Class: DSPy::Observability

Inherits:
Object
  • Object
show all
Defined in:
lib/dspy/observability.rb,
lib/dspy/observability/async_span_processor.rb

Defined Under Namespace

Classes: AsyncSpanProcessor

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.enabled ⇒ Object (readonly)

Returns the value of attribute enabled.



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# File 'lib/dspy/observability.rb', line 9

def enabled
  @enabled
end

.endpoint ⇒ Object (readonly)

Returns the value of attribute endpoint.



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# File 'lib/dspy/observability.rb', line 9

def endpoint
  @endpoint
end

.tracer ⇒ Object (readonly)

Returns the value of attribute tracer.



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# File 'lib/dspy/observability.rb', line 9

def tracer
  @tracer
end

Class Method Details

.configure! ⇒ Object 



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# File 'lib/dspy/observability.rb', line 11

def configure!
  @enabled = false
  
  # Check for required Langfuse environment variables
  public_key = ENV['LANGFUSE_PUBLIC_KEY']
  secret_key = ENV['LANGFUSE_SECRET_KEY']
  
  unless public_key && secret_key
    return
  end

  # Determine endpoint based on host
  host = ENV['LANGFUSE_HOST'] || 'https://cloud.langfuse.com'
  @endpoint = "#{host}/api/public/otel/v1/traces"

  begin
    # Load OpenTelemetry gems
    require 'opentelemetry/sdk'
    require 'opentelemetry/exporter/otlp'

    # Generate Basic Auth header
    auth_string = Base64.strict_encode64("#{public_key}:#{secret_key}")
    
    # Configure OpenTelemetry SDK
    OpenTelemetry::SDK.configure do |config|
      config.service_name = 'dspy-ruby'
      config.service_version = DSPy::VERSION
      
      # Add OTLP exporter for Langfuse using AsyncSpanProcessor
      exporter = OpenTelemetry::Exporter::OTLP::Exporter.new(
        endpoint: @endpoint,
        headers: {
          'Authorization' => "Basic #{auth_string}",
          'Content-Type' => 'application/x-protobuf'
        },
        compression: 'gzip'
      )
      
      # Configure AsyncSpanProcessor with environment variables
      async_config = {
        queue_size: (ENV['DSPY_TELEMETRY_QUEUE_SIZE'] || AsyncSpanProcessor::DEFAULT_QUEUE_SIZE).to_i,
        export_interval: (ENV['DSPY_TELEMETRY_EXPORT_INTERVAL'] || AsyncSpanProcessor::DEFAULT_EXPORT_INTERVAL).to_f,
        export_batch_size: (ENV['DSPY_TELEMETRY_BATCH_SIZE'] || AsyncSpanProcessor::DEFAULT_EXPORT_BATCH_SIZE).to_i,
        shutdown_timeout: (ENV['DSPY_TELEMETRY_SHUTDOWN_TIMEOUT'] || AsyncSpanProcessor::DEFAULT_SHUTDOWN_TIMEOUT).to_f
      }
      
      config.add_span_processor(
        AsyncSpanProcessor.new(exporter, **async_config)
      )
      
      # Add resource attributes
      config.resource = OpenTelemetry::SDK::Resources::Resource.create({
        'service.name' => 'dspy-ruby',
        'service.version' => DSPy::VERSION,
        'telemetry.sdk.name' => 'opentelemetry',
        'telemetry.sdk.language' => 'ruby'
      })
    end

    # Create tracer
    @tracer = OpenTelemetry.tracer_provider.tracer('dspy', DSPy::VERSION)
    @enabled = true

  rescue LoadError => e
    DSPy.log('observability.disabled', reason: 'OpenTelemetry gems not available')
  rescue StandardError => e
    DSPy.log('observability.error', error: e.message, class: e.class.name)
  end
end

.enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dspy/observability.rb', line 81

def enabled?
  @enabled == true
end

.finish_span(span) ⇒ Object 



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# File 'lib/dspy/observability.rb', line 107

def finish_span(span)
  return unless span
  
  span.finish
rescue StandardError => e
  DSPy.log('observability.span_finish_error', error: e.message)
end

.flush! ⇒ Object 



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# File 'lib/dspy/observability.rb', line 115

def flush!
  return unless enabled?
  
  # Force flush any pending spans
  OpenTelemetry.tracer_provider.force_flush
rescue StandardError => e
  DSPy.log('observability.flush_error', error: e.message)
end

.reset! ⇒ Object 



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# File 'lib/dspy/observability.rb', line 124

def reset!
  @enabled = false
  @tracer = nil
  @endpoint = nil
end

.start_span(operation_name, attributes = {}) ⇒ Object 



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# File 'lib/dspy/observability.rb', line 89

def start_span(operation_name, attributes = {})
  return nil unless enabled? && tracer

  # Convert attribute keys to strings and filter out nil values
  string_attributes = attributes.transform_keys(&:to_s)
                               .reject { |k, v| v.nil? }
  string_attributes['operation.name'] = operation_name
  
  tracer.start_span(
    operation_name,
    kind: :internal,
    attributes: string_attributes
  )
rescue StandardError => e
  DSPy.log('observability.span_error', error: e.message, operation: operation_name)
  nil
end