Class: Langfuse::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/langfuse/client.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(public_key: nil, secret_key: nil, host: nil, debug: false, timeout: 30, retries: 3, flush_interval: nil, auto_flush: nil) ⇒ Client

Returns a new instance of Client.

Raises:



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# File 'lib/langfuse/client.rb', line 14

def initialize(public_key: nil, secret_key: nil, host: nil, debug: false, timeout: 30, retries: 3,
               flush_interval: nil, auto_flush: nil)
  @public_key = public_key || ENV['LANGFUSE_PUBLIC_KEY'] || Langfuse.configuration.public_key
  @secret_key = secret_key || ENV['LANGFUSE_SECRET_KEY'] || Langfuse.configuration.secret_key
  @host = host || ENV['LANGFUSE_HOST'] || Langfuse.configuration.host
  @debug = debug || Langfuse.configuration.debug
  @timeout = timeout || Langfuse.configuration.timeout
  @retries = retries || Langfuse.configuration.retries
  @flush_interval = flush_interval || ENV['LANGFUSE_FLUSH_INTERVAL']&.to_i || Langfuse.configuration.flush_interval
  @auto_flush = if auto_flush.nil?
                  ENV['LANGFUSE_AUTO_FLUSH'] == 'false' ? false : Langfuse.configuration.auto_flush
                else
                  auto_flush
                end

  raise AuthenticationError, 'Public key is required' unless @public_key
  raise AuthenticationError, 'Secret key is required' unless @secret_key

  @connection = build_connection
  @event_queue = Concurrent::Array.new
  @flush_thread = start_flush_thread if @auto_flush
end

Instance Attribute Details

#auto_flush ⇒ Object (readonly)

Returns the value of attribute auto_flush.



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# File 'lib/langfuse/client.rb', line 12

def auto_flush
  @auto_flush
end

#debug ⇒ Object (readonly)

Returns the value of attribute debug.



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# File 'lib/langfuse/client.rb', line 12

def debug
  @debug
end

#flush_interval ⇒ Object (readonly)

Returns the value of attribute flush_interval.



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# File 'lib/langfuse/client.rb', line 12

def flush_interval
  @flush_interval
end

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/langfuse/client.rb', line 12

def host
  @host
end

#public_key ⇒ Object (readonly)

Returns the value of attribute public_key.



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# File 'lib/langfuse/client.rb', line 12

def public_key
  @public_key
end

#retries ⇒ Object (readonly)

Returns the value of attribute retries.



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# File 'lib/langfuse/client.rb', line 12

def retries
  @retries
end

#secret_key ⇒ Object (readonly)

Returns the value of attribute secret_key.



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# File 'lib/langfuse/client.rb', line 12

def secret_key
  @secret_key
end

#timeout ⇒ Object (readonly)

Returns the value of attribute timeout.



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# File 'lib/langfuse/client.rb', line 12

def timeout
  @timeout
end

Instance Method Details

#agent(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create an agent observation (wrapper around span with as_type: ‘agent’)



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# File 'lib/langfuse/client.rb', line 82

def agent(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
          metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
          version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::AGENT,
    **kwargs
  )
end

#chain(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create a chain observation (wrapper around span with as_type: ‘chain’)



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# File 'lib/langfuse/client.rb', line 124

def chain(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
          metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
          version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::CHAIN,
    **kwargs
  )
end

#create_prompt(name:, prompt:, labels: [], config: {}, **kwargs) ⇒ Object 



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# File 'lib/langfuse/client.rb', line 315

def create_prompt(name:, prompt:, labels: [], config: {}, **kwargs)
  data = {
    name: name,
    prompt: prompt,
    labels: labels,
    config: config,
    **kwargs
  }

  response = post('/api/public/v2/prompts', data)
  Prompt.new(response.body)
end

#embedding(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, model: nil, usage: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create an embedding observation (wrapper around span with as_type: ‘embedding’)



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# File 'lib/langfuse/client.rb', line 166

def embedding(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
              model: nil, usage: nil, metadata: nil, level: nil, status_message: nil,
              parent_observation_id: nil, version: nil, **kwargs)
  merged_metadata = (metadata || {}).merge(
    { model: model, usage: usage }.compact
  )
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: merged_metadata.empty? ? nil : merged_metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::EMBEDDING,
    **kwargs
  )
end

