Class: Datadog::Tracing::TraceOperation

Inherits:
Object
  • Object
show all
Includes:
Metadata::Tagging
Defined in:
lib/datadog/tracing/trace_operation.rb,
sig/datadog/tracing/trace_operation.rbs

Overview

Represents the act of tracing a series of operations, by generating and collecting span measurements. When completed, it yields a trace.

Supports synchronous code flow only. Usage across multiple threads will result in incorrect relationships. For async support, a TraceOperation should be employed per execution context (e.g. Thread, etc.)

Constant Summary collapse

DEFAULT_MAX_LENGTH =

Returns:

  • (::Integer) 
100_000
AUTO_SAMPLING_PRIORITIES =

Returns:

  • (::Array[::Integer]) 
[Sampling::Ext::Priority::AUTO_KEEP, Sampling::Ext::Priority::AUTO_REJECT].freeze
RECONSIDERABLE_DECISIONS =

Returns:

  • (::Array[::String]) 
[Sampling::Ext::Decision::DEFAULT, Sampling::Ext::Decision::AGENT_RATE].freeze

Constants included from Metadata::Tagging

Metadata::Tagging::ENSURE_AGENT_TAGS, Metadata::Tagging::NUMERIC_TAG_SIZE_RANGE

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Metadata::Tagging

#clear_metric, #clear_tag, #has_tag?, #meta, #metrics, #set_metric, #set_tag, #set_tags

Constructor Details

#initialize(logger: Datadog.logger, agent_sample_rate: nil, events: nil, hostname: nil, id: nil, max_length: DEFAULT_MAX_LENGTH, name: nil, origin: nil, parent_span_id: nil, rate_limiter_rate: nil, resource: nil, rule_sample_rate: nil, sample_rate: nil, sampled: nil, sampling_priority: nil, service: nil, profiling_enabled: nil, apm_tracing_enabled: nil, tags: nil, metrics: nil, trace_state: nil, trace_state_unknown_fields: nil, remote_parent: false, tracer: nil, baggage: nil, auto_finish: true) ⇒ Object

Creates a new TraceOperation.

Parameters:



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# File 'lib/datadog/tracing/trace_operation.rb', line 65

def initialize(
  logger: Datadog.logger,
  agent_sample_rate: nil,
  events: nil,
  hostname: nil,
  id: nil,
  max_length: DEFAULT_MAX_LENGTH,
  name: nil,
  origin: nil,
  parent_span_id: nil,
  rate_limiter_rate: nil,
  resource: nil,
  rule_sample_rate: nil,
  sample_rate: nil,
  sampled: nil,
  sampling_priority: nil,
  service: nil,
  profiling_enabled: nil,
  apm_tracing_enabled: nil,
  tags: nil,
  metrics: nil,
  trace_state: nil,
  trace_state_unknown_fields: nil,
  remote_parent: false,
  tracer: nil, # DEV-3.0: deprecated, remove in 3.0
  baggage: nil,
  auto_finish: true
)
  @logger = logger

  # Attributes
  @id = id || Tracing::Utils::TraceId.next_id
  @max_length = max_length || DEFAULT_MAX_LENGTH
  @parent_span_id = parent_span_id
  @sampled = sampled.nil? || sampled
  @remote_parent = remote_parent

  # Tags
  @agent_sample_rate = agent_sample_rate
  @hostname = hostname
  @name = name
  @origin = origin
  @rate_limiter_rate = rate_limiter_rate
  @resource = resource
  @rule_sample_rate = rule_sample_rate
  @sample_rate = sample_rate
  @sampling_priority = sampling_priority
  @service = service
  @profiling_enabled = profiling_enabled
  @apm_tracing_enabled = apm_tracing_enabled
  @trace_state = trace_state
  @trace_state_unknown_fields = trace_state_unknown_fields
  @baggage = baggage

  # Generic tags
  set_tags(tags) if tags
  set_tags(metrics) if metrics

  # State
  @root_span = nil
  @active_span = nil
  @active_span_count = 0
  @events = events || Events.new
  @finished = false
  @spans = []
  @auto_finish = !!auto_finish
  @flushed = false
  @propagated = false
end

Instance Attribute Details

#active_span ⇒ Object (readonly)

Returns the value of attribute active_span.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def active_span
  @active_span
end

#active_span_count ⇒ Object (readonly)

Returns the value of attribute active_span_count.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def active_span_count
  @active_span_count
end

#agent_sample_rate ⇒ Object

Returns the value of attribute agent_sample_rate.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def agent_sample_rate
  @agent_sample_rate
end

#baggage ⇒ Object

Returns the value of attribute baggage.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def baggage
  @baggage
end

#events ⇒ Object (readonly)

Returns the value of attribute events.



