Class: OpenTelemetry::Trace::Propagation::TraceContext::TextMapInjector

Inherits:
Object
  • Object
show all
Defined in:
lib/opentelemetry/trace/propagation/trace_context/text_map_injector.rb

Overview

Injects context into carriers using the W3C Trace Context format

Instance Method Summary collapse

Constructor Details

#initialize(default_setter = Context::Propagation.text_map_setter) ⇒ TextMapInjector

Returns a new TextMapInjector that injects context using the specified setter

Parameters:

  • default_setter (optional Setter) (defaults to: Context::Propagation.text_map_setter) —

    The default setter used to write context into a carrier during inject. Defaults to a TextMapSetter instance.



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# File 'lib/opentelemetry/trace/propagation/trace_context/text_map_injector.rb', line 19

def initialize(default_setter = Context::Propagation.text_map_setter)
  @default_setter = default_setter
end

Instance Method Details

#inject(carrier, context, setter = nil) ⇒ Object

Set the span context on the supplied carrier.

Parameters:

  • context (Context) —

    The active Context.

  • setter (optional Setter) (defaults to: nil) —

    If the optional setter is provided, it will be used to write context into the carrier, otherwise the default setter will be used.

Returns:

  • (Object) —

    the carrier with context injected



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# File 'lib/opentelemetry/trace/propagation/trace_context/text_map_injector.rb', line 30

def inject(carrier, context, setter = nil)
  return carrier unless (span_context = span_context_from(context))

  setter ||= @default_setter
  setter.set(carrier, TRACEPARENT_KEY, TraceParent.from_span_context(span_context).to_s)
  setter.set(carrier, TRACESTATE_KEY, span_context.tracestate.to_s) unless span_context.tracestate.empty?

  carrier
end