#enqueue_event(type, body) ⇒ Object

Event queue management



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# File 'lib/langfuse/client.rb', line 345

def enqueue_event(type, body)
  # 验证事件类型是否有效
  valid_types = %w[
    trace-create trace-update
    generation-create generation-update
    span-create span-update
    event-create
    score-create
  ]

  unless valid_types.include?(type)
    puts "Warning: Invalid event type '#{type}'. Skipping event." if @debug
    return
  end

  event = {
    id: Utils.generate_id,
    type: type,
    timestamp: Utils.current_timestamp,
    body: Utils.deep_stringify_keys(body)
  }

  if type == 'trace-update'
    # 查找对应的 trace-create 事件并更新
    trace_id = body['id'] || body[:id]
    if trace_id
      existing_event_index = @event_queue.find_index do |existing_event|
        existing_event[:type] == 'trace-create' &&
          (existing_event[:body]['id'] == trace_id || existing_event[:body][:id] == trace_id)
      end

      if existing_event_index
        # 更新现有的 trace-create 事件
        @event_queue[existing_event_index][:body].merge!(event[:body])
        @event_queue[existing_event_index][:timestamp] = event[:timestamp]
        puts "Updated existing trace-create event for trace_id: #{trace_id}" if @debug
      else
        # 如果没找到对应的 trace-create 事件，将 trace-update 转换为 trace-create
        event[:type] = 'trace-create'
        @event_queue << event
        puts "Converted trace-update to trace-create for trace_id: #{trace_id}" if @debug
      end
    elsif @debug
      puts 'Warning: trace-update event missing trace_id, skipping'
    end
  else
    @event_queue << event
  end
  puts "Enqueued event: #{type}" if @debug
end

#evaluator_obs(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create an evaluator observation (wrapper around span with as_type: ‘evaluator’)



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# File 'lib/langfuse/client.rb', line 190

def evaluator_obs(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
                  metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
                  version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::EVALUATOR,
    **kwargs
  )
end

#event(trace_id:, name:, start_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Event operations



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# File 'lib/langfuse/client.rb', line 258

def event(trace_id:, name:, start_time: nil, input: nil, output: nil, metadata: nil,
          level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs)
  Event.new(
    client: self,
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    **kwargs
  )
end

#flush ⇒ Object 



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# File 'lib/langfuse/client.rb', line 396

def flush
  return if @event_queue.empty?

  events = @event_queue.shift(@event_queue.length)
  return if events.empty?

  send_batch(events)
end

#generation(trace_id:, name: nil, start_time: nil, end_time: nil, completion_start_time: nil, model: nil, model_parameters: nil, input: nil, output: nil, usage: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Generation operations



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# File 'lib/langfuse/client.rb', line 232

def generation(trace_id:, name: nil, start_time: nil, end_time: nil, completion_start_time: nil,
               model: nil, model_parameters: nil, input: nil, output: nil, usage: nil,
               metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
               version: nil, **kwargs)
  Generation.new(
    client: self,
    trace_id: trace_id,
    name: name,
    start_time: start_time || Utils.current_timestamp,
    end_time: end_time,
    completion_start_time: completion_start_time,
    model: model,
    model_parameters: model_parameters,
    input: input,
    output: output,
    usage: usage,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    **kwargs
  )
end

#get_prompt(name, version: nil, label: nil, cache_ttl_seconds: 60) ⇒ Object

Prompt operations



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# File 'lib/langfuse/client.rb', line 277

def get_prompt(name, version: nil, label: nil, cache_ttl_seconds: 60)
  cache_key = "prompt:#{name}:#{version}:#{label}"

  if (cached_prompt = @prompt_cache&.dig(cache_key)) && (Time.now - cached_prompt[:cached_at] < cache_ttl_seconds)
    return cached_prompt[:prompt]
  end

  encoded_name = Utils.url_encode(name)
  path = "/api/public/v2/prompts/#{encoded_name}"
  params = {}
  params[:version] = version if version
  params[:label] = label if label

  puts "Making request to: #{@host}#{path} with params: #{params}" if @debug

  response = get(path, params)

  puts "Response status: #{response.status}" if @debug
  puts "Response headers: #{response.headers}" if @debug
  puts "Response body type: #{response.body.class}" if @debug