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# File 'lib/datadog/tracing/trace_operation.rb', line 530

def events
  @events
end

#hostname ⇒ Object

Returns the value of attribute hostname.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def hostname
  @hostname
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def id
  @id
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def logger
  @logger
end

#max_length ⇒ Object (readonly)

Returns the value of attribute max_length.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def max_length
  @max_length
end

#name ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 187

def name
  @name || root_span&.name
end

#origin ⇒ Object

Returns the value of attribute origin.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def origin
  @origin
end

#parent_span_id ⇒ Object (readonly)

Returns the value of attribute parent_span_id.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def parent_span_id
  @parent_span_id
end

#rate_limiter_rate ⇒ Object

Returns the value of attribute rate_limiter_rate.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def rate_limiter_rate
  @rate_limiter_rate
end

#remote_parent ⇒ Object

Returns the value of attribute remote_parent.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def remote_parent
  @remote_parent
end

#resource ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 191

def resource
  @resource || root_span&.resource
end

#root_span ⇒ Object (readonly)

Returns the value of attribute root_span.



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# File 'lib/datadog/tracing/trace_operation.rb', line 530

def root_span
  @root_span
end

#rule_sample_rate ⇒ Object

Returns the value of attribute rule_sample_rate.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def rule_sample_rate
  @rule_sample_rate
end

#sample_rate ⇒ Object

Returns the value of attribute sample_rate.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def sample_rate
  @sample_rate
end

#sampled=(value) ⇒ Object (writeonly)

Sets the attribute sampled

Parameters:

  • value —

    the value to set the attribute sampled to.



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# File 'lib/datadog/tracing/trace_operation.rb', line 54

def sampled=(value)
  @sampled = value
end

#sampling_priority ⇒ Object

Returns the value of attribute sampling_priority.



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# File 'lib/datadog/tracing/trace_operation.rb', line 33

def sampling_priority
  @sampling_priority
end

#service ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 231

def service
  @service || root_span&.service
end

#trace_state ⇒ Object (readonly)

Returns the value of attribute trace_state.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def trace_state
  @trace_state
end

#trace_state_unknown_fields ⇒ Object (readonly)

Returns the value of attribute trace_state_unknown_fields.



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# File 'lib/datadog/tracing/trace_operation.rb', line 44

def trace_state_unknown_fields
  @trace_state_unknown_fields
end

Instance Method Details

#activate_span!(span_op) ⇒ Object

Parameters:

  • span_op (Object)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 534

def activate_span!(span_op)
  parent = @active_span

  span_op.send(:parent=, parent) unless parent.nil?

  @active_span = span_op

  set_local_root_span!(span_op)
end

#before_finish_span(span_op) ⇒ Object

Parameters:

  • span_op (Object)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 564

def before_finish_span(span_op)
  # Publish :span_before_finish event
  events.span_before_finish.publish(span_op, self)
rescue => e
  logger.debug { "Error in before_finish_span on trace: #{e.class}: #{e.message} Backtrace: #{e.backtrace.first(3)}" }
end

#build_span(op_name, logger: Datadog.logger, events: nil, on_error: nil, resource: nil, service: nil, start_time: nil, tags: nil, type: nil, id: nil) ⇒ Object

Parameters:

  • op_name (Object)
  • events: (Object, nil) (defaults to: nil)
  • on_error: (on_error) (defaults to: nil)
  • resource: (Object, nil) (defaults to: nil)
  • service: (Object, nil) (defaults to: nil)
  • start_time: (Object, nil) (defaults to: nil)
  • tags: (Object, nil) (defaults to: nil)
  • type: (Object, nil) (defaults to: nil)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 274

def build_span(
  op_name,
  logger: Datadog.logger,
  events: nil,
  on_error: nil,
  resource: nil,
  service: nil,
  start_time: nil,
  tags: nil,
  type: nil,
  id: nil
)
  # Resolve span options:
  # Parent, service name, etc.
  # Add default options
  trace_id = @id
  parent = @active_span

