alias { T::Array[T::Hash[String, T.any(String, T::Array[T.untyped])]] }

Instance Method Summary collapse

Instance Method Details

#build_openai_messages(messages, history, system_prompt) ⇒ Object 



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# File 'lib/rager/chat/providers/openai.rb', line 89

def build_openai_messages(messages, history, system_prompt)
  result = T.let([], OpenaiMessages)

  if history.empty? && system_prompt && !system_prompt.empty?
    result << {"role" => "system",
                "content" => system_prompt}
  end

  history.each do |msg|
    role_str = msg.role.is_a?(String) ? msg.role : msg.role.serialize
    result << {"role" => role_str, "content" => msg.content}
  end

  messages.each do |message|
    role_str = message.role.is_a?(String) ? message.role : message.role.serialize
    content = message.content

    if content.is_a?(String)
      result << {"role" => role_str, "content" => content}
    elsif content.is_a?(Array)
      formatted_content = content.map do |item|
        item_type = item.type
        case item_type
        when Rager::Chat::MessageContentType::Text
          {"type" => "text", "text" => item.content}
        when Rager::Chat::MessageContentType::ImageUrl
          {"type" => "image_url", "image_url" => {"url" => item.content}}
        when Rager::Chat::MessageContentType::ImageBase64
          image_type = T.must(item.image_type)
          image_mime_type = case image_type
          when Rager::Chat::MessageContentImageType::Jpeg then "image/jpeg"
          when Rager::Chat::MessageContentImageType::Png then "image/png"
          when Rager::Chat::MessageContentImageType::Webp then "image/webp"
          end
          data_uri = "data:#{image_mime_type};base64,#{item.content}"
          {"type" => "image_url", "image_url" => {"url" => data_uri}}
        end
      end
      result << {"role" => role_str, "content" => formatted_content}
    end
  end

  result
end

#chat(messages, options) ⇒ Object

Raises:



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# File 'lib/rager/chat/providers/openai.rb', line 21

def chat(messages, options)
  api_key = options.api_key || ENV["OPENAI_API_KEY"]
  raise Rager::Errors::MissingCredentialsError.new("OpenAI", "OPENAI_API_KEY") if api_key.nil?

  url = options.url || ENV["OPENAI_URL"] || "https://api.openai.com/v1/chat/completions"
  model = options.model || "gpt-4o"

  openai_messages = build_openai_messages(messages, options.history, options.system_prompt)

  headers = {
    "Content-Type" => "application/json"
  }
  headers["Authorization"] = "Bearer #{api_key}" if api_key

  body = {
    model: model,
    messages: openai_messages
  }
  body[:temperature] = options.temperature unless options.temperature.nil?
  body[:n] = options.n unless options.n.nil?
  body[:stream] = options.stream unless options.stream.nil?
  body[:seed] = options.seed unless options.seed.nil?

  if options.schema && options.schema_name
    body[:response_format] = {
      type: "json_schema",
      json_schema: {
        name: T.must(options.schema_name).downcase,
        strict: true,
        schema: Rager::Chat::Schema.dry_schema_to_json_schema(T.must(options.schema))
      }
    }
  end

  request = Rager::Http::Request.new(
    verb: Rager::Http::Verb::Post,
    url: url,
    headers: headers,
    body: body.to_json
  )

  http_adapter = Rager.config.http_adapter
  response = http_adapter.make_request(request)
  response_body = T.must(response.body)

  if response.status != 200
    raise Rager::Errors::HttpError.new(
      http_adapter,
      response.status,
      T.cast(response_body, String)
    )
  end

  case response_body
  when String
    parse_non_stream_body(response_body)
  when Enumerator
    create_message_delta_stream(response_body)
  end
end

#create_message_delta_stream(body) ⇒ Object 



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# File 'lib/rager/chat/providers/openai.rb', line 157

def create_message_delta_stream(body)
  Enumerator.new do |yielder|
    buffer = +""

    process_chunk = lambda do |chunk|
      buffer << chunk
      pattern = /\Adata: (.*?)\n\n|\Adata: (.*?)\n/
      while (event_match = buffer.match(pattern))
        full_event = T.must(event_match[0])
        data_line = event_match[1] || event_match[2]

        buffer.delete_prefix!(full_event)

        next if data_line.nil? || data_line.strip.empty?
        next if data_line.strip == "[DONE]"

        begin
          data = JSON.parse(data_line)
          if data.key?("choices") && data["choices"].is_a?(Array)
            data["choices"].each do |choice|
              choice_index = choice.dig("index") || 0
              delta = choice.dig("delta", "content")
              yielder << Rager::Chat::MessageDelta.new(index: choice_index, content: delta) if delta
            end
          end
        rescue JSON::ParserError
          next
        end
      end
    end

    body.each(&process_chunk)

    process_chunk.call("\n") unless buffer.empty?
  end
end

#parse_non_stream_body(body) ⇒ Object 



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# File 'lib/rager/chat/providers/openai.rb', line 135

def parse_non_stream_body(body)
  messages = T.let([], T::Array[String])

  begin
    response_data = JSON.parse(body)
    if response_data.key?("choices") && response_data["choices"].is_a?(Array)
      response_data["choices"].each do |choice|
        text = choice.dig("message", "content").to_s
        messages << text unless text.empty?
      end
    end
  rescue JSON::ParserError
    raise Rager::Errors::ParseError.new(
      "OpenAI response body is not valid JSON",
      body
    )
  end

  messages
end