  # Check if response body is a string (HTML) instead of parsed JSON
  if response.body.is_a?(String) && response.body.include?('<!DOCTYPE html>')
    puts 'Received HTML response instead of JSON:' if @debug
    puts response.body[0..200] if @debug
    raise APIError,
          'Received HTML response instead of JSON. This usually indicates a 404 error or incorrect API endpoint.'
  end

  prompt = Prompt.new(response.body)

  # Cache the prompt
  @prompt_cache ||= {}
  @prompt_cache[cache_key] = { prompt: prompt, cached_at: Time.now }

  prompt
end

#guardrail(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create a guardrail observation (wrapper around span with as_type: ‘guardrail’)



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# File 'lib/langfuse/client.rb', line 211

def guardrail(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
              metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
              version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::GUARDRAIL,
    **kwargs
  )
end

#retriever(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create a retriever observation (wrapper around span with as_type: ‘retriever’)



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# File 'lib/langfuse/client.rb', line 145

def retriever(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
              metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
              version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::RETRIEVER,
    **kwargs
  )
end

#score(name:, value:, trace_id: nil, observation_id: nil, data_type: nil, comment: nil, **kwargs) ⇒ Object

Score/Evaluation operations



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# File 'lib/langfuse/client.rb', line 329

def score(name:, value:, trace_id: nil, observation_id: nil, data_type: nil, comment: nil, **kwargs)
  data = {
    name: name,
    value: value,
    data_type: data_type,
    comment: comment,
    **kwargs
  }

  data[:trace_id] = trace_id if trace_id
  data[:observation_id] = observation_id if observation_id

  enqueue_event('score-create', data)
end

#shutdown ⇒ Object 



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# File 'lib/langfuse/client.rb', line 405

def shutdown
  @flush_thread&.kill if @auto_flush
  flush unless @event_queue.empty?
end

#span(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, as_type: nil, **kwargs) ⇒ Object

Span operations



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# File 'lib/langfuse/client.rb', line 58

def span(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
         metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
         version: nil, as_type: nil, **kwargs)
  Span.new(
    client: self,
    trace_id: trace_id,
    name: name,
    start_time: start_time || Utils.current_timestamp,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: as_type,
    **kwargs
  )
end

#tool(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil, metadata: nil, level: nil, status_message: nil, parent_observation_id: nil, version: nil, **kwargs) ⇒ Object

Create a tool observation (wrapper around span with as_type: ‘tool’)



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# File 'lib/langfuse/client.rb', line 103

def tool(trace_id:, name: nil, start_time: nil, end_time: nil, input: nil, output: nil,
         metadata: nil, level: nil, status_message: nil, parent_observation_id: nil,
         version: nil, **kwargs)
  span(
    trace_id: trace_id,
    name: name,
    start_time: start_time,
    end_time: end_time,
    input: input,
    output: output,
    metadata: metadata,
    level: level,
    status_message: status_message,
    parent_observation_id: parent_observation_id,
    version: version,
    as_type: ObservationType::TOOL,
    **kwargs
  )
end

#trace(id: nil, name: nil, user_id: nil, session_id: nil, version: nil, release: nil, input: nil, output: nil, metadata: nil, tags: nil, timestamp: nil, **kwargs) ⇒ Object

Trace operations



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# File 'lib/langfuse/client.rb', line 38

def trace(id: nil, name: nil, user_id: nil, session_id: nil, version: nil, release: nil,
          input: nil, output: nil, metadata: nil, tags: nil, timestamp: nil, **kwargs)
  Trace.new(
    client: self,
    id: id || Utils.generate_id,
    name: name,
    user_id: user_id,
    session_id: session_id,
    version: version,
    release: release,
    input: input,
    output: output,
    metadata: metadata,
    tags: tags,
    timestamp: timestamp || Utils.current_timestamp,
    **kwargs
  )
end