Module: Kward::ModelStreamParser

Defined in:
lib/kward/model/stream_parser.rb

Class Method Summary collapse

Class Method Details

.codex_sse_error(event, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 132

def codex_sse_error(event, request_error_class: nil)
  response = event["response"]
  error = event["error"] || (response["error"] if response.is_a?(Hash)) || {}
  message = if error.is_a?(Hash)
              [error["code"], error["message"]].compact.join(": ")
            else
              error.to_s
            end
  message = event["type"].to_s if message.empty?
  code = error.is_a?(Hash) && error["code"].to_s == "server_error" ? 500 : 400
  if request_error_class
    request_error_class.new(provider: "Codex", code: code, body: "#{event["type"]}: #{message}")
  else
    "#{event["type"]}: #{message}"
  end
end

.codex_sse_message(state) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 149

def codex_sse_message(state)
  if state[:tool_calls].empty?
    state[:final_output].each do |item|
      tool_call = codex_tool_call(item)
      state[:tool_calls] << tool_call if tool_call
    end
  end

  message = { "role" => "assistant", "content" => state[:content] }
  message["reasoning_summary"] = state[:reasoning_summary] unless state[:reasoning_summary].empty?
  message["tool_calls"] = state[:tool_calls] unless state[:tool_calls].empty?
  message["usage"] = state[:usage] if state[:usage]
  message
end

.codex_sse_state ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 91

def codex_sse_state
  { content: +"", reasoning_summary: +"", tool_calls: [], final_output: [], usage: nil }
end

.codex_tool_call(item) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 164

def codex_tool_call(item)
  return nil unless item.is_a?(Hash) && ["function_call", "custom_tool_call"].include?(item["type"])

  name = item["name"].to_s
  return nil if name.empty?

  arguments = item["arguments"] || item["input"] || "{}"
  arguments = JSON.dump(arguments) unless arguments.is_a?(String)
  {
    "id" => (item["call_id"] || item["id"] || "call_#{name}"),
    "type" => "function",
    "function" => { "name" => name, "arguments" => arguments }
  }
end

.finalized_streaming_tool_calls(tool_calls) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 81

def finalized_streaming_tool_calls(tool_calls)
  tool_calls.compact.each_with_index.map do |tool_call, index|
    tool_call["id"] ||= "call_#{index}"
    tool_call["type"] ||= "function"
    tool_call["function"] ||= { "name" => "", "arguments" => "{}" }
    tool_call["function"]["arguments"] = "{}" if tool_call["function"]["arguments"].to_s.empty?
    tool_call
  end
end

.merge_streaming_tool_call(tool_calls, delta) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 70

def merge_streaming_tool_call(tool_calls, delta)
  index = (delta["index"] || tool_calls.length).to_i
  tool_calls[index] ||= { "id" => nil, "type" => "function", "function" => { "name" => "", "arguments" => "" } }
  current = tool_calls[index]
  current["id"] = delta["id"] if delta["id"]
  current["type"] = delta["type"] if delta["type"]
  function = delta["function"] || {}
  current["function"]["name"] << function["name"].to_s if function["name"]
  current["function"]["arguments"] << function["arguments"].to_s if function["arguments"]
end

.parse_codex_sse(body, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 39

def parse_codex_sse(body, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil)
  state = codex_sse_state
  body.split(/\r?\n\r?\n/).each do |block|
    process_codex_sse_block(block, state, on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class)
  end
  codex_sse_message(state)
rescue JSON::ParserError => e
  raise "Codex OAuth returned invalid SSE JSON: #{e.message}"
end

.parse_codex_sse_stream(response, on_reasoning_delta: nil, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 49

def parse_codex_sse_stream(response, on_reasoning_delta: nil, on_assistant_delta: nil, cancellation: nil, usage_normalizer: nil, request_error_class: nil)
  state = codex_sse_state
  buffer = +""

  response.read_body do |chunk|
    cancellation&.raise_if_cancelled!
    buffer << chunk
    while (index = buffer.index(/\r?\n\r?\n/))
      delimiter = Regexp.last_match[0]
      block = buffer[0...index]
      buffer = buffer[(index + delimiter.length)..] || +""
      process_codex_sse_block(block, state, on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class)
    end
  end
  cancellation&.raise_if_cancelled!
  process_codex_sse_block(buffer, state, on_reasoning_delta: on_reasoning_delta, on_assistant_delta: on_assistant_delta, usage_normalizer: usage_normalizer, request_error_class: request_error_class) unless buffer.empty?
  codex_sse_message(state)
rescue JSON::ParserError => e
  raise "Codex OAuth returned invalid SSE JSON: #{e.message}"
end