  # Use active span's span ID if available. Otherwise, the parent span ID.
  # Necessary when this trace continues from another, e.g. distributed trace.
  parent_id = parent ? parent.id : @parent_span_id || 0

  # Build events
  span_events = events || SpanOperation::Events.new(logger: logger)

  # Before start: activate the span, publish events.
  span_events.before_start.subscribe do |span_op|
    start_span(span_op)
  end

  # Before finish: allow enrichment before the span is finalized, publish events.
  span_events.before_finish.subscribe do |span_op|
    before_finish_span(span_op)
  end

  # After finish: deactivate the span, record, publish events.
  span_events.after_finish.subscribe do |span, span_op|
    finish_span(span, span_op, parent)
  end

  # Build a new span operation
  SpanOperation.new(
    op_name,
    logger: logger,
    events: span_events,
    on_error: on_error,
    parent_id: parent_id,
    resource: resource || op_name,
    service: service,
    start_time: start_time,
    tags: tags,
    trace_id: trace_id,
    type: type,
    id: id
  )
rescue => e
  logger.debug { "Failed to build new span: #{e.class}: #{e.message}" }

  # Return dummy span
  SpanOperation.new(op_name, logger: logger)
end

#build_trace(spans, partial = false) ⇒ Object

Parameters:

  • spans (Object)
  • partial (Boolean) (defaults to: false)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 607

def build_trace(spans, partial = false)
  TraceSegment.new(
    spans,
    agent_sample_rate: @agent_sample_rate,
    hostname: @hostname,
    id: @id,
    lang: Core::Environment::Identity.lang,
    origin: @origin,
    process_id: Core::Environment::Identity.pid,
    rate_limiter_rate: @rate_limiter_rate,
    rule_sample_rate: @rule_sample_rate,
    runtime_id: Core::Environment::Identity.id,
    sample_rate: @sample_rate,
    sampling_priority: @sampling_priority,
    name: name,
    resource: resource,
    service: service,
    tags: meta,
    metrics: metrics,
    root_span_id: (!partial) ? root_span&.id : nil,
    profiling_enabled: @profiling_enabled,
    apm_tracing_enabled: @apm_tracing_enabled
  )
end

#deactivate_span!(span_op) ⇒ Object

Parameters:

  • span_op (Object)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 544

def deactivate_span!(span_op)
  # Set parent to closest unfinished ancestor span.
  # Prevents wrong span from being set as the active span
  # when spans finish out of order.
  span_op = span_op.send(:parent) while !span_op.nil? && span_op.finished?
  @active_span = span_op
end

#distributed_tags ⇒ Hash

Returns tracer tags that will be propagated if this span's context is exported through #to_digest.

Returns:

  • (Hash) —

    key value pairs of distributed tags



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# File 'lib/datadog/tracing/trace_operation.rb', line 635

def distributed_tags
  meta.select { |name, _| name.start_with?(Metadata::Ext::Distributed::TAGS_PREFIX) }
end

#finish_span(span, span_op, parent) ⇒ Object

For traces with automatic context management (auto_finish), when the local root span finishes, the trace also finishes. The trace cannot receive new spans after finished.

Without auto_finish, the trace can still receive spans until explicitly finished.



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# File 'lib/datadog/tracing/trace_operation.rb', line 577

def finish_span(span, span_op, parent)
  # Save finished span & root span
  @spans << span unless span.nil?

  # Deactivate the span, re-activate parent.
  deactivate_span!(span_op)

  # Finish if the local root span is finished and automatic
  # context management is enabled.
  @finished = true if span_op == root_span && @auto_finish

  # Update active span count
  @active_span_count -= 1

  # Publish :span_finished event
  events.span_finished.publish(span, self)

  # Publish :trace_finished event
  events.trace_finished.publish(self) if finished?
rescue => e
  logger.debug { "Error finishing span on trace: #{e.class}: #{e.message} Backtrace: #{e.backtrace.first(3)}" }
end

#finished? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 143

def finished?
  @finished == true
end

#finished_span_count ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 139

def finished_span_count
  @spans.length
end

#flush! {|spans| ... } ⇒ TraceSegment

Returns a Datadog::Tracing::TraceSegment with all finished spans that can be flushed at invocation time. All other finished spans are discarded.

