Class: VSM::Drivers::Anthropic::AsyncDriver

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

Instance Method Summary collapse

Constructor Details

#initialize(api_key:, model:, base_url: "https://api.anthropic.com/v1", version: "2023-06-01") ⇒ AsyncDriver

Returns a new instance of AsyncDriver.



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# File 'lib/vsm/drivers/anthropic/async_driver.rb', line 11

def initialize(api_key:, model:, base_url: "https://api.anthropic.com/v1", version: "2023-06-01")
  @api_key, @model, @base, @version = api_key, model, base_url, version
end

Instance Method Details

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



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# File 'lib/vsm/drivers/anthropic/async_driver.rb', line 15

def run!(conversation:, tools:, policy: {}, &emit)
  # Always use Net::HTTP with SSE
  emitted_terminal = false

  headers = {
    "x-api-key" => @api_key,
    "anthropic-version" => @version,
    "content-type" => "application/json",
    "accept" => "text/event-stream"
  }

  messages  = to_anthropic_messages(conversation, policy[:system_prompt])
  tool_list = normalize_anthropic_tools(tools)
  payload = {
    model: @model,
    system: policy[:system_prompt],
    messages: messages,
    max_tokens: 512,
    stream: true
  }
  if tool_list.any?
    payload[:tools] = tool_list
    payload[:tool_choice] = { type: "auto" }
  end
  body = JSON.dump(payload)

  url = URI.parse("#{@base}/messages")
  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = (url.scheme == "https")
  http.read_timeout = 120

  req = Net::HTTP::Post.new(url.request_uri)
  headers.each { |k,v| req[k] = v }
  req.body = body

  res = http.request(req) do |response|
    ct = response["content-type"]
    if response.code.to_i != 200
      err_body = +""
      response.read_body { |chunk| err_body << chunk }
      preview = err_body.to_s.byteslice(0, 400)
      emit.call(:assistant_final, "Anthropic HTTP #{response.code}: #{preview}")
      emitted_terminal = true
      next
    end

    if ct && ct.include?("text/event-stream")
      buffer = +""
      textbuf = +""
      toolbuf = {}
      tool_calls = []

      response.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
          ev = obj["type"].to_s
          if ENV["VSM_DEBUG_STREAM"] == "1"
            $stderr.puts "anthropic(nethttp) <= #{ev}: #{data.byteslice(0, 160)}"
          end

          case ev
          when "content_block_delta"
            idx = obj["index"]; delta = obj["delta"] || {}
            case delta["type"]
            when "text_delta"
              part = delta["text"].to_s
              textbuf << part
              emit.call(:assistant_delta, part)
            when "input_json_delta"
              toolbuf[idx] ||= { id: nil, name: nil, json: +"" }
              toolbuf[idx][:json] << (delta["partial_json"] || "")
            end
          when "content_block_start"
            # For anthropic, the key can be 'content' or 'content_block'
            c = obj["content"] || obj["content_block"] || {}
            if c["type"] == "tool_use"
              name = c["name"] || obj["name"]
              toolbuf[obj["index"]] = { id: c["id"], name: name, json: +"" }
            end
          when "content_block_stop"
            idx = obj["index"]
            if tb = toolbuf[idx]
              args = tb[:json].empty? ? {} : (JSON.parse(tb[:json]) rescue {"_raw"=>tb[:json]})
              # Only enqueue if name is present
              if tb[:name].to_s.strip != "" && tb[:id]
                tool_calls << { id: tb[:id], name: tb[:name], arguments: args }
              end
            end
          when "message_stop"
            if tool_calls.any?
              emit.call(:tool_calls, tool_calls)
            else
              emit.call(:assistant_final, textbuf.dup)
            end
            emitted_terminal = true
          end
        end
      end

      unless emitted_terminal
        # If the stream closed without a terminal, emit final text
        emit.call(:assistant_final, textbuf)
        emitted_terminal = true
      end
    else
      # Non-streaming JSON
      data = ""
      response.read_body { |chunk| data << chunk }
      obj = JSON.parse(data) rescue {}
      parts = Array(obj.dig("content"))
      calls = []
      text  = +""
      parts.each do |p|
        case p["type"]
        when "text" then text << p["text"].to_s
        when "tool_use" then calls << { id: p["id"] || SecureRandom.uuid, name: p["name"], arguments: p["input"] || {} }
        end
      end
      if calls.any?
        emit.call(:tool_calls, calls)
      else
        emit.call(:assistant_final, text)
      end
      emitted_terminal = true
    end
  end

  :done
end