.parse_openai_chat_sse(body, on_assistant_delta: nil, usage_normalizer: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 7

def parse_openai_chat_sse(body, on_assistant_delta: nil, usage_normalizer: nil)
  content = +""
  tool_calls = []
  usage = nil
  body.split(/\r?\n\r?\n/).each do |block|
    data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
    next if data.empty? || data == "[DONE]"

    event = JSON.parse(data)
    usage ||= usage_normalizer&.call(event["usage"])
    choice = Array(event["choices"]).first || {}
    delta = choice["delta"] || {}
    if delta["content"]
      text = delta["content"].to_s
      content << text
      on_assistant_delta&.call(text)
    end
    Array(delta["tool_calls"]).each do |tool_call|
      merge_streaming_tool_call(tool_calls, tool_call)
    end
    message = choice["message"] || {}
    content << message["content"].to_s if content.empty? && message["content"]
    Array(message["tool_calls"]).each { |tool_call| merge_streaming_tool_call(tool_calls, tool_call) }
  end
  result = { "role" => "assistant", "content" => content }
  result["tool_calls"] = finalized_streaming_tool_calls(tool_calls) unless tool_calls.empty?
  result["usage"] = usage if usage
  result
rescue JSON::ParserError => e
  raise "Copilot returned invalid SSE JSON: #{e.message}"
end

.process_codex_sse_block(block, state, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 95

def process_codex_sse_block(block, state, on_reasoning_delta: nil, on_assistant_delta: nil, usage_normalizer: nil, request_error_class: nil)
  data = block.lines.filter_map { |line| line.start_with?("data:") ? line.delete_prefix("data:").strip : nil }.join("\n")
  return if data.empty? || data == "[DONE]"

  event = JSON.parse(data)
  case event["type"]
  when "response.output_text.delta"
    delta = event["delta"].to_s
    state[:content] << delta
    on_assistant_delta&.call(delta)
  when "response.reasoning_summary_text.delta"
    delta = event["delta"].to_s
    state[:reasoning_summary] << delta
    on_reasoning_delta&.call(delta)
  when "response.output_item.done"
    item = event["item"]
    state[:final_output] << item if item.is_a?(Hash)
    tool_call = codex_tool_call(item)
    state[:tool_calls] << tool_call if tool_call
  when "response.completed"
    response = event["response"]
    state[:usage] ||= usage_normalizer&.call(response["usage"]) if response.is_a?(Hash)
    state[:usage] ||= usage_normalizer&.call(event["usage"])
    if state[:content].empty? && response.is_a?(Hash) && response["output"].is_a?(Array)
      state[:final_output] = response["output"]
      text = text_from_codex_items(state[:final_output])
      state[:content] << text
      on_assistant_delta&.call(text) unless text.empty?
      if state[:reasoning_summary].empty?
        state[:reasoning_summary] << reasoning_summary_from_codex_items(state[:final_output])
      end
    end
  when "response.failed", "response.incomplete"
    raise codex_sse_error(event, request_error_class: request_error_class)
  end
end

.reasoning_summary_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 193

def reasoning_summary_from_codex_items(items)
  items.flat_map do |item|
    next [] unless item.is_a?(Hash)

    if item["type"] == "reasoning" && item["summary"].is_a?(Array)
      item["summary"].filter_map { |part| part["text"] if part.is_a?(Hash) }
    else
      []
    end
  end.join
end

.text_from_codex_items(items) ⇒ Object 



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# File 'lib/kward/model/stream_parser.rb', line 179

def text_from_codex_items(items)
  items.flat_map do |item|
    next [] unless item.is_a?(Hash)

    if ["output_text", "text"].include?(item["type"])
      item["text"].to_s
    elsif item["type"] == "message" && item["content"].is_a?(Array)
      item["content"].filter_map { |part| part["text"] if part.is_a?(Hash) && ["output_text", "text"].include?(part["type"]) }
    else
      []
    end
  end.join
end