Yields:

  • (spans) —

    spans that will be returned as part of the trace segment returned

Returns:



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# File 'lib/datadog/tracing/trace_operation.rb', line 341

def flush!
  finished = finished?

  # Copy out completed spans
  spans = @spans.dup
  @spans = []
  @flushed = true

  spans = yield(spans) if block_given?

  # Use them to build a trace
  build_trace(spans, !finished)
end

#fork_clone ⇒ Object

Returns a copy of this trace suitable for forks (w/o spans.) Used for continuation of traces across forks.



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# File 'lib/datadog/tracing/trace_operation.rb', line 427

def fork_clone
  self.class.new(
    agent_sample_rate: @agent_sample_rate,
    events: @events&.dup,
    hostname: @hostname&.dup,
    id: @id,
    max_length: @max_length,
    name: name&.dup,
    origin: @origin&.dup,
    parent_span_id: @active_span&.id || @parent_span_id,
    rate_limiter_rate: @rate_limiter_rate,
    resource: resource&.dup,
    rule_sample_rate: @rule_sample_rate,
    sample_rate: @sample_rate,
    sampled: @sampled,
    sampling_priority: @sampling_priority,
    service: service&.dup,
    trace_state: @trace_state&.dup,
    trace_state_unknown_fields: @trace_state_unknown_fields&.dup,
    tags: meta.dup,
    metrics: metrics.dup,
    remote_parent: @remote_parent
  )
end

#full? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 135

def full?
  @max_length > 0 && @active_span_count >= @max_length
end

#get_metric(key) ⇒ Object 



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# File 'lib/datadog/tracing/trace_operation.rb', line 200

def get_metric(key)
  super || root_span&.get_metric(key)
end

#get_tag(key) ⇒ Object

When retrieving tags or metrics we need to include root span tags for sampling purposes



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# File 'lib/datadog/tracing/trace_operation.rb', line 196

def get_tag(key)
  super || root_span&.get_tag(key)
end

#keep! ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 165

def keep!
  self.sampling_priority = Sampling::Ext::Priority::USER_KEEP
  set_tag(Tracing::Metadata::Ext::Distributed::TAG_DECISION_MAKER, Tracing::Sampling::Ext::Decision::MANUAL)
  self.sampled = true # Just in case the in-app sampler had decided to drop this span, we revert that decision.
end

#measure(op_name, logger: Datadog.logger, events: nil, on_error: nil, resource: nil, service: nil, start_time: nil, tags: nil, type: nil, id: nil) {|arg0, arg1| ... } ⇒ Object

Parameters:

  • op_name (Object)
  • events: (Object, nil) (defaults to: nil)
  • on_error: (on_error) (defaults to: nil)
  • resource: (Object, nil) (defaults to: nil)
  • service: (Object, nil) (defaults to: nil)
  • start_time: (Object, nil) (defaults to: nil)
  • tags: (Object, nil) (defaults to: nil)
  • type: (Object, nil) (defaults to: nil)

Yields:

Yield Parameters:

  • arg0 (Object)
  • arg1 (Object)

Yield Returns:

  • (Object)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 235

def measure(
  op_name,
  logger: Datadog.logger,
  events: nil,
  on_error: nil,
  resource: nil,
  service: nil,
  start_time: nil,
  tags: nil,
  type: nil,
  id: nil,
  &block
)
  # Don't allow more span measurements if the
  # trace is already completed. Prevents multiple
  # root spans with parent_span_id = 0.
  if finished? || full?
    return yield(
      SpanOperation.new(op_name, logger: logger),
      TraceOperation.new(logger: logger))
  end

  # Create new span
  span_op = build_span(
    op_name,
    events: events,
    on_error: on_error,
    resource: resource,
    service: service,
    start_time: start_time,
    tags: tags,
    type: type,
    id: id
  )

  # Start span measurement
  span_op.measure { |s| yield(s, self) }
end

#priority_sampled? ⇒ Boolean

Has the priority sampling chosen to keep this span?

