Class: VSM::Drivers::Gemini::AsyncDriver

Inherits:
Object
  • Object
show all
Defined in:
lib/vsm/drivers/gemini/async_driver.rb

Instance Method Summary collapse

Constructor Details

#initialize(api_key:, model:, base_url: "https://generativelanguage.googleapis.com/v1beta", streaming: true) ⇒ AsyncDriver

Returns a new instance of AsyncDriver.



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# File 'lib/vsm/drivers/gemini/async_driver.rb', line 12

def initialize(api_key:, model:, base_url: "https://generativelanguage.googleapis.com/v1beta", streaming: true)
  @api_key, @model, @base, @streaming = api_key, model, base_url, streaming
end

Instance Method Details

#run!(conversation:, tools:, policy: {}, &emit) ⇒ Object 



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# File 'lib/vsm/drivers/gemini/async_driver.rb', line 16

def run!(conversation:, tools:, policy: {}, &emit)
  contents = to_gemini_contents(conversation)
  fndecls  = normalize_gemini_tools(tools)
  if @streaming
    uri = URI.parse("#{@base}/models/#{@model}:streamGenerateContent?alt=sse&key=#{@api_key}")
    headers = { "content-type" => "application/json", "accept" => "text/event-stream" }
    body = JSON.dump({ contents: contents, system_instruction: (policy[:system_prompt] && { parts: [{ text: policy[:system_prompt] }], role: "user" }), tools: [{ functionDeclarations: fndecls }] })
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = (uri.scheme == "https")
    req = Net::HTTP::Post.new(uri.request_uri)
    headers.each { |k,v| req[k] = v }
    req.body = body
    http.request(req) do |res|
      if res.code.to_i != 200
        err = +""; res.read_body { |c| err << c }
        emit.call(:assistant_final, "Gemini HTTP #{res.code}: #{err.to_s.byteslice(0, 400)}")
        next
      end
      buffer = +""; text = +""; calls = []
      res.read_body do |chunk|
        buffer << chunk
        while (i = buffer.index("\n"))
          line = buffer.slice!(0..i)
          line.chomp!
          next unless line.start_with?("data:")
          data = line.sub("data:","").strip
          next if data.empty? || data == "[DONE]"
          obj = JSON.parse(data) rescue nil
          next unless obj
          parts = (obj.dig("candidates",0,"content","parts") || [])
          parts.each do |p|
            if (t = p["text"]) && !t.empty?
              text << t
              emit.call(:assistant_delta, t)
            end
            if (fc = p["functionCall"]) && fc["name"]
              calls << { id: SecureRandom.uuid, name: fc["name"], arguments: (fc["args"] || {}) }
            end
          end
        end
      end
      if calls.any?
        emit.call(:tool_calls, calls)
      else
        emit.call(:assistant_final, text)
      end
    end
  else
    uri = URI.parse("#{@base}/models/#{@model}:generateContent?key=#{@api_key}")
    headers = { "content-type" => "application/json" }
    body = JSON.dump({ contents: contents, system_instruction: (policy[:system_prompt] && { parts: [{ text: policy[:system_prompt] }], role: "user" }), tools: [{ functionDeclarations: fndecls }] })
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = (uri.scheme == "https")
    req = Net::HTTP::Post.new(uri.request_uri)
    headers.each { |k,v| req[k] = v }
    req.body = body
    res = http.request(req)
    if res.code.to_i != 200
      emit.call(:assistant_final, "Gemini HTTP #{res.code}")
    else
      data = JSON.parse(res.body) rescue {}
      parts = (data.dig("candidates",0,"content","parts") || [])
      calls = parts.filter_map { |p| fc = p["functionCall"]; fc && { id: SecureRandom.uuid, name: fc["name"], arguments: fc["args"] || {} } }
      if calls.any?
        emit.call(:tool_calls, calls)
      else
        text = parts.filter_map { |p| p["text"] }.join
        emit.call(:assistant_final, text.to_s)
      end
    end
  end
  :done
end