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 161

def priority_sampled?
  !@sampling_priority.nil? && @sampling_priority > 0
end

#reconsider_resource_sample? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 225

def reconsider_resource_sample?
  return false if @resource.nil?

  reconsider_rule_sample?
end

#reject! ⇒ Object

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 171

def reject!
  self.sampling_priority = Sampling::Ext::Priority::USER_REJECT
  set_tag(Tracing::Metadata::Ext::Distributed::TAG_DECISION_MAKER, Tracing::Sampling::Ext::Decision::MANUAL)
end

#resource_override? ⇒ Boolean

Returns true if the resource has been explicitly set

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 221

def resource_override?
  !@resource.nil?
end

#sampled? ⇒ Boolean

Will this trace be flushed by the tracer transport? This includes cases where the span is kept solely due to priority sampling.

This is not the ultimate Datadog App sampling decision. Downstream systems can decide to reject this trace, especially for cases where priority sampling is set to AUTO_KEEP.

Returns:

  • (Boolean) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 155

def sampled?
  @sampled == true || priority_sampled?
end

#set_distributed_source(product_bit) ⇒ void

This method returns an undefined value.

Parameters:

  • product_bit (Integer) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 204

def set_distributed_source(product_bit)
  source = get_tag(Metadata::Ext::Distributed::TAG_TRACE_SOURCE)&.to_i(16) || 0
  source |= product_bit
  set_tag(Metadata::Ext::Distributed::TAG_TRACE_SOURCE, format('%02X', source))
end

#set_root_span! ⇒ nil, untyped

Parameters:

  • span (Object)

Returns:

  • (nil, untyped) 


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# File 'sig/datadog/tracing/trace_operation.rbs', line 109

def set_root_span!: (untyped span) -> (nil | untyped)

#start_span(span_op) ⇒ Object

Parameters:

  • span_op (Object)

Returns:

  • (Object) 


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# File 'lib/datadog/tracing/trace_operation.rb', line 552

def start_span(span_op)
  activate_span!(span_op)

  # Update active span count
  @active_span_count += 1

  # Publish :span_before_start event
  events.span_before_start.publish(span_op, self)
rescue => e
  logger.debug { "Error starting span on trace: #{e.class}: #{e.message} Backtrace: #{e.backtrace.first(3)}" }
end

#tags ⇒ Object 



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# File 'lib/datadog/tracing/trace_operation.rb', line 210

def tags
  all_tags = {}
  all_tags.merge!(root_span&.tags || {}) if root_span
  all_tags.merge!(super)

  all_tags
end

#to_correlation ⇒ Object 



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# File 'lib/datadog/tracing/trace_operation.rb', line 414

def to_correlation
  # Resolve current span ID
  span_id = @active_span&.id
  span_id ||= @parent_span_id unless finished?

  Correlation::Identifier.new(
    trace_id: @id,
    span_id: span_id
  )
end

#to_digest ⇒ Object

Returns a set of trace headers used for continuing traces. Used for propagation across execution contexts. Data should reflect the active state of the trace. DEV-3.0: Sampling is a side effect of generating the digest. We should move the sample call to inject and right before moving to new contexts(threads, forking etc.)



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# File 'lib/datadog/tracing/trace_operation.rb', line 383

def to_digest
  # Resolve current span ID
  span_id = @active_span&.id
  span_id ||= @parent_span_id unless finished?
  # sample the trace_operation with the tracer
  @propagated = true
  events.trace_propagated.publish(self)

  TraceDigest.new(
    span_id: span_id,
    span_name: @active_span && @active_span.name,
    span_resource: @active_span && @active_span.resource,
    span_service: @active_span && @active_span.service,
    span_type: @active_span && @active_span.type,
    trace_distributed_tags: distributed_tags,
    trace_hostname: @hostname,
    trace_id: @id,
    trace_name: name,
    trace_origin: @origin,
    trace_process_id: Core::Environment::Identity.pid,
    trace_resource: resource,
    trace_runtime_id: Core::Environment::Identity.id,
    trace_sampling_priority: @sampling_priority,
    trace_service: service,
    trace_state: @trace_state,
    trace_state_unknown_fields: @trace_state_unknown_fields,
    span_remote: @remote_parent && @active_span.nil?,
    baggage: (@baggage.nil? || @baggage.empty?) ? nil : @baggage
  ).